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linux/drivers/hwmon/pmbus/adm1266.c
Bartosz Golaszewski 3bce071a30 hwmon: (pmbus) shrink code and remove pmbus_do_remove() 
The only action currently performed in pmbus_do_remove() is removing the
debugfs hierarchy. We can schedule a devm action at probe time and remove
pmbus_do_remove() entirely from all pmbus drivers.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20201026105352.20359-1-brgl@bgdev.pl
[groeck: Removed references to pmbus_do_remove from documentation]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-12-02 17:42:23 -08:00

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// SPDX-License-Identifier: GPL-2.0
/*
* ADM1266 - Cascadable Super Sequencer with Margin
* Control and Fault Recording
*
* Copyright 2020 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/crc8.h>
#include <linux/debugfs.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
#include "pmbus.h"
#include <linux/slab.h>
#include <linux/timekeeping.h>
#define ADM1266_BLACKBOX_CONFIG 0xD3
#define ADM1266_PDIO_CONFIG 0xD4
#define ADM1266_READ_STATE 0xD9
#define ADM1266_READ_BLACKBOX 0xDE
#define ADM1266_SET_RTC 0xDF
#define ADM1266_GPIO_CONFIG 0xE1
#define ADM1266_BLACKBOX_INFO 0xE6
#define ADM1266_PDIO_STATUS 0xE9
#define ADM1266_GPIO_STATUS 0xEA
/* ADM1266 GPIO defines */
#define ADM1266_GPIO_NR 9
#define ADM1266_GPIO_FUNCTIONS(x) FIELD_GET(BIT(0), x)
#define ADM1266_GPIO_INPUT_EN(x) FIELD_GET(BIT(2), x)
#define ADM1266_GPIO_OUTPUT_EN(x) FIELD_GET(BIT(3), x)
#define ADM1266_GPIO_OPEN_DRAIN(x) FIELD_GET(BIT(4), x)
/* ADM1266 PDIO defines */
#define ADM1266_PDIO_NR 16
#define ADM1266_PDIO_PIN_CFG(x) FIELD_GET(GENMASK(15, 13), x)
#define ADM1266_PDIO_GLITCH_FILT(x) FIELD_GET(GENMASK(12, 9), x)
#define ADM1266_PDIO_OUT_CFG(x) FIELD_GET(GENMASK(2, 0), x)
#define ADM1266_BLACKBOX_OFFSET 0
#define ADM1266_BLACKBOX_SIZE 64
#define ADM1266_PMBUS_BLOCK_MAX 255
struct adm1266_data {
struct pmbus_driver_info info;
struct gpio_chip gc;
const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
struct i2c_client *client;
struct dentry *debugfs_dir;
struct nvmem_config nvmem_config;
struct nvmem_device *nvmem;
u8 *dev_mem;
struct mutex buf_mutex;
u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
};
static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
{
.name = "blackbox",
.offset = ADM1266_BLACKBOX_OFFSET,
.bytes = 2048,
},
};
DECLARE_CRC8_TABLE(pmbus_crc_table);
/*
* Different from Block Read as it sends data and waits for the slave to
* return a value dependent on that data. The protocol is simply a Write Block
* followed by a Read Block without the Read-Block command field and the
* Write-Block STOP bit.
*/
static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len, u8 *data_w,
u8 *data_r)
{
struct i2c_client *client = data->client;
struct i2c_msg msgs[2] = {
{
.addr = client->addr,
.flags = I2C_M_DMA_SAFE,
.buf = data->write_buf,
.len = w_len + 2,
},
{
.addr = client->addr,
.flags = I2C_M_RD | I2C_M_DMA_SAFE,
.buf = data->read_buf,
.len = ADM1266_PMBUS_BLOCK_MAX + 2,
}
};
u8 addr;
u8 crc;
int ret;
mutex_lock(&data->buf_mutex);
msgs[0].buf[0] = cmd;
msgs[0].buf[1] = w_len;
memcpy(&msgs[0].buf[2], data_w, w_len);
ret = i2c_transfer(client->adapter, msgs, 2);
if (ret != 2) {
if (ret >= 0)
ret = -EPROTO;
mutex_unlock(&data->buf_mutex);
return ret;
}
if (client->flags & I2C_CLIENT_PEC) {
addr = i2c_8bit_addr_from_msg(&msgs[0]);
crc = crc8(pmbus_crc_table, &addr, 1, 0);
crc = crc8(pmbus_crc_table, msgs[0].buf, msgs[0].len, crc);
addr = i2c_8bit_addr_from_msg(&msgs[1]);
crc = crc8(pmbus_crc_table, &addr, 1, crc);
crc = crc8(pmbus_crc_table, msgs[1].buf, msgs[1].buf[0] + 1, crc);
if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) {
mutex_unlock(&data->buf_mutex);
return -EBADMSG;
}
}
memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);
ret = msgs[1].buf[0];
mutex_unlock(&data->buf_mutex);
return ret;
}
static const unsigned int adm1266_gpio_mapping[ADM1266_GPIO_NR][2] = {
{1, 0},
{2, 1},
{3, 2},
{4, 8},
{5, 9},
{6, 10},
{7, 11},
{8, 6},
{9, 7},
};
static const char *adm1266_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR] = {
"GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7", "GPIO8",
"GPIO9", "PDIO1", "PDIO2", "PDIO3", "PDIO4", "PDIO5", "PDIO6",
"PDIO7", "PDIO8", "PDIO9", "PDIO10", "PDIO11", "PDIO12", "PDIO13",
"PDIO14", "PDIO15", "PDIO16",
};
static int adm1266_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct adm1266_data *data = gpiochip_get_data(chip);
u8 read_buf[I2C_SMBUS_BLOCK_MAX + 1];
unsigned long pins_status;
unsigned int pmbus_cmd;
int ret;
if (offset < ADM1266_GPIO_NR)
pmbus_cmd = ADM1266_GPIO_STATUS;
else
pmbus_cmd = ADM1266_PDIO_STATUS;
ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf);
if (ret < 0)
return ret;
pins_status = read_buf[0] + (read_buf[1] << 8);
if (offset < ADM1266_GPIO_NR)
return test_bit(adm1266_gpio_mapping[offset][1], &pins_status);
return test_bit(offset - ADM1266_GPIO_NR, &pins_status);
}
static int adm1266_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct adm1266_data *data = gpiochip_get_data(chip);
u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
unsigned long status;
unsigned int gpio_nr;
int ret;
ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf);
if (ret < 0)
return ret;
status = read_buf[0] + (read_buf[1] << 8);
*bits = 0;
for_each_set_bit(gpio_nr, mask, ADM1266_GPIO_NR) {
if (test_bit(adm1266_gpio_mapping[gpio_nr][1], &status))
set_bit(gpio_nr, bits);
}
ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, read_buf);
if (ret < 0)
return ret;
status = read_buf[0] + (read_buf[1] << 8);
*bits = 0;
for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {
if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status))
set_bit(gpio_nr, bits);
}
return 0;
}
static void adm1266_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
struct adm1266_data *data = gpiochip_get_data(chip);
u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
unsigned long gpio_config;
unsigned long pdio_config;
unsigned long pin_cfg;
u8 write_cmd;
int ret;
int i;
for (i = 0; i < ADM1266_GPIO_NR; i++) {
write_cmd = adm1266_gpio_mapping[i][1];
ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf);
if (ret != 2)
return;
gpio_config = read_buf[0];
seq_puts(s, adm1266_names[i]);
seq_puts(s, " ( ");
if (!ADM1266_GPIO_FUNCTIONS(gpio_config)) {
seq_puts(s, "high-Z )\n");
continue;
}
if (ADM1266_GPIO_INPUT_EN(gpio_config))
seq_puts(s, "input ");
if (ADM1266_GPIO_OUTPUT_EN(gpio_config))
seq_puts(s, "output ");
if (ADM1266_GPIO_OPEN_DRAIN(gpio_config))
seq_puts(s, "open-drain )\n");
else
seq_puts(s, "push-pull )\n");
}
write_cmd = 0xFF;
ret = adm1266_pmbus_block_xfer(data, ADM1266_PDIO_CONFIG, 1, &write_cmd, read_buf);
if (ret != 32)
return;
for (i = 0; i < ADM1266_PDIO_NR; i++) {
seq_puts(s, adm1266_names[ADM1266_GPIO_NR + i]);
pdio_config = read_buf[2 * i];
pdio_config += (read_buf[2 * i + 1] << 8);
pin_cfg = ADM1266_PDIO_PIN_CFG(pdio_config);
seq_puts(s, " ( ");
if (!pin_cfg || pin_cfg > 5) {
seq_puts(s, "high-Z )\n");
continue;
}
if (pin_cfg & BIT(0))
seq_puts(s, "output ");
if (pin_cfg & BIT(1))
seq_puts(s, "input ");
seq_puts(s, ")\n");
}
}
static int adm1266_config_gpio(struct adm1266_data *data)
{
const char *name = dev_name(&data->client->dev);
char *gpio_name;
int ret;
int i;
for (i = 0; i < ARRAY_SIZE(data->gpio_names); i++) {
gpio_name = devm_kasprintf(&data->client->dev, GFP_KERNEL, "adm1266-%x-%s",
data->client->addr, adm1266_names[i]);
if (!gpio_name)
return -ENOMEM;
data->gpio_names[i] = gpio_name;
}
data->gc.label = name;
data->gc.parent = &data->client->dev;
data->gc.owner = THIS_MODULE;
data->gc.base = -1;
data->gc.names = data->gpio_names;
data->gc.ngpio = ARRAY_SIZE(data->gpio_names);
data->gc.get = adm1266_gpio_get;
data->gc.get_multiple = adm1266_gpio_get_multiple;
data->gc.dbg_show = adm1266_gpio_dbg_show;
ret = devm_gpiochip_add_data(&data->client->dev, &data->gc, data);
if (ret)
dev_err(&data->client->dev, "GPIO registering failed (%d)\n", ret);
return ret;
}
static int adm1266_state_read(struct seq_file *s, void *pdata)
{
struct device *dev = s->private;
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE);
if (ret < 0)
return ret;
seq_printf(s, "%d\n", ret);
return 0;
}
static void adm1266_init_debugfs(struct adm1266_data *data)
{
struct dentry *root;
root = pmbus_get_debugfs_dir(data->client);
if (!root)
return;
data->debugfs_dir = debugfs_create_dir(data->client->name, root);
if (!data->debugfs_dir)
return;
debugfs_create_devm_seqfile(&data->client->dev, "sequencer_state", data->debugfs_dir,
adm1266_state_read);
}
static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff)
{
int record_count;
char index;
u8 buf[5];
int ret;
ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf);
if (ret < 0)
return ret;
if (ret != 4)
return -EIO;
record_count = buf[3];
for (index = 0; index < record_count; index++) {
ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);
if (ret < 0)
return ret;
if (ret != ADM1266_BLACKBOX_SIZE)
return -EIO;
read_buff += ADM1266_BLACKBOX_SIZE;
}
return 0;
}
static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct adm1266_data *data = priv;
int ret;
if (offset + bytes > data->nvmem_config.size)
return -EINVAL;
if (offset == 0) {
memset(data->dev_mem, 0, data->nvmem_config.size);
ret = adm1266_nvmem_read_blackbox(data, data->dev_mem);
if (ret) {
dev_err(&data->client->dev, "Could not read blackbox!");
return ret;
}
}
memcpy(val, data->dev_mem + offset, bytes);
return 0;
}
static int adm1266_config_nvmem(struct adm1266_data *data)
{
data->nvmem_config.name = dev_name(&data->client->dev);
data->nvmem_config.dev = &data->client->dev;
data->nvmem_config.root_only = true;
data->nvmem_config.read_only = true;
data->nvmem_config.owner = THIS_MODULE;
data->nvmem_config.reg_read = adm1266_nvmem_read;
data->nvmem_config.cells = adm1266_nvmem_cells;
data->nvmem_config.ncells = ARRAY_SIZE(adm1266_nvmem_cells);
data->nvmem_config.priv = data;
data->nvmem_config.stride = 1;
data->nvmem_config.word_size = 1;
data->nvmem_config.size = adm1266_nvmem_cells[0].bytes;
data->dev_mem = devm_kzalloc(&data->client->dev, data->nvmem_config.size, GFP_KERNEL);
if (!data->dev_mem)
return -ENOMEM;
data->nvmem = devm_nvmem_register(&data->client->dev, &data->nvmem_config);
if (IS_ERR(data->nvmem)) {
dev_err(&data->client->dev, "Could not register nvmem!");
return PTR_ERR(data->nvmem);
}
return 0;
}
static int adm1266_set_rtc(struct adm1266_data *data)
{
time64_t kt;
char write_buf[6];
int i;
kt = ktime_get_seconds();
memset(write_buf, 0, sizeof(write_buf));
for (i = 0; i < 4; i++)
write_buf[2 + i] = (kt >> (i * 8)) & 0xFF;
return i2c_smbus_write_block_data(data->client, ADM1266_SET_RTC, sizeof(write_buf),
write_buf);
}
static int adm1266_probe(struct i2c_client *client)
{
struct adm1266_data *data;
int ret;
int i;
data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
data->info.pages = 17;
data->info.format[PSC_VOLTAGE_OUT] = linear;
for (i = 0; i < data->info.pages; i++)
data->info.func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
crc8_populate_msb(pmbus_crc_table, 0x7);
mutex_init(&data->buf_mutex);
ret = adm1266_config_gpio(data);
if (ret < 0)
return ret;
ret = adm1266_set_rtc(data);
if (ret < 0)
return ret;
ret = adm1266_config_nvmem(data);
if (ret < 0)
return ret;
ret = pmbus_do_probe(client, &data->info);
if (ret)
return ret;
adm1266_init_debugfs(data);
return 0;
}
static const struct of_device_id adm1266_of_match[] = {
{ .compatible = "adi,adm1266" },
{ }
};
MODULE_DEVICE_TABLE(of, adm1266_of_match);
static const struct i2c_device_id adm1266_id[] = {
{ "adm1266", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adm1266_id);
static struct i2c_driver adm1266_driver = {
.driver = {
.name = "adm1266",
.of_match_table = adm1266_of_match,
},
.probe_new = adm1266_probe,
.id_table = adm1266_id,
};
module_i2c_driver(adm1266_driver);
MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266");
MODULE_LICENSE("GPL v2");
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