[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / gpio-wm8994.c

/*
 * 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;

	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
			       WM8994_GPN_DIR, 0);
}

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");
Commit	Line	Data
2955c309	1	/*
c103de24	2	* gpiolib support for Wolfson WM8994
2955c309 MB	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
5a0e3ad6	16	#include <linux/slab.h>
2955c309 MB	17	#include <linux/module.h>
	18	#include <linux/gpio.h>
	19	#include <linux/mfd/core.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/seq_file.h>
	22
	23	#include <linux/mfd/wm8994/core.h>
	24	#include <linux/mfd/wm8994/pdata.h>
	25	#include <linux/mfd/wm8994/gpio.h>
	26	#include <linux/mfd/wm8994/registers.h>
	27
	28	struct wm8994_gpio {
	29	struct wm8994 *wm8994;
	30	struct gpio_chip gpio_chip;
	31	};
	32
	33	static inline struct wm8994_gpio to_wm8994_gpio(struct gpio_chip chip)
	34	{
	35	return container_of(chip, struct wm8994_gpio, gpio_chip);
	36	}
	37
4b666729 MB	38	static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
	39	{
	40	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	41	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	42
	43	switch (wm8994->type) {
	44	case WM8958:
	45	switch (offset) {
	46	case 1:
	47	case 2:
	48	case 3:
	49	case 4:
	50	case 6:
	51	return -EINVAL;
	52	}
	53	break;
	54	default:
	55	break;
	56	}
	57
	58	return 0;
	59	}
	60
2955c309 MB	61	static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	62	{
	63	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	64	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	65
	66	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	67	WM8994_GPN_DIR, WM8994_GPN_DIR);
	68	}
	69
	70	static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
	71	{
	72	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	73	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	74	int ret;
	75
	76	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
	77	if (ret < 0)
	78	return ret;
	79
	80	if (ret & WM8994_GPN_LVL)
	81	return 1;
	82	else
	83	return 0;
	84	}
	85
	86	static int wm8994_gpio_direction_out(struct gpio_chip *chip,
	87	unsigned offset, int value)
	88	{
	89	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	90	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	91
	92	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	93	WM8994_GPN_DIR, 0);
	94	}
	95
	96	static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	97	{
	98	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	99	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	100
	101	if (value)
	102	value = WM8994_GPN_LVL;
	103
	104	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
	105	}
	106
ddf438cf MB	107	static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	108	{
	109	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	110	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	111
	112	if (!wm8994->irq_base)
	113	return -EINVAL;
	114
	115	return wm8994->irq_base + offset;
	116	}
	117
	118
2955c309	119	#ifdef CONFIG_DEBUG_FS
d0ad5e89 MB	120	static const char *wm8994_gpio_fn(u16 fn)
	121	{
	122	switch (fn) {
	123	case WM8994_GP_FN_PIN_SPECIFIC:
	124	return "pin-specific";
	125	case WM8994_GP_FN_GPIO:
	126	return "GPIO";
	127	case WM8994_GP_FN_SDOUT:
	128	return "SDOUT";
	129	case WM8994_GP_FN_IRQ:
	130	return "IRQ";
	131	case WM8994_GP_FN_TEMPERATURE:
	132	return "Temperature";
	133	case WM8994_GP_FN_MICBIAS1_DET:
	134	return "MICBIAS1 detect";
	135	case WM8994_GP_FN_MICBIAS1_SHORT:
	136	return "MICBIAS1 short";
	137	case WM8994_GP_FN_MICBIAS2_DET:
	138	return "MICBIAS2 detect";
	139	case WM8994_GP_FN_MICBIAS2_SHORT:
	140	return "MICBIAS2 short";
	141	case WM8994_GP_FN_FLL1_LOCK:
	142	return "FLL1 lock";
	143	case WM8994_GP_FN_FLL2_LOCK:
	144	return "FLL2 lock";
	145	case WM8994_GP_FN_SRC1_LOCK:
	146	return "SRC1 lock";
	147	case WM8994_GP_FN_SRC2_LOCK:
	148	return "SRC2 lock";
	149	case WM8994_GP_FN_DRC1_ACT:
	150	return "DRC1 activity";
	151	case WM8994_GP_FN_DRC2_ACT:
	152	return "DRC2 activity";
	153	case WM8994_GP_FN_DRC3_ACT:
	154	return "DRC3 activity";
	155	case WM8994_GP_FN_WSEQ_STATUS:
	156	return "Write sequencer";
	157	case WM8994_GP_FN_FIFO_ERROR:
	158	return "FIFO error";
	159	case WM8994_GP_FN_OPCLK:
	160	return "OPCLK";
	161	case WM8994_GP_FN_THW:
	162	return "Thermal warning";
	163	case WM8994_GP_FN_DCS_DONE:
	164	return "DC servo";
	165	case WM8994_GP_FN_FLL1_OUT:
	166	return "FLL1 output";
	167	case WM8994_GP_FN_FLL2_OUT:
	168	return "FLL1 output";
	169	default:
	170	return "Unknown";
	171	}
	172	}
	173
2955c309 MB	174	static void wm8994_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	175	{
	176	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	177	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	178	int i;
	179
	180	for (i = 0; i < chip->ngpio; i++) {
	181	int gpio = i + chip->base;
	182	int reg;
	183	const char *label;
	184
	185	/* We report the GPIO even if it's not requested since
	186	* we're also reporting things like alternate
	187	* functions which apply even when the GPIO is not in
	188	* use as a GPIO.
	189	*/
	190	label = gpiochip_is_requested(chip, i);
	191	if (!label)
	192	label = "Unrequested";
	193
	194	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	195
	196	reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
	197	if (reg < 0) {
	198	dev_err(wm8994->dev,
	199	"GPIO control %d read failed: %d\n",
	200	gpio, reg);
	201	seq_printf(s, "\n");
	202	continue;
	203	}
	204
d0ad5e89 MB	205	if (reg & WM8994_GPN_DIR)
	206	seq_printf(s, "in ");
	207	else
	208	seq_printf(s, "out ");
	209
	210	if (reg & WM8994_GPN_PU)
	211	seq_printf(s, "pull up ");
	212
	213	if (reg & WM8994_GPN_PD)
	214	seq_printf(s, "pull down ");
	215
	216	if (reg & WM8994_GPN_POL)
	217	seq_printf(s, "inverted ");
	218	else
	219	seq_printf(s, "noninverted ");
	220
	221	if (reg & WM8994_GPN_OP_CFG)
	222	seq_printf(s, "open drain ");
	223	else
	224	seq_printf(s, "CMOS ");
	225
	226	seq_printf(s, "%s (%x)\n",
	227	wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
2955c309 MB	228	}
	229	}
	230	#else
	231	#define wm8994_gpio_dbg_show NULL
	232	#endif
	233
	234	static struct gpio_chip template_chip = {
	235	.label = "wm8994",
	236	.owner = THIS_MODULE,
4b666729	237	.request = wm8994_gpio_request,
2955c309 MB	238	.direction_input = wm8994_gpio_direction_in,
	239	.get = wm8994_gpio_get,
	240	.direction_output = wm8994_gpio_direction_out,
	241	.set = wm8994_gpio_set,
deb26e92	242	.to_irq = wm8994_gpio_to_irq,
2955c309 MB	243	.dbg_show = wm8994_gpio_dbg_show,
	244	.can_sleep = 1,
	245	};
	246
	247	static int __devinit wm8994_gpio_probe(struct platform_device *pdev)
	248	{
	249	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	250	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	251	struct wm8994_gpio *wm8994_gpio;
	252	int ret;
	253
	254	wm8994_gpio = kzalloc(sizeof(*wm8994_gpio), GFP_KERNEL);
	255	if (wm8994_gpio == NULL)
	256	return -ENOMEM;
	257
	258	wm8994_gpio->wm8994 = wm8994;
	259	wm8994_gpio->gpio_chip = template_chip;
	260	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
	261	wm8994_gpio->gpio_chip.dev = &pdev->dev;
	262	if (pdata && pdata->gpio_base)
	263	wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	264	else
	265	wm8994_gpio->gpio_chip.base = -1;
	266
	267	ret = gpiochip_add(&wm8994_gpio->gpio_chip);
	268	if (ret < 0) {
	269	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	270	ret);
	271	goto err;
	272	}
	273
	274	platform_set_drvdata(pdev, wm8994_gpio);
	275
	276	return ret;
	277
	278	err:
	279	kfree(wm8994_gpio);
	280	return ret;
	281	}
	282
	283	static int __devexit wm8994_gpio_remove(struct platform_device *pdev)
	284	{
	285	struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
	286	int ret;
	287
	288	ret = gpiochip_remove(&wm8994_gpio->gpio_chip);
	289	if (ret == 0)
	290	kfree(wm8994_gpio);
	291
	292	return ret;
	293	}
	294
	295	static struct platform_driver wm8994_gpio_driver = {
	296	.driver.name = "wm8994-gpio",
	297	.driver.owner = THIS_MODULE,
	298	.probe = wm8994_gpio_probe,
	299	.remove = __devexit_p(wm8994_gpio_remove),
	300	};
	301
	302	static int __init wm8994_gpio_init(void)
	303	{
	304	return platform_driver_register(&wm8994_gpio_driver);
	305	}
	306	subsys_initcall(wm8994_gpio_init);
307
308	static void __exit wm8994_gpio_exit(void)
309	{
310	platform_driver_unregister(&wm8994_gpio_driver);
311	}
312	module_exit(wm8994_gpio_exit);
313
314	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
315	MODULE_DESCRIPTION("GPIO interface for WM8994");
316	MODULE_LICENSE("GPL");
317	MODULE_ALIAS("platform:wm8994-gpio");