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49d8c599 YZ |
1 | /* |
2 | * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver. | |
3 | * | |
4 | * Supported Part Numbers: | |
5 | * FAN53555UC00X/01X/03X/04X/05X | |
6 | * | |
7 | * Copyright (c) 2012 Marvell Technology Ltd. | |
8 | * Yunfan Zhang <yfzhang@marvell.com> | |
9 | * | |
10 | * This package is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | #include <linux/module.h> | |
16 | #include <linux/param.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/regulator/driver.h> | |
20 | #include <linux/regulator/machine.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/regulator/fan53555.h> | |
25 | ||
26 | /* Voltage setting */ | |
27 | #define FAN53555_VSEL0 0x00 | |
28 | #define FAN53555_VSEL1 0x01 | |
29 | /* Control register */ | |
30 | #define FAN53555_CONTROL 0x02 | |
31 | /* IC Type */ | |
32 | #define FAN53555_ID1 0x03 | |
33 | /* IC mask version */ | |
34 | #define FAN53555_ID2 0x04 | |
35 | /* Monitor register */ | |
36 | #define FAN53555_MONITOR 0x05 | |
37 | ||
38 | /* VSEL bit definitions */ | |
39 | #define VSEL_BUCK_EN (1 << 7) | |
40 | #define VSEL_MODE (1 << 6) | |
41 | #define VSEL_NSEL_MASK 0x3F | |
42 | /* Chip ID and Verison */ | |
43 | #define DIE_ID 0x0F /* ID1 */ | |
44 | #define DIE_REV 0x0F /* ID2 */ | |
45 | /* Control bit definitions */ | |
46 | #define CTL_OUTPUT_DISCHG (1 << 7) | |
47 | #define CTL_SLEW_MASK (0x7 << 4) | |
48 | #define CTL_SLEW_SHIFT 4 | |
49 | #define CTL_RESET (1 << 2) | |
50 | ||
51 | #define FAN53555_NVOLTAGES 64 /* Numbers of voltages */ | |
52 | ||
53 | /* IC Type */ | |
54 | enum { | |
55 | FAN53555_CHIP_ID_00 = 0, | |
56 | FAN53555_CHIP_ID_01, | |
57 | FAN53555_CHIP_ID_02, | |
58 | FAN53555_CHIP_ID_03, | |
59 | FAN53555_CHIP_ID_04, | |
60 | FAN53555_CHIP_ID_05, | |
61 | }; | |
62 | ||
63 | struct fan53555_device_info { | |
64 | struct regmap *regmap; | |
65 | struct device *dev; | |
66 | struct regulator_desc desc; | |
67 | struct regulator_dev *rdev; | |
68 | struct regulator_init_data *regulator; | |
69 | /* IC Type and Rev */ | |
70 | int chip_id; | |
71 | int chip_rev; | |
72 | /* Voltage setting register */ | |
73 | unsigned int vol_reg; | |
74 | unsigned int sleep_reg; | |
75 | /* Voltage range and step(linear) */ | |
76 | unsigned int vsel_min; | |
49d8c599 YZ |
77 | unsigned int vsel_step; |
78 | /* Voltage slew rate limiting */ | |
79 | unsigned int slew_rate; | |
80 | /* Sleep voltage cache */ | |
81 | unsigned int sleep_vol_cache; | |
82 | }; | |
83 | ||
84 | static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV) | |
85 | { | |
86 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
87 | int ret; | |
88 | ||
89 | if (di->sleep_vol_cache == uV) | |
90 | return 0; | |
91 | ret = regulator_map_voltage_linear(rdev, uV, uV); | |
92 | if (ret < 0) | |
145fe1e1 | 93 | return ret; |
49d8c599 YZ |
94 | ret = regmap_update_bits(di->regmap, di->sleep_reg, |
95 | VSEL_NSEL_MASK, ret); | |
96 | if (ret < 0) | |
145fe1e1 | 97 | return ret; |
49d8c599 YZ |
98 | /* Cache the sleep voltage setting. |
99 | * Might not be the real voltage which is rounded */ | |
100 | di->sleep_vol_cache = uV; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
106 | { | |
107 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
108 | ||
109 | switch (mode) { | |
110 | case REGULATOR_MODE_FAST: | |
111 | regmap_update_bits(di->regmap, di->vol_reg, | |
112 | VSEL_MODE, VSEL_MODE); | |
113 | break; | |
114 | case REGULATOR_MODE_NORMAL: | |
115 | regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0); | |
116 | break; | |
117 | default: | |
118 | return -EINVAL; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static unsigned int fan53555_get_mode(struct regulator_dev *rdev) | |
124 | { | |
125 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
126 | unsigned int val; | |
127 | int ret = 0; | |
128 | ||
129 | ret = regmap_read(di->regmap, di->vol_reg, &val); | |
130 | if (ret < 0) | |
131 | return ret; | |
132 | if (val & VSEL_MODE) | |
133 | return REGULATOR_MODE_FAST; | |
134 | else | |
135 | return REGULATOR_MODE_NORMAL; | |
136 | } | |
137 | ||
138 | static struct regulator_ops fan53555_regulator_ops = { | |
139 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
140 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
141 | .map_voltage = regulator_map_voltage_linear, | |
142 | .list_voltage = regulator_list_voltage_linear, | |
143 | .set_suspend_voltage = fan53555_set_suspend_voltage, | |
144 | .enable = regulator_enable_regmap, | |
145 | .disable = regulator_disable_regmap, | |
146 | .is_enabled = regulator_is_enabled_regmap, | |
147 | .set_mode = fan53555_set_mode, | |
148 | .get_mode = fan53555_get_mode, | |
149 | }; | |
150 | ||
151 | /* For 00,01,03,05 options: | |
152 | * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V. | |
153 | * For 04 option: | |
154 | * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V. | |
155 | * */ | |
156 | static int fan53555_device_setup(struct fan53555_device_info *di, | |
157 | struct fan53555_platform_data *pdata) | |
158 | { | |
159 | unsigned int reg, data, mask; | |
160 | ||
161 | /* Setup voltage control register */ | |
162 | switch (pdata->sleep_vsel_id) { | |
163 | case FAN53555_VSEL_ID_0: | |
164 | di->sleep_reg = FAN53555_VSEL0; | |
165 | di->vol_reg = FAN53555_VSEL1; | |
166 | break; | |
167 | case FAN53555_VSEL_ID_1: | |
168 | di->sleep_reg = FAN53555_VSEL1; | |
169 | di->vol_reg = FAN53555_VSEL0; | |
170 | break; | |
171 | default: | |
172 | dev_err(di->dev, "Invalid VSEL ID!\n"); | |
173 | return -EINVAL; | |
174 | } | |
175 | /* Init voltage range and step */ | |
176 | switch (di->chip_id) { | |
177 | case FAN53555_CHIP_ID_00: | |
178 | case FAN53555_CHIP_ID_01: | |
179 | case FAN53555_CHIP_ID_03: | |
180 | case FAN53555_CHIP_ID_05: | |
181 | di->vsel_min = 600000; | |
49d8c599 YZ |
182 | di->vsel_step = 10000; |
183 | break; | |
184 | case FAN53555_CHIP_ID_04: | |
185 | di->vsel_min = 603000; | |
49d8c599 YZ |
186 | di->vsel_step = 12826; |
187 | break; | |
188 | default: | |
189 | dev_err(di->dev, | |
190 | "Chip ID[%d]\n not supported!\n", di->chip_id); | |
191 | return -EINVAL; | |
192 | } | |
193 | /* Init slew rate */ | |
194 | if (pdata->slew_rate & 0x7) | |
195 | di->slew_rate = pdata->slew_rate; | |
196 | else | |
197 | di->slew_rate = FAN53555_SLEW_RATE_64MV; | |
198 | reg = FAN53555_CONTROL; | |
199 | data = di->slew_rate << CTL_SLEW_SHIFT; | |
200 | mask = CTL_SLEW_MASK; | |
201 | return regmap_update_bits(di->regmap, reg, mask, data); | |
202 | } | |
203 | ||
204 | static int fan53555_regulator_register(struct fan53555_device_info *di, | |
205 | struct regulator_config *config) | |
206 | { | |
207 | struct regulator_desc *rdesc = &di->desc; | |
208 | ||
209 | rdesc->name = "fan53555-reg"; | |
210 | rdesc->ops = &fan53555_regulator_ops; | |
211 | rdesc->type = REGULATOR_VOLTAGE; | |
212 | rdesc->n_voltages = FAN53555_NVOLTAGES; | |
213 | rdesc->enable_reg = di->vol_reg; | |
214 | rdesc->enable_mask = VSEL_BUCK_EN; | |
215 | rdesc->min_uV = di->vsel_min; | |
216 | rdesc->uV_step = di->vsel_step; | |
217 | rdesc->vsel_reg = di->vol_reg; | |
218 | rdesc->vsel_mask = VSEL_NSEL_MASK; | |
219 | rdesc->owner = THIS_MODULE; | |
220 | ||
b15f5f76 | 221 | di->rdev = devm_regulator_register(di->dev, &di->desc, config); |
8c6ffba0 | 222 | return PTR_ERR_OR_ZERO(di->rdev); |
49d8c599 YZ |
223 | } |
224 | ||
225 | static struct regmap_config fan53555_regmap_config = { | |
226 | .reg_bits = 8, | |
227 | .val_bits = 8, | |
228 | }; | |
229 | ||
a5023574 | 230 | static int fan53555_regulator_probe(struct i2c_client *client, |
49d8c599 YZ |
231 | const struct i2c_device_id *id) |
232 | { | |
233 | struct fan53555_device_info *di; | |
234 | struct fan53555_platform_data *pdata; | |
235 | struct regulator_config config = { }; | |
236 | unsigned int val; | |
237 | int ret; | |
238 | ||
dff91d0b | 239 | pdata = dev_get_platdata(&client->dev); |
49d8c599 YZ |
240 | if (!pdata || !pdata->regulator) { |
241 | dev_err(&client->dev, "Platform data not found!\n"); | |
242 | return -ENODEV; | |
243 | } | |
244 | ||
245 | di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info), | |
246 | GFP_KERNEL); | |
df948bbf | 247 | if (!di) |
49d8c599 | 248 | return -ENOMEM; |
df948bbf | 249 | |
49d8c599 YZ |
250 | di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config); |
251 | if (IS_ERR(di->regmap)) { | |
252 | dev_err(&client->dev, "Failed to allocate regmap!\n"); | |
253 | return PTR_ERR(di->regmap); | |
254 | } | |
255 | di->dev = &client->dev; | |
256 | di->regulator = pdata->regulator; | |
257 | i2c_set_clientdata(client, di); | |
258 | /* Get chip ID */ | |
259 | ret = regmap_read(di->regmap, FAN53555_ID1, &val); | |
260 | if (ret < 0) { | |
261 | dev_err(&client->dev, "Failed to get chip ID!\n"); | |
145fe1e1 | 262 | return ret; |
49d8c599 YZ |
263 | } |
264 | di->chip_id = val & DIE_ID; | |
265 | /* Get chip revision */ | |
266 | ret = regmap_read(di->regmap, FAN53555_ID2, &val); | |
267 | if (ret < 0) { | |
268 | dev_err(&client->dev, "Failed to get chip Rev!\n"); | |
145fe1e1 | 269 | return ret; |
49d8c599 YZ |
270 | } |
271 | di->chip_rev = val & DIE_REV; | |
272 | dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n", | |
273 | di->chip_id, di->chip_rev); | |
274 | /* Device init */ | |
275 | ret = fan53555_device_setup(di, pdata); | |
276 | if (ret < 0) { | |
277 | dev_err(&client->dev, "Failed to setup device!\n"); | |
278 | return ret; | |
279 | } | |
280 | /* Register regulator */ | |
281 | config.dev = di->dev; | |
282 | config.init_data = di->regulator; | |
283 | config.regmap = di->regmap; | |
284 | config.driver_data = di; | |
285 | ret = fan53555_regulator_register(di, &config); | |
286 | if (ret < 0) | |
287 | dev_err(&client->dev, "Failed to register regulator!\n"); | |
288 | return ret; | |
289 | ||
290 | } | |
291 | ||
49d8c599 YZ |
292 | static const struct i2c_device_id fan53555_id[] = { |
293 | {"fan53555", -1}, | |
294 | { }, | |
295 | }; | |
296 | ||
297 | static struct i2c_driver fan53555_regulator_driver = { | |
298 | .driver = { | |
299 | .name = "fan53555-regulator", | |
300 | }, | |
301 | .probe = fan53555_regulator_probe, | |
49d8c599 YZ |
302 | .id_table = fan53555_id, |
303 | }; | |
304 | ||
305 | module_i2c_driver(fan53555_regulator_driver); | |
306 | ||
307 | MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>"); | |
308 | MODULE_DESCRIPTION("FAN53555 regulator driver"); | |
309 | MODULE_LICENSE("GPL v2"); |