164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/*
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* gpiolib support for Wolfson Arizona class devices
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*
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* Copyright 2012 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/mfd/arizona/core.h>
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#include <linux/mfd/arizona/pdata.h>
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#include <linux/mfd/arizona/registers.h>
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struct arizona_gpio {
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struct arizona *arizona;
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struct gpio_chip gpio_chip;
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};
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static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct arizona_gpio, gpio_chip);
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}
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static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
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struct arizona *arizona = arizona_gpio->arizona;
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return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
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ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
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}
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static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
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struct arizona *arizona = arizona_gpio->arizona;
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unsigned int val;
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int ret;
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ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
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if (ret < 0)
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return ret;
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if (val & ARIZONA_GPN_LVL)
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return 1;
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else
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return 0;
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}
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static int arizona_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
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struct arizona *arizona = arizona_gpio->arizona;
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if (value)
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value = ARIZONA_GPN_LVL;
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return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
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ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
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}
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static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
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struct arizona *arizona = arizona_gpio->arizona;
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if (value)
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value = ARIZONA_GPN_LVL;
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regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
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ARIZONA_GPN_LVL, value);
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}
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static struct gpio_chip template_chip = {
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.label = "arizona",
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.owner = THIS_MODULE,
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.direction_input = arizona_gpio_direction_in,
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.get = arizona_gpio_get,
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.direction_output = arizona_gpio_direction_out,
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.set = arizona_gpio_set,
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.can_sleep = 1,
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};
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static int arizona_gpio_probe(struct platform_device *pdev)
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{
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struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
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struct arizona_pdata *pdata = arizona->dev->platform_data;
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struct arizona_gpio *arizona_gpio;
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int ret;
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arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
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GFP_KERNEL);
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if (arizona_gpio == NULL)
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return -ENOMEM;
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arizona_gpio->arizona = arizona;
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arizona_gpio->gpio_chip = template_chip;
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arizona_gpio->gpio_chip.dev = &pdev->dev;
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switch (arizona->type) {
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case WM5102:
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case WM5110:
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arizona_gpio->gpio_chip.ngpio = 5;
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break;
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default:
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dev_err(&pdev->dev, "Unknown chip variant %d\n",
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arizona->type);
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return -EINVAL;
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}
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if (pdata && pdata->gpio_base)
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arizona_gpio->gpio_chip.base = pdata->gpio_base;
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else
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arizona_gpio->gpio_chip.base = -1;
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ret = gpiochip_add(&arizona_gpio->gpio_chip);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
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ret);
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goto err;
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}
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platform_set_drvdata(pdev, arizona_gpio);
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return ret;
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err:
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return ret;
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}
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static int arizona_gpio_remove(struct platform_device *pdev)
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{
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struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
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return gpiochip_remove(&arizona_gpio->gpio_chip);
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}
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static struct platform_driver arizona_gpio_driver = {
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.driver.name = "arizona-gpio",
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.driver.owner = THIS_MODULE,
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.probe = arizona_gpio_probe,
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.remove = arizona_gpio_remove,
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};
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module_platform_driver(arizona_gpio_driver);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("GPIO interface for Arizona devices");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:arizona-gpio");
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