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Merge tag 'vfio-v4.7-rc1' of git://github.com/awilliam/linux-vfio
[deliverable/linux.git] / drivers / regulator / max8973-regulator.c
1 /*
2 * max8973-regulator.c -- Maxim max8973
3 *
4 * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator.
5 *
6 * Copyright (c) 2012, NVIDIA Corporation.
7 *
8 * Author: Laxman Dewangan <ldewangan@nvidia.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation version 2.
13 *
14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
15 * whether express or implied; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 * 02111-1307, USA
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/err.h>
29 #include <linux/of.h>
30 #include <linux/of_device.h>
31 #include <linux/platform_device.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/regulator/machine.h>
34 #include <linux/regulator/max8973-regulator.h>
35 #include <linux/regulator/of_regulator.h>
36 #include <linux/gpio.h>
37 #include <linux/of_gpio.h>
38 #include <linux/i2c.h>
39 #include <linux/slab.h>
40 #include <linux/regmap.h>
41 #include <linux/thermal.h>
42 #include <linux/irq.h>
43 #include <linux/interrupt.h>
44
45 /* Register definitions */
46 #define MAX8973_VOUT 0x0
47 #define MAX8973_VOUT_DVS 0x1
48 #define MAX8973_CONTROL1 0x2
49 #define MAX8973_CONTROL2 0x3
50 #define MAX8973_CHIPID1 0x4
51 #define MAX8973_CHIPID2 0x5
52
53 #define MAX8973_MAX_VOUT_REG 2
54
55 /* MAX8973_VOUT */
56 #define MAX8973_VOUT_ENABLE BIT(7)
57 #define MAX8973_VOUT_MASK 0x7F
58
59 /* MAX8973_VOUT_DVS */
60 #define MAX8973_DVS_VOUT_MASK 0x7F
61
62 /* MAX8973_CONTROL1 */
63 #define MAX8973_SNS_ENABLE BIT(7)
64 #define MAX8973_FPWM_EN_M BIT(6)
65 #define MAX8973_NFSR_ENABLE BIT(5)
66 #define MAX8973_AD_ENABLE BIT(4)
67 #define MAX8973_BIAS_ENABLE BIT(3)
68 #define MAX8973_FREQSHIFT_9PER BIT(2)
69
70 #define MAX8973_RAMP_12mV_PER_US 0x0
71 #define MAX8973_RAMP_25mV_PER_US 0x1
72 #define MAX8973_RAMP_50mV_PER_US 0x2
73 #define MAX8973_RAMP_200mV_PER_US 0x3
74 #define MAX8973_RAMP_MASK 0x3
75
76 /* MAX8973_CONTROL2 */
77 #define MAX8973_WDTMR_ENABLE BIT(6)
78 #define MAX8973_DISCH_ENBABLE BIT(5)
79 #define MAX8973_FT_ENABLE BIT(4)
80 #define MAX77621_T_JUNCTION_120 BIT(7)
81
82 #define MAX8973_CKKADV_TRIP_MASK 0xC
83 #define MAX8973_CKKADV_TRIP_DISABLE 0xC
84 #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0
85 #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4
86 #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8
87 #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000
88
89 #define MAX8973_INDUCTOR_MIN_30_PER 0x0
90 #define MAX8973_INDUCTOR_NOMINAL 0x1
91 #define MAX8973_INDUCTOR_PLUS_30_PER 0x2
92 #define MAX8973_INDUCTOR_PLUS_60_PER 0x3
93 #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000
94
95 #define MAX8973_MIN_VOLATGE 606250
96 #define MAX8973_MAX_VOLATGE 1400000
97 #define MAX8973_VOLATGE_STEP 6250
98 #define MAX8973_BUCK_N_VOLTAGE 0x80
99
100 #define MAX77621_CHIPID_TJINT_S BIT(0)
101
102 #define MAX77621_NORMAL_OPERATING_TEMP 100000
103 #define MAX77621_TJINT_WARNING_TEMP_120 120000
104 #define MAX77621_TJINT_WARNING_TEMP_140 140000
105
106 enum device_id {
107 MAX8973,
108 MAX77621
109 };
110
111 /* Maxim 8973 chip information */
112 struct max8973_chip {
113 struct device *dev;
114 struct regulator_desc desc;
115 struct regmap *regmap;
116 bool enable_external_control;
117 int enable_gpio;
118 int dvs_gpio;
119 int lru_index[MAX8973_MAX_VOUT_REG];
120 int curr_vout_val[MAX8973_MAX_VOUT_REG];
121 int curr_vout_reg;
122 int curr_gpio_val;
123 struct regulator_ops ops;
124 enum device_id id;
125 int junction_temp_warning;
126 int irq;
127 struct thermal_zone_device *tz_device;
128 };
129
130 /*
131 * find_voltage_set_register: Find new voltage configuration register (VOUT).
132 * The finding of the new VOUT register will be based on the LRU mechanism.
133 * Each VOUT register will have different voltage configured . This
134 * Function will look if any of the VOUT register have requested voltage set
135 * or not.
136 * - If it is already there then it will make that register as most
137 * recently used and return as found so that caller need not to set
138 * the VOUT register but need to set the proper gpios to select this
139 * VOUT register.
140 * - If requested voltage is not found then it will use the least
141 * recently mechanism to get new VOUT register for new configuration
142 * and will return not_found so that caller need to set new VOUT
143 * register and then gpios (both).
144 */
145 static bool find_voltage_set_register(struct max8973_chip *tps,
146 int req_vsel, int *vout_reg, int *gpio_val)
147 {
148 int i;
149 bool found = false;
150 int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1];
151 int found_index = MAX8973_MAX_VOUT_REG - 1;
152
153 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) {
154 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) {
155 new_vout_reg = tps->lru_index[i];
156 found_index = i;
157 found = true;
158 goto update_lru_index;
159 }
160 }
161
162 update_lru_index:
163 for (i = found_index; i > 0; i--)
164 tps->lru_index[i] = tps->lru_index[i - 1];
165
166 tps->lru_index[0] = new_vout_reg;
167 *gpio_val = new_vout_reg;
168 *vout_reg = MAX8973_VOUT + new_vout_reg;
169 return found;
170 }
171
172 static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev)
173 {
174 struct max8973_chip *max = rdev_get_drvdata(rdev);
175 unsigned int data;
176 int ret;
177
178 ret = regmap_read(max->regmap, max->curr_vout_reg, &data);
179 if (ret < 0) {
180 dev_err(max->dev, "register %d read failed, err = %d\n",
181 max->curr_vout_reg, ret);
182 return ret;
183 }
184 return data & MAX8973_VOUT_MASK;
185 }
186
187 static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev,
188 unsigned vsel)
189 {
190 struct max8973_chip *max = rdev_get_drvdata(rdev);
191 int ret;
192 bool found = false;
193 int vout_reg = max->curr_vout_reg;
194 int gpio_val = max->curr_gpio_val;
195
196 /*
197 * If gpios are available to select the VOUT register then least
198 * recently used register for new configuration.
199 */
200 if (gpio_is_valid(max->dvs_gpio))
201 found = find_voltage_set_register(max, vsel,
202 &vout_reg, &gpio_val);
203
204 if (!found) {
205 ret = regmap_update_bits(max->regmap, vout_reg,
206 MAX8973_VOUT_MASK, vsel);
207 if (ret < 0) {
208 dev_err(max->dev, "register %d update failed, err %d\n",
209 vout_reg, ret);
210 return ret;
211 }
212 max->curr_vout_reg = vout_reg;
213 max->curr_vout_val[gpio_val] = vsel;
214 }
215
216 /* Select proper VOUT register vio gpios */
217 if (gpio_is_valid(max->dvs_gpio)) {
218 gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1);
219 max->curr_gpio_val = gpio_val;
220 }
221 return 0;
222 }
223
224 static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
225 {
226 struct max8973_chip *max = rdev_get_drvdata(rdev);
227 int ret;
228 int pwm;
229
230 /* Enable force PWM mode in FAST mode only. */
231 switch (mode) {
232 case REGULATOR_MODE_FAST:
233 pwm = MAX8973_FPWM_EN_M;
234 break;
235
236 case REGULATOR_MODE_NORMAL:
237 pwm = 0;
238 break;
239
240 default:
241 return -EINVAL;
242 }
243
244 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
245 MAX8973_FPWM_EN_M, pwm);
246 if (ret < 0)
247 dev_err(max->dev, "register %d update failed, err %d\n",
248 MAX8973_CONTROL1, ret);
249 return ret;
250 }
251
252 static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)
253 {
254 struct max8973_chip *max = rdev_get_drvdata(rdev);
255 unsigned int data;
256 int ret;
257
258 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
259 if (ret < 0) {
260 dev_err(max->dev, "register %d read failed, err %d\n",
261 MAX8973_CONTROL1, ret);
262 return ret;
263 }
264 return (data & MAX8973_FPWM_EN_M) ?
265 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
266 }
267
268 static int max8973_set_ramp_delay(struct regulator_dev *rdev,
269 int ramp_delay)
270 {
271 struct max8973_chip *max = rdev_get_drvdata(rdev);
272 unsigned int control;
273 int ret;
274 int ret_val;
275
276 /* Set ramp delay */
277 if (ramp_delay < 25000) {
278 control = MAX8973_RAMP_12mV_PER_US;
279 ret_val = 12000;
280 } else if (ramp_delay < 50000) {
281 control = MAX8973_RAMP_25mV_PER_US;
282 ret_val = 25000;
283 } else if (ramp_delay < 200000) {
284 control = MAX8973_RAMP_50mV_PER_US;
285 ret_val = 50000;
286 } else {
287 control = MAX8973_RAMP_200mV_PER_US;
288 ret_val = 200000;
289 }
290
291 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
292 MAX8973_RAMP_MASK, control);
293 if (ret < 0)
294 dev_err(max->dev, "register %d update failed, %d",
295 MAX8973_CONTROL1, ret);
296 return ret;
297 }
298
299 static int max8973_set_current_limit(struct regulator_dev *rdev,
300 int min_ua, int max_ua)
301 {
302 struct max8973_chip *max = rdev_get_drvdata(rdev);
303 unsigned int val;
304 int ret;
305
306 if (max_ua <= 9000000)
307 val = MAX8973_CKKADV_TRIP_75mV_PER_US;
308 else if (max_ua <= 12000000)
309 val = MAX8973_CKKADV_TRIP_150mV_PER_US;
310 else
311 val = MAX8973_CKKADV_TRIP_DISABLE;
312
313 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,
314 MAX8973_CKKADV_TRIP_MASK, val);
315 if (ret < 0) {
316 dev_err(max->dev, "register %d update failed: %d\n",
317 MAX8973_CONTROL2, ret);
318 return ret;
319 }
320 return 0;
321 }
322
323 static int max8973_get_current_limit(struct regulator_dev *rdev)
324 {
325 struct max8973_chip *max = rdev_get_drvdata(rdev);
326 unsigned int control2;
327 int ret;
328
329 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);
330 if (ret < 0) {
331 dev_err(max->dev, "register %d read failed: %d\n",
332 MAX8973_CONTROL2, ret);
333 return ret;
334 }
335 switch (control2 & MAX8973_CKKADV_TRIP_MASK) {
336 case MAX8973_CKKADV_TRIP_DISABLE:
337 return 15000000;
338 case MAX8973_CKKADV_TRIP_150mV_PER_US:
339 return 12000000;
340 case MAX8973_CKKADV_TRIP_75mV_PER_US:
341 return 9000000;
342 default:
343 break;
344 }
345 return 9000000;
346 }
347
348 static const struct regulator_ops max8973_dcdc_ops = {
349 .get_voltage_sel = max8973_dcdc_get_voltage_sel,
350 .set_voltage_sel = max8973_dcdc_set_voltage_sel,
351 .list_voltage = regulator_list_voltage_linear,
352 .set_mode = max8973_dcdc_set_mode,
353 .get_mode = max8973_dcdc_get_mode,
354 .set_voltage_time_sel = regulator_set_voltage_time_sel,
355 .set_ramp_delay = max8973_set_ramp_delay,
356 };
357
358 static int max8973_init_dcdc(struct max8973_chip *max,
359 struct max8973_regulator_platform_data *pdata)
360 {
361 int ret;
362 uint8_t control1 = 0;
363 uint8_t control2 = 0;
364 unsigned int data;
365
366 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
367 if (ret < 0) {
368 dev_err(max->dev, "register %d read failed, err = %d",
369 MAX8973_CONTROL1, ret);
370 return ret;
371 }
372 control1 = data & MAX8973_RAMP_MASK;
373 switch (control1) {
374 case MAX8973_RAMP_12mV_PER_US:
375 max->desc.ramp_delay = 12000;
376 break;
377 case MAX8973_RAMP_25mV_PER_US:
378 max->desc.ramp_delay = 25000;
379 break;
380 case MAX8973_RAMP_50mV_PER_US:
381 max->desc.ramp_delay = 50000;
382 break;
383 case MAX8973_RAMP_200mV_PER_US:
384 max->desc.ramp_delay = 200000;
385 break;
386 }
387
388 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
389 control1 |= MAX8973_SNS_ENABLE;
390
391 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))
392 control1 |= MAX8973_NFSR_ENABLE;
393
394 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)
395 control1 |= MAX8973_AD_ENABLE;
396
397 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {
398 control1 |= MAX8973_BIAS_ENABLE;
399 max->desc.enable_time = 20;
400 } else {
401 max->desc.enable_time = 240;
402 }
403
404 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
405 control1 |= MAX8973_FREQSHIFT_9PER;
406
407 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) &&
408 (max->id == MAX77621))
409 control2 |= MAX77621_T_JUNCTION_120;
410
411 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
412 control2 |= MAX8973_DISCH_ENBABLE;
413
414 /* Clock advance trip configuration */
415 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {
416 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:
417 control2 |= MAX8973_CKKADV_TRIP_DISABLE;
418 break;
419
420 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:
421 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;
422 break;
423
424 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:
425 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;
426 break;
427
428 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:
429 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;
430 break;
431 }
432
433 /* Configure inductor value */
434 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {
435 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:
436 control2 |= MAX8973_INDUCTOR_NOMINAL;
437 break;
438
439 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:
440 control2 |= MAX8973_INDUCTOR_MIN_30_PER;
441 break;
442
443 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:
444 control2 |= MAX8973_INDUCTOR_PLUS_30_PER;
445 break;
446
447 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:
448 control2 |= MAX8973_INDUCTOR_PLUS_60_PER;
449 break;
450 }
451
452 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);
453 if (ret < 0) {
454 dev_err(max->dev, "register %d write failed, err = %d",
455 MAX8973_CONTROL1, ret);
456 return ret;
457 }
458
459 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
460 if (ret < 0) {
461 dev_err(max->dev, "register %d write failed, err = %d",
462 MAX8973_CONTROL2, ret);
463 return ret;
464 }
465
466 /* If external control is enabled then disable EN bit */
467 if (max->enable_external_control && (max->id == MAX8973)) {
468 ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
469 MAX8973_VOUT_ENABLE, 0);
470 if (ret < 0)
471 dev_err(max->dev, "register %d update failed, err = %d",
472 MAX8973_VOUT, ret);
473 }
474 return ret;
475 }
476
477 static int max8973_thermal_read_temp(void *data, int *temp)
478 {
479 struct max8973_chip *mchip = data;
480 unsigned int val;
481 int ret;
482
483 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val);
484 if (ret < 0) {
485 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret);
486 return ret;
487 }
488
489 /* +1 degC to trigger cool devive */
490 if (val & MAX77621_CHIPID_TJINT_S)
491 *temp = mchip->junction_temp_warning + 1000;
492 else
493 *temp = MAX77621_NORMAL_OPERATING_TEMP;
494
495 return 0;
496 }
497
498 static irqreturn_t max8973_thermal_irq(int irq, void *data)
499 {
500 struct max8973_chip *mchip = data;
501
502 thermal_zone_device_update(mchip->tz_device);
503
504 return IRQ_HANDLED;
505 }
506
507 static const struct thermal_zone_of_device_ops max77621_tz_ops = {
508 .get_temp = max8973_thermal_read_temp,
509 };
510
511 static int max8973_thermal_init(struct max8973_chip *mchip)
512 {
513 struct thermal_zone_device *tzd;
514 struct irq_data *irq_data;
515 unsigned long irq_flags = 0;
516 int ret;
517
518 if (mchip->id != MAX77621)
519 return 0;
520
521 tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip,
522 &max77621_tz_ops);
523 if (IS_ERR(tzd)) {
524 ret = PTR_ERR(tzd);
525 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n",
526 ret);
527 return ret;
528 }
529
530 if (mchip->irq <= 0)
531 return 0;
532
533 irq_data = irq_get_irq_data(mchip->irq);
534 if (irq_data)
535 irq_flags = irqd_get_trigger_type(irq_data);
536
537 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL,
538 max8973_thermal_irq,
539 IRQF_ONESHOT | IRQF_SHARED | irq_flags,
540 dev_name(mchip->dev), mchip);
541 if (ret < 0) {
542 dev_err(mchip->dev, "Failed to request irq %d, %d\n",
543 mchip->irq, ret);
544 return ret;
545 }
546
547 return 0;
548 }
549
550 static const struct regmap_config max8973_regmap_config = {
551 .reg_bits = 8,
552 .val_bits = 8,
553 .max_register = MAX8973_CHIPID2,
554 .cache_type = REGCACHE_RBTREE,
555 };
556
557 static struct max8973_regulator_platform_data *max8973_parse_dt(
558 struct device *dev)
559 {
560 struct max8973_regulator_platform_data *pdata;
561 struct device_node *np = dev->of_node;
562 int ret;
563 u32 pval;
564 bool etr_enable;
565 bool etr_sensitivity_high;
566
567 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
568 if (!pdata)
569 return NULL;
570
571 pdata->enable_ext_control = of_property_read_bool(np,
572 "maxim,externally-enable");
573 pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0);
574 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);
575
576 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
577 if (!ret)
578 pdata->dvs_def_state = pval;
579
580 if (of_property_read_bool(np, "maxim,enable-remote-sense"))
581 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;
582
583 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))
584 pdata->control_flags |=
585 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;
586
587 if (of_property_read_bool(np, "maxim,enable-active-discharge"))
588 pdata->control_flags |=
589 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;
590
591 if (of_property_read_bool(np, "maxim,enable-frequency-shift"))
592 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;
593
594 if (of_property_read_bool(np, "maxim,enable-bias-control"))
595 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE;
596
597 etr_enable = of_property_read_bool(np, "maxim,enable-etr");
598 etr_sensitivity_high = of_property_read_bool(np,
599 "maxim,enable-high-etr-sensitivity");
600 if (etr_sensitivity_high)
601 etr_enable = true;
602
603 if (etr_enable) {
604 if (etr_sensitivity_high)
605 pdata->control_flags |=
606 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;
607 else
608 pdata->control_flags |=
609 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;
610 } else {
611 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;
612 }
613
614 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140;
615 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval);
616 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120))
617 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120;
618
619 return pdata;
620 }
621
622 static const struct of_device_id of_max8973_match_tbl[] = {
623 { .compatible = "maxim,max8973", .data = (void *)MAX8973, },
624 { .compatible = "maxim,max77621", .data = (void *)MAX77621, },
625 { },
626 };
627 MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
628
629 static int max8973_probe(struct i2c_client *client,
630 const struct i2c_device_id *id)
631 {
632 struct max8973_regulator_platform_data *pdata;
633 struct regulator_init_data *ridata;
634 struct regulator_config config = { };
635 struct regulator_dev *rdev;
636 struct max8973_chip *max;
637 bool pdata_from_dt = false;
638 unsigned int chip_id;
639 int ret;
640
641 pdata = dev_get_platdata(&client->dev);
642
643 if (!pdata && client->dev.of_node) {
644 pdata = max8973_parse_dt(&client->dev);
645 pdata_from_dt = true;
646 }
647
648 if (!pdata) {
649 dev_err(&client->dev, "No Platform data");
650 return -EIO;
651 }
652
653 if ((pdata->dvs_gpio == -EPROBE_DEFER) ||
654 (pdata->enable_gpio == -EPROBE_DEFER))
655 return -EPROBE_DEFER;
656
657 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
658 if (!max)
659 return -ENOMEM;
660
661 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
662 if (IS_ERR(max->regmap)) {
663 ret = PTR_ERR(max->regmap);
664 dev_err(&client->dev, "regmap init failed, err %d\n", ret);
665 return ret;
666 }
667
668 if (client->dev.of_node) {
669 const struct of_device_id *match;
670
671 match = of_match_device(of_match_ptr(of_max8973_match_tbl),
672 &client->dev);
673 if (!match)
674 return -ENODATA;
675 max->id = (u32)((uintptr_t)match->data);
676 } else {
677 max->id = id->driver_data;
678 }
679
680 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);
681 if (ret < 0) {
682 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);
683 return ret;
684 }
685
686 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",
687 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);
688
689 i2c_set_clientdata(client, max);
690 max->ops = max8973_dcdc_ops;
691 max->dev = &client->dev;
692 max->desc.name = id->name;
693 max->desc.id = 0;
694 max->desc.ops = &max->ops;
695 max->desc.type = REGULATOR_VOLTAGE;
696 max->desc.owner = THIS_MODULE;
697 max->desc.min_uV = MAX8973_MIN_VOLATGE;
698 max->desc.uV_step = MAX8973_VOLATGE_STEP;
699 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
700
701 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
702 max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL;
703 max->enable_external_control = pdata->enable_ext_control;
704 max->curr_gpio_val = pdata->dvs_def_state;
705 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
706 max->junction_temp_warning = pdata->junction_temp_warning;
707
708 if (gpio_is_valid(max->enable_gpio))
709 max->enable_external_control = true;
710
711 max->lru_index[0] = max->curr_vout_reg;
712
713 if (gpio_is_valid(max->dvs_gpio)) {
714 int gpio_flags;
715 int i;
716
717 gpio_flags = (pdata->dvs_def_state) ?
718 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
719 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
720 gpio_flags, "max8973-dvs");
721 if (ret) {
722 dev_err(&client->dev,
723 "gpio_request for gpio %d failed, err = %d\n",
724 max->dvs_gpio, ret);
725 return ret;
726 }
727
728 /*
729 * Initialize the lru index with vout_reg id
730 * The index 0 will be most recently used and
731 * set with the max->curr_vout_reg */
732 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
733 max->lru_index[i] = i;
734 max->lru_index[0] = max->curr_vout_reg;
735 max->lru_index[max->curr_vout_reg] = 0;
736 } else {
737 /*
738 * If there is no DVS GPIO, the VOUT register
739 * address is fixed.
740 */
741 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap;
742 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap;
743 max->desc.vsel_reg = max->curr_vout_reg;
744 max->desc.vsel_mask = MAX8973_VOUT_MASK;
745 }
746
747 if (pdata_from_dt)
748 pdata->reg_init_data = of_get_regulator_init_data(&client->dev,
749 client->dev.of_node, &max->desc);
750
751 ridata = pdata->reg_init_data;
752 switch (max->id) {
753 case MAX8973:
754 if (!pdata->enable_ext_control) {
755 max->desc.enable_reg = MAX8973_VOUT;
756 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
757 max->ops.enable = regulator_enable_regmap;
758 max->ops.disable = regulator_disable_regmap;
759 max->ops.is_enabled = regulator_is_enabled_regmap;
760 break;
761 }
762
763 if (gpio_is_valid(max->enable_gpio)) {
764 config.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
765 if (ridata && (ridata->constraints.always_on ||
766 ridata->constraints.boot_on))
767 config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
768 config.ena_gpio = max->enable_gpio;
769 }
770 break;
771
772 case MAX77621:
773 if (gpio_is_valid(max->enable_gpio)) {
774 ret = devm_gpio_request_one(&client->dev,
775 max->enable_gpio, GPIOF_OUT_INIT_HIGH,
776 "max8973-en-gpio");
777 if (ret) {
778 dev_err(&client->dev,
779 "gpio_request for gpio %d failed: %d\n",
780 max->enable_gpio, ret);
781 return ret;
782 }
783 }
784
785 max->desc.enable_reg = MAX8973_VOUT;
786 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
787 max->ops.enable = regulator_enable_regmap;
788 max->ops.disable = regulator_disable_regmap;
789 max->ops.is_enabled = regulator_is_enabled_regmap;
790 max->ops.set_current_limit = max8973_set_current_limit;
791 max->ops.get_current_limit = max8973_get_current_limit;
792 break;
793 default:
794 break;
795 }
796
797 ret = max8973_init_dcdc(max, pdata);
798 if (ret < 0) {
799 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
800 return ret;
801 }
802
803 config.dev = &client->dev;
804 config.init_data = pdata->reg_init_data;
805 config.driver_data = max;
806 config.of_node = client->dev.of_node;
807 config.regmap = max->regmap;
808
809 /* Register the regulators */
810 rdev = devm_regulator_register(&client->dev, &max->desc, &config);
811 if (IS_ERR(rdev)) {
812 ret = PTR_ERR(rdev);
813 dev_err(max->dev, "regulator register failed, err %d\n", ret);
814 return ret;
815 }
816
817 max8973_thermal_init(max);
818 return 0;
819 }
820
821 static const struct i2c_device_id max8973_id[] = {
822 {.name = "max8973", .driver_data = MAX8973},
823 {.name = "max77621", .driver_data = MAX77621},
824 {},
825 };
826 MODULE_DEVICE_TABLE(i2c, max8973_id);
827
828 static struct i2c_driver max8973_i2c_driver = {
829 .driver = {
830 .name = "max8973",
831 .of_match_table = of_max8973_match_tbl,
832 },
833 .probe = max8973_probe,
834 .id_table = max8973_id,
835 };
836
837 static int __init max8973_init(void)
838 {
839 return i2c_add_driver(&max8973_i2c_driver);
840 }
841 subsys_initcall(max8973_init);
842
843 static void __exit max8973_cleanup(void)
844 {
845 i2c_del_driver(&max8973_i2c_driver);
846 }
847 module_exit(max8973_cleanup);
848
849 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
850 MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
851 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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