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1/*
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>
22#include <linux/slab.h>
23
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;
30 bool is_enabled;
31 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_cansleep(ldo->enable, 1);
47 ldo->is_enabled = true;
48
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_cansleep(ldo->enable, 0);
61 ldo->is_enabled = false;
62
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
89static int wm8994_ldo1_get_voltage_sel(struct regulator_dev *rdev)
90{
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
98 return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
99}
100
101static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
102 int min_uV, int max_uV, unsigned *s)
103{
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
112 *s = selector;
113 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,
126 .get_voltage_sel = wm8994_ldo1_get_voltage_sel,
127 .set_voltage = wm8994_ldo1_set_voltage,
128};
129
130static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
131 unsigned int selector)
132{
133 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
134
135 if (selector > WM8994_LDO2_MAX_SELECTOR)
136 return -EINVAL;
137
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;
145 }
146}
147
148static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
149{
150 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
151 int val;
152
153 val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
154 if (val < 0)
155 return val;
156
157 return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
158}
159
160static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
161 int min_uV, int max_uV, unsigned *s)
162{
163 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
164 int selector, v;
165
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;
175 }
176
177 v = wm8994_ldo2_list_voltage(rdev, selector);
178 if (v < 0 || v > max_uV)
179 return -EINVAL;
180
181 *s = selector;
182 selector <<= WM8994_LDO2_VSEL_SHIFT;
183
184 return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
185 WM8994_LDO2_VSEL_MASK, selector);
186}
187
188static 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,
193
194 .list_voltage = wm8994_ldo2_list_voltage,
195 .get_voltage_sel = wm8994_ldo2_get_voltage_sel,
196 .set_voltage = wm8994_ldo2_set_voltage,
197};
198
199static struct regulator_desc wm8994_ldo_desc[] = {
200 {
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,
207 },
208 {
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,
215 },
216};
217
218static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
219{
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;
225
226 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
227
228 if (!pdata)
229 return -ENODEV;
230
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;
235 }
236
237 ldo->wm8994 = wm8994;
238
239 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
240 ldo->enable = pdata->ldo[id].enable;
241
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;
247 }
248
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;
254 }
255 } else
256 ldo->is_enabled = true;
257
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;
265 }
266
267 platform_set_drvdata(pdev, ldo);
268
269 return 0;
270
271err_gpio:
272 if (gpio_is_valid(ldo->enable))
273 gpio_free(ldo->enable);
274err:
275 kfree(ldo);
276 return ret;
277}
278
279static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
280{
281 struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
282
283 platform_set_drvdata(pdev, NULL);
284
285 regulator_unregister(ldo->regulator);
286 if (gpio_is_valid(ldo->enable))
287 gpio_free(ldo->enable);
288 kfree(ldo);
289
290 return 0;
291}
292
293static 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,
299 },
300};
301
302static int __init wm8994_ldo_init(void)
303{
304 int ret;
305
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);
309
310 return ret;
311}
312subsys_initcall(wm8994_ldo_init);
313
314static void __exit wm8994_ldo_exit(void)
315{
316 platform_driver_unregister(&wm8994_ldo_driver);
317}
318module_exit(wm8994_ldo_exit);
319
320/* Module information */
321MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
322MODULE_DESCRIPTION("WM8994 LDO driver");
323MODULE_LICENSE("GPL");
324MODULE_ALIAS("platform:wm8994-ldo");
1/*
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/regulator/machine.h>
22#include <linux/gpio.h>
23#include <linux/slab.h>
24
25#include <linux/mfd/wm8994/core.h>
26#include <linux/mfd/wm8994/registers.h>
27#include <linux/mfd/wm8994/pdata.h>
28
29struct wm8994_ldo {
30 struct regulator_dev *regulator;
31 struct wm8994 *wm8994;
32 struct regulator_consumer_supply supply;
33 struct regulator_init_data init_data;
34};
35
36#define WM8994_LDO1_MAX_SELECTOR 0x7
37#define WM8994_LDO2_MAX_SELECTOR 0x3
38
39static struct regulator_ops wm8994_ldo1_ops = {
40 .list_voltage = regulator_list_voltage_linear,
41 .map_voltage = regulator_map_voltage_linear,
42 .get_voltage_sel = regulator_get_voltage_sel_regmap,
43 .set_voltage_sel = regulator_set_voltage_sel_regmap,
44};
45
46static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
47 unsigned int selector)
48{
49 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
50
51 if (selector > WM8994_LDO2_MAX_SELECTOR)
52 return -EINVAL;
53
54 switch (ldo->wm8994->type) {
55 case WM8994:
56 return (selector * 100000) + 900000;
57 case WM8958:
58 return (selector * 100000) + 1000000;
59 case WM1811:
60 switch (selector) {
61 case 0:
62 return -EINVAL;
63 default:
64 return (selector * 100000) + 950000;
65 }
66 break;
67 default:
68 return -EINVAL;
69 }
70}
71
72static struct regulator_ops wm8994_ldo2_ops = {
73 .list_voltage = wm8994_ldo2_list_voltage,
74 .get_voltage_sel = regulator_get_voltage_sel_regmap,
75 .set_voltage_sel = regulator_set_voltage_sel_regmap,
76};
77
78static const struct regulator_desc wm8994_ldo_desc[] = {
79 {
80 .name = "LDO1",
81 .id = 1,
82 .type = REGULATOR_VOLTAGE,
83 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
84 .vsel_reg = WM8994_LDO_1,
85 .vsel_mask = WM8994_LDO1_VSEL_MASK,
86 .ops = &wm8994_ldo1_ops,
87 .min_uV = 2400000,
88 .uV_step = 100000,
89 .enable_time = 3000,
90 .owner = THIS_MODULE,
91 },
92 {
93 .name = "LDO2",
94 .id = 2,
95 .type = REGULATOR_VOLTAGE,
96 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
97 .vsel_reg = WM8994_LDO_2,
98 .vsel_mask = WM8994_LDO2_VSEL_MASK,
99 .ops = &wm8994_ldo2_ops,
100 .enable_time = 3000,
101 .owner = THIS_MODULE,
102 },
103};
104
105static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
106 { .supply = "AVDD1" },
107 { .supply = "DCVDD" },
108};
109
110static const struct regulator_init_data wm8994_ldo_default[] = {
111 {
112 .constraints = {
113 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
114 },
115 .num_consumer_supplies = 1,
116 },
117 {
118 .constraints = {
119 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
120 },
121 .num_consumer_supplies = 1,
122 },
123};
124
125static int wm8994_ldo_probe(struct platform_device *pdev)
126{
127 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
128 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
129 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
130 struct regulator_config config = { };
131 struct wm8994_ldo *ldo;
132 int ret;
133
134 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
135
136 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
137 if (!ldo)
138 return -ENOMEM;
139
140 ldo->wm8994 = wm8994;
141 ldo->supply = wm8994_ldo_consumer[id];
142 ldo->supply.dev_name = dev_name(wm8994->dev);
143
144 config.dev = wm8994->dev;
145 config.driver_data = ldo;
146 config.regmap = wm8994->regmap;
147 config.init_data = &ldo->init_data;
148 if (pdata)
149 config.ena_gpio = pdata->ldo[id].enable;
150 else if (wm8994->dev->of_node)
151 config.ena_gpio = wm8994->pdata.ldo[id].enable;
152
153 /* Use default constraints if none set up */
154 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
155 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
156 ldo->supply.dev_name, ldo->supply.supply);
157
158 ldo->init_data = wm8994_ldo_default[id];
159 ldo->init_data.consumer_supplies = &ldo->supply;
160 if (!config.ena_gpio)
161 ldo->init_data.constraints.valid_ops_mask = 0;
162 } else {
163 ldo->init_data = *pdata->ldo[id].init_data;
164 }
165
166 ldo->regulator = devm_regulator_register(&pdev->dev,
167 &wm8994_ldo_desc[id],
168 &config);
169 if (IS_ERR(ldo->regulator)) {
170 ret = PTR_ERR(ldo->regulator);
171 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
172 id + 1, ret);
173 goto err;
174 }
175
176 platform_set_drvdata(pdev, ldo);
177
178 return 0;
179
180err:
181 return ret;
182}
183
184static struct platform_driver wm8994_ldo_driver = {
185 .probe = wm8994_ldo_probe,
186 .driver = {
187 .name = "wm8994-ldo",
188 .owner = THIS_MODULE,
189 },
190};
191
192module_platform_driver(wm8994_ldo_driver);
193
194/* Module information */
195MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
196MODULE_DESCRIPTION("WM8994 LDO driver");
197MODULE_LICENSE("GPL");
198MODULE_ALIAS("platform:wm8994-ldo");