// SPDX-License-Identifier: GPL-2.0+
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/*
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* gpiolib support for different serdes chip
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*
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* Copyright (c) 2023-2028 Rockchip Electronics Co. Ltd.
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*
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* Author: luowei <lw@rock-chips.com>
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*
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*/
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#include "core.h"
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static int serdes_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int ret = 0;
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if (serdes->chip_data->gpio_ops->direction_input)
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ret = serdes->chip_data->gpio_ops->direction_input(serdes, offset);
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SERDES_DBG_MFD("%s: %s %s gpio=%d\n", __func__, dev_name(serdes->dev),
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serdes->chip_data->name, offset);
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return ret;
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}
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static int serdes_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int ret = 0;
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if (serdes->chip_data->gpio_ops->get_level)
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ret = serdes->chip_data->gpio_ops->get_level(serdes, offset);
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SERDES_DBG_MFD("%s: %s %s gpio=%d\n", __func__, dev_name(serdes->dev),
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serdes->chip_data->name, offset);
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return ret;
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}
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static void serdes_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int ret = 0;
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if (serdes->chip_data->gpio_ops->set_level)
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ret = serdes->chip_data->gpio_ops->set_level(serdes, offset, value);
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SERDES_DBG_MFD("%s: %s %s gpio=%d,val=%d\n", __func__, dev_name(serdes->dev),
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serdes->chip_data->name, offset, value);
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}
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static int serdes_gpio_direction_out(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int ret = 0;
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if (serdes->chip_data->gpio_ops->direction_output)
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ret = serdes->chip_data->gpio_ops->direction_output(serdes, offset, value);
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SERDES_DBG_MFD("%s: %s %s gpio=%d,val=%d\n", __func__, dev_name(serdes->dev),
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serdes->chip_data->name, offset, value);
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return ret;
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}
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static int serdes_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int ret = 0;
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if (serdes->chip_data->gpio_ops->to_irq)
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ret = serdes->chip_data->gpio_ops->to_irq(serdes, offset);
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SERDES_DBG_MFD("%s: %s %s gpio=%d\n", __func__, dev_name(serdes->dev),
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serdes->chip_data->name, offset);
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return ret;
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}
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static int serdes_set_config(struct gpio_chip *chip, unsigned int offset,
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unsigned long config)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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//int param = pinconf_to_config_param(config);
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int ret = 0;
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//int gpio = offset;
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if (serdes->chip_data->gpio_ops->set_config)
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ret = serdes->chip_data->gpio_ops->set_config(serdes, offset, config);
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SERDES_DBG_MFD("%s: %s %s gpio=%d,config=%d\n", __func__,
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dev_name(serdes->dev),
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serdes->chip_data->name, offset, pinconf_to_config_param(config));
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return ret;
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}
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#ifdef CONFIG_DEBUG_FS
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static void serdes_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
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{
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struct serdes_gpio *serdes_gpio = gpiochip_get_data(chip);
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struct serdes *serdes = serdes_gpio->parent->parent;
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int i = 0;
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int ret = 0;
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for (i = 0; i < chip->ngpio; i++) {
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int gpio = i + chip->base;
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const char *label, *level;
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/* We report the GPIO even if it's not requested since
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* we're also reporting things like alternate
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* functions which apply even when the GPIO is not in
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* use as a GPIO.
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*/
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label = gpiochip_is_requested(chip, i);
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if (!label)
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label = "Unrequested";
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seq_printf(s, " %s-gpio-%02d ", label, gpio);
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if (serdes->chip_data->gpio_ops->get_level)
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ret = serdes->chip_data->gpio_ops->get_level(serdes, i);
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switch (ret) {
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case SERDES_GPIO_LEVEL_HIGH:
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level = "level-high";
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break;
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case SERDES_GPIO_LEVEL_LOW:
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level = "level-low";
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break;
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default:
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level = "invalid level";
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break;
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}
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seq_printf(s, " %s\n", level);
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}
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}
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#else
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#define serdes_gpio_dbg_show NULL
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#endif
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static const struct gpio_chip serdes_gpio_chip = {
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.owner = THIS_MODULE,
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.request = gpiochip_generic_request,
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.free = gpiochip_generic_free,
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.direction_input = serdes_gpio_direction_in,
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.direction_output = serdes_gpio_direction_out,
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.get = serdes_gpio_get,
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.set = serdes_gpio_set,
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.set_config = serdes_set_config,
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.to_irq = serdes_gpio_to_irq,
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.dbg_show = serdes_gpio_dbg_show,
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.can_sleep = true,
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};
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static int serdes_gpio_probe(struct platform_device *pdev)
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{
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struct serdes_pinctrl *serdes_pinctrl = dev_get_drvdata(pdev->dev.parent);
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struct serdes *serdes = serdes_pinctrl->parent;
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struct serdes_chip_data *chip_data = serdes->chip_data;
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struct device *dev = &pdev->dev;
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struct serdes_gpio *serdes_gpio;
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const char *list_name = "gpio-ranges";
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struct of_phandle_args of_args;
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int ret;
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serdes_gpio = devm_kzalloc(&pdev->dev, sizeof(*serdes_gpio),
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GFP_KERNEL);
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if (serdes_gpio == NULL)
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return -ENOMEM;
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ret = of_parse_phandle_with_fixed_args(dev->of_node, list_name, 3, 0, &of_args);
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if (ret) {
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dev_err(dev, "Unable to parse %s list property\n",
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list_name);
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return ret;
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}
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serdes_pinctrl->gpio = serdes_gpio;
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serdes_gpio->dev = dev;
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serdes_gpio->parent = serdes_pinctrl;
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serdes_gpio->gpio_chip = serdes_gpio_chip;
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serdes_gpio->gpio_chip.parent = pdev->dev.parent;
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if (of_args.args[2]) {
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serdes_gpio->gpio_chip.base = of_args.args[1];
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serdes_gpio->gpio_chip.ngpio = of_args.args[2];
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} else {
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serdes_gpio->gpio_chip.base = -1;
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serdes_gpio->gpio_chip.ngpio = 8;
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}
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#ifdef CONFIG_OF_GPIO
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serdes_gpio->gpio_chip.of_node = serdes_gpio->dev->of_node;
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#endif
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serdes_gpio->gpio_chip.label = kasprintf(GFP_KERNEL, "%s-gpio", chip_data->name);
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/* Add gpiochip */
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ret = devm_gpiochip_add_data(&pdev->dev, &serdes_gpio->gpio_chip,
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serdes_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register serdes gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, serdes_gpio);
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dev_info(serdes_gpio->dev->parent->parent,
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"%s serdes_gpio_probe successful, base=%d, ngpio=%d\n",
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serdes->chip_data->name,
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serdes_gpio->gpio_chip.base, serdes_gpio->gpio_chip.ngpio);
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return ret;
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}
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static const struct of_device_id serdes_gpio_of_match[] = {
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{ .compatible = "rohm,bu18tl82-gpio", },
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{ .compatible = "rohm,bu18rl82-gpio", },
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{ .compatible = "maxim,max96745-gpio", },
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{ .compatible = "maxim,max96752-gpio", },
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{ .compatible = "maxim,max96755-gpio", },
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{ .compatible = "maxim,max96772-gpio", },
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{ .compatible = "rockchip,rkx111-gpio", },
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{ .compatible = "rockchip,rkx121-gpio", },
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{ .compatible = "novo,nca9539-gpio", },
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{ }
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};
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static struct platform_driver serdes_gpio_driver = {
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.driver = {
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.name = "serdes-gpio",
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.of_match_table = of_match_ptr(serdes_gpio_of_match),
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},
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.probe = serdes_gpio_probe,
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};
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static int __init serdes_gpio_init(void)
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{
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return platform_driver_register(&serdes_gpio_driver);
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}
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device_initcall(serdes_gpio_init);
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static void __exit serdes_gpio_exit(void)
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{
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platform_driver_unregister(&serdes_gpio_driver);
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}
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module_exit(serdes_gpio_exit);
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MODULE_AUTHOR("Luo Wei <lw@rock-chips.com>");
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MODULE_DESCRIPTION("display bridge interface for different serdes");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:serdes-bridge");
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