[linux.git] / drivers / gpio / gpio-wm8994.c

/*
 * gpiolib support for Wolfson WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <[email protected]>
 *
 *  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 int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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_set_single_ended(struct gpio_chip *chip,
					unsigned int offset,
					enum single_ended_mode mode)
{
	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	switch (mode) {
	case LINE_MODE_OPEN_DRAIN:
		return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
				       WM8994_GPN_OP_CFG_MASK,
				       WM8994_GPN_OP_CFG);
	case LINE_MODE_PUSH_PULL:
		return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
				       WM8994_GPN_OP_CFG_MASK, 0);
	default:
		break;
	}

	return -ENOTSUPP;
}

static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(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 = gpiochip_get_data(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, "push-pull ");

		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,
	.set_single_ended	= wm8994_gpio_set_single_ended,
	.to_irq			= wm8994_gpio_to_irq,
	.dbg_show		= wm8994_gpio_dbg_show,
	.can_sleep		= true,
};

static int wm8994_gpio_probe(struct platform_device *pdev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
	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.parent = &pdev->dev;
	if (pdata && pdata->gpio_base)
		wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	else
		wm8994_gpio->gpio_chip.base = -1;

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

	platform_set_drvdata(pdev, wm8994_gpio);

	return ret;
}

static struct platform_driver wm8994_gpio_driver = {
	.driver.name	= "wm8994-gpio",
	.probe		= wm8994_gpio_probe,
};

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 <[email protected]>");
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 <[email protected]>
	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
4b666729 MB	34	static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
4b666729 MB	35	{
765aa587	36	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
4b666729 MB	37	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	38
	39	switch (wm8994->type) {
	40	case WM8958:
	41	switch (offset) {
	42	case 1:
	43	case 2:
	44	case 3:
	45	case 4:
	46	case 6:
	47	return -EINVAL;
	48	}
	49	break;
	50	default:
	51	break;
	52	}
	53
	54	return 0;
	55	}
	56
2955c309 MB	57	static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
2955c309 MB	58	{
765aa587	59	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	60	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	61
	62	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	63	WM8994_GPN_DIR, WM8994_GPN_DIR);
	64	}
	65
	66	static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
	67	{
765aa587	68	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	69	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	70	int ret;
	71
	72	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
	73	if (ret < 0)
	74	return ret;
	75
	76	if (ret & WM8994_GPN_LVL)
	77	return 1;
	78	else
	79	return 0;
	80	}
	81
	82	static int wm8994_gpio_direction_out(struct gpio_chip *chip,
	83	unsigned offset, int value)
	84	{
765aa587	85	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	86	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
2955c309 MB	87
8cd578b6 MB	88	if (value)
	89	value = WM8994_GPN_LVL;
	90
2955c309	91	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
8cd578b6	92	WM8994_GPN_DIR \| WM8994_GPN_LVL, value);
2955c309 MB	93	}
	94
	95	static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	96	{
765aa587	97	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	98	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	99
	100	if (value)
	101	value = WM8994_GPN_LVL;
	102
	103	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
	104	}
	105
190ea434 LW	106	static int wm8994_gpio_set_single_ended(struct gpio_chip *chip,
	107	unsigned int offset,
	108	enum single_ended_mode mode)
	109	{
	110	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
	111	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	112
	113	switch (mode) {
	114	case LINE_MODE_OPEN_DRAIN:
	115	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	116	WM8994_GPN_OP_CFG_MASK,
	117	WM8994_GPN_OP_CFG);
	118	case LINE_MODE_PUSH_PULL:
	119	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	120	WM8994_GPN_OP_CFG_MASK, 0);
	121	default:
	122	break;
	123	}
	124
	125	return -ENOTSUPP;
	126	}
	127
ddf438cf MB	128	static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
ddf438cf MB	129	{
765aa587	130	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
ddf438cf MB	131	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
ddf438cf MB	132
224a1f90	133	return regmap_irq_get_virq(wm8994->irq_data, offset);
ddf438cf MB	134	}
	135
	136
2955c309	137	#ifdef CONFIG_DEBUG_FS
d0ad5e89 MB	138	static const char *wm8994_gpio_fn(u16 fn)
	139	{
	140	switch (fn) {
	141	case WM8994_GP_FN_PIN_SPECIFIC:
	142	return "pin-specific";
	143	case WM8994_GP_FN_GPIO:
	144	return "GPIO";
	145	case WM8994_GP_FN_SDOUT:
	146	return "SDOUT";
	147	case WM8994_GP_FN_IRQ:
	148	return "IRQ";
	149	case WM8994_GP_FN_TEMPERATURE:
	150	return "Temperature";
	151	case WM8994_GP_FN_MICBIAS1_DET:
	152	return "MICBIAS1 detect";
	153	case WM8994_GP_FN_MICBIAS1_SHORT:
	154	return "MICBIAS1 short";
	155	case WM8994_GP_FN_MICBIAS2_DET:
	156	return "MICBIAS2 detect";
	157	case WM8994_GP_FN_MICBIAS2_SHORT:
	158	return "MICBIAS2 short";
	159	case WM8994_GP_FN_FLL1_LOCK:
	160	return "FLL1 lock";
	161	case WM8994_GP_FN_FLL2_LOCK:
	162	return "FLL2 lock";
	163	case WM8994_GP_FN_SRC1_LOCK:
	164	return "SRC1 lock";
	165	case WM8994_GP_FN_SRC2_LOCK:
	166	return "SRC2 lock";
	167	case WM8994_GP_FN_DRC1_ACT:
	168	return "DRC1 activity";
	169	case WM8994_GP_FN_DRC2_ACT:
	170	return "DRC2 activity";
	171	case WM8994_GP_FN_DRC3_ACT:
	172	return "DRC3 activity";
	173	case WM8994_GP_FN_WSEQ_STATUS:
	174	return "Write sequencer";
	175	case WM8994_GP_FN_FIFO_ERROR:
	176	return "FIFO error";
	177	case WM8994_GP_FN_OPCLK:
	178	return "OPCLK";
	179	case WM8994_GP_FN_THW:
	180	return "Thermal warning";
	181	case WM8994_GP_FN_DCS_DONE:
	182	return "DC servo";
	183	case WM8994_GP_FN_FLL1_OUT:
	184	return "FLL1 output";
	185	case WM8994_GP_FN_FLL2_OUT:
	186	return "FLL1 output";
	187	default:
	188	return "Unknown";
	189	}
	190	}
	191
2955c309 MB	192	static void wm8994_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
2955c309 MB	193	{
765aa587	194	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	195	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	196	int i;
	197
	198	for (i = 0; i < chip->ngpio; i++) {
	199	int gpio = i + chip->base;
	200	int reg;
	201	const char *label;
	202
	203	/* We report the GPIO even if it's not requested since
	204	* we're also reporting things like alternate
	205	* functions which apply even when the GPIO is not in
	206	* use as a GPIO.
	207	*/
	208	label = gpiochip_is_requested(chip, i);
	209	if (!label)
	210	label = "Unrequested";
	211
	212	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	213
	214	reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
	215	if (reg < 0) {
	216	dev_err(wm8994->dev,
	217	"GPIO control %d read failed: %d\n",
	218	gpio, reg);
	219	seq_printf(s, "\n");
	220	continue;
	221	}
	222
d0ad5e89 MB	223	if (reg & WM8994_GPN_DIR)
	224	seq_printf(s, "in ");
	225	else
	226	seq_printf(s, "out ");
	227
	228	if (reg & WM8994_GPN_PU)
	229	seq_printf(s, "pull up ");
	230
	231	if (reg & WM8994_GPN_PD)
	232	seq_printf(s, "pull down ");
	233
	234	if (reg & WM8994_GPN_POL)
	235	seq_printf(s, "inverted ");
	236	else
	237	seq_printf(s, "noninverted ");
	238
	239	if (reg & WM8994_GPN_OP_CFG)
	240	seq_printf(s, "open drain ");
	241	else
190ea434	242	seq_printf(s, "push-pull ");
d0ad5e89 MB	243
	244	seq_printf(s, "%s (%x)\n",
	245	wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
2955c309 MB	246	}
	247	}
	248	#else
	249	#define wm8994_gpio_dbg_show NULL
	250	#endif
	251
	252	static struct gpio_chip template_chip = {
	253	.label = "wm8994",
	254	.owner = THIS_MODULE,
4b666729	255	.request = wm8994_gpio_request,
2955c309 MB	256	.direction_input = wm8994_gpio_direction_in,
	257	.get = wm8994_gpio_get,
	258	.direction_output = wm8994_gpio_direction_out,
	259	.set = wm8994_gpio_set,
190ea434	260	.set_single_ended = wm8994_gpio_set_single_ended,
deb26e92	261	.to_irq = wm8994_gpio_to_irq,
2955c309	262	.dbg_show = wm8994_gpio_dbg_show,
9fb1f39e	263	.can_sleep = true,
2955c309 MB	264	};
2955c309 MB	265
3836309d	266	static int wm8994_gpio_probe(struct platform_device *pdev)
2955c309 MB	267	{
2955c309 MB	268	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
e56aee18	269	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
2955c309 MB	270	struct wm8994_gpio *wm8994_gpio;
	271	int ret;
	272
f8d203c0 MB	273	wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
f8d203c0 MB	274	GFP_KERNEL);
2955c309 MB	275	if (wm8994_gpio == NULL)
	276	return -ENOMEM;
	277
	278	wm8994_gpio->wm8994 = wm8994;
	279	wm8994_gpio->gpio_chip = template_chip;
	280	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
58383c78	281	wm8994_gpio->gpio_chip.parent = &pdev->dev;
2955c309 MB	282	if (pdata && pdata->gpio_base)
	283	wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	284	else
	285	wm8994_gpio->gpio_chip.base = -1;
	286
c87dc4e4 LD	287	ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip,
c87dc4e4 LD	288	wm8994_gpio);
2955c309 MB	289	if (ret < 0) {
	290	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	291	ret);
c87dc4e4	292	return ret;
2955c309 MB	293	}
	294
	295	platform_set_drvdata(pdev, wm8994_gpio);
	296
	297	return ret;
2955c309 MB	298	}
	299
	300	static struct platform_driver wm8994_gpio_driver = {
	301	.driver.name = "wm8994-gpio",
2955c309	302	.probe = wm8994_gpio_probe,
2955c309 MB	303	};
	304
	305	static int __init wm8994_gpio_init(void)
	306	{
	307	return platform_driver_register(&wm8994_gpio_driver);
	308	}
	309	subsys_initcall(wm8994_gpio_init);
	310
	311	static void __exit wm8994_gpio_exit(void)
	312	{
	313	platform_driver_unregister(&wm8994_gpio_driver);
	314	}
	315	module_exit(wm8994_gpio_exit);
	316
	317	MODULE_AUTHOR("Mark Brown <[email protected]>");
	318	MODULE_DESCRIPTION("GPIO interface for WM8994");
	319	MODULE_LICENSE("GPL");
	320	MODULE_ALIAS("platform:wm8994-gpio");