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gpio: Add driver for TI TPIC2810
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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 authored and Linus Walleij committed Feb 10, 2016
1 parent df6df93 commit b866526
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Showing 3 changed files with 176 additions and 0 deletions.
8 changes: 8 additions & 0 deletions drivers/gpio/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -739,6 +739,14 @@ config GPIO_SX150X
8 bits: sx1508q
16 bits: sx1509q

config GPIO_TPIC2810
tristate "TPIC2810 8-Bit I2C GPO expander"
help
Say yes here to enable the GPO driver for the TI TPIC2810 chip.

To compile this driver as a module, choose M here: the module will
be called gpio-tpic2810.

endmenu

menu "MFD GPIO expanders"
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1 change: 1 addition & 0 deletions drivers/gpio/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
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167 changes: 167 additions & 0 deletions drivers/gpio/gpio-tpic2810.c
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@@ -0,0 +1,167 @@
/*
* 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 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 */
return 0;
}

static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct tpic2810 *gpio = gpiochip_get_data(chip);

mutex_lock(&gpio->lock);

if (value)
gpio->buffer |= BIT(offset);
else
gpio->buffer &= ~BIT(offset);

i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
gpio->buffer);

mutex_unlock(&gpio->lock);
}

static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask,
unsigned long *bits)
{
struct tpic2810 *gpio = gpiochip_get_data(chip);

mutex_lock(&gpio->lock);

/* clear bits under mask */
gpio->buffer &= ~(*mask);
/* set bits under mask */
gpio->buffer |= ((*mask) & (*bits));

i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
gpio->buffer);

mutex_unlock(&gpio->lock);
}

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,
};

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");

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