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linux/drivers/input/touchscreen/atmel_mxt_ts.c
Gustavo A. R. Silva 03bf67817e Input: atmel_mxt_ts - mark expected switch fall-through 
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2018-10-15 11:24:11 -07:00

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/*
* Atmel maXTouch Touchscreen driver
*
* Copyright (C) 2010 Samsung Electronics Co.Ltd
* Copyright (C) 2011-2014 Atmel Corporation
* Copyright (C) 2012 Google, Inc.
* Copyright (C) 2016 Zodiac Inflight Innovations
*
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <asm/unaligned.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
/* Firmware files */
#define MXT_FW_NAME "maxtouch.fw"
#define MXT_CFG_NAME "maxtouch.cfg"
#define MXT_CFG_MAGIC "OBP_RAW V1"
/* Registers */
#define MXT_OBJECT_START 0x07
#define MXT_OBJECT_SIZE 6
#define MXT_INFO_CHECKSUM_SIZE 3
#define MXT_MAX_BLOCK_WRITE 256
/* Object types */
#define MXT_DEBUG_DIAGNOSTIC_T37 37
#define MXT_GEN_MESSAGE_T5 5
#define MXT_GEN_COMMAND_T6 6
#define MXT_GEN_POWER_T7 7
#define MXT_GEN_ACQUIRE_T8 8
#define MXT_GEN_DATASOURCE_T53 53
#define MXT_TOUCH_MULTI_T9 9
#define MXT_TOUCH_KEYARRAY_T15 15
#define MXT_TOUCH_PROXIMITY_T23 23
#define MXT_TOUCH_PROXKEY_T52 52
#define MXT_PROCI_GRIPFACE_T20 20
#define MXT_PROCG_NOISE_T22 22
#define MXT_PROCI_ONETOUCH_T24 24
#define MXT_PROCI_TWOTOUCH_T27 27
#define MXT_PROCI_GRIP_T40 40
#define MXT_PROCI_PALM_T41 41
#define MXT_PROCI_TOUCHSUPPRESSION_T42 42
#define MXT_PROCI_STYLUS_T47 47
#define MXT_PROCG_NOISESUPPRESSION_T48 48
#define MXT_SPT_COMMSCONFIG_T18 18
#define MXT_SPT_GPIOPWM_T19 19
#define MXT_SPT_SELFTEST_T25 25
#define MXT_SPT_CTECONFIG_T28 28
#define MXT_SPT_USERDATA_T38 38
#define MXT_SPT_DIGITIZER_T43 43
#define MXT_SPT_MESSAGECOUNT_T44 44
#define MXT_SPT_CTECONFIG_T46 46
#define MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71 71
#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
/* MXT_GEN_MESSAGE_T5 object */
#define MXT_RPTID_NOMSG 0xff
/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET 0
#define MXT_COMMAND_BACKUPNV 1
#define MXT_COMMAND_CALIBRATE 2
#define MXT_COMMAND_REPORTALL 3
#define MXT_COMMAND_DIAGNOSTIC 5
/* Define for T6 status byte */
#define MXT_T6_STATUS_RESET BIT(7)
#define MXT_T6_STATUS_OFL BIT(6)
#define MXT_T6_STATUS_SIGERR BIT(5)
#define MXT_T6_STATUS_CAL BIT(4)
#define MXT_T6_STATUS_CFGERR BIT(3)
#define MXT_T6_STATUS_COMSERR BIT(2)
/* MXT_GEN_POWER_T7 field */
struct t7_config {
u8 idle;
u8 active;
} __packed;
#define MXT_POWER_CFG_RUN 0
#define MXT_POWER_CFG_DEEPSLEEP 1
/* MXT_TOUCH_MULTI_T9 field */
#define MXT_T9_CTRL 0
#define MXT_T9_XSIZE 3
#define MXT_T9_YSIZE 4
#define MXT_T9_ORIENT 9
#define MXT_T9_RANGE 18
/* MXT_TOUCH_MULTI_T9 status */
#define MXT_T9_UNGRIP BIT(0)
#define MXT_T9_SUPPRESS BIT(1)
#define MXT_T9_AMP BIT(2)
#define MXT_T9_VECTOR BIT(3)
#define MXT_T9_MOVE BIT(4)
#define MXT_T9_RELEASE BIT(5)
#define MXT_T9_PRESS BIT(6)
#define MXT_T9_DETECT BIT(7)
struct t9_range {
__le16 x;
__le16 y;
} __packed;
/* MXT_TOUCH_MULTI_T9 orient */
#define MXT_T9_ORIENT_SWITCH BIT(0)
#define MXT_T9_ORIENT_INVERTX BIT(1)
#define MXT_T9_ORIENT_INVERTY BIT(2)
/* MXT_SPT_COMMSCONFIG_T18 */
#define MXT_COMMS_CTRL 0
#define MXT_COMMS_CMD 1
/* MXT_DEBUG_DIAGNOSTIC_T37 */
#define MXT_DIAGNOSTIC_PAGEUP 0x01
#define MXT_DIAGNOSTIC_DELTAS 0x10
#define MXT_DIAGNOSTIC_REFS 0x11
#define MXT_DIAGNOSTIC_SIZE 128
#define MXT_FAMILY_1386 160
#define MXT1386_COLUMNS 3
#define MXT1386_PAGES_PER_COLUMN 8
struct t37_debug {
#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
u8 mode;
u8 page;
u8 data[MXT_DIAGNOSTIC_SIZE];
#endif
};
/* Define for MXT_GEN_COMMAND_T6 */
#define MXT_BOOT_VALUE 0xa5
#define MXT_RESET_VALUE 0x01
#define MXT_BACKUP_VALUE 0x55
/* T100 Multiple Touch Touchscreen */
#define MXT_T100_CTRL 0
#define MXT_T100_CFG1 1
#define MXT_T100_TCHAUX 3
#define MXT_T100_XSIZE 9
#define MXT_T100_XRANGE 13
#define MXT_T100_YSIZE 20
#define MXT_T100_YRANGE 24
#define MXT_T100_CFG_SWITCHXY BIT(5)
#define MXT_T100_CFG_INVERTY BIT(6)
#define MXT_T100_CFG_INVERTX BIT(7)
#define MXT_T100_TCHAUX_VECT BIT(0)
#define MXT_T100_TCHAUX_AMPL BIT(1)
#define MXT_T100_TCHAUX_AREA BIT(2)
#define MXT_T100_DETECT BIT(7)
#define MXT_T100_TYPE_MASK 0x70
enum t100_type {
MXT_T100_TYPE_FINGER = 1,
MXT_T100_TYPE_PASSIVE_STYLUS = 2,
MXT_T100_TYPE_HOVERING_FINGER = 4,
MXT_T100_TYPE_GLOVE = 5,
MXT_T100_TYPE_LARGE_TOUCH = 6,
};
#define MXT_DISTANCE_ACTIVE_TOUCH 0
#define MXT_DISTANCE_HOVERING 1
#define MXT_TOUCH_MAJOR_DEFAULT 1
#define MXT_PRESSURE_DEFAULT 1
/* Delay times */
#define MXT_BACKUP_TIME 50 /* msec */
#define MXT_RESET_GPIO_TIME 20 /* msec */
#define MXT_RESET_INVALID_CHG 100 /* msec */
#define MXT_RESET_TIME 200 /* msec */
#define MXT_RESET_TIMEOUT 3000 /* msec */
#define MXT_CRC_TIMEOUT 1000 /* msec */
#define MXT_FW_RESET_TIME 3000 /* msec */
#define MXT_FW_CHG_TIMEOUT 300 /* msec */
/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB 0xaa
#define MXT_UNLOCK_CMD_LSB 0xdc
/* Bootloader mode status */
#define MXT_WAITING_BOOTLOAD_CMD 0xc0 /* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA 0x80 /* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK 0x02
#define MXT_FRAME_CRC_FAIL 0x03
#define MXT_FRAME_CRC_PASS 0x04
#define MXT_APP_CRC_FAIL 0x40 /* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK 0x3f
#define MXT_BOOT_EXTENDED_ID BIT(5)
#define MXT_BOOT_ID_MASK 0x1f
/* Touchscreen absolute values */
#define MXT_MAX_AREA 0xff
#define MXT_PIXELS_PER_MM 20
struct mxt_info {
u8 family_id;
u8 variant_id;
u8 version;
u8 build;
u8 matrix_xsize;
u8 matrix_ysize;
u8 object_num;
};
struct mxt_object {
u8 type;
u16 start_address;
u8 size_minus_one;
u8 instances_minus_one;
u8 num_report_ids;
} __packed;
struct mxt_dbg {
u16 t37_address;
u16 diag_cmd_address;
struct t37_debug *t37_buf;
unsigned int t37_pages;
unsigned int t37_nodes;
struct v4l2_device v4l2;
struct v4l2_pix_format format;
struct video_device vdev;
struct vb2_queue queue;
struct mutex lock;
int input;
};
enum v4l_dbg_inputs {
MXT_V4L_INPUT_DELTAS,
MXT_V4L_INPUT_REFS,
MXT_V4L_INPUT_MAX,
};
static const struct v4l2_file_operations mxt_video_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.unlocked_ioctl = video_ioctl2,
.read = vb2_fop_read,
.mmap = vb2_fop_mmap,
.poll = vb2_fop_poll,
};
enum mxt_suspend_mode {
MXT_SUSPEND_DEEP_SLEEP = 0,
MXT_SUSPEND_T9_CTRL = 1,
};
/* Config update context */
struct mxt_cfg {
u8 *raw;
size_t raw_size;
off_t raw_pos;
u8 *mem;
size_t mem_size;
int start_ofs;
struct mxt_info info;
};
/* Each client has this additional data */
struct mxt_data {
struct i2c_client *client;
struct input_dev *input_dev;
char phys[64]; /* device physical location */
struct mxt_object *object_table;
struct mxt_info *info;
void *raw_info_block;
unsigned int irq;
unsigned int max_x;
unsigned int max_y;
bool invertx;
bool inverty;
bool xy_switch;
u8 xsize;
u8 ysize;
bool in_bootloader;
u16 mem_size;
u8 t100_aux_ampl;
u8 t100_aux_area;
u8 t100_aux_vect;
u8 max_reportid;
u32 config_crc;
u32 info_crc;
u8 bootloader_addr;
u8 *msg_buf;
u8 t6_status;
bool update_input;
u8 last_message_count;
u8 num_touchids;
u8 multitouch;
struct t7_config t7_cfg;
struct mxt_dbg dbg;
struct gpio_desc *reset_gpio;
/* Cached parameters from object table */
u16 T5_address;
u8 T5_msg_size;
u8 T6_reportid;
u16 T6_address;
u16 T7_address;
u16 T71_address;
u8 T9_reportid_min;
u8 T9_reportid_max;
u8 T19_reportid;
u16 T44_address;
u8 T100_reportid_min;
u8 T100_reportid_max;
/* for fw update in bootloader */
struct completion bl_completion;
/* for reset handling */
struct completion reset_completion;
/* for config update handling */
struct completion crc_completion;
u32 *t19_keymap;
unsigned int t19_num_keys;
enum mxt_suspend_mode suspend_mode;
};
struct mxt_vb2_buffer {
struct vb2_buffer vb;
struct list_head list;
};
static size_t mxt_obj_size(const struct mxt_object *obj)
{
return obj->size_minus_one + 1;
}
static size_t mxt_obj_instances(const struct mxt_object *obj)
{
return obj->instances_minus_one + 1;
}
static bool mxt_object_readable(unsigned int type)
{
switch (type) {
case MXT_GEN_COMMAND_T6:
case MXT_GEN_POWER_T7:
case MXT_GEN_ACQUIRE_T8:
case MXT_GEN_DATASOURCE_T53:
case MXT_TOUCH_MULTI_T9:
case MXT_TOUCH_KEYARRAY_T15:
case MXT_TOUCH_PROXIMITY_T23:
case MXT_TOUCH_PROXKEY_T52:
case MXT_TOUCH_MULTITOUCHSCREEN_T100:
case MXT_PROCI_GRIPFACE_T20:
case MXT_PROCG_NOISE_T22:
case MXT_PROCI_ONETOUCH_T24:
case MXT_PROCI_TWOTOUCH_T27:
case MXT_PROCI_GRIP_T40:
case MXT_PROCI_PALM_T41:
case MXT_PROCI_TOUCHSUPPRESSION_T42:
case MXT_PROCI_STYLUS_T47:
case MXT_PROCG_NOISESUPPRESSION_T48:
case MXT_SPT_COMMSCONFIG_T18:
case MXT_SPT_GPIOPWM_T19:
case MXT_SPT_SELFTEST_T25:
case MXT_SPT_CTECONFIG_T28:
case MXT_SPT_USERDATA_T38:
case MXT_SPT_DIGITIZER_T43:
case MXT_SPT_CTECONFIG_T46:
case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
return true;
default:
return false;
}
}
static void mxt_dump_message(struct mxt_data *data, u8 *message)
{
dev_dbg(&data->client->dev, "message: %*ph\n",
data->T5_msg_size, message);
}
static int mxt_wait_for_completion(struct mxt_data *data,
struct completion *comp,
unsigned int timeout_ms)
{
struct device *dev = &data->client->dev;
unsigned long timeout = msecs_to_jiffies(timeout_ms);
long ret;
ret = wait_for_completion_interruptible_timeout(comp, timeout);
if (ret < 0) {
return ret;
} else if (ret == 0) {
dev_err(dev, "Wait for completion timed out.\n");
return -ETIMEDOUT;
}
return 0;
}
static int mxt_bootloader_read(struct mxt_data *data,
u8 *val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.flags |= I2C_M_RD;
msg.len = count;
msg.buf = val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_bootloader_write(struct mxt_data *data,
const u8 * const val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.len = count;
msg.buf = (u8 *)val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
{
u8 appmode = data->client->addr;
u8 bootloader;
u8 family_id = data->info ? data->info->family_id : 0;
switch (appmode) {
case 0x4a:
case 0x4b:
/* Chips after 1664S use different scheme */
if (retry || family_id >= 0xa2) {
bootloader = appmode - 0x24;
break;
}
/* Fall through - for normal case */
case 0x4c:
case 0x4d:
case 0x5a:
case 0x5b:
bootloader = appmode - 0x26;
break;
default:
dev_err(&data->client->dev,
"Appmode i2c address 0x%02x not found\n",
appmode);
return -EINVAL;
}
data->bootloader_addr = bootloader;
return 0;
}
static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
{
struct device *dev = &data->client->dev;
int error;
u8 val;
bool crc_failure;
error = mxt_lookup_bootloader_address(data, alt_address);
if (error)
return error;
error = mxt_bootloader_read(data, &val, 1);
if (error)
return error;
/* Check app crc fail mode */
crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
dev_err(dev, "Detected bootloader, status:%02X%s\n",
val, crc_failure ? ", APP_CRC_FAIL" : "");
return 0;
}
static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
{
struct device *dev = &data->client->dev;
u8 buf[3];
if (val & MXT_BOOT_EXTENDED_ID) {
if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
dev_err(dev, "%s: i2c failure\n", __func__);
return val;
}
dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
return buf[0];
} else {
dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
return val;
}
}
static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
bool wait)
{
struct device *dev = &data->client->dev;
u8 val;
int ret;
recheck:
if (wait) {
/*
* In application update mode, the interrupt
* line signals state transitions. We must wait for the
* CHG assertion before reading the status byte.
* Once the status byte has been read, the line is deasserted.
*/
ret = mxt_wait_for_completion(data, &data->bl_completion,
MXT_FW_CHG_TIMEOUT);
if (ret) {
/*
* TODO: handle -ERESTARTSYS better by terminating
* fw update process before returning to userspace
* by writing length 0x000 to device (iff we are in
* WAITING_FRAME_DATA state).
*/
dev_err(dev, "Update wait error %d\n", ret);
return ret;
}
}
ret = mxt_bootloader_read(data, &val, 1);
if (ret)
return ret;
if (state == MXT_WAITING_BOOTLOAD_CMD)
val = mxt_get_bootloader_version(data, val);
switch (state) {
case MXT_WAITING_BOOTLOAD_CMD:
case MXT_WAITING_FRAME_DATA:
case MXT_APP_CRC_FAIL:
val &= ~MXT_BOOT_STATUS_MASK;
break;
case MXT_FRAME_CRC_PASS:
if (val == MXT_FRAME_CRC_CHECK) {
goto recheck;
} else if (val == MXT_FRAME_CRC_FAIL) {
dev_err(dev, "Bootloader CRC fail\n");
return -EINVAL;
}
break;
default:
return -EINVAL;
}
if (val != state) {
dev_err(dev, "Invalid bootloader state %02X != %02X\n",
val, state);
return -EINVAL;
}
return 0;
}
static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
{
int ret;
u8 buf[2];
if (unlock) {
buf[0] = MXT_UNLOCK_CMD_LSB;
buf[1] = MXT_UNLOCK_CMD_MSB;
} else {
buf[0] = 0x01;
buf[1] = 0x01;
}
ret = mxt_bootloader_write(data, buf, 2);
if (ret)
return ret;
return 0;
}
static int __mxt_read_reg(struct i2c_client *client,
u16 reg, u16 len, void *val)
{
struct i2c_msg xfer[2];
u8 buf[2];
int ret;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 2;
xfer[0].buf = buf;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = len;
xfer[1].buf = val;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret == 2) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
__func__, ret);
}
return ret;
}
static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
const void *val)
{
u8 *buf;
size_t count;
int ret;
count = len + 2;
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
memcpy(&buf[2], val, len);
ret = i2c_master_send(client, buf, count);
if (ret == count) {
ret = 0;
} else {
if (ret >= 0)
ret = -EIO;
dev_err(&client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
kfree(buf);
return ret;
}
static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
return __mxt_write_reg(client, reg, 1, &val);
}
static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
{
struct mxt_object *object;
int i;
for (i = 0; i < data->info->object_num; i++) {
object = data->object_table + i;
if (object->type == type)
return object;
}
dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
return NULL;
}
static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
if (crc != data->config_crc) {
data->config_crc = crc;
dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
}
complete(&data->crc_completion);
/* Detect reset */
if (status & MXT_T6_STATUS_RESET)
complete(&data->reset_completion);
/* Output debug if status has changed */
if (status != data->t6_status)
dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
status,
status == 0 ? " OK" : "",
status & MXT_T6_STATUS_RESET ? " RESET" : "",
status & MXT_T6_STATUS_OFL ? " OFL" : "",
status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
status & MXT_T6_STATUS_CAL ? " CAL" : "",
status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
/* Save current status */
data->t6_status = status;
}
static int mxt_write_object(struct mxt_data *data,
u8 type, u8 offset, u8 val)
{
struct mxt_object *object;
u16 reg;
object = mxt_get_object(data, type);
if (!object || offset >= mxt_obj_size(object))
return -EINVAL;
reg = object->start_address;
return mxt_write_reg(data->client, reg + offset, val);
}
static void mxt_input_button(struct mxt_data *data, u8 *message)
{
struct input_dev *input = data->input_dev;
int i;
for (i = 0; i < data->t19_num_keys; i++) {
if (data->t19_keymap[i] == KEY_RESERVED)
continue;
/* Active-low switch */
input_report_key(input, data->t19_keymap[i],
!(message[1] & BIT(i)));
}
}
static void mxt_input_sync(struct mxt_data *data)
{
input_mt_report_pointer_emulation(data->input_dev,
data->t19_num_keys);
input_sync(data->input_dev);
}
static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev = data->input_dev;
int id;
u8 status;
int x;
int y;
int area;
int amplitude;
id = message[0] - data->T9_reportid_min;
status = message[1];
x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
y = (message[3] << 4) | ((message[4] & 0xf));
/* Handle 10/12 bit switching */
if (data->max_x < 1024)
x >>= 2;
if (data->max_y < 1024)
y >>= 2;
area = message[5];
amplitude = message[6];
dev_dbg(dev,
"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
id,
(status & MXT_T9_DETECT) ? 'D' : '.',
(status & MXT_T9_PRESS) ? 'P' : '.',
(status & MXT_T9_RELEASE) ? 'R' : '.',
(status & MXT_T9_MOVE) ? 'M' : '.',
(status & MXT_T9_VECTOR) ? 'V' : '.',
(status & MXT_T9_AMP) ? 'A' : '.',
(status & MXT_T9_SUPPRESS) ? 'S' : '.',
(status & MXT_T9_UNGRIP) ? 'U' : '.',
x, y, area, amplitude);
input_mt_slot(input_dev, id);
if (status & MXT_T9_DETECT) {
/*
* Multiple bits may be set if the host is slow to read
* the status messages, indicating all the events that
* have happened.
*/
if (status & MXT_T9_RELEASE) {
input_mt_report_slot_state(input_dev,
MT_TOOL_FINGER, 0);
mxt_input_sync(data);
}
/* if active, pressure must be non-zero */
if (!amplitude)
amplitude = MXT_PRESSURE_DEFAULT;
/* Touch active */
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
} else {
/* Touch no longer active, close out slot */
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
}
data->update_input = true;
}
static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev = data->input_dev;
int id;
u8 status;
u8 type = 0;
u16 x;
u16 y;
int distance = 0;
int tool = 0;
u8 major = 0;
u8 pressure = 0;
u8 orientation = 0;
id = message[0] - data->T100_reportid_min - 2;
/* ignore SCRSTATUS events */
if (id < 0)
return;
status = message[1];
x = get_unaligned_le16(&message[2]);
y = get_unaligned_le16(&message[4]);
if (status & MXT_T100_DETECT) {
type = (status & MXT_T100_TYPE_MASK) >> 4;
switch (type) {
case MXT_T100_TYPE_HOVERING_FINGER:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_HOVERING;
if (data->t100_aux_vect)
orientation = message[data->t100_aux_vect];
break;
case MXT_T100_TYPE_FINGER:
case MXT_T100_TYPE_GLOVE:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_ACTIVE_TOUCH;
if (data->t100_aux_area)
major = message[data->t100_aux_area];
if (data->t100_aux_ampl)
pressure = message[data->t100_aux_ampl];
if (data->t100_aux_vect)
orientation = message[data->t100_aux_vect];
break;
case MXT_T100_TYPE_PASSIVE_STYLUS:
tool = MT_TOOL_PEN;
/*
* Passive stylus is reported with size zero so
* hardcode.
*/
major = MXT_TOUCH_MAJOR_DEFAULT;
if (data->t100_aux_ampl)
pressure = message[data->t100_aux_ampl];
break;
case MXT_T100_TYPE_LARGE_TOUCH:
/* Ignore suppressed touch */
break;
default:
dev_dbg(dev, "Unexpected T100 type\n");
return;
}
}
/*
* Values reported should be non-zero if tool is touching the
* device
*/
if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
pressure = MXT_PRESSURE_DEFAULT;
input_mt_slot(input_dev, id);
if (status & MXT_T100_DETECT) {
dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
id, type, x, y, major, pressure, orientation);
input_mt_report_slot_state(input_dev, tool, 1);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, major);
input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
} else {
dev_dbg(dev, "[%u] release\n", id);
/* close out slot */
input_mt_report_slot_state(input_dev, 0, 0);
}
data->update_input = true;
}
static int mxt_proc_message(struct mxt_data *data, u8 *message)
{
u8 report_id = message[0];
if (report_id == MXT_RPTID_NOMSG)
return 0;
if (report_id == data->T6_reportid) {
mxt_proc_t6_messages(data, message);
} else if (!data->input_dev) {
/*
* Do not report events if input device
* is not yet registered.
*/
mxt_dump_message(data, message);
} else if (report_id >= data->T9_reportid_min &&
report_id <= data->T9_reportid_max) {
mxt_proc_t9_message(data, message);
} else if (report_id >= data->T100_reportid_min &&
report_id <= data->T100_reportid_max) {
mxt_proc_t100_message(data, message);
} else if (report_id == data->T19_reportid) {
mxt_input_button(data, message);
data->update_input = true;
} else {
mxt_dump_message(data, message);
}
return 1;
}
static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
{
struct device *dev = &data->client->dev;
int ret;
int i;
u8 num_valid = 0;
/* Safety check for msg_buf */
if (count > data->max_reportid)
return -EINVAL;
/* Process remaining messages if necessary */
ret = __mxt_read_reg(data->client, data->T5_address,
data->T5_msg_size * count, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
return ret;
}
for (i = 0; i < count; i++) {
ret = mxt_proc_message(data,
data->msg_buf + data->T5_msg_size * i);
if (ret == 1)
num_valid++;
}
/* return number of messages read */
return num_valid;
}
static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret;
u8 count, num_left;
/* Read T44 and T5 together */
ret = __mxt_read_reg(data->client, data->T44_address,
data->T5_msg_size + 1, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
return IRQ_NONE;
}
count = data->msg_buf[0];
/*
* This condition may be caused by the CHG line being configured in
* Mode 0. It results in unnecessary I2C operations but it is benign.
*/
if (count == 0)
return IRQ_NONE;
if (count > data->max_reportid) {
dev_warn(dev, "T44 count %d exceeded max report id\n", count);
count = data->max_reportid;
}
/* Process first message */
ret = mxt_proc_message(data, data->msg_buf + 1);
if (ret < 0) {
dev_warn(dev, "Unexpected invalid message\n");
return IRQ_NONE;
}
num_left = count - 1;
/* Process remaining messages if necessary */
if (num_left) {
ret = mxt_read_and_process_messages(data, num_left);
if (ret < 0)
goto end;
else if (ret != num_left)
dev_warn(dev, "Unexpected invalid message\n");
}
end:
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static int mxt_process_messages_until_invalid(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int count, read;
u8 tries = 2;
count = data->max_reportid;
/* Read messages until we force an invalid */
do {
read = mxt_read_and_process_messages(data, count);
if (read < count)
return 0;
} while (--tries);
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
dev_err(dev, "CHG pin isn't cleared\n");
return -EBUSY;
}
static irqreturn_t mxt_process_messages(struct mxt_data *data)
{
int total_handled, num_handled;
u8 count = data->last_message_count;
if (count < 1 || count > data->max_reportid)
count = 1;
/* include final invalid message */
total_handled = mxt_read_and_process_messages(data, count + 1);
if (total_handled < 0)
return IRQ_NONE;
/* if there were invalid messages, then we are done */
else if (total_handled <= count)
goto update_count;
/* keep reading two msgs until one is invalid or reportid limit */
do {
num_handled = mxt_read_and_process_messages(data, 2);
if (num_handled < 0)
return IRQ_NONE;
total_handled += num_handled;
if (num_handled < 2)
break;
} while (total_handled < data->num_touchids);
update_count:
data->last_message_count = total_handled;
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
struct mxt_data *data = dev_id;
if (data->in_bootloader) {
/* bootloader state transition completion */
complete(&data->bl_completion);
return IRQ_HANDLED;
}
if (!data->object_table)
return IRQ_HANDLED;
if (data->T44_address) {
return mxt_process_messages_t44(data);
} else {
return mxt_process_messages(data);
}
}
static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
u8 value, bool wait)
{
u16 reg;
u8 command_register;
int timeout_counter = 0;
int ret;
reg = data->T6_address + cmd_offset;
ret = mxt_write_reg(data->client, reg, value);
if (ret)
return ret;
if (!wait)
return 0;
do {
msleep(20);
ret = __mxt_read_reg(data->client, reg, 1, &command_register);
if (ret)
return ret;
} while (command_register != 0 && timeout_counter++ <= 100);
if (timeout_counter > 100) {
dev_err(&data->client->dev, "Command failed!\n");
return -EIO;
}
return 0;
}
static int mxt_acquire_irq(struct mxt_data *data)
{
int error;
enable_irq(data->irq);
error = mxt_process_messages_until_invalid(data);
if (error)
return error;
return 0;
}
static int mxt_soft_reset(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret = 0;
dev_info(dev, "Resetting device\n");
disable_irq(data->irq);
reinit_completion(&data->reset_completion);
ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
if (ret)
return ret;
/* Ignore CHG line for 100ms after reset */
msleep(MXT_RESET_INVALID_CHG);
mxt_acquire_irq(data);
ret = mxt_wait_for_completion(data, &data->reset_completion,
MXT_RESET_TIMEOUT);
if (ret)
return ret;
return 0;
}
static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
{
/*
* On failure, CRC is set to 0 and config will always be
* downloaded.
*/
data->config_crc = 0;
reinit_completion(&data->crc_completion);
mxt_t6_command(data, cmd, value, true);
/*
* Wait for crc message. On failure, CRC is set to 0 and config will
* always be downloaded.
*/
mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
}
static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
{
static const unsigned int crcpoly = 0x80001B;
u32 result;
u32 data_word;
data_word = (secondbyte << 8) | firstbyte;
result = ((*crc << 1) ^ data_word);
if (result & 0x1000000)
result ^= crcpoly;
*crc = result;
}
static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
{
u32 crc = 0;
u8 *ptr = base + start_off;
u8 *last_val = base + end_off - 1;
if (end_off < start_off)
return -EINVAL;
while (ptr < last_val) {
mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
ptr += 2;
}
/* if len is odd, fill the last byte with 0 */
if (ptr == last_val)
mxt_calc_crc24(&crc, *ptr, 0);
/* Mask to 24-bit */
crc &= 0x00FFFFFF;
return crc;
}
static int mxt_prepare_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
{
struct device *dev = &data->client->dev;
struct mxt_object *object;
unsigned int type, instance, size, byte_offset;
int offset;
int ret;
int i;
u16 reg;
u8 val;
while (cfg->raw_pos < cfg->raw_size) {
/* Read type, instance, length */
ret = sscanf(cfg->raw + cfg->raw_pos, "%x %x %x%n",
&type, &instance, &size, &offset);
if (ret == 0) {
/* EOF */
break;
} else if (ret != 3) {
dev_err(dev, "Bad format: failed to parse object\n");
return -EINVAL;
}
cfg->raw_pos += offset;
object = mxt_get_object(data, type);
if (!object) {
/* Skip object */
for (i = 0; i < size; i++) {
ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
&val, &offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
cfg->raw_pos += offset;
}
continue;
}
if (size > mxt_obj_size(object)) {
/*
* Either we are in fallback mode due to wrong
* config or config from a later fw version,
* or the file is corrupt or hand-edited.
*/
dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
size - mxt_obj_size(object), type);
} else if (mxt_obj_size(object) > size) {
/*
* If firmware is upgraded, new bytes may be added to
* end of objects. It is generally forward compatible
* to zero these bytes - previous behaviour will be
* retained. However this does invalidate the CRC and
* will force fallback mode until the configuration is
* updated. We warn here but do nothing else - the
* malloc has zeroed the entire configuration.
*/
dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
mxt_obj_size(object) - size, type);
}
if (instance >= mxt_obj_instances(object)) {
dev_err(dev, "Object instances exceeded!\n");
return -EINVAL;
}
reg = object->start_address + mxt_obj_size(object) * instance;
for (i = 0; i < size; i++) {
ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
&val,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
cfg->raw_pos += offset;
if (i > mxt_obj_size(object))
continue;
byte_offset = reg + i - cfg->start_ofs;
if (byte_offset >= 0 && byte_offset < cfg->mem_size) {
*(cfg->mem + byte_offset) = val;
} else {
dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
reg, object->type, byte_offset);
return -EINVAL;
}
}
}
return 0;
}
static int mxt_upload_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
{
unsigned int byte_offset = 0;
int error;
/* Write configuration as blocks */
while (byte_offset < cfg->mem_size) {
unsigned int size = cfg->mem_size - byte_offset;
if (size > MXT_MAX_BLOCK_WRITE)
size = MXT_MAX_BLOCK_WRITE;
error = __mxt_write_reg(data->client,
cfg->start_ofs + byte_offset,
size, cfg->mem + byte_offset);
if (error) {
dev_err(&data->client->dev,
"Config write error, ret=%d\n", error);
return error;
}
byte_offset += size;
}
return 0;
}
static int mxt_init_t7_power_cfg(struct mxt_data *data);
/*
* mxt_update_cfg - download configuration to chip
*
* Atmel Raw Config File Format
*
* The first four lines of the raw config file contain:
* 1) Version
* 2) Chip ID Information (first 7 bytes of device memory)
* 3) Chip Information Block 24-bit CRC Checksum
* 4) Chip Configuration 24-bit CRC Checksum
*
* The rest of the file consists of one line per object instance:
* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
*
* <TYPE> - 2-byte object type as hex
* <INSTANCE> - 2-byte object instance number as hex
* <SIZE> - 2-byte object size as hex
* <CONTENTS> - array of <SIZE> 1-byte hex values
*/
static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw)
{
struct device *dev = &data->client->dev;
struct mxt_cfg cfg;
int ret;
int offset;
int i;
u32 info_crc, config_crc, calculated_crc;
u16 crc_start = 0;
/* Make zero terminated copy of the OBP_RAW file */
cfg.raw = kmemdup_nul(fw->data, fw->size, GFP_KERNEL);
if (!cfg.raw)
return -ENOMEM;
cfg.raw_size = fw->size;
mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
if (strncmp(cfg.raw, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
dev_err(dev, "Unrecognised config file\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos = strlen(MXT_CFG_MAGIC);
/* Load information block and check */
for (i = 0; i < sizeof(struct mxt_info); i++) {
ret = sscanf(cfg.raw + cfg.raw_pos, "%hhx%n",
(unsigned char *)&cfg.info + i,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
}
if (cfg.info.family_id != data->info->family_id) {
dev_err(dev, "Family ID mismatch!\n");
ret = -EINVAL;
goto release_raw;
}
if (cfg.info.variant_id != data->info->variant_id) {
dev_err(dev, "Variant ID mismatch!\n");
ret = -EINVAL;
goto release_raw;
}
/* Read CRCs */
ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &info_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Info CRC\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &config_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Config CRC\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
/*
* The Info Block CRC is calculated over mxt_info and the object
* table. If it does not match then we are trying to load the
* configuration from a different chip or firmware version, so
* the configuration CRC is invalid anyway.
*/
if (info_crc == data->info_crc) {
if (config_crc == 0 || data->config_crc == 0) {
dev_info(dev, "CRC zero, attempting to apply config\n");
} else if (config_crc == data->config_crc) {
dev_dbg(dev, "Config CRC 0x%06X: OK\n",
data->config_crc);
return 0;
} else {
dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
data->config_crc, config_crc);
}
} else {
dev_warn(dev,
"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
data->info_crc, info_crc);
}
/* Malloc memory to store configuration */
cfg.start_ofs = MXT_OBJECT_START +
data->info->object_num * sizeof(struct mxt_object) +
MXT_INFO_CHECKSUM_SIZE;
cfg.mem_size = data->mem_size - cfg.start_ofs;
cfg.mem = kzalloc(cfg.mem_size, GFP_KERNEL);
if (!cfg.mem) {
ret = -ENOMEM;
goto release_raw;
}
ret = mxt_prepare_cfg_mem(data, &cfg);
if (ret)
goto release_mem;
/* Calculate crc of the received configs (not the raw config file) */
if (data->T71_address)
crc_start = data->T71_address;
else if (data->T7_address)
crc_start = data->T7_address;
else
dev_warn(dev, "Could not find CRC start\n");
if (crc_start > cfg.start_ofs) {
calculated_crc = mxt_calculate_crc(cfg.mem,
crc_start - cfg.start_ofs,
cfg.mem_size);
if (config_crc > 0 && config_crc != calculated_crc)
dev_warn(dev, "Config CRC in file inconsistent, calculated=%06X, file=%06X\n",
calculated_crc, config_crc);
}
ret = mxt_upload_cfg_mem(data, &cfg);
if (ret)
goto release_mem;
mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
ret = mxt_soft_reset(data);
if (ret)
goto release_mem;
dev_info(dev, "Config successfully updated\n");
/* T7 config may have changed */
mxt_init_t7_power_cfg(data);
release_raw:
kfree(cfg.raw);
release_mem:
kfree(cfg.mem);
return ret;
}
static void mxt_free_input_device(struct mxt_data *data)
{
if (data->input_dev) {
input_unregister_device(data->input_dev);
data->input_dev = NULL;
}
}
static void mxt_free_object_table(struct mxt_data *data)
{
#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
video_unregister_device(&data->dbg.vdev);
v4l2_device_unregister(&data->dbg.v4l2);
#endif
data->object_table = NULL;
data->info = NULL;
kfree(data->raw_info_block);
data->raw_info_block = NULL;
kfree(data->msg_buf);
data->msg_buf = NULL;
data->T5_address = 0;
data->T5_msg_size = 0;
data->T6_reportid = 0;
data->T7_address = 0;
data->T71_address = 0;
data->T9_reportid_min = 0;
data->T9_reportid_max = 0;
data->T19_reportid = 0;
data->T44_address = 0;
data->T100_reportid_min = 0;
data->T100_reportid_max = 0;
data->max_reportid = 0;
}
static int mxt_parse_object_table(struct mxt_data *data,
struct mxt_object *object_table)
{
struct i2c_client *client = data->client;
int i;
u8 reportid;
u16 end_address;
/* Valid Report IDs start counting from 1 */
reportid = 1;
data->mem_size = 0;
for (i = 0; i < data->info->object_num; i++) {
struct mxt_object *object = object_table + i;
u8 min_id, max_id;
le16_to_cpus(&object->start_address);
if (object->num_report_ids) {
min_id = reportid;
reportid += object->num_report_ids *
mxt_obj_instances(object);
max_id = reportid - 1;
} else {
min_id = 0;
max_id = 0;
}
dev_dbg(&data->client->dev,
"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
object->type, object->start_address,
mxt_obj_size(object), mxt_obj_instances(object),
min_id, max_id);
switch (object->type) {
case MXT_GEN_MESSAGE_T5:
if (data->info->family_id == 0x80 &&
data->info->version < 0x20) {
/*
* On mXT224 firmware versions prior to V2.0
* read and discard unused CRC byte otherwise
* DMA reads are misaligned.
*/
data->T5_msg_size = mxt_obj_size(object);
} else {
/* CRC not enabled, so skip last byte */
data->T5_msg_size = mxt_obj_size(object) - 1;
}
data->T5_address = object->start_address;
break;
case MXT_GEN_COMMAND_T6:
data->T6_reportid = min_id;
data->T6_address = object->start_address;
break;
case MXT_GEN_POWER_T7:
data->T7_address = object->start_address;
break;
case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
data->T71_address = object->start_address;
break;
case MXT_TOUCH_MULTI_T9:
data->multitouch = MXT_TOUCH_MULTI_T9;
/* Only handle messages from first T9 instance */
data->T9_reportid_min = min_id;
data->T9_reportid_max = min_id +
object->num_report_ids - 1;
data->num_touchids = object->num_report_ids;
break;
case MXT_SPT_MESSAGECOUNT_T44:
data->T44_address = object->start_address;
break;
case MXT_SPT_GPIOPWM_T19:
data->T19_reportid = min_id;
break;
case MXT_TOUCH_MULTITOUCHSCREEN_T100:
data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
data->T100_reportid_min = min_id;
data->T100_reportid_max = max_id;
/* first two report IDs reserved */
data->num_touchids = object->num_report_ids - 2;
break;
}
end_address = object->start_address
+ mxt_obj_size(object) * mxt_obj_instances(object) - 1;
if (end_address >= data->mem_size)
data->mem_size = end_address + 1;
}
/* Store maximum reportid */
data->max_reportid = reportid;
/* If T44 exists, T5 position has to be directly after */
if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
dev_err(&client->dev, "Invalid T44 position\n");
return -EINVAL;
}
data->msg_buf = kcalloc(data->max_reportid,
data->T5_msg_size, GFP_KERNEL);
if (!data->msg_buf)
return -ENOMEM;
return 0;
}
static int mxt_read_info_block(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
size_t size;
void *id_buf, *buf;
uint8_t num_objects;
u32 calculated_crc;
u8 *crc_ptr;
/* If info block already allocated, free it */
if (data->raw_info_block)
mxt_free_object_table(data);
/* Read 7-byte ID information block starting at address 0 */
size = sizeof(struct mxt_info);
id_buf = kzalloc(size, GFP_KERNEL);
if (!id_buf)
return -ENOMEM;
error = __mxt_read_reg(client, 0, size, id_buf);
if (error)
goto err_free_mem;
/* Resize buffer to give space for rest of info block */
num_objects = ((struct mxt_info *)id_buf)->object_num;
size += (num_objects * sizeof(struct mxt_object))
+ MXT_INFO_CHECKSUM_SIZE;
buf = krealloc(id_buf, size, GFP_KERNEL);
if (!buf) {
error = -ENOMEM;
goto err_free_mem;
}
id_buf = buf;
/* Read rest of info block */
error = __mxt_read_reg(client, MXT_OBJECT_START,
size - MXT_OBJECT_START,
id_buf + MXT_OBJECT_START);
if (error)
goto err_free_mem;
/* Extract & calculate checksum */
crc_ptr = id_buf + size - MXT_INFO_CHECKSUM_SIZE;
data->info_crc = crc_ptr[0] | (crc_ptr[1] << 8) | (crc_ptr[2] << 16);
calculated_crc = mxt_calculate_crc(id_buf, 0,
size - MXT_INFO_CHECKSUM_SIZE);
/*
* CRC mismatch can be caused by data corruption due to I2C comms
* issue or else device is not using Object Based Protocol (eg i2c-hid)
*/
if ((data->info_crc == 0) || (data->info_crc != calculated_crc)) {
dev_err(&client->dev,
"Info Block CRC error calculated=0x%06X read=0x%06X\n",
calculated_crc, data->info_crc);
error = -EIO;
goto err_free_mem;
}
data->raw_info_block = id_buf;
data->info = (struct mxt_info *)id_buf;
dev_info(&client->dev,
"Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
data->info->family_id, data->info->variant_id,
data->info->version >> 4, data->info->version & 0xf,
data->info->build, data->info->object_num);
/* Parse object table information */
error = mxt_parse_object_table(data, id_buf + MXT_OBJECT_START);
if (error) {
dev_err(&client->dev, "Error %d parsing object table\n", error);
mxt_free_object_table(data);
goto err_free_mem;
}
data->object_table = (struct mxt_object *)(id_buf + MXT_OBJECT_START);
return 0;
err_free_mem:
kfree(id_buf);
return error;
}
static int mxt_read_t9_resolution(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct t9_range range;
unsigned char orient;
struct mxt_object *object;
object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
if (!object)
return -EINVAL;
error = __mxt_read_reg(client,
object->start_address + MXT_T9_XSIZE,
sizeof(data->xsize), &data->xsize);
if (error)
return error;
error = __mxt_read_reg(client,
object->start_address + MXT_T9_YSIZE,
sizeof(data->ysize), &data->ysize);
if (error)
return error;
error = __mxt_read_reg(client,
object->start_address + MXT_T9_RANGE,
sizeof(range), &range);
if (error)
return error;
data->max_x = get_unaligned_le16(&range.x);
data->max_y = get_unaligned_le16(&range.y);
error = __mxt_read_reg(client,
object->start_address + MXT_T9_ORIENT,
1, &orient);
if (error)
return error;
data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
data->invertx = orient & MXT_T9_ORIENT_INVERTX;
data->inverty = orient & MXT_T9_ORIENT_INVERTY;
return 0;
}
static int mxt_read_t100_config(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct mxt_object *object;
u16 range_x, range_y;
u8 cfg, tchaux;
u8 aux;
object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
if (!object)
return -EINVAL;
/* read touchscreen dimensions */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_XRANGE,
sizeof(range_x), &range_x);
if (error)
return error;
data->max_x = get_unaligned_le16(&range_x);
error = __mxt_read_reg(client,
object->start_address + MXT_T100_YRANGE,
sizeof(range_y), &range_y);
if (error)
return error;
data->max_y = get_unaligned_le16(&range_y);
error = __mxt_read_reg(client,
object->start_address + MXT_T100_XSIZE,
sizeof(data->xsize), &data->xsize);
if (error)
return error;
error = __mxt_read_reg(client,
object->start_address + MXT_T100_YSIZE,
sizeof(data->ysize), &data->ysize);
if (error)
return error;
/* read orientation config */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_CFG1,
1, &cfg);
if (error)
return error;
data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
data->invertx = cfg & MXT_T100_CFG_INVERTX;
data->inverty = cfg & MXT_T100_CFG_INVERTY;
/* allocate aux bytes */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_TCHAUX,
1, &tchaux);
if (error)
return error;
aux = 6;
if (tchaux & MXT_T100_TCHAUX_VECT)
data->t100_aux_vect = aux++;
if (tchaux & MXT_T100_TCHAUX_AMPL)
data->t100_aux_ampl = aux++;
if (tchaux & MXT_T100_TCHAUX_AREA)
data->t100_aux_area = aux++;
dev_dbg(&client->dev,
"T100 aux mappings vect:%u ampl:%u area:%u\n",
data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
return 0;
}
static int mxt_input_open(struct input_dev *dev);
static void mxt_input_close(struct input_dev *dev);
static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
struct mxt_data *data)
{
int i;
input_dev->name = "Atmel maXTouch Touchpad";
__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_X,
MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
MXT_PIXELS_PER_MM);
for (i = 0; i < data->t19_num_keys; i++)
if (data->t19_keymap[i] != KEY_RESERVED)
input_set_capability(input_dev, EV_KEY,
data->t19_keymap[i]);
}
static int mxt_initialize_input_device(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev;
int error;
unsigned int num_mt_slots;
unsigned int mt_flags = 0;
switch (data->multitouch) {
case MXT_TOUCH_MULTI_T9:
num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
error = mxt_read_t9_resolution(data);
if (error)
dev_warn(dev, "Failed to initialize T9 resolution\n");
break;
case MXT_TOUCH_MULTITOUCHSCREEN_T100:
num_mt_slots = data->num_touchids;
error = mxt_read_t100_config(data);
if (error)
dev_warn(dev, "Failed to read T100 config\n");
break;
default:
dev_err(dev, "Invalid multitouch object\n");
return -EINVAL;
}
/* Handle default values and orientation switch */
if (data->max_x == 0)
data->max_x = 1023;
if (data->max_y == 0)
data->max_y = 1023;
if (data->xy_switch)
swap(data->max_x, data->max_y);
dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
/* Register input device */
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = "Atmel maXTouch Touchscreen";
input_dev->phys = data->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = dev;
input_dev->open = mxt_input_open;
input_dev->close = mxt_input_close;
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
/* For single touch */
input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0);
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_ampl)) {
input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
}
/* If device has buttons we assume it is a touchpad */
if (data->t19_num_keys) {
mxt_set_up_as_touchpad(input_dev, data);
mt_flags |= INPUT_MT_POINTER;
} else {
mt_flags |= INPUT_MT_DIRECT;
}
/* For multi touch */
error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
if (error) {
dev_err(dev, "Error %d initialising slots\n", error);
goto err_free_mem;
}
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
0, MT_TOOL_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_MT_DISTANCE,
MXT_DISTANCE_ACTIVE_TOUCH,
MXT_DISTANCE_HOVERING,
0, 0);
}
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, data->max_y, 0, 0);
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_area)) {
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, MXT_MAX_AREA, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_ampl)) {
input_set_abs_params(input_dev, ABS_MT_PRESSURE,
0, 255, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_vect) {
input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
0, 255, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_vect) {
input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
0, 255, 0, 0);
}
input_set_drvdata(input_dev, data);
error = input_register_device(input_dev);
if (error) {
dev_err(dev, "Error %d registering input device\n", error);
goto err_free_mem;
}
data->input_dev = input_dev;
return 0;
err_free_mem:
input_free_device(input_dev);
return error;
}
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg);
static void mxt_config_cb(const struct firmware *cfg, void *ctx)
{
mxt_configure_objects(ctx, cfg);
release_firmware(cfg);
}
static int mxt_initialize(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int recovery_attempts = 0;
int error;
while (1) {
error = mxt_read_info_block(data);
if (!error)
break;
/* Check bootloader state */
error = mxt_probe_bootloader(data, false);
if (error) {
dev_info(&client->dev, "Trying alternate bootloader address\n");
error = mxt_probe_bootloader(data, true);
if (error) {
/* Chip is not in appmode or bootloader mode */
return error;
}
}
/* OK, we are in bootloader, see if we can recover */
if (++recovery_attempts > 1) {
dev_err(&client->dev, "Could not recover from bootloader mode\n");
/*
* We can reflash from this state, so do not
* abort initialization.
*/
data->in_bootloader = true;
return 0;
}
/* Attempt to exit bootloader into app mode */
mxt_send_bootloader_cmd(data, false);
msleep(MXT_FW_RESET_TIME);
}
error = mxt_acquire_irq(data);
if (error)
return error;
error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
&client->dev, GFP_KERNEL, data,
mxt_config_cb);
if (error) {
dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
error);
return error;
}
return 0;
}
static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
{
struct device *dev = &data->client->dev;
int error;
struct t7_config *new_config;
struct t7_config deepsleep = { .active = 0, .idle = 0 };
if (sleep == MXT_POWER_CFG_DEEPSLEEP)
new_config = &deepsleep;
else
new_config = &data->t7_cfg;
error = __mxt_write_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), new_config);
if (error)
return error;
dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
new_config->active, new_config->idle);
return 0;
}
static int mxt_init_t7_power_cfg(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int error;
bool retry = false;
recheck:
error = __mxt_read_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), &data->t7_cfg);
if (error)
return error;
if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
if (!retry) {
dev_dbg(dev, "T7 cfg zero, resetting\n");
mxt_soft_reset(data);
retry = true;
goto recheck;
} else {
dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
data->t7_cfg.active = 20;
data->t7_cfg.idle = 100;
return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
}
}
dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
data->t7_cfg.active, data->t7_cfg.idle);
return 0;
}
#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
static u16 mxt_get_debug_value(struct mxt_data *data, unsigned int x,
unsigned int y)
{
struct mxt_info *info = data->info;
struct mxt_dbg *dbg = &data->dbg;
unsigned int ofs, page;
unsigned int col = 0;
unsigned int col_width;
if (info->family_id == MXT_FAMILY_1386) {
col_width = info->matrix_ysize / MXT1386_COLUMNS;
col = y / col_width;
y = y % col_width;
} else {
col_width = info->matrix_ysize;
}
ofs = (y + (x * col_width)) * sizeof(u16);
page = ofs / MXT_DIAGNOSTIC_SIZE;
ofs %= MXT_DIAGNOSTIC_SIZE;
if (info->family_id == MXT_FAMILY_1386)
page += col * MXT1386_PAGES_PER_COLUMN;
return get_unaligned_le16(&dbg->t37_buf[page].data[ofs]);
}
static int mxt_convert_debug_pages(struct mxt_data *data, u16 *outbuf)
{
struct mxt_dbg *dbg = &data->dbg;
unsigned int x = 0;
unsigned int y = 0;
unsigned int i, rx, ry;
for (i = 0; i < dbg->t37_nodes; i++) {
/* Handle orientation */
rx = data->xy_switch ? y : x;
ry = data->xy_switch ? x : y;
rx = data->invertx ? (data->xsize - 1 - rx) : rx;
ry = data->inverty ? (data->ysize - 1 - ry) : ry;
outbuf[i] = mxt_get_debug_value(data, rx, ry);
/* Next value */
if (++x >= (data->xy_switch ? data->ysize : data->xsize)) {
x = 0;
y++;
}
}
return 0;
}
static int mxt_read_diagnostic_debug(struct mxt_data *data, u8 mode,
u16 *outbuf)
{
struct mxt_dbg *dbg = &data->dbg;
int retries = 0;
int page;
int ret;
u8 cmd = mode;
struct t37_debug *p;
u8 cmd_poll;
for (page = 0; page < dbg->t37_pages; page++) {
p = dbg->t37_buf + page;
ret = mxt_write_reg(data->client, dbg->diag_cmd_address,
cmd);
if (ret)
return ret;
retries = 0;
msleep(20);
wait_cmd:
/* Read back command byte */
ret = __mxt_read_reg(data->client, dbg->diag_cmd_address,
sizeof(cmd_poll), &cmd_poll);
if (ret)
return ret;
/* Field is cleared once the command has been processed */
if (cmd_poll) {
if (retries++ > 100)
return -EINVAL;
msleep(20);
goto wait_cmd;
}
/* Read T37 page */
ret = __mxt_read_reg(data->client, dbg->t37_address,
sizeof(struct t37_debug), p);
if (ret)
return ret;
if (p->mode != mode || p->page != page) {
dev_err(&data->client->dev, "T37 page mismatch\n");
return -EINVAL;
}
dev_dbg(&data->client->dev, "%s page:%d retries:%d\n",
__func__, page, retries);
/* For remaining pages, write PAGEUP rather than mode */
cmd = MXT_DIAGNOSTIC_PAGEUP;
}
return mxt_convert_debug_pages(data, outbuf);
}
static int mxt_queue_setup(struct vb2_queue *q,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct mxt_data *data = q->drv_priv;
size_t size = data->dbg.t37_nodes * sizeof(u16);
if (*nplanes)
return sizes[0] < size ? -EINVAL : 0;
*nplanes = 1;
sizes[0] = size;
return 0;
}
static void mxt_buffer_queue(struct vb2_buffer *vb)
{
struct mxt_data *data = vb2_get_drv_priv(vb->vb2_queue);
u16 *ptr;
int ret;
u8 mode;
ptr = vb2_plane_vaddr(vb, 0);
if (!ptr) {
dev_err(&data->client->dev, "Error acquiring frame ptr\n");
goto fault;
}
switch (data->dbg.input) {
case MXT_V4L_INPUT_DELTAS:
default:
mode = MXT_DIAGNOSTIC_DELTAS;
break;
case MXT_V4L_INPUT_REFS:
mode = MXT_DIAGNOSTIC_REFS;
break;
}
ret = mxt_read_diagnostic_debug(data, mode, ptr);
if (ret)
goto fault;
vb2_set_plane_payload(vb, 0, data->dbg.t37_nodes * sizeof(u16));
vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
return;
fault:
vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
}
/* V4L2 structures */
static const struct vb2_ops mxt_queue_ops = {
.queue_setup = mxt_queue_setup,
.buf_queue = mxt_buffer_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
};
static const struct vb2_queue mxt_queue = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
.buf_struct_size = sizeof(struct mxt_vb2_buffer),
.ops = &mxt_queue_ops,
.mem_ops = &vb2_vmalloc_memops,
.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
.min_buffers_needed = 1,
};
static int mxt_vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct mxt_data *data = video_drvdata(file);
strlcpy(cap->driver, "atmel_mxt_ts", sizeof(cap->driver));
strlcpy(cap->card, "atmel_mxt_ts touch", sizeof(cap->card));
snprintf(cap->bus_info, sizeof(cap->bus_info),
"I2C:%s", dev_name(&data->client->dev));
return 0;
}
static int mxt_vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
if (i->index >= MXT_V4L_INPUT_MAX)
return -EINVAL;
i->type = V4L2_INPUT_TYPE_TOUCH;
switch (i->index) {
case MXT_V4L_INPUT_REFS:
strlcpy(i->name, "Mutual Capacitance References",
sizeof(i->name));
break;
case MXT_V4L_INPUT_DELTAS:
strlcpy(i->name, "Mutual Capacitance Deltas", sizeof(i->name));
break;
}
return 0;
}
static int mxt_set_input(struct mxt_data *data, unsigned int i)
{
struct v4l2_pix_format *f = &data->dbg.format;
if (i >= MXT_V4L_INPUT_MAX)
return -EINVAL;
if (i == MXT_V4L_INPUT_DELTAS)
f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
else
f->pixelformat = V4L2_TCH_FMT_TU16;
f->width = data->xy_switch ? data->ysize : data->xsize;
f->height = data->xy_switch ? data->xsize : data->ysize;
f->field = V4L2_FIELD_NONE;
f->colorspace = V4L2_COLORSPACE_RAW;
f->bytesperline = f->width * sizeof(u16);
f->sizeimage = f->width * f->height * sizeof(u16);
data->dbg.input = i;
return 0;
}
static int mxt_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
return mxt_set_input(video_drvdata(file), i);
}
static int mxt_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
struct mxt_data *data = video_drvdata(file);
*i = data->dbg.input;
return 0;
}
static int mxt_vidioc_fmt(struct file *file, void *priv, struct v4l2_format *f)
{
struct mxt_data *data = video_drvdata(file);
f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
f->fmt.pix = data->dbg.format;
return 0;
}
static int mxt_vidioc_enum_fmt(struct file *file, void *priv,
struct v4l2_fmtdesc *fmt)
{
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
switch (fmt->index) {
case 0:
fmt->pixelformat = V4L2_TCH_FMT_TU16;
break;
case 1:
fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
break;
default:
return -EINVAL;
}
return 0;
}
static int mxt_vidioc_g_parm(struct file *file, void *fh,
struct v4l2_streamparm *a)
{
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
a->parm.capture.readbuffers = 1;
a->parm.capture.timeperframe.numerator = 1;
a->parm.capture.timeperframe.denominator = 10;
return 0;
}
static const struct v4l2_ioctl_ops mxt_video_ioctl_ops = {
.vidioc_querycap = mxt_vidioc_querycap,
.vidioc_enum_fmt_vid_cap = mxt_vidioc_enum_fmt,
.vidioc_s_fmt_vid_cap = mxt_vidioc_fmt,
.vidioc_g_fmt_vid_cap = mxt_vidioc_fmt,
.vidioc_try_fmt_vid_cap = mxt_vidioc_fmt,
.vidioc_g_parm = mxt_vidioc_g_parm,
.vidioc_enum_input = mxt_vidioc_enum_input,
.vidioc_g_input = mxt_vidioc_g_input,
.vidioc_s_input = mxt_vidioc_s_input,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_expbuf = vb2_ioctl_expbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
static const struct video_device mxt_video_device = {
.name = "Atmel maxTouch",
.fops = &mxt_video_fops,
.ioctl_ops = &mxt_video_ioctl_ops,
.release = video_device_release_empty,
.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
};
static void mxt_debug_init(struct mxt_data *data)
{
struct mxt_info *info = data->info;
struct mxt_dbg *dbg = &data->dbg;
struct mxt_object *object;
int error;
object = mxt_get_object(data, MXT_GEN_COMMAND_T6);
if (!object)
goto error;
dbg->diag_cmd_address = object->start_address + MXT_COMMAND_DIAGNOSTIC;
object = mxt_get_object(data, MXT_DEBUG_DIAGNOSTIC_T37);
if (!object)
goto error;
if (mxt_obj_size(object) != sizeof(struct t37_debug)) {
dev_warn(&data->client->dev, "Bad T37 size");
goto error;
}
dbg->t37_address = object->start_address;
/* Calculate size of data and allocate buffer */
dbg->t37_nodes = data->xsize * data->ysize;
if (info->family_id == MXT_FAMILY_1386)
dbg->t37_pages = MXT1386_COLUMNS * MXT1386_PAGES_PER_COLUMN;
else
dbg->t37_pages = DIV_ROUND_UP(data->xsize *
info->matrix_ysize *
sizeof(u16),
sizeof(dbg->t37_buf->data));
dbg->t37_buf = devm_kmalloc_array(&data->client->dev, dbg->t37_pages,
sizeof(struct t37_debug), GFP_KERNEL);
if (!dbg->t37_buf)
goto error;
/* init channel to zero */
mxt_set_input(data, 0);
/* register video device */
snprintf(dbg->v4l2.name, sizeof(dbg->v4l2.name), "%s", "atmel_mxt_ts");
error = v4l2_device_register(&data->client->dev, &dbg->v4l2);
if (error)
goto error;
/* initialize the queue */
mutex_init(&dbg->lock);
dbg->queue = mxt_queue;
dbg->queue.drv_priv = data;
dbg->queue.lock = &dbg->lock;
dbg->queue.dev = &data->client->dev;
error = vb2_queue_init(&dbg->queue);
if (error)
goto error_unreg_v4l2;
dbg->vdev = mxt_video_device;
dbg->vdev.v4l2_dev = &dbg->v4l2;
dbg->vdev.lock = &dbg->lock;
dbg->vdev.vfl_dir = VFL_DIR_RX;
dbg->vdev.queue = &dbg->queue;
video_set_drvdata(&dbg->vdev, data);
error = video_register_device(&dbg->vdev, VFL_TYPE_TOUCH, -1);
if (error)
goto error_unreg_v4l2;
return;
error_unreg_v4l2:
v4l2_device_unregister(&dbg->v4l2);
error:
dev_warn(&data->client->dev, "Error initializing T37\n");
}
#else
static void mxt_debug_init(struct mxt_data *data)
{
}
#endif
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg)
{
struct device *dev = &data->client->dev;
int error;
error = mxt_init_t7_power_cfg(data);
if (error) {
dev_err(dev, "Failed to initialize power cfg\n");
return error;
}
if (cfg) {
error = mxt_update_cfg(data, cfg);
if (error)
dev_warn(dev, "Error %d updating config\n", error);
}
if (data->multitouch) {
error = mxt_initialize_input_device(data);
if (error)
return error;
} else {
dev_warn(dev, "No touch object detected\n");
}
mxt_debug_init(data);
return 0;
}
/* Firmware Version is returned as Major.Minor.Build */
static ssize_t mxt_fw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_info *info = data->info;
return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
info->version >> 4, info->version & 0xf, info->build);
}
/* Hardware Version is returned as FamilyID.VariantID */
static ssize_t mxt_hw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_info *info = data->info;
return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
info->family_id, info->variant_id);
}
static ssize_t mxt_show_instance(char *buf, int count,
struct mxt_object *object, int instance,
const u8 *val)
{
int i;
if (mxt_obj_instances(object) > 1)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Instance %u\n", instance);
for (i = 0; i < mxt_obj_size(object); i++)
count += scnprintf(buf + count, PAGE_SIZE - count,
"\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
return count;
}
static ssize_t mxt_object_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_object *object;
int count = 0;
int i, j;
int error;
u8 *obuf;
/* Pre-allocate buffer large enough to hold max sized object. */
obuf = kmalloc(256, GFP_KERNEL);
if (!obuf)
return -ENOMEM;
error = 0;
for (i = 0; i < data->info->object_num; i++) {
object = data->object_table + i;
if (!mxt_object_readable(object->type))
continue;
count += scnprintf(buf + count, PAGE_SIZE - count,
"T%u:\n", object->type);
for (j = 0; j < mxt_obj_instances(object); j++) {
u16 size = mxt_obj_size(object);
u16 addr = object->start_address + j * size;
error = __mxt_read_reg(data->client, addr, size, obuf);
if (error)
goto done;
count = mxt_show_instance(buf, count, object, j, obuf);
}
}
done:
kfree(obuf);
return error ?: count;
}
static int mxt_check_firmware_format(struct device *dev,
const struct firmware *fw)
{
unsigned int pos = 0;
char c;
while (pos < fw->size) {
c = *(fw->data + pos);
if (c < '0' || (c > '9' && c < 'A') || c > 'F')
return 0;
pos++;
}
/*
* To convert file try:
* xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
*/
dev_err(dev, "Aborting: firmware file must be in binary format\n");
return -EINVAL;
}
static int mxt_load_fw(struct device *dev, const char *fn)
{
struct mxt_data *data = dev_get_drvdata(dev);
const struct firmware *fw = NULL;
unsigned int frame_size;
unsigned int pos = 0;
unsigned int retry = 0;
unsigned int frame = 0;
int ret;
ret = request_firmware(&fw, fn, dev);
if (ret) {
dev_err(dev, "Unable to open firmware %s\n", fn);
return ret;
}
/* Check for incorrect enc file */
ret = mxt_check_firmware_format(dev, fw);
if (ret)
goto release_firmware;
if (!data->in_bootloader) {
/* Change to the bootloader mode */
data->in_bootloader = true;
ret = mxt_t6_command(data, MXT_COMMAND_RESET,
MXT_BOOT_VALUE, false);
if (ret)
goto release_firmware;
msleep(MXT_RESET_TIME);
/* Do not need to scan since we know family ID */
ret = mxt_lookup_bootloader_address(data, 0);
if (ret)
goto release_firmware;
mxt_free_input_device(data);
mxt_free_object_table(data);
} else {
enable_irq(data->irq);
}
reinit_completion(&data->bl_completion);
ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false);
if (ret) {
/* Bootloader may still be unlocked from previous attempt */
ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false);
if (ret)
goto disable_irq;
} else {
dev_info(dev, "Unlocking bootloader\n");
/* Unlock bootloader */
ret = mxt_send_bootloader_cmd(data, true);
if (ret)
goto disable_irq;
}
while (pos < fw->size) {
ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
if (ret)
goto disable_irq;
frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
/* Take account of CRC bytes */
frame_size += 2;
/* Write one frame to device */
ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
if (ret)
goto disable_irq;
ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
if (ret) {
retry++;
/* Back off by 20ms per retry */
msleep(retry * 20);
if (retry > 20) {
dev_err(dev, "Retry count exceeded\n");
goto disable_irq;
}
} else {
retry = 0;
pos += frame_size;
frame++;
}
if (frame % 50 == 0)
dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
frame, pos, fw->size);
}
/* Wait for flash. */
ret = mxt_wait_for_completion(data, &data->bl_completion,
MXT_FW_RESET_TIME);
if (ret)
goto disable_irq;
dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
/*
* Wait for device to reset. Some bootloader versions do not assert
* the CHG line after bootloading has finished, so ignore potential
* errors.
*/
mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME);
data->in_bootloader = false;
disable_irq:
disable_irq(data->irq);
release_firmware:
release_firmware(fw);
return ret;
}
static ssize_t mxt_update_fw_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
int error;
error = mxt_load_fw(dev, MXT_FW_NAME);
if (error) {
dev_err(dev, "The firmware update failed(%d)\n", error);
count = error;
} else {
dev_info(dev, "The firmware update succeeded\n");
error = mxt_initialize(data);
if (error)
return error;
}
return count;
}
static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
static struct attribute *mxt_attrs[] = {
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_object.attr,
&dev_attr_update_fw.attr,
NULL
};
static const struct attribute_group mxt_attr_group = {
.attrs = mxt_attrs,
};
static void mxt_start(struct mxt_data *data)
{
switch (data->suspend_mode) {
case MXT_SUSPEND_T9_CTRL:
mxt_soft_reset(data);
/* Touch enable */
/* 0x83 = SCANEN | RPTEN | ENABLE */
mxt_write_object(data,
MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
break;
case MXT_SUSPEND_DEEP_SLEEP:
default:
mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
/* Recalibrate since chip has been in deep sleep */
mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
break;
}
}
static void mxt_stop(struct mxt_data *data)
{
switch (data->suspend_mode) {
case MXT_SUSPEND_T9_CTRL:
/* Touch disable */
mxt_write_object(data,
MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
break;
case MXT_SUSPEND_DEEP_SLEEP:
default:
mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
break;
}
}
static int mxt_input_open(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
mxt_start(data);
return 0;
}
static void mxt_input_close(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
mxt_stop(data);
}
static int mxt_parse_device_properties(struct mxt_data *data)
{
static const char keymap_property[] = "linux,gpio-keymap";
struct device *dev = &data->client->dev;
u32 *keymap;
int n_keys;
int error;
if (device_property_present(dev, keymap_property)) {
n_keys = device_property_read_u32_array(dev, keymap_property,
NULL, 0);
if (n_keys <= 0) {
error = n_keys < 0 ? n_keys : -EINVAL;
dev_err(dev, "invalid/malformed '%s' property: %d\n",
keymap_property, error);
return error;
}
keymap = devm_kmalloc_array(dev, n_keys, sizeof(*keymap),
GFP_KERNEL);
if (!keymap)
return -ENOMEM;
error = device_property_read_u32_array(dev, keymap_property,
keymap, n_keys);
if (error) {
dev_err(dev, "failed to parse '%s' property: %d\n",
keymap_property, error);
return error;
}
data->t19_keymap = keymap;
data->t19_num_keys = n_keys;
}
return 0;
}
static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
},
},
{
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
},
},
{ }
};
static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct mxt_data *data;
int error;
/*
* Ignore devices that do not have device properties attached to
* them, as we need help determining whether we are dealing with
* touch screen or touchpad.
*
* So far on x86 the only users of Atmel touch controllers are
* Chromebooks, and chromeos_laptop driver will ensure that
* necessary properties are provided (if firmware does not do that).
*/
if (!device_property_present(&client->dev, "compatible"))
return -ENXIO;
/*
* Ignore ACPI devices representing bootloader mode.
*
* This is a bit of a hack: Google Chromebook BIOS creates ACPI
* devices for both application and bootloader modes, but we are
* interested in application mode only (if device is in bootloader
* mode we'll end up switching into application anyway). So far
* application mode addresses were all above 0x40, so we'll use it
* as a threshold.
*/
if (ACPI_COMPANION(&client->dev) && client->addr < 0x40)
return -ENXIO;
data = devm_kzalloc(&client->dev, sizeof(struct mxt_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
client->adapter->nr, client->addr);
data->client = client;
data->irq = client->irq;
i2c_set_clientdata(client, data);
init_completion(&data->bl_completion);
init_completion(&data->reset_completion);
init_completion(&data->crc_completion);
data->suspend_mode = dmi_check_system(chromebook_T9_suspend_dmi) ?
MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP;
error = mxt_parse_device_properties(data);
if (error)
return error;
data->reset_gpio = devm_gpiod_get_optional(&client->dev,
"reset", GPIOD_OUT_LOW);
if (IS_ERR(data->reset_gpio)) {
error = PTR_ERR(data->reset_gpio);
dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
return error;
}
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, mxt_interrupt, IRQF_ONESHOT,
client->name, data);
if (error) {
dev_err(&client->dev, "Failed to register interrupt\n");
return error;
}
disable_irq(client->irq);
if (data->reset_gpio) {
msleep(MXT_RESET_GPIO_TIME);
gpiod_set_value(data->reset_gpio, 1);
msleep(MXT_RESET_INVALID_CHG);
}
error = mxt_initialize(data);
if (error)
return error;
error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
if (error) {
dev_err(&client->dev, "Failure %d creating sysfs group\n",
error);
goto err_free_object;
}
return 0;
err_free_object:
mxt_free_input_device(data);
mxt_free_object_table(data);
return error;
}
static int mxt_remove(struct i2c_client *client)
{
struct mxt_data *data = i2c_get_clientdata(client);
disable_irq(data->irq);
sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
mxt_free_input_device(data);
mxt_free_object_table(data);
return 0;
}
static int __maybe_unused mxt_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
if (!input_dev)
return 0;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_stop(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static int __maybe_unused mxt_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
if (!input_dev)
return 0;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_start(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
static const struct of_device_id mxt_of_match[] = {
{ .compatible = "atmel,maxtouch", },
/* Compatibles listed below are deprecated */
{ .compatible = "atmel,qt602240_ts", },
{ .compatible = "atmel,atmel_mxt_ts", },
{ .compatible = "atmel,atmel_mxt_tp", },
{ .compatible = "atmel,mXT224", },
{},
};
MODULE_DEVICE_TABLE(of, mxt_of_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id mxt_acpi_id[] = {
{ "ATML0000", 0 }, /* Touchpad */
{ "ATML0001", 0 }, /* Touchscreen */
{ }
};
MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
#endif
static const struct i2c_device_id mxt_id[] = {
{ "qt602240_ts", 0 },
{ "atmel_mxt_ts", 0 },
{ "atmel_mxt_tp", 0 },
{ "maxtouch", 0 },
{ "mXT224", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mxt_id);
static struct i2c_driver mxt_driver = {
.driver = {
.name = "atmel_mxt_ts",
.of_match_table = mxt_of_match,
.acpi_match_table = ACPI_PTR(mxt_acpi_id),
.pm = &mxt_pm_ops,
},
.probe = mxt_probe,
.remove = mxt_remove,
.id_table = mxt_id,
};
module_i2c_driver(mxt_driver);
/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
MODULE_LICENSE("GPL");
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