Commit | Line | Data |
---|---|---|
08ff6f2a HZ |
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> | |
65602c32 | 12 | #include <linux/module.h> |
08ff6f2a HZ |
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 | ||
21 | #define SD1_DVM_VMIN 850000 | |
22 | #define SD1_DVM_VMAX 1000000 | |
23 | #define SD1_DVM_STEP 50000 | |
24 | #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ | |
25 | #define SD1_DVM_EN 6 /* SDV1 bit 6 */ | |
26 | ||
65364e9a KL |
27 | /* bit definitions in LDO control registers */ |
28 | #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ | |
29 | #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ | |
30 | #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ | |
31 | #define LDO_I2C_EN 0x1 /* Enable by i2c */ | |
32 | #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ | |
33 | #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ | |
db13c040 | 34 | |
08ff6f2a HZ |
35 | struct max8925_regulator_info { |
36 | struct regulator_desc desc; | |
37 | struct regulator_dev *regulator; | |
38 | struct i2c_client *i2c; | |
39 | struct max8925_chip *chip; | |
40 | ||
08ff6f2a | 41 | int vol_reg; |
08ff6f2a HZ |
42 | int enable_reg; |
43 | }; | |
44 | ||
cd8318cb AL |
45 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
46 | unsigned int selector) | |
08ff6f2a HZ |
47 | { |
48 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
cd8318cb | 49 | unsigned char mask = rdev->desc->n_voltages - 1; |
08ff6f2a | 50 | |
cd8318cb | 51 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
08ff6f2a HZ |
52 | } |
53 | ||
3c8983b9 | 54 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
08ff6f2a HZ |
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; | |
7f52ba77 AL |
63 | mask = rdev->desc->n_voltages - 1; |
64 | data = ret & mask; | |
08ff6f2a | 65 | |
3c8983b9 | 66 | return data; |
08ff6f2a HZ |
67 | } |
68 | ||
69 | static 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, | |
65364e9a KL |
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); | |
08ff6f2a HZ |
78 | } |
79 | ||
80 | static 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, | |
65364e9a KL |
85 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
86 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
87 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); | |
08ff6f2a HZ |
88 | } |
89 | ||
90 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
91 | { | |
92 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65364e9a | 93 | int ldo_seq, ret; |
08ff6f2a | 94 | |
4b99fef0 | 95 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
96 | if (ret < 0) |
97 | return ret; | |
65364e9a KL |
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); | |
08ff6f2a HZ |
103 | } |
104 | ||
105 | static 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 | ||
5db6d09a | 113 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
08ff6f2a HZ |
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 | ||
120 | static 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 | ||
128 | static 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 | ||
135 | static struct regulator_ops max8925_regulator_sdv_ops = { | |
cd8318cb | 136 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 137 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 138 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 139 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
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 | ||
148 | static struct regulator_ops max8925_regulator_ldo_ops = { | |
cd8318cb | 149 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 150 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 151 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 152 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
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, \ | |
7f52ba77 | 166 | .n_voltages = 64, \ |
4093e739 AL |
167 | .min_uV = min * 1000, \ |
168 | .uV_step = step * 1000, \ | |
08ff6f2a | 169 | }, \ |
08ff6f2a | 170 | .vol_reg = MAX8925_SDV##_id, \ |
08ff6f2a | 171 | .enable_reg = MAX8925_SDCTL##_id, \ |
08ff6f2a HZ |
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, \ | |
7f52ba77 | 182 | .n_voltages = 64, \ |
4093e739 AL |
183 | .min_uV = min * 1000, \ |
184 | .uV_step = step * 1000, \ | |
08ff6f2a | 185 | }, \ |
08ff6f2a | 186 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
08ff6f2a | 187 | .enable_reg = MAX8925_LDOCTL##_id, \ |
08ff6f2a HZ |
188 | } |
189 | ||
190 | static struct max8925_regulator_info max8925_regulator_info[] = { | |
191 | MAX8925_SDV(1, 637.5, 1425, 12.5), | |
192 | MAX8925_SDV(2, 650, 2225, 25), | |
193 | MAX8925_SDV(3, 750, 3900, 50), | |
194 | ||
195 | MAX8925_LDO(1, 750, 3900, 50), | |
196 | MAX8925_LDO(2, 650, 2250, 25), | |
197 | MAX8925_LDO(3, 650, 2250, 25), | |
198 | MAX8925_LDO(4, 750, 3900, 50), | |
199 | MAX8925_LDO(5, 750, 3900, 50), | |
200 | MAX8925_LDO(6, 750, 3900, 50), | |
201 | MAX8925_LDO(7, 750, 3900, 50), | |
202 | MAX8925_LDO(8, 750, 3900, 50), | |
203 | MAX8925_LDO(9, 750, 3900, 50), | |
204 | MAX8925_LDO(10, 750, 3900, 50), | |
205 | MAX8925_LDO(11, 750, 3900, 50), | |
206 | MAX8925_LDO(12, 750, 3900, 50), | |
207 | MAX8925_LDO(13, 750, 3900, 50), | |
208 | MAX8925_LDO(14, 750, 3900, 50), | |
209 | MAX8925_LDO(15, 750, 3900, 50), | |
210 | MAX8925_LDO(16, 750, 3900, 50), | |
211 | MAX8925_LDO(17, 650, 2250, 25), | |
212 | MAX8925_LDO(18, 650, 2250, 25), | |
213 | MAX8925_LDO(19, 750, 3900, 50), | |
214 | MAX8925_LDO(20, 750, 3900, 50), | |
215 | }; | |
216 | ||
3fff6c04 | 217 | static struct max8925_regulator_info * __devinit find_regulator_info(int id) |
08ff6f2a HZ |
218 | { |
219 | struct max8925_regulator_info *ri; | |
220 | int i; | |
221 | ||
222 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { | |
223 | ri = &max8925_regulator_info[i]; | |
224 | if (ri->desc.id == id) | |
225 | return ri; | |
226 | } | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | static int __devinit max8925_regulator_probe(struct platform_device *pdev) | |
231 | { | |
232 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
233 | struct max8925_platform_data *pdata = chip->dev->platform_data; | |
c172708d | 234 | struct regulator_config config = { }; |
3fff6c04 | 235 | struct max8925_regulator_info *ri; |
08ff6f2a HZ |
236 | struct regulator_dev *rdev; |
237 | ||
238 | ri = find_regulator_info(pdev->id); | |
239 | if (ri == NULL) { | |
240 | dev_err(&pdev->dev, "invalid regulator ID specified\n"); | |
241 | return -EINVAL; | |
242 | } | |
243 | ri->i2c = chip->i2c; | |
244 | ri->chip = chip; | |
245 | ||
c172708d MB |
246 | config.dev = &pdev->dev; |
247 | config.init_data = pdata->regulator[pdev->id]; | |
248 | config.driver_data = ri; | |
249 | ||
250 | rdev = regulator_register(&ri->desc, &config); | |
08ff6f2a HZ |
251 | if (IS_ERR(rdev)) { |
252 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
253 | ri->desc.name); | |
254 | return PTR_ERR(rdev); | |
255 | } | |
256 | ||
257 | platform_set_drvdata(pdev, rdev); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int __devexit max8925_regulator_remove(struct platform_device *pdev) | |
262 | { | |
263 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
264 | ||
3fff6c04 | 265 | platform_set_drvdata(pdev, NULL); |
08ff6f2a | 266 | regulator_unregister(rdev); |
3fff6c04 | 267 | |
08ff6f2a HZ |
268 | return 0; |
269 | } | |
270 | ||
271 | static struct platform_driver max8925_regulator_driver = { | |
272 | .driver = { | |
273 | .name = "max8925-regulator", | |
274 | .owner = THIS_MODULE, | |
275 | }, | |
276 | .probe = max8925_regulator_probe, | |
277 | .remove = __devexit_p(max8925_regulator_remove), | |
278 | }; | |
279 | ||
280 | static int __init max8925_regulator_init(void) | |
281 | { | |
282 | return platform_driver_register(&max8925_regulator_driver); | |
283 | } | |
284 | subsys_initcall(max8925_regulator_init); | |
285 | ||
286 | static void __exit max8925_regulator_exit(void) | |
287 | { | |
288 | platform_driver_unregister(&max8925_regulator_driver); | |
289 | } | |
290 | module_exit(max8925_regulator_exit); | |
291 | ||
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
294 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
295 | MODULE_ALIAS("platform:max8925-regulator"); |