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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 { | |
a71b797f | 52 | struct device *dev; |
c5b68d47 | 53 | struct regmap *regmap; |
a71b797f | 54 | |
a71b797f HZ |
55 | unsigned mode:2; /* bit[1:0] = VID1, VID0 */ |
56 | unsigned extclk_freq:2; | |
57 | unsigned extclk:1; | |
58 | unsigned ramp_timing:3; | |
59 | unsigned ramp_down:1; | |
60 | }; | |
61 | ||
a71b797f HZ |
62 | static int max8649_enable_time(struct regulator_dev *rdev) |
63 | { | |
64 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
65 | int voltage, rate, ret; | |
c5b68d47 | 66 | unsigned int val; |
a71b797f HZ |
67 | |
68 | /* get voltage */ | |
817d8c2d | 69 | ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); |
c5b68d47 | 70 | if (ret != 0) |
a71b797f | 71 | return ret; |
c5b68d47 | 72 | val &= MAX8649_VOL_MASK; |
0fb737b5 | 73 | voltage = regulator_list_voltage_linear(rdev, (unsigned char)val); |
a71b797f HZ |
74 | |
75 | /* get rate */ | |
c5b68d47 JC |
76 | ret = regmap_read(info->regmap, MAX8649_RAMP, &val); |
77 | if (ret != 0) | |
a71b797f | 78 | return ret; |
c5b68d47 | 79 | ret = (val & MAX8649_RAMP_MASK) >> 5; |
a71b797f HZ |
80 | rate = (32 * 1000) >> ret; /* uV/uS */ |
81 | ||
e69c4997 | 82 | return DIV_ROUND_UP(voltage, rate); |
a71b797f HZ |
83 | } |
84 | ||
85 | static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
86 | { | |
87 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
88 | ||
89 | switch (mode) { | |
90 | case REGULATOR_MODE_FAST: | |
817d8c2d AL |
91 | regmap_update_bits(info->regmap, rdev->desc->vsel_reg, |
92 | MAX8649_FORCE_PWM, MAX8649_FORCE_PWM); | |
a71b797f HZ |
93 | break; |
94 | case REGULATOR_MODE_NORMAL: | |
817d8c2d | 95 | regmap_update_bits(info->regmap, rdev->desc->vsel_reg, |
c5b68d47 | 96 | MAX8649_FORCE_PWM, 0); |
a71b797f HZ |
97 | break; |
98 | default: | |
99 | return -EINVAL; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static unsigned int max8649_get_mode(struct regulator_dev *rdev) | |
105 | { | |
106 | struct max8649_regulator_info *info = rdev_get_drvdata(rdev); | |
c5b68d47 | 107 | unsigned int val; |
a71b797f HZ |
108 | int ret; |
109 | ||
817d8c2d | 110 | ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val); |
c5b68d47 JC |
111 | if (ret != 0) |
112 | return ret; | |
113 | if (val & MAX8649_FORCE_PWM) | |
a71b797f HZ |
114 | return REGULATOR_MODE_FAST; |
115 | return REGULATOR_MODE_NORMAL; | |
116 | } | |
117 | ||
035f3324 | 118 | static const struct regulator_ops max8649_dcdc_ops = { |
40baecee | 119 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
817d8c2d | 120 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
0fb737b5 | 121 | .list_voltage = regulator_list_voltage_linear, |
40baecee | 122 | .map_voltage = regulator_map_voltage_linear, |
ea88b132 AL |
123 | .enable = regulator_enable_regmap, |
124 | .disable = regulator_disable_regmap, | |
125 | .is_enabled = regulator_is_enabled_regmap, | |
a71b797f HZ |
126 | .enable_time = max8649_enable_time, |
127 | .set_mode = max8649_set_mode, | |
128 | .get_mode = max8649_get_mode, | |
129 | ||
130 | }; | |
131 | ||
817d8c2d | 132 | static struct regulator_desc dcdc_desc = { |
a71b797f HZ |
133 | .name = "max8649", |
134 | .ops = &max8649_dcdc_ops, | |
135 | .type = REGULATOR_VOLTAGE, | |
136 | .n_voltages = 1 << 6, | |
137 | .owner = THIS_MODULE, | |
817d8c2d | 138 | .vsel_mask = MAX8649_VOL_MASK, |
0fb737b5 AL |
139 | .min_uV = MAX8649_DCDC_VMIN, |
140 | .uV_step = MAX8649_DCDC_STEP, | |
ea88b132 AL |
141 | .enable_reg = MAX8649_CONTROL, |
142 | .enable_mask = MAX8649_EN_PD, | |
143 | .enable_is_inverted = true, | |
a71b797f HZ |
144 | }; |
145 | ||
035f3324 | 146 | static const struct regmap_config max8649_regmap_config = { |
c5b68d47 JC |
147 | .reg_bits = 8, |
148 | .val_bits = 8, | |
149 | }; | |
150 | ||
a5023574 | 151 | static int max8649_regulator_probe(struct i2c_client *client, |
a71b797f HZ |
152 | const struct i2c_device_id *id) |
153 | { | |
dff91d0b | 154 | struct max8649_platform_data *pdata = dev_get_platdata(&client->dev); |
a71b797f | 155 | struct max8649_regulator_info *info = NULL; |
b7313b89 | 156 | struct regulator_dev *regulator; |
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); | |
6e27e996 | 164 | if (!info) |
a71b797f | 165 | return -ENOMEM; |
a71b797f | 166 | |
dc553a79 | 167 | info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config); |
c5b68d47 JC |
168 | if (IS_ERR(info->regmap)) { |
169 | ret = PTR_ERR(info->regmap); | |
170 | dev_err(&client->dev, "Failed to allocate register map: %d\n", ret); | |
dc553a79 | 171 | return ret; |
c5b68d47 JC |
172 | } |
173 | ||
a71b797f | 174 | info->dev = &client->dev; |
a71b797f HZ |
175 | i2c_set_clientdata(client, info); |
176 | ||
177 | info->mode = pdata->mode; | |
178 | switch (info->mode) { | |
179 | case 0: | |
817d8c2d | 180 | dcdc_desc.vsel_reg = MAX8649_MODE0; |
a71b797f HZ |
181 | break; |
182 | case 1: | |
817d8c2d | 183 | dcdc_desc.vsel_reg = MAX8649_MODE1; |
a71b797f HZ |
184 | break; |
185 | case 2: | |
817d8c2d | 186 | dcdc_desc.vsel_reg = MAX8649_MODE2; |
a71b797f HZ |
187 | break; |
188 | case 3: | |
817d8c2d | 189 | dcdc_desc.vsel_reg = MAX8649_MODE3; |
a71b797f HZ |
190 | break; |
191 | default: | |
192 | break; | |
193 | } | |
194 | ||
c5b68d47 JC |
195 | ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val); |
196 | if (ret != 0) { | |
a71b797f HZ |
197 | dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n", |
198 | ret); | |
dc553a79 | 199 | return ret; |
a71b797f | 200 | } |
da7de6a1 | 201 | dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val); |
a71b797f HZ |
202 | |
203 | /* enable VID0 & VID1 */ | |
c5b68d47 | 204 | regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0); |
a71b797f HZ |
205 | |
206 | /* enable/disable external clock synchronization */ | |
207 | info->extclk = pdata->extclk; | |
208 | data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0; | |
817d8c2d AL |
209 | regmap_update_bits(info->regmap, dcdc_desc.vsel_reg, |
210 | MAX8649_SYNC_EXTCLK, data); | |
a71b797f HZ |
211 | if (info->extclk) { |
212 | /* set external clock frequency */ | |
213 | info->extclk_freq = pdata->extclk_freq; | |
c5b68d47 JC |
214 | regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK, |
215 | info->extclk_freq << 6); | |
a71b797f HZ |
216 | } |
217 | ||
218 | if (pdata->ramp_timing) { | |
219 | info->ramp_timing = pdata->ramp_timing; | |
c5b68d47 JC |
220 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK, |
221 | info->ramp_timing << 5); | |
a71b797f HZ |
222 | } |
223 | ||
224 | info->ramp_down = pdata->ramp_down; | |
225 | if (info->ramp_down) { | |
c5b68d47 JC |
226 | regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN, |
227 | MAX8649_RAMP_DOWN); | |
a71b797f HZ |
228 | } |
229 | ||
c172708d MB |
230 | config.dev = &client->dev; |
231 | config.init_data = pdata->regulator; | |
232 | config.driver_data = info; | |
61663171 | 233 | config.regmap = info->regmap; |
c172708d | 234 | |
b7313b89 | 235 | regulator = devm_regulator_register(&client->dev, &dcdc_desc, |
e453f92e | 236 | &config); |
b7313b89 | 237 | if (IS_ERR(regulator)) { |
a71b797f HZ |
238 | dev_err(info->dev, "failed to register regulator %s\n", |
239 | dcdc_desc.name); | |
b7313b89 | 240 | return PTR_ERR(regulator); |
a71b797f HZ |
241 | } |
242 | ||
a71b797f | 243 | return 0; |
a71b797f HZ |
244 | } |
245 | ||
a71b797f HZ |
246 | static const struct i2c_device_id max8649_id[] = { |
247 | { "max8649", 0 }, | |
248 | { } | |
249 | }; | |
250 | MODULE_DEVICE_TABLE(i2c, max8649_id); | |
251 | ||
252 | static struct i2c_driver max8649_driver = { | |
253 | .probe = max8649_regulator_probe, | |
a71b797f HZ |
254 | .driver = { |
255 | .name = "max8649", | |
256 | }, | |
257 | .id_table = max8649_id, | |
258 | }; | |
259 | ||
260 | static int __init max8649_init(void) | |
261 | { | |
262 | return i2c_add_driver(&max8649_driver); | |
263 | } | |
264 | subsys_initcall(max8649_init); | |
265 | ||
266 | static void __exit max8649_exit(void) | |
267 | { | |
268 | i2c_del_driver(&max8649_driver); | |
269 | } | |
270 | module_exit(max8649_exit); | |
271 | ||
272 | /* Module information */ | |
273 | MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver"); | |
274 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
275 | MODULE_LICENSE("GPL"); |