1 /*
2 * pv88060-regulator.c - Regulator device driver for PV88060
3 * Copyright (C) 2015 Powerventure Semiconductor Ltd.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program 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
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23 #include <linux/regmap.h>
24 #include <linux/irq.h>
25 #include <linux/interrupt.h>
26 #include <linux/regulator/of_regulator.h>
27 #include "pv88060-regulator.h"
28
29 #define PV88060_MAX_REGULATORS 14
30
31 /* PV88060 REGULATOR IDs */
32 enum {
33 /* BUCKs */
34 PV88060_ID_BUCK1,
35
36 /* LDOs */
37 PV88060_ID_LDO1,
38 PV88060_ID_LDO2,
39 PV88060_ID_LDO3,
40 PV88060_ID_LDO4,
41 PV88060_ID_LDO5,
42 PV88060_ID_LDO6,
43 PV88060_ID_LDO7,
44
45 /* SWTs */
46 PV88060_ID_SW1,
47 PV88060_ID_SW2,
48 PV88060_ID_SW3,
49 PV88060_ID_SW4,
50 PV88060_ID_SW5,
51 PV88060_ID_SW6,
52 };
53
54 struct pv88060_regulator {
55 struct regulator_desc desc;
56 /* Current limiting */
57 unsigned n_current_limits;
58 const int *current_limits;
59 unsigned int limit_mask;
60 unsigned int conf; /* buck configuration register */
61 };
62
63 struct pv88060 {
64 struct device *dev;
65 struct regmap *regmap;
66 struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
67 };
68
69 static const struct regmap_config pv88060_regmap_config = {
70 .reg_bits = 8,
71 .val_bits = 8,
72 };
73
74 /* Current limits array (in uA) for BUCK1
75 * Entry indexes corresponds to register values.
76 */
77
78 static const int pv88060_buck1_limits[] = {
79 1496000, 2393000, 3291000, 4189000
80 };
81
pv88060_buck_get_mode(struct regulator_dev * rdev)82 static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
83 {
84 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
85 unsigned int data;
86 int ret, mode = 0;
87
88 ret = regmap_read(rdev->regmap, info->conf, &data);
89 if (ret < 0)
90 return ret;
91
92 switch (data & PV88060_BUCK_MODE_MASK) {
93 case PV88060_BUCK_MODE_SYNC:
94 mode = REGULATOR_MODE_FAST;
95 break;
96 case PV88060_BUCK_MODE_AUTO:
97 mode = REGULATOR_MODE_NORMAL;
98 break;
99 case PV88060_BUCK_MODE_SLEEP:
100 mode = REGULATOR_MODE_STANDBY;
101 break;
102 }
103
104 return mode;
105 }
106
pv88060_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)107 static int pv88060_buck_set_mode(struct regulator_dev *rdev,
108 unsigned int mode)
109 {
110 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
111 int val = 0;
112
113 switch (mode) {
114 case REGULATOR_MODE_FAST:
115 val = PV88060_BUCK_MODE_SYNC;
116 break;
117 case REGULATOR_MODE_NORMAL:
118 val = PV88060_BUCK_MODE_AUTO;
119 break;
120 case REGULATOR_MODE_STANDBY:
121 val = PV88060_BUCK_MODE_SLEEP;
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 return regmap_update_bits(rdev->regmap, info->conf,
128 PV88060_BUCK_MODE_MASK, val);
129 }
130
pv88060_set_current_limit(struct regulator_dev * rdev,int min,int max)131 static int pv88060_set_current_limit(struct regulator_dev *rdev, int min,
132 int max)
133 {
134 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
135 int i;
136
137 /* search for closest to maximum */
138 for (i = info->n_current_limits - 1; i >= 0; i--) {
139 if (min <= info->current_limits[i]
140 && max >= info->current_limits[i]) {
141 return regmap_update_bits(rdev->regmap,
142 info->conf,
143 info->limit_mask,
144 i << PV88060_BUCK_ILIM_SHIFT);
145 }
146 }
147
148 return -EINVAL;
149 }
150
pv88060_get_current_limit(struct regulator_dev * rdev)151 static int pv88060_get_current_limit(struct regulator_dev *rdev)
152 {
153 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
154 unsigned int data;
155 int ret;
156
157 ret = regmap_read(rdev->regmap, info->conf, &data);
158 if (ret < 0)
159 return ret;
160
161 data = (data & info->limit_mask) >> PV88060_BUCK_ILIM_SHIFT;
162 return info->current_limits[data];
163 }
164
165 static const struct regulator_ops pv88060_buck_ops = {
166 .get_mode = pv88060_buck_get_mode,
167 .set_mode = pv88060_buck_set_mode,
168 .enable = regulator_enable_regmap,
169 .disable = regulator_disable_regmap,
170 .is_enabled = regulator_is_enabled_regmap,
171 .set_voltage_sel = regulator_set_voltage_sel_regmap,
172 .get_voltage_sel = regulator_get_voltage_sel_regmap,
173 .list_voltage = regulator_list_voltage_linear,
174 .set_current_limit = pv88060_set_current_limit,
175 .get_current_limit = pv88060_get_current_limit,
176 };
177
178 static const struct regulator_ops pv88060_ldo_ops = {
179 .enable = regulator_enable_regmap,
180 .disable = regulator_disable_regmap,
181 .is_enabled = regulator_is_enabled_regmap,
182 .set_voltage_sel = regulator_set_voltage_sel_regmap,
183 .get_voltage_sel = regulator_get_voltage_sel_regmap,
184 .list_voltage = regulator_list_voltage_linear,
185 };
186
187 #define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
188 {\
189 .desc = {\
190 .id = chip##_ID_##regl_name,\
191 .name = __stringify(chip##_##regl_name),\
192 .of_match = of_match_ptr(#regl_name),\
193 .regulators_node = of_match_ptr("regulators"),\
194 .type = REGULATOR_VOLTAGE,\
195 .owner = THIS_MODULE,\
196 .ops = &pv88060_buck_ops,\
197 .min_uV = min,\
198 .uV_step = step,\
199 .n_voltages = ((max) - (min))/(step) + 1,\
200 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
201 .enable_mask = PV88060_BUCK_EN, \
202 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
203 .vsel_mask = PV88060_VBUCK_MASK,\
204 },\
205 .current_limits = limits_array,\
206 .n_current_limits = ARRAY_SIZE(limits_array),\
207 .limit_mask = PV88060_BUCK_ILIM_MASK, \
208 .conf = PV88060_REG_##regl_name##_CONF1,\
209 }
210
211 #define PV88060_LDO(chip, regl_name, min, step, max) \
212 {\
213 .desc = {\
214 .id = chip##_ID_##regl_name,\
215 .name = __stringify(chip##_##regl_name),\
216 .of_match = of_match_ptr(#regl_name),\
217 .regulators_node = of_match_ptr("regulators"),\
218 .type = REGULATOR_VOLTAGE,\
219 .owner = THIS_MODULE,\
220 .ops = &pv88060_ldo_ops,\
221 .min_uV = min, \
222 .uV_step = step, \
223 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
224 .enable_reg = PV88060_REG_##regl_name##_CONF, \
225 .enable_mask = PV88060_LDO_EN, \
226 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
227 .vsel_mask = PV88060_VLDO_MASK, \
228 },\
229 }
230
231 #define PV88060_SW(chip, regl_name, max) \
232 {\
233 .desc = {\
234 .id = chip##_ID_##regl_name,\
235 .name = __stringify(chip##_##regl_name),\
236 .of_match = of_match_ptr(#regl_name),\
237 .regulators_node = of_match_ptr("regulators"),\
238 .type = REGULATOR_VOLTAGE,\
239 .owner = THIS_MODULE,\
240 .ops = &pv88060_ldo_ops,\
241 .min_uV = max,\
242 .uV_step = 0,\
243 .n_voltages = 1,\
244 .enable_reg = PV88060_REG_##regl_name##_CONF,\
245 .enable_mask = PV88060_SW_EN,\
246 },\
247 }
248
249 static const struct pv88060_regulator pv88060_regulator_info[] = {
250 PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
251 pv88060_buck1_limits),
252 PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
253 PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
254 PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
255 PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
256 PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
257 PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
258 PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
259 PV88060_SW(PV88060, SW1, 5000000),
260 PV88060_SW(PV88060, SW2, 5000000),
261 PV88060_SW(PV88060, SW3, 5000000),
262 PV88060_SW(PV88060, SW4, 5000000),
263 PV88060_SW(PV88060, SW5, 5000000),
264 PV88060_SW(PV88060, SW6, 5000000),
265 };
266
pv88060_irq_handler(int irq,void * data)267 static irqreturn_t pv88060_irq_handler(int irq, void *data)
268 {
269 struct pv88060 *chip = data;
270 int i, reg_val, err, ret = IRQ_NONE;
271
272 err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, ®_val);
273 if (err < 0)
274 goto error_i2c;
275
276 if (reg_val & PV88060_E_VDD_FLT) {
277 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
278 if (chip->rdev[i] != NULL) {
279 regulator_notifier_call_chain(chip->rdev[i],
280 REGULATOR_EVENT_UNDER_VOLTAGE,
281 NULL);
282 }
283 }
284
285 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
286 PV88060_E_VDD_FLT);
287 if (err < 0)
288 goto error_i2c;
289
290 ret = IRQ_HANDLED;
291 }
292
293 if (reg_val & PV88060_E_OVER_TEMP) {
294 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
295 if (chip->rdev[i] != NULL) {
296 regulator_notifier_call_chain(chip->rdev[i],
297 REGULATOR_EVENT_OVER_TEMP,
298 NULL);
299 }
300 }
301
302 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
303 PV88060_E_OVER_TEMP);
304 if (err < 0)
305 goto error_i2c;
306
307 ret = IRQ_HANDLED;
308 }
309
310 return ret;
311
312 error_i2c:
313 dev_err(chip->dev, "I2C error : %d\n", err);
314 return IRQ_NONE;
315 }
316
317 /*
318 * I2C driver interface functions
319 */
pv88060_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)320 static int pv88060_i2c_probe(struct i2c_client *i2c,
321 const struct i2c_device_id *id)
322 {
323 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
324 struct pv88060 *chip;
325 struct regulator_config config = { };
326 int error, i, ret = 0;
327
328 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
329 if (!chip)
330 return -ENOMEM;
331
332 chip->dev = &i2c->dev;
333 chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
334 if (IS_ERR(chip->regmap)) {
335 error = PTR_ERR(chip->regmap);
336 dev_err(chip->dev, "Failed to allocate register map: %d\n",
337 error);
338 return error;
339 }
340
341 i2c_set_clientdata(i2c, chip);
342
343 if (i2c->irq != 0) {
344 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
345 if (ret < 0) {
346 dev_err(chip->dev,
347 "Failed to mask A reg: %d\n", ret);
348 return ret;
349 }
350
351 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
352 if (ret < 0) {
353 dev_err(chip->dev,
354 "Failed to mask B reg: %d\n", ret);
355 return ret;
356 }
357
358 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
359 if (ret < 0) {
360 dev_err(chip->dev,
361 "Failed to mask C reg: %d\n", ret);
362 return ret;
363 }
364
365 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
366 pv88060_irq_handler,
367 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
368 "pv88060", chip);
369 if (ret != 0) {
370 dev_err(chip->dev, "Failed to request IRQ: %d\n",
371 i2c->irq);
372 return ret;
373 }
374
375 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
376 PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
377 if (ret < 0) {
378 dev_err(chip->dev,
379 "Failed to update mask reg: %d\n", ret);
380 return ret;
381 }
382
383 } else {
384 dev_warn(chip->dev, "No IRQ configured\n");
385 }
386
387 config.dev = chip->dev;
388 config.regmap = chip->regmap;
389
390 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
391 if (init_data)
392 config.init_data = &init_data[i];
393
394 config.driver_data = (void *)&pv88060_regulator_info[i];
395 chip->rdev[i] = devm_regulator_register(chip->dev,
396 &pv88060_regulator_info[i].desc, &config);
397 if (IS_ERR(chip->rdev[i])) {
398 dev_err(chip->dev,
399 "Failed to register PV88060 regulator\n");
400 return PTR_ERR(chip->rdev[i]);
401 }
402 }
403
404 return 0;
405 }
406
407 static const struct i2c_device_id pv88060_i2c_id[] = {
408 {"pv88060", 0},
409 {},
410 };
411 MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
412
413 #ifdef CONFIG_OF
414 static const struct of_device_id pv88060_dt_ids[] = {
415 { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
416 {},
417 };
418 MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
419 #endif
420
421 static struct i2c_driver pv88060_regulator_driver = {
422 .driver = {
423 .name = "pv88060",
424 .of_match_table = of_match_ptr(pv88060_dt_ids),
425 },
426 .probe = pv88060_i2c_probe,
427 .id_table = pv88060_i2c_id,
428 };
429
430 module_i2c_driver(pv88060_regulator_driver);
431
432 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
433 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
434 MODULE_LICENSE("GPL");
435