1/*
2 * Regulators driver for Maxim max8925
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/err.h>
15#include <linux/i2c.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19#include <linux/mfd/max8925.h>
20#include <linux/of.h>
21#include <linux/regulator/of_regulator.h>
22
23#define SD1_DVM_VMIN 850000
24#define SD1_DVM_VMAX 1000000
25#define SD1_DVM_STEP 50000
26#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
27#define SD1_DVM_EN 6 /* SDV1 bit 6 */
28
29/* bit definitions in LDO control registers */
30#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
31#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
32#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
33#define LDO_I2C_EN 0x1 /* Enable by i2c */
34#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
35#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
36
37struct max8925_regulator_info {
38 struct regulator_desc desc;
39 struct i2c_client *i2c;
40
41 int vol_reg;
42 int enable_reg;
43};
44
45static int max8925_set_voltage_sel(struct regulator_dev *rdev,
46 unsigned int selector)
47{
48 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
49 unsigned char mask = rdev->desc->n_voltages - 1;
50
51 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
52}
53
54static int max8925_get_voltage_sel(struct regulator_dev *rdev)
55{
56 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
57 unsigned char data, mask;
58 int ret;
59
60 ret = max8925_reg_read(info->i2c, info->vol_reg);
61 if (ret < 0)
62 return ret;
63 mask = rdev->desc->n_voltages - 1;
64 data = ret & mask;
65
66 return data;
67}
68
69static int max8925_enable(struct regulator_dev *rdev)
70{
71 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
72
73 return max8925_set_bits(info->i2c, info->enable_reg,
74 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
75 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
76 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
77 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
78}
79
80static int max8925_disable(struct regulator_dev *rdev)
81{
82 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
83
84 return max8925_set_bits(info->i2c, info->enable_reg,
85 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
86 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
87 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
88}
89
90static int max8925_is_enabled(struct regulator_dev *rdev)
91{
92 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
93 int ldo_seq, ret;
94
95 ret = max8925_reg_read(info->i2c, info->enable_reg);
96 if (ret < 0)
97 return ret;
98 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
99 if (ldo_seq != LDO_SEQ_I2C)
100 return 1;
101 else
102 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
103}
104
105static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
106{
107 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
108 unsigned char data, mask;
109
110 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
111 return -EINVAL;
112
113 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
114 data <<= SD1_DVM_SHIFT;
115 mask = 3 << SD1_DVM_SHIFT;
116
117 return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
118}
119
120static int max8925_set_dvm_enable(struct regulator_dev *rdev)
121{
122 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
123
124 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
125 1 << SD1_DVM_EN);
126}
127
128static int max8925_set_dvm_disable(struct regulator_dev *rdev)
129{
130 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
131
132 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
133}
134
135static const struct regulator_ops max8925_regulator_sdv_ops = {
136 .map_voltage = regulator_map_voltage_linear,
137 .list_voltage = regulator_list_voltage_linear,
138 .set_voltage_sel = max8925_set_voltage_sel,
139 .get_voltage_sel = max8925_get_voltage_sel,
140 .enable = max8925_enable,
141 .disable = max8925_disable,
142 .is_enabled = max8925_is_enabled,
143 .set_suspend_voltage = max8925_set_dvm_voltage,
144 .set_suspend_enable = max8925_set_dvm_enable,
145 .set_suspend_disable = max8925_set_dvm_disable,
146};
147
148static const struct regulator_ops max8925_regulator_ldo_ops = {
149 .map_voltage = regulator_map_voltage_linear,
150 .list_voltage = regulator_list_voltage_linear,
151 .set_voltage_sel = max8925_set_voltage_sel,
152 .get_voltage_sel = max8925_get_voltage_sel,
153 .enable = max8925_enable,
154 .disable = max8925_disable,
155 .is_enabled = max8925_is_enabled,
156};
157
158#define MAX8925_SDV(_id, min, max, step) \
159{ \
160 .desc = { \
161 .name = "SDV" #_id, \
162 .ops = &max8925_regulator_sdv_ops, \
163 .type = REGULATOR_VOLTAGE, \
164 .id = MAX8925_ID_SD##_id, \
165 .owner = THIS_MODULE, \
166 .n_voltages = 64, \
167 .min_uV = min * 1000, \
168 .uV_step = step * 1000, \
169 }, \
170 .vol_reg = MAX8925_SDV##_id, \
171 .enable_reg = MAX8925_SDCTL##_id, \
172}
173
174#define MAX8925_LDO(_id, min, max, step) \
175{ \
176 .desc = { \
177 .name = "LDO" #_id, \
178 .ops = &max8925_regulator_ldo_ops, \
179 .type = REGULATOR_VOLTAGE, \
180 .id = MAX8925_ID_LDO##_id, \
181 .owner = THIS_MODULE, \
182 .n_voltages = 64, \
183 .min_uV = min * 1000, \
184 .uV_step = step * 1000, \
185 }, \
186 .vol_reg = MAX8925_LDOVOUT##_id, \
187 .enable_reg = MAX8925_LDOCTL##_id, \
188}
189
190#ifdef CONFIG_OF
191static struct of_regulator_match max8925_regulator_matches[] = {
192 { .name = "SDV1",},
193 { .name = "SDV2",},
194 { .name = "SDV3",},
195 { .name = "LDO1",},
196 { .name = "LDO2",},
197 { .name = "LDO3",},
198 { .name = "LDO4",},
199 { .name = "LDO5",},
200 { .name = "LDO6",},
201 { .name = "LDO7",},
202 { .name = "LDO8",},
203 { .name = "LDO9",},
204 { .name = "LDO10",},
205 { .name = "LDO11",},
206 { .name = "LDO12",},
207 { .name = "LDO13",},
208 { .name = "LDO14",},
209 { .name = "LDO15",},
210 { .name = "LDO16",},
211 { .name = "LDO17",},
212 { .name = "LDO18",},
213 { .name = "LDO19",},
214 { .name = "LDO20",},
215};
216#endif
217
218static struct max8925_regulator_info max8925_regulator_info[] = {
219 MAX8925_SDV(1, 637.5, 1425, 12.5),
220 MAX8925_SDV(2, 650, 2225, 25),
221 MAX8925_SDV(3, 750, 3900, 50),
222
223 MAX8925_LDO(1, 750, 3900, 50),
224 MAX8925_LDO(2, 650, 2250, 25),
225 MAX8925_LDO(3, 650, 2250, 25),
226 MAX8925_LDO(4, 750, 3900, 50),
227 MAX8925_LDO(5, 750, 3900, 50),
228 MAX8925_LDO(6, 750, 3900, 50),
229 MAX8925_LDO(7, 750, 3900, 50),
230 MAX8925_LDO(8, 750, 3900, 50),
231 MAX8925_LDO(9, 750, 3900, 50),
232 MAX8925_LDO(10, 750, 3900, 50),
233 MAX8925_LDO(11, 750, 3900, 50),
234 MAX8925_LDO(12, 750, 3900, 50),
235 MAX8925_LDO(13, 750, 3900, 50),
236 MAX8925_LDO(14, 750, 3900, 50),
237 MAX8925_LDO(15, 750, 3900, 50),
238 MAX8925_LDO(16, 750, 3900, 50),
239 MAX8925_LDO(17, 650, 2250, 25),
240 MAX8925_LDO(18, 650, 2250, 25),
241 MAX8925_LDO(19, 750, 3900, 50),
242 MAX8925_LDO(20, 750, 3900, 50),
243};
244
245#ifdef CONFIG_OF
246static int max8925_regulator_dt_init(struct platform_device *pdev,
247 struct regulator_config *config,
248 int ridx)
249{
250 struct device_node *nproot, *np;
251 int rcount;
252
253 nproot = pdev->dev.parent->of_node;
254 if (!nproot)
255 return -ENODEV;
256 np = of_get_child_by_name(nproot, "regulators");
257 if (!np) {
258 dev_err(&pdev->dev, "failed to find regulators node\n");
259 return -ENODEV;
260 }
261
262 rcount = of_regulator_match(&pdev->dev, np,
263 &max8925_regulator_matches[ridx], 1);
264 of_node_put(np);
265 if (rcount < 0)
266 return rcount;
267 config->init_data = max8925_regulator_matches[ridx].init_data;
268 config->of_node = max8925_regulator_matches[ridx].of_node;
269
270 return 0;
271}
272#else
273#define max8925_regulator_dt_init(x, y, z) (-1)
274#endif
275
276static int max8925_regulator_probe(struct platform_device *pdev)
277{
278 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
279 struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
280 struct regulator_config config = { };
281 struct max8925_regulator_info *ri;
282 struct resource *res;
283 struct regulator_dev *rdev;
284 int i, regulator_idx;
285
286 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
287 if (!res) {
288 dev_err(&pdev->dev, "No REG resource!\n");
289 return -EINVAL;
290 }
291 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
292 ri = &max8925_regulator_info[i];
293 if (ri->vol_reg == res->start) {
294 regulator_idx = i;
295 break;
296 }
297 }
298
299 if (i == ARRAY_SIZE(max8925_regulator_info)) {
300 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
301 (unsigned long long)res->start);
302 return -EINVAL;
303 }
304 ri->i2c = chip->i2c;
305
306 config.dev = &pdev->dev;
307 config.driver_data = ri;
308
309 if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
310 if (pdata)
311 config.init_data = pdata;
312
313 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
314 if (IS_ERR(rdev)) {
315 dev_err(&pdev->dev, "failed to register regulator %s\n",
316 ri->desc.name);
317 return PTR_ERR(rdev);
318 }
319
320 platform_set_drvdata(pdev, rdev);
321 return 0;
322}
323
324static struct platform_driver max8925_regulator_driver = {
325 .driver = {
326 .name = "max8925-regulator",
327 },
328 .probe = max8925_regulator_probe,
329};
330
331static int __init max8925_regulator_init(void)
332{
333 return platform_driver_register(&max8925_regulator_driver);
334}
335subsys_initcall(max8925_regulator_init);
336
337static void __exit max8925_regulator_exit(void)
338{
339 platform_driver_unregister(&max8925_regulator_driver);
340}
341module_exit(max8925_regulator_exit);
342
343MODULE_LICENSE("GPL");
344MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
345MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
346MODULE_ALIAS("platform:max8925-regulator");
347