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![Andy Shevchenko](/assets/img/avatar_default.png)
GPIO library does copy the of_node from the parent device of the GPIO chip, there is no need to repeat this in the individual drivers. Remove these assignment all at once. For the details one may look into the of_gpio_dev_init() implementation. While at it, remove duplicate parent device assignment where it is the case. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
229 lines
5.7 KiB
C
229 lines
5.7 KiB
C
// 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 <nicolassaenzj@gmail.com>
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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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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 <nicolassaenzj@gmail.com>");
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MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
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MODULE_LICENSE("GPL v2");
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