Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / regulator / wm8994-regulator.c
blob35b2958d51064a84950deef280a14603b1e4e0da
1 /*
2 * wm8994-regulator.c -- Regulator driver for the WM8994
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
22 #include <linux/slab.h>
24 #include <linux/mfd/wm8994/core.h>
25 #include <linux/mfd/wm8994/registers.h>
26 #include <linux/mfd/wm8994/pdata.h>
28 struct wm8994_ldo {
29 int enable;
30 bool is_enabled;
31 struct regulator_dev *regulator;
32 struct wm8994 *wm8994;
35 #define WM8994_LDO1_MAX_SELECTOR 0x7
36 #define WM8994_LDO2_MAX_SELECTOR 0x3
38 static int wm8994_ldo_enable(struct regulator_dev *rdev)
40 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
42 /* If we have no soft control assume that the LDO is always enabled. */
43 if (!ldo->enable)
44 return 0;
46 gpio_set_value(ldo->enable, 1);
47 ldo->is_enabled = true;
49 return 0;
52 static int wm8994_ldo_disable(struct regulator_dev *rdev)
54 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
56 /* If we have no soft control assume that the LDO is always enabled. */
57 if (!ldo->enable)
58 return -EINVAL;
60 gpio_set_value(ldo->enable, 0);
61 ldo->is_enabled = false;
63 return 0;
66 static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
68 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
70 return ldo->is_enabled;
73 static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
75 /* 3ms is fairly conservative but this shouldn't be too performance
76 * critical; can be tweaked per-system if required. */
77 return 3000;
80 static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
81 unsigned int selector)
83 if (selector > WM8994_LDO1_MAX_SELECTOR)
84 return -EINVAL;
86 return (selector * 100000) + 2400000;
89 static int wm8994_ldo1_get_voltage_sel(struct regulator_dev *rdev)
91 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
92 int val;
94 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
95 if (val < 0)
96 return val;
98 return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
101 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
102 int min_uV, int max_uV, unsigned *s)
104 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
105 int selector, v;
107 selector = (min_uV - 2400000) / 100000;
108 v = wm8994_ldo1_list_voltage(rdev, selector);
109 if (v < 0 || v > max_uV)
110 return -EINVAL;
112 *s = selector;
113 selector <<= WM8994_LDO1_VSEL_SHIFT;
115 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
116 WM8994_LDO1_VSEL_MASK, selector);
119 static 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,
125 .list_voltage = wm8994_ldo1_list_voltage,
126 .get_voltage_sel = wm8994_ldo1_get_voltage_sel,
127 .set_voltage = wm8994_ldo1_set_voltage,
130 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
131 unsigned int selector)
133 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
135 if (selector > WM8994_LDO2_MAX_SELECTOR)
136 return -EINVAL;
138 switch (ldo->wm8994->type) {
139 case WM8994:
140 return (selector * 100000) + 900000;
141 case WM8958:
142 return (selector * 100000) + 1000000;
143 default:
144 return -EINVAL;
148 static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
150 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
151 int val;
153 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
154 if (val < 0)
155 return val;
157 return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
160 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
161 int min_uV, int max_uV, unsigned *s)
163 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
164 int selector, v;
166 switch (ldo->wm8994->type) {
167 case WM8994:
168 selector = (min_uV - 900000) / 100000;
169 break;
170 case WM8958:
171 selector = (min_uV - 1000000) / 100000;
172 break;
173 default:
174 return -EINVAL;
177 v = wm8994_ldo2_list_voltage(rdev, selector);
178 if (v < 0 || v > max_uV)
179 return -EINVAL;
181 *s = selector;
182 selector <<= WM8994_LDO2_VSEL_SHIFT;
184 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
185 WM8994_LDO2_VSEL_MASK, selector);
188 static struct regulator_ops wm8994_ldo2_ops = {
189 .enable = wm8994_ldo_enable,
190 .disable = wm8994_ldo_disable,
191 .is_enabled = wm8994_ldo_is_enabled,
192 .enable_time = wm8994_ldo_enable_time,
194 .list_voltage = wm8994_ldo2_list_voltage,
195 .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
196 .set_voltage = wm8994_ldo2_set_voltage,
199 static struct regulator_desc wm8994_ldo_desc[] = {
201 .name = "LDO1",
202 .id = 1,
203 .type = REGULATOR_VOLTAGE,
204 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
205 .ops = &wm8994_ldo1_ops,
206 .owner = THIS_MODULE,
209 .name = "LDO2",
210 .id = 2,
211 .type = REGULATOR_VOLTAGE,
212 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
213 .ops = &wm8994_ldo2_ops,
214 .owner = THIS_MODULE,
218 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
220 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
221 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
222 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
223 struct wm8994_ldo *ldo;
224 int ret;
226 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
228 if (!pdata)
229 return -ENODEV;
231 ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
232 if (ldo == NULL) {
233 dev_err(&pdev->dev, "Unable to allocate private data\n");
234 return -ENOMEM;
237 ldo->wm8994 = wm8994;
239 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
240 ldo->enable = pdata->ldo[id].enable;
242 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
243 if (ret < 0) {
244 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
245 ret);
246 goto err;
249 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
250 if (ret < 0) {
251 dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
252 ret);
253 goto err_gpio;
255 } else
256 ldo->is_enabled = true;
258 ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
259 pdata->ldo[id].init_data, ldo);
260 if (IS_ERR(ldo->regulator)) {
261 ret = PTR_ERR(ldo->regulator);
262 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
263 id + 1, ret);
264 goto err_gpio;
267 platform_set_drvdata(pdev, ldo);
269 return 0;
271 err_gpio:
272 if (gpio_is_valid(ldo->enable))
273 gpio_free(ldo->enable);
274 err:
275 kfree(ldo);
276 return ret;
279 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
281 struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
283 platform_set_drvdata(pdev, NULL);
285 regulator_unregister(ldo->regulator);
286 if (gpio_is_valid(ldo->enable))
287 gpio_free(ldo->enable);
288 kfree(ldo);
290 return 0;
293 static struct platform_driver wm8994_ldo_driver = {
294 .probe = wm8994_ldo_probe,
295 .remove = __devexit_p(wm8994_ldo_remove),
296 .driver = {
297 .name = "wm8994-ldo",
298 .owner = THIS_MODULE,
302 static int __init wm8994_ldo_init(void)
304 int ret;
306 ret = platform_driver_register(&wm8994_ldo_driver);
307 if (ret != 0)
308 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
310 return ret;
312 subsys_initcall(wm8994_ldo_init);
314 static void __exit wm8994_ldo_exit(void)
316 platform_driver_unregister(&wm8994_ldo_driver);
318 module_exit(wm8994_ldo_exit);
320 /* Module information */
321 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
322 MODULE_DESCRIPTION("WM8994 LDO driver");
323 MODULE_LICENSE("GPL");
324 MODULE_ALIAS("platform:wm8994-ldo");