[net-next-2.6.git] / drivers / regulator / wm831x-isink.c

/*
 * wm831x-isink.c  --  Current sink driver for the WM831x series
 *
 * 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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>

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

#define WM831X_ISINK_MAX_NAME 7

struct wm831x_isink {
	char name[WM831X_ISINK_MAX_NAME];
	struct regulator_desc desc;
	int reg;
	struct wm831x *wm831x;
	struct regulator_dev *regulator;
};

static int wm831x_isink_enable(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	/* We have a two stage enable: first start the ISINK... */
	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
			      WM831X_CS1_ENA);
	if (ret != 0)
		return ret;

	/* ...then enable drive */
	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
			      WM831X_CS1_DRIVE);
	if (ret != 0)
		wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);

	return ret;

}

static int wm831x_isink_disable(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
	if (ret < 0)
		return ret;

	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	if (ret < 0)
		return ret;

	return ret;

}

static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	ret = wm831x_reg_read(wm831x, isink->reg);
	if (ret < 0)
		return ret;

	if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
	    (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
		return 1;
	else
		return 0;
}

static int wm831x_isink_set_current(struct regulator_dev *rdev,
				    int min_uA, int max_uA)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret, i;

	for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) {
		int val = wm831x_isinkv_values[i];
		if (min_uA >= val && val <= max_uA) {
			ret = wm831x_set_bits(wm831x, isink->reg,
					      WM831X_CS1_ISEL_MASK, i);
			return ret;
		}
	}

	return -EINVAL;
}

static int wm831x_isink_get_current(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	ret = wm831x_reg_read(wm831x, isink->reg);
	if (ret < 0)
		return ret;

	ret &= WM831X_CS1_ISEL_MASK;
	if (ret > WM831X_ISINK_MAX_ISEL)
		ret = WM831X_ISINK_MAX_ISEL;

	return wm831x_isinkv_values[ret];
}

static struct regulator_ops wm831x_isink_ops = {
	.is_enabled = wm831x_isink_is_enabled,
	.enable = wm831x_isink_enable,
	.disable = wm831x_isink_disable,
	.set_current_limit = wm831x_isink_set_current,
	.get_current_limit = wm831x_isink_get_current,
};

static irqreturn_t wm831x_isink_irq(int irq, void *data)
{
	struct wm831x_isink *isink = data;

	regulator_notifier_call_chain(isink->regulator,
				      REGULATOR_EVENT_OVER_CURRENT,
				      NULL);

	return IRQ_HANDLED;
}


static __devinit int wm831x_isink_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
	struct wm831x_isink *isink;
	int id = pdev->id % ARRAY_SIZE(pdata->isink);
	struct resource *res;
	int ret, irq;

	dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);

	if (pdata == NULL || pdata->isink[id] == NULL)
		return -ENODEV;

	isink = kzalloc(sizeof(struct wm831x_isink), GFP_KERNEL);
	if (isink == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	isink->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No I/O resource\n");
		ret = -EINVAL;
		goto err;
	}
	isink->reg = res->start;

	/* For current parts this is correct; probably need to revisit
	 * in future.
	 */
	snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
	isink->desc.name = isink->name;
	isink->desc.id = id;
	isink->desc.ops = &wm831x_isink_ops;
	isink->desc.type = REGULATOR_CURRENT;
	isink->desc.owner = THIS_MODULE;

	isink->regulator = regulator_register(&isink->desc, &pdev->dev,
					     pdata->isink[id], isink);
	if (IS_ERR(isink->regulator)) {
		ret = PTR_ERR(isink->regulator);
		dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
			id + 1, ret);
		goto err;
	}

	irq = platform_get_irq(pdev, 0);
	ret = wm831x_request_irq(wm831x, irq, wm831x_isink_irq,
				 IRQF_TRIGGER_RISING, isink->name,
				 isink);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

	platform_set_drvdata(pdev, isink);

	return 0;

err_regulator:
	regulator_unregister(isink->regulator);
err:
	kfree(isink);
	return ret;
}

static __devexit int wm831x_isink_remove(struct platform_device *pdev)
{
	struct wm831x_isink *isink = platform_get_drvdata(pdev);
	struct wm831x *wm831x = isink->wm831x;

	platform_set_drvdata(pdev, NULL);

	wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink);

	regulator_unregister(isink->regulator);
	kfree(isink);

	return 0;
}

static struct platform_driver wm831x_isink_driver = {
	.probe = wm831x_isink_probe,
	.remove = __devexit_p(wm831x_isink_remove),
	.driver		= {
		.name	= "wm831x-isink",
		.owner	= THIS_MODULE,
	},
};

static int __init wm831x_isink_init(void)
{
	int ret;
	ret = platform_driver_register(&wm831x_isink_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x ISINK driver: %d\n", ret);

	return ret;
}
subsys_initcall(wm831x_isink_init);

static void __exit wm831x_isink_exit(void)
{
	platform_driver_unregister(&wm831x_isink_driver);
}
module_exit(wm831x_isink_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown");
MODULE_DESCRIPTION("WM831x current sink driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-isink");
Commit	Line	Data
d4d6b722 MB	1	/*
	2	* wm831x-isink.c -- Current sink driver for the WM831x series
	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	#include <linux/module.h>
	15	#include <linux/moduleparam.h>
	16	#include <linux/init.h>
	17	#include <linux/bitops.h>
	18	#include <linux/err.h>
	19	#include <linux/i2c.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/regulator/driver.h>
5a0e3ad6	22	#include <linux/slab.h>
d4d6b722 MB	23
	24	#include <linux/mfd/wm831x/core.h>
	25	#include <linux/mfd/wm831x/regulator.h>
	26	#include <linux/mfd/wm831x/pdata.h>
	27
	28	#define WM831X_ISINK_MAX_NAME 7
	29
	30	struct wm831x_isink {
	31	char name[WM831X_ISINK_MAX_NAME];
	32	struct regulator_desc desc;
	33	int reg;
	34	struct wm831x *wm831x;
	35	struct regulator_dev *regulator;
	36	};
	37
	38	static int wm831x_isink_enable(struct regulator_dev *rdev)
	39	{
	40	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	41	struct wm831x *wm831x = isink->wm831x;
	42	int ret;
	43
	44	/* We have a two stage enable: first start the ISINK... */
	45	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
	46	WM831X_CS1_ENA);
	47	if (ret != 0)
	48	return ret;
	49
	50	/* ...then enable drive */
	51	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
	52	WM831X_CS1_DRIVE);
	53	if (ret != 0)
	54	wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	55
	56	return ret;
	57
	58	}
	59
	60	static int wm831x_isink_disable(struct regulator_dev *rdev)
	61	{
	62	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	63	struct wm831x *wm831x = isink->wm831x;
	64	int ret;
	65
	66	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
	67	if (ret < 0)
	68	return ret;
	69
	70	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	71	if (ret < 0)
	72	return ret;
	73
	74	return ret;
	75
	76	}
	77
	78	static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
	79	{
	80	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	81	struct wm831x *wm831x = isink->wm831x;
	82	int ret;
	83
	84	ret = wm831x_reg_read(wm831x, isink->reg);
	85	if (ret < 0)
	86	return ret;
87
88	if ((ret & (WM831X_CS1_ENA \| WM831X_CS1_DRIVE)) ==
89	(WM831X_CS1_ENA \| WM831X_CS1_DRIVE))
90	return 1;
91	else
92	return 0;
93	}
94
95	static int wm831x_isink_set_current(struct regulator_dev *rdev,
96	int min_uA, int max_uA)
97	{
98	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
99	struct wm831x *wm831x = isink->wm831x;
100	int ret, i;
101
102	for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) {
103	int val = wm831x_isinkv_values[i];
104	if (min_uA >= val && val <= max_uA) {
105	ret = wm831x_set_bits(wm831x, isink->reg,
106	WM831X_CS1_ISEL_MASK, i);
107	return ret;
108	}
109	}
110
111	return -EINVAL;
112	}
113
114	static int wm831x_isink_get_current(struct regulator_dev *rdev)
115	{
116	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
117	struct wm831x *wm831x = isink->wm831x;
118	int ret;
119
120	ret = wm831x_reg_read(wm831x, isink->reg);
121	if (ret < 0)
122	return ret;
123
124	ret &= WM831X_CS1_ISEL_MASK;
125	if (ret > WM831X_ISINK_MAX_ISEL)
126	ret = WM831X_ISINK_MAX_ISEL;
127
128	return wm831x_isinkv_values[ret];
129	}
130
131	static struct regulator_ops wm831x_isink_ops = {
132	.is_enabled = wm831x_isink_is_enabled,
133	.enable = wm831x_isink_enable,
134	.disable = wm831x_isink_disable,
135	.set_current_limit = wm831x_isink_set_current,
136	.get_current_limit = wm831x_isink_get_current,
137	};
138
139	static irqreturn_t wm831x_isink_irq(int irq, void *data)
140	{
141	struct wm831x_isink *isink = data;
142
143	regulator_notifier_call_chain(isink->regulator,
144	REGULATOR_EVENT_OVER_CURRENT,
145	NULL);
146
147	return IRQ_HANDLED;
148	}
149
150
151	static __devinit int wm831x_isink_probe(struct platform_device *pdev)
152	{
153	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
154	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
155	struct wm831x_isink *isink;
156	int id = pdev->id % ARRAY_SIZE(pdata->isink);
157	struct resource *res;
158	int ret, irq;
159
160	dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
161
162	if (pdata == NULL \|\| pdata->isink[id] == NULL)
163	return -ENODEV;
164
165	isink = kzalloc(sizeof(struct wm831x_isink), GFP_KERNEL);
166	if (isink == NULL) {
167	dev_err(&pdev->dev, "Unable to allocate private data\n");
168	return -ENOMEM;
169	}
170
e8092da9 MB	171	isink->wm831x = wm831x;
e8092da9 MB	172
d4d6b722 MB	173	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	174	if (res == NULL) {
	175	dev_err(&pdev->dev, "No I/O resource\n");
	176	ret = -EINVAL;
	177	goto err;
	178	}
	179	isink->reg = res->start;
	180
	181	/* For current parts this is correct; probably need to revisit
	182	* in future.
	183	*/
	184	snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
	185	isink->desc.name = isink->name;
	186	isink->desc.id = id;
	187	isink->desc.ops = &wm831x_isink_ops;
	188	isink->desc.type = REGULATOR_CURRENT;
	189	isink->desc.owner = THIS_MODULE;
	190
	191	isink->regulator = regulator_register(&isink->desc, &pdev->dev,
	192	pdata->isink[id], isink);
	193	if (IS_ERR(isink->regulator)) {
	194	ret = PTR_ERR(isink->regulator);
	195	dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
	196	id + 1, ret);
	197	goto err;
	198	}
	199
	200	irq = platform_get_irq(pdev, 0);
	201	ret = wm831x_request_irq(wm831x, irq, wm831x_isink_irq,
	202	IRQF_TRIGGER_RISING, isink->name,
	203	isink);
	204	if (ret != 0) {
	205	dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
	206	irq, ret);
	207	goto err_regulator;
	208	}
	209
	210	platform_set_drvdata(pdev, isink);
	211
	212	return 0;
	213
	214	err_regulator:
	215	regulator_unregister(isink->regulator);
	216	err:
	217	kfree(isink);
	218	return ret;
	219	}
	220
	221	static __devexit int wm831x_isink_remove(struct platform_device *pdev)
	222	{
	223	struct wm831x_isink *isink = platform_get_drvdata(pdev);
	224	struct wm831x *wm831x = isink->wm831x;
	225
eb66d565 DT	226	platform_set_drvdata(pdev, NULL);
eb66d565 DT	227
d4d6b722 MB	228	wm831x_free_irq(wm831x, platform_get_irq(pdev, 0), isink);
	229
	230	regulator_unregister(isink->regulator);
	231	kfree(isink);
	232
	233	return 0;
	234	}
	235
	236	static struct platform_driver wm831x_isink_driver = {
	237	.probe = wm831x_isink_probe,
	238	.remove = __devexit_p(wm831x_isink_remove),
	239	.driver = {
	240	.name = "wm831x-isink",
eb66d565	241	.owner = THIS_MODULE,
d4d6b722 MB	242	},
	243	};
	244
	245	static int __init wm831x_isink_init(void)
	246	{
	247	int ret;
	248	ret = platform_driver_register(&wm831x_isink_driver);
	249	if (ret != 0)
	250	pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
	251
	252	return ret;
	253	}
	254	subsys_initcall(wm831x_isink_init);
	255
	256	static void __exit wm831x_isink_exit(void)
	257	{
	258	platform_driver_unregister(&wm831x_isink_driver);
	259	}
	260	module_exit(wm831x_isink_exit);
	261
	262	/* Module information */
	263	MODULE_AUTHOR("Mark Brown");
	264	MODULE_DESCRIPTION("WM831x current sink driver");
	265	MODULE_LICENSE("GPL");
	266	MODULE_ALIAS("platform:wm831x-isink");