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183 lines
4.5 KiB
183 lines
4.5 KiB
/* |
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* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ |
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* Keerthy <[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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* Based on the TPS65218 driver |
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*/ |
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#include <linux/gpio/driver.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/lp873x.h> |
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#define BITS_PER_GPO 0x4 |
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#define LP873X_GPO_CTRL_OD 0x2 |
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struct lp873x_gpio { |
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struct gpio_chip chip; |
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struct lp873x *lp873; |
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}; |
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static int lp873x_gpio_get_direction(struct gpio_chip *chip, |
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unsigned int offset) |
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{ |
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/* This device is output only */ |
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return GPIO_LINE_DIRECTION_OUT; |
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} |
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static int lp873x_gpio_direction_input(struct gpio_chip *chip, |
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unsigned int 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 lp873x_gpio_direction_output(struct gpio_chip *chip, |
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unsigned int offset, int value) |
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{ |
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struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
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/* Set the initial value */ |
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return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, |
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BIT(offset * BITS_PER_GPO), |
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value ? BIT(offset * BITS_PER_GPO) : 0); |
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} |
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static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset) |
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{ |
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struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
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int ret, val; |
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ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val); |
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if (ret < 0) |
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return ret; |
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return val & BIT(offset * BITS_PER_GPO); |
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} |
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static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset, |
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int value) |
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{ |
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struct lp873x_gpio *gpio = gpiochip_get_data(chip); |
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regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, |
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BIT(offset * BITS_PER_GPO), |
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value ? BIT(offset * BITS_PER_GPO) : 0); |
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} |
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static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset) |
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{ |
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struct lp873x_gpio *gpio = gpiochip_get_data(gc); |
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int ret; |
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switch (offset) { |
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case 0: |
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/* No MUX Set up Needed for GPO */ |
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break; |
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case 1: |
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/* Setup the CLKIN_PIN_SEL MUX to GPO2 */ |
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ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG, |
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LP873X_CONFIG_CLKIN_PIN_SEL, 0); |
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if (ret) |
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return ret; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset, |
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unsigned long config) |
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{ |
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struct lp873x_gpio *gpio = gpiochip_get_data(gc); |
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switch (pinconf_to_config_param(config)) { |
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case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
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return regmap_update_bits(gpio->lp873->regmap, |
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LP873X_REG_GPO_CTRL, |
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BIT(offset * BITS_PER_GPO + |
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LP873X_GPO_CTRL_OD), |
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BIT(offset * BITS_PER_GPO + |
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LP873X_GPO_CTRL_OD)); |
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case PIN_CONFIG_DRIVE_PUSH_PULL: |
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return regmap_update_bits(gpio->lp873->regmap, |
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LP873X_REG_GPO_CTRL, |
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BIT(offset * BITS_PER_GPO + |
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LP873X_GPO_CTRL_OD), 0); |
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default: |
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return -ENOTSUPP; |
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} |
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} |
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static const struct gpio_chip template_chip = { |
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.label = "lp873x-gpio", |
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.owner = THIS_MODULE, |
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.request = lp873x_gpio_request, |
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.get_direction = lp873x_gpio_get_direction, |
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.direction_input = lp873x_gpio_direction_input, |
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.direction_output = lp873x_gpio_direction_output, |
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.get = lp873x_gpio_get, |
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.set = lp873x_gpio_set, |
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.set_config = lp873x_gpio_set_config, |
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.base = -1, |
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.ngpio = 2, |
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.can_sleep = true, |
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}; |
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static int lp873x_gpio_probe(struct platform_device *pdev) |
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{ |
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struct lp873x_gpio *gpio; |
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int ret; |
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gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); |
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if (!gpio) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, gpio); |
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gpio->lp873 = dev_get_drvdata(pdev->dev.parent); |
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gpio->chip = template_chip; |
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gpio->chip.parent = gpio->lp873->dev; |
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ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
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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 const struct platform_device_id lp873x_gpio_id_table[] = { |
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{ "lp873x-gpio", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table); |
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static struct platform_driver lp873x_gpio_driver = { |
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.driver = { |
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.name = "lp873x-gpio", |
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}, |
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.probe = lp873x_gpio_probe, |
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.id_table = lp873x_gpio_id_table, |
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}; |
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module_platform_driver(lp873x_gpio_driver); |
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MODULE_AUTHOR("Keerthy <[email protected]>"); |
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MODULE_DESCRIPTION("LP873X GPIO driver"); |
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MODULE_LICENSE("GPL v2");
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