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![Zhu Wang](/assets/img/avatar_default.png)
The driver depends on CONFIG_OF, so it is not necessary to use of_match_ptr() here. Even for drivers that do not depend on CONFIG_OF, it's almost always better to leave out the of_match_ptr(), since the only thing it can possibly do is to save a few bytes of .text if a driver can be used both with and without it. Hence we remove of_match_ptr(). Signed-off-by: Zhu Wang <wangzhu9@huawei.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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 = 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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