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165 lines
3.9 KiB
165 lines
3.9 KiB
/* |
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ |
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* Andrew F. Davis <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether expressed or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License version 2 for more details. |
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*/ |
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#include <linux/gpio/driver.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#define TPIC2810_WS_COMMAND 0x44 |
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/** |
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* struct tpic2810 - GPIO driver data |
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* @chip: GPIO controller chip |
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* @client: I2C device pointer |
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* @buffer: Buffer for device register |
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* @lock: Protects write sequences |
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*/ |
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struct tpic2810 { |
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struct gpio_chip chip; |
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struct i2c_client *client; |
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u8 buffer; |
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struct mutex lock; |
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}; |
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static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value); |
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static int tpic2810_get_direction(struct gpio_chip *chip, |
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unsigned offset) |
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{ |
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/* This device always output */ |
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return GPIO_LINE_DIRECTION_OUT; |
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} |
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static int tpic2810_direction_input(struct gpio_chip *chip, |
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unsigned offset) |
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{ |
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/* This device is output only */ |
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return -EINVAL; |
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} |
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static int tpic2810_direction_output(struct gpio_chip *chip, |
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unsigned offset, int value) |
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{ |
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/* This device always output */ |
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tpic2810_set(chip, offset, value); |
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return 0; |
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} |
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static void tpic2810_set_mask_bits(struct gpio_chip *chip, u8 mask, u8 bits) |
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{ |
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struct tpic2810 *gpio = gpiochip_get_data(chip); |
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u8 buffer; |
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int err; |
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mutex_lock(&gpio->lock); |
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buffer = gpio->buffer & ~mask; |
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buffer |= (mask & bits); |
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err = i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND, |
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buffer); |
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if (!err) |
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gpio->buffer = buffer; |
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mutex_unlock(&gpio->lock); |
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} |
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static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value) |
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{ |
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tpic2810_set_mask_bits(chip, BIT(offset), value ? BIT(offset) : 0); |
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} |
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static void tpic2810_set_multiple(struct gpio_chip *chip, unsigned long *mask, |
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unsigned long *bits) |
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{ |
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tpic2810_set_mask_bits(chip, *mask, *bits); |
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} |
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static const struct gpio_chip template_chip = { |
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.label = "tpic2810", |
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.owner = THIS_MODULE, |
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.get_direction = tpic2810_get_direction, |
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.direction_input = tpic2810_direction_input, |
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.direction_output = tpic2810_direction_output, |
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.set = tpic2810_set, |
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.set_multiple = tpic2810_set_multiple, |
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.base = -1, |
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.ngpio = 8, |
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.can_sleep = true, |
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}; |
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static const struct of_device_id tpic2810_of_match_table[] = { |
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{ .compatible = "ti,tpic2810" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, tpic2810_of_match_table); |
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static int tpic2810_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct tpic2810 *gpio; |
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int ret; |
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gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL); |
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if (!gpio) |
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return -ENOMEM; |
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i2c_set_clientdata(client, gpio); |
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gpio->chip = template_chip; |
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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); |
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if (ret < 0) { |
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dev_err(&client->dev, "Unable to register gpiochip\n"); |
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return ret; |
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} |
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return 0; |
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} |
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static int tpic2810_remove(struct i2c_client *client) |
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{ |
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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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} |
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static const struct i2c_device_id tpic2810_id_table[] = { |
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{ "tpic2810", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tpic2810_id_table); |
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static struct i2c_driver tpic2810_driver = { |
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.driver = { |
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.name = "tpic2810", |
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.of_match_table = tpic2810_of_match_table, |
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}, |
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.probe = tpic2810_probe, |
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.remove = tpic2810_remove, |
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.id_table = tpic2810_id_table, |
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}; |
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module_i2c_driver(tpic2810_driver); |
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MODULE_AUTHOR("Andrew F. Davis <[email protected]>"); |
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MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver"); |
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MODULE_LICENSE("GPL v2");
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