mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 21:51:40 +00:00
e35b5ab0a7
These structures are only used to copy into other structures, so declare them as const. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct gpio_chip i@p = { ... }; @ok@ identifier r.i; expression e; position p; @@ e = i@p; @bad@ position p != {r.p,ok.p}; identifier r.i; struct gpio_chip e; @@ e@i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct gpio_chip i = { ... }; // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
/*
|
|
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Andrew F. Davis <afd@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether expressed or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License version 2 for more details.
|
|
*/
|
|
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#define TPIC2810_WS_COMMAND 0x44
|
|
|
|
/**
|
|
* struct tpic2810 - GPIO driver data
|
|
* @chip: GPIO controller chip
|
|
* @client: I2C device pointer
|
|
* @buffer: Buffer for device register
|
|
* @lock: Protects write sequences
|
|
*/
|
|
struct tpic2810 {
|
|
struct gpio_chip chip;
|
|
struct i2c_client *client;
|
|
u8 buffer;
|
|
struct mutex lock;
|
|
};
|
|
|
|
static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value);
|
|
|
|
static int tpic2810_get_direction(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
/* This device always output */
|
|
return 0;
|
|
}
|
|
|
|
static int tpic2810_direction_input(struct gpio_chip *chip,
|
|
unsigned offset)
|
|
{
|
|
/* This device is output only */
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int tpic2810_direction_output(struct gpio_chip *chip,
|
|
unsigned offset, int value)
|
|
{
|
|
/* This device always output */
|
|
tpic2810_set(chip, offset, value);
|
|
return 0;
|
|
}
|
|
|
|
static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits)
|
|
{
|
|
struct tpic2810 *gpio = gpiochip_get_data(chip);
|
|
u8 buffer;
|
|
int err;
|
|
|
|
mutex_lock(&gpio->lock);
|
|
|
|
buffer = gpio->buffer & ~mask;
|
|
buffer |= (mask & bits);
|
|
|
|
err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
|
|
buffer);
|
|
if (!err)
|
|
gpio->buffer = buffer;
|
|
|
|
mutex_unlock(&gpio->lock);
|
|
}
|
|
|
|
static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
|
|
{
|
|
tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0);
|
|
}
|
|
|
|
static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
|
|
unsigned long *bits)
|
|
{
|
|
tpic2810_set_mask_bits(chip, *mask, *bits);
|
|
}
|
|
|
|
static const struct gpio_chip template_chip = {
|
|
.label = "tpic2810",
|
|
.owner = THIS_MODULE,
|
|
.get_direction = tpic2810_get_direction,
|
|
.direction_input = tpic2810_direction_input,
|
|
.direction_output = tpic2810_direction_output,
|
|
.set = tpic2810_set,
|
|
.set_multiple = tpic2810_set_multiple,
|
|
.base = -1,
|
|
.ngpio = 8,
|
|
.can_sleep = true,
|
|
};
|
|
|
|
static const struct of_device_id tpic2810_of_match_table[] = {
|
|
{ .compatible = "ti,tpic2810" },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);
|
|
|
|
static int tpic2810_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct tpic2810 *gpio;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, gpio);
|
|
|
|
gpio->chip = template_chip;
|
|
gpio->chip.parent = &client->dev;
|
|
|
|
gpio->client = client;
|
|
|
|
mutex_init(&gpio->lock);
|
|
|
|
ret = gpiochip_add_data(&gpio->chip, gpio);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Unable to register gpiochip\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tpic2810_remove(struct i2c_client *client)
|
|
{
|
|
struct tpic2810 *gpio = i2c_get_clientdata(client);
|
|
|
|
gpiochip_remove(&gpio->chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id tpic2810_id_table[] = {
|
|
{ "tpic2810", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);
|
|
|
|
static struct i2c_driver tpic2810_driver = {
|
|
.driver = {
|
|
.name = "tpic2810",
|
|
.of_match_table = tpic2810_of_match_table,
|
|
},
|
|
.probe = tpic2810_probe,
|
|
.remove = tpic2810_remove,
|
|
.id_table = tpic2810_id_table,
|
|
};
|
|
module_i2c_driver(tpic2810_driver);
|
|
|
|
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
|
|
MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
|
|
MODULE_LICENSE("GPL v2");
|