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a71b797f HZ |
1 | /* |
2 | * Regulators driver for Maxim max8649 | |
3 | * | |
4 | * Copyright (C) 2009-2010 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/err.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regulator/driver.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
a71b797f | 18 | #include <linux/regulator/max8649.h> |
c5b68d47 | 19 | #include <linux/regmap.h> |
a71b797f HZ |
20 | |
21 | #define MAX8649_DCDC_VMIN 750000 /* uV */ | |
22 | #define MAX8649_DCDC_VMAX 1380000 /* uV */ | |
23 | #define MAX8649_DCDC_STEP 10000 /* uV */ | |
24 | #define MAX8649_VOL_MASK 0x3f | |
25 | ||
26 | /* Registers */ | |
27 | #define MAX8649_MODE0 0x00 | |
28 | #define MAX8649_MODE1 0x01 | |
29 | #define MAX8649_MODE2 0x02 | |
30 | #define MAX8649_MODE3 0x03 | |
31 | #define MAX8649_CONTROL 0x04 | |
32 | #define MAX8649_SYNC 0x05 | |
33 | #define MAX8649_RAMP 0x06 | |
34 | #define MAX8649_CHIP_ID1 0x08 | |
35 | #define MAX8649_CHIP_ID2 0x09 | |
36 | ||
37 | /* Bits */ | |
38 | #define MAX8649_EN_PD (1 << 7) | |
39 | #define MAX8649_VID0_PD (1 << 6) | |
40 | #define MAX8649_VID1_PD (1 << 5) | |
41 | #define MAX8649_VID_MASK (3 << 5) | |
42 | ||
43 | #define MAX8649_FORCE_PWM (1 << 7) | |
44 | #define MAX8649_SYNC_EXTCLK (1 << 6) | |
45 | ||
46 | #define MAX8649_EXT_MASK (3 << 6) | |
47 | ||
48 | #define MAX8649_RAMP_MASK (7 << 5) | |
49 | #define MAX8649_RAMP_DOWN (1 << 1) | |
50 | ||
51 | struct max8649_regulator_info { | |
52 | struct regulator_dev *regulator; | |
a71b797f | 53 | struct device *dev; |
c5b68d47 | 54 | struct regmap *regmap; |
a71b797f HZ |
55 | |
56 | int vol_reg; | |
57 | unsigned mode:2; /* bit[1:0] = VID1, VID0 */ | |
58 | unsigned extclk_freq:2; | |
59 | unsigned extclk:1; | |
60 | unsigned ramp_timing:3; | |
61 | unsigned ramp_down:1; | |
62 | }; | |
63 | ||
64 | /* I2C operations */ | |
65 | ||
a71b797f HZ |
66 | static inline int check_range(int min_uV, int max_uV) |
67 | { | |
68 | if ((min_uV < MAX8649_DCDC_VMIN) || (max_uV > MAX8649_DCDC_VMAX) | |
69 | || (min_uV > max_uV)) | |
70 | return -EINVAL; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index) | |
75 | { | |
76 | return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP); | |
77 | } | |
78 | ||
79 | static int max8649_get_voltage(struct regulator_dev *rdev) | |
80 | { | |
81 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 82 | unsigned int val; |
a71b797f HZ |
83 | unsigned char data; |
84 | int ret; | |
85 | ||
c5b68d47 JC |
86 | ret = regmap_read(info->regmap, info->vol_reg, &val); |
87 | if (ret != 0) | |
a71b797f | 88 | return ret; |
c5b68d47 | 89 | data = (unsigned char)val & MAX8649_VOL_MASK; |
a71b797f HZ |
90 | return max8649_list_voltage(rdev, data); |
91 | } | |
92 | ||
93 | static int max8649_set_voltage(struct regulator_dev *rdev, | |
3a93f2a9 | 94 | int min_uV, int max_uV, unsigned *selector) |
a71b797f HZ |
95 | { |
96 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
97 | unsigned char data, mask; | |
98 | ||
99 | if (check_range(min_uV, max_uV)) { | |
100 | dev_err(info->dev, "invalid voltage range (%d, %d) uV\n", | |
101 | min_uV, max_uV); | |
102 | return -EINVAL; | |
103 | } | |
104 | data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1) | |
105 | / MAX8649_DCDC_STEP; | |
106 | mask = MAX8649_VOL_MASK; | |
3a93f2a9 | 107 | *selector = data & mask; |
a71b797f | 108 | |
c5b68d47 | 109 | return regmap_update_bits(info->regmap, info->vol_reg, mask, data); |
a71b797f HZ |
110 | } |
111 | ||
112 | /* EN_PD means pulldown on EN input */ | |
113 | static int max8649_enable(struct regulator_dev *rdev) | |
114 | { | |
115 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 116 | return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0); |
a71b797f HZ |
117 | } |
118 | ||
119 | /* | |
120 | * Applied internal pulldown resistor on EN input pin. | |
121 | * If pulldown EN pin outside, it would be better. | |
122 | */ | |
123 | static int max8649_disable(struct regulator_dev *rdev) | |
124 | { | |
125 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 126 | return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, |
a71b797f HZ |
127 | MAX8649_EN_PD); |
128 | } | |
129 | ||
130 | static int max8649_is_enabled(struct regulator_dev *rdev) | |
131 | { | |
132 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 133 | unsigned int val; |
a71b797f HZ |
134 | int ret; |
135 | ||
c5b68d47 JC |
136 | ret = regmap_read(info->regmap, MAX8649_CONTROL, &val); |
137 | if (ret != 0) | |
a71b797f | 138 | return ret; |
c5b68d47 | 139 | return !((unsigned char)val & MAX8649_EN_PD); |
a71b797f HZ |
140 | } |
141 | ||
142 | static int max8649_enable_time(struct regulator_dev *rdev) | |
143 | { | |
144 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
145 | int voltage, rate, ret; | |
c5b68d47 | 146 | unsigned int val; |
a71b797f HZ |
147 | |
148 | /* get voltage */ | |
c5b68d47 JC |
149 | ret = regmap_read(info->regmap, info->vol_reg, &val); |
150 | if (ret != 0) | |
a71b797f | 151 | return ret; |
c5b68d47 | 152 | val &= MAX8649_VOL_MASK; |
9fc886a1 | 153 | voltage = max8649_list_voltage(rdev, (unsigned char)val); /* uV */ |
a71b797f HZ |
154 | |
155 | /* get rate */ | |
c5b68d47 JC |
156 | ret = regmap_read(info->regmap, MAX8649_RAMP, &val); |
157 | if (ret != 0) | |
a71b797f | 158 | return ret; |
c5b68d47 | 159 | ret = (val & MAX8649_RAMP_MASK) >> 5; |
a71b797f HZ |
160 | rate = (32 * 1000) >> ret; /* uV/uS */ |
161 | ||
e69c4997 | 162 | return DIV_ROUND_UP(voltage, rate); |
a71b797f HZ |
163 | } |
164 | ||
165 | static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
166 | { | |
167 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
168 | ||
169 | switch (mode) { | |
170 | case REGULATOR_MODE_FAST: | |
c5b68d47 JC |
171 | regmap_update_bits(info->regmap, info->vol_reg, MAX8649_FORCE_PWM, |
172 | MAX8649_FORCE_PWM); | |
a71b797f HZ |
173 | break; |
174 | case REGULATOR_MODE_NORMAL: | |
c5b68d47 JC |
175 | regmap_update_bits(info->regmap, info->vol_reg, |
176 | MAX8649_FORCE_PWM, 0); | |
a71b797f HZ |
177 | break; |
178 | default: | |
179 | return -EINVAL; | |
180 | } | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static unsigned int max8649_get_mode(struct regulator_dev *rdev) | |
185 | { | |
186 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 187 | unsigned int val; |
a71b797f HZ |
188 | int ret; |
189 | ||
c5b68d47 JC |
190 | ret = regmap_read(info->regmap, info->vol_reg, &val); |
191 | if (ret != 0) | |
192 | return ret; | |
193 | if (val & MAX8649_FORCE_PWM) | |
a71b797f HZ |
194 | return REGULATOR_MODE_FAST; |
195 | return REGULATOR_MODE_NORMAL; | |
196 | } | |
197 | ||
198 | static struct regulator_ops max8649_dcdc_ops = { | |
199 | .set_voltage = max8649_set_voltage, | |
200 | .get_voltage = max8649_get_voltage, | |
201 | .list_voltage = max8649_list_voltage, | |
202 | .enable = max8649_enable, | |
203 | .disable = max8649_disable, | |
204 | .is_enabled = max8649_is_enabled, | |
205 | .enable_time = max8649_enable_time, | |
206 | .set_mode = max8649_set_mode, | |
207 | .get_mode = max8649_get_mode, | |
208 | ||
209 | }; | |
210 | ||
211 | static struct regulator_desc dcdc_desc = { | |
212 | .name = "max8649", | |
213 | .ops = &max8649_dcdc_ops, | |
214 | .type = REGULATOR_VOLTAGE, | |
215 | .n_voltages = 1 << 6, | |
216 | .owner = THIS_MODULE, | |
217 | }; | |
218 | ||
c5b68d47 JC |
219 | static struct regmap_config max8649_regmap_config = { |
220 | .reg_bits = 8, | |
221 | .val_bits = 8, | |
222 | }; | |
223 | ||
a71b797f HZ |
224 | static int __devinit max8649_regulator_probe(struct i2c_client *client, |
225 | const struct i2c_device_id *id) | |
226 | { | |
227 | struct max8649_platform_data *pdata = client->dev.platform_data; | |
228 | struct max8649_regulator_info *info = NULL; | |
c5b68d47 | 229 | unsigned int val; |
a71b797f HZ |
230 | unsigned char data; |
231 | int ret; | |
232 | ||
233 | info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL); | |
234 | if (!info) { | |
235 | dev_err(&client->dev, "No enough memory\n"); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
c5b68d47 JC |
239 | info->regmap = regmap_init_i2c(client, &max8649_regmap_config); |
240 | if (IS_ERR(info->regmap)) { | |
241 | ret = PTR_ERR(info->regmap); | |
242 | dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); | |
243 | goto fail; | |
244 | } | |
245 | ||
a71b797f | 246 | info->dev = &client->dev; |
a71b797f HZ |
247 | i2c_set_clientdata(client, info); |
248 | ||
249 | info->mode = pdata->mode; | |
250 | switch (info->mode) { | |
251 | case 0: | |
252 | info->vol_reg = MAX8649_MODE0; | |
253 | break; | |
254 | case 1: | |
255 | info->vol_reg = MAX8649_MODE1; | |
256 | break; | |
257 | case 2: | |
258 | info->vol_reg = MAX8649_MODE2; | |
259 | break; | |
260 | case 3: | |
261 | info->vol_reg = MAX8649_MODE3; | |
262 | break; | |
263 | default: | |
264 | break; | |
265 | } | |
266 | ||
c5b68d47 JC |
267 | ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val); |
268 | if (ret != 0) { | |
a71b797f HZ |
269 | dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n", |
270 | ret); | |
271 | goto out; | |
272 | } | |
273 | dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret); | |
274 | ||
275 | /* enable VID0 & VID1 */ | |
c5b68d47 | 276 | regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0); |
a71b797f HZ |
277 | |
278 | /* enable/disable external clock synchronization */ | |
279 | info->extclk = pdata->extclk; | |
280 | data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0; | |
c5b68d47 | 281 | regmap_update_bits(info->regmap, info->vol_reg, MAX8649_SYNC_EXTCLK, data); |
a71b797f HZ |
282 | if (info->extclk) { |
283 | /* set external clock frequency */ | |
284 | info->extclk_freq = pdata->extclk_freq; | |
c5b68d47 JC |
285 | regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK, |
286 | info->extclk_freq << 6); | |
a71b797f HZ |
287 | } |
288 | ||
289 | if (pdata->ramp_timing) { | |
290 | info->ramp_timing = pdata->ramp_timing; | |
c5b68d47 JC |
291 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK, |
292 | info->ramp_timing << 5); | |
a71b797f HZ |
293 | } |
294 | ||
295 | info->ramp_down = pdata->ramp_down; | |
296 | if (info->ramp_down) { | |
c5b68d47 JC |
297 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN, |
298 | MAX8649_RAMP_DOWN); | |
a71b797f HZ |
299 | } |
300 | ||
301 | info->regulator = regulator_register(&dcdc_desc, &client->dev, | |
2c043bcb | 302 | pdata->regulator, info, NULL); |
a71b797f HZ |
303 | if (IS_ERR(info->regulator)) { |
304 | dev_err(info->dev, "failed to register regulator %s\n", | |
305 | dcdc_desc.name); | |
306 | ret = PTR_ERR(info->regulator); | |
307 | goto out; | |
308 | } | |
309 | ||
310 | dev_info(info->dev, "Max8649 regulator device is detected.\n"); | |
311 | return 0; | |
312 | out: | |
c5b68d47 JC |
313 | regmap_exit(info->regmap); |
314 | fail: | |
a71b797f HZ |
315 | kfree(info); |
316 | return ret; | |
317 | } | |
318 | ||
319 | static int __devexit max8649_regulator_remove(struct i2c_client *client) | |
320 | { | |
321 | struct max8649_regulator_info *info = i2c_get_clientdata(client); | |
322 | ||
323 | if (info) { | |
324 | if (info->regulator) | |
325 | regulator_unregister(info->regulator); | |
c5b68d47 | 326 | regmap_exit(info->regmap); |
a71b797f HZ |
327 | kfree(info); |
328 | } | |
a71b797f HZ |
329 | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static const struct i2c_device_id max8649_id[] = { | |
334 | { "max8649", 0 }, | |
335 | { } | |
336 | }; | |
337 | MODULE_DEVICE_TABLE(i2c, max8649_id); | |
338 | ||
339 | static struct i2c_driver max8649_driver = { | |
340 | .probe = max8649_regulator_probe, | |
341 | .remove = __devexit_p(max8649_regulator_remove), | |
342 | .driver = { | |
343 | .name = "max8649", | |
344 | }, | |
345 | .id_table = max8649_id, | |
346 | }; | |
347 | ||
348 | static int __init max8649_init(void) | |
349 | { | |
350 | return i2c_add_driver(&max8649_driver); | |
351 | } | |
352 | subsys_initcall(max8649_init); | |
353 | ||
354 | static void __exit max8649_exit(void) | |
355 | { | |
356 | i2c_del_driver(&max8649_driver); | |
357 | } | |
358 | module_exit(max8649_exit); | |
359 | ||
360 | /* Module information */ | |
361 | MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver"); | |
362 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
363 | MODULE_LICENSE("GPL"); | |
364 |