summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/pv88080-regulator.c
blob: d7107566c4294ce5bb184fbba42a8f852b7ec12e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/*
 * pv88080-regulator.c - Regulator device driver for PV88080
 * Copyright (C) 2016  Powerventure Semiconductor Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/regulator/of_regulator.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include "pv88080-regulator.h"

#define PV88080_MAX_REGULATORS	3

/* PV88080 REGULATOR IDs */
enum {
	/* BUCKs */
	PV88080_ID_BUCK1,
	PV88080_ID_BUCK2,
	PV88080_ID_BUCK3,
};

struct pv88080_regulator {
	struct regulator_desc desc;
	/* Current limiting */
	unsigned int n_current_limits;
	const int *current_limits;
	unsigned int limit_mask;
	unsigned int conf;
	unsigned int conf2;
	unsigned int conf5;
};

struct pv88080 {
	struct device *dev;
	struct regmap *regmap;
	struct regulator_dev *rdev[PV88080_MAX_REGULATORS];
};

struct pv88080_buck_voltage {
	int min_uV;
	int max_uV;
	int uV_step;
};

static const struct regmap_config pv88080_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
 * Entry indexes corresponds to register values.
 */

static const int pv88080_buck1_limits[] = {
	3230000, 5130000, 6960000, 8790000
};

static const int pv88080_buck23_limits[] = {
	1496000, 2393000, 3291000, 4189000
};

static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {
	{
		.min_uV = 600000,
		.max_uV = 1393750,
		.uV_step = 6250,
	},
	{
		.min_uV = 1400000,
		.max_uV = 2193750,
		.uV_step = 6250,
	},
};

static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)
{
	struct pv88080_regulator *info = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret, mode = 0;

	ret = regmap_read(rdev->regmap, info->conf, &data);
	if (ret < 0)
		return ret;

	switch (data & PV88080_BUCK1_MODE_MASK) {
	case PV88080_BUCK_MODE_SYNC:
		mode = REGULATOR_MODE_FAST;
		break;
	case PV88080_BUCK_MODE_AUTO:
		mode = REGULATOR_MODE_NORMAL;
		break;
	case PV88080_BUCK_MODE_SLEEP:
		mode = REGULATOR_MODE_STANDBY;
		break;
	default:
		return -EINVAL;
	}

	return mode;
}

static int pv88080_buck_set_mode(struct regulator_dev *rdev,
					unsigned int mode)
{
	struct pv88080_regulator *info = rdev_get_drvdata(rdev);
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = PV88080_BUCK_MODE_SYNC;
		break;
	case REGULATOR_MODE_NORMAL:
		val = PV88080_BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = PV88080_BUCK_MODE_SLEEP;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, info->conf,
					PV88080_BUCK1_MODE_MASK, val);
}

static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,
				    int max)
{
	struct pv88080_regulator *info = rdev_get_drvdata(rdev);
	int i;

	/* search for closest to maximum */
	for (i = info->n_current_limits; i >= 0; i--) {
		if (min <= info->current_limits[i]
			&& max >= info->current_limits[i]) {
				return regmap_update_bits(rdev->regmap,
					info->conf,
					info->limit_mask,
					i << PV88080_BUCK1_ILIM_SHIFT);
		}
	}

	return -EINVAL;
}

static int pv88080_get_current_limit(struct regulator_dev *rdev)
{
	struct pv88080_regulator *info = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;

	ret = regmap_read(rdev->regmap, info->conf, &data);
	if (ret < 0)
		return ret;

	data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;
	return info->current_limits[data];
}

static struct regulator_ops pv88080_buck_ops = {
	.get_mode = pv88080_buck_get_mode,
	.set_mode = pv88080_buck_set_mode,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_current_limit = pv88080_set_current_limit,
	.get_current_limit = pv88080_get_current_limit,
};

#define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \
{\
	.desc	=	{\
		.id = chip##_ID_##regl_name,\
		.name = __stringify(chip##_##regl_name),\
		.of_match = of_match_ptr(#regl_name),\
		.regulators_node = of_match_ptr("regulators"),\
		.type = REGULATOR_VOLTAGE,\
		.owner = THIS_MODULE,\
		.ops = &pv88080_buck_ops,\
		.min_uV = min, \
		.uV_step = step, \
		.n_voltages = ((max) - (min))/(step) + 1, \
		.enable_reg = PV88080_REG_##regl_name##_CONF0, \
		.enable_mask = PV88080_##regl_name##_EN, \
		.vsel_reg = PV88080_REG_##regl_name##_CONF0, \
		.vsel_mask = PV88080_V##regl_name##_MASK, \
	},\
	.current_limits = limits_array, \
	.n_current_limits = ARRAY_SIZE(limits_array), \
	.limit_mask = PV88080_##regl_name##_ILIM_MASK, \
	.conf = PV88080_REG_##regl_name##_CONF1, \
	.conf2 = PV88080_REG_##regl_name##_CONF2, \
	.conf5 = PV88080_REG_##regl_name##_CONF5, \
}

static struct pv88080_regulator pv88080_regulator_info[] = {
	PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,
		pv88080_buck1_limits),
	PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,
		pv88080_buck23_limits),
	PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,
		pv88080_buck23_limits),
};

static irqreturn_t pv88080_irq_handler(int irq, void *data)
{
	struct pv88080 *chip = data;
	int i, reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, &reg_val);
	if (err < 0)
		goto error_i2c;

	if (reg_val & PV88080_E_VDD_FLT) {
		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
			if (chip->rdev[i] != NULL) {
				regulator_notifier_call_chain(chip->rdev[i],
					REGULATOR_EVENT_UNDER_VOLTAGE,
					NULL);
			}
		}

		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
			PV88080_E_VDD_FLT);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	if (reg_val & PV88080_E_OVER_TEMP) {
		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
			if (chip->rdev[i] != NULL) {
				regulator_notifier_call_chain(chip->rdev[i],
					REGULATOR_EVENT_OVER_TEMP,
					NULL);
			}
		}

		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
			PV88080_E_OVER_TEMP);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	return ret;

error_i2c:
	dev_err(chip->dev, "I2C error : %d\n", err);
	return IRQ_NONE;
}

/*
 * I2C driver interface functions
 */
static int pv88080_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
	struct pv88080 *chip;
	struct regulator_config config = { };
	int i, error, ret;
	unsigned int conf2, conf5;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &i2c->dev;
	chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_regmap_config);
	if (IS_ERR(chip->regmap)) {
		error = PTR_ERR(chip->regmap);
		dev_err(chip->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	i2c_set_clientdata(i2c, chip);

	if (i2c->irq != 0) {
		ret = regmap_write(chip->regmap, PV88080_REG_MASK_A, 0xFF);
		if (ret < 0) {
			dev_err(chip->dev,
				"Failed to mask A reg: %d\n", ret);
			return ret;
		}
		ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF);
		if (ret < 0) {
			dev_err(chip->dev,
				"Failed to mask B reg: %d\n", ret);
			return ret;
		}
		ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);
		if (ret < 0) {
			dev_err(chip->dev,
				"Failed to mask C reg: %d\n", ret);
			return ret;
		}

		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
					pv88080_irq_handler,
					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
					"pv88080", chip);
		if (ret != 0) {
			dev_err(chip->dev, "Failed to request IRQ: %d\n",
				i2c->irq);
			return ret;
		}

		ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A,
			PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0);
		if (ret < 0) {
			dev_err(chip->dev,
				"Failed to update mask reg: %d\n", ret);
			return ret;
		}

	} else {
		dev_warn(chip->dev, "No IRQ configured\n");
	}

	config.dev = chip->dev;
	config.regmap = chip->regmap;

	for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
		if (init_data)
			config.init_data = &init_data[i];

		ret = regmap_read(chip->regmap,
			pv88080_regulator_info[i].conf2, &conf2);
		if (ret < 0)
			return ret;

		conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &
			PV88080_BUCK_VDAC_RANGE_MASK);

		ret = regmap_read(chip->regmap,
			pv88080_regulator_info[i].conf5, &conf5);
		if (ret < 0)
			return ret;

		conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &
			PV88080_BUCK_VRANGE_GAIN_MASK);

		pv88080_regulator_info[i].desc.min_uV =
			pv88080_buck_vol[conf2].min_uV * (conf5+1);
		pv88080_regulator_info[i].desc.uV_step =
			pv88080_buck_vol[conf2].uV_step * (conf5+1);
		pv88080_regulator_info[i].desc.n_voltages =
			((pv88080_buck_vol[conf2].max_uV * (conf5+1))
			- (pv88080_regulator_info[i].desc.min_uV))
			/(pv88080_regulator_info[i].desc.uV_step) + 1;

		config.driver_data = (void *)&pv88080_regulator_info[i];
		chip->rdev[i] = devm_regulator_register(chip->dev,
			&pv88080_regulator_info[i].desc, &config);
		if (IS_ERR(chip->rdev[i])) {
			dev_err(chip->dev,
				"Failed to register PV88080 regulator\n");
			return PTR_ERR(chip->rdev[i]);
		}
	}

	return 0;
}

static const struct i2c_device_id pv88080_i2c_id[] = {
	{"pv88080", 0},
	{},
};
MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);

#ifdef CONFIG_OF
static const struct of_device_id pv88080_dt_ids[] = {
	{ .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },
	{},
};
MODULE_DEVICE_TABLE(of, pv88080_dt_ids);
#endif

static struct i2c_driver pv88080_regulator_driver = {
	.driver = {
		.name = "pv88080",
		.of_match_table = of_match_ptr(pv88080_dt_ids),
	},
	.probe = pv88080_i2c_probe,
	.id_table = pv88080_i2c_id,
};

module_i2c_driver(pv88080_regulator_driver);

MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud