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_sel(struct regulator_dev *rdev)
91 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
94 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
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);
107 selector = (min_uV - 2400000) / 100000;
108 v = wm8994_ldo1_list_voltage(rdev, selector);
109 if (v < 0 || v > max_uV)
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 if (selector > WM8994_LDO2_MAX_SELECTOR)
136 return (selector * 100000) + 900000;
139 static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
141 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
144 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
148 return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
151 static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
152 int min_uV, int max_uV, unsigned *s)
154 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
157 selector = (min_uV - 900000) / 100000;
158 v = wm8994_ldo2_list_voltage(rdev, selector);
159 if (v < 0 || v > max_uV)
163 selector <<= WM8994_LDO2_VSEL_SHIFT;
165 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
166 WM8994_LDO2_VSEL_MASK, selector);
169 static 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,
175 .list_voltage = wm8994_ldo2_list_voltage,
176 .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
177 .set_voltage = wm8994_ldo2_set_voltage,
180 static struct regulator_desc wm8994_ldo_desc[] = {
184 .type = REGULATOR_VOLTAGE,
185 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
186 .ops = &wm8994_ldo1_ops,
187 .owner = THIS_MODULE,
192 .type = REGULATOR_VOLTAGE,
193 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
194 .ops = &wm8994_ldo2_ops,
195 .owner = THIS_MODULE,
199 static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
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;
207 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
212 ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
214 dev_err(&pdev->dev, "Unable to allocate private data\n");
218 ldo->wm8994 = wm8994;
220 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
221 ldo->enable = pdata->ldo[id].enable;
223 ret = gpio_request(ldo->enable, "WM8994 LDO enable");
225 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
230 ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
232 dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
237 ldo->is_enabled = true;
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",
248 platform_set_drvdata(pdev, ldo);
253 if (gpio_is_valid(ldo->enable))
254 gpio_free(ldo->enable);
260 static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
262 struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
264 platform_set_drvdata(pdev, NULL);
266 regulator_unregister(ldo->regulator);
267 if (gpio_is_valid(ldo->enable))
268 gpio_free(ldo->enable);
274 static struct platform_driver wm8994_ldo_driver = {
275 .probe = wm8994_ldo_probe,
276 .remove = __devexit_p(wm8994_ldo_remove),
278 .name = "wm8994-ldo",
279 .owner = THIS_MODULE,
283 static int __init wm8994_ldo_init(void)
287 ret = platform_driver_register(&wm8994_ldo_driver);
289 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
293 subsys_initcall(wm8994_ldo_init);
295 static void __exit wm8994_ldo_exit(void)
297 platform_driver_unregister(&wm8994_ldo_driver);
299 module_exit(wm8994_ldo_exit);
301 /* Module information */
302 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
303 MODULE_DESCRIPTION("WM8994 LDO driver");
304 MODULE_LICENSE("GPL");
305 MODULE_ALIAS("platform:wm8994-ldo");