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f30e49f129
The TPS65218 supports open drain mode on its three pins, with one of them configurable also as push-pull. Use the new .set_single_ended() callback to set this up properly from the core, so the core actually see it can drive the pin(s) as open drain, and does not attempt to emulate open drain by switching the pin to an input. Acked-by: Nicolas Saenz Julienne <nicolassaenzj@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
247 lines
6.1 KiB
C
247 lines
6.1 KiB
C
/*
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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 program is free software; you can redistribute it and/or modify i t
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* under the terms of the GNU General Public License as published by th e
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* Free Software Foundation; either version 2 of the License, or (at you r
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* option) any later version.
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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/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 = tps65218_reg_read(tps65218, 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_single_ended(struct gpio_chip *gc,
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unsigned offset,
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enum single_ended_mode mode)
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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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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 (mode == LINE_MODE_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 (mode == LINE_MODE_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 (mode == LINE_MODE_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 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_single_ended = tps65218_gpio_set_single_ended,
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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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int ret;
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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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ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, tps65218_gpio);
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return ret;
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}
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static int tps65218_gpio_remove(struct platform_device *pdev)
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{
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struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&tps65218_gpio->gpio_chip);
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return 0;
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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 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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.remove = tps65218_gpio_remove,
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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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MODULE_ALIAS("platform:tps65218-gpio");
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