1/*
2 * pv88090-regulator.c - Regulator device driver for PV88090
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 "pv88090-regulator.h"
28
29#define PV88090_MAX_REGULATORS 5
30
31/* PV88090 REGULATOR IDs */
32enum {
33 /* BUCKs */
34 PV88090_ID_BUCK1,
35 PV88090_ID_BUCK2,
36 PV88090_ID_BUCK3,
37
38 /* LDOs */
39 PV88090_ID_LDO1,
40 PV88090_ID_LDO2,
41};
42
43struct pv88090_regulator {
44 struct regulator_desc desc;
45 unsigned int conf;
46 unsigned int conf2;
47};
48
49struct pv88090 {
50 struct device *dev;
51 struct regmap *regmap;
52 struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
53};
54
55struct pv88090_buck_voltage {
56 int min_uV;
57 int max_uV;
58 int uV_step;
59};
60
61static const struct regmap_config pv88090_regmap_config = {
62 .reg_bits = 8,
63 .val_bits = 8,
64};
65
66/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
67 * Entry indexes corresponds to register values.
68 */
69
70static const unsigned int pv88090_buck1_limits[] = {
71 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
72 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
73 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
74 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
75};
76
77static const unsigned int pv88090_buck23_limits[] = {
78 1496000, 2393000, 3291000, 4189000
79};
80
81static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
82 {
83 .min_uV = 600000,
84 .max_uV = 1393750,
85 .uV_step = 6250,
86 },
87
88 {
89 .min_uV = 1400000,
90 .max_uV = 2193750,
91 .uV_step = 6250,
92 },
93 {
94 .min_uV = 1250000,
95 .max_uV = 2837500,
96 .uV_step = 12500,
97 },
98};
99
100static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
101{
102 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
103 unsigned int data;
104 int ret, mode = 0;
105
106 ret = regmap_read(rdev->regmap, info->conf, &data);
107 if (ret < 0)
108 return ret;
109
110 switch (data & PV88090_BUCK1_MODE_MASK) {
111 case PV88090_BUCK_MODE_SYNC:
112 mode = REGULATOR_MODE_FAST;
113 break;
114 case PV88090_BUCK_MODE_AUTO:
115 mode = REGULATOR_MODE_NORMAL;
116 break;
117 case PV88090_BUCK_MODE_SLEEP:
118 mode = REGULATOR_MODE_STANDBY;
119 break;
120 }
121
122 return mode;
123}
124
125static int pv88090_buck_set_mode(struct regulator_dev *rdev,
126 unsigned int mode)
127{
128 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
129 int val = 0;
130
131 switch (mode) {
132 case REGULATOR_MODE_FAST:
133 val = PV88090_BUCK_MODE_SYNC;
134 break;
135 case REGULATOR_MODE_NORMAL:
136 val = PV88090_BUCK_MODE_AUTO;
137 break;
138 case REGULATOR_MODE_STANDBY:
139 val = PV88090_BUCK_MODE_SLEEP;
140 break;
141 default:
142 return -EINVAL;
143 }
144
145 return regmap_update_bits(rdev->regmap, info->conf,
146 PV88090_BUCK1_MODE_MASK, val);
147}
148
149static const struct regulator_ops pv88090_buck_ops = {
150 .get_mode = pv88090_buck_get_mode,
151 .set_mode = pv88090_buck_set_mode,
152 .enable = regulator_enable_regmap,
153 .disable = regulator_disable_regmap,
154 .is_enabled = regulator_is_enabled_regmap,
155 .set_voltage_sel = regulator_set_voltage_sel_regmap,
156 .get_voltage_sel = regulator_get_voltage_sel_regmap,
157 .list_voltage = regulator_list_voltage_linear,
158 .set_current_limit = regulator_set_current_limit_regmap,
159 .get_current_limit = regulator_get_current_limit_regmap,
160};
161
162static const struct regulator_ops pv88090_ldo_ops = {
163 .enable = regulator_enable_regmap,
164 .disable = regulator_disable_regmap,
165 .is_enabled = regulator_is_enabled_regmap,
166 .set_voltage_sel = regulator_set_voltage_sel_regmap,
167 .get_voltage_sel = regulator_get_voltage_sel_regmap,
168 .list_voltage = regulator_list_voltage_linear,
169};
170
171#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
172{\
173 .desc = {\
174 .id = chip##_ID_##regl_name,\
175 .name = __stringify(chip##_##regl_name),\
176 .of_match = of_match_ptr(#regl_name),\
177 .regulators_node = of_match_ptr("regulators"),\
178 .type = REGULATOR_VOLTAGE,\
179 .owner = THIS_MODULE,\
180 .ops = &pv88090_buck_ops,\
181 .min_uV = min, \
182 .uV_step = step, \
183 .n_voltages = ((max) - (min))/(step) + 1, \
184 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
185 .enable_mask = PV88090_##regl_name##_EN, \
186 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
187 .vsel_mask = PV88090_V##regl_name##_MASK, \
188 .curr_table = limits_array, \
189 .n_current_limits = ARRAY_SIZE(limits_array), \
190 .csel_reg = PV88090_REG_##regl_name##_CONF1, \
191 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \
192 },\
193 .conf = PV88090_REG_##regl_name##_CONF1, \
194 .conf2 = PV88090_REG_##regl_name##_CONF2, \
195}
196
197#define PV88090_LDO(chip, regl_name, min, step, max) \
198{\
199 .desc = {\
200 .id = chip##_ID_##regl_name,\
201 .name = __stringify(chip##_##regl_name),\
202 .of_match = of_match_ptr(#regl_name),\
203 .regulators_node = of_match_ptr("regulators"),\
204 .type = REGULATOR_VOLTAGE,\
205 .owner = THIS_MODULE,\
206 .ops = &pv88090_ldo_ops,\
207 .min_uV = min, \
208 .uV_step = step, \
209 .n_voltages = ((max) - (min))/(step) + 1, \
210 .enable_reg = PV88090_REG_##regl_name##_CONT, \
211 .enable_mask = PV88090_##regl_name##_EN, \
212 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
213 .vsel_mask = PV88090_V##regl_name##_MASK, \
214 },\
215}
216
217static struct pv88090_regulator pv88090_regulator_info[] = {
218 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
219 pv88090_buck1_limits),
220 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
221 pv88090_buck23_limits),
222 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
223 pv88090_buck23_limits),
224 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
225 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
226};
227
228static irqreturn_t pv88090_irq_handler(int irq, void *data)
229{
230 struct pv88090 *chip = data;
231 int i, reg_val, err, ret = IRQ_NONE;
232
233 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
234 if (err < 0)
235 goto error_i2c;
236
237 if (reg_val & PV88090_E_VDD_FLT) {
238 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
239 if (chip->rdev[i] != NULL) {
240 regulator_notifier_call_chain(chip->rdev[i],
241 REGULATOR_EVENT_UNDER_VOLTAGE,
242 NULL);
243 }
244 }
245
246 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
247 PV88090_E_VDD_FLT);
248 if (err < 0)
249 goto error_i2c;
250
251 ret = IRQ_HANDLED;
252 }
253
254 if (reg_val & PV88090_E_OVER_TEMP) {
255 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
256 if (chip->rdev[i] != NULL) {
257 regulator_notifier_call_chain(chip->rdev[i],
258 REGULATOR_EVENT_OVER_TEMP,
259 NULL);
260 }
261 }
262
263 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
264 PV88090_E_OVER_TEMP);
265 if (err < 0)
266 goto error_i2c;
267
268 ret = IRQ_HANDLED;
269 }
270
271 return ret;
272
273error_i2c:
274 dev_err(chip->dev, "I2C error : %d\n", err);
275 return IRQ_NONE;
276}
277
278/*
279 * I2C driver interface functions
280 */
281static int pv88090_i2c_probe(struct i2c_client *i2c,
282 const struct i2c_device_id *id)
283{
284 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
285 struct pv88090 *chip;
286 struct regulator_config config = { };
287 int error, i, ret = 0;
288 unsigned int conf2, range, index;
289
290 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
291 if (!chip)
292 return -ENOMEM;
293
294 chip->dev = &i2c->dev;
295 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
296 if (IS_ERR(chip->regmap)) {
297 error = PTR_ERR(chip->regmap);
298 dev_err(chip->dev, "Failed to allocate register map: %d\n",
299 error);
300 return error;
301 }
302
303 i2c_set_clientdata(i2c, chip);
304
305 if (i2c->irq != 0) {
306 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
307 if (ret < 0) {
308 dev_err(chip->dev,
309 "Failed to mask A reg: %d\n", ret);
310 return ret;
311 }
312
313 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
314 if (ret < 0) {
315 dev_err(chip->dev,
316 "Failed to mask B reg: %d\n", ret);
317 return ret;
318 }
319
320 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
321 pv88090_irq_handler,
322 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
323 "pv88090", chip);
324 if (ret != 0) {
325 dev_err(chip->dev, "Failed to request IRQ: %d\n",
326 i2c->irq);
327 return ret;
328 }
329
330 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
331 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
332 if (ret < 0) {
333 dev_err(chip->dev,
334 "Failed to update mask reg: %d\n", ret);
335 return ret;
336 }
337
338 } else {
339 dev_warn(chip->dev, "No IRQ configured\n");
340 }
341
342 config.dev = chip->dev;
343 config.regmap = chip->regmap;
344
345 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
346 if (init_data)
347 config.init_data = &init_data[i];
348
349 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
350 ret = regmap_read(chip->regmap,
351 pv88090_regulator_info[i].conf2, &conf2);
352 if (ret < 0)
353 return ret;
354
355 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
356 PV88090_BUCK_VDAC_RANGE_MASK;
357
358 ret = regmap_read(chip->regmap,
359 PV88090_REG_BUCK_FOLD_RANGE, &range);
360 if (ret < 0)
361 return ret;
362
363 range = (range >>
364 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
365 PV88090_BUCK_VRANGE_GAIN_MASK;
366 index = ((range << 1) | conf2);
367 if (index > PV88090_ID_BUCK3) {
368 dev_err(chip->dev,
369 "Invalid index(%d)\n", index);
370 return -EINVAL;
371 }
372
373 pv88090_regulator_info[i].desc.min_uV
374 = pv88090_buck_vol[index].min_uV;
375 pv88090_regulator_info[i].desc.uV_step
376 = pv88090_buck_vol[index].uV_step;
377 pv88090_regulator_info[i].desc.n_voltages
378 = ((pv88090_buck_vol[index].max_uV)
379 - (pv88090_buck_vol[index].min_uV))
380 /(pv88090_buck_vol[index].uV_step) + 1;
381 }
382
383 config.driver_data = (void *)&pv88090_regulator_info[i];
384 chip->rdev[i] = devm_regulator_register(chip->dev,
385 &pv88090_regulator_info[i].desc, &config);
386 if (IS_ERR(chip->rdev[i])) {
387 dev_err(chip->dev,
388 "Failed to register PV88090 regulator\n");
389 return PTR_ERR(chip->rdev[i]);
390 }
391 }
392
393 return 0;
394}
395
396static const struct i2c_device_id pv88090_i2c_id[] = {
397 {"pv88090", 0},
398 {},
399};
400MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
401
402#ifdef CONFIG_OF
403static const struct of_device_id pv88090_dt_ids[] = {
404 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
405 {},
406};
407MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
408#endif
409
410static struct i2c_driver pv88090_regulator_driver = {
411 .driver = {
412 .name = "pv88090",
413 .of_match_table = of_match_ptr(pv88090_dt_ids),
414 },
415 .probe = pv88090_i2c_probe,
416 .id_table = pv88090_i2c_id,
417};
418
419module_i2c_driver(pv88090_regulator_driver);
420
421MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
422MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
423MODULE_LICENSE("GPL");
424