hwmon: (pmbus/adm1266) Add support for GPIOs
Adm1266 exposes 9 GPIOs and 16 PDIOs which are currently read-only. They are controlled by the internal sequencing engine. This patch makes adm1266 driver expose GPIOs and PDIOs to user-space using GPIO provider kernel api. Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com> Link: https://lore.kernel.org/r/20200812142055.9213-4-alexandru.tachici@analog.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexandru Tachici
Guenter Roeck
parent
407dc802a9
commit
d98dfad35c
@ -29,6 +29,7 @@ config SENSORS_PMBUS
|
||||
config SENSORS_ADM1266
|
||||
tristate "Analog Devices ADM1266 Sequencer"
|
||||
select CRC8
|
||||
depends on GPIOLIB
|
||||
help
|
||||
If you say yes here you get hardware monitoring support for Analog
|
||||
Devices ADM1266 Cascadable Super Sequencer.
|
||||
|
||||
@ -6,18 +6,42 @@
|
||||
* 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 "pmbus.h"
|
||||
#include <linux/slab.h>
|
||||
|
||||
#define ADM1266_PDIO_CONFIG 0xD4
|
||||
#define ADM1266_GPIO_CONFIG 0xE1
|
||||
#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_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 mutex buf_mutex;
|
||||
u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
|
||||
@ -93,9 +117,185 @@ static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len,
|
||||
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_probe(struct i2c_client *client)
|
||||
{
|
||||
struct adm1266_data *data;
|
||||
int ret;
|
||||
int i;
|
||||
|
||||
data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), GFP_KERNEL);
|
||||
@ -111,6 +311,10 @@ static int adm1266_probe(struct i2c_client *client)
|
||||
crc8_populate_msb(pmbus_crc_table, 0x7);
|
||||
mutex_init(&data->buf_mutex);
|
||||
|
||||
ret = adm1266_config_gpio(data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return pmbus_do_probe(client, &data->info);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user