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Add driver for TI TPIC2810 8-Bit LED Driver with I2C Interface. The TPIC2810 has 8 open-drain outputs that can but used to drive LEDs and other low-side switched resistive loads. Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Andrew F. Davis
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/* | ||
* 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. | ||
*/ | ||
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#include <linux/gpio/driver.h> | ||
#include <linux/i2c.h> | ||
#include <linux/module.h> | ||
#include <linux/mutex.h> | ||
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#define TPIC2810_WS_COMMAND 0x44 | ||
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/** | ||
* 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; | ||
}; | ||
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static int tpic2810_get_direction(struct gpio_chip *chip, | ||
unsigned offset) | ||
{ | ||
/* This device always output */ | ||
return 0; | ||
} | ||
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static int tpic2810_direction_input(struct gpio_chip *chip, | ||
unsigned offset) | ||
{ | ||
/* This device is output only */ | ||
return -EINVAL; | ||
} | ||
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static int tpic2810_direction_output(struct gpio_chip *chip, | ||
unsigned offset, int value) | ||
{ | ||
/* This device always output */ | ||
return 0; | ||
} | ||
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static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value) | ||
{ | ||
struct tpic2810 *gpio = gpiochip_get_data(chip); | ||
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mutex_lock(&gpio->lock); | ||
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if (value) | ||
gpio->buffer |= BIT(offset); | ||
else | ||
gpio->buffer &= ~BIT(offset); | ||
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i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND, | ||
gpio->buffer); | ||
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mutex_unlock(&gpio->lock); | ||
} | ||
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static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask, | ||
unsigned long *bits) | ||
{ | ||
struct tpic2810 *gpio = gpiochip_get_data(chip); | ||
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mutex_lock(&gpio->lock); | ||
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/* clear bits under mask */ | ||
gpio->buffer &= ~(*mask); | ||
/* set bits under mask */ | ||
gpio->buffer |= ((*mask) & (*bits)); | ||
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i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND, | ||
gpio->buffer); | ||
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mutex_unlock(&gpio->lock); | ||
} | ||
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static 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, | ||
}; | ||
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static const struct of_device_id tpic2810_of_match_table[] = { | ||
{ .compatible = "ti,tpic2810" }, | ||
{ /* sentinel */ } | ||
}; | ||
MODULE_DEVICE_TABLE(of, tpic2810_of_match_table); | ||
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static int tpic2810_probe(struct i2c_client *client, | ||
const struct i2c_device_id *id) | ||
{ | ||
struct tpic2810 *gpio; | ||
int ret; | ||
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gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL); | ||
if (!gpio) | ||
return -ENOMEM; | ||
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i2c_set_clientdata(client, gpio); | ||
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gpio->chip = template_chip; | ||
gpio->chip.parent = &client->dev; | ||
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gpio->client = client; | ||
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mutex_init(&gpio->lock); | ||
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ret = gpiochip_add_data(&gpio->chip, gpio); | ||
if (ret < 0) { | ||
dev_err(&client->dev, "Unable to register gpiochip\n"); | ||
return ret; | ||
} | ||
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return 0; | ||
} | ||
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static int tpic2810_remove(struct i2c_client *client) | ||
{ | ||
struct tpic2810 *gpio = i2c_get_clientdata(client); | ||
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gpiochip_remove(&gpio->chip); | ||
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return 0; | ||
} | ||
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static const struct i2c_device_id tpic2810_id_table[] = { | ||
{ "tpic2810", }, | ||
{ /* sentinel */ } | ||
}; | ||
MODULE_DEVICE_TABLE(i2c, tpic2810_id_table); | ||
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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); | ||
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); | ||
MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver"); | ||
MODULE_LICENSE("GPL v2"); |