1 // SPDX-License-Identifier: GPL-2.0+
2 
3 #include <dt-bindings/regulator/richtek,rt5190a-regulator.h>
4 #include <linux/bits.h>
5 #include <linux/i2c.h>
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/property.h>
11 #include <linux/regmap.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regulator/of_regulator.h>
15 
16 #define RT5190A_REG_MANUFACTURE		0x00
17 #define RT5190A_REG_BUCK2VSEL		0x04
18 #define RT5190A_REG_BUCK3VSEL		0x05
19 #define RT5190A_REG_DCDCCNTL		0x06
20 #define RT5190A_REG_ENABLE		0x07
21 #define RT5190A_REG_DISCHARGE		0x09
22 #define RT5190A_REG_PROTMODE		0x0A
23 #define RT5190A_REG_MUTECNTL		0x0B
24 #define RT5190A_REG_PGSTAT		0x0F
25 #define RT5190A_REG_OVINT		0x10
26 #define RT5190A_REG_HOTDIEMASK		0x17
27 
28 #define RT5190A_VSEL_MASK		GENMASK(6, 0)
29 #define RT5190A_RID_BITMASK(rid)	BIT(rid + 1)
30 #define RT5190A_BUCK1_DISCHG_MASK	GENMASK(1, 0)
31 #define RT5190A_BUCK1_DISCHG_ONVAL	0x01
32 #define RT5190A_OVERVOLT_MASK		GENMASK(7, 0)
33 #define RT5190A_UNDERVOLT_MASK		GENMASK(15, 8)
34 #define RT5190A_CH234OT_MASK		BIT(29)
35 #define RT5190A_CHIPOT_MASK		BIT(28)
36 
37 #define RT5190A_BUCK23_MINUV		600000
38 #define RT5190A_BUCK23_MAXUV		1400000
39 #define RT5190A_BUCK23_STEPUV		10000
40 #define RT5190A_BUCK23_STEPNUM		((1400000 - 600000) / 10000 + 1)
41 
42 enum {
43 	RT5190A_IDX_BUCK1 = 0,
44 	RT5190A_IDX_BUCK2,
45 	RT5190A_IDX_BUCK3,
46 	RT5190A_IDX_BUCK4,
47 	RT5190A_IDX_LDO,
48 	RT5190A_MAX_IDX
49 };
50 
51 struct rt5190a_priv {
52 	struct device *dev;
53 	struct regmap *regmap;
54 	struct regulator_desc rdesc[RT5190A_MAX_IDX];
55 	struct regulator_dev *rdev[RT5190A_MAX_IDX];
56 };
57 
58 static int rt5190a_get_error_flags(struct regulator_dev *rdev,
59 				   unsigned int *flags)
60 {
61 	struct regmap *regmap = rdev_get_regmap(rdev);
62 	int rid = rdev_get_id(rdev);
63 	unsigned int pgood_stat;
64 	int ret;
65 
66 	ret = regmap_read(regmap, RT5190A_REG_PGSTAT, &pgood_stat);
67 	if (ret)
68 		return ret;
69 
70 	if (!(pgood_stat & RT5190A_RID_BITMASK(rid)))
71 		*flags = REGULATOR_ERROR_FAIL;
72 	else
73 		*flags = 0;
74 
75 	return 0;
76 }
77 
78 static int rt5190a_fixed_buck_set_mode(struct regulator_dev *rdev,
79 				       unsigned int mode)
80 {
81 	struct regmap *regmap = rdev_get_regmap(rdev);
82 	int rid = rdev_get_id(rdev);
83 	unsigned int mask = RT5190A_RID_BITMASK(rid), val;
84 
85 	switch (mode) {
86 	case REGULATOR_MODE_FAST:
87 		val = mask;
88 		break;
89 	case REGULATOR_MODE_NORMAL:
90 		val = 0;
91 		break;
92 	default:
93 		return -EINVAL;
94 	}
95 
96 	return regmap_update_bits(regmap, RT5190A_REG_DCDCCNTL, mask, val);
97 }
98 
99 static unsigned int rt5190a_fixed_buck_get_mode(struct regulator_dev *rdev)
100 {
101 	struct regmap *regmap = rdev_get_regmap(rdev);
102 	int rid = rdev_get_id(rdev);
103 	unsigned int val;
104 	int ret;
105 
106 	ret = regmap_read(regmap, RT5190A_REG_DCDCCNTL, &val);
107 	if (ret) {
108 		dev_err(&rdev->dev, "Failed to get mode [%d]\n", ret);
109 		return ret;
110 	}
111 
112 	if (val & RT5190A_RID_BITMASK(rid))
113 		return REGULATOR_MODE_FAST;
114 
115 	return REGULATOR_MODE_NORMAL;
116 }
117 
118 static const struct regulator_ops rt5190a_ranged_buck_ops = {
119 	.enable	= regulator_enable_regmap,
120 	.disable = regulator_disable_regmap,
121 	.is_enabled = regulator_is_enabled_regmap,
122 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
123 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
124 	.list_voltage = regulator_list_voltage_linear,
125 	.set_active_discharge = regulator_set_active_discharge_regmap,
126 	.get_error_flags = rt5190a_get_error_flags,
127 };
128 
129 static const struct regulator_ops rt5190a_fixed_buck_ops = {
130 	.enable	= regulator_enable_regmap,
131 	.disable = regulator_disable_regmap,
132 	.is_enabled = regulator_is_enabled_regmap,
133 	.set_active_discharge = regulator_set_active_discharge_regmap,
134 	.set_mode = rt5190a_fixed_buck_set_mode,
135 	.get_mode = rt5190a_fixed_buck_get_mode,
136 	.get_error_flags = rt5190a_get_error_flags,
137 };
138 
139 static const struct regulator_ops rt5190a_fixed_ldo_ops = {
140 	.enable	= regulator_enable_regmap,
141 	.disable = regulator_disable_regmap,
142 	.is_enabled = regulator_is_enabled_regmap,
143 	.set_active_discharge = regulator_set_active_discharge_regmap,
144 	.get_error_flags = rt5190a_get_error_flags,
145 };
146 
147 static irqreturn_t rt5190a_irq_handler(int irq, void *data)
148 {
149 	struct rt5190a_priv *priv = data;
150 	__le32 raws;
151 	unsigned int events, fields;
152 	static const struct {
153 		unsigned int bitmask;
154 		unsigned int report;
155 	} event_tbl[] = {
156 		{ RT5190A_OVERVOLT_MASK, REGULATOR_ERROR_REGULATION_OUT },
157 		{ RT5190A_UNDERVOLT_MASK, REGULATOR_ERROR_UNDER_VOLTAGE }
158 	};
159 	int i, j, ret;
160 
161 	ret = regmap_raw_read(priv->regmap, RT5190A_REG_OVINT, &raws,
162 			      sizeof(raws));
163 	if (ret) {
164 		dev_err(priv->dev, "Failed to read events\n");
165 		return IRQ_NONE;
166 	}
167 
168 	events = le32_to_cpu(raws);
169 
170 	ret = regmap_raw_write(priv->regmap, RT5190A_REG_OVINT, &raws,
171 			       sizeof(raws));
172 	if (ret)
173 		dev_err(priv->dev, "Failed to write-clear events\n");
174 
175 	/* Handle OV,UV events */
176 	for (i = 0; i < ARRAY_SIZE(event_tbl); i++) {
177 		fields = events & event_tbl[i].bitmask;
178 		fields >>= ffs(event_tbl[i].bitmask) - 1;
179 
180 		for (j = 0; j < RT5190A_MAX_IDX; j++) {
181 			if (!(fields & RT5190A_RID_BITMASK(j)))
182 				continue;
183 
184 			regulator_notifier_call_chain(priv->rdev[j],
185 						      event_tbl[i].report,
186 						      NULL);
187 		}
188 	}
189 
190 	/* Handle CH234 OT event */
191 	if (events & RT5190A_CH234OT_MASK) {
192 		for (j = RT5190A_IDX_BUCK2; j < RT5190A_IDX_LDO; j++) {
193 			regulator_notifier_call_chain(priv->rdev[j],
194 						      REGULATOR_ERROR_OVER_TEMP,
195 						      NULL);
196 		}
197 	}
198 
199 	/* Warning if CHIP OT occur */
200 	if (events & RT5190A_CHIPOT_MASK)
201 		dev_warn(priv->dev, "CHIP overheat\n");
202 
203 	return IRQ_HANDLED;
204 }
205 
206 static unsigned int rt5190a_of_map_mode(unsigned int mode)
207 {
208 	switch (mode) {
209 	case RT5190A_OPMODE_AUTO:
210 		return REGULATOR_MODE_NORMAL;
211 	case RT5190A_OPMODE_FPWM:
212 		return REGULATOR_MODE_FAST;
213 	default:
214 		return REGULATOR_MODE_INVALID;
215 	}
216 }
217 
218 static int rt5190a_of_parse_cb(struct rt5190a_priv *priv, int rid,
219 			       struct of_regulator_match *match)
220 {
221 	struct regulator_desc *desc = priv->rdesc + rid;
222 	struct regulator_init_data *init_data = match->init_data;
223 	struct device_node *np = match->of_node;
224 	bool latchup_enable;
225 	unsigned int mask = RT5190A_RID_BITMASK(rid), val;
226 
227 	if (!init_data)
228 		return 0;
229 
230 	switch (rid) {
231 	case RT5190A_IDX_BUCK1:
232 	case RT5190A_IDX_BUCK4:
233 	case RT5190A_IDX_LDO:
234 		init_data->constraints.apply_uV = 0;
235 
236 		if (init_data->constraints.min_uV ==
237 				init_data->constraints.max_uV)
238 			desc->fixed_uV = init_data->constraints.min_uV;
239 		else {
240 			dev_err(priv->dev,
241 				"Variable voltage for fixed regulator\n");
242 			return -EINVAL;
243 		}
244 		break;
245 	default:
246 		break;
247 	}
248 
249 	latchup_enable = of_property_read_bool(np, "richtek,latchup-enable");
250 
251 	/* latchup: 0, default hiccup: 1 */
252 	val = !latchup_enable ? mask : 0;
253 
254 	return regmap_update_bits(priv->regmap, RT5190A_REG_PROTMODE, mask, val);
255 }
256 
257 static void rt5190a_fillin_regulator_desc(struct regulator_desc *desc, int rid)
258 {
259 	static const char * const regu_name[] = { "buck1", "buck2",
260 						  "buck3", "buck4",
261 						  "ldo" };
262 	static const char * const supply[] = { NULL, "vin2", "vin3", "vin4",
263 					       "vinldo" };
264 
265 	desc->name = regu_name[rid];
266 	desc->supply_name = supply[rid];
267 	desc->owner = THIS_MODULE;
268 	desc->type = REGULATOR_VOLTAGE;
269 	desc->id = rid;
270 	desc->enable_reg = RT5190A_REG_ENABLE;
271 	desc->enable_mask = RT5190A_RID_BITMASK(rid);
272 	desc->active_discharge_reg = RT5190A_REG_DISCHARGE;
273 	desc->active_discharge_mask = RT5190A_RID_BITMASK(rid);
274 	desc->active_discharge_on = RT5190A_RID_BITMASK(rid);
275 
276 	switch (rid) {
277 	case RT5190A_IDX_BUCK1:
278 		desc->active_discharge_mask = RT5190A_BUCK1_DISCHG_MASK;
279 		desc->active_discharge_on = RT5190A_BUCK1_DISCHG_ONVAL;
280 		desc->n_voltages = 1;
281 		desc->ops = &rt5190a_fixed_buck_ops;
282 		desc->of_map_mode = rt5190a_of_map_mode;
283 		break;
284 	case RT5190A_IDX_BUCK2:
285 		desc->vsel_reg = RT5190A_REG_BUCK2VSEL;
286 		desc->vsel_mask = RT5190A_VSEL_MASK;
287 		desc->min_uV = RT5190A_BUCK23_MINUV;
288 		desc->uV_step = RT5190A_BUCK23_STEPUV;
289 		desc->n_voltages = RT5190A_BUCK23_STEPNUM;
290 		desc->ops = &rt5190a_ranged_buck_ops;
291 		break;
292 	case RT5190A_IDX_BUCK3:
293 		desc->vsel_reg = RT5190A_REG_BUCK3VSEL;
294 		desc->vsel_mask = RT5190A_VSEL_MASK;
295 		desc->min_uV = RT5190A_BUCK23_MINUV;
296 		desc->uV_step = RT5190A_BUCK23_STEPUV;
297 		desc->n_voltages = RT5190A_BUCK23_STEPNUM;
298 		desc->ops = &rt5190a_ranged_buck_ops;
299 		break;
300 	case RT5190A_IDX_BUCK4:
301 		desc->n_voltages = 1;
302 		desc->ops = &rt5190a_fixed_buck_ops;
303 		desc->of_map_mode = rt5190a_of_map_mode;
304 		break;
305 	case RT5190A_IDX_LDO:
306 		desc->n_voltages = 1;
307 		desc->ops = &rt5190a_fixed_ldo_ops;
308 		break;
309 	}
310 }
311 
312 static struct of_regulator_match rt5190a_regulator_match[] = {
313 	{ .name = "buck1", },
314 	{ .name = "buck2", },
315 	{ .name = "buck3", },
316 	{ .name = "buck4", },
317 	{ .name = "ldo", }
318 };
319 
320 static int rt5190a_parse_regulator_dt_data(struct rt5190a_priv *priv)
321 {
322 	struct device_node *regulator_np;
323 	struct regulator_desc *reg_desc;
324 	struct of_regulator_match *match;
325 	int i, ret;
326 
327 	for (i = 0; i < RT5190A_MAX_IDX; i++) {
328 		reg_desc = priv->rdesc + i;
329 		match = rt5190a_regulator_match + i;
330 
331 		rt5190a_fillin_regulator_desc(reg_desc, i);
332 
333 		match->desc = reg_desc;
334 	}
335 
336 	regulator_np = of_get_child_by_name(priv->dev->of_node, "regulators");
337 	if (!regulator_np) {
338 		dev_err(priv->dev, "Could not find 'regulators' node\n");
339 		return -ENODEV;
340 	}
341 
342 	ret = of_regulator_match(priv->dev, regulator_np,
343 				 rt5190a_regulator_match,
344 				 ARRAY_SIZE(rt5190a_regulator_match));
345 
346 	of_node_put(regulator_np);
347 
348 	if (ret < 0) {
349 		dev_err(priv->dev,
350 			"Error parsing regulator init data: %d\n", ret);
351 		return ret;
352 	}
353 
354 	for (i = 0; i < RT5190A_MAX_IDX; i++) {
355 		match = rt5190a_regulator_match + i;
356 
357 		ret = rt5190a_of_parse_cb(priv, i, match);
358 		if (ret) {
359 			dev_err(priv->dev, "Failed in [%d] of_parse_cb\n", i);
360 			return ret;
361 		}
362 	}
363 
364 	return 0;
365 }
366 
367 static const struct reg_sequence rt5190a_init_patch[] = {
368 	{ 0x09, 0x3d, },
369 	{ 0x0a, 0x3e, },
370 	{ 0x0b, 0x01, },
371 	{ 0x10, 0xff, },
372 	{ 0x11, 0xff, },
373 	{ 0x12, 0xff, },
374 	{ 0x13, 0xff, },
375 	{ 0x14, 0, },
376 	{ 0x15, 0, },
377 	{ 0x16, 0x3e, },
378 	{ 0x17, 0, }
379 };
380 
381 static int rt5190a_device_initialize(struct rt5190a_priv *priv)
382 {
383 	bool mute_enable;
384 	int ret;
385 
386 	ret = regmap_register_patch(priv->regmap, rt5190a_init_patch,
387 				    ARRAY_SIZE(rt5190a_init_patch));
388 	if (ret) {
389 		dev_err(priv->dev, "Failed to do register patch\n");
390 		return ret;
391 	}
392 
393 	mute_enable = device_property_read_bool(priv->dev,
394 						"richtek,mute-enable");
395 
396 	if (mute_enable) {
397 		ret = regmap_write(priv->regmap, RT5190A_REG_MUTECNTL, 0x00);
398 		if (ret) {
399 			dev_err(priv->dev, "Failed to enable mute function\n");
400 			return ret;
401 		}
402 	}
403 
404 	return 0;
405 }
406 
407 static int rt5190a_device_check(struct rt5190a_priv *priv)
408 {
409 	u16 devid;
410 	int ret;
411 
412 	ret = regmap_raw_read(priv->regmap, RT5190A_REG_MANUFACTURE, &devid,
413 			      sizeof(devid));
414 	if (ret)
415 		return ret;
416 
417 	if (devid) {
418 		dev_err(priv->dev, "Incorrect device id 0x%04x\n", devid);
419 		return -ENODEV;
420 	}
421 
422 	return 0;
423 }
424 
425 static const struct regmap_config rt5190a_regmap_config = {
426 	.reg_bits = 8,
427 	.val_bits = 8,
428 	.max_register = RT5190A_REG_HOTDIEMASK,
429 };
430 
431 static int rt5190a_probe(struct i2c_client *i2c)
432 {
433 	struct rt5190a_priv *priv;
434 	struct regulator_config cfg = {};
435 	int i, ret;
436 
437 	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
438 	if (!priv)
439 		return -ENOMEM;
440 
441 	priv->dev = &i2c->dev;
442 
443 	priv->regmap = devm_regmap_init_i2c(i2c, &rt5190a_regmap_config);
444 	if (IS_ERR(priv->regmap)) {
445 		dev_err(&i2c->dev, "Failed to allocate regmap\n");
446 		return PTR_ERR(priv->regmap);
447 	}
448 
449 	ret = rt5190a_device_check(priv);
450 	if (ret) {
451 		dev_err(&i2c->dev, "Failed to check device %d\n", ret);
452 		return ret;
453 	}
454 
455 	ret = rt5190a_device_initialize(priv);
456 	if (ret) {
457 		dev_err(&i2c->dev, "Failed to initialize the device\n");
458 		return ret;
459 	}
460 
461 	ret = rt5190a_parse_regulator_dt_data(priv);
462 	if (ret) {
463 		dev_err(&i2c->dev, "Failed to parse regulator dt\n");
464 		return ret;
465 	}
466 
467 	cfg.dev = &i2c->dev;
468 	cfg.regmap = priv->regmap;
469 
470 	for (i = 0; i < RT5190A_MAX_IDX; i++) {
471 		struct regulator_desc *desc = priv->rdesc + i;
472 		struct of_regulator_match *match = rt5190a_regulator_match + i;
473 
474 		cfg.init_data = match->init_data;
475 		cfg.of_node = match->of_node;
476 
477 		priv->rdev[i] = devm_regulator_register(&i2c->dev, desc, &cfg);
478 		if (IS_ERR(priv->rdev[i])) {
479 			dev_err(&i2c->dev, "Failed to register regulator %s\n",
480 				desc->name);
481 			return PTR_ERR(priv->rdev[i]);
482 		}
483 	}
484 
485 	if (i2c->irq) {
486 		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
487 						rt5190a_irq_handler,
488 						IRQF_ONESHOT,
489 						dev_name(&i2c->dev), priv);
490 		if (ret) {
491 			dev_err(&i2c->dev, "Failed to register interrupt\n");
492 			return ret;
493 		}
494 	}
495 
496 	return 0;
497 }
498 
499 static const struct of_device_id __maybe_unused rt5190a_device_table[] = {
500 	{ .compatible = "richtek,rt5190a", },
501 	{}
502 };
503 MODULE_DEVICE_TABLE(of, rt5190a_device_table);
504 
505 static struct i2c_driver rt5190a_driver = {
506 	.driver = {
507 		.name = "rt5190a",
508 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
509 		.of_match_table = rt5190a_device_table,
510 	},
511 	.probe = rt5190a_probe,
512 };
513 module_i2c_driver(rt5190a_driver);
514 
515 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
516 MODULE_DESCRIPTION("Richtek RT5190A Regulator Driver");
517 MODULE_LICENSE("GPL v2");
518