1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // DA9121 Single-channel dual-phase 10A buck converter
4 //
5 // Copyright (C) 2020 Axis Communications AB
6 //
7 // DA9130 Single-channel dual-phase 10A buck converter (Automotive)
8 // DA9217 Single-channel dual-phase  6A buck converter
9 // DA9122 Dual-channel single-phase  5A buck converter
10 // DA9131 Dual-channel single-phase  5A buck converter (Automotive)
11 // DA9220 Dual-channel single-phase  3A buck converter
12 // DA9132 Dual-channel single-phase  3A buck converter (Automotive)
13 //
14 // Copyright (C) 2020 Dialog Semiconductor
15 
16 #include <linux/of_device.h>
17 #include <linux/of_gpio.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/regulator/of_regulator.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/module.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/i2c.h>
26 #include <linux/regulator/da9121.h>
27 #include <linux/interrupt.h>
28 #include <linux/workqueue.h>
29 
30 #include "da9121-regulator.h"
31 
32 /* Chip data */
33 struct da9121 {
34 	struct device *dev;
35 	struct delayed_work work;
36 	struct da9121_pdata *pdata;
37 	struct regmap *regmap;
38 	struct regulator_dev *rdev[DA9121_IDX_MAX];
39 	unsigned int persistent[2];
40 	unsigned int passive_delay;
41 	int chip_irq;
42 	int variant_id;
43 	int subvariant_id;
44 };
45 
46 /* Define ranges for different variants, enabling translation to/from
47  * registers. Maximums give scope to allow for transients.
48  */
49 struct da9121_range {
50 	int val_min;
51 	int val_max;
52 	int val_stp;
53 	int reg_min;
54 	int reg_max;
55 };
56 
57 static struct da9121_range da9121_10A_2phase_current = {
58 	.val_min =  7000000,
59 	.val_max = 20000000,
60 	.val_stp =  1000000,
61 	.reg_min = 1,
62 	.reg_max = 14,
63 };
64 
65 static struct da9121_range da9121_6A_2phase_current = {
66 	.val_min =  7000000,
67 	.val_max = 12000000,
68 	.val_stp =  1000000,
69 	.reg_min = 1,
70 	.reg_max = 6,
71 };
72 
73 static struct da9121_range da9121_5A_1phase_current = {
74 	.val_min =  3500000,
75 	.val_max = 10000000,
76 	.val_stp =   500000,
77 	.reg_min = 1,
78 	.reg_max = 14,
79 };
80 
81 static struct da9121_range da9121_3A_1phase_current = {
82 	.val_min = 3500000,
83 	.val_max = 6000000,
84 	.val_stp =  500000,
85 	.reg_min = 1,
86 	.reg_max = 6,
87 };
88 
89 static struct da9121_range da914x_40A_4phase_current = {
90 	.val_min = 26000000,
91 	.val_max = 78000000,
92 	.val_stp =  4000000,
93 	.reg_min = 1,
94 	.reg_max = 14,
95 };
96 
97 static struct da9121_range da914x_20A_2phase_current = {
98 	.val_min = 13000000,
99 	.val_max = 39000000,
100 	.val_stp =  2000000,
101 	.reg_min = 1,
102 	.reg_max = 14,
103 };
104 
105 struct da9121_variant_info {
106 	int num_bucks;
107 	int num_phases;
108 	struct da9121_range *current_range;
109 };
110 
111 static const struct da9121_variant_info variant_parameters[] = {
112 	{ 1, 2, &da9121_10A_2phase_current },	//DA9121_TYPE_DA9121_DA9130
113 	{ 2, 1, &da9121_3A_1phase_current  },	//DA9121_TYPE_DA9220_DA9132
114 	{ 2, 1, &da9121_5A_1phase_current  },	//DA9121_TYPE_DA9122_DA9131
115 	{ 1, 2, &da9121_6A_2phase_current  },	//DA9121_TYPE_DA9217
116 	{ 1, 4, &da914x_40A_4phase_current },   //DA9121_TYPE_DA9141
117 	{ 1, 2, &da914x_20A_2phase_current },   //DA9121_TYPE_DA9142
118 };
119 
120 struct da9121_field {
121 	unsigned int reg;
122 	unsigned int msk;
123 };
124 
125 static const struct da9121_field da9121_current_field[2] = {
126 	{ DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
127 	{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
128 };
129 
130 static const struct da9121_field da9121_mode_field[2] = {
131 	{ DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
132 	{ DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
133 };
134 
135 struct status_event_data {
136 	int buck_id; /* 0=core, 1/2-buck */
137 	int reg_index;  /* index for status/event/mask register selection */
138 	int status_bit; /* bit masks... */
139 	int event_bit;
140 	int mask_bit;
141 	unsigned long notification; /* Notification for status inception */
142 	char *warn; /* if NULL, notify - otherwise dev_warn this string */
143 };
144 
145 #define DA9121_STATUS(id, bank, name, notification, warning) \
146 	{ id, bank, \
147 	DA9121_MASK_SYS_STATUS_##bank##_##name, \
148 	DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
149 	DA9121_MASK_SYS_MASK_##bank##_M_##name, \
150 	notification, warning }
151 
152 /* For second buck related event bits that are specific to DA9122, DA9220 variants */
153 #define DA9xxx_STATUS(id, bank, name, notification, warning) \
154 	{ id, bank, \
155 	DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
156 	DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
157 	DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
158 	notification, warning }
159 
160 /* The status signals that may need servicing, depending on device variant.
161  * After assertion, they persist; so event is notified, the IRQ disabled,
162  * and status polled until clear again and IRQ is reenabled.
163  *
164  * SG/PG1/PG2 should be set when device first powers up and should never
165  * re-occur. When this driver starts, it is expected that these will have
166  * self-cleared for when the IRQs are enabled, so these should never be seen.
167  * If seen, the implication is that the device has reset.
168  *
169  * GPIO0/1/2 are not configured for use by default, so should not be seen.
170  */
171 static const struct status_event_data status_event_handling[] = {
172 	DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
173 	DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
174 	DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
175 	DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
176 	DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
177 	DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
178 	DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
179 	DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
180 	DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
181 	DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
182 	DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
183 	DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
184 	DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
185 	DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
186 };
187 
da9121_get_current_limit(struct regulator_dev * rdev)188 static int da9121_get_current_limit(struct regulator_dev *rdev)
189 {
190 	struct da9121 *chip = rdev_get_drvdata(rdev);
191 	int id = rdev_get_id(rdev);
192 	struct da9121_range *range =
193 		variant_parameters[chip->variant_id].current_range;
194 	unsigned int val = 0;
195 	int ret = 0;
196 
197 	ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
198 	if (ret < 0) {
199 		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
200 		goto error;
201 	}
202 
203 	if (val < range->reg_min) {
204 		ret = -EACCES;
205 		goto error;
206 	}
207 
208 	if (val > range->reg_max) {
209 		ret = -EINVAL;
210 		goto error;
211 	}
212 
213 	return range->val_min + (range->val_stp * (val - range->reg_min));
214 error:
215 	return ret;
216 }
217 
da9121_ceiling_selector(struct regulator_dev * rdev,int min,int max,unsigned int * selector)218 static int da9121_ceiling_selector(struct regulator_dev *rdev,
219 		int min, int max,
220 		unsigned int *selector)
221 {
222 	struct da9121 *chip = rdev_get_drvdata(rdev);
223 	struct da9121_range *range =
224 		variant_parameters[chip->variant_id].current_range;
225 	unsigned int level;
226 	unsigned int i = 0;
227 	unsigned int sel = 0;
228 	int ret = 0;
229 
230 	if (range->val_min > max || range->val_max < min) {
231 		dev_err(chip->dev,
232 			"Requested current out of regulator capability\n");
233 		ret = -EINVAL;
234 		goto error;
235 	}
236 
237 	level = range->val_max;
238 	for (i = range->reg_max; i >= range->reg_min; i--) {
239 		if (level <= max) {
240 			sel = i;
241 			break;
242 		}
243 		level -= range->val_stp;
244 	}
245 
246 	if (level < min) {
247 		dev_err(chip->dev,
248 			"Best match falls below minimum requested current\n");
249 		ret = -EINVAL;
250 		goto error;
251 	}
252 
253 	*selector = sel;
254 error:
255 	return ret;
256 }
257 
da9121_set_current_limit(struct regulator_dev * rdev,int min_ua,int max_ua)258 static int da9121_set_current_limit(struct regulator_dev *rdev,
259 				int min_ua, int max_ua)
260 {
261 	struct da9121 *chip = rdev_get_drvdata(rdev);
262 	int id = rdev_get_id(rdev);
263 	struct da9121_range *range =
264 		variant_parameters[chip->variant_id].current_range;
265 	unsigned int sel = 0;
266 	int ret = 0;
267 
268 	if (min_ua < range->val_min ||
269 	    max_ua > range->val_max) {
270 		ret = -EINVAL;
271 		goto error;
272 	}
273 
274 	if (rdev->desc->ops->is_enabled(rdev)) {
275 		ret = -EBUSY;
276 		goto error;
277 	}
278 
279 	ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
280 	if (ret < 0)
281 		goto error;
282 
283 	ret = regmap_update_bits(chip->regmap,
284 				da9121_current_field[id].reg,
285 				da9121_current_field[id].msk,
286 				(unsigned int)sel);
287 	if (ret < 0)
288 		dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
289 
290 error:
291 	return ret;
292 }
293 
da9121_map_mode(unsigned int mode)294 static unsigned int da9121_map_mode(unsigned int mode)
295 {
296 	switch (mode) {
297 	case DA9121_BUCK_MODE_FORCE_PWM:
298 		return REGULATOR_MODE_FAST;
299 	case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
300 		return REGULATOR_MODE_NORMAL;
301 	case DA9121_BUCK_MODE_AUTO:
302 		return REGULATOR_MODE_IDLE;
303 	case DA9121_BUCK_MODE_FORCE_PFM:
304 		return REGULATOR_MODE_STANDBY;
305 	default:
306 		return REGULATOR_MODE_INVALID;
307 	}
308 }
309 
da9121_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)310 static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
311 {
312 	struct da9121 *chip = rdev_get_drvdata(rdev);
313 	int id = rdev_get_id(rdev);
314 	unsigned int val;
315 
316 	switch (mode) {
317 	case REGULATOR_MODE_FAST:
318 		val = DA9121_BUCK_MODE_FORCE_PWM;
319 		break;
320 	case REGULATOR_MODE_NORMAL:
321 		val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
322 		break;
323 	case REGULATOR_MODE_IDLE:
324 		val = DA9121_BUCK_MODE_AUTO;
325 		break;
326 	case REGULATOR_MODE_STANDBY:
327 		val = DA9121_BUCK_MODE_FORCE_PFM;
328 		break;
329 	default:
330 		return -EINVAL;
331 	}
332 
333 	return regmap_update_bits(chip->regmap,
334 				  da9121_mode_field[id].reg,
335 				  da9121_mode_field[id].msk,
336 				  val);
337 }
338 
da9121_buck_get_mode(struct regulator_dev * rdev)339 static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
340 {
341 	struct da9121 *chip = rdev_get_drvdata(rdev);
342 	int id = rdev_get_id(rdev);
343 	unsigned int val, mode;
344 	int ret = 0;
345 
346 	ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
347 	if (ret < 0) {
348 		dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
349 		return -EINVAL;
350 	}
351 
352 	mode = da9121_map_mode(val & da9121_mode_field[id].msk);
353 	if (mode == REGULATOR_MODE_INVALID)
354 		return -EINVAL;
355 
356 	return mode;
357 }
358 
359 static const struct regulator_ops da9121_buck_ops = {
360 	.enable = regulator_enable_regmap,
361 	.disable = regulator_disable_regmap,
362 	.is_enabled = regulator_is_enabled_regmap,
363 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
364 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
365 	.list_voltage = regulator_list_voltage_linear,
366 	.get_current_limit = da9121_get_current_limit,
367 	.set_current_limit = da9121_set_current_limit,
368 	.set_mode = da9121_buck_set_mode,
369 	.get_mode = da9121_buck_get_mode,
370 };
371 
372 static struct of_regulator_match da9121_matches[] = {
373 	[DA9121_IDX_BUCK1] = { .name = "buck1" },
374 	[DA9121_IDX_BUCK2] = { .name = "buck2" },
375 };
376 
da9121_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)377 static int da9121_of_parse_cb(struct device_node *np,
378 				const struct regulator_desc *desc,
379 				struct regulator_config *config)
380 {
381 	struct da9121 *chip = config->driver_data;
382 	struct da9121_pdata *pdata;
383 	struct gpio_desc *ena_gpiod;
384 
385 	if (chip->pdata == NULL) {
386 		pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
387 		if (!pdata)
388 			return -ENOMEM;
389 	} else {
390 		pdata = chip->pdata;
391 	}
392 
393 	pdata->num_buck++;
394 
395 	if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
396 		dev_err(chip->dev, "Error: excessive regulators for device\n");
397 		return -ENODEV;
398 	}
399 
400 	ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
401 						GPIOD_OUT_HIGH |
402 						GPIOD_FLAGS_BIT_NONEXCLUSIVE,
403 						"da9121-enable");
404 	if (!IS_ERR(ena_gpiod))
405 		config->ena_gpiod = ena_gpiod;
406 
407 	if (variant_parameters[chip->variant_id].num_bucks == 2) {
408 		uint32_t ripple_cancel;
409 		uint32_t ripple_reg;
410 		int ret;
411 
412 		if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
413 				"dlg,ripple-cancel", &ripple_cancel)) {
414 			if (pdata->num_buck > 1)
415 				ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
416 			else
417 				ripple_reg = DA9121_REG_BUCK_BUCK1_7;
418 
419 			ret = regmap_update_bits(chip->regmap, ripple_reg,
420 				DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
421 				ripple_cancel);
422 			if (ret < 0)
423 				dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
424 		}
425 	}
426 
427 	return 0;
428 }
429 
430 #define DA9121_MIN_MV		300
431 #define DA9121_MAX_MV		1900
432 #define DA9121_STEP_MV		10
433 #define DA9121_MIN_SEL		(DA9121_MIN_MV / DA9121_STEP_MV)
434 #define DA9121_N_VOLTAGES	(((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
435 				 + 1 + DA9121_MIN_SEL)
436 
437 static const struct regulator_desc da9121_reg = {
438 	.id = DA9121_IDX_BUCK1,
439 	.name = "da9121",
440 	.of_match = "buck1",
441 	.of_parse_cb = da9121_of_parse_cb,
442 	.owner = THIS_MODULE,
443 	.regulators_node = "regulators",
444 	.of_map_mode = da9121_map_mode,
445 	.ops = &da9121_buck_ops,
446 	.type = REGULATOR_VOLTAGE,
447 	.n_voltages = DA9121_N_VOLTAGES,
448 	.min_uV = DA9121_MIN_MV * 1000,
449 	.uV_step = DA9121_STEP_MV * 1000,
450 	.linear_min_sel = DA9121_MIN_SEL,
451 	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
452 	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
453 	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
454 	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
455 	/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
456 	.ramp_delay = 20000,
457 	/* tBUCK_EN */
458 	.enable_time = 20,
459 };
460 
461 static const struct regulator_desc da9220_reg[2] = {
462 	{
463 		.id = DA9121_IDX_BUCK1,
464 		.name = "DA9220/DA9132 BUCK1",
465 		.of_match = "buck1",
466 		.of_parse_cb = da9121_of_parse_cb,
467 		.owner = THIS_MODULE,
468 		.regulators_node = "regulators",
469 		.of_map_mode = da9121_map_mode,
470 		.ops = &da9121_buck_ops,
471 		.type = REGULATOR_VOLTAGE,
472 		.n_voltages = DA9121_N_VOLTAGES,
473 		.min_uV = DA9121_MIN_MV * 1000,
474 		.uV_step = DA9121_STEP_MV * 1000,
475 		.linear_min_sel = DA9121_MIN_SEL,
476 		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
477 		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
478 		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
479 		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
480 	},
481 	{
482 		.id = DA9121_IDX_BUCK2,
483 		.name = "DA9220/DA9132 BUCK2",
484 		.of_match = "buck2",
485 		.of_parse_cb = da9121_of_parse_cb,
486 		.owner = THIS_MODULE,
487 		.regulators_node = "regulators",
488 		.of_map_mode = da9121_map_mode,
489 		.ops = &da9121_buck_ops,
490 		.type = REGULATOR_VOLTAGE,
491 		.n_voltages = DA9121_N_VOLTAGES,
492 		.min_uV = DA9121_MIN_MV * 1000,
493 		.uV_step = DA9121_STEP_MV * 1000,
494 		.linear_min_sel = DA9121_MIN_SEL,
495 		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
496 		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
497 		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
498 		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
499 	}
500 };
501 
502 static const struct regulator_desc da9122_reg[2] = {
503 	{
504 		.id = DA9121_IDX_BUCK1,
505 		.name = "DA9122/DA9131 BUCK1",
506 		.of_match = "buck1",
507 		.of_parse_cb = da9121_of_parse_cb,
508 		.owner = THIS_MODULE,
509 		.regulators_node = "regulators",
510 		.of_map_mode = da9121_map_mode,
511 		.ops = &da9121_buck_ops,
512 		.type = REGULATOR_VOLTAGE,
513 		.n_voltages = DA9121_N_VOLTAGES,
514 		.min_uV = DA9121_MIN_MV * 1000,
515 		.uV_step = DA9121_STEP_MV * 1000,
516 		.linear_min_sel = DA9121_MIN_SEL,
517 		.enable_reg = DA9121_REG_BUCK_BUCK1_0,
518 		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
519 		.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
520 		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
521 	},
522 	{
523 		.id = DA9121_IDX_BUCK2,
524 		.name = "DA9122/DA9131 BUCK2",
525 		.of_match = "buck2",
526 		.of_parse_cb = da9121_of_parse_cb,
527 		.owner = THIS_MODULE,
528 		.regulators_node = "regulators",
529 		.of_map_mode = da9121_map_mode,
530 		.ops = &da9121_buck_ops,
531 		.type = REGULATOR_VOLTAGE,
532 		.n_voltages = DA9121_N_VOLTAGES,
533 		.min_uV = DA9121_MIN_MV * 1000,
534 		.uV_step = DA9121_STEP_MV * 1000,
535 		.linear_min_sel = DA9121_MIN_SEL,
536 		.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
537 		.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
538 		.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
539 		.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
540 	}
541 };
542 
543 static const struct regulator_desc da9217_reg = {
544 	.id = DA9121_IDX_BUCK1,
545 	.name = "DA9217 BUCK1",
546 	.of_match = "buck1",
547 	.of_parse_cb = da9121_of_parse_cb,
548 	.owner = THIS_MODULE,
549 	.regulators_node = "regulators",
550 	.of_map_mode = da9121_map_mode,
551 	.ops = &da9121_buck_ops,
552 	.type = REGULATOR_VOLTAGE,
553 	.n_voltages = DA9121_N_VOLTAGES,
554 	.min_uV = DA9121_MIN_MV * 1000,
555 	.uV_step = DA9121_STEP_MV * 1000,
556 	.linear_min_sel = DA9121_MIN_SEL,
557 	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
558 	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
559 	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
560 	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
561 };
562 
563 #define DA914X_MIN_MV		500
564 #define DA914X_MAX_MV		1300
565 #define DA914X_STEP_MV		10
566 #define DA914X_MIN_SEL		(DA914X_MIN_MV / DA914X_STEP_MV)
567 #define DA914X_N_VOLTAGES	(((DA914X_MAX_MV - DA914X_MIN_MV) / DA914X_STEP_MV) \
568 				 + 1 + DA914X_MIN_SEL)
569 
570 static const struct regulator_desc da9141_reg = {
571 	.id = DA9121_IDX_BUCK1,
572 	.name = "DA9141",
573 	.of_match = "buck1",
574 	.of_parse_cb = da9121_of_parse_cb,
575 	.owner = THIS_MODULE,
576 	.regulators_node = "regulators",
577 	.of_map_mode = da9121_map_mode,
578 	.ops = &da9121_buck_ops,
579 	.type = REGULATOR_VOLTAGE,
580 	.n_voltages = DA914X_N_VOLTAGES,
581 	.min_uV = DA914X_MIN_MV * 1000,
582 	.uV_step = DA914X_STEP_MV * 1000,
583 	.linear_min_sel = DA914X_MIN_SEL,
584 	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
585 	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
586 	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
587 	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
588 };
589 
590 static const struct regulator_desc da9142_reg = {
591 	.id = DA9121_IDX_BUCK1,
592 	.name = "DA9142 BUCK1",
593 	.of_match = "buck1",
594 	.of_parse_cb = da9121_of_parse_cb,
595 	.owner = THIS_MODULE,
596 	.regulators_node = "regulators",
597 	.of_map_mode = da9121_map_mode,
598 	.ops = &da9121_buck_ops,
599 	.type = REGULATOR_VOLTAGE,
600 	.n_voltages = DA914X_N_VOLTAGES,
601 	.min_uV = DA914X_MIN_MV * 1000,
602 	.uV_step = DA914X_STEP_MV * 1000,
603 	.linear_min_sel = DA914X_MIN_SEL,
604 	.enable_reg = DA9121_REG_BUCK_BUCK1_0,
605 	.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
606 	.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
607 	.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
608 };
609 
610 
611 static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
612 	[DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
613 	[DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
614 	[DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
615 	[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
616 	[DA9121_TYPE_DA9141] = { &da9141_reg, NULL },
617 	[DA9121_TYPE_DA9142] = { &da9142_reg, NULL },
618 };
619 
da9121_status_poll_on(struct work_struct * work)620 static void da9121_status_poll_on(struct work_struct *work)
621 {
622 	struct da9121 *chip = container_of(work, struct da9121, work.work);
623 	int status[3] = {0};
624 	int clear[3] = {0};
625 	unsigned long delay;
626 	int i;
627 	int ret;
628 
629 	ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
630 	if (ret < 0) {
631 		dev_err(chip->dev,
632 			"Failed to read STATUS registers: %d\n", ret);
633 		goto error;
634 	}
635 
636 	/* Possible events are tested to be within range for the variant, potentially
637 	 * masked by the IRQ handler (not just warned about), as having been masked,
638 	 * and the respective state cleared - then flagged to unmask for next IRQ.
639 	 */
640 	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
641 		const struct status_event_data *item = &status_event_handling[i];
642 		int reg_idx = item->reg_index;
643 		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
644 		bool supported = (item->warn == NULL);
645 		bool persisting = (chip->persistent[reg_idx] & item->event_bit);
646 		bool now_cleared = !(status[reg_idx] & item->status_bit);
647 
648 		if (relevant && supported && persisting && now_cleared) {
649 			clear[reg_idx] |= item->mask_bit;
650 			chip->persistent[reg_idx] &= ~item->event_bit;
651 		}
652 	}
653 
654 	for (i = 0; i < 2; i++) {
655 		if (clear[i]) {
656 			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
657 			unsigned int mbit = clear[i];
658 
659 			ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
660 			if (ret < 0) {
661 				dev_err(chip->dev,
662 					"Failed to unmask 0x%02x %d\n",
663 					reg, ret);
664 				goto error;
665 			}
666 		}
667 	}
668 
669 	if (chip->persistent[0] | chip->persistent[1]) {
670 		delay = msecs_to_jiffies(chip->passive_delay);
671 		queue_delayed_work(system_freezable_wq, &chip->work, delay);
672 	}
673 
674 error:
675 	return;
676 }
677 
da9121_irq_handler(int irq,void * data)678 static irqreturn_t da9121_irq_handler(int irq, void *data)
679 {
680 	struct da9121 *chip = data;
681 	struct regulator_dev *rdev;
682 	int event[3] = {0};
683 	int handled[3] = {0};
684 	int mask[3] = {0};
685 	int ret = IRQ_NONE;
686 	int i;
687 	int err;
688 
689 	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
690 	if (err < 0) {
691 		dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
692 		ret = IRQ_NONE;
693 		goto error;
694 	}
695 
696 	err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
697 	if (err < 0) {
698 		dev_err(chip->dev,
699 			"Failed to read MASK registers: %d\n", ret);
700 		ret = IRQ_NONE;
701 		goto error;
702 	}
703 
704 	rdev = chip->rdev[DA9121_IDX_BUCK1];
705 
706 	/* Possible events are tested to be within range for the variant, currently
707 	 * enabled, and having triggered this IRQ. The event may then be notified,
708 	 * or a warning given for unexpected events - those from device POR, and
709 	 * currently unsupported GPIO configurations.
710 	 */
711 	for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
712 		const struct status_event_data *item = &status_event_handling[i];
713 		int reg_idx = item->reg_index;
714 		bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
715 		bool enabled = !(mask[reg_idx] & item->mask_bit);
716 		bool active = (event[reg_idx] & item->event_bit);
717 		bool notify = (item->warn == NULL);
718 
719 		if (relevant && enabled && active) {
720 			if (notify) {
721 				chip->persistent[reg_idx] |= item->event_bit;
722 				regulator_notifier_call_chain(rdev, item->notification, NULL);
723 			} else {
724 				dev_warn(chip->dev, item->warn);
725 				handled[reg_idx] |= item->event_bit;
726 				ret = IRQ_HANDLED;
727 			}
728 		}
729 	}
730 
731 	for (i = 0; i < 3; i++) {
732 		if (event[i] != handled[i]) {
733 			dev_warn(chip->dev,
734 				"Unhandled event(s) in bank%d 0x%02x\n", i,
735 				event[i] ^ handled[i]);
736 		}
737 	}
738 
739 	/* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
740 	for (i = 0; i < 2; i++) {
741 		if (handled[i]) {
742 			unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
743 			unsigned int mbit = handled[i];
744 
745 			err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
746 			if (err < 0) {
747 				dev_err(chip->dev,
748 					"Failed to mask 0x%02x interrupt %d\n",
749 					reg, err);
750 				ret = IRQ_NONE;
751 				goto error;
752 			}
753 		}
754 	}
755 
756 	/* clear the events */
757 	if (handled[0] | handled[1] | handled[2]) {
758 		err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
759 		if (err < 0) {
760 			dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
761 			ret = IRQ_NONE;
762 			goto error;
763 		}
764 	}
765 
766 	queue_delayed_work(system_freezable_wq, &chip->work, 0);
767 error:
768 	return ret;
769 }
770 
da9121_set_regulator_config(struct da9121 * chip)771 static int da9121_set_regulator_config(struct da9121 *chip)
772 {
773 	struct regulator_config config = { };
774 	unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
775 	int ret = 0;
776 	int i;
777 
778 	for (i = 0; i < max_matches; i++) {
779 		const struct regulator_desc *regl_desc =
780 			local_da9121_regulators[chip->variant_id][i];
781 
782 		config.dev = chip->dev;
783 		config.driver_data = chip;
784 		config.regmap = chip->regmap;
785 
786 		chip->rdev[i] = devm_regulator_register(chip->dev,
787 					regl_desc, &config);
788 		if (IS_ERR(chip->rdev[i])) {
789 			dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
790 				regl_desc->name, (i+1), max_matches);
791 			ret = PTR_ERR(chip->rdev[i]);
792 			goto error;
793 		}
794 	}
795 
796 error:
797 	return ret;
798 }
799 
800 /* DA9121 chip register model */
801 static const struct regmap_range da9121_1ch_readable_ranges[] = {
802 	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
803 	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
804 	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
805 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
806 	regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
807 };
808 
809 static const struct regmap_access_table da9121_1ch_readable_table = {
810 	.yes_ranges = da9121_1ch_readable_ranges,
811 	.n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
812 };
813 
814 static const struct regmap_range da9121_2ch_readable_ranges[] = {
815 	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
816 	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
817 	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
818 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
819 	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
820 	regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
821 };
822 
823 static const struct regmap_access_table da9121_2ch_readable_table = {
824 	.yes_ranges = da9121_2ch_readable_ranges,
825 	.n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
826 };
827 
828 static const struct regmap_range da9121_1ch_writeable_ranges[] = {
829 	regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
830 	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
831 	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
832 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
833 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
834 };
835 
836 static const struct regmap_access_table da9121_1ch_writeable_table = {
837 	.yes_ranges = da9121_1ch_writeable_ranges,
838 	.n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
839 };
840 
841 static const struct regmap_range da9121_2ch_writeable_ranges[] = {
842 	regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
843 	regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
844 	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
845 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
846 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
847 	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
848 	regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
849 };
850 
851 static const struct regmap_access_table da9121_2ch_writeable_table = {
852 	.yes_ranges = da9121_2ch_writeable_ranges,
853 	.n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
854 };
855 
856 
857 static const struct regmap_range da9121_volatile_ranges[] = {
858 	regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
859 	regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
860 	regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
861 };
862 
863 static const struct regmap_access_table da9121_volatile_table = {
864 	.yes_ranges = da9121_volatile_ranges,
865 	.n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
866 };
867 
868 /* DA9121 regmap config for 1 channel variants */
869 static struct regmap_config da9121_1ch_regmap_config = {
870 	.reg_bits = 8,
871 	.val_bits = 8,
872 	.max_register = DA9121_REG_OTP_CONFIG_ID,
873 	.rd_table = &da9121_1ch_readable_table,
874 	.wr_table = &da9121_1ch_writeable_table,
875 	.volatile_table = &da9121_volatile_table,
876 	.cache_type = REGCACHE_RBTREE,
877 };
878 
879 /* DA9121 regmap config for 2 channel variants */
880 static struct regmap_config da9121_2ch_regmap_config = {
881 	.reg_bits = 8,
882 	.val_bits = 8,
883 	.max_register = DA9121_REG_OTP_CONFIG_ID,
884 	.rd_table = &da9121_2ch_readable_table,
885 	.wr_table = &da9121_2ch_writeable_table,
886 	.volatile_table = &da9121_volatile_table,
887 	.cache_type = REGCACHE_RBTREE,
888 };
889 
da9121_check_device_type(struct i2c_client * i2c,struct da9121 * chip)890 static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
891 {
892 	u32 device_id;
893 	u32 variant_id;
894 	u8 variant_mrc, variant_vrc;
895 	char *type;
896 	bool config_match = false;
897 	int ret = 0;
898 
899 	ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
900 	if (ret < 0) {
901 		dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
902 		goto error;
903 	}
904 
905 	ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
906 	if (ret < 0) {
907 		dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
908 		goto error;
909 	}
910 
911 	if ((device_id != DA9121_DEVICE_ID) && (device_id != DA914x_DEVICE_ID)) {
912 		dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
913 		ret = -ENODEV;
914 		goto error;
915 	}
916 
917 	variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
918 
919 	switch (chip->subvariant_id) {
920 	case DA9121_SUBTYPE_DA9121:
921 		type = "DA9121";
922 		config_match = (variant_vrc == DA9121_VARIANT_VRC);
923 		break;
924 	case DA9121_SUBTYPE_DA9130:
925 		type = "DA9130";
926 		config_match = (variant_vrc == DA9130_VARIANT_VRC);
927 		break;
928 	case DA9121_SUBTYPE_DA9220:
929 		type = "DA9220";
930 		config_match = (variant_vrc == DA9220_VARIANT_VRC);
931 		break;
932 	case DA9121_SUBTYPE_DA9132:
933 		type = "DA9132";
934 		config_match = (variant_vrc == DA9132_VARIANT_VRC);
935 		break;
936 	case DA9121_SUBTYPE_DA9122:
937 		type = "DA9122";
938 		config_match = (variant_vrc == DA9122_VARIANT_VRC);
939 		break;
940 	case DA9121_SUBTYPE_DA9131:
941 		type = "DA9131";
942 		config_match = (variant_vrc == DA9131_VARIANT_VRC);
943 		break;
944 	case DA9121_SUBTYPE_DA9217:
945 		type = "DA9217";
946 		config_match = (variant_vrc == DA9217_VARIANT_VRC);
947 		break;
948 	default:
949 		type = "Unknown";
950 		break;
951 	}
952 
953 	if (device_id == DA914x_DEVICE_ID) {
954 		switch (chip->subvariant_id) {
955 		case DA9121_SUBTYPE_DA9141:
956 			type = "DA9141";
957 			config_match = (variant_vrc == DA9141_VARIANT_VRC);
958 			break;
959 		case DA9121_SUBTYPE_DA9142:
960 			type = "DA9142";
961 			config_match = (variant_vrc == DA9142_VARIANT_VRC);
962 			break;
963 		default:
964 			type = "Unknown";
965 			break;
966 		}
967 	}
968 
969 	dev_info(chip->dev,
970 		 "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
971 		 device_id, variant_id, type);
972 
973 	if (!config_match) {
974 		dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
975 		ret = -EINVAL;
976 		goto error;
977 	}
978 
979 	variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
980 			>> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
981 
982 	if (((device_id == DA9121_DEVICE_ID) &&
983 	     (variant_mrc < DA9121_VARIANT_MRC_BASE)) ||
984 	    ((device_id == DA914x_DEVICE_ID) &&
985 	     (variant_mrc != DA914x_VARIANT_MRC_BASE))) {
986 		dev_err(chip->dev,
987 			"Cannot support variant MRC: 0x%02X\n", variant_mrc);
988 		ret = -EINVAL;
989 	}
990 error:
991 	return ret;
992 }
993 
da9121_assign_chip_model(struct i2c_client * i2c,struct da9121 * chip)994 static int da9121_assign_chip_model(struct i2c_client *i2c,
995 			struct da9121 *chip)
996 {
997 	struct regmap_config *regmap;
998 	int ret = 0;
999 
1000 	chip->dev = &i2c->dev;
1001 
1002 	/* Use configured subtype to select the regulator descriptor index and
1003 	 * register map, common to both consumer and automotive grade variants
1004 	 */
1005 	switch (chip->subvariant_id) {
1006 	case DA9121_SUBTYPE_DA9121:
1007 	case DA9121_SUBTYPE_DA9130:
1008 		chip->variant_id = DA9121_TYPE_DA9121_DA9130;
1009 		regmap = &da9121_1ch_regmap_config;
1010 		break;
1011 	case DA9121_SUBTYPE_DA9217:
1012 		chip->variant_id = DA9121_TYPE_DA9217;
1013 		regmap = &da9121_1ch_regmap_config;
1014 		break;
1015 	case DA9121_SUBTYPE_DA9122:
1016 	case DA9121_SUBTYPE_DA9131:
1017 		chip->variant_id = DA9121_TYPE_DA9122_DA9131;
1018 		regmap = &da9121_2ch_regmap_config;
1019 		break;
1020 	case DA9121_SUBTYPE_DA9220:
1021 	case DA9121_SUBTYPE_DA9132:
1022 		chip->variant_id = DA9121_TYPE_DA9220_DA9132;
1023 		regmap = &da9121_2ch_regmap_config;
1024 		break;
1025 	case DA9121_SUBTYPE_DA9141:
1026 		chip->variant_id = DA9121_TYPE_DA9141;
1027 		regmap = &da9121_1ch_regmap_config;
1028 		break;
1029 	case DA9121_SUBTYPE_DA9142:
1030 		chip->variant_id = DA9121_TYPE_DA9142;
1031 		regmap = &da9121_2ch_regmap_config;
1032 		break;
1033 	default:
1034 		return -EINVAL;
1035 	}
1036 
1037 	/* Set these up for of_regulator_match call which may want .of_map_modes */
1038 	da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
1039 	da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
1040 
1041 	chip->regmap = devm_regmap_init_i2c(i2c, regmap);
1042 	if (IS_ERR(chip->regmap)) {
1043 		ret = PTR_ERR(chip->regmap);
1044 		dev_err(chip->dev, "Failed to configure a register map: %d\n",
1045 			ret);
1046 		return ret;
1047 	}
1048 
1049 	ret = da9121_check_device_type(i2c, chip);
1050 
1051 	return ret;
1052 }
1053 
da9121_config_irq(struct i2c_client * i2c,struct da9121 * chip)1054 static int da9121_config_irq(struct i2c_client *i2c,
1055 			struct da9121 *chip)
1056 {
1057 	unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
1058 	const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
1059 	int ret = 0;
1060 
1061 	chip->chip_irq = i2c->irq;
1062 
1063 	if (chip->chip_irq != 0) {
1064 		if (!of_property_read_u32(chip->dev->of_node,
1065 					  "dlg,irq-polling-delay-passive-ms",
1066 					  &p_delay)) {
1067 			if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
1068 			    p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
1069 				dev_warn(chip->dev,
1070 					 "Out-of-range polling period %d ms\n",
1071 					 p_delay);
1072 				p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
1073 			}
1074 		}
1075 
1076 		chip->passive_delay = p_delay;
1077 
1078 		ret = request_threaded_irq(chip->chip_irq, NULL,
1079 					da9121_irq_handler,
1080 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
1081 					"da9121", chip);
1082 		if (ret != 0) {
1083 			dev_err(chip->dev, "Failed IRQ request: %d\n",
1084 				chip->chip_irq);
1085 			goto error;
1086 		}
1087 
1088 		ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1089 		if (ret != 0) {
1090 			dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
1091 				ret);
1092 			goto regmap_error;
1093 		}
1094 
1095 		INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
1096 		dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
1097 			 chip->passive_delay);
1098 	}
1099 error:
1100 	return ret;
1101 regmap_error:
1102 	free_irq(chip->chip_irq, chip);
1103 	return ret;
1104 }
1105 
1106 static const struct of_device_id da9121_dt_ids[] = {
1107 	{ .compatible = "dlg,da9121", .data = (void *) DA9121_SUBTYPE_DA9121 },
1108 	{ .compatible = "dlg,da9130", .data = (void *) DA9121_SUBTYPE_DA9130 },
1109 	{ .compatible = "dlg,da9217", .data = (void *) DA9121_SUBTYPE_DA9217 },
1110 	{ .compatible = "dlg,da9122", .data = (void *) DA9121_SUBTYPE_DA9122 },
1111 	{ .compatible = "dlg,da9131", .data = (void *) DA9121_SUBTYPE_DA9131 },
1112 	{ .compatible = "dlg,da9220", .data = (void *) DA9121_SUBTYPE_DA9220 },
1113 	{ .compatible = "dlg,da9132", .data = (void *) DA9121_SUBTYPE_DA9132 },
1114 	{ .compatible = "dlg,da9141", .data = (void *) DA9121_SUBTYPE_DA9141 },
1115 	{ .compatible = "dlg,da9142", .data = (void *) DA9121_SUBTYPE_DA9142 },
1116 	{ }
1117 };
1118 MODULE_DEVICE_TABLE(of, da9121_dt_ids);
1119 
da9121_of_get_id(struct device * dev)1120 static inline int da9121_of_get_id(struct device *dev)
1121 {
1122 	const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
1123 
1124 	if (!id) {
1125 		dev_err(dev, "%s: Failed\n", __func__);
1126 		return -EINVAL;
1127 	}
1128 	return (uintptr_t)id->data;
1129 }
1130 
da9121_i2c_probe(struct i2c_client * i2c)1131 static int da9121_i2c_probe(struct i2c_client *i2c)
1132 {
1133 	struct da9121 *chip;
1134 	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1135 	int ret = 0;
1136 
1137 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
1138 	if (!chip) {
1139 		ret = -ENOMEM;
1140 		goto error;
1141 	}
1142 
1143 	chip->pdata = i2c->dev.platform_data;
1144 	chip->subvariant_id = da9121_of_get_id(&i2c->dev);
1145 
1146 	ret = da9121_assign_chip_model(i2c, chip);
1147 	if (ret < 0)
1148 		goto error;
1149 
1150 	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1151 	if (ret != 0) {
1152 		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1153 		goto error;
1154 	}
1155 
1156 	ret = da9121_set_regulator_config(chip);
1157 	if (ret < 0)
1158 		goto error;
1159 
1160 	ret = da9121_config_irq(i2c, chip);
1161 
1162 error:
1163 	return ret;
1164 }
1165 
da9121_i2c_remove(struct i2c_client * i2c)1166 static void da9121_i2c_remove(struct i2c_client *i2c)
1167 {
1168 	struct da9121 *chip = i2c_get_clientdata(i2c);
1169 	const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1170 	int ret;
1171 
1172 	free_irq(chip->chip_irq, chip);
1173 	cancel_delayed_work_sync(&chip->work);
1174 
1175 	ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1176 	if (ret != 0)
1177 		dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1178 }
1179 
1180 static const struct i2c_device_id da9121_i2c_id[] = {
1181 	{"da9121", DA9121_TYPE_DA9121_DA9130},
1182 	{"da9130", DA9121_TYPE_DA9121_DA9130},
1183 	{"da9217", DA9121_TYPE_DA9217},
1184 	{"da9122", DA9121_TYPE_DA9122_DA9131},
1185 	{"da9131", DA9121_TYPE_DA9122_DA9131},
1186 	{"da9220", DA9121_TYPE_DA9220_DA9132},
1187 	{"da9132", DA9121_TYPE_DA9220_DA9132},
1188 	{"da9141", DA9121_TYPE_DA9141},
1189 	{"da9142", DA9121_TYPE_DA9142},
1190 	{},
1191 };
1192 MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
1193 
1194 static struct i2c_driver da9121_regulator_driver = {
1195 	.driver = {
1196 		.name = "da9121",
1197 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1198 		.of_match_table = da9121_dt_ids,
1199 	},
1200 	.probe = da9121_i2c_probe,
1201 	.remove = da9121_i2c_remove,
1202 	.id_table = da9121_i2c_id,
1203 };
1204 
1205 module_i2c_driver(da9121_regulator_driver);
1206 
1207 MODULE_LICENSE("GPL v2");
1208