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1028a37d JB |
1 | /* |
2 | * da9211-regulator.c - Regulator device driver for DA9211 | |
3 | * Copyright (C) 2014 Dialog Semiconductor Ltd. | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Library General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Library General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/err.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/regulator/driver.h> | |
23 | #include <linux/regulator/machine.h> | |
24 | #include <linux/regmap.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/regulator/da9211.h> | |
28 | #include "da9211-regulator.h" | |
29 | ||
30 | #define DA9211_BUCK_MODE_SLEEP 1 | |
31 | #define DA9211_BUCK_MODE_SYNC 2 | |
32 | #define DA9211_BUCK_MODE_AUTO 3 | |
33 | ||
34 | /* DA9211 REGULATOR IDs */ | |
35 | #define DA9211_ID_BUCKA 0 | |
36 | #define DA9211_ID_BUCKB 1 | |
37 | ||
38 | struct da9211 { | |
39 | struct device *dev; | |
40 | struct regmap *regmap; | |
41 | struct da9211_pdata *pdata; | |
42 | struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; | |
43 | int num_regulator; | |
44 | int chip_irq; | |
45 | }; | |
46 | ||
47 | static const struct regmap_range_cfg da9211_regmap_range[] = { | |
48 | { | |
49 | .selector_reg = DA9211_REG_PAGE_CON, | |
50 | .selector_mask = DA9211_REG_PAGE_MASK, | |
51 | .selector_shift = DA9211_REG_PAGE_SHIFT, | |
52 | .window_start = 0, | |
53 | .window_len = 256, | |
54 | .range_min = 0, | |
55 | .range_max = 2*256, | |
56 | }, | |
57 | }; | |
58 | ||
59 | static const struct regmap_config da9211_regmap_config = { | |
60 | .reg_bits = 8, | |
61 | .val_bits = 8, | |
62 | .max_register = 2 * 256, | |
63 | .ranges = da9211_regmap_range, | |
64 | .num_ranges = ARRAY_SIZE(da9211_regmap_range), | |
65 | }; | |
66 | ||
67 | /* Default limits measured in millivolts and milliamps */ | |
68 | #define DA9211_MIN_MV 300 | |
69 | #define DA9211_MAX_MV 1570 | |
70 | #define DA9211_STEP_MV 10 | |
71 | ||
72 | /* Current limits for buck (uA) indices corresponds with register values */ | |
73 | static const int da9211_current_limits[] = { | |
74 | 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, | |
75 | 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 | |
76 | }; | |
77 | ||
78 | static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) | |
79 | { | |
80 | int id = rdev_get_id(rdev); | |
81 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
82 | unsigned int data; | |
83 | int ret, mode = 0; | |
84 | ||
85 | ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); | |
86 | if (ret < 0) | |
87 | return ret; | |
88 | ||
89 | switch (data & 0x03) { | |
90 | case DA9211_BUCK_MODE_SYNC: | |
91 | mode = REGULATOR_MODE_FAST; | |
92 | break; | |
93 | case DA9211_BUCK_MODE_AUTO: | |
94 | mode = REGULATOR_MODE_NORMAL; | |
95 | break; | |
96 | case DA9211_BUCK_MODE_SLEEP: | |
97 | mode = REGULATOR_MODE_STANDBY; | |
98 | break; | |
99 | } | |
100 | ||
101 | return mode; | |
102 | } | |
103 | ||
104 | static int da9211_buck_set_mode(struct regulator_dev *rdev, | |
105 | unsigned int mode) | |
106 | { | |
107 | int id = rdev_get_id(rdev); | |
108 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
109 | int val = 0; | |
110 | ||
111 | switch (mode) { | |
112 | case REGULATOR_MODE_FAST: | |
113 | val = DA9211_BUCK_MODE_SYNC; | |
114 | break; | |
115 | case REGULATOR_MODE_NORMAL: | |
116 | val = DA9211_BUCK_MODE_AUTO; | |
117 | break; | |
118 | case REGULATOR_MODE_STANDBY: | |
119 | val = DA9211_BUCK_MODE_SLEEP; | |
120 | break; | |
121 | } | |
122 | ||
123 | return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, | |
124 | 0x03, val); | |
125 | } | |
126 | ||
127 | static int da9211_set_current_limit(struct regulator_dev *rdev, int min, | |
128 | int max) | |
129 | { | |
130 | int id = rdev_get_id(rdev); | |
131 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
132 | int i; | |
133 | ||
134 | /* search for closest to maximum */ | |
135 | for (i = ARRAY_SIZE(da9211_current_limits)-1; i >= 0; i--) { | |
136 | if (min <= da9211_current_limits[i] && | |
137 | max >= da9211_current_limits[i]) { | |
138 | return regmap_update_bits(chip->regmap, | |
139 | DA9211_REG_BUCK_ILIM, | |
140 | (0x0F << id*4), (i << id*4)); | |
141 | } | |
142 | } | |
143 | ||
144 | return -EINVAL; | |
145 | } | |
146 | ||
147 | static int da9211_get_current_limit(struct regulator_dev *rdev) | |
148 | { | |
149 | int id = rdev_get_id(rdev); | |
150 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
151 | unsigned int data; | |
152 | int ret; | |
153 | ||
154 | ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); | |
155 | if (ret < 0) | |
156 | return ret; | |
157 | ||
158 | /* select one of 16 values: 0000 (2000mA) to 1111 (5000mA) */ | |
159 | data = (data >> id*4) & 0x0F; | |
160 | return da9211_current_limits[data]; | |
161 | } | |
162 | ||
163 | static struct regulator_ops da9211_buck_ops = { | |
164 | .get_mode = da9211_buck_get_mode, | |
165 | .set_mode = da9211_buck_set_mode, | |
166 | .enable = regulator_enable_regmap, | |
167 | .disable = regulator_disable_regmap, | |
168 | .is_enabled = regulator_is_enabled_regmap, | |
169 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
170 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
171 | .list_voltage = regulator_list_voltage_linear, | |
172 | .set_current_limit = da9211_set_current_limit, | |
173 | .get_current_limit = da9211_get_current_limit, | |
174 | }; | |
175 | ||
176 | #define DA9211_BUCK(_id) \ | |
177 | {\ | |
178 | .name = #_id,\ | |
179 | .ops = &da9211_buck_ops,\ | |
180 | .type = REGULATOR_VOLTAGE,\ | |
181 | .id = DA9211_ID_##_id,\ | |
182 | .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ | |
183 | .min_uV = (DA9211_MIN_MV * 1000),\ | |
184 | .uV_step = (DA9211_STEP_MV * 1000),\ | |
185 | .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ | |
186 | .enable_mask = DA9211_BUCKA_EN,\ | |
187 | .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ | |
188 | .vsel_mask = DA9211_VBUCK_MASK,\ | |
189 | .owner = THIS_MODULE,\ | |
190 | } | |
191 | ||
192 | static struct regulator_desc da9211_regulators[] = { | |
193 | DA9211_BUCK(BUCKA), | |
194 | DA9211_BUCK(BUCKB), | |
195 | }; | |
196 | ||
197 | static irqreturn_t da9211_irq_handler(int irq, void *data) | |
198 | { | |
199 | struct da9211 *chip = data; | |
200 | int reg_val, err, ret = IRQ_NONE; | |
201 | ||
202 | err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); | |
203 | if (err < 0) | |
204 | goto error_i2c; | |
205 | ||
206 | if (reg_val & DA9211_E_OV_CURR_A) { | |
207 | regulator_notifier_call_chain(chip->rdev[0], | |
208 | REGULATOR_EVENT_OVER_CURRENT, | |
209 | rdev_get_drvdata(chip->rdev[0])); | |
210 | ||
211 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
212 | DA9211_E_OV_CURR_A); | |
213 | if (err < 0) | |
214 | goto error_i2c; | |
215 | ||
216 | ret = IRQ_HANDLED; | |
217 | } | |
218 | ||
219 | if (reg_val & DA9211_E_OV_CURR_B) { | |
220 | regulator_notifier_call_chain(chip->rdev[1], | |
221 | REGULATOR_EVENT_OVER_CURRENT, | |
222 | rdev_get_drvdata(chip->rdev[1])); | |
223 | ||
224 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
225 | DA9211_E_OV_CURR_B); | |
226 | if (err < 0) | |
227 | goto error_i2c; | |
228 | ||
229 | ret = IRQ_HANDLED; | |
230 | } | |
231 | ||
232 | return ret; | |
233 | ||
234 | error_i2c: | |
235 | dev_err(chip->dev, "I2C error : %d\n", err); | |
236 | return IRQ_NONE; | |
237 | } | |
238 | ||
239 | static int da9211_regulator_init(struct da9211 *chip) | |
240 | { | |
241 | struct regulator_config config = { }; | |
242 | int i, ret; | |
243 | unsigned int data; | |
244 | ||
245 | ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); | |
246 | if (ret < 0) { | |
247 | dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret); | |
516c1514 | 248 | return ret; |
1028a37d JB |
249 | } |
250 | ||
251 | data &= DA9211_SLAVE_SEL; | |
252 | /* If configuration for 1/2 bucks is different between platform data | |
253 | * and the register, driver should exit. | |
254 | */ | |
255 | if ((chip->pdata->num_buck == 2 && data == 0x40) | |
256 | || (chip->pdata->num_buck == 1 && data == 0x00)) { | |
257 | if (data == 0) | |
258 | chip->num_regulator = 1; | |
259 | else | |
260 | chip->num_regulator = 2; | |
261 | } else { | |
1028a37d | 262 | dev_err(chip->dev, "Configuration is mismatched\n"); |
516c1514 | 263 | return -EINVAL; |
1028a37d JB |
264 | } |
265 | ||
266 | for (i = 0; i < chip->num_regulator; i++) { | |
267 | if (chip->pdata) | |
268 | config.init_data = | |
269 | &(chip->pdata->init_data[i]); | |
270 | ||
271 | config.dev = chip->dev; | |
272 | config.driver_data = chip; | |
273 | config.regmap = chip->regmap; | |
274 | ||
275 | chip->rdev[i] = devm_regulator_register(chip->dev, | |
276 | &da9211_regulators[i], &config); | |
277 | if (IS_ERR(chip->rdev[i])) { | |
278 | dev_err(chip->dev, | |
279 | "Failed to register DA9211 regulator\n"); | |
516c1514 | 280 | return PTR_ERR(chip->rdev[i]); |
1028a37d JB |
281 | } |
282 | ||
283 | if (chip->chip_irq != 0) { | |
284 | ret = regmap_update_bits(chip->regmap, | |
285 | DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 1); | |
286 | if (ret < 0) { | |
287 | dev_err(chip->dev, | |
288 | "Failed to update mask reg: %d\n", ret); | |
516c1514 | 289 | return ret; |
1028a37d JB |
290 | } |
291 | } | |
292 | } | |
293 | ||
294 | return 0; | |
1028a37d JB |
295 | } |
296 | /* | |
297 | * I2C driver interface functions | |
298 | */ | |
299 | static int da9211_i2c_probe(struct i2c_client *i2c, | |
300 | const struct i2c_device_id *id) | |
301 | { | |
302 | struct da9211 *chip; | |
303 | int error, ret; | |
304 | ||
305 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); | |
306 | ||
307 | chip->dev = &i2c->dev; | |
308 | chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config); | |
309 | if (IS_ERR(chip->regmap)) { | |
310 | error = PTR_ERR(chip->regmap); | |
311 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", | |
312 | error); | |
313 | return error; | |
314 | } | |
315 | ||
316 | i2c_set_clientdata(i2c, chip); | |
317 | ||
318 | chip->pdata = i2c->dev.platform_data; | |
319 | if (!chip->pdata) { | |
320 | dev_err(&i2c->dev, "No platform init data supplied\n"); | |
321 | return -ENODEV; | |
322 | } | |
323 | ||
324 | chip->chip_irq = i2c->irq; | |
325 | ||
326 | if (chip->chip_irq != 0) { | |
327 | ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, | |
328 | da9211_irq_handler, | |
329 | IRQF_TRIGGER_LOW|IRQF_ONESHOT, | |
330 | "da9211", chip); | |
331 | if (ret != 0) { | |
332 | dev_err(chip->dev, "Failed to request IRQ: %d\n", | |
333 | chip->chip_irq); | |
334 | return ret; | |
335 | } | |
336 | } else { | |
337 | dev_warn(chip->dev, "No IRQ configured\n"); | |
338 | } | |
339 | ||
340 | ret = da9211_regulator_init(chip); | |
341 | ||
342 | if (ret < 0) | |
343 | dev_err(&i2c->dev, "Failed to initialize regulator: %d\n", ret); | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
1028a37d JB |
348 | static const struct i2c_device_id da9211_i2c_id[] = { |
349 | {"da9211", 0}, | |
350 | {}, | |
351 | }; | |
352 | ||
353 | MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); | |
354 | ||
355 | static struct i2c_driver da9211_regulator_driver = { | |
356 | .driver = { | |
357 | .name = "da9211", | |
358 | .owner = THIS_MODULE, | |
359 | }, | |
360 | .probe = da9211_i2c_probe, | |
1028a37d JB |
361 | .id_table = da9211_i2c_id, |
362 | }; | |
363 | ||
364 | module_i2c_driver(da9211_regulator_driver); | |
365 | ||
366 | MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); | |
367 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211"); | |
368 | MODULE_LICENSE("GPL v2"); |