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 <a...@ti.com> --- drivers/gpio/Kconfig | 8 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-tpic2810.c | 165 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 174 insertions(+) create mode 100644 drivers/gpio/gpio-tpic2810.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b60f40a..1696209 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -709,6 +709,14 @@ 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" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 548e9b5..3bc66c6 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -96,6 +96,7 @@ 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 diff --git a/drivers/gpio/gpio-tpic2810.c b/drivers/gpio/gpio-tpic2810.c new file mode 100644 index 0000000..2be828f --- /dev/null +++ b/drivers/gpio/gpio-tpic2810.c @@ -0,0 +1,165 @@ +/* + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ + * Andrew F. Davis <a...@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 inline struct tpic2810 *to_tpic2810(struct gpio_chip *chip) +{ + return container_of(chip, struct tpic2810, chip); +} + +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 = to_tpic2810(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 = to_tpic2810(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 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(&gpio->chip); + 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", + }, + .probe = tpic2810_probe, + .remove = tpic2810_remove, + .id_table = tpic2810_id_table, +}; +module_i2c_driver(tpic2810_driver); + +MODULE_AUTHOR("Andrew F. Davis <a...@ti.com>"); +MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver"); +MODULE_LICENSE("GPL v2"); -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html