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233 lines
5.8 KiB
233 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2015 Verifone Int. |
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* |
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* Author: Nicolas Saenz Julienne <[email protected]> |
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* |
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* This driver is based on the gpio-tps65912 implementation. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/gpio/driver.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/tps65218.h> |
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struct tps65218_gpio { |
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struct tps65218 *tps65218; |
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struct gpio_chip gpio_chip; |
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}; |
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static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset) |
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{ |
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); |
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struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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unsigned int val; |
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int ret; |
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ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val); |
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if (ret) |
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return ret; |
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return !!(val & (TPS65218_ENABLE2_GPIO1 << offset)); |
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} |
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static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset, |
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int value) |
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{ |
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); |
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struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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if (value) |
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tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2, |
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TPS65218_ENABLE2_GPIO1 << offset, |
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TPS65218_ENABLE2_GPIO1 << offset, |
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TPS65218_PROTECT_L1); |
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else |
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tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2, |
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TPS65218_ENABLE2_GPIO1 << offset, |
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TPS65218_PROTECT_L1); |
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} |
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static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset, |
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int value) |
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{ |
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/* Only drives GPOs */ |
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tps65218_gpio_set(gc, offset, value); |
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return 0; |
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} |
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static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset) |
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{ |
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return -EPERM; |
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} |
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static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset) |
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{ |
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); |
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struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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int ret; |
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if (gpiochip_line_is_open_source(gc, offset)) { |
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dev_err(gc->parent, "can't work as open source\n"); |
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return -EINVAL; |
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} |
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switch (offset) { |
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case 0: |
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if (!gpiochip_line_is_open_drain(gc, offset)) { |
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dev_err(gc->parent, "GPO1 works only as open drain\n"); |
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return -EINVAL; |
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} |
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/* Disable sequencer for GPO1 */ |
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, |
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TPS65218_SEQ7_GPO1_SEQ_MASK, |
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TPS65218_PROTECT_L1); |
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if (ret) |
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return ret; |
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/* Setup GPO1 */ |
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, |
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TPS65218_CONFIG1_IO1_SEL, |
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TPS65218_PROTECT_L1); |
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if (ret) |
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return ret; |
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break; |
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case 1: |
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/* Setup GPO2 */ |
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1, |
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TPS65218_CONFIG1_IO1_SEL, |
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TPS65218_PROTECT_L1); |
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if (ret) |
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return ret; |
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break; |
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case 2: |
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if (!gpiochip_line_is_open_drain(gc, offset)) { |
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dev_err(gc->parent, "GPO3 works only as open drain\n"); |
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return -EINVAL; |
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} |
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/* Disable sequencer for GPO3 */ |
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, |
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TPS65218_SEQ7_GPO3_SEQ_MASK, |
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TPS65218_PROTECT_L1); |
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if (ret) |
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return ret; |
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/* Setup GPO3 */ |
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2, |
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TPS65218_CONFIG2_DC12_RST, |
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TPS65218_PROTECT_L1); |
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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 tps65218_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 tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); |
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struct tps65218 *tps65218 = tps65218_gpio->tps65218; |
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enum pin_config_param param = pinconf_to_config_param(config); |
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switch (offset) { |
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case 0: |
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case 2: |
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/* GPO1 is hardwired to be open drain */ |
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if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) |
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return 0; |
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return -ENOTSUPP; |
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case 1: |
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/* GPO2 is push-pull by default, can be set as open drain. */ |
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if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN) |
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return tps65218_clear_bits(tps65218, |
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TPS65218_REG_CONFIG1, |
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TPS65218_CONFIG1_GPO2_BUF, |
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TPS65218_PROTECT_L1); |
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if (param == PIN_CONFIG_DRIVE_PUSH_PULL) |
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return tps65218_set_bits(tps65218, |
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TPS65218_REG_CONFIG1, |
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TPS65218_CONFIG1_GPO2_BUF, |
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TPS65218_CONFIG1_GPO2_BUF, |
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TPS65218_PROTECT_L1); |
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return -ENOTSUPP; |
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default: |
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break; |
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} |
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return -ENOTSUPP; |
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} |
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static const struct gpio_chip template_chip = { |
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.label = "gpio-tps65218", |
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.owner = THIS_MODULE, |
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.request = tps65218_gpio_request, |
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.direction_output = tps65218_gpio_output, |
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.direction_input = tps65218_gpio_input, |
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.get = tps65218_gpio_get, |
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.set = tps65218_gpio_set, |
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.set_config = tps65218_gpio_set_config, |
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.can_sleep = true, |
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.ngpio = 3, |
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.base = -1, |
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}; |
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static int tps65218_gpio_probe(struct platform_device *pdev) |
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{ |
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struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent); |
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struct tps65218_gpio *tps65218_gpio; |
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tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio), |
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GFP_KERNEL); |
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if (!tps65218_gpio) |
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return -ENOMEM; |
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tps65218_gpio->tps65218 = tps65218; |
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tps65218_gpio->gpio_chip = template_chip; |
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tps65218_gpio->gpio_chip.parent = &pdev->dev; |
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#ifdef CONFIG_OF_GPIO |
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tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node; |
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#endif |
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return devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip, |
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tps65218_gpio); |
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} |
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static const struct of_device_id tps65218_dt_match[] = { |
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{ .compatible = "ti,tps65218-gpio" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, tps65218_dt_match); |
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static const struct platform_device_id tps65218_gpio_id_table[] = { |
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{ "tps65218-gpio", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table); |
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static struct platform_driver tps65218_gpio_driver = { |
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.driver = { |
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.name = "tps65218-gpio", |
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.of_match_table = of_match_ptr(tps65218_dt_match) |
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}, |
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.probe = tps65218_gpio_probe, |
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.id_table = tps65218_gpio_id_table, |
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}; |
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module_platform_driver(tps65218_gpio_driver); |
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MODULE_AUTHOR("Nicolas Saenz Julienne <[email protected]>"); |
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MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:tps65218-gpio");
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