[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / wm831x-gpio.c

/*
 * wm831x-gpio.c  --  gpiolib support for Wolfson WM831x PMICs
 *
 * 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/module.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/mfd/wm831x/gpio.h>

#define WM831X_GPIO_MAX 16

struct wm831x_gpio {
	struct wm831x *wm831x;
	struct gpio_chip gpio_chip;
};

static inline struct wm831x_gpio *to_wm831x_gpio(struct gpio_chip *chip)
{
	return container_of(chip, struct wm831x_gpio, gpio_chip);
}

static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
			       WM831X_GPN_DIR | WM831X_GPN_TRI,
			       WM831X_GPN_DIR);
}

static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int ret;

	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	if (ret < 0)
		return ret;

	if (ret & 1 << offset)
		return 1;
	else
		return 0;
}

static int wm831x_gpio_direction_out(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
			       WM831X_GPN_DIR | WM831X_GPN_TRI, 0);
}

static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;

	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
			value << offset);
}

#ifdef CONFIG_DEBUG_FS
static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int i;

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

		/* 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 = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
		if (reg < 0) {
			dev_err(wm831x->dev,
				"GPIO control %d read failed: %d\n",
				gpio, reg);
			seq_printf(s, "\n");
			continue;
		}

		switch (reg & WM831X_GPN_PULL_MASK) {
		case WM831X_GPIO_PULL_NONE:
			pull = "nopull";
			break;
		case WM831X_GPIO_PULL_DOWN:
			pull = "pulldown";
			break;
		case WM831X_GPIO_PULL_UP:
			pull = "pullup";
		default:
			pull = "INVALID PULL";
			break;
		}

		switch (i + 1) {
		case 1 ... 3:
		case 7 ... 9:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "VPMIC";
			else
				powerdomain = "DBVDD";
			break;

		case 4 ... 6:
		case 10 ... 12:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "SYSVDD";
			else
				powerdomain = "DBVDD";
			break;

		case 13 ... 16:
			powerdomain = "TPVDD";
			break;

		default:
			BUG();
			break;
		}

		seq_printf(s, " %s %s %s %s%s\n"
			   "                                  %s%s (0x%4x)\n",
			   reg & WM831X_GPN_DIR ? "in" : "out",
			   wm831x_gpio_get(chip, i) ? "high" : "low",
			   pull,
			   powerdomain,
			   reg & WM831X_GPN_POL ? " inverted" : "",
			   reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
			   reg & WM831X_GPN_TRI ? " tristated" : "",
			   reg);
	}
}
#else
#define wm831x_gpio_dbg_show NULL
#endif

static struct gpio_chip template_chip = {
	.label			= "wm831x",
	.owner			= THIS_MODULE,
	.direction_input	= wm831x_gpio_direction_in,
	.get			= wm831x_gpio_get,
	.direction_output	= wm831x_gpio_direction_out,
	.set			= wm831x_gpio_set,
	.dbg_show		= wm831x_gpio_dbg_show,
	.can_sleep		= 1,
};

static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	struct wm831x_gpio *wm831x_gpio;
	int ret;

	wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
	if (wm831x_gpio == NULL)
		return -ENOMEM;

	wm831x_gpio->wm831x = wm831x;
	wm831x_gpio->gpio_chip = template_chip;
	wm831x_gpio->gpio_chip.ngpio = WM831X_GPIO_MAX;
	wm831x_gpio->gpio_chip.dev = &pdev->dev;
	if (pdata && pdata->gpio_base)
		wm831x_gpio->gpio_chip.base = pdata->gpio_base;
	else
		wm831x_gpio->gpio_chip.base = -1;

	ret = gpiochip_add(&wm831x_gpio->gpio_chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
			ret);
		goto err;
	}

	platform_set_drvdata(pdev, wm831x_gpio);

	return ret;

err:
	kfree(wm831x_gpio);
	return ret;
}

static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
{
	struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
	int ret;

	ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
	if (ret == 0)
		kfree(wm831x_gpio);

	return ret;
}

static struct platform_driver wm831x_gpio_driver = {
	.driver.name	= "wm831x-gpio",
	.driver.owner	= THIS_MODULE,
	.probe		= wm831x_gpio_probe,
	.remove		= __devexit_p(wm831x_gpio_remove),
};

static int __init wm831x_gpio_init(void)
{
	return platform_driver_register(&wm831x_gpio_driver);
}
subsys_initcall(wm831x_gpio_init);

static void __exit wm831x_gpio_exit(void)
{
	platform_driver_unregister(&wm831x_gpio_driver);
}
module_exit(wm831x_gpio_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-gpio");
Commit	Line	Data
e4b736f1 MB	1	/*
	2	* wm831x-gpio.c -- gpiolib support for Wolfson WM831x PMICs
	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>
	16	#include <linux/module.h>
	17	#include <linux/gpio.h>
	18	#include <linux/mfd/core.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/seq_file.h>
	21
	22	#include <linux/mfd/wm831x/core.h>
	23	#include <linux/mfd/wm831x/pdata.h>
	24	#include <linux/mfd/wm831x/gpio.h>
	25
	26	#define WM831X_GPIO_MAX 16
	27
	28	struct wm831x_gpio {
	29	struct wm831x *wm831x;
	30	struct gpio_chip gpio_chip;
	31	};
	32
	33	static inline struct wm831x_gpio to_wm831x_gpio(struct gpio_chip chip)
	34	{
	35	return container_of(chip, struct wm831x_gpio, gpio_chip);
	36	}
	37
	38	static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
	39	{
	40	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	41	struct wm831x *wm831x = wm831x_gpio->wm831x;
	42
	43	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
	44	WM831X_GPN_DIR \| WM831X_GPN_TRI,
	45	WM831X_GPN_DIR);
	46	}
	47
	48	static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)
	49	{
	50	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
	51	struct wm831x *wm831x = wm831x_gpio->wm831x;
	52	int ret;
	53
	54	ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
	55	if (ret < 0)
	56	return ret;
	57
	58	if (ret & 1 << offset)
	59	return 1;
	60	else
	61	return 0;
	62	}
	63
	64	static int wm831x_gpio_direction_out(struct gpio_chip *chip,
65	unsigned offset, int value)
66	{
67	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
68	struct wm831x *wm831x = wm831x_gpio->wm831x;
69
70	return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,
71	WM831X_GPN_DIR \| WM831X_GPN_TRI, 0);
72	}
73
74	static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
75	{
76	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
77	struct wm831x *wm831x = wm831x_gpio->wm831x;
78
79	wm831x_set_bits(wm831x, WM831X_GPIO_LEVEL, 1 << offset,
80	value << offset);
81	}
82
83	#ifdef CONFIG_DEBUG_FS
84	static void wm831x_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
85	{
86	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);
87	struct wm831x *wm831x = wm831x_gpio->wm831x;
88	int i;
89
90	for (i = 0; i < chip->ngpio; i++) {
91	int gpio = i + chip->base;
92	int reg;
93	const char label, pull, *powerdomain;
94
95	/* We report the GPIO even if it's not requested since
96	* we're also reporting things like alternate
97	* functions which apply even when the GPIO is not in
98	* use as a GPIO.
99	*/
100	label = gpiochip_is_requested(chip, i);
101	if (!label)
102	label = "Unrequested";
103
104	seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
105
106	reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
107	if (reg < 0) {
108	dev_err(wm831x->dev,
109	"GPIO control %d read failed: %d\n",
110	gpio, reg);
111	seq_printf(s, "\n");
112	continue;
113	}
114
115	switch (reg & WM831X_GPN_PULL_MASK) {
116	case WM831X_GPIO_PULL_NONE:
117	pull = "nopull";
118	break;
119	case WM831X_GPIO_PULL_DOWN:
120	pull = "pulldown";
121	break;
122	case WM831X_GPIO_PULL_UP:
123	pull = "pullup";
124	default:
125	pull = "INVALID PULL";
126	break;
127	}
128
129	switch (i + 1) {
130	case 1 ... 3:
131	case 7 ... 9:
132	if (reg & WM831X_GPN_PWR_DOM)
133	powerdomain = "VPMIC";
134	else
135	powerdomain = "DBVDD";
136	break;
137
138	case 4 ... 6:
139	case 10 ... 12:
140	if (reg & WM831X_GPN_PWR_DOM)
141	powerdomain = "SYSVDD";
142	else
143	powerdomain = "DBVDD";
144	break;
145
146	case 13 ... 16:
147	powerdomain = "TPVDD";
148	break;
149
150	default:
151	BUG();
152	break;
153	}
154
155	seq_printf(s, " %s %s %s %s%s\n"
156	" %s%s (0x%4x)\n",
157	reg & WM831X_GPN_DIR ? "in" : "out",
158	wm831x_gpio_get(chip, i) ? "high" : "low",
159	pull,
160	powerdomain,
161	reg & WM831X_GPN_POL ? " inverted" : "",
162	reg & WM831X_GPN_OD ? "open-drain" : "CMOS",
163	reg & WM831X_GPN_TRI ? " tristated" : "",
164	reg);
165	}
166	}
167	#else
168	#define wm831x_gpio_dbg_show NULL
169	#endif
170
171	static struct gpio_chip template_chip = {
172	.label = "wm831x",
173	.owner = THIS_MODULE,
174	.direction_input = wm831x_gpio_direction_in,
175	.get = wm831x_gpio_get,
176	.direction_output = wm831x_gpio_direction_out,
177	.set = wm831x_gpio_set,
178	.dbg_show = wm831x_gpio_dbg_show,
179	.can_sleep = 1,
180	};
181
182	static int __devinit wm831x_gpio_probe(struct platform_device *pdev)
183	{
184	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
185	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
186	struct wm831x_gpio *wm831x_gpio;
187	int ret;
188
189	wm831x_gpio = kzalloc(sizeof(*wm831x_gpio), GFP_KERNEL);
190	if (wm831x_gpio == NULL)
191	return -ENOMEM;
192
193	wm831x_gpio->wm831x = wm831x;
194	wm831x_gpio->gpio_chip = template_chip;
195	wm831x_gpio->gpio_chip.ngpio = WM831X_GPIO_MAX;
196	wm831x_gpio->gpio_chip.dev = &pdev->dev;
197	if (pdata && pdata->gpio_base)
198	wm831x_gpio->gpio_chip.base = pdata->gpio_base;
199	else
200	wm831x_gpio->gpio_chip.base = -1;
201
202	ret = gpiochip_add(&wm831x_gpio->gpio_chip);
203	if (ret < 0) {
204	dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
205	ret);
206	goto err;
207	}
208
209	platform_set_drvdata(pdev, wm831x_gpio);
210
211	return ret;
212
213	err:
214	kfree(wm831x_gpio);
215	return ret;
216	}
217
218	static int __devexit wm831x_gpio_remove(struct platform_device *pdev)
219	{
220	struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
221	int ret;
222
223	ret = gpiochip_remove(&wm831x_gpio->gpio_chip);
224	if (ret == 0)
225	kfree(wm831x_gpio);
226
227	return ret;
228	}
229
230	static struct platform_driver wm831x_gpio_driver = {
231	.driver.name = "wm831x-gpio",
232	.driver.owner = THIS_MODULE,
233	.probe = wm831x_gpio_probe,
234	.remove = __devexit_p(wm831x_gpio_remove),
235	};
236
237	static int __init wm831x_gpio_init(void)
238	{
239	return platform_driver_register(&wm831x_gpio_driver);
240	}
241	subsys_initcall(wm831x_gpio_init);
242
243	static void __exit wm831x_gpio_exit(void)
244	{
245	platform_driver_unregister(&wm831x_gpio_driver);
246	}
247	module_exit(wm831x_gpio_exit);
248
249	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
250	MODULE_DESCRIPTION("GPIO interface for WM831x PMICs");
251	MODULE_LICENSE("GPL");
252	MODULE_ALIAS("platform:wm831x-gpio");