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99cf3af5 JB |
1 | /* |
2 | * pv88080-regulator.c - Regulator device driver for PV88080 | |
3 | * Copyright (C) 2016 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/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/of_regulator.h> | |
28 | #include <linux/proc_fs.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include "pv88080-regulator.h" | |
31 | ||
32 | #define PV88080_MAX_REGULATORS 3 | |
33 | ||
34 | /* PV88080 REGULATOR IDs */ | |
35 | enum { | |
36 | /* BUCKs */ | |
37 | PV88080_ID_BUCK1, | |
38 | PV88080_ID_BUCK2, | |
39 | PV88080_ID_BUCK3, | |
40 | }; | |
41 | ||
42 | struct pv88080_regulator { | |
43 | struct regulator_desc desc; | |
44 | /* Current limiting */ | |
45 | unsigned int n_current_limits; | |
46 | const int *current_limits; | |
47 | unsigned int limit_mask; | |
48 | unsigned int conf; | |
49 | unsigned int conf2; | |
50 | unsigned int conf5; | |
51 | }; | |
52 | ||
53 | struct pv88080 { | |
54 | struct device *dev; | |
55 | struct regmap *regmap; | |
56 | struct regulator_dev *rdev[PV88080_MAX_REGULATORS]; | |
57 | }; | |
58 | ||
59 | struct pv88080_buck_voltage { | |
60 | int min_uV; | |
61 | int max_uV; | |
62 | int uV_step; | |
63 | }; | |
64 | ||
65 | static const struct regmap_config pv88080_regmap_config = { | |
66 | .reg_bits = 8, | |
67 | .val_bits = 8, | |
68 | }; | |
69 | ||
70 | /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3. | |
71 | * Entry indexes corresponds to register values. | |
72 | */ | |
73 | ||
74 | static const int pv88080_buck1_limits[] = { | |
75 | 3230000, 5130000, 6960000, 8790000 | |
76 | }; | |
77 | ||
78 | static const int pv88080_buck23_limits[] = { | |
79 | 1496000, 2393000, 3291000, 4189000 | |
80 | }; | |
81 | ||
82 | static const struct pv88080_buck_voltage pv88080_buck_vol[2] = { | |
83 | { | |
84 | .min_uV = 600000, | |
85 | .max_uV = 1393750, | |
86 | .uV_step = 6250, | |
87 | }, | |
88 | { | |
89 | .min_uV = 1400000, | |
90 | .max_uV = 2193750, | |
91 | .uV_step = 6250, | |
92 | }, | |
93 | }; | |
94 | ||
95 | static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev) | |
96 | { | |
97 | struct pv88080_regulator *info = rdev_get_drvdata(rdev); | |
98 | unsigned int data; | |
99 | int ret, mode = 0; | |
100 | ||
101 | ret = regmap_read(rdev->regmap, info->conf, &data); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | switch (data & PV88080_BUCK1_MODE_MASK) { | |
106 | case PV88080_BUCK_MODE_SYNC: | |
107 | mode = REGULATOR_MODE_FAST; | |
108 | break; | |
109 | case PV88080_BUCK_MODE_AUTO: | |
110 | mode = REGULATOR_MODE_NORMAL; | |
111 | break; | |
112 | case PV88080_BUCK_MODE_SLEEP: | |
113 | mode = REGULATOR_MODE_STANDBY; | |
114 | break; | |
115 | default: | |
116 | return -EINVAL; | |
117 | } | |
118 | ||
119 | return mode; | |
120 | } | |
121 | ||
122 | static int pv88080_buck_set_mode(struct regulator_dev *rdev, | |
123 | unsigned int mode) | |
124 | { | |
125 | struct pv88080_regulator *info = rdev_get_drvdata(rdev); | |
126 | int val = 0; | |
127 | ||
128 | switch (mode) { | |
129 | case REGULATOR_MODE_FAST: | |
130 | val = PV88080_BUCK_MODE_SYNC; | |
131 | break; | |
132 | case REGULATOR_MODE_NORMAL: | |
133 | val = PV88080_BUCK_MODE_AUTO; | |
134 | break; | |
135 | case REGULATOR_MODE_STANDBY: | |
136 | val = PV88080_BUCK_MODE_SLEEP; | |
137 | break; | |
138 | default: | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | return regmap_update_bits(rdev->regmap, info->conf, | |
143 | PV88080_BUCK1_MODE_MASK, val); | |
144 | } | |
145 | ||
146 | static int pv88080_set_current_limit(struct regulator_dev *rdev, int min, | |
147 | int max) | |
148 | { | |
149 | struct pv88080_regulator *info = rdev_get_drvdata(rdev); | |
150 | int i; | |
151 | ||
152 | /* search for closest to maximum */ | |
153 | for (i = info->n_current_limits; i >= 0; i--) { | |
154 | if (min <= info->current_limits[i] | |
155 | && max >= info->current_limits[i]) { | |
156 | return regmap_update_bits(rdev->regmap, | |
157 | info->conf, | |
158 | info->limit_mask, | |
159 | i << PV88080_BUCK1_ILIM_SHIFT); | |
160 | } | |
161 | } | |
162 | ||
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | static int pv88080_get_current_limit(struct regulator_dev *rdev) | |
167 | { | |
168 | struct pv88080_regulator *info = rdev_get_drvdata(rdev); | |
169 | unsigned int data; | |
170 | int ret; | |
171 | ||
172 | ret = regmap_read(rdev->regmap, info->conf, &data); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | ||
176 | data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT; | |
177 | return info->current_limits[data]; | |
178 | } | |
179 | ||
180 | static struct regulator_ops pv88080_buck_ops = { | |
181 | .get_mode = pv88080_buck_get_mode, | |
182 | .set_mode = pv88080_buck_set_mode, | |
183 | .enable = regulator_enable_regmap, | |
184 | .disable = regulator_disable_regmap, | |
185 | .is_enabled = regulator_is_enabled_regmap, | |
186 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
187 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
188 | .list_voltage = regulator_list_voltage_linear, | |
189 | .set_current_limit = pv88080_set_current_limit, | |
190 | .get_current_limit = pv88080_get_current_limit, | |
191 | }; | |
192 | ||
193 | #define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \ | |
194 | {\ | |
195 | .desc = {\ | |
196 | .id = chip##_ID_##regl_name,\ | |
197 | .name = __stringify(chip##_##regl_name),\ | |
198 | .of_match = of_match_ptr(#regl_name),\ | |
199 | .regulators_node = of_match_ptr("regulators"),\ | |
200 | .type = REGULATOR_VOLTAGE,\ | |
201 | .owner = THIS_MODULE,\ | |
202 | .ops = &pv88080_buck_ops,\ | |
203 | .min_uV = min, \ | |
204 | .uV_step = step, \ | |
205 | .n_voltages = ((max) - (min))/(step) + 1, \ | |
206 | .enable_reg = PV88080_REG_##regl_name##_CONF0, \ | |
207 | .enable_mask = PV88080_##regl_name##_EN, \ | |
208 | .vsel_reg = PV88080_REG_##regl_name##_CONF0, \ | |
209 | .vsel_mask = PV88080_V##regl_name##_MASK, \ | |
210 | },\ | |
211 | .current_limits = limits_array, \ | |
212 | .n_current_limits = ARRAY_SIZE(limits_array), \ | |
213 | .limit_mask = PV88080_##regl_name##_ILIM_MASK, \ | |
214 | .conf = PV88080_REG_##regl_name##_CONF1, \ | |
215 | .conf2 = PV88080_REG_##regl_name##_CONF2, \ | |
216 | .conf5 = PV88080_REG_##regl_name##_CONF5, \ | |
217 | } | |
218 | ||
219 | static struct pv88080_regulator pv88080_regulator_info[] = { | |
220 | PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750, | |
221 | pv88080_buck1_limits), | |
222 | PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750, | |
223 | pv88080_buck23_limits), | |
224 | PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750, | |
225 | pv88080_buck23_limits), | |
226 | }; | |
227 | ||
228 | static irqreturn_t pv88080_irq_handler(int irq, void *data) | |
229 | { | |
230 | struct pv88080 *chip = data; | |
231 | int i, reg_val, err, ret = IRQ_NONE; | |
232 | ||
233 | err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, ®_val); | |
234 | if (err < 0) | |
235 | goto error_i2c; | |
236 | ||
237 | if (reg_val & PV88080_E_VDD_FLT) { | |
238 | for (i = 0; i < PV88080_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, PV88080_REG_EVENT_A, | |
247 | PV88080_E_VDD_FLT); | |
248 | if (err < 0) | |
249 | goto error_i2c; | |
250 | ||
251 | ret = IRQ_HANDLED; | |
252 | } | |
253 | ||
254 | if (reg_val & PV88080_E_OVER_TEMP) { | |
255 | for (i = 0; i < PV88080_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, PV88080_REG_EVENT_A, | |
264 | PV88080_E_OVER_TEMP); | |
265 | if (err < 0) | |
266 | goto error_i2c; | |
267 | ||
268 | ret = IRQ_HANDLED; | |
269 | } | |
270 | ||
271 | return ret; | |
272 | ||
273 | error_i2c: | |
274 | dev_err(chip->dev, "I2C error : %d\n", err); | |
275 | return IRQ_NONE; | |
276 | } | |
277 | ||
278 | /* | |
279 | * I2C driver interface functions | |
280 | */ | |
281 | static int pv88080_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 pv88080 *chip; | |
286 | struct regulator_config config = { }; | |
287 | int i, error, ret; | |
288 | unsigned int conf2, conf5; | |
289 | ||
290 | chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL); | |
291 | if (!chip) | |
292 | return -ENOMEM; | |
293 | ||
294 | chip->dev = &i2c->dev; | |
295 | chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_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, PV88080_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 | ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF); | |
313 | if (ret < 0) { | |
314 | dev_err(chip->dev, | |
315 | "Failed to mask B reg: %d\n", ret); | |
316 | return ret; | |
317 | } | |
318 | ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF); | |
319 | if (ret < 0) { | |
320 | dev_err(chip->dev, | |
321 | "Failed to mask C reg: %d\n", ret); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, | |
326 | pv88080_irq_handler, | |
327 | IRQF_TRIGGER_LOW|IRQF_ONESHOT, | |
328 | "pv88080", chip); | |
329 | if (ret != 0) { | |
330 | dev_err(chip->dev, "Failed to request IRQ: %d\n", | |
331 | i2c->irq); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A, | |
336 | PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0); | |
337 | if (ret < 0) { | |
338 | dev_err(chip->dev, | |
339 | "Failed to update mask reg: %d\n", ret); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | } else { | |
344 | dev_warn(chip->dev, "No IRQ configured\n"); | |
345 | } | |
346 | ||
347 | config.dev = chip->dev; | |
348 | config.regmap = chip->regmap; | |
349 | ||
350 | for (i = 0; i < PV88080_MAX_REGULATORS; i++) { | |
351 | if (init_data) | |
352 | config.init_data = &init_data[i]; | |
353 | ||
354 | ret = regmap_read(chip->regmap, | |
355 | pv88080_regulator_info[i].conf2, &conf2); | |
356 | if (ret < 0) | |
357 | return ret; | |
358 | ||
359 | conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) & | |
360 | PV88080_BUCK_VDAC_RANGE_MASK); | |
361 | ||
362 | ret = regmap_read(chip->regmap, | |
363 | pv88080_regulator_info[i].conf5, &conf5); | |
364 | if (ret < 0) | |
365 | return ret; | |
366 | ||
367 | conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) & | |
368 | PV88080_BUCK_VRANGE_GAIN_MASK); | |
369 | ||
370 | pv88080_regulator_info[i].desc.min_uV = | |
371 | pv88080_buck_vol[conf2].min_uV * (conf5+1); | |
372 | pv88080_regulator_info[i].desc.uV_step = | |
373 | pv88080_buck_vol[conf2].uV_step * (conf5+1); | |
374 | pv88080_regulator_info[i].desc.n_voltages = | |
375 | ((pv88080_buck_vol[conf2].max_uV * (conf5+1)) | |
376 | - (pv88080_regulator_info[i].desc.min_uV)) | |
377 | /(pv88080_regulator_info[i].desc.uV_step) + 1; | |
378 | ||
379 | config.driver_data = (void *)&pv88080_regulator_info[i]; | |
380 | chip->rdev[i] = devm_regulator_register(chip->dev, | |
381 | &pv88080_regulator_info[i].desc, &config); | |
382 | if (IS_ERR(chip->rdev[i])) { | |
383 | dev_err(chip->dev, | |
384 | "Failed to register PV88080 regulator\n"); | |
385 | return PTR_ERR(chip->rdev[i]); | |
386 | } | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static const struct i2c_device_id pv88080_i2c_id[] = { | |
393 | {"pv88080", 0}, | |
394 | {}, | |
395 | }; | |
396 | MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id); | |
397 | ||
398 | #ifdef CONFIG_OF | |
399 | static const struct of_device_id pv88080_dt_ids[] = { | |
400 | { .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] }, | |
401 | {}, | |
402 | }; | |
403 | MODULE_DEVICE_TABLE(of, pv88080_dt_ids); | |
404 | #endif | |
405 | ||
406 | static struct i2c_driver pv88080_regulator_driver = { | |
407 | .driver = { | |
408 | .name = "pv88080", | |
409 | .of_match_table = of_match_ptr(pv88080_dt_ids), | |
410 | }, | |
411 | .probe = pv88080_i2c_probe, | |
412 | .id_table = pv88080_i2c_id, | |
413 | }; | |
414 | ||
415 | module_i2c_driver(pv88080_regulator_driver); | |
416 | ||
417 | MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); | |
418 | MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080"); | |
419 | MODULE_LICENSE("GPL"); |