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 */
32enum {
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
54struct pv88060_regulator {
55 struct regulator_desc desc;
56 unsigned int conf; /* buck configuration register */
57};
58
59struct pv88060 {
60 struct device *dev;
61 struct regmap *regmap;
62 struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
63};
64
65static const struct regmap_config pv88060_regmap_config = {
66 .reg_bits = 8,
67 .val_bits = 8,
68};
69
70/* Current limits array (in uA) for BUCK1
71 * Entry indexes corresponds to register values.
72 */
73
74static const unsigned int pv88060_buck1_limits[] = {
75 1496000, 2393000, 3291000, 4189000
76};
77
78static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
79{
80 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
81 unsigned int data;
82 int ret, mode = 0;
83
84 ret = regmap_read(rdev->regmap, info->conf, &data);
85 if (ret < 0)
86 return ret;
87
88 switch (data & PV88060_BUCK_MODE_MASK) {
89 case PV88060_BUCK_MODE_SYNC:
90 mode = REGULATOR_MODE_FAST;
91 break;
92 case PV88060_BUCK_MODE_AUTO:
93 mode = REGULATOR_MODE_NORMAL;
94 break;
95 case PV88060_BUCK_MODE_SLEEP:
96 mode = REGULATOR_MODE_STANDBY;
97 break;
98 }
99
100 return mode;
101}
102
103static int pv88060_buck_set_mode(struct regulator_dev *rdev,
104 unsigned int mode)
105{
106 struct pv88060_regulator *info = rdev_get_drvdata(rdev);
107 int val = 0;
108
109 switch (mode) {
110 case REGULATOR_MODE_FAST:
111 val = PV88060_BUCK_MODE_SYNC;
112 break;
113 case REGULATOR_MODE_NORMAL:
114 val = PV88060_BUCK_MODE_AUTO;
115 break;
116 case REGULATOR_MODE_STANDBY:
117 val = PV88060_BUCK_MODE_SLEEP;
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 return regmap_update_bits(rdev->regmap, info->conf,
124 PV88060_BUCK_MODE_MASK, val);
125}
126
127static const struct regulator_ops pv88060_buck_ops = {
128 .get_mode = pv88060_buck_get_mode,
129 .set_mode = pv88060_buck_set_mode,
130 .enable = regulator_enable_regmap,
131 .disable = regulator_disable_regmap,
132 .is_enabled = regulator_is_enabled_regmap,
133 .set_voltage_sel = regulator_set_voltage_sel_regmap,
134 .get_voltage_sel = regulator_get_voltage_sel_regmap,
135 .list_voltage = regulator_list_voltage_linear,
136 .set_current_limit = regulator_set_current_limit_regmap,
137 .get_current_limit = regulator_get_current_limit_regmap,
138};
139
140static const struct regulator_ops pv88060_ldo_ops = {
141 .enable = regulator_enable_regmap,
142 .disable = regulator_disable_regmap,
143 .is_enabled = regulator_is_enabled_regmap,
144 .set_voltage_sel = regulator_set_voltage_sel_regmap,
145 .get_voltage_sel = regulator_get_voltage_sel_regmap,
146 .list_voltage = regulator_list_voltage_linear,
147};
148
149static const struct regulator_ops pv88060_sw_ops = {
150 .enable = regulator_enable_regmap,
151 .disable = regulator_disable_regmap,
152 .is_enabled = regulator_is_enabled_regmap,
153};
154
155#define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
156{\
157 .desc = {\
158 .id = chip##_ID_##regl_name,\
159 .name = __stringify(chip##_##regl_name),\
160 .of_match = of_match_ptr(#regl_name),\
161 .regulators_node = of_match_ptr("regulators"),\
162 .type = REGULATOR_VOLTAGE,\
163 .owner = THIS_MODULE,\
164 .ops = &pv88060_buck_ops,\
165 .min_uV = min,\
166 .uV_step = step,\
167 .n_voltages = ((max) - (min))/(step) + 1,\
168 .enable_reg = PV88060_REG_##regl_name##_CONF0,\
169 .enable_mask = PV88060_BUCK_EN, \
170 .vsel_reg = PV88060_REG_##regl_name##_CONF0,\
171 .vsel_mask = PV88060_VBUCK_MASK,\
172 .curr_table = limits_array,\
173 .n_current_limits = ARRAY_SIZE(limits_array),\
174 .csel_reg = PV88060_REG_##regl_name##_CONF1,\
175 .csel_mask = PV88060_BUCK_ILIM_MASK,\
176 },\
177 .conf = PV88060_REG_##regl_name##_CONF1,\
178}
179
180#define PV88060_LDO(chip, regl_name, min, step, max) \
181{\
182 .desc = {\
183 .id = chip##_ID_##regl_name,\
184 .name = __stringify(chip##_##regl_name),\
185 .of_match = of_match_ptr(#regl_name),\
186 .regulators_node = of_match_ptr("regulators"),\
187 .type = REGULATOR_VOLTAGE,\
188 .owner = THIS_MODULE,\
189 .ops = &pv88060_ldo_ops,\
190 .min_uV = min, \
191 .uV_step = step, \
192 .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
193 .enable_reg = PV88060_REG_##regl_name##_CONF, \
194 .enable_mask = PV88060_LDO_EN, \
195 .vsel_reg = PV88060_REG_##regl_name##_CONF, \
196 .vsel_mask = PV88060_VLDO_MASK, \
197 },\
198}
199
200#define PV88060_SW(chip, regl_name, max) \
201{\
202 .desc = {\
203 .id = chip##_ID_##regl_name,\
204 .name = __stringify(chip##_##regl_name),\
205 .of_match = of_match_ptr(#regl_name),\
206 .regulators_node = of_match_ptr("regulators"),\
207 .type = REGULATOR_VOLTAGE,\
208 .owner = THIS_MODULE,\
209 .ops = &pv88060_sw_ops,\
210 .fixed_uV = max,\
211 .n_voltages = 1,\
212 .enable_reg = PV88060_REG_##regl_name##_CONF,\
213 .enable_mask = PV88060_SW_EN,\
214 },\
215}
216
217static const struct pv88060_regulator pv88060_regulator_info[] = {
218 PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
219 pv88060_buck1_limits),
220 PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
221 PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
222 PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
223 PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
224 PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
225 PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
226 PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
227 PV88060_SW(PV88060, SW1, 5000000),
228 PV88060_SW(PV88060, SW2, 5000000),
229 PV88060_SW(PV88060, SW3, 5000000),
230 PV88060_SW(PV88060, SW4, 5000000),
231 PV88060_SW(PV88060, SW5, 5000000),
232 PV88060_SW(PV88060, SW6, 5000000),
233};
234
235static irqreturn_t pv88060_irq_handler(int irq, void *data)
236{
237 struct pv88060 *chip = data;
238 int i, reg_val, err, ret = IRQ_NONE;
239
240 err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
241 if (err < 0)
242 goto error_i2c;
243
244 if (reg_val & PV88060_E_VDD_FLT) {
245 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
246 if (chip->rdev[i] != NULL) {
247 regulator_notifier_call_chain(chip->rdev[i],
248 REGULATOR_EVENT_UNDER_VOLTAGE,
249 NULL);
250 }
251 }
252
253 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
254 PV88060_E_VDD_FLT);
255 if (err < 0)
256 goto error_i2c;
257
258 ret = IRQ_HANDLED;
259 }
260
261 if (reg_val & PV88060_E_OVER_TEMP) {
262 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
263 if (chip->rdev[i] != NULL) {
264 regulator_notifier_call_chain(chip->rdev[i],
265 REGULATOR_EVENT_OVER_TEMP,
266 NULL);
267 }
268 }
269
270 err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
271 PV88060_E_OVER_TEMP);
272 if (err < 0)
273 goto error_i2c;
274
275 ret = IRQ_HANDLED;
276 }
277
278 return ret;
279
280error_i2c:
281 dev_err(chip->dev, "I2C error : %d\n", err);
282 return IRQ_NONE;
283}
284
285/*
286 * I2C driver interface functions
287 */
288static int pv88060_i2c_probe(struct i2c_client *i2c,
289 const struct i2c_device_id *id)
290{
291 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
292 struct pv88060 *chip;
293 struct regulator_config config = { };
294 int error, i, ret = 0;
295
296 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
297 if (!chip)
298 return -ENOMEM;
299
300 chip->dev = &i2c->dev;
301 chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
302 if (IS_ERR(chip->regmap)) {
303 error = PTR_ERR(chip->regmap);
304 dev_err(chip->dev, "Failed to allocate register map: %d\n",
305 error);
306 return error;
307 }
308
309 i2c_set_clientdata(i2c, chip);
310
311 if (i2c->irq != 0) {
312 ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
313 if (ret < 0) {
314 dev_err(chip->dev,
315 "Failed to mask A reg: %d\n", ret);
316 return ret;
317 }
318
319 ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
320 if (ret < 0) {
321 dev_err(chip->dev,
322 "Failed to mask B reg: %d\n", ret);
323 return ret;
324 }
325
326 ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
327 if (ret < 0) {
328 dev_err(chip->dev,
329 "Failed to mask C reg: %d\n", ret);
330 return ret;
331 }
332
333 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
334 pv88060_irq_handler,
335 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
336 "pv88060", chip);
337 if (ret != 0) {
338 dev_err(chip->dev, "Failed to request IRQ: %d\n",
339 i2c->irq);
340 return ret;
341 }
342
343 ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
344 PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
345 if (ret < 0) {
346 dev_err(chip->dev,
347 "Failed to update mask reg: %d\n", ret);
348 return ret;
349 }
350
351 } else {
352 dev_warn(chip->dev, "No IRQ configured\n");
353 }
354
355 config.dev = chip->dev;
356 config.regmap = chip->regmap;
357
358 for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
359 if (init_data)
360 config.init_data = &init_data[i];
361
362 config.driver_data = (void *)&pv88060_regulator_info[i];
363 chip->rdev[i] = devm_regulator_register(chip->dev,
364 &pv88060_regulator_info[i].desc, &config);
365 if (IS_ERR(chip->rdev[i])) {
366 dev_err(chip->dev,
367 "Failed to register PV88060 regulator\n");
368 return PTR_ERR(chip->rdev[i]);
369 }
370 }
371
372 return 0;
373}
374
375static const struct i2c_device_id pv88060_i2c_id[] = {
376 {"pv88060", 0},
377 {},
378};
379MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
380
381#ifdef CONFIG_OF
382static const struct of_device_id pv88060_dt_ids[] = {
383 { .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
384 {},
385};
386MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
387#endif
388
389static struct i2c_driver pv88060_regulator_driver = {
390 .driver = {
391 .name = "pv88060",
392 .of_match_table = of_match_ptr(pv88060_dt_ids),
393 },
394 .probe = pv88060_i2c_probe,
395 .id_table = pv88060_i2c_id,
396};
397
398module_i2c_driver(pv88060_regulator_driver);
399
400MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
401MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
402MODULE_LICENSE("GPL");
403