1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // pv88090-regulator.c - Regulator device driver for PV88090
4 // Copyright (C) 2015 Powerventure Semiconductor Ltd.
5
6 #include <linux/err.h>
7 #include <linux/i2c.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/regulator/driver.h>
12 #include <linux/regulator/machine.h>
13 #include <linux/regmap.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/regulator/of_regulator.h>
17 #include "pv88090-regulator.h"
18
19 #define PV88090_MAX_REGULATORS 5
20
21 /* PV88090 REGULATOR IDs */
22 enum {
23 /* BUCKs */
24 PV88090_ID_BUCK1,
25 PV88090_ID_BUCK2,
26 PV88090_ID_BUCK3,
27
28 /* LDOs */
29 PV88090_ID_LDO1,
30 PV88090_ID_LDO2,
31 };
32
33 struct pv88090_regulator {
34 struct regulator_desc desc;
35 unsigned int conf;
36 unsigned int conf2;
37 };
38
39 struct pv88090 {
40 struct device *dev;
41 struct regmap *regmap;
42 struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
43 };
44
45 struct pv88090_buck_voltage {
46 int min_uV;
47 int max_uV;
48 int uV_step;
49 };
50
51 static const struct regmap_config pv88090_regmap_config = {
52 .reg_bits = 8,
53 .val_bits = 8,
54 };
55
56 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
57 * Entry indexes corresponds to register values.
58 */
59
60 static const unsigned int pv88090_buck1_limits[] = {
61 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
62 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
63 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
64 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
65 };
66
67 static const unsigned int pv88090_buck23_limits[] = {
68 1496000, 2393000, 3291000, 4189000
69 };
70
71 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
72 {
73 .min_uV = 600000,
74 .max_uV = 1393750,
75 .uV_step = 6250,
76 },
77
78 {
79 .min_uV = 1400000,
80 .max_uV = 2193750,
81 .uV_step = 6250,
82 },
83 {
84 .min_uV = 1250000,
85 .max_uV = 2837500,
86 .uV_step = 12500,
87 },
88 };
89
pv88090_buck_get_mode(struct regulator_dev * rdev)90 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
91 {
92 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
93 unsigned int data;
94 int ret, mode = 0;
95
96 ret = regmap_read(rdev->regmap, info->conf, &data);
97 if (ret < 0)
98 return ret;
99
100 switch (data & PV88090_BUCK1_MODE_MASK) {
101 case PV88090_BUCK_MODE_SYNC:
102 mode = REGULATOR_MODE_FAST;
103 break;
104 case PV88090_BUCK_MODE_AUTO:
105 mode = REGULATOR_MODE_NORMAL;
106 break;
107 case PV88090_BUCK_MODE_SLEEP:
108 mode = REGULATOR_MODE_STANDBY;
109 break;
110 }
111
112 return mode;
113 }
114
pv88090_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)115 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
116 unsigned int mode)
117 {
118 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
119 int val = 0;
120
121 switch (mode) {
122 case REGULATOR_MODE_FAST:
123 val = PV88090_BUCK_MODE_SYNC;
124 break;
125 case REGULATOR_MODE_NORMAL:
126 val = PV88090_BUCK_MODE_AUTO;
127 break;
128 case REGULATOR_MODE_STANDBY:
129 val = PV88090_BUCK_MODE_SLEEP;
130 break;
131 default:
132 return -EINVAL;
133 }
134
135 return regmap_update_bits(rdev->regmap, info->conf,
136 PV88090_BUCK1_MODE_MASK, val);
137 }
138
139 static const struct regulator_ops pv88090_buck_ops = {
140 .get_mode = pv88090_buck_get_mode,
141 .set_mode = pv88090_buck_set_mode,
142 .enable = regulator_enable_regmap,
143 .disable = regulator_disable_regmap,
144 .is_enabled = regulator_is_enabled_regmap,
145 .set_voltage_sel = regulator_set_voltage_sel_regmap,
146 .get_voltage_sel = regulator_get_voltage_sel_regmap,
147 .list_voltage = regulator_list_voltage_linear,
148 .set_current_limit = regulator_set_current_limit_regmap,
149 .get_current_limit = regulator_get_current_limit_regmap,
150 };
151
152 static const struct regulator_ops pv88090_ldo_ops = {
153 .enable = regulator_enable_regmap,
154 .disable = regulator_disable_regmap,
155 .is_enabled = regulator_is_enabled_regmap,
156 .set_voltage_sel = regulator_set_voltage_sel_regmap,
157 .get_voltage_sel = regulator_get_voltage_sel_regmap,
158 .list_voltage = regulator_list_voltage_linear,
159 };
160
161 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
162 {\
163 .desc = {\
164 .id = chip##_ID_##regl_name,\
165 .name = __stringify(chip##_##regl_name),\
166 .of_match = of_match_ptr(#regl_name),\
167 .regulators_node = of_match_ptr("regulators"),\
168 .type = REGULATOR_VOLTAGE,\
169 .owner = THIS_MODULE,\
170 .ops = &pv88090_buck_ops,\
171 .min_uV = min, \
172 .uV_step = step, \
173 .n_voltages = ((max) - (min))/(step) + 1, \
174 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
175 .enable_mask = PV88090_##regl_name##_EN, \
176 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
177 .vsel_mask = PV88090_V##regl_name##_MASK, \
178 .curr_table = limits_array, \
179 .n_current_limits = ARRAY_SIZE(limits_array), \
180 .csel_reg = PV88090_REG_##regl_name##_CONF1, \
181 .csel_mask = PV88090_##regl_name##_ILIM_MASK, \
182 },\
183 .conf = PV88090_REG_##regl_name##_CONF1, \
184 .conf2 = PV88090_REG_##regl_name##_CONF2, \
185 }
186
187 #define PV88090_LDO(chip, regl_name, min, step, max) \
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 = &pv88090_ldo_ops,\
197 .min_uV = min, \
198 .uV_step = step, \
199 .n_voltages = ((max) - (min))/(step) + 1, \
200 .enable_reg = PV88090_REG_##regl_name##_CONT, \
201 .enable_mask = PV88090_##regl_name##_EN, \
202 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
203 .vsel_mask = PV88090_V##regl_name##_MASK, \
204 },\
205 }
206
207 static struct pv88090_regulator pv88090_regulator_info[] = {
208 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
209 pv88090_buck1_limits),
210 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
211 pv88090_buck23_limits),
212 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
213 pv88090_buck23_limits),
214 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
215 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
216 };
217
pv88090_irq_handler(int irq,void * data)218 static irqreturn_t pv88090_irq_handler(int irq, void *data)
219 {
220 struct pv88090 *chip = data;
221 int i, reg_val, err, ret = IRQ_NONE;
222
223 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, ®_val);
224 if (err < 0)
225 goto error_i2c;
226
227 if (reg_val & PV88090_E_VDD_FLT) {
228 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
229 if (chip->rdev[i] != NULL)
230 regulator_notifier_call_chain(chip->rdev[i],
231 REGULATOR_EVENT_UNDER_VOLTAGE,
232 NULL);
233 }
234
235 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
236 PV88090_E_VDD_FLT);
237 if (err < 0)
238 goto error_i2c;
239
240 ret = IRQ_HANDLED;
241 }
242
243 if (reg_val & PV88090_E_OVER_TEMP) {
244 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
245 if (chip->rdev[i] != NULL)
246 regulator_notifier_call_chain(chip->rdev[i],
247 REGULATOR_EVENT_OVER_TEMP,
248 NULL);
249 }
250
251 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
252 PV88090_E_OVER_TEMP);
253 if (err < 0)
254 goto error_i2c;
255
256 ret = IRQ_HANDLED;
257 }
258
259 return ret;
260
261 error_i2c:
262 dev_err(chip->dev, "I2C error : %d\n", err);
263 return IRQ_NONE;
264 }
265
266 /*
267 * I2C driver interface functions
268 */
pv88090_i2c_probe(struct i2c_client * i2c)269 static int pv88090_i2c_probe(struct i2c_client *i2c)
270 {
271 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
272 struct pv88090 *chip;
273 struct regulator_config config = { };
274 int error, i, ret = 0;
275 unsigned int conf2, range, index;
276
277 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
278 if (!chip)
279 return -ENOMEM;
280
281 chip->dev = &i2c->dev;
282 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
283 if (IS_ERR(chip->regmap)) {
284 error = PTR_ERR(chip->regmap);
285 dev_err(chip->dev, "Failed to allocate register map: %d\n",
286 error);
287 return error;
288 }
289
290 i2c_set_clientdata(i2c, chip);
291
292 if (i2c->irq != 0) {
293 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
294 if (ret < 0) {
295 dev_err(chip->dev,
296 "Failed to mask A reg: %d\n", ret);
297 return ret;
298 }
299
300 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
301 if (ret < 0) {
302 dev_err(chip->dev,
303 "Failed to mask B reg: %d\n", ret);
304 return ret;
305 }
306
307 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
308 pv88090_irq_handler,
309 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
310 "pv88090", chip);
311 if (ret != 0) {
312 dev_err(chip->dev, "Failed to request IRQ: %d\n",
313 i2c->irq);
314 return ret;
315 }
316
317 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
318 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
319 if (ret < 0) {
320 dev_err(chip->dev,
321 "Failed to update mask reg: %d\n", ret);
322 return ret;
323 }
324
325 } else {
326 dev_warn(chip->dev, "No IRQ configured\n");
327 }
328
329 config.dev = chip->dev;
330 config.regmap = chip->regmap;
331
332 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
333 if (init_data)
334 config.init_data = &init_data[i];
335
336 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
337 ret = regmap_read(chip->regmap,
338 pv88090_regulator_info[i].conf2, &conf2);
339 if (ret < 0)
340 return ret;
341
342 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
343 PV88090_BUCK_VDAC_RANGE_MASK;
344
345 ret = regmap_read(chip->regmap,
346 PV88090_REG_BUCK_FOLD_RANGE, &range);
347 if (ret < 0)
348 return ret;
349
350 range = (range >>
351 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
352 PV88090_BUCK_VRANGE_GAIN_MASK;
353 index = ((range << 1) | conf2);
354 if (index > PV88090_ID_BUCK3) {
355 dev_err(chip->dev,
356 "Invalid index(%d)\n", index);
357 return -EINVAL;
358 }
359
360 pv88090_regulator_info[i].desc.min_uV
361 = pv88090_buck_vol[index].min_uV;
362 pv88090_regulator_info[i].desc.uV_step
363 = pv88090_buck_vol[index].uV_step;
364 pv88090_regulator_info[i].desc.n_voltages
365 = ((pv88090_buck_vol[index].max_uV)
366 - (pv88090_buck_vol[index].min_uV))
367 /(pv88090_buck_vol[index].uV_step) + 1;
368 }
369
370 config.driver_data = (void *)&pv88090_regulator_info[i];
371 chip->rdev[i] = devm_regulator_register(chip->dev,
372 &pv88090_regulator_info[i].desc, &config);
373 if (IS_ERR(chip->rdev[i])) {
374 dev_err(chip->dev,
375 "Failed to register PV88090 regulator\n");
376 return PTR_ERR(chip->rdev[i]);
377 }
378 }
379
380 return 0;
381 }
382
383 static const struct i2c_device_id pv88090_i2c_id[] = {
384 {"pv88090", 0},
385 {},
386 };
387 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
388
389 #ifdef CONFIG_OF
390 static const struct of_device_id pv88090_dt_ids[] = {
391 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
392 {},
393 };
394 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
395 #endif
396
397 static struct i2c_driver pv88090_regulator_driver = {
398 .driver = {
399 .name = "pv88090",
400 .of_match_table = of_match_ptr(pv88090_dt_ids),
401 },
402 .probe_new = pv88090_i2c_probe,
403 .id_table = pv88090_i2c_id,
404 };
405
406 module_i2c_driver(pv88090_regulator_driver);
407
408 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
409 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
410 MODULE_LICENSE("GPL");
411