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[deliverable/linux.git] / drivers / regulator / max8973-regulator.c
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5928f538
LD		 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>
42dc3023 29#include <linux/of.h>
0f7d6ece 30#include <linux/of_device.h>
5928f538
LD		 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>
42dc3023 35#include <linux/regulator/of_regulator.h>
5928f538 36#include <linux/gpio.h>
c2ffa973 37#include <linux/of_gpio.h>
5928f538
LD		 38#include <linux/i2c.h>
39#include <linux/slab.h>
40#include <linux/regmap.h>
41
42/* Register definitions */
43#define MAX8973_VOUT 0x0
44#define MAX8973_VOUT_DVS 0x1
45#define MAX8973_CONTROL1 0x2
46#define MAX8973_CONTROL2 0x3
47#define MAX8973_CHIPID1 0x4
48#define MAX8973_CHIPID2 0x5
49
50#define MAX8973_MAX_VOUT_REG 2
51
52/* MAX8973_VOUT */
53#define MAX8973_VOUT_ENABLE BIT(7)
54#define MAX8973_VOUT_MASK 0x7F
55
56/* MAX8973_VOUT_DVS */
57#define MAX8973_DVS_VOUT_MASK 0x7F
58
59/* MAX8973_CONTROL1 */
60#define MAX8973_SNS_ENABLE BIT(7)
61#define MAX8973_FPWM_EN_M BIT(6)
62#define MAX8973_NFSR_ENABLE BIT(5)
63#define MAX8973_AD_ENABLE BIT(4)
64#define MAX8973_BIAS_ENABLE BIT(3)
65#define MAX8973_FREQSHIFT_9PER BIT(2)
66
67#define MAX8973_RAMP_12mV_PER_US 0x0
68#define MAX8973_RAMP_25mV_PER_US 0x1
69#define MAX8973_RAMP_50mV_PER_US 0x2
70#define MAX8973_RAMP_200mV_PER_US 0x3
3064c1f3 71#define MAX8973_RAMP_MASK 0x3
5928f538
LD		 72
73/* MAX8973_CONTROL2 */
74#define MAX8973_WDTMR_ENABLE BIT(6)
75#define MAX8973_DISCH_ENBABLE BIT(5)
76#define MAX8973_FT_ENABLE BIT(4)
77
78#define MAX8973_CKKADV_TRIP_DISABLE 0xC
79#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0
80#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4
81#define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8
82#define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000
83
84#define MAX8973_INDUCTOR_MIN_30_PER 0x0
85#define MAX8973_INDUCTOR_NOMINAL 0x1
86#define MAX8973_INDUCTOR_PLUS_30_PER 0x2
87#define MAX8973_INDUCTOR_PLUS_60_PER 0x3
88#define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000
89
90#define MAX8973_MIN_VOLATGE 606250
91#define MAX8973_MAX_VOLATGE 1400000
92#define MAX8973_VOLATGE_STEP 6250
93#define MAX8973_BUCK_N_VOLTAGE 0x80
94
0f7d6ece
LD		 95enum device_id {
96 MAX8973,
97 MAX77621
98};
99
5928f538
LD		 100/* Maxim 8973 chip information */
101struct max8973_chip {
102 struct device *dev;
103 struct regulator_desc desc;
5928f538
LD		 104 struct regmap *regmap;
105 bool enable_external_control;
69eb0980 106 int enable_gpio;
5928f538
LD		 107 int dvs_gpio;
108 int lru_index[MAX8973_MAX_VOUT_REG];
109 int curr_vout_val[MAX8973_MAX_VOUT_REG];
110 int curr_vout_reg;
111 int curr_gpio_val;
db892ff6 112 struct regulator_ops ops;
0f7d6ece 113 enum device_id id;
5928f538
LD		 114};
115
116/*
117 * find_voltage_set_register: Find new voltage configuration register (VOUT).
118 * The finding of the new VOUT register will be based on the LRU mechanism.
119 * Each VOUT register will have different voltage configured . This
120 * Function will look if any of the VOUT register have requested voltage set
121 * or not.
122 * - If it is already there then it will make that register as most
123 * recently used and return as found so that caller need not to set
124 * the VOUT register but need to set the proper gpios to select this
125 * VOUT register.
126 * - If requested voltage is not found then it will use the least
127 * recently mechanism to get new VOUT register for new configuration
128 * and will return not_found so that caller need to set new VOUT
129 * register and then gpios (both).
130 */
131static bool find_voltage_set_register(struct max8973_chip *tps,
132 int req_vsel, int *vout_reg, int *gpio_val)
133{
134 int i;
135 bool found = false;
136 int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1];
137 int found_index = MAX8973_MAX_VOUT_REG - 1;
138
139 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) {
140 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) {
141 new_vout_reg = tps->lru_index[i];
142 found_index = i;
143 found = true;
144 goto update_lru_index;
145 }
146 }
147
148update_lru_index:
149 for (i = found_index; i > 0; i--)
150 tps->lru_index[i] = tps->lru_index[i - 1];
151
152 tps->lru_index[0] = new_vout_reg;
153 *gpio_val = new_vout_reg;
154 *vout_reg = MAX8973_VOUT + new_vout_reg;
155 return found;
156}
157
158static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev)
159{
160 struct max8973_chip *max = rdev_get_drvdata(rdev);
161 unsigned int data;
162 int ret;
163
164 ret = regmap_read(max->regmap, max->curr_vout_reg, &data);
165 if (ret < 0) {
166 dev_err(max->dev, "register %d read failed, err = %d\n",
167 max->curr_vout_reg, ret);
168 return ret;
169 }
170 return data & MAX8973_VOUT_MASK;
171}
172
173static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev,
174 unsigned vsel)
175{
176 struct max8973_chip *max = rdev_get_drvdata(rdev);
177 int ret;
178 bool found = false;
179 int vout_reg = max->curr_vout_reg;
180 int gpio_val = max->curr_gpio_val;
181
182 /*
183 * If gpios are available to select the VOUT register then least
184 * recently used register for new configuration.
185 */
fa5f509f 186 if (gpio_is_valid(max->dvs_gpio))
5928f538
LD		 187 found = find_voltage_set_register(max, vsel,
188 &vout_reg, &gpio_val);
189
190 if (!found) {
191 ret = regmap_update_bits(max->regmap, vout_reg,
192 MAX8973_VOUT_MASK, vsel);
193 if (ret < 0) {
194 dev_err(max->dev, "register %d update failed, err %d\n",
195 vout_reg, ret);
196 return ret;
197 }
198 max->curr_vout_reg = vout_reg;
199 max->curr_vout_val[gpio_val] = vsel;
200 }
201
202 /* Select proper VOUT register vio gpios */
fa5f509f 203 if (gpio_is_valid(max->dvs_gpio)) {
5928f538
LD		 204 gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1);
205 max->curr_gpio_val = gpio_val;
206 }
207 return 0;
208}
209
210static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
211{
212 struct max8973_chip *max = rdev_get_drvdata(rdev);
213 int ret;
214 int pwm;
215
216 /* Enable force PWM mode in FAST mode only. */
217 switch (mode) {
218 case REGULATOR_MODE_FAST:
219 pwm = MAX8973_FPWM_EN_M;
220 break;
221
222 case REGULATOR_MODE_NORMAL:
223 pwm = 0;
224 break;
225
226 default:
227 return -EINVAL;
228 }
229
230 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
231 MAX8973_FPWM_EN_M, pwm);
232 if (ret < 0)
233 dev_err(max->dev, "register %d update failed, err %d\n",
234 MAX8973_CONTROL1, ret);
235 return ret;
236}
237
238static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)
239{
240 struct max8973_chip *max = rdev_get_drvdata(rdev);
241 unsigned int data;
242 int ret;
243
244 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
245 if (ret < 0) {
246 dev_err(max->dev, "register %d read failed, err %d\n",
247 MAX8973_CONTROL1, ret);
248 return ret;
249 }
250 return (data & MAX8973_FPWM_EN_M) ?
251 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
252}
253
3064c1f3
LD		 254static int max8973_set_ramp_delay(struct regulator_dev *rdev,
255 int ramp_delay)
256{
257 struct max8973_chip *max = rdev_get_drvdata(rdev);
258 unsigned int control;
259 int ret;
260 int ret_val;
261
262 /* Set ramp delay */
263 if (ramp_delay < 25000) {
264 control = MAX8973_RAMP_12mV_PER_US;
265 ret_val = 12000;
266 } else if (ramp_delay < 50000) {
267 control = MAX8973_RAMP_25mV_PER_US;
268 ret_val = 25000;
269 } else if (ramp_delay < 200000) {
270 control = MAX8973_RAMP_50mV_PER_US;
271 ret_val = 50000;
272 } else {
273 control = MAX8973_RAMP_200mV_PER_US;
274 ret_val = 200000;
275 }
276
277 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
278 MAX8973_RAMP_MASK, control);
279 if (ret < 0)
280 dev_err(max->dev, "register %d update failed, %d",
281 MAX8973_CONTROL1, ret);
282 return ret;
283}
284
db892ff6 285static const struct regulator_ops max8973_dcdc_ops = {
5928f538
LD		 286 .get_voltage_sel = max8973_dcdc_get_voltage_sel,
287 .set_voltage_sel = max8973_dcdc_set_voltage_sel,
288 .list_voltage = regulator_list_voltage_linear,
289 .set_mode = max8973_dcdc_set_mode,
290 .get_mode = max8973_dcdc_get_mode,
3064c1f3
LD		 291 .set_voltage_time_sel = regulator_set_voltage_time_sel,
292 .set_ramp_delay = max8973_set_ramp_delay,
5928f538
LD		 293};
294
3d68dfe3
GKH		 295static int max8973_init_dcdc(struct max8973_chip *max,
296 struct max8973_regulator_platform_data *pdata)
5928f538
LD		 297{
298 int ret;
299 uint8_t control1 = 0;
300 uint8_t control2 = 0;
3064c1f3
LD		 301 unsigned int data;
302
303 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
304 if (ret < 0) {
305 dev_err(max->dev, "register %d read failed, err = %d",
306 MAX8973_CONTROL1, ret);
307 return ret;
308 }
309 control1 = data & MAX8973_RAMP_MASK;
310 switch (control1) {
311 case MAX8973_RAMP_12mV_PER_US:
312 max->desc.ramp_delay = 12000;
313 break;
314 case MAX8973_RAMP_25mV_PER_US:
366604ec 315 max->desc.ramp_delay = 25000;
3064c1f3
LD		 316 break;
317 case MAX8973_RAMP_50mV_PER_US:
318 max->desc.ramp_delay = 50000;
319 break;
320 case MAX8973_RAMP_200mV_PER_US:
321 max->desc.ramp_delay = 200000;
322 break;
323 }
5928f538
LD		 324
325 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
326 control1 |= MAX8973_SNS_ENABLE;
327
328 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))
329 control1 |= MAX8973_NFSR_ENABLE;
330
331 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)
332 control1 |= MAX8973_AD_ENABLE;
333
dcd9ec6a 334 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {
5928f538 335 control1 |= MAX8973_BIAS_ENABLE;
dcd9ec6a
LD		 336 max->desc.enable_time = 20;
337 } else {
338 max->desc.enable_time = 240;
339 }
5928f538
LD		 340
341 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
342 control1 |= MAX8973_FREQSHIFT_9PER;
343
5928f538
LD		 344 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
345 control2 |= MAX8973_DISCH_ENBABLE;
346
347 /* Clock advance trip configuration */
348 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {
349 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:
350 control2 |= MAX8973_CKKADV_TRIP_DISABLE;
351 break;
352
353 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:
354 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;
355 break;
356
357 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:
358 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;
359 break;
360
361 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:
362 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;
363 break;
364 }
365
366 /* Configure inductor value */
367 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {
368 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:
369 control2 |= MAX8973_INDUCTOR_NOMINAL;
370 break;
371
372 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:
373 control2 |= MAX8973_INDUCTOR_MIN_30_PER;
374 break;
375
376 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:
377 control2 |= MAX8973_INDUCTOR_PLUS_30_PER;
378 break;
379
380 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:
381 control2 |= MAX8973_INDUCTOR_PLUS_60_PER;
382 break;
383 }
384
385 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);
386 if (ret < 0) {
387 dev_err(max->dev, "register %d write failed, err = %d",
388 MAX8973_CONTROL1, ret);
389 return ret;
390 }
391
392 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
393 if (ret < 0) {
394 dev_err(max->dev, "register %d write failed, err = %d",
395 MAX8973_CONTROL2, ret);
396 return ret;
397 }
398
399 /* If external control is enabled then disable EN bit */
0f7d6ece 400 if (max->enable_external_control && (max->id == MAX8973)) {
5928f538
LD		 401 ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
402 MAX8973_VOUT_ENABLE, 0);
403 if (ret < 0)
404 dev_err(max->dev, "register %d update failed, err = %d",
405 MAX8973_VOUT, ret);
406 }
407 return ret;
408}
409
410static const struct regmap_config max8973_regmap_config = {
411 .reg_bits = 8,
412 .val_bits = 8,
413 .max_register = MAX8973_CHIPID2,
414 .cache_type = REGCACHE_RBTREE,
415};
416
c2ffa973
LD		 417static struct max8973_regulator_platform_data *max8973_parse_dt(
418 struct device *dev)
419{
420 struct max8973_regulator_platform_data *pdata;
421 struct device_node *np = dev->of_node;
422 int ret;
423 u32 pval;
424
425 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
426 if (!pdata)
427 return NULL;
428
429 pdata->enable_ext_control = of_property_read_bool(np,
430 "maxim,externally-enable");
69eb0980 431 pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0);
c2ffa973
LD		 432 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);
433
434 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
435 if (!ret)
436 pdata->dvs_def_state = pval;
437
438 if (of_property_read_bool(np, "maxim,enable-remote-sense"))
439 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;
440
441 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))
442 pdata->control_flags |=
443 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;
444
445 if (of_property_read_bool(np, "maxim,enable-active-discharge"))
446 pdata->control_flags |=
447 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;
448
449 if (of_property_read_bool(np, "maxim,enable-frequency-shift"))
450 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;
451
452 if (of_property_read_bool(np, "maxim,enable-bias-control"))
453 pdata->control_flags |= MAX8973_BIAS_ENABLE;
454
455 return pdata;
456}
457
0f7d6ece
LD		 458static const struct of_device_id of_max8973_match_tbl[] = {
459 { .compatible = "maxim,max8973", .data = (void *)MAX8973, },
460 { .compatible = "maxim,max77621", .data = (void *)MAX77621, },
461 { },
462};
463MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
464
3d68dfe3
GKH		 465static int max8973_probe(struct i2c_client *client,
466 const struct i2c_device_id *id)
5928f538
LD		 467{
468 struct max8973_regulator_platform_data *pdata;
69eb0980 469 struct regulator_init_data *ridata;
5928f538
LD		 470 struct regulator_config config = { };
471 struct regulator_dev *rdev;
472 struct max8973_chip *max;
c2ffa973 473 bool pdata_from_dt = false;
0f7d6ece 474 unsigned int chip_id;
5928f538
LD		 475 int ret;
476
dff91d0b 477 pdata = dev_get_platdata(&client->dev);
42dc3023 478
c2ffa973
LD		 479 if (!pdata && client->dev.of_node) {
480 pdata = max8973_parse_dt(&client->dev);
481 pdata_from_dt = true;
482 }
483
484 if (!pdata) {
5928f538
LD		 485 dev_err(&client->dev, "No Platform data");
486 return -EIO;
487 }
488
69eb0980
LD		 489 if ((pdata->dvs_gpio == -EPROBE_DEFER) ||
490 (pdata->enable_gpio == -EPROBE_DEFER))
c2ffa973
LD		 491 return -EPROBE_DEFER;
492
5928f538 493 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
21024dee 494 if (!max)
5928f538 495 return -ENOMEM;
5928f538
LD		 496
497 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
498 if (IS_ERR(max->regmap)) {
499 ret = PTR_ERR(max->regmap);
500 dev_err(&client->dev, "regmap init failed, err %d\n", ret);
501 return ret;
502 }
503
0f7d6ece
LD		 504 if (client->dev.of_node) {
505 const struct of_device_id *match;
506
507 match = of_match_device(of_match_ptr(of_max8973_match_tbl),
508 &client->dev);
509 if (!match)
510 return -ENODATA;
511 max->id = (u32)((uintptr_t)match->data);
512 } else {
513 max->id = id->driver_data;
514 }
515
516 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);
517 if (ret < 0) {
518 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);
519 return ret;
520 }
521
522 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",
523 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);
524
5928f538 525 i2c_set_clientdata(client, max);
db892ff6 526 max->ops = max8973_dcdc_ops;
5928f538
LD		 527 max->dev = &client->dev;
528 max->desc.name = id->name;
529 max->desc.id = 0;
db892ff6 530 max->desc.ops = &max->ops;
5928f538
LD		 531 max->desc.type = REGULATOR_VOLTAGE;
532 max->desc.owner = THIS_MODULE;
533 max->desc.min_uV = MAX8973_MIN_VOLATGE;
534 max->desc.uV_step = MAX8973_VOLATGE_STEP;
535 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
536
69eb0980
LD		 537 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
538 max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL;
539 max->enable_external_control = pdata->enable_ext_control;
540 max->curr_gpio_val = pdata->dvs_def_state;
541 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
542
543 if (gpio_is_valid(max->enable_gpio))
544 max->enable_external_control = true;
545
5928f538 546 max->lru_index[0] = max->curr_vout_reg;
5928f538
LD		 547
548 if (gpio_is_valid(max->dvs_gpio)) {
549 int gpio_flags;
550 int i;
551
552 gpio_flags = (pdata->dvs_def_state) ?
553 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
554 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
555 gpio_flags, "max8973-dvs");
556 if (ret) {
557 dev_err(&client->dev,
558 "gpio_request for gpio %d failed, err = %d\n",
559 max->dvs_gpio, ret);
560 return ret;
561 }
5928f538
LD		 562
563 /*
564 * Initialize the lru index with vout_reg id
565 * The index 0 will be most recently used and
566 * set with the max->curr_vout_reg */
567 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
568 max->lru_index[i] = i;
569 max->lru_index[0] = max->curr_vout_reg;
570 max->lru_index[max->curr_vout_reg] = 0;
571 }
572
c2ffa973
LD		 573 if (pdata_from_dt)
574 pdata->reg_init_data = of_get_regulator_init_data(&client->dev,
575 client->dev.of_node, &max->desc);
576
0f7d6ece
LD		 577 ridata = pdata->reg_init_data;
578 switch (max->id) {
579 case MAX8973:
580 if (!pdata->enable_ext_control) {
581 max->desc.enable_reg = MAX8973_VOUT;
582 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
583 max->ops.enable = regulator_enable_regmap;
584 max->ops.disable = regulator_disable_regmap;
585 max->ops.is_enabled = regulator_is_enabled_regmap;
586 break;
587 }
588
589 if (gpio_is_valid(max->enable_gpio)) {
590 config.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
591 if (ridata && (ridata->constraints.always_on ||
592 ridata->constraints.boot_on))
593 config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
594 config.ena_gpio = max->enable_gpio;
595 }
596 break;
597
598 case MAX77621:
599 if (gpio_is_valid(max->enable_gpio)) {
600 ret = devm_gpio_request_one(&client->dev,
601 max->enable_gpio, GPIOF_OUT_INIT_HIGH,
602 "max8973-en-gpio");
603 if (ret) {
604 dev_err(&client->dev,
605 "gpio_request for gpio %d failed: %d\n",
606 max->enable_gpio, ret);
607 return ret;
608 }
609 }
610
611 max->desc.enable_reg = MAX8973_VOUT;
612 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
613 max->ops.enable = regulator_enable_regmap;
614 max->ops.disable = regulator_disable_regmap;
615 max->ops.is_enabled = regulator_is_enabled_regmap;
616 break;
617 default:
618 break;
619 }
620
c2ffa973
LD		 621 ret = max8973_init_dcdc(max, pdata);
622 if (ret < 0) {
623 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
624 return ret;
5928f538
LD		 625 }
626
627 config.dev = &client->dev;
c2ffa973 628 config.init_data = pdata->reg_init_data;
5928f538
LD		 629 config.driver_data = max;
630 config.of_node = client->dev.of_node;
631 config.regmap = max->regmap;
632
633 /* Register the regulators */
8d581fd0 634 rdev = devm_regulator_register(&client->dev, &max->desc, &config);
5928f538
LD		 635 if (IS_ERR(rdev)) {
636 ret = PTR_ERR(rdev);
637 dev_err(max->dev, "regulator register failed, err %d\n", ret);
638 return ret;
639 }
640
5928f538
LD		 641 return 0;
642}
643
5928f538 644static const struct i2c_device_id max8973_id[] = {
0f7d6ece
LD		 645 {.name = "max8973", .driver_data = MAX8973},
646 {.name = "max77621", .driver_data = MAX77621},
5928f538
LD		 647 {},
648};
5928f538
LD		 649MODULE_DEVICE_TABLE(i2c, max8973_id);
650
651static struct i2c_driver max8973_i2c_driver = {
652 .driver = {
653 .name = "max8973",
0f7d6ece 654 .of_match_table = of_max8973_match_tbl,
5928f538
LD		 655 .owner = THIS_MODULE,
656 },
657 .probe = max8973_probe,
5928f538
LD		 658 .id_table = max8973_id,
659};
660
661static int __init max8973_init(void)
662{
663 return i2c_add_driver(&max8973_i2c_driver);
664}
665subsys_initcall(max8973_init);
666
667static void __exit max8973_cleanup(void)
668{
669 i2c_del_driver(&max8973_i2c_driver);
670}
671module_exit(max8973_cleanup);
672
673MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
674MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
675MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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