mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:36:40 +07:00
e35b5ab0a7
These structures are only used to copy into other structures, so declare them as const. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct gpio_chip i@p = { ... }; @ok@ identifier r.i; expression e; position p; @@ e = i@p; @bad@ position p != {r.p,ok.p}; identifier r.i; struct gpio_chip e; @@ e@i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct gpio_chip i = { ... }; // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
/*
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* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
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* Keerthy <j-keerthy@ti.com>
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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.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 0;
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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_single_ended(struct gpio_chip *gc,
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unsigned int offset,
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enum single_ended_mode mode)
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{
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struct lp873x_gpio *gpio = gpiochip_get_data(gc);
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switch (mode) {
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case LINE_MODE_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 LINE_MODE_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_single_ended = lp873x_gpio_set_single_ended,
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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 <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("LP873X GPIO driver");
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MODULE_LICENSE("GPL v2");
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