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Mark Brown69dc16c2010-01-25 19:41:57 +00001/*
2 * wm8994-regulator.c -- Regulator driver for the WM8994
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/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Mark Brown69dc16c2010-01-25 19:41:57 +000023
24#include <linux/mfd/wm8994/core.h>
25#include <linux/mfd/wm8994/registers.h>
26#include <linux/mfd/wm8994/pdata.h>
27
28struct wm8994_ldo {
29 int enable;
Dmitry Torokhov598b3572010-02-23 23:38:44 -080030 bool is_enabled;
Mark Brown69dc16c2010-01-25 19:41:57 +000031 struct regulator_dev *regulator;
32 struct wm8994 *wm8994;
33};
34
35#define WM8994_LDO1_MAX_SELECTOR 0x7
36#define WM8994_LDO2_MAX_SELECTOR 0x3
37
38static int wm8994_ldo_enable(struct regulator_dev *rdev)
39{
40 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
41
42 /* If we have no soft control assume that the LDO is always enabled. */
43 if (!ldo->enable)
44 return 0;
45
46 gpio_set_value(ldo->enable, 1);
Dmitry Torokhov598b3572010-02-23 23:38:44 -080047 ldo->is_enabled = true;
Mark Brown69dc16c2010-01-25 19:41:57 +000048
49 return 0;
50}
51
52static int wm8994_ldo_disable(struct regulator_dev *rdev)
53{
54 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
55
56 /* If we have no soft control assume that the LDO is always enabled. */
57 if (!ldo->enable)
58 return -EINVAL;
59
60 gpio_set_value(ldo->enable, 0);
Dmitry Torokhov598b3572010-02-23 23:38:44 -080061 ldo->is_enabled = false;
Mark Brown69dc16c2010-01-25 19:41:57 +000062
63 return 0;
64}
65
66static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
67{
68 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
69
70 return ldo->is_enabled;
71}
72
73static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
74{
75 /* 3ms is fairly conservative but this shouldn't be too performance
76 * critical; can be tweaked per-system if required. */
77 return 3000;
78}
79
80static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
81 unsigned int selector)
82{
83 if (selector > WM8994_LDO1_MAX_SELECTOR)
84 return -EINVAL;
85
86 return (selector * 100000) + 2400000;
87}
88
Mark Brownd9f0f282010-12-12 14:07:06 +000089static int wm8994_ldo1_get_voltage_sel(struct regulator_dev *rdev)
Mark Brown69dc16c2010-01-25 19:41:57 +000090{
91 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
92 int val;
93
94 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
95 if (val < 0)
96 return val;
97
Mark Brownd9f0f282010-12-12 14:07:06 +000098 return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
Mark Brown69dc16c2010-01-25 19:41:57 +000099}
100
101static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
Mark Brown3a93f2a2010-11-10 14:38:29 +0000102 int min_uV, int max_uV, unsigned *s)
Mark Brown69dc16c2010-01-25 19:41:57 +0000103{
104 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
105 int selector, v;
106
107 selector = (min_uV - 2400000) / 100000;
108 v = wm8994_ldo1_list_voltage(rdev, selector);
109 if (v < 0 || v > max_uV)
110 return -EINVAL;
111
Mark Brown3a93f2a2010-11-10 14:38:29 +0000112 *s = selector;
Mark Brown69dc16c2010-01-25 19:41:57 +0000113 selector <<= WM8994_LDO1_VSEL_SHIFT;
114
115 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
116 WM8994_LDO1_VSEL_MASK, selector);
117}
118
119static struct regulator_ops wm8994_ldo1_ops = {
120 .enable = wm8994_ldo_enable,
121 .disable = wm8994_ldo_disable,
122 .is_enabled = wm8994_ldo_is_enabled,
123 .enable_time = wm8994_ldo_enable_time,
124
125 .list_voltage = wm8994_ldo1_list_voltage,
Mark Brownd9f0f282010-12-12 14:07:06 +0000126 .get_voltage_sel = wm8994_ldo1_get_voltage_sel,
Mark Brown69dc16c2010-01-25 19:41:57 +0000127 .set_voltage = wm8994_ldo1_set_voltage,
128};
129
130static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
131 unsigned int selector)
132{
133 if (selector > WM8994_LDO2_MAX_SELECTOR)
134 return -EINVAL;
135
136 return (selector * 100000) + 900000;
137}
138
Mark Brownd9f0f282010-12-12 14:07:06 +0000139static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
Mark Brown69dc16c2010-01-25 19:41:57 +0000140{
141 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
142 int val;
143
144 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
145 if (val < 0)
146 return val;
147
Mark Brownd9f0f282010-12-12 14:07:06 +0000148 return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
Mark Brown69dc16c2010-01-25 19:41:57 +0000149}
150
151static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
Mark Brown3a93f2a2010-11-10 14:38:29 +0000152 int min_uV, int max_uV, unsigned *s)
Mark Brown69dc16c2010-01-25 19:41:57 +0000153{
154 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
155 int selector, v;
156
157 selector = (min_uV - 900000) / 100000;
158 v = wm8994_ldo2_list_voltage(rdev, selector);
159 if (v < 0 || v > max_uV)
160 return -EINVAL;
161
Mark Brown3a93f2a2010-11-10 14:38:29 +0000162 *s = selector;
Mark Brown69dc16c2010-01-25 19:41:57 +0000163 selector <<= WM8994_LDO2_VSEL_SHIFT;
164
165 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
166 WM8994_LDO2_VSEL_MASK, selector);
167}
168
169static struct regulator_ops wm8994_ldo2_ops = {
170 .enable = wm8994_ldo_enable,
171 .disable = wm8994_ldo_disable,
172 .is_enabled = wm8994_ldo_is_enabled,
173 .enable_time = wm8994_ldo_enable_time,
174
175 .list_voltage = wm8994_ldo2_list_voltage,
Mark Brownd9f0f282010-12-12 14:07:06 +0000176 .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
Mark Brown69dc16c2010-01-25 19:41:57 +0000177 .set_voltage = wm8994_ldo2_set_voltage,
178};
179
180static struct regulator_desc wm8994_ldo_desc[] = {
181 {
182 .name = "LDO1",
183 .id = 1,
184 .type = REGULATOR_VOLTAGE,
185 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
186 .ops = &wm8994_ldo1_ops,
187 .owner = THIS_MODULE,
188 },
189 {
190 .name = "LDO2",
191 .id = 2,
192 .type = REGULATOR_VOLTAGE,
193 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
194 .ops = &wm8994_ldo2_ops,
195 .owner = THIS_MODULE,
196 },
197};
198
199static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
200{
201 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
202 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
203 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
204 struct wm8994_ldo *ldo;
205 int ret;
206
207 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
208
209 if (!pdata)
210 return -ENODEV;
211
212 ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
213 if (ldo == NULL) {
214 dev_err(&pdev->dev, "Unable to allocate private data\n");
215 return -ENOMEM;
216 }
217
218 ldo->wm8994 = wm8994;
219
Mark Brown69dc16c2010-01-25 19:41:57 +0000220 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
221 ldo->enable = pdata->ldo[id].enable;
222
223 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
224 if (ret < 0) {
225 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
226 ret);
227 goto err;
228 }
229
230 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
231 if (ret < 0) {
232 dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
233 ret);
234 goto err_gpio;
235 }
Joonyoung Shimc4604e42010-08-06 15:48:24 +0100236 } else
237 ldo->is_enabled = true;
Mark Brown69dc16c2010-01-25 19:41:57 +0000238
239 ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
240 pdata->ldo[id].init_data, ldo);
241 if (IS_ERR(ldo->regulator)) {
242 ret = PTR_ERR(ldo->regulator);
243 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
244 id + 1, ret);
245 goto err_gpio;
246 }
247
248 platform_set_drvdata(pdev, ldo);
249
250 return 0;
251
252err_gpio:
253 if (gpio_is_valid(ldo->enable))
254 gpio_free(ldo->enable);
255err:
256 kfree(ldo);
257 return ret;
258}
259
260static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
261{
262 struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
263
Dmitry Torokhov598b3572010-02-23 23:38:44 -0800264 platform_set_drvdata(pdev, NULL);
265
Mark Brown69dc16c2010-01-25 19:41:57 +0000266 regulator_unregister(ldo->regulator);
267 if (gpio_is_valid(ldo->enable))
268 gpio_free(ldo->enable);
269 kfree(ldo);
270
271 return 0;
272}
273
274static struct platform_driver wm8994_ldo_driver = {
275 .probe = wm8994_ldo_probe,
276 .remove = __devexit_p(wm8994_ldo_remove),
277 .driver = {
278 .name = "wm8994-ldo",
Dmitry Torokhov598b3572010-02-23 23:38:44 -0800279 .owner = THIS_MODULE,
Mark Brown69dc16c2010-01-25 19:41:57 +0000280 },
281};
282
283static int __init wm8994_ldo_init(void)
284{
285 int ret;
286
287 ret = platform_driver_register(&wm8994_ldo_driver);
288 if (ret != 0)
289 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
290
291 return ret;
292}
293subsys_initcall(wm8994_ldo_init);
294
295static void __exit wm8994_ldo_exit(void)
296{
297 platform_driver_unregister(&wm8994_ldo_driver);
298}
299module_exit(wm8994_ldo_exit);
300
301/* Module information */
302MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
303MODULE_DESCRIPTION("WM8994 LDO driver");
304MODULE_LICENSE("GPL");
305MODULE_ALIAS("platform:wm8994-ldo");