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 
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 
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 
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, &reg_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  */
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 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
401 		.of_match_table = of_match_ptr(pv88090_dt_ids),
402 	},
403 	.probe = pv88090_i2c_probe,
404 	.id_table = pv88090_i2c_id,
405 };
406 
407 module_i2c_driver(pv88090_regulator_driver);
408 
409 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
410 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
411 MODULE_LICENSE("GPL");
412