Linux 3.17-rc7
[sfrench/cifs-2.6.git] / drivers / regulator / da9211-regulator.c
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, &reg_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);
248                 return ret;
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 {
262                 dev_err(chip->dev, "Configuration is mismatched\n");
263                 return -EINVAL;
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");
280                         return PTR_ERR(chip->rdev[i]);
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);
289                                 return ret;
290                         }
291                 }
292         }
293
294         return 0;
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
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,
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");