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>
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. */
46 gpio_set_value(ldo->enable, 1);
47 ldo->is_enabled = true;
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. */
60 gpio_set_value(ldo->enable, 0);
61 ldo->is_enabled = false;
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. */
80 static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
81 unsigned int selector)
83 if (selector > WM8994_LDO1_MAX_SELECTOR)
86 return (selector * 100000) + 2400000;
89 static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
91 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
94 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
98 val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
100 return wm8994_ldo1_list_voltage(rdev, val);
103 static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
104 int min_uV, int max_uV)
106 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
109 selector = (min_uV - 2400000) / 100000;
110 v = wm8994_ldo1_list_voltage(rdev, selector);
111 if (v < 0 || v > max_uV)
114 selector <<= WM8994_LDO1_VSEL_SHIFT;
116 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
117 WM8994_LDO1_VSEL_MASK, selector);
120 static struct regulator_ops wm8994_ldo1_ops = {
121 .enable = wm8994_ldo_enable,
122 .disable = wm8994_ldo_disable,
123 .is_enabled = wm8994_ldo_is_enabled,
124 .enable_time = wm8994_ldo_enable_time,
126 .list_voltage = wm8994_ldo1_list_voltage,
127 .get_voltage = wm8994_ldo1_get_voltage,
128 .set_voltage = wm8994_ldo1_set_voltage,
131 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
132 unsigned int selector)
134 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
136 if (selector > WM8994_LDO2_MAX_SELECTOR)
139 switch (ldo->wm8994->type) {
141 return (selector * 100000) + 900000;
143 return (selector * 100000) + 1000000;
149 static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
151 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
154 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
158 val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
160 return wm8994_ldo2_list_voltage(rdev, val);
163 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
164 int min_uV, int max_uV)
166 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
169 switch (ldo->wm8994->type) {
171 selector = (min_uV - 900000) / 100000;
174 selector = (min_uV - 1000000) / 100000;
180 v = wm8994_ldo2_list_voltage(rdev, selector);
181 if (v < 0 || v > max_uV)
184 selector <<= WM8994_LDO2_VSEL_SHIFT;
186 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
187 WM8994_LDO2_VSEL_MASK, selector);
190 static struct regulator_ops wm8994_ldo2_ops = {
191 .enable = wm8994_ldo_enable,
192 .disable = wm8994_ldo_disable,
193 .is_enabled = wm8994_ldo_is_enabled,
194 .enable_time = wm8994_ldo_enable_time,
196 .list_voltage = wm8994_ldo2_list_voltage,
197 .get_voltage = wm8994_ldo2_get_voltage,
198 .set_voltage = wm8994_ldo2_set_voltage,
201 static struct regulator_desc wm8994_ldo_desc[] = {
205 .type = REGULATOR_VOLTAGE,
206 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
207 .ops = &wm8994_ldo1_ops,
208 .owner = THIS_MODULE,
213 .type = REGULATOR_VOLTAGE,
214 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
215 .ops = &wm8994_ldo2_ops,
216 .owner = THIS_MODULE,
220 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
222 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
223 struct wm8994_pdata *pdata = wm8994->dev->platform_data;
224 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
225 struct wm8994_ldo *ldo;
228 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
233 ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
235 dev_err(&pdev->dev, "Unable to allocate private data\n");
239 ldo->wm8994 = wm8994;
241 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
242 ldo->enable = pdata->ldo[id].enable;
244 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
246 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
251 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
253 dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
258 ldo->is_enabled = true;
260 ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
261 pdata->ldo[id].init_data, ldo);
262 if (IS_ERR(ldo->regulator)) {
263 ret = PTR_ERR(ldo->regulator);
264 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
269 platform_set_drvdata(pdev, ldo);
274 if (gpio_is_valid(ldo->enable))
275 gpio_free(ldo->enable);
281 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
283 struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
285 platform_set_drvdata(pdev, NULL);
287 regulator_unregister(ldo->regulator);
288 if (gpio_is_valid(ldo->enable))
289 gpio_free(ldo->enable);
295 static struct platform_driver wm8994_ldo_driver = {
296 .probe = wm8994_ldo_probe,
297 .remove = __devexit_p(wm8994_ldo_remove),
299 .name = "wm8994-ldo",
300 .owner = THIS_MODULE,
304 static int __init wm8994_ldo_init(void)
308 ret = platform_driver_register(&wm8994_ldo_driver);
310 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
314 subsys_initcall(wm8994_ldo_init);
316 static void __exit wm8994_ldo_exit(void)
318 platform_driver_unregister(&wm8994_ldo_driver);
320 module_exit(wm8994_ldo_exit);
322 /* Module information */
323 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
324 MODULE_DESCRIPTION("WM8994 LDO driver");
325 MODULE_LICENSE("GPL");
326 MODULE_ALIAS("platform:wm8994-ldo");