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 */
32 enum {
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 
43 struct pv88090_regulator {
44 	struct regulator_desc desc;
45 	/* Current limiting */
46 	unsigned	n_current_limits;
47 	const int	*current_limits;
48 	unsigned int limit_mask;
49 	unsigned int conf;
50 	unsigned int conf2;
51 };
52 
53 struct pv88090 {
54 	struct device *dev;
55 	struct regmap *regmap;
56 	struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
57 };
58 
59 struct pv88090_buck_voltage {
60 	int min_uV;
61 	int max_uV;
62 	int uV_step;
63 };
64 
65 static const struct regmap_config pv88090_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 pv88090_buck1_limits[] = {
75 	 220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
76 	1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
77 	3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
78 	5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
79 };
80 
81 static const int pv88090_buck23_limits[] = {
82 	1496000, 2393000, 3291000, 4189000
83 };
84 
85 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
86 	{
87 		.min_uV = 600000,
88 		.max_uV = 1393750,
89 		.uV_step = 6250,
90 	},
91 
92 	{
93 		.min_uV = 1400000,
94 		.max_uV = 2193750,
95 		.uV_step = 6250,
96 	},
97 	{
98 		.min_uV = 1250000,
99 		.max_uV = 2837500,
100 		.uV_step = 12500,
101 	},
102 };
103 
104 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
105 {
106 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
107 	unsigned int data;
108 	int ret, mode = 0;
109 
110 	ret = regmap_read(rdev->regmap, info->conf, &data);
111 	if (ret < 0)
112 		return ret;
113 
114 	switch (data & PV88090_BUCK1_MODE_MASK) {
115 	case PV88090_BUCK_MODE_SYNC:
116 		mode = REGULATOR_MODE_FAST;
117 		break;
118 	case PV88090_BUCK_MODE_AUTO:
119 		mode = REGULATOR_MODE_NORMAL;
120 		break;
121 	case PV88090_BUCK_MODE_SLEEP:
122 		mode = REGULATOR_MODE_STANDBY;
123 		break;
124 	}
125 
126 	return mode;
127 }
128 
129 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
130 					unsigned int mode)
131 {
132 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
133 	int val = 0;
134 
135 	switch (mode) {
136 	case REGULATOR_MODE_FAST:
137 		val = PV88090_BUCK_MODE_SYNC;
138 		break;
139 	case REGULATOR_MODE_NORMAL:
140 		val = PV88090_BUCK_MODE_AUTO;
141 		break;
142 	case REGULATOR_MODE_STANDBY:
143 		val = PV88090_BUCK_MODE_SLEEP;
144 		break;
145 	default:
146 		return -EINVAL;
147 	}
148 
149 	return regmap_update_bits(rdev->regmap, info->conf,
150 					PV88090_BUCK1_MODE_MASK, val);
151 }
152 
153 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
154 				    int max)
155 {
156 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
157 	int i;
158 
159 	/* search for closest to maximum */
160 	for (i = info->n_current_limits; i >= 0; i--) {
161 		if (min <= info->current_limits[i]
162 			&& max >= info->current_limits[i]) {
163 			return regmap_update_bits(rdev->regmap,
164 				info->conf,
165 				info->limit_mask,
166 				i << PV88090_BUCK1_ILIM_SHIFT);
167 		}
168 	}
169 
170 	return -EINVAL;
171 }
172 
173 static int pv88090_get_current_limit(struct regulator_dev *rdev)
174 {
175 	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
176 	unsigned int data;
177 	int ret;
178 
179 	ret = regmap_read(rdev->regmap, info->conf, &data);
180 	if (ret < 0)
181 		return ret;
182 
183 	data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
184 	return info->current_limits[data];
185 }
186 
187 static const struct regulator_ops pv88090_buck_ops = {
188 	.get_mode = pv88090_buck_get_mode,
189 	.set_mode = pv88090_buck_set_mode,
190 	.enable = regulator_enable_regmap,
191 	.disable = regulator_disable_regmap,
192 	.is_enabled = regulator_is_enabled_regmap,
193 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
194 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
195 	.list_voltage = regulator_list_voltage_linear,
196 	.set_current_limit = pv88090_set_current_limit,
197 	.get_current_limit = pv88090_get_current_limit,
198 };
199 
200 static const struct regulator_ops pv88090_ldo_ops = {
201 	.enable = regulator_enable_regmap,
202 	.disable = regulator_disable_regmap,
203 	.is_enabled = regulator_is_enabled_regmap,
204 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
205 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
206 	.list_voltage = regulator_list_voltage_linear,
207 };
208 
209 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
210 {\
211 	.desc	=	{\
212 		.id = chip##_ID_##regl_name,\
213 		.name = __stringify(chip##_##regl_name),\
214 		.of_match = of_match_ptr(#regl_name),\
215 		.regulators_node = of_match_ptr("regulators"),\
216 		.type = REGULATOR_VOLTAGE,\
217 		.owner = THIS_MODULE,\
218 		.ops = &pv88090_buck_ops,\
219 		.min_uV = min, \
220 		.uV_step = step, \
221 		.n_voltages = ((max) - (min))/(step) + 1, \
222 		.enable_reg = PV88090_REG_##regl_name##_CONF0, \
223 		.enable_mask = PV88090_##regl_name##_EN, \
224 		.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
225 		.vsel_mask = PV88090_V##regl_name##_MASK, \
226 	},\
227 	.current_limits = limits_array, \
228 	.n_current_limits = ARRAY_SIZE(limits_array), \
229 	.limit_mask = PV88090_##regl_name##_ILIM_MASK, \
230 	.conf = PV88090_REG_##regl_name##_CONF1, \
231 	.conf2 = PV88090_REG_##regl_name##_CONF2, \
232 }
233 
234 #define PV88090_LDO(chip, regl_name, min, step, max) \
235 {\
236 	.desc	=	{\
237 		.id = chip##_ID_##regl_name,\
238 		.name = __stringify(chip##_##regl_name),\
239 		.of_match = of_match_ptr(#regl_name),\
240 		.regulators_node = of_match_ptr("regulators"),\
241 		.type = REGULATOR_VOLTAGE,\
242 		.owner = THIS_MODULE,\
243 		.ops = &pv88090_ldo_ops,\
244 		.min_uV = min, \
245 		.uV_step = step, \
246 		.n_voltages = ((max) - (min))/(step) + 1, \
247 		.enable_reg = PV88090_REG_##regl_name##_CONT, \
248 		.enable_mask = PV88090_##regl_name##_EN, \
249 		.vsel_reg = PV88090_REG_##regl_name##_CONT, \
250 		.vsel_mask = PV88090_V##regl_name##_MASK, \
251 	},\
252 }
253 
254 static struct pv88090_regulator pv88090_regulator_info[] = {
255 	PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
256 		pv88090_buck1_limits),
257 	PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
258 		pv88090_buck23_limits),
259 	PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
260 		pv88090_buck23_limits),
261 	PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
262 	PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
263 };
264 
265 static irqreturn_t pv88090_irq_handler(int irq, void *data)
266 {
267 	struct pv88090 *chip = data;
268 	int i, reg_val, err, ret = IRQ_NONE;
269 
270 	err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
271 	if (err < 0)
272 		goto error_i2c;
273 
274 	if (reg_val & PV88090_E_VDD_FLT) {
275 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
276 			if (chip->rdev[i] != NULL) {
277 				regulator_notifier_call_chain(chip->rdev[i],
278 					REGULATOR_EVENT_UNDER_VOLTAGE,
279 					NULL);
280 			}
281 		}
282 
283 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
284 			PV88090_E_VDD_FLT);
285 		if (err < 0)
286 			goto error_i2c;
287 
288 		ret = IRQ_HANDLED;
289 	}
290 
291 	if (reg_val & PV88090_E_OVER_TEMP) {
292 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
293 			if (chip->rdev[i] != NULL) {
294 				regulator_notifier_call_chain(chip->rdev[i],
295 					REGULATOR_EVENT_OVER_TEMP,
296 					NULL);
297 			}
298 		}
299 
300 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
301 			PV88090_E_OVER_TEMP);
302 		if (err < 0)
303 			goto error_i2c;
304 
305 		ret = IRQ_HANDLED;
306 	}
307 
308 	return ret;
309 
310 error_i2c:
311 	dev_err(chip->dev, "I2C error : %d\n", err);
312 	return IRQ_NONE;
313 }
314 
315 /*
316  * I2C driver interface functions
317  */
318 static int pv88090_i2c_probe(struct i2c_client *i2c,
319 		const struct i2c_device_id *id)
320 {
321 	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
322 	struct pv88090 *chip;
323 	struct regulator_config config = { };
324 	int error, i, ret = 0;
325 	unsigned int conf2, range, index;
326 
327 	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
328 	if (!chip)
329 		return -ENOMEM;
330 
331 	chip->dev = &i2c->dev;
332 	chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
333 	if (IS_ERR(chip->regmap)) {
334 		error = PTR_ERR(chip->regmap);
335 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
336 			error);
337 		return error;
338 	}
339 
340 	i2c_set_clientdata(i2c, chip);
341 
342 	if (i2c->irq != 0) {
343 		ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
344 		if (ret < 0) {
345 			dev_err(chip->dev,
346 				"Failed to mask A reg: %d\n", ret);
347 			return ret;
348 		}
349 
350 		ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
351 		if (ret < 0) {
352 			dev_err(chip->dev,
353 				"Failed to mask B reg: %d\n", ret);
354 			return ret;
355 		}
356 
357 		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
358 					pv88090_irq_handler,
359 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
360 					"pv88090", chip);
361 		if (ret != 0) {
362 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
363 				i2c->irq);
364 			return ret;
365 		}
366 
367 		ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
368 			PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
369 		if (ret < 0) {
370 			dev_err(chip->dev,
371 				"Failed to update mask reg: %d\n", ret);
372 			return ret;
373 		}
374 
375 	} else {
376 		dev_warn(chip->dev, "No IRQ configured\n");
377 	}
378 
379 	config.dev = chip->dev;
380 	config.regmap = chip->regmap;
381 
382 	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
383 		if (init_data)
384 			config.init_data = &init_data[i];
385 
386 		if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
387 			ret = regmap_read(chip->regmap,
388 				pv88090_regulator_info[i].conf2, &conf2);
389 			if (ret < 0)
390 				return ret;
391 
392 			conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
393 				PV88090_BUCK_VDAC_RANGE_MASK;
394 
395 			ret = regmap_read(chip->regmap,
396 				PV88090_REG_BUCK_FOLD_RANGE, &range);
397 			if (ret < 0)
398 				return ret;
399 
400 			range = (range >>
401 				 (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
402 				PV88080_BUCK_VRANGE_GAIN_MASK;
403 			index = ((range << 1) | conf2);
404 
405 			pv88090_regulator_info[i].desc.min_uV
406 				= pv88090_buck_vol[index].min_uV;
407 			pv88090_regulator_info[i].desc.uV_step
408 				= pv88090_buck_vol[index].uV_step;
409 			pv88090_regulator_info[i].desc.n_voltages
410 				= ((pv88090_buck_vol[index].max_uV)
411 				- (pv88090_buck_vol[index].min_uV))
412 				/(pv88090_buck_vol[index].uV_step) + 1;
413 		}
414 
415 		config.driver_data = (void *)&pv88090_regulator_info[i];
416 		chip->rdev[i] = devm_regulator_register(chip->dev,
417 			&pv88090_regulator_info[i].desc, &config);
418 		if (IS_ERR(chip->rdev[i])) {
419 			dev_err(chip->dev,
420 				"Failed to register PV88090 regulator\n");
421 			return PTR_ERR(chip->rdev[i]);
422 		}
423 	}
424 
425 	return 0;
426 }
427 
428 static const struct i2c_device_id pv88090_i2c_id[] = {
429 	{"pv88090", 0},
430 	{},
431 };
432 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
433 
434 #ifdef CONFIG_OF
435 static const struct of_device_id pv88090_dt_ids[] = {
436 	{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
437 	{},
438 };
439 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
440 #endif
441 
442 static struct i2c_driver pv88090_regulator_driver = {
443 	.driver = {
444 		.name = "pv88090",
445 		.of_match_table = of_match_ptr(pv88090_dt_ids),
446 	},
447 	.probe = pv88090_i2c_probe,
448 	.id_table = pv88090_i2c_id,
449 };
450 
451 module_i2c_driver(pv88090_regulator_driver);
452 
453 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
454 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
455 MODULE_LICENSE("GPL");
456