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/gpio/consumer.h>
38#include <linux/of_gpio.h>
39#include <linux/i2c.h>
40#include <linux/slab.h>
41#include <linux/regmap.h>
42#include <linux/thermal.h>
43#include <linux/irq.h>
44#include <linux/interrupt.h>
45
46/* Register definitions */
47#define MAX8973_VOUT 0x0
48#define MAX8973_VOUT_DVS 0x1
49#define MAX8973_CONTROL1 0x2
50#define MAX8973_CONTROL2 0x3
51#define MAX8973_CHIPID1 0x4
52#define MAX8973_CHIPID2 0x5
53
54#define MAX8973_MAX_VOUT_REG 2
55
56/* MAX8973_VOUT */
57#define MAX8973_VOUT_ENABLE BIT(7)
58#define MAX8973_VOUT_MASK 0x7F
59
60/* MAX8973_VOUT_DVS */
61#define MAX8973_DVS_VOUT_MASK 0x7F
62
63/* MAX8973_CONTROL1 */
64#define MAX8973_SNS_ENABLE BIT(7)
65#define MAX8973_FPWM_EN_M BIT(6)
66#define MAX8973_NFSR_ENABLE BIT(5)
67#define MAX8973_AD_ENABLE BIT(4)
68#define MAX8973_BIAS_ENABLE BIT(3)
69#define MAX8973_FREQSHIFT_9PER BIT(2)
70
71#define MAX8973_RAMP_12mV_PER_US 0x0
72#define MAX8973_RAMP_25mV_PER_US 0x1
73#define MAX8973_RAMP_50mV_PER_US 0x2
74#define MAX8973_RAMP_200mV_PER_US 0x3
75#define MAX8973_RAMP_MASK 0x3
76
77/* MAX8973_CONTROL2 */
78#define MAX8973_WDTMR_ENABLE BIT(6)
79#define MAX8973_DISCH_ENBABLE BIT(5)
80#define MAX8973_FT_ENABLE BIT(4)
81#define MAX77621_T_JUNCTION_120 BIT(7)
82
83#define MAX8973_CKKADV_TRIP_MASK 0xC
84#define MAX8973_CKKADV_TRIP_DISABLE 0xC
85#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0
86#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4
87#define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8
88#define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000
89
90#define MAX8973_INDUCTOR_MIN_30_PER 0x0
91#define MAX8973_INDUCTOR_NOMINAL 0x1
92#define MAX8973_INDUCTOR_PLUS_30_PER 0x2
93#define MAX8973_INDUCTOR_PLUS_60_PER 0x3
94#define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000
95
96#define MAX8973_MIN_VOLATGE 606250
97#define MAX8973_MAX_VOLATGE 1400000
98#define MAX8973_VOLATGE_STEP 6250
99#define MAX8973_BUCK_N_VOLTAGE 0x80
100
101#define MAX77621_CHIPID_TJINT_S BIT(0)
102
103#define MAX77621_NORMAL_OPERATING_TEMP 100000
104#define MAX77621_TJINT_WARNING_TEMP_120 120000
105#define MAX77621_TJINT_WARNING_TEMP_140 140000
106
107enum device_id {
108 MAX8973,
109 MAX77621
110};
111
112/* Maxim 8973 chip information */
113struct max8973_chip {
114 struct device *dev;
115 struct regulator_desc desc;
116 struct regmap *regmap;
117 bool enable_external_control;
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 */
145static 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
162update_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
172static 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
187static 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
224static 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
252static 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
268static 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
275 /* Set ramp delay */
276 if (ramp_delay <= 12000)
277 control = MAX8973_RAMP_12mV_PER_US;
278 else if (ramp_delay <= 25000)
279 control = MAX8973_RAMP_25mV_PER_US;
280 else if (ramp_delay <= 50000)
281 control = MAX8973_RAMP_50mV_PER_US;
282 else if (ramp_delay <= 200000)
283 control = MAX8973_RAMP_200mV_PER_US;
284 else
285 return -EINVAL;
286
287 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
288 MAX8973_RAMP_MASK, control);
289 if (ret < 0)
290 dev_err(max->dev, "register %d update failed, %d",
291 MAX8973_CONTROL1, ret);
292 return ret;
293}
294
295static int max8973_set_current_limit(struct regulator_dev *rdev,
296 int min_ua, int max_ua)
297{
298 struct max8973_chip *max = rdev_get_drvdata(rdev);
299 unsigned int val;
300 int ret;
301
302 if (max_ua <= 9000000)
303 val = MAX8973_CKKADV_TRIP_75mV_PER_US;
304 else if (max_ua <= 12000000)
305 val = MAX8973_CKKADV_TRIP_150mV_PER_US;
306 else
307 val = MAX8973_CKKADV_TRIP_DISABLE;
308
309 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,
310 MAX8973_CKKADV_TRIP_MASK, val);
311 if (ret < 0) {
312 dev_err(max->dev, "register %d update failed: %d\n",
313 MAX8973_CONTROL2, ret);
314 return ret;
315 }
316 return 0;
317}
318
319static int max8973_get_current_limit(struct regulator_dev *rdev)
320{
321 struct max8973_chip *max = rdev_get_drvdata(rdev);
322 unsigned int control2;
323 int ret;
324
325 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);
326 if (ret < 0) {
327 dev_err(max->dev, "register %d read failed: %d\n",
328 MAX8973_CONTROL2, ret);
329 return ret;
330 }
331 switch (control2 & MAX8973_CKKADV_TRIP_MASK) {
332 case MAX8973_CKKADV_TRIP_DISABLE:
333 return 15000000;
334 case MAX8973_CKKADV_TRIP_150mV_PER_US:
335 return 12000000;
336 case MAX8973_CKKADV_TRIP_75mV_PER_US:
337 return 9000000;
338 default:
339 break;
340 }
341 return 9000000;
342}
343
344static const struct regulator_ops max8973_dcdc_ops = {
345 .get_voltage_sel = max8973_dcdc_get_voltage_sel,
346 .set_voltage_sel = max8973_dcdc_set_voltage_sel,
347 .list_voltage = regulator_list_voltage_linear,
348 .set_mode = max8973_dcdc_set_mode,
349 .get_mode = max8973_dcdc_get_mode,
350 .set_voltage_time_sel = regulator_set_voltage_time_sel,
351 .set_ramp_delay = max8973_set_ramp_delay,
352};
353
354static int max8973_init_dcdc(struct max8973_chip *max,
355 struct max8973_regulator_platform_data *pdata)
356{
357 int ret;
358 uint8_t control1 = 0;
359 uint8_t control2 = 0;
360 unsigned int data;
361
362 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
363 if (ret < 0) {
364 dev_err(max->dev, "register %d read failed, err = %d",
365 MAX8973_CONTROL1, ret);
366 return ret;
367 }
368 control1 = data & MAX8973_RAMP_MASK;
369 switch (control1) {
370 case MAX8973_RAMP_12mV_PER_US:
371 max->desc.ramp_delay = 12000;
372 break;
373 case MAX8973_RAMP_25mV_PER_US:
374 max->desc.ramp_delay = 25000;
375 break;
376 case MAX8973_RAMP_50mV_PER_US:
377 max->desc.ramp_delay = 50000;
378 break;
379 case MAX8973_RAMP_200mV_PER_US:
380 max->desc.ramp_delay = 200000;
381 break;
382 }
383
384 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
385 control1 |= MAX8973_SNS_ENABLE;
386
387 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))
388 control1 |= MAX8973_NFSR_ENABLE;
389
390 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)
391 control1 |= MAX8973_AD_ENABLE;
392
393 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {
394 control1 |= MAX8973_BIAS_ENABLE;
395 max->desc.enable_time = 20;
396 } else {
397 max->desc.enable_time = 240;
398 }
399
400 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
401 control1 |= MAX8973_FREQSHIFT_9PER;
402
403 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) &&
404 (max->id == MAX77621))
405 control2 |= MAX77621_T_JUNCTION_120;
406
407 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
408 control2 |= MAX8973_DISCH_ENBABLE;
409
410 /* Clock advance trip configuration */
411 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {
412 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:
413 control2 |= MAX8973_CKKADV_TRIP_DISABLE;
414 break;
415
416 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:
417 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;
418 break;
419
420 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:
421 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;
422 break;
423
424 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:
425 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;
426 break;
427 }
428
429 /* Configure inductor value */
430 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {
431 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:
432 control2 |= MAX8973_INDUCTOR_NOMINAL;
433 break;
434
435 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:
436 control2 |= MAX8973_INDUCTOR_MIN_30_PER;
437 break;
438
439 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:
440 control2 |= MAX8973_INDUCTOR_PLUS_30_PER;
441 break;
442
443 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:
444 control2 |= MAX8973_INDUCTOR_PLUS_60_PER;
445 break;
446 }
447
448 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);
449 if (ret < 0) {
450 dev_err(max->dev, "register %d write failed, err = %d",
451 MAX8973_CONTROL1, ret);
452 return ret;
453 }
454
455 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
456 if (ret < 0) {
457 dev_err(max->dev, "register %d write failed, err = %d",
458 MAX8973_CONTROL2, ret);
459 return ret;
460 }
461
462 /* If external control is enabled then disable EN bit */
463 if (max->enable_external_control && (max->id == MAX8973)) {
464 ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
465 MAX8973_VOUT_ENABLE, 0);
466 if (ret < 0)
467 dev_err(max->dev, "register %d update failed, err = %d",
468 MAX8973_VOUT, ret);
469 }
470 return ret;
471}
472
473static int max8973_thermal_read_temp(void *data, int *temp)
474{
475 struct max8973_chip *mchip = data;
476 unsigned int val;
477 int ret;
478
479 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val);
480 if (ret < 0) {
481 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret);
482 return ret;
483 }
484
485 /* +1 degC to trigger cool devive */
486 if (val & MAX77621_CHIPID_TJINT_S)
487 *temp = mchip->junction_temp_warning + 1000;
488 else
489 *temp = MAX77621_NORMAL_OPERATING_TEMP;
490
491 return 0;
492}
493
494static irqreturn_t max8973_thermal_irq(int irq, void *data)
495{
496 struct max8973_chip *mchip = data;
497
498 thermal_zone_device_update(mchip->tz_device,
499 THERMAL_EVENT_UNSPECIFIED);
500
501 return IRQ_HANDLED;
502}
503
504static const struct thermal_zone_of_device_ops max77621_tz_ops = {
505 .get_temp = max8973_thermal_read_temp,
506};
507
508static int max8973_thermal_init(struct max8973_chip *mchip)
509{
510 struct thermal_zone_device *tzd;
511 struct irq_data *irq_data;
512 unsigned long irq_flags = 0;
513 int ret;
514
515 if (mchip->id != MAX77621)
516 return 0;
517
518 tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip,
519 &max77621_tz_ops);
520 if (IS_ERR(tzd)) {
521 ret = PTR_ERR(tzd);
522 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n",
523 ret);
524 return ret;
525 }
526
527 if (mchip->irq <= 0)
528 return 0;
529
530 irq_data = irq_get_irq_data(mchip->irq);
531 if (irq_data)
532 irq_flags = irqd_get_trigger_type(irq_data);
533
534 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL,
535 max8973_thermal_irq,
536 IRQF_ONESHOT | IRQF_SHARED | irq_flags,
537 dev_name(mchip->dev), mchip);
538 if (ret < 0) {
539 dev_err(mchip->dev, "Failed to request irq %d, %d\n",
540 mchip->irq, ret);
541 return ret;
542 }
543
544 return 0;
545}
546
547static const struct regmap_config max8973_regmap_config = {
548 .reg_bits = 8,
549 .val_bits = 8,
550 .max_register = MAX8973_CHIPID2,
551 .cache_type = REGCACHE_RBTREE,
552};
553
554static struct max8973_regulator_platform_data *max8973_parse_dt(
555 struct device *dev)
556{
557 struct max8973_regulator_platform_data *pdata;
558 struct device_node *np = dev->of_node;
559 int ret;
560 u32 pval;
561 bool etr_enable;
562 bool etr_sensitivity_high;
563
564 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
565 if (!pdata)
566 return NULL;
567
568 pdata->enable_ext_control = of_property_read_bool(np,
569 "maxim,externally-enable");
570 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);
571
572 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
573 if (!ret)
574 pdata->dvs_def_state = pval;
575
576 if (of_property_read_bool(np, "maxim,enable-remote-sense"))
577 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;
578
579 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))
580 pdata->control_flags |=
581 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;
582
583 if (of_property_read_bool(np, "maxim,enable-active-discharge"))
584 pdata->control_flags |=
585 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;
586
587 if (of_property_read_bool(np, "maxim,enable-frequency-shift"))
588 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;
589
590 if (of_property_read_bool(np, "maxim,enable-bias-control"))
591 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE;
592
593 etr_enable = of_property_read_bool(np, "maxim,enable-etr");
594 etr_sensitivity_high = of_property_read_bool(np,
595 "maxim,enable-high-etr-sensitivity");
596 if (etr_sensitivity_high)
597 etr_enable = true;
598
599 if (etr_enable) {
600 if (etr_sensitivity_high)
601 pdata->control_flags |=
602 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;
603 else
604 pdata->control_flags |=
605 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;
606 } else {
607 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;
608 }
609
610 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140;
611 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval);
612 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120))
613 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120;
614
615 return pdata;
616}
617
618static const struct of_device_id of_max8973_match_tbl[] = {
619 { .compatible = "maxim,max8973", .data = (void *)MAX8973, },
620 { .compatible = "maxim,max77621", .data = (void *)MAX77621, },
621 { },
622};
623MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
624
625static int max8973_probe(struct i2c_client *client,
626 const struct i2c_device_id *id)
627{
628 struct max8973_regulator_platform_data *pdata;
629 struct regulator_init_data *ridata;
630 struct regulator_config config = { };
631 struct regulator_dev *rdev;
632 struct max8973_chip *max;
633 bool pdata_from_dt = false;
634 unsigned int chip_id;
635 struct gpio_desc *gpiod;
636 enum gpiod_flags gflags;
637 int ret;
638
639 pdata = dev_get_platdata(&client->dev);
640
641 if (!pdata && client->dev.of_node) {
642 pdata = max8973_parse_dt(&client->dev);
643 pdata_from_dt = true;
644 }
645
646 if (!pdata) {
647 dev_err(&client->dev, "No Platform data");
648 return -EIO;
649 }
650
651 if (pdata->dvs_gpio == -EPROBE_DEFER)
652 return -EPROBE_DEFER;
653
654 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
655 if (!max)
656 return -ENOMEM;
657
658 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
659 if (IS_ERR(max->regmap)) {
660 ret = PTR_ERR(max->regmap);
661 dev_err(&client->dev, "regmap init failed, err %d\n", ret);
662 return ret;
663 }
664
665 if (client->dev.of_node) {
666 const struct of_device_id *match;
667
668 match = of_match_device(of_match_ptr(of_max8973_match_tbl),
669 &client->dev);
670 if (!match)
671 return -ENODATA;
672 max->id = (u32)((uintptr_t)match->data);
673 } else {
674 max->id = id->driver_data;
675 }
676
677 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);
678 if (ret < 0) {
679 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);
680 return ret;
681 }
682
683 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",
684 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);
685
686 i2c_set_clientdata(client, max);
687 max->ops = max8973_dcdc_ops;
688 max->dev = &client->dev;
689 max->desc.name = id->name;
690 max->desc.id = 0;
691 max->desc.ops = &max->ops;
692 max->desc.type = REGULATOR_VOLTAGE;
693 max->desc.owner = THIS_MODULE;
694 max->desc.min_uV = MAX8973_MIN_VOLATGE;
695 max->desc.uV_step = MAX8973_VOLATGE_STEP;
696 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
697
698 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
699 max->enable_external_control = pdata->enable_ext_control;
700 max->curr_gpio_val = pdata->dvs_def_state;
701 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
702 max->junction_temp_warning = pdata->junction_temp_warning;
703
704 max->lru_index[0] = max->curr_vout_reg;
705
706 if (gpio_is_valid(max->dvs_gpio)) {
707 int gpio_flags;
708 int i;
709
710 gpio_flags = (pdata->dvs_def_state) ?
711 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
712 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
713 gpio_flags, "max8973-dvs");
714 if (ret) {
715 dev_err(&client->dev,
716 "gpio_request for gpio %d failed, err = %d\n",
717 max->dvs_gpio, ret);
718 return ret;
719 }
720
721 /*
722 * Initialize the lru index with vout_reg id
723 * The index 0 will be most recently used and
724 * set with the max->curr_vout_reg */
725 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
726 max->lru_index[i] = i;
727 max->lru_index[0] = max->curr_vout_reg;
728 max->lru_index[max->curr_vout_reg] = 0;
729 } else {
730 /*
731 * If there is no DVS GPIO, the VOUT register
732 * address is fixed.
733 */
734 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap;
735 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap;
736 max->desc.vsel_reg = max->curr_vout_reg;
737 max->desc.vsel_mask = MAX8973_VOUT_MASK;
738 }
739
740 if (pdata_from_dt)
741 pdata->reg_init_data = of_get_regulator_init_data(&client->dev,
742 client->dev.of_node, &max->desc);
743
744 ridata = pdata->reg_init_data;
745 switch (max->id) {
746 case MAX8973:
747 if (!pdata->enable_ext_control) {
748 max->desc.enable_reg = MAX8973_VOUT;
749 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
750 max->ops.enable = regulator_enable_regmap;
751 max->ops.disable = regulator_disable_regmap;
752 max->ops.is_enabled = regulator_is_enabled_regmap;
753 break;
754 }
755
756 if (ridata && (ridata->constraints.always_on ||
757 ridata->constraints.boot_on))
758 gflags = GPIOD_OUT_HIGH;
759 else
760 gflags = GPIOD_OUT_LOW;
761 gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
762 gpiod = devm_gpiod_get_optional(&client->dev,
763 "maxim,enable",
764 gflags);
765 if (IS_ERR(gpiod))
766 return PTR_ERR(gpiod);
767 if (gpiod) {
768 config.ena_gpiod = gpiod;
769 max->enable_external_control = true;
770 }
771
772 break;
773
774 case MAX77621:
775 /*
776 * We do not let the core switch this regulator on/off,
777 * we just leave it on.
778 */
779 gpiod = devm_gpiod_get_optional(&client->dev,
780 "maxim,enable",
781 GPIOD_OUT_HIGH);
782 if (IS_ERR(gpiod))
783 return PTR_ERR(gpiod);
784 if (gpiod)
785 max->enable_external_control = true;
786
787 max->desc.enable_reg = MAX8973_VOUT;
788 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
789 max->ops.enable = regulator_enable_regmap;
790 max->ops.disable = regulator_disable_regmap;
791 max->ops.is_enabled = regulator_is_enabled_regmap;
792 max->ops.set_current_limit = max8973_set_current_limit;
793 max->ops.get_current_limit = max8973_get_current_limit;
794 break;
795 default:
796 break;
797 }
798
799 ret = max8973_init_dcdc(max, pdata);
800 if (ret < 0) {
801 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
802 return ret;
803 }
804
805 config.dev = &client->dev;
806 config.init_data = pdata->reg_init_data;
807 config.driver_data = max;
808 config.of_node = client->dev.of_node;
809 config.regmap = max->regmap;
810
811 /*
812 * Register the regulators
813 * Turn the GPIO descriptor over to the regulator core for
814 * lifecycle management if we pass an ena_gpiod.
815 */
816 if (config.ena_gpiod)
817 devm_gpiod_unhinge(&client->dev, config.ena_gpiod);
818 rdev = devm_regulator_register(&client->dev, &max->desc, &config);
819 if (IS_ERR(rdev)) {
820 ret = PTR_ERR(rdev);
821 dev_err(max->dev, "regulator register failed, err %d\n", ret);
822 return ret;
823 }
824
825 max8973_thermal_init(max);
826 return 0;
827}
828
829static const struct i2c_device_id max8973_id[] = {
830 {.name = "max8973", .driver_data = MAX8973},
831 {.name = "max77621", .driver_data = MAX77621},
832 {},
833};
834MODULE_DEVICE_TABLE(i2c, max8973_id);
835
836static struct i2c_driver max8973_i2c_driver = {
837 .driver = {
838 .name = "max8973",
839 .of_match_table = of_max8973_match_tbl,
840 },
841 .probe = max8973_probe,
842 .id_table = max8973_id,
843};
844
845static int __init max8973_init(void)
846{
847 return i2c_add_driver(&max8973_i2c_driver);
848}
849subsys_initcall(max8973_init);
850
851static void __exit max8973_cleanup(void)
852{
853 i2c_del_driver(&max8973_i2c_driver);
854}
855module_exit(max8973_cleanup);
856
857MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
858MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
859MODULE_LICENSE("GPL v2");
860