[mirror_ubuntu-artful-kernel.git] / drivers / regulator / pcf50633-regulator.c

/* NXP PCF50633 PMIC Driver
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Balaji Rao <balajirrao@openmoko.org>
 * All rights reserved.
 *
 * Broken down from monstrous PCF50633 driver mainly by
 * Harald Welte and Andy Green and Werner Almesberger
 *
 *  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/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/platform_device.h>

#include <linux/mfd/pcf50633/core.h>
#include <linux/mfd/pcf50633/pmic.h>

#define PCF50633_REGULATOR(_name, _id) 		\
	{					\
		.name = _name, 			\
		.id = _id,			\
		.ops = &pcf50633_regulator_ops,	\
		.type = REGULATOR_VOLTAGE, 	\
		.owner = THIS_MODULE, 		\
	}

static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
	[PCF50633_REGULATOR_AUTO]	= PCF50633_REG_AUTOOUT,
	[PCF50633_REGULATOR_DOWN1]	= PCF50633_REG_DOWN1OUT,
	[PCF50633_REGULATOR_DOWN2]	= PCF50633_REG_DOWN2OUT,
	[PCF50633_REGULATOR_MEMLDO]	= PCF50633_REG_MEMLDOOUT,
	[PCF50633_REGULATOR_LDO1]	= PCF50633_REG_LDO1OUT,
	[PCF50633_REGULATOR_LDO2]	= PCF50633_REG_LDO2OUT,
	[PCF50633_REGULATOR_LDO3]	= PCF50633_REG_LDO3OUT,
	[PCF50633_REGULATOR_LDO4]	= PCF50633_REG_LDO4OUT,
	[PCF50633_REGULATOR_LDO5]	= PCF50633_REG_LDO5OUT,
	[PCF50633_REGULATOR_LDO6]	= PCF50633_REG_LDO6OUT,
	[PCF50633_REGULATOR_HCLDO]	= PCF50633_REG_HCLDOOUT,
};

/* Bits from voltage value */
static u8 auto_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 1800)
		return 0;
	if (millivolts > 3800)
		return 0xff;

	millivolts -= 625;

	return millivolts / 25;
}

static u8 down_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 625)
		return 0;
	else if (millivolts > 3000)
		return 0xff;

	millivolts -= 625;

	return millivolts / 25;
}

static u8 ldo_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 900)
		return 0;
	else if (millivolts > 3600)
		return 0x1f;

	millivolts -= 900;
	return millivolts / 100;
}

/* Obtain voltage value from bits */
static unsigned int auto_voltage_value(u8 bits)
{
	if (bits < 0x2f)
		return 0;

	return 625 + (bits * 25);
}


static unsigned int down_voltage_value(u8 bits)
{
	return 625 + (bits * 25);
}


static unsigned int ldo_voltage_value(u8 bits)
{
	bits &= 0x1f;

	return 900 + (bits * 100);
}

static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
						int min_uV, int max_uV)
{
	struct pcf50633 *pcf;
	int regulator_id, millivolts;
	u8 volt_bits, regnr;

	pcf = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	millivolts = min_uV / 1000;

	regnr = pcf50633_regulator_registers[regulator_id];

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
		volt_bits = auto_voltage_bits(millivolts);
		break;
	case PCF50633_REGULATOR_DOWN1:
		volt_bits = down_voltage_bits(millivolts);
		break;
	case PCF50633_REGULATOR_DOWN2:
		volt_bits = down_voltage_bits(millivolts);
		break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
		volt_bits = ldo_voltage_bits(millivolts);
		break;
	default:
		return -EINVAL;
	}

	return pcf50633_reg_write(pcf, regnr, volt_bits);
}

static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
{
	struct pcf50633 *pcf;
	int regulator_id, millivolts, volt_bits;
	u8 regnr;

	pcf = rdev_get_drvdata(rdev);;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	regnr = pcf50633_regulator_registers[regulator_id];

	volt_bits = pcf50633_reg_read(pcf, regnr);
	if (volt_bits < 0)
		return -1;

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
		millivolts = auto_voltage_value(volt_bits);
		break;
	case PCF50633_REGULATOR_DOWN1:
		millivolts = down_voltage_value(volt_bits);
		break;
	case PCF50633_REGULATOR_DOWN2:
		millivolts = down_voltage_value(volt_bits);
		break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
		millivolts = ldo_voltage_value(volt_bits);
		break;
	default:
		return -EINVAL;
	}

	return millivolts * 1000;
}

static int pcf50633_regulator_enable(struct regulator_dev *rdev)
{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id;
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	/* The *ENA register is always one after the *OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
						       PCF50633_REGULATOR_ON);
}

static int pcf50633_regulator_disable(struct regulator_dev *rdev)
{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id;
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	/* the *ENA register is always one after the *OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_set_bit_mask(pcf, regnr,
					PCF50633_REGULATOR_ON, 0);
}

static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
	int regulator_id = rdev_get_id(rdev);
	u8 regnr;

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	/* the *ENA register is always one after the *OUT register */
	regnr = pcf50633_regulator_registers[regulator_id] + 1;

	return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
}

static struct regulator_ops pcf50633_regulator_ops = {
	.set_voltage = pcf50633_regulator_set_voltage,
	.get_voltage = pcf50633_regulator_get_voltage,
	.enable = pcf50633_regulator_enable,
	.disable = pcf50633_regulator_disable,
	.is_enabled = pcf50633_regulator_is_enabled,
};

static struct regulator_desc regulators[] = {
	[PCF50633_REGULATOR_AUTO] =
		PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
	[PCF50633_REGULATOR_DOWN1] =
		PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
	[PCF50633_REGULATOR_DOWN2] =
		PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
	[PCF50633_REGULATOR_LDO1] =
		PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
	[PCF50633_REGULATOR_LDO2] =
		PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
	[PCF50633_REGULATOR_LDO3] =
		PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
	[PCF50633_REGULATOR_LDO4] =
		PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
	[PCF50633_REGULATOR_LDO5] =
		PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
	[PCF50633_REGULATOR_LDO6] =
		PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
	[PCF50633_REGULATOR_HCLDO] =
		PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
	[PCF50633_REGULATOR_MEMLDO] =
		PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
};

static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
{
	struct regulator_dev *rdev;
	struct pcf50633 *pcf;

	/* Already set by core driver */
	pcf = platform_get_drvdata(pdev);

	rdev = regulator_register(&regulators[pdev->id], &pdev->dev, pcf);
	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	if (pcf->pdata->regulator_registered)
		pcf->pdata->regulator_registered(pcf, pdev->id);

	return 0;
}

static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);

	return 0;
}

static struct platform_driver pcf50633_regulator_driver = {
	.driver = {
		.name = "pcf50633-regltr",
	},
	.probe = pcf50633_regulator_probe,
	.remove = __devexit_p(pcf50633_regulator_remove),
};

static int __init pcf50633_regulator_init(void)
{
	return platform_driver_register(&pcf50633_regulator_driver);
}
module_init(pcf50633_regulator_init);

static void __exit pcf50633_regulator_exit(void)
{
	platform_driver_unregister(&pcf50633_regulator_driver);
}
module_exit(pcf50633_regulator_exit);

MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
MODULE_DESCRIPTION("PCF50633 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcf50633-regulator");
Commit	Line	Data
5ec271e7 BR	1	/* NXP PCF50633 PMIC Driver
	2	*
	3	* (C) 2006-2008 by Openmoko, Inc.
	4	* Author: Balaji Rao <balajirrao@openmoko.org>
	5	* All rights reserved.
	6	*
	7	* Broken down from monstrous PCF50633 driver mainly by
	8	* Harald Welte and Andy Green and Werner Almesberger
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/device.h>
	21	#include <linux/err.h>
	22	#include <linux/platform_device.h>
	23
	24	#include <linux/mfd/pcf50633/core.h>
	25	#include <linux/mfd/pcf50633/pmic.h>
	26
	27	#define PCF50633_REGULATOR(_name, _id) \
	28	{ \
	29	.name = _name, \
	30	.id = _id, \
	31	.ops = &pcf50633_regulator_ops, \
	32	.type = REGULATOR_VOLTAGE, \
	33	.owner = THIS_MODULE, \
	34	}
	35
	36	static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
	37	[PCF50633_REGULATOR_AUTO] = PCF50633_REG_AUTOOUT,
	38	[PCF50633_REGULATOR_DOWN1] = PCF50633_REG_DOWN1OUT,
	39	[PCF50633_REGULATOR_DOWN2] = PCF50633_REG_DOWN2OUT,
	40	[PCF50633_REGULATOR_MEMLDO] = PCF50633_REG_MEMLDOOUT,
	41	[PCF50633_REGULATOR_LDO1] = PCF50633_REG_LDO1OUT,
	42	[PCF50633_REGULATOR_LDO2] = PCF50633_REG_LDO2OUT,
	43	[PCF50633_REGULATOR_LDO3] = PCF50633_REG_LDO3OUT,
	44	[PCF50633_REGULATOR_LDO4] = PCF50633_REG_LDO4OUT,
	45	[PCF50633_REGULATOR_LDO5] = PCF50633_REG_LDO5OUT,
	46	[PCF50633_REGULATOR_LDO6] = PCF50633_REG_LDO6OUT,
	47	[PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT,
	48	};
	49
	50	/* Bits from voltage value */
	51	static u8 auto_voltage_bits(unsigned int millivolts)
	52	{
	53	if (millivolts < 1800)
	54	return 0;
	55	if (millivolts > 3800)
	56	return 0xff;
	57
	58	millivolts -= 625;
	59
	60	return millivolts / 25;
	61	}
	62
	63	static u8 down_voltage_bits(unsigned int millivolts)
	64	{
65	if (millivolts < 625)
66	return 0;
67	else if (millivolts > 3000)
68	return 0xff;
69
70	millivolts -= 625;
71
72	return millivolts / 25;
73	}
74
75	static u8 ldo_voltage_bits(unsigned int millivolts)
76	{
77	if (millivolts < 900)
78	return 0;
79	else if (millivolts > 3600)
80	return 0x1f;
81
82	millivolts -= 900;
83	return millivolts / 100;
84	}
85
86	/* Obtain voltage value from bits */
87	static unsigned int auto_voltage_value(u8 bits)
88	{
89	if (bits < 0x2f)
90	return 0;
91
92	return 625 + (bits * 25);
93	}
94
95
96	static unsigned int down_voltage_value(u8 bits)
97	{
98	return 625 + (bits * 25);
99	}
100
101
102	static unsigned int ldo_voltage_value(u8 bits)
103	{
104	bits &= 0x1f;
105
106	return 900 + (bits * 100);
107	}
108
109	static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
110	int min_uV, int max_uV)
111	{
112	struct pcf50633 *pcf;
113	int regulator_id, millivolts;
114	u8 volt_bits, regnr;
115
116	pcf = rdev_get_drvdata(rdev);
117
118	regulator_id = rdev_get_id(rdev);
119	if (regulator_id >= PCF50633_NUM_REGULATORS)
120	return -EINVAL;
121
122	millivolts = min_uV / 1000;
123
124	regnr = pcf50633_regulator_registers[regulator_id];
125
126	switch (regulator_id) {
127	case PCF50633_REGULATOR_AUTO:
128	volt_bits = auto_voltage_bits(millivolts);
129	break;
130	case PCF50633_REGULATOR_DOWN1:
131	volt_bits = down_voltage_bits(millivolts);
132	break;
133	case PCF50633_REGULATOR_DOWN2:
134	volt_bits = down_voltage_bits(millivolts);
135	break;
136	case PCF50633_REGULATOR_LDO1:
137	case PCF50633_REGULATOR_LDO2:
138	case PCF50633_REGULATOR_LDO3:
139	case PCF50633_REGULATOR_LDO4:
140	case PCF50633_REGULATOR_LDO5:
141	case PCF50633_REGULATOR_LDO6:
142	case PCF50633_REGULATOR_HCLDO:
143	volt_bits = ldo_voltage_bits(millivolts);
144	break;
145	default:
146	return -EINVAL;
147	}
148
149	return pcf50633_reg_write(pcf, regnr, volt_bits);
150	}
151
152	static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
153	{
154	struct pcf50633 *pcf;
155	int regulator_id, millivolts, volt_bits;
156	u8 regnr;
157
158	pcf = rdev_get_drvdata(rdev);;
159
160	regulator_id = rdev_get_id(rdev);
161	if (regulator_id >= PCF50633_NUM_REGULATORS)
162	return -EINVAL;
163
164	regnr = pcf50633_regulator_registers[regulator_id];
165
166	volt_bits = pcf50633_reg_read(pcf, regnr);
167	if (volt_bits < 0)
168	return -1;
169
170	switch (regulator_id) {
171	case PCF50633_REGULATOR_AUTO:
172	millivolts = auto_voltage_value(volt_bits);
173	break;
174	case PCF50633_REGULATOR_DOWN1:
175	millivolts = down_voltage_value(volt_bits);
176	break;
177	case PCF50633_REGULATOR_DOWN2:
178	millivolts = down_voltage_value(volt_bits);
179	break;
180	case PCF50633_REGULATOR_LDO1:
181	case PCF50633_REGULATOR_LDO2:
182	case PCF50633_REGULATOR_LDO3:
183	case PCF50633_REGULATOR_LDO4:
184	case PCF50633_REGULATOR_LDO5:
185	case PCF50633_REGULATOR_LDO6:
186	case PCF50633_REGULATOR_HCLDO:
187	millivolts = ldo_voltage_value(volt_bits);
188	break;
189	default:
190	return -EINVAL;
191	}
192
193	return millivolts * 1000;
194	}
195
196	static int pcf50633_regulator_enable(struct regulator_dev *rdev)
197	{
198	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
199	int regulator_id;
200	u8 regnr;
201
202	regulator_id = rdev_get_id(rdev);
203	if (regulator_id >= PCF50633_NUM_REGULATORS)
204	return -EINVAL;
205
206	/* The ENA register is always one after the OUT register */
207	regnr = pcf50633_regulator_registers[regulator_id] + 1;
208
209	return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
210	PCF50633_REGULATOR_ON);
211	}
212
213	static int pcf50633_regulator_disable(struct regulator_dev *rdev)
214	{
215	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
216	int regulator_id;
217	u8 regnr;
218
219	regulator_id = rdev_get_id(rdev);
220	if (regulator_id >= PCF50633_NUM_REGULATORS)
221	return -EINVAL;
222
223	/* the ENA register is always one after the OUT register */
224	regnr = pcf50633_regulator_registers[regulator_id] + 1;
225
226	return pcf50633_reg_set_bit_mask(pcf, regnr,
227	PCF50633_REGULATOR_ON, 0);
228	}
229
230	static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
231	{
232	struct pcf50633 *pcf = rdev_get_drvdata(rdev);
233	int regulator_id = rdev_get_id(rdev);
234	u8 regnr;
235
236	regulator_id = rdev_get_id(rdev);
237	if (regulator_id >= PCF50633_NUM_REGULATORS)
238	return -EINVAL;
239
240	/* the ENA register is always one after the OUT register */
241	regnr = pcf50633_regulator_registers[regulator_id] + 1;
242
243	return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
244	}
245
246	static struct regulator_ops pcf50633_regulator_ops = {
247	.set_voltage = pcf50633_regulator_set_voltage,
248	.get_voltage = pcf50633_regulator_get_voltage,
249	.enable = pcf50633_regulator_enable,
250	.disable = pcf50633_regulator_disable,
251	.is_enabled = pcf50633_regulator_is_enabled,
252	};
253
254	static struct regulator_desc regulators[] = {
255	[PCF50633_REGULATOR_AUTO] =
256	PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
257	[PCF50633_REGULATOR_DOWN1] =
258	PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
259	[PCF50633_REGULATOR_DOWN2] =
260	PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
261	[PCF50633_REGULATOR_LDO1] =
262	PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
263	[PCF50633_REGULATOR_LDO2] =
264	PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
265	[PCF50633_REGULATOR_LDO3] =
266	PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
267	[PCF50633_REGULATOR_LDO4] =
268	PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
269	[PCF50633_REGULATOR_LDO5] =
270	PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
271	[PCF50633_REGULATOR_LDO6] =
272	PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
273	[PCF50633_REGULATOR_HCLDO] =
274	PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
275	[PCF50633_REGULATOR_MEMLDO] =
276	PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
277	};
278
279	static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
280	{
281	struct regulator_dev *rdev;
282	struct pcf50633 *pcf;
283
284	/* Already set by core driver */
285	pcf = platform_get_drvdata(pdev);
286
287	rdev = regulator_register(&regulators[pdev->id], &pdev->dev, pcf);
288	if (IS_ERR(rdev))
289	return PTR_ERR(rdev);
290
291	if (pcf->pdata->regulator_registered)
292	pcf->pdata->regulator_registered(pcf, pdev->id);
293
294	return 0;
295	}
296
297	static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
298	{
299	struct regulator_dev *rdev = platform_get_drvdata(pdev);
300
301	regulator_unregister(rdev);
302
303	return 0;
304	}
305
306	static struct platform_driver pcf50633_regulator_driver = {
307	.driver = {
308	.name = "pcf50633-regltr",
309	},
310	.probe = pcf50633_regulator_probe,
311	.remove = __devexit_p(pcf50633_regulator_remove),
312	};
313
314	static int __init pcf50633_regulator_init(void)
315	{
316	return platform_driver_register(&pcf50633_regulator_driver);
317	}
318	module_init(pcf50633_regulator_init);
319
320	static void __exit pcf50633_regulator_exit(void)
321	{
322	platform_driver_unregister(&pcf50633_regulator_driver);
323	}
324	module_exit(pcf50633_regulator_exit);
325
326	MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
327	MODULE_DESCRIPTION("PCF50633 regulator driver");
328	MODULE_LICENSE("GPL");
329	MODULE_ALIAS("platform:pcf50633-regulator");