197 lines
4.9 KiB
C
Executable File
197 lines
4.9 KiB
C
Executable File
/*
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* GPIO support for Cirrus Logic Madera codecs
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*
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* Copyright 2015-2017 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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/gpio.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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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 val;
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int ret;
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ret = regmap_read(madera->regmap,
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MADERA_GPIO1_CTRL_2 + (2 * offset), &val);
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if (ret < 0)
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return ret;
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return (val & MADERA_GP1_DIR_MASK) >> MADERA_GP1_DIR_SHIFT;
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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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return regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_2 + (2 * 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 val;
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int ret;
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ret = regmap_read(madera->regmap,
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MADERA_GPIO1_CTRL_1 + (2 * offset), &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 regval;
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int ret;
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if (value)
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regval = MADERA_GP1_LVL;
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else
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regval = 0;
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ret = regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_2 + (2 * 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 + (2 * offset),
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MADERA_GP1_LVL_MASK, regval);
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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 regval;
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int ret;
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if (value)
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regval = MADERA_GP1_LVL;
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else
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regval = 0;
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ret = regmap_update_bits(madera->regmap,
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MADERA_GPIO1_CTRL_1 + (2 * offset),
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MADERA_GP1_LVL_MASK, regval);
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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 + (2 * offset), ret);
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}
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static const struct gpio_chip template_chip = {
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.label = "madera",
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.owner = THIS_MODULE,
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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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.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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madera_gpio->gpio_chip = template_chip;
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madera_gpio->gpio_chip.parent = &pdev->dev;
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if (IS_ENABLED(CONFIG_OF_GPIO))
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madera_gpio->gpio_chip.of_node = madera->dev->of_node;
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switch (madera->type) {
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case CS47L15:
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madera_gpio->gpio_chip.ngpio = CS47L15_NUM_GPIOS;
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break;
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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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case CS47L92:
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case CS47L93:
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madera_gpio->gpio_chip.ngpio = CS47L92_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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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, &madera_gpio->gpio_chip,
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madera_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 struct platform_driver madera_gpio_driver = {
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.driver = {
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.name = "madera-gpio",
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.owner = THIS_MODULE,
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.suppress_bind_attrs = true,
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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_DESCRIPTION("GPIO interface for Madera codecs");
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MODULE_AUTHOR("Nariman Poushin <nariman@opensource.wolfsonmicro.com>");
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MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.wolfsonmicro.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:madera-gpio");
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