[deliverable/linux.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/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;
	}

	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;

	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",
	},
};

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