[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/regmap.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;

	return regmap_irq_get_virq(wm8994->irq_data, 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 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 = devm_kzalloc(&pdev->dev, 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:
	return ret;
}

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

	return gpiochip_remove(&wm8994_gpio->gpio_chip);
}

static struct platform_driver wm8994_gpio_driver = {
	.driver.name	= "wm8994-gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= wm8994_gpio_probe,
	.remove		= 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>
224a1f90	22	#include <linux/regmap.h>
2955c309 MB	23
	24	#include <linux/mfd/wm8994/core.h>
	25	#include <linux/mfd/wm8994/pdata.h>
	26	#include <linux/mfd/wm8994/gpio.h>
	27	#include <linux/mfd/wm8994/registers.h>
	28
	29	struct wm8994_gpio {
	30	struct wm8994 *wm8994;
	31	struct gpio_chip gpio_chip;
	32	};
	33
	34	static inline struct wm8994_gpio to_wm8994_gpio(struct gpio_chip chip)
	35	{
	36	return container_of(chip, struct wm8994_gpio, gpio_chip);
	37	}
	38
4b666729 MB	39	static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
	40	{
	41	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	42	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	43
	44	switch (wm8994->type) {
	45	case WM8958:
	46	switch (offset) {
	47	case 1:
	48	case 2:
	49	case 3:
	50	case 4:
	51	case 6:
	52	return -EINVAL;
	53	}
	54	break;
	55	default:
	56	break;
	57	}
	58
	59	return 0;
	60	}
	61
2955c309 MB	62	static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	63	{
	64	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	65	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	66
	67	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	68	WM8994_GPN_DIR, WM8994_GPN_DIR);
	69	}
	70
	71	static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
	72	{
	73	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	74	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	75	int ret;
	76
	77	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
	78	if (ret < 0)
	79	return ret;
	80
	81	if (ret & WM8994_GPN_LVL)
	82	return 1;
	83	else
	84	return 0;
	85	}
	86
	87	static int wm8994_gpio_direction_out(struct gpio_chip *chip,
	88	unsigned offset, int value)
	89	{
	90	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	91	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	92
8cd578b6 MB	93	if (value)
	94	value = WM8994_GPN_LVL;
	95
2955c309	96	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
8cd578b6	97	WM8994_GPN_DIR \| WM8994_GPN_LVL, value);
2955c309 MB	98	}
	99
	100	static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	101	{
	102	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	103	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	104
	105	if (value)
	106	value = WM8994_GPN_LVL;
	107
	108	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
	109	}
	110
ddf438cf MB	111	static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	112	{
	113	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	114	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	115
224a1f90	116	return regmap_irq_get_virq(wm8994->irq_data, offset);
ddf438cf MB	117	}
	118
	119
2955c309	120	#ifdef CONFIG_DEBUG_FS
d0ad5e89 MB	121	static const char *wm8994_gpio_fn(u16 fn)
	122	{
	123	switch (fn) {
	124	case WM8994_GP_FN_PIN_SPECIFIC:
	125	return "pin-specific";
	126	case WM8994_GP_FN_GPIO:
	127	return "GPIO";
	128	case WM8994_GP_FN_SDOUT:
	129	return "SDOUT";
	130	case WM8994_GP_FN_IRQ:
	131	return "IRQ";
	132	case WM8994_GP_FN_TEMPERATURE:
	133	return "Temperature";
	134	case WM8994_GP_FN_MICBIAS1_DET:
	135	return "MICBIAS1 detect";
	136	case WM8994_GP_FN_MICBIAS1_SHORT:
	137	return "MICBIAS1 short";
	138	case WM8994_GP_FN_MICBIAS2_DET:
	139	return "MICBIAS2 detect";
	140	case WM8994_GP_FN_MICBIAS2_SHORT:
	141	return "MICBIAS2 short";
	142	case WM8994_GP_FN_FLL1_LOCK:
	143	return "FLL1 lock";
	144	case WM8994_GP_FN_FLL2_LOCK:
	145	return "FLL2 lock";
	146	case WM8994_GP_FN_SRC1_LOCK:
	147	return "SRC1 lock";
	148	case WM8994_GP_FN_SRC2_LOCK:
	149	return "SRC2 lock";
	150	case WM8994_GP_FN_DRC1_ACT:
	151	return "DRC1 activity";
	152	case WM8994_GP_FN_DRC2_ACT:
	153	return "DRC2 activity";
	154	case WM8994_GP_FN_DRC3_ACT:
	155	return "DRC3 activity";
	156	case WM8994_GP_FN_WSEQ_STATUS:
	157	return "Write sequencer";
	158	case WM8994_GP_FN_FIFO_ERROR:
	159	return "FIFO error";
	160	case WM8994_GP_FN_OPCLK:
	161	return "OPCLK";
	162	case WM8994_GP_FN_THW:
	163	return "Thermal warning";
	164	case WM8994_GP_FN_DCS_DONE:
	165	return "DC servo";
	166	case WM8994_GP_FN_FLL1_OUT:
	167	return "FLL1 output";
	168	case WM8994_GP_FN_FLL2_OUT:
	169	return "FLL1 output";
	170	default:
	171	return "Unknown";
	172	}
	173	}
	174
2955c309 MB	175	static void wm8994_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
	176	{
	177	struct wm8994_gpio *wm8994_gpio = to_wm8994_gpio(chip);
	178	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	179	int i;
	180
	181	for (i = 0; i < chip->ngpio; i++) {
	182	int gpio = i + chip->base;
	183	int reg;
	184	const char *label;
	185
	186	/* We report the GPIO even if it's not requested since
	187	* we're also reporting things like alternate
	188	* functions which apply even when the GPIO is not in
	189	* use as a GPIO.
	190	*/
	191	label = gpiochip_is_requested(chip, i);
	192	if (!label)
	193	label = "Unrequested";
	194
	195	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	196
	197	reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
	198	if (reg < 0) {
	199	dev_err(wm8994->dev,
	200	"GPIO control %d read failed: %d\n",
	201	gpio, reg);
	202	seq_printf(s, "\n");
	203	continue;
	204	}
	205
d0ad5e89 MB	206	if (reg & WM8994_GPN_DIR)
	207	seq_printf(s, "in ");
	208	else
	209	seq_printf(s, "out ");
	210
	211	if (reg & WM8994_GPN_PU)
	212	seq_printf(s, "pull up ");
	213
	214	if (reg & WM8994_GPN_PD)
	215	seq_printf(s, "pull down ");
	216
	217	if (reg & WM8994_GPN_POL)
	218	seq_printf(s, "inverted ");
	219	else
	220	seq_printf(s, "noninverted ");
	221
	222	if (reg & WM8994_GPN_OP_CFG)
	223	seq_printf(s, "open drain ");
	224	else
	225	seq_printf(s, "CMOS ");
	226
	227	seq_printf(s, "%s (%x)\n",
	228	wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
2955c309 MB	229	}
	230	}
	231	#else
	232	#define wm8994_gpio_dbg_show NULL
	233	#endif
	234
	235	static struct gpio_chip template_chip = {
	236	.label = "wm8994",
	237	.owner = THIS_MODULE,
4b666729	238	.request = wm8994_gpio_request,
2955c309 MB	239	.direction_input = wm8994_gpio_direction_in,
	240	.get = wm8994_gpio_get,
	241	.direction_output = wm8994_gpio_direction_out,
	242	.set = wm8994_gpio_set,
deb26e92	243	.to_irq = wm8994_gpio_to_irq,
2955c309 MB	244	.dbg_show = wm8994_gpio_dbg_show,
	245	.can_sleep = 1,
	246	};
	247
3836309d	248	static int wm8994_gpio_probe(struct platform_device *pdev)
2955c309 MB	249	{
	250	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	251	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	252	struct wm8994_gpio *wm8994_gpio;
	253	int ret;
	254
f8d203c0 MB	255	wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
f8d203c0 MB	256	GFP_KERNEL);
2955c309 MB	257	if (wm8994_gpio == NULL)
	258	return -ENOMEM;
	259
	260	wm8994_gpio->wm8994 = wm8994;
	261	wm8994_gpio->gpio_chip = template_chip;
	262	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
	263	wm8994_gpio->gpio_chip.dev = &pdev->dev;
	264	if (pdata && pdata->gpio_base)
	265	wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	266	else
	267	wm8994_gpio->gpio_chip.base = -1;
	268
	269	ret = gpiochip_add(&wm8994_gpio->gpio_chip);
	270	if (ret < 0) {
	271	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	272	ret);
	273	goto err;
	274	}
	275
	276	platform_set_drvdata(pdev, wm8994_gpio);
	277
	278	return ret;
	279
	280	err:
2955c309 MB	281	return ret;
	282	}
	283
206210ce	284	static int wm8994_gpio_remove(struct platform_device *pdev)
2955c309 MB	285	{
2955c309 MB	286	struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
2955c309	287
f8d203c0	288	return gpiochip_remove(&wm8994_gpio->gpio_chip);
2955c309 MB	289	}
	290
	291	static struct platform_driver wm8994_gpio_driver = {
	292	.driver.name = "wm8994-gpio",
	293	.driver.owner = THIS_MODULE,
	294	.probe = wm8994_gpio_probe,
8283c4ff	295	.remove = wm8994_gpio_remove,
2955c309 MB	296	};
	297
	298	static int __init wm8994_gpio_init(void)
	299	{
	300	return platform_driver_register(&wm8994_gpio_driver);
	301	}
	302	subsys_initcall(wm8994_gpio_init);
	303
	304	static void __exit wm8994_gpio_exit(void)
	305	{
	306	platform_driver_unregister(&wm8994_gpio_driver);
	307	}
	308	module_exit(wm8994_gpio_exit);
	309
	310	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	311	MODULE_DESCRIPTION("GPIO interface for WM8994");
	312	MODULE_LICENSE("GPL");
	313	MODULE_ALIAS("platform:wm8994-gpio");