drivers/gpio/gpio-wm8994.c - linux - Git at Google

 /*
  * gpiolib support for Wolfson WM8994
  *
  * Copyright 2009 Wolfson Microelectronics PLC.
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/mfd/core.h>
 #include <linux/platform_device.h>
 #include <linux/seq_file.h>

 #include <linux/mfd/wm8994/core.h>
 #include <linux/mfd/wm8994/pdata.h>
 #include <linux/mfd/wm8994/gpio.h>
 #include <linux/mfd/wm8994/registers.h>

 struct wm8994_gpio {
 	struct wm8994 *wm8994;
 	struct gpio_chip gpio_chip;
 };

 static inline struct wm8994_gpio *to_wm8994_gpio(struct gpio_chip *chip)
 {
 	return container_of(chip, struct wm8994_gpio, gpio_chip);
 }

 static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

 	switch (wm8994->type) {
 	case WM8958:
 		switch (offset) {
 		case 1:
 		case 2:
 		case 3:
 		case 4:
 		case 6:
 			return -EINVAL;
 		}
 		break;
 	default:
 		break;
 	}

 	return 0;
 }

 static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

 	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
 			       WM8994_GPN_DIR, WM8994_GPN_DIR);
 }

 static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
 	int ret;

 	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
 	if (ret < 0)
 		return ret;

 	if (ret & WM8994_GPN_LVL)
 		return 1;
 	else
 		return 0;
 }

 static int wm8994_gpio_direction_out(struct gpio_chip *chip,
 				     unsigned offset, int value)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

 	if (value)
 		value = WM8994_GPN_LVL;

 	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
 			       WM8994_GPN_DIR | WM8994_GPN_LVL, value);
 }

 static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

 	if (value)
 		value = WM8994_GPN_LVL;

 	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
 }

 static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

 	if (!wm8994->irq_base)
 		return -EINVAL;

 	return wm8994->irq_base + offset;
 }


 #ifdef CONFIG_DEBUG_FS
 static const char *wm8994_gpio_fn(u16 fn)
 {
 	switch (fn) {
 	case WM8994_GP_FN_PIN_SPECIFIC:
 		return "pin-specific";
 	case WM8994_GP_FN_GPIO:
 		return "GPIO";
 	case WM8994_GP_FN_SDOUT:
 		return "SDOUT";
 	case WM8994_GP_FN_IRQ:
 		return "IRQ";
 	case WM8994_GP_FN_TEMPERATURE:
 		return "Temperature";
 	case WM8994_GP_FN_MICBIAS1_DET:
 		return "MICBIAS1 detect";
 	case WM8994_GP_FN_MICBIAS1_SHORT:
 		return "MICBIAS1 short";
 	case WM8994_GP_FN_MICBIAS2_DET:
 		return "MICBIAS2 detect";
 	case WM8994_GP_FN_MICBIAS2_SHORT:
 		return "MICBIAS2 short";
 	case WM8994_GP_FN_FLL1_LOCK:
 		return "FLL1 lock";
 	case WM8994_GP_FN_FLL2_LOCK:
 		return "FLL2 lock";
 	case WM8994_GP_FN_SRC1_LOCK:
 		return "SRC1 lock";
 	case WM8994_GP_FN_SRC2_LOCK:
 		return "SRC2 lock";
 	case WM8994_GP_FN_DRC1_ACT:
 		return "DRC1 activity";
 	case WM8994_GP_FN_DRC2_ACT:
 		return "DRC2 activity";
 	case WM8994_GP_FN_DRC3_ACT:
 		return "DRC3 activity";
 	case WM8994_GP_FN_WSEQ_STATUS:
 		return "Write sequencer";
 	case WM8994_GP_FN_FIFO_ERROR:
 		return "FIFO error";
 	case WM8994_GP_FN_OPCLK:
 		return "OPCLK";
 	case WM8994_GP_FN_THW:
 		return "Thermal warning";
 	case WM8994_GP_FN_DCS_DONE:
 		return "DC servo";
 	case WM8994_GP_FN_FLL1_OUT:
 		return "FLL1 output";
 	case WM8994_GP_FN_FLL2_OUT:
 		return "FLL1 output";
 	default:
 		return "Unknown";
 	}
 }

 static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
 	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
 	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
 	int i;

 	for (i = 0; i < chip->ngpio; i++) {
 		int gpio = i + chip->base;
 		int reg;
 		const char *label;

 		/* We report the GPIO even if it's not requested since
 		 * we're also reporting things like alternate
 		 * functions which apply even when the GPIO is not in
 		 * use as a GPIO.
 		 */
 		label = gpiochip_is_requested(chip, i);
 		if (!label)
 			label = "Unrequested";

 		seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);

 		reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
 		if (reg < 0) {
 			dev_err(wm8994->dev,
 				"GPIO control %d read failed: %d\n",
 				gpio, reg);
 			seq_printf(s, "\n");
 			continue;
 		}

 		if (reg & WM8994_GPN_DIR)
 			seq_printf(s, "in ");
 		else
 			seq_printf(s, "out ");

 		if (reg & WM8994_GPN_PU)
 			seq_printf(s, "pull up ");

 		if (reg & WM8994_GPN_PD)
 			seq_printf(s, "pull down ");

 		if (reg & WM8994_GPN_POL)
 			seq_printf(s, "inverted ");
 		else
 			seq_printf(s, "noninverted ");

 		if (reg & WM8994_GPN_OP_CFG)
 			seq_printf(s, "open drain ");
 		else
 			seq_printf(s, "CMOS ");

 		seq_printf(s, "%s (%x)\n",
 			   wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
 	}
 }
 #else
 #define wm8994_gpio_dbg_show NULL
 #endif

 static struct gpio_chip template_chip = {
 	.label			= "wm8994",
 	.owner			= THIS_MODULE,
 	.request		= wm8994_gpio_request,
 	.direction_input	= wm8994_gpio_direction_in,
 	.get			= wm8994_gpio_get,
 	.direction_output	= wm8994_gpio_direction_out,
 	.set			= wm8994_gpio_set,
 	.to_irq			= wm8994_gpio_to_irq,
 	.dbg_show		= wm8994_gpio_dbg_show,
 	.can_sleep		= 1,
 };

 static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
 {
 	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
 	struct wm8994_gpio *wm8994_gpio;
 	int ret;

 	wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL);
 	if (wm8994_gpio == NULL)
 		return -ENOMEM;

 	wm8994_gpio->wm8994 = wm8994;
 	wm8994_gpio->gpio_chip = template_chip;
 	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
 	wm8994_gpio->gpio_chip.dev = &pdev->dev;
 	if (pdata && pdata->gpio_base)
 		wm8994_gpio->gpio_chip.base = pdata->gpio_base;
 	else
 		wm8994_gpio->gpio_chip.base = -1;

 	ret = gpiochip_add(&wm8994_gpio->gpio_chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
 			ret);
 		goto err;
 	}

 	platform_set_drvdata(pdev, wm8994_gpio);

 	return ret;

 err:
 	kfree(wm8994_gpio);
 	return ret;
 }

 static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
 {
 	struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
 	int ret;

 	ret = gpiochip_remove(&wm8994_gpio->gpio_chip);
 	if (ret == 0)
 		kfree(wm8994_gpio);

 	return ret;
 }

 static struct platform_driver wm8994_gpio_driver = {
 	.driver.name	= "wm8994-gpio",
 	.driver.owner	= THIS_MODULE,
 	.probe		= wm8994_gpio_probe,
 	.remove		= __devexit_p(wm8994_gpio_remove),
 };

 static int __init wm8994_gpio_init(void)
 {
 	return platform_driver_register(&wm8994_gpio_driver);
 }
 subsys_initcall(wm8994_gpio_init);

 static void __exit wm8994_gpio_exit(void)
 {
 	platform_driver_unregister(&wm8994_gpio_driver);
 }
 module_exit(wm8994_gpio_exit);

 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_DESCRIPTION("GPIO interface for WM8994");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:wm8994-gpio");
	/*
	* gpiolib support for Wolfson WM8994
	*
	* Copyright 2009 Wolfson Microelectronics PLC.
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/gpio.h>
	#include <linux/mfd/core.h>
	#include <linux/platform_device.h>
	#include <linux/seq_file.h>

	#include <linux/mfd/wm8994/core.h>
	#include <linux/mfd/wm8994/pdata.h>
	#include <linux/mfd/wm8994/gpio.h>
	#include <linux/mfd/wm8994/registers.h>

	struct wm8994_gpio {
	struct wm8994 *wm8994;
	struct gpio_chip gpio_chip;
	};

	static inline struct wm8994_gpio to_wm8994_gpio(struct gpio_chip chip)
	{
	return container_of(chip, struct wm8994_gpio, gpio_chip);
	}

	static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	switch (wm8994->type) {
	case WM8958:
	switch (offset) {
	case 1:
	case 2:
	case 3:
	case 4:
	case 6:
	return -EINVAL;
	}
	break;
	default:
	break;
	}

	return 0;
	}

	static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	WM8994_GPN_DIR, WM8994_GPN_DIR);
	}

	static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	int ret;

	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
	if (ret < 0)
	return ret;

	if (ret & WM8994_GPN_LVL)
	return 1;
	else
	return 0;
	}

	static int wm8994_gpio_direction_out(struct gpio_chip *chip,
	unsigned offset, int value)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	if (value)
	value = WM8994_GPN_LVL;

	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	WM8994_GPN_DIR \| WM8994_GPN_LVL, value);
	}

	static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	if (value)
	value = WM8994_GPN_LVL;

	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
	}

	static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	if (!wm8994->irq_base)
	return -EINVAL;

	return wm8994->irq_base + offset;
	}


	#ifdef CONFIG_DEBUG_FS
	static const char *wm8994_gpio_fn(u16 fn)
	{
	switch (fn) {
	case WM8994_GP_FN_PIN_SPECIFIC:
	return "pin-specific";
	case WM8994_GP_FN_GPIO:
	return "GPIO";
	case WM8994_GP_FN_SDOUT:
	return "SDOUT";
	case WM8994_GP_FN_IRQ:
	return "IRQ";
	case WM8994_GP_FN_TEMPERATURE:
	return "Temperature";
	case WM8994_GP_FN_MICBIAS1_DET:
	return "MICBIAS1 detect";
	case WM8994_GP_FN_MICBIAS1_SHORT:
	return "MICBIAS1 short";
	case WM8994_GP_FN_MICBIAS2_DET:
	return "MICBIAS2 detect";
	case WM8994_GP_FN_MICBIAS2_SHORT:
	return "MICBIAS2 short";
	case WM8994_GP_FN_FLL1_LOCK:
	return "FLL1 lock";
	case WM8994_GP_FN_FLL2_LOCK:
	return "FLL2 lock";
	case WM8994_GP_FN_SRC1_LOCK:
	return "SRC1 lock";
	case WM8994_GP_FN_SRC2_LOCK:
	return "SRC2 lock";
	case WM8994_GP_FN_DRC1_ACT:
	return "DRC1 activity";
	case WM8994_GP_FN_DRC2_ACT:
	return "DRC2 activity";
	case WM8994_GP_FN_DRC3_ACT:
	return "DRC3 activity";
	case WM8994_GP_FN_WSEQ_STATUS:
	return "Write sequencer";
	case WM8994_GP_FN_FIFO_ERROR:
	return "FIFO error";
	case WM8994_GP_FN_OPCLK:
	return "OPCLK";
	case WM8994_GP_FN_THW:
	return "Thermal warning";
	case WM8994_GP_FN_DCS_DONE:
	return "DC servo";
	case WM8994_GP_FN_FLL1_OUT:
	return "FLL1 output";
	case WM8994_GP_FN_FLL2_OUT:
	return "FLL1 output";
	default:
	return "Unknown";
	}
	}

	static void wm8994_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	{
	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	int i;

	for (i = 0; i < chip->ngpio; i++) {
	int gpio = i + chip->base;
	int reg;
	const char *label;

	/* We report the GPIO even if it's not requested since
	* we're also reporting things like alternate
	* functions which apply even when the GPIO is not in
	* use as a GPIO.
	*/
	label = gpiochip_is_requested(chip, i);
	if (!label)
	label = "Unrequested";

	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);

	reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
	if (reg < 0) {
	dev_err(wm8994->dev,
	"GPIO control %d read failed: %d\n",
	gpio, reg);
	seq_printf(s, "\n");
	continue;
	}

	if (reg & WM8994_GPN_DIR)
	seq_printf(s, "in ");
	else
	seq_printf(s, "out ");

	if (reg & WM8994_GPN_PU)
	seq_printf(s, "pull up ");

	if (reg & WM8994_GPN_PD)
	seq_printf(s, "pull down ");

	if (reg & WM8994_GPN_POL)
	seq_printf(s, "inverted ");
	else
	seq_printf(s, "noninverted ");

	if (reg & WM8994_GPN_OP_CFG)
	seq_printf(s, "open drain ");
	else
	seq_printf(s, "CMOS ");

	seq_printf(s, "%s (%x)\n",
	wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
	}
	}
	#else
	#define wm8994_gpio_dbg_show NULL
	#endif

	static struct gpio_chip template_chip = {
	.label = "wm8994",
	.owner = THIS_MODULE,
	.request = wm8994_gpio_request,
	.direction_input = wm8994_gpio_direction_in,
	.get = wm8994_gpio_get,
	.direction_output = wm8994_gpio_direction_out,
	.set = wm8994_gpio_set,
	.to_irq = wm8994_gpio_to_irq,
	.dbg_show = wm8994_gpio_dbg_show,
	.can_sleep = 1,
	};

	static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
	{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	struct wm8994_gpio *wm8994_gpio;
	int ret;

	wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL);
	if (wm8994_gpio == NULL)
	return -ENOMEM;

	wm8994_gpio->wm8994 = wm8994;
	wm8994_gpio->gpio_chip = template_chip;
	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
	wm8994_gpio->gpio_chip.dev = &pdev->dev;
	if (pdata && pdata->gpio_base)
	wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	else
	wm8994_gpio->gpio_chip.base = -1;

	ret = gpiochip_add(&wm8994_gpio->gpio_chip);
	if (ret < 0) {
	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	ret);
	goto err;
	}

	platform_set_drvdata(pdev, wm8994_gpio);

	return ret;

	err:
	kfree(wm8994_gpio);
	return ret;
	}

	static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
	{
	struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
	int ret;

	ret = gpiochip_remove(&wm8994_gpio->gpio_chip);
	if (ret == 0)
	kfree(wm8994_gpio);

	return ret;
	}

	static struct platform_driver wm8994_gpio_driver = {
	.driver.name = "wm8994-gpio",
	.driver.owner = THIS_MODULE,
	.probe = wm8994_gpio_probe,
	.remove = __devexit_p(wm8994_gpio_remove),
	};

	static int __init wm8994_gpio_init(void)
	{
	return platform_driver_register(&wm8994_gpio_driver);
	}
	subsys_initcall(wm8994_gpio_init);

	static void __exit wm8994_gpio_exit(void)
	{
	platform_driver_unregister(&wm8994_gpio_driver);
	}
	module_exit(wm8994_gpio_exit);

	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_DESCRIPTION("GPIO interface for WM8994");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:wm8994-gpio");