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hwmon: (ucd9000) Add gpio chip interface 

Add a struct gpio_chip and define some methods so that this device's
I/O can be accessed via /sys/class/gpio.

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Christopher Bostic 2018-03-16 16:22:05 -05:00 committed by Guenter Roeck
parent 81820059a4
commit ca781fb7fd
1 changed files with 212 additions and 0 deletions
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212
drivers/hwmon/pmbus/ucd9000.c
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@ -27,6 +27,8 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include <linux/gpio.h>
#include <linux/gpio/driver.h>
#include "pmbus.h"
enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
@ -35,8 +37,18 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
#define UCD9000_GPIO_SELECT 0xfa
#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
/* GPIO CONFIG bits */
#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
#define UCD9000_GPIO_INPUT 0
#define UCD9000_GPIO_OUTPUT 1
#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
@ -47,9 +59,17 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
#define UCD9000_NUM_FAN 4
#define UCD9000_GPIO_NAME_LEN 16
#define UCD9090_NUM_GPIOS 23
#define UCD901XX_NUM_GPIOS 26
#define UCD90910_NUM_GPIOS 26
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
@ -149,6 +169,196 @@ static const struct of_device_id ucd9000_of_match[] = {
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);
#ifdef CONFIG_GPIOLIB
static int ucd9000_gpio_read_config(struct i2c_client *client,
unsigned int offset)
{
int ret;
/* No page set required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
if (ret < 0)
return ret;
return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
}
static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
}
static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0) {
dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
offset, ret);
return;
}
if (value) {
if (ret & UCD9000_GPIO_CONFIG_STATUS)
return;
ret |= UCD9000_GPIO_CONFIG_STATUS;
} else {
if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
return;
ret &= ~UCD9000_GPIO_CONFIG_STATUS;
}
ret |= UCD9000_GPIO_CONFIG_ENABLE;
/* Page set not required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
if (ret < 0) {
dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
offset, ret);
return;
}
ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
if (ret < 0)
dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
offset, ret);
}
static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
unsigned int offset)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
}
static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
unsigned int offset, bool direction_out,
int requested_out)
{
struct i2c_client *client = gpiochip_get_data(gc);
int ret, config, out_val;
ret = ucd9000_gpio_read_config(client, offset);
if (ret < 0)
return ret;
if (direction_out) {
out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
return 0;
} else {
ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
}
if (out_val)
ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
else
ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
} else {
if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
return 0;
ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
}
ret |= UCD9000_GPIO_CONFIG_ENABLE;
config = ret;
/* Page set not required */
ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
if (ret < 0)
return ret;
config &= ~UCD9000_GPIO_CONFIG_ENABLE;
return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
}
static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
}
static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int val)
{
return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
val);
}
static void ucd9000_probe_gpio(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
int rc;
switch (mid->driver_data) {
case ucd9090:
data->gpio.ngpio = UCD9090_NUM_GPIOS;
break;
case ucd90120:
case ucd90124:
case ucd90160:
data->gpio.ngpio = UCD901XX_NUM_GPIOS;
break;
case ucd90910:
data->gpio.ngpio = UCD90910_NUM_GPIOS;
break;
default:
return; /* GPIO support is optional. */
}
/*
* Pinmux support has not been added to the new gpio_chip.
* This support should be added when possible given the mux
* behavior of these IO devices.
*/
data->gpio.label = client->name;
data->gpio.get_direction = ucd9000_gpio_get_direction;
data->gpio.direction_input = ucd9000_gpio_direction_input;
data->gpio.direction_output = ucd9000_gpio_direction_output;
data->gpio.get = ucd9000_gpio_get;
data->gpio.set = ucd9000_gpio_set;
data->gpio.can_sleep = true;
data->gpio.base = -1;
data->gpio.parent = &client->dev;
rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
if (rc)
dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
}
#else
static void ucd9000_probe_gpio(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
}
#endif /* CONFIG_GPIOLIB */
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -263,6 +473,8 @@ static int ucd9000_probe(struct i2c_client *client,
| PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
}
ucd9000_probe_gpio(client, mid, data);
return pmbus_do_probe(client, mid, info);
}