![Charles Keepax](/assets/img/avatar_default.png)
madera_gpio_chip is only used as a template so it can be marked as const. Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
207 lines
5.7 KiB
C
207 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* GPIO support for Cirrus Logic Madera codecs
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*
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* Copyright (C) 2015-2018 Cirrus Logic
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2.
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*/
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#include <linux/gpio/driver.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/madera/core.h>
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#include <linux/mfd/madera/pdata.h>
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#include <linux/mfd/madera/registers.h>
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struct madera_gpio {
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struct madera *madera;
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/* storage space for the gpio_chip we're using */
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struct gpio_chip gpio_chip;
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};
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static int madera_gpio_get_direction(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
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struct madera *madera = madera_gpio->madera;
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unsigned int reg_offset = 2 * offset;
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unsigned int val;
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int ret;
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ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
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&val);
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if (ret < 0)
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return ret;
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return !!(val & MADERA_GP1_DIR_MASK);
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}
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static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
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{
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struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
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struct madera *madera = madera_gpio->madera;
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unsigned int reg_offset = 2 * offset;
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return regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_2 + reg_offset,
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MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
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}
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static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
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struct madera *madera = madera_gpio->madera;
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unsigned int reg_offset = 2 * offset;
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unsigned int val;
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int ret;
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ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
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&val);
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if (ret < 0)
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return ret;
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return !!(val & MADERA_GP1_LVL_MASK);
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}
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static int madera_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 madera_gpio *madera_gpio = gpiochip_get_data(chip);
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struct madera *madera = madera_gpio->madera;
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unsigned int reg_offset = 2 * offset;
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unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
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int ret;
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ret = regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_2 + reg_offset,
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MADERA_GP1_DIR_MASK, 0);
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if (ret < 0)
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return ret;
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return regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_1 + reg_offset,
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MADERA_GP1_LVL_MASK, reg_val);
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}
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static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
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struct madera *madera = madera_gpio->madera;
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unsigned int reg_offset = 2 * offset;
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unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
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int ret;
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ret = regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_1 + reg_offset,
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MADERA_GP1_LVL_MASK, reg_val);
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/* set() doesn't return an error so log a warning */
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if (ret)
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dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
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MADERA_GPIO1_CTRL_1 + reg_offset, ret);
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}
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static const struct gpio_chip madera_gpio_chip = {
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.label = "madera",
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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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.get_direction = madera_gpio_get_direction,
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.direction_input = madera_gpio_direction_in,
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.get = madera_gpio_get,
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.direction_output = madera_gpio_direction_out,
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.set = madera_gpio_set,
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.set_config = gpiochip_generic_config,
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.can_sleep = true,
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};
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static int madera_gpio_probe(struct platform_device *pdev)
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{
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struct madera *madera = dev_get_drvdata(pdev->dev.parent);
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struct madera_pdata *pdata = dev_get_platdata(madera->dev);
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struct madera_gpio *madera_gpio;
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int ret;
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madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
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GFP_KERNEL);
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if (!madera_gpio)
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return -ENOMEM;
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madera_gpio->madera = madera;
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/* Construct suitable gpio_chip from the template in madera_gpio_chip */
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madera_gpio->gpio_chip = madera_gpio_chip;
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madera_gpio->gpio_chip.parent = pdev->dev.parent;
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switch (madera->type) {
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case CS47L35:
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madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
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break;
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case CS47L85:
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case WM1840:
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madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
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break;
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case CS47L90:
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case CS47L91:
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madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
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break;
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default:
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dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
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return -EINVAL;
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}
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/* We want to be usable on systems that don't use devicetree or acpi */
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if (pdata && pdata->gpio_base)
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madera_gpio->gpio_chip.base = pdata->gpio_base;
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else
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madera_gpio->gpio_chip.base = -1;
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ret = devm_gpiochip_add_data(&pdev->dev,
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&madera_gpio->gpio_chip,
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madera_gpio);
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if (ret < 0) {
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dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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return ret;
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}
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/*
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* This is part of a composite MFD device which can only be used with
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* the corresponding pinctrl driver. On all supported silicon the GPIO
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* to pinctrl mapping is fixed in the silicon, so we register it
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* explicitly instead of requiring a redundant gpio-ranges in the
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* devicetree.
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* In any case we also want to work on systems that don't use devicetree
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* or acpi.
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*/
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ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
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0, 0, madera_gpio->gpio_chip.ngpio);
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if (ret) {
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dev_dbg(&pdev->dev, "Failed to add pin range (%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 struct platform_driver madera_gpio_driver = {
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.driver = {
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.name = "madera-gpio",
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},
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.probe = madera_gpio_probe,
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};
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module_platform_driver(madera_gpio_driver);
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MODULE_SOFTDEP("pre: pinctrl-madera");
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MODULE_DESCRIPTION("GPIO interface for Madera codecs");
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MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
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MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:madera-gpio");
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