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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 | 55 | |
a71b797f HZ |
56 | unsigned mode:2; /* bit[1:0] = VID1, VID0 */ |
57 | unsigned extclk_freq:2; | |
58 | unsigned extclk:1; | |
59 | unsigned ramp_timing:3; | |
60 | unsigned ramp_down:1; | |
61 | }; | |
62 | ||
a71b797f HZ |
63 | static int max8649_enable_time(struct regulator_dev *rdev) |
64 | { | |
65 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
66 | int voltage, rate, ret; | |
c5b68d47 | 67 | unsigned int val; |
a71b797f HZ |
68 | |
69 | /* get voltage */ | |
817d8c2d | 70 | ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); |
c5b68d47 | 71 | if (ret != 0) |
a71b797f | 72 | return ret; |
c5b68d47 | 73 | val &= MAX8649_VOL_MASK; |
0fb737b5 | 74 | voltage = regulator_list_voltage_linear(rdev, (unsigned char)val); |
a71b797f HZ |
75 | |
76 | /* get rate */ | |
c5b68d47 JC |
77 | ret = regmap_read(info->regmap, MAX8649_RAMP, &val); |
78 | if (ret != 0) | |
a71b797f | 79 | return ret; |
c5b68d47 | 80 | ret = (val & MAX8649_RAMP_MASK) >> 5; |
a71b797f HZ |
81 | rate = (32 * 1000) >> ret; /* uV/uS */ |
82 | ||
e69c4997 | 83 | return DIV_ROUND_UP(voltage, rate); |
a71b797f HZ |
84 | } |
85 | ||
86 | static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
87 | { | |
88 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
89 | ||
90 | switch (mode) { | |
91 | case REGULATOR_MODE_FAST: | |
817d8c2d AL |
92 | regmap_update_bits(info->regmap, rdev->desc->vsel_reg, |
93 | MAX8649_FORCE_PWM, MAX8649_FORCE_PWM); | |
a71b797f HZ |
94 | break; |
95 | case REGULATOR_MODE_NORMAL: | |
817d8c2d | 96 | regmap_update_bits(info->regmap, rdev->desc->vsel_reg, |
c5b68d47 | 97 | MAX8649_FORCE_PWM, 0); |
a71b797f HZ |
98 | break; |
99 | default: | |
100 | return -EINVAL; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static unsigned int max8649_get_mode(struct regulator_dev *rdev) | |
106 | { | |
107 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 108 | unsigned int val; |
a71b797f HZ |
109 | int ret; |
110 | ||
817d8c2d | 111 | ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); |
c5b68d47 JC |
112 | if (ret != 0) |
113 | return ret; | |
114 | if (val & MAX8649_FORCE_PWM) | |
a71b797f HZ |
115 | return REGULATOR_MODE_FAST; |
116 | return REGULATOR_MODE_NORMAL; | |
117 | } | |
118 | ||
119 | static struct regulator_ops max8649_dcdc_ops = { | |
40baecee | 120 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
817d8c2d | 121 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
0fb737b5 | 122 | .list_voltage = regulator_list_voltage_linear, |
40baecee | 123 | .map_voltage = regulator_map_voltage_linear, |
ea88b132 AL |
124 | .enable = regulator_enable_regmap, |
125 | .disable = regulator_disable_regmap, | |
126 | .is_enabled = regulator_is_enabled_regmap, | |
a71b797f HZ |
127 | .enable_time = max8649_enable_time, |
128 | .set_mode = max8649_set_mode, | |
129 | .get_mode = max8649_get_mode, | |
130 | ||
131 | }; | |
132 | ||
817d8c2d | 133 | static struct regulator_desc dcdc_desc = { |
a71b797f HZ |
134 | .name = "max8649", |
135 | .ops = &max8649_dcdc_ops, | |
136 | .type = REGULATOR_VOLTAGE, | |
137 | .n_voltages = 1 << 6, | |
138 | .owner = THIS_MODULE, | |
817d8c2d | 139 | .vsel_mask = MAX8649_VOL_MASK, |
0fb737b5 AL |
140 | .min_uV = MAX8649_DCDC_VMIN, |
141 | .uV_step = MAX8649_DCDC_STEP, | |
ea88b132 AL |
142 | .enable_reg = MAX8649_CONTROL, |
143 | .enable_mask = MAX8649_EN_PD, | |
144 | .enable_is_inverted = true, | |
a71b797f HZ |
145 | }; |
146 | ||
c5b68d47 JC |
147 | static struct regmap_config max8649_regmap_config = { |
148 | .reg_bits = 8, | |
149 | .val_bits = 8, | |
150 | }; | |
151 | ||
a5023574 | 152 | static int max8649_regulator_probe(struct i2c_client *client, |
a71b797f HZ |
153 | const struct i2c_device_id *id) |
154 | { | |
155 | struct max8649_platform_data *pdata = client->dev.platform_data; | |
156 | struct max8649_regulator_info *info = NULL; | |
c172708d | 157 | struct regulator_config config = { }; |
c5b68d47 | 158 | unsigned int val; |
a71b797f HZ |
159 | unsigned char data; |
160 | int ret; | |
161 | ||
dc553a79 AL |
162 | info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info), |
163 | GFP_KERNEL); | |
a71b797f HZ |
164 | if (!info) { |
165 | dev_err(&client->dev, "No enough memory\n"); | |
166 | return -ENOMEM; | |
167 | } | |
168 | ||
dc553a79 | 169 | info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config); |
c5b68d47 JC |
170 | if (IS_ERR(info->regmap)) { |
171 | ret = PTR_ERR(info->regmap); | |
172 | dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); | |
dc553a79 | 173 | return ret; |
c5b68d47 JC |
174 | } |
175 | ||
a71b797f | 176 | info->dev = &client->dev; |
a71b797f HZ |
177 | i2c_set_clientdata(client, info); |
178 | ||
179 | info->mode = pdata->mode; | |
180 | switch (info->mode) { | |
181 | case 0: | |
817d8c2d | 182 | dcdc_desc.vsel_reg = MAX8649_MODE0; |
a71b797f HZ |
183 | break; |
184 | case 1: | |
817d8c2d | 185 | dcdc_desc.vsel_reg = MAX8649_MODE1; |
a71b797f HZ |
186 | break; |
187 | case 2: | |
817d8c2d | 188 | dcdc_desc.vsel_reg = MAX8649_MODE2; |
a71b797f HZ |
189 | break; |
190 | case 3: | |
817d8c2d | 191 | dcdc_desc.vsel_reg = MAX8649_MODE3; |
a71b797f HZ |
192 | break; |
193 | default: | |
194 | break; | |
195 | } | |
196 | ||
c5b68d47 JC |
197 | ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val); |
198 | if (ret != 0) { | |
a71b797f HZ |
199 | dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n", |
200 | ret); | |
dc553a79 | 201 | return ret; |
a71b797f | 202 | } |
da7de6a1 | 203 | dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val); |
a71b797f HZ |
204 | |
205 | /* enable VID0 & VID1 */ | |
c5b68d47 | 206 | regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0); |
a71b797f HZ |
207 | |
208 | /* enable/disable external clock synchronization */ | |
209 | info->extclk = pdata->extclk; | |
210 | data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0; | |
817d8c2d AL |
211 | regmap_update_bits(info->regmap, dcdc_desc.vsel_reg, |
212 | MAX8649_SYNC_EXTCLK, data); | |
a71b797f HZ |
213 | if (info->extclk) { |
214 | /* set external clock frequency */ | |
215 | info->extclk_freq = pdata->extclk_freq; | |
c5b68d47 JC |
216 | regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK, |
217 | info->extclk_freq << 6); | |
a71b797f HZ |
218 | } |
219 | ||
220 | if (pdata->ramp_timing) { | |
221 | info->ramp_timing = pdata->ramp_timing; | |
c5b68d47 JC |
222 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK, |
223 | info->ramp_timing << 5); | |
a71b797f HZ |
224 | } |
225 | ||
226 | info->ramp_down = pdata->ramp_down; | |
227 | if (info->ramp_down) { | |
c5b68d47 JC |
228 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN, |
229 | MAX8649_RAMP_DOWN); | |
a71b797f HZ |
230 | } |
231 | ||
c172708d MB |
232 | config.dev = &client->dev; |
233 | config.init_data = pdata->regulator; | |
234 | config.driver_data = info; | |
61663171 | 235 | config.regmap = info->regmap; |
c172708d MB |
236 | |
237 | info->regulator = regulator_register(&dcdc_desc, &config); | |
a71b797f HZ |
238 | if (IS_ERR(info->regulator)) { |
239 | dev_err(info->dev, "failed to register regulator %s\n", | |
240 | dcdc_desc.name); | |
dc553a79 | 241 | return PTR_ERR(info->regulator); |
a71b797f HZ |
242 | } |
243 | ||
a71b797f | 244 | return 0; |
a71b797f HZ |
245 | } |
246 | ||
8dc995f5 | 247 | static int max8649_regulator_remove(struct i2c_client *client) |
a71b797f HZ |
248 | { |
249 | struct max8649_regulator_info *info = i2c_get_clientdata(client); | |
250 | ||
020501f1 AL |
251 | if (info) |
252 | regulator_unregister(info->regulator); | |
a71b797f HZ |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static const struct i2c_device_id max8649_id[] = { | |
258 | { "max8649", 0 }, | |
259 | { } | |
260 | }; | |
261 | MODULE_DEVICE_TABLE(i2c, max8649_id); | |
262 | ||
263 | static struct i2c_driver max8649_driver = { | |
264 | .probe = max8649_regulator_probe, | |
5eb9f2b9 | 265 | .remove = max8649_regulator_remove, |
a71b797f HZ |
266 | .driver = { |
267 | .name = "max8649", | |
268 | }, | |
269 | .id_table = max8649_id, | |
270 | }; | |
271 | ||
272 | static int __init max8649_init(void) | |
273 | { | |
274 | return i2c_add_driver(&max8649_driver); | |
275 | } | |
276 | subsys_initcall(max8649_init); | |
277 | ||
278 | static void __exit max8649_exit(void) | |
279 | { | |
280 | i2c_del_driver(&max8649_driver); | |
281 | } | |
282 | module_exit(max8649_exit); | |
283 | ||
284 | /* Module information */ | |
285 | MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver"); | |
286 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
287 | MODULE_LICENSE("GPL"); |