[linux-2.6-block.git] / drivers / gpio / gpio-wm8994.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * gpiolib support for Wolfson WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/gpio/driver.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_config(struct gpio_chip *chip, unsigned int offset,
				  unsigned long config)
{
	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
	struct wm8994 *wm8994 = wm8994_gpio->wm8994;

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
				       WM8994_GPN_OP_CFG_MASK,
				       WM8994_GPN_OP_CFG);
	case PIN_CONFIG_DRIVE_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 const 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_config		= wm8994_gpio_set_config,
	.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 <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM8994");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-gpio");
Commit	Line	Data
66dbe750	1	// SPDX-License-Identifier: GPL-2.0+
2955c309	2	/*
c103de24	3	* gpiolib support for Wolfson WM8994
2955c309 MB	4	*
	5	* Copyright 2009 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	8	*
2955c309 MB	9	*/
	10
	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
2955c309	13	#include <linux/module.h>
10833c4b	14	#include <linux/gpio/driver.h>
2955c309 MB	15	#include <linux/mfd/core.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/seq_file.h>
224a1f90	18	#include <linux/regmap.h>
2955c309 MB	19
	20	#include <linux/mfd/wm8994/core.h>
	21	#include <linux/mfd/wm8994/pdata.h>
	22	#include <linux/mfd/wm8994/gpio.h>
	23	#include <linux/mfd/wm8994/registers.h>
	24
	25	struct wm8994_gpio {
	26	struct wm8994 *wm8994;
	27	struct gpio_chip gpio_chip;
	28	};
	29
4b666729 MB	30	static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)
4b666729 MB	31	{
765aa587	32	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
4b666729 MB	33	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	34
	35	switch (wm8994->type) {
	36	case WM8958:
	37	switch (offset) {
	38	case 1:
	39	case 2:
	40	case 3:
	41	case 4:
	42	case 6:
	43	return -EINVAL;
	44	}
	45	break;
	46	default:
	47	break;
	48	}
	49
	50	return 0;
	51	}
	52
2955c309 MB	53	static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
2955c309 MB	54	{
765aa587	55	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	56	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	57
	58	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	59	WM8994_GPN_DIR, WM8994_GPN_DIR);
	60	}
	61
	62	static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)
	63	{
765aa587	64	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	65	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	66	int ret;
	67
	68	ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);
	69	if (ret < 0)
	70	return ret;
	71
	72	if (ret & WM8994_GPN_LVL)
	73	return 1;
	74	else
	75	return 0;
	76	}
	77
	78	static int wm8994_gpio_direction_out(struct gpio_chip *chip,
	79	unsigned offset, int value)
	80	{
765aa587	81	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	82	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
2955c309 MB	83
8cd578b6 MB	84	if (value)
	85	value = WM8994_GPN_LVL;
	86
2955c309	87	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
8cd578b6	88	WM8994_GPN_DIR \| WM8994_GPN_LVL, value);
2955c309 MB	89	}
	90
	91	static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	92	{
765aa587	93	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	94	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	95
	96	if (value)
	97	value = WM8994_GPN_LVL;
	98
	99	wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value);
	100	}
	101
2956b5d9 MW	102	static int wm8994_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
2956b5d9 MW	103	unsigned long config)
190ea434 LW	104	{
	105	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
	106	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	107
2956b5d9 MW	108	switch (pinconf_to_config_param(config)) {
2956b5d9 MW	109	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
190ea434 LW	110	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	111	WM8994_GPN_OP_CFG_MASK,
	112	WM8994_GPN_OP_CFG);
2956b5d9	113	case PIN_CONFIG_DRIVE_PUSH_PULL:
190ea434 LW	114	return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,
	115	WM8994_GPN_OP_CFG_MASK, 0);
	116	default:
	117	break;
	118	}
	119
	120	return -ENOTSUPP;
	121	}
	122
ddf438cf MB	123	static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
ddf438cf MB	124	{
765aa587	125	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
ddf438cf MB	126	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
ddf438cf MB	127
224a1f90	128	return regmap_irq_get_virq(wm8994->irq_data, offset);
ddf438cf MB	129	}
	130
	131
2955c309	132	#ifdef CONFIG_DEBUG_FS
d0ad5e89 MB	133	static const char *wm8994_gpio_fn(u16 fn)
	134	{
	135	switch (fn) {
	136	case WM8994_GP_FN_PIN_SPECIFIC:
	137	return "pin-specific";
	138	case WM8994_GP_FN_GPIO:
	139	return "GPIO";
	140	case WM8994_GP_FN_SDOUT:
	141	return "SDOUT";
	142	case WM8994_GP_FN_IRQ:
	143	return "IRQ";
	144	case WM8994_GP_FN_TEMPERATURE:
	145	return "Temperature";
	146	case WM8994_GP_FN_MICBIAS1_DET:
	147	return "MICBIAS1 detect";
	148	case WM8994_GP_FN_MICBIAS1_SHORT:
	149	return "MICBIAS1 short";
	150	case WM8994_GP_FN_MICBIAS2_DET:
	151	return "MICBIAS2 detect";
	152	case WM8994_GP_FN_MICBIAS2_SHORT:
	153	return "MICBIAS2 short";
	154	case WM8994_GP_FN_FLL1_LOCK:
	155	return "FLL1 lock";
	156	case WM8994_GP_FN_FLL2_LOCK:
	157	return "FLL2 lock";
	158	case WM8994_GP_FN_SRC1_LOCK:
	159	return "SRC1 lock";
	160	case WM8994_GP_FN_SRC2_LOCK:
	161	return "SRC2 lock";
	162	case WM8994_GP_FN_DRC1_ACT:
	163	return "DRC1 activity";
	164	case WM8994_GP_FN_DRC2_ACT:
	165	return "DRC2 activity";
	166	case WM8994_GP_FN_DRC3_ACT:
	167	return "DRC3 activity";
	168	case WM8994_GP_FN_WSEQ_STATUS:
	169	return "Write sequencer";
	170	case WM8994_GP_FN_FIFO_ERROR:
	171	return "FIFO error";
	172	case WM8994_GP_FN_OPCLK:
	173	return "OPCLK";
	174	case WM8994_GP_FN_THW:
	175	return "Thermal warning";
	176	case WM8994_GP_FN_DCS_DONE:
	177	return "DC servo";
	178	case WM8994_GP_FN_FLL1_OUT:
	179	return "FLL1 output";
	180	case WM8994_GP_FN_FLL2_OUT:
	181	return "FLL1 output";
	182	default:
	183	return "Unknown";
	184	}
	185	}
	186
2955c309 MB	187	static void wm8994_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
2955c309 MB	188	{
765aa587	189	struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);
2955c309 MB	190	struct wm8994 *wm8994 = wm8994_gpio->wm8994;
	191	int i;
	192
	193	for (i = 0; i < chip->ngpio; i++) {
	194	int gpio = i + chip->base;
	195	int reg;
	196	const char *label;
	197
	198	/* We report the GPIO even if it's not requested since
	199	* we're also reporting things like alternate
	200	* functions which apply even when the GPIO is not in
	201	* use as a GPIO.
	202	*/
	203	label = gpiochip_is_requested(chip, i);
	204	if (!label)
	205	label = "Unrequested";
	206
	207	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
	208
	209	reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
	210	if (reg < 0) {
	211	dev_err(wm8994->dev,
	212	"GPIO control %d read failed: %d\n",
	213	gpio, reg);
	214	seq_printf(s, "\n");
	215	continue;
	216	}
	217
d0ad5e89 MB	218	if (reg & WM8994_GPN_DIR)
	219	seq_printf(s, "in ");
	220	else
	221	seq_printf(s, "out ");
	222
	223	if (reg & WM8994_GPN_PU)
	224	seq_printf(s, "pull up ");
	225
	226	if (reg & WM8994_GPN_PD)
	227	seq_printf(s, "pull down ");
	228
	229	if (reg & WM8994_GPN_POL)
	230	seq_printf(s, "inverted ");
	231	else
	232	seq_printf(s, "noninverted ");
	233
	234	if (reg & WM8994_GPN_OP_CFG)
	235	seq_printf(s, "open drain ");
	236	else
190ea434	237	seq_printf(s, "push-pull ");
d0ad5e89 MB	238
	239	seq_printf(s, "%s (%x)\n",
	240	wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg);
2955c309 MB	241	}
	242	}
	243	#else
	244	#define wm8994_gpio_dbg_show NULL
	245	#endif
	246
e35b5ab0	247	static const struct gpio_chip template_chip = {
2955c309 MB	248	.label = "wm8994",
2955c309 MB	249	.owner = THIS_MODULE,
4b666729	250	.request = wm8994_gpio_request,
2955c309 MB	251	.direction_input = wm8994_gpio_direction_in,
	252	.get = wm8994_gpio_get,
	253	.direction_output = wm8994_gpio_direction_out,
	254	.set = wm8994_gpio_set,
2956b5d9	255	.set_config = wm8994_gpio_set_config,
deb26e92	256	.to_irq = wm8994_gpio_to_irq,
2955c309	257	.dbg_show = wm8994_gpio_dbg_show,
9fb1f39e	258	.can_sleep = true,
2955c309 MB	259	};
2955c309 MB	260
3836309d	261	static int wm8994_gpio_probe(struct platform_device *pdev)
2955c309 MB	262	{
2955c309 MB	263	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
e56aee18	264	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
2955c309 MB	265	struct wm8994_gpio *wm8994_gpio;
	266	int ret;
	267
f8d203c0 MB	268	wm8994_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8994_gpio),
f8d203c0 MB	269	GFP_KERNEL);
2955c309 MB	270	if (wm8994_gpio == NULL)
	271	return -ENOMEM;
	272
	273	wm8994_gpio->wm8994 = wm8994;
	274	wm8994_gpio->gpio_chip = template_chip;
	275	wm8994_gpio->gpio_chip.ngpio = WM8994_GPIO_MAX;
58383c78	276	wm8994_gpio->gpio_chip.parent = &pdev->dev;
2955c309 MB	277	if (pdata && pdata->gpio_base)
	278	wm8994_gpio->gpio_chip.base = pdata->gpio_base;
	279	else
	280	wm8994_gpio->gpio_chip.base = -1;
	281
c87dc4e4 LD	282	ret = devm_gpiochip_add_data(&pdev->dev, &wm8994_gpio->gpio_chip,
c87dc4e4 LD	283	wm8994_gpio);
2955c309 MB	284	if (ret < 0) {
	285	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
	286	ret);
c87dc4e4	287	return ret;
2955c309 MB	288	}
	289
	290	platform_set_drvdata(pdev, wm8994_gpio);
	291
	292	return ret;
2955c309 MB	293	}
	294
	295	static struct platform_driver wm8994_gpio_driver = {
	296	.driver.name = "wm8994-gpio",
2955c309	297	.probe = wm8994_gpio_probe,
2955c309 MB	298	};
	299
	300	static int __init wm8994_gpio_init(void)
	301	{
	302	return platform_driver_register(&wm8994_gpio_driver);
	303	}
	304	subsys_initcall(wm8994_gpio_init);
	305
	306	static void __exit wm8994_gpio_exit(void)
	307	{
	308	platform_driver_unregister(&wm8994_gpio_driver);
	309	}
	310	module_exit(wm8994_gpio_exit);
	311
	312	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	313	MODULE_DESCRIPTION("GPIO interface for WM8994");
	314	MODULE_LICENSE("GPL");
	315	MODULE_ALIAS("platform:wm8994-gpio");