summaryrefslogtreecommitdiff
path: root/drivers/regulator/max17135-regulator.c
blob: 5ea70ef5868f79d529274acbf46ebce85e1473ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
/*
 * Copyright (C) 2010-2012 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/max17135.h>
#include <linux/gpio.h>

/*
 * Regulator definitions
 *   *_MIN_uV  - minimum microvolt for regulator
 *   *_MAX_uV  - maximum microvolt for regulator
 *   *_STEP_uV - microvolts between regulator output levels
 *   *_MIN_VAL - minimum register field value for regulator
 *   *_MAX_VAL - maximum register field value for regulator
 */
#define MAX17135_HVINP_MIN_uV    5000000
#define MAX17135_HVINP_MAX_uV   20000000
#define MAX17135_HVINP_STEP_uV   1000000
#define MAX17135_HVINP_MIN_VAL         0
#define MAX17135_HVINP_MAX_VAL         1

#define MAX17135_HVINN_MIN_uV    5000000
#define MAX17135_HVINN_MAX_uV   20000000
#define MAX17135_HVINN_STEP_uV   1000000
#define MAX17135_HVINN_MIN_VAL         0
#define MAX17135_HVINN_MAX_VAL         1

#define MAX17135_GVDD_MIN_uV    5000000
#define MAX17135_GVDD_MAX_uV   20000000
#define MAX17135_GVDD_STEP_uV   1000000
#define MAX17135_GVDD_MIN_VAL         0
#define MAX17135_GVDD_MAX_VAL         1

#define MAX17135_GVEE_MIN_uV    5000000
#define MAX17135_GVEE_MAX_uV   20000000
#define MAX17135_GVEE_STEP_uV   1000000
#define MAX17135_GVEE_MIN_VAL         0
#define MAX17135_GVEE_MAX_VAL         1

#define MAX17135_VCOM_MIN_VAL         0
#define MAX17135_VCOM_MAX_VAL       255

#define MAX17135_VNEG_MIN_uV    5000000
#define MAX17135_VNEG_MAX_uV   20000000
#define MAX17135_VNEG_STEP_uV   1000000
#define MAX17135_VNEG_MIN_VAL         0
#define MAX17135_VNEG_MAX_VAL         1

#define MAX17135_VPOS_MIN_uV    5000000
#define MAX17135_VPOS_MAX_uV   20000000
#define MAX17135_VPOS_STEP_uV   1000000
#define MAX17135_VPOS_MIN_VAL         0
#define MAX17135_VPOS_MAX_VAL         1

struct max17135_vcom_programming_data {
	int vcom_min_uV;
	int vcom_max_uV;
	int vcom_step_uV;
};

static long unsigned int max17135_pass_num = { 1 };
static int max17135_vcom = { -1250000 };

struct max17135_vcom_programming_data vcom_data[2] = {
	{
		-4325000,
		-500000,
		15000,
	},
	{
		-3050000,
		-500000,
		10000,
	},
};

static int max17135_is_power_good(struct max17135 *max17135);

/*
 * Regulator operations
 */
static int max17135_hvinp_set_voltage(struct regulator_dev *reg,
					int minuV, int uV, unsigned *selector)
{
	unsigned int reg_val;
	unsigned int fld_val;

	if ((uV >= MAX17135_HVINP_MIN_uV) &&
	    (uV <= MAX17135_HVINP_MAX_uV))
		fld_val = (uV - MAX17135_HVINP_MIN_uV) /
			MAX17135_HVINP_STEP_uV;
	else
		return -EINVAL;

	max17135_reg_read(REG_MAX17135_HVINP, &reg_val);

	reg_val &= ~BITFMASK(HVINP);
	reg_val |= BITFVAL(HVINP, fld_val); /* shift to correct bit */

	return max17135_reg_write(REG_MAX17135_HVINP, reg_val);
}

static int max17135_hvinp_get_voltage(struct regulator_dev *reg)
{
	unsigned int reg_val;
	unsigned int fld_val;
	int volt;

	max17135_reg_read(REG_MAX17135_HVINP, &reg_val);

	fld_val = (reg_val & BITFMASK(HVINP)) >> HVINP_LSH;

	if ((fld_val >= MAX17135_HVINP_MIN_VAL) &&
		(fld_val <= MAX17135_HVINP_MAX_VAL)) {
		volt = (fld_val * MAX17135_HVINP_STEP_uV) +
			MAX17135_HVINP_MIN_uV;
	} else {
		printk(KERN_ERR "MAX17135: HVINP voltage is out of range\n");
		volt = 0;
	}
	return volt;
}

static int max17135_hvinp_enable(struct regulator_dev *reg)
{
	return 0;
}

static int max17135_hvinp_disable(struct regulator_dev *reg)
{
	return 0;
}

/* Convert uV to the VCOM register bitfield setting */
static inline int vcom_uV_to_rs(int uV, int pass_num)
{
	return (vcom_data[pass_num].vcom_max_uV - uV)
		/ vcom_data[pass_num].vcom_step_uV;
}

/* Convert the VCOM register bitfield setting to uV */
static inline int vcom_rs_to_uV(int rs, int pass_num)
{
	return vcom_data[pass_num].vcom_max_uV
		- (vcom_data[pass_num].vcom_step_uV * rs);
}

static int max17135_vcom_set_voltage(struct regulator_dev *reg,
					int minuV, int uV, unsigned *selector)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);
	unsigned int reg_val;
	int vcom_read;

	if ((uV < vcom_data[max17135->pass_num-1].vcom_min_uV)
		|| (uV > vcom_data[max17135->pass_num-1].vcom_max_uV))
		return -EINVAL;

	max17135_reg_read(REG_MAX17135_DVR, &reg_val);

	/*
	 * Only program VCOM if it is not set to the desired value.
	 * Programming VCOM excessively degrades ability to keep
	 * DVR register value persistent.
	 */
	vcom_read = vcom_rs_to_uV(reg_val, max17135->pass_num-1);
	if (vcom_read != max17135->vcom_uV) {
		reg_val &= ~BITFMASK(DVR);
		reg_val |= BITFVAL(DVR, vcom_uV_to_rs(uV,
			max17135->pass_num-1));
		max17135_reg_write(REG_MAX17135_DVR, reg_val);

		reg_val = BITFVAL(CTRL_DVR, true); /* shift to correct bit */
		return max17135_reg_write(REG_MAX17135_PRGM_CTRL, reg_val);
	}

	return 0;
}

static int max17135_vcom_get_voltage(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);
	unsigned int reg_val;

	max17135_reg_read(REG_MAX17135_DVR, &reg_val);
	return vcom_rs_to_uV(BITFEXT(reg_val, DVR), max17135->pass_num-1);
}

static int max17135_vcom_enable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	/*
	 * Check to see if we need to set the VCOM voltage.
	 * Should only be done one time. And, we can
	 * only change vcom voltage if we have been enabled.
	 */
	if (!max17135->vcom_setup && max17135_is_power_good(max17135)) {
		max17135_vcom_set_voltage(reg,
			max17135->vcom_uV,
			max17135->vcom_uV,
			NULL);
		max17135->vcom_setup = true;
	}

	/* enable VCOM regulator output */
	if (max17135->pass_num == 1)
		gpio_set_value(max17135->gpio_pmic_vcom_ctrl, 1);
	else {
		unsigned int reg_val;

		max17135_reg_read(REG_MAX17135_ENABLE, &reg_val);
		reg_val &= ~BITFMASK(VCOM_ENABLE);
		reg_val |= BITFVAL(VCOM_ENABLE, 1); /* shift to correct bit */
		max17135_reg_write(REG_MAX17135_ENABLE, reg_val);
	}

	return 0;
}

static int max17135_vcom_disable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	if (max17135->pass_num == 1)
		gpio_set_value(max17135->gpio_pmic_vcom_ctrl, 0);
	else {
		unsigned int reg_val;

		max17135_reg_read(REG_MAX17135_ENABLE, &reg_val);
		reg_val &= ~BITFMASK(VCOM_ENABLE);
		max17135_reg_write(REG_MAX17135_ENABLE, reg_val);
	}

	return 0;
}

static int max17135_vcom_is_enabled(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	/* read VCOM regulator enable setting */
	if (max17135->pass_num == 1) {
		int gpio = gpio_get_value(max17135->gpio_pmic_vcom_ctrl);
		if (gpio == 0)
			return 0;
		else
			return 1;
	} else {
		unsigned int reg_val;

		max17135_reg_read(REG_MAX17135_ENABLE, &reg_val);
		reg_val &= BITFMASK(VCOM_ENABLE);
		if (reg_val != 0)
			return 1;
		else
			return 0;
	}
}

static int max17135_is_power_good(struct max17135 *max17135)
{
    unsigned int reg_val;
    unsigned int fld_val;

    max17135_reg_read(REG_MAX17135_FAULT, &reg_val);
    fld_val = (reg_val & BITFMASK(FAULT_POK)) >> FAULT_POK_LSH;

    /* Check the POK bit */
    return fld_val;
}

static int max17135_wait_power_good(struct max17135 *max17135)
{
	int i;

	for (i = 0; i < max17135->max_wait * 3; i++) {
		if (max17135_is_power_good(max17135))
			return 0;

		msleep(1);
	}

	return -ETIMEDOUT;
}

static int max17135_display_enable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	/* The Pass 1 parts cannot turn on the PMIC via I2C. */
	if (max17135->pass_num == 1)
		gpio_set_value(max17135->gpio_pmic_wakeup, 1);
	else {
		unsigned int reg_val;

		max17135_reg_read(REG_MAX17135_ENABLE, &reg_val);
		reg_val &= ~BITFMASK(ENABLE);
		reg_val |= BITFVAL(ENABLE, 1);
		max17135_reg_write(REG_MAX17135_ENABLE, reg_val);
	}

	return max17135_wait_power_good(max17135);
}

static int max17135_display_disable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	if (max17135->pass_num == 1)
		gpio_set_value(max17135->gpio_pmic_wakeup, 0);
	else {
		unsigned int reg_val;

		max17135_reg_read(REG_MAX17135_ENABLE, &reg_val);
		reg_val &= ~BITFMASK(ENABLE);
		max17135_reg_write(REG_MAX17135_ENABLE, reg_val);
	}

	msleep(max17135->max_wait);

	return 0;
}

static int max17135_display_is_enabled(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);
	int gpio = gpio_get_value(max17135->gpio_pmic_wakeup);

	if (gpio == 0)
		return 0;
	else
		return 1;
}

static int max17135_v3p3_enable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	gpio_set_value(max17135->gpio_pmic_v3p3, 1);
	return 0;
}

static int max17135_v3p3_disable(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);

	gpio_set_value(max17135->gpio_pmic_v3p3, 0);
	return 0;
}

static int max17135_v3p3_is_enabled(struct regulator_dev *reg)
{
	struct max17135 *max17135 = rdev_get_drvdata(reg);
	int gpio = gpio_get_value(max17135->gpio_pmic_v3p3);

	if (gpio == 0)
		return 0;
	else
		return 1;
}

/*
 * Regulator operations
 */

static struct regulator_ops max17135_display_ops = {
	.enable = max17135_display_enable,
	.disable = max17135_display_disable,
	.is_enabled = max17135_display_is_enabled,
};

static struct regulator_ops max17135_gvdd_ops = {
};

static struct regulator_ops max17135_gvee_ops = {
};

static struct regulator_ops max17135_hvinn_ops = {
};

static struct regulator_ops max17135_hvinp_ops = {
	.enable = max17135_hvinp_enable,
	.disable = max17135_hvinp_disable,
	.get_voltage = max17135_hvinp_get_voltage,
	.set_voltage = max17135_hvinp_set_voltage,
};

static struct regulator_ops max17135_vcom_ops = {
	.enable = max17135_vcom_enable,
	.disable = max17135_vcom_disable,
	.get_voltage = max17135_vcom_get_voltage,
	.set_voltage = max17135_vcom_set_voltage,
	.is_enabled = max17135_vcom_is_enabled,
};

static struct regulator_ops max17135_vneg_ops = {
};

static struct regulator_ops max17135_vpos_ops = {
};

static struct regulator_ops max17135_v3p3_ops = {
	.enable = max17135_v3p3_enable,
	.disable = max17135_v3p3_disable,
	.is_enabled = max17135_v3p3_is_enabled,
};


/*
 * Regulator descriptors
 */
static struct regulator_desc max17135_reg[MAX17135_NUM_REGULATORS] = {
{
	.name = "DISPLAY",
	.id = MAX17135_DISPLAY,
	.ops = &max17135_display_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "GVDD",
	.id = MAX17135_GVDD,
	.ops = &max17135_gvdd_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "GVEE",
	.id = MAX17135_GVEE,
	.ops = &max17135_gvee_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "HVINN",
	.id = MAX17135_HVINN,
	.ops = &max17135_hvinn_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "HVINP",
	.id = MAX17135_HVINP,
	.ops = &max17135_hvinp_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "VCOM",
	.id = MAX17135_VCOM,
	.ops = &max17135_vcom_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "VNEG",
	.id = MAX17135_VNEG,
	.ops = &max17135_vneg_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "VPOS",
	.id = MAX17135_VPOS,
	.ops = &max17135_vpos_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
{
	.name = "V3P3",
	.id = MAX17135_V3P3,
	.ops = &max17135_v3p3_ops,
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
},
};

static void max17135_setup_timings(struct max17135 *max17135)
{
	unsigned int reg_val;

	int timing1, timing2, timing3, timing4,
		timing5, timing6, timing7, timing8;

	max17135_reg_read(REG_MAX17135_TIMING1, &timing1);
	max17135_reg_read(REG_MAX17135_TIMING2, &timing2);
	max17135_reg_read(REG_MAX17135_TIMING3, &timing3);
	max17135_reg_read(REG_MAX17135_TIMING4, &timing4);
	max17135_reg_read(REG_MAX17135_TIMING5, &timing5);
	max17135_reg_read(REG_MAX17135_TIMING6, &timing6);
	max17135_reg_read(REG_MAX17135_TIMING7, &timing7);
	max17135_reg_read(REG_MAX17135_TIMING8, &timing8);

	if ((timing1 != max17135->gvee_pwrup) ||
		(timing2 != max17135->vneg_pwrup) ||
		(timing3 != max17135->vpos_pwrup) ||
		(timing4 != max17135->gvdd_pwrup) ||
		(timing5 != max17135->gvdd_pwrdn) ||
		(timing6 != max17135->vpos_pwrdn) ||
		(timing7 != max17135->vneg_pwrdn) ||
		(timing8 != max17135->gvee_pwrdn)) {
		max17135_reg_write(REG_MAX17135_TIMING1, max17135->gvee_pwrup);
		max17135_reg_write(REG_MAX17135_TIMING2, max17135->vneg_pwrup);
		max17135_reg_write(REG_MAX17135_TIMING3, max17135->vpos_pwrup);
		max17135_reg_write(REG_MAX17135_TIMING4, max17135->gvdd_pwrup);
		max17135_reg_write(REG_MAX17135_TIMING5, max17135->gvdd_pwrdn);
		max17135_reg_write(REG_MAX17135_TIMING6, max17135->vpos_pwrdn);
		max17135_reg_write(REG_MAX17135_TIMING7, max17135->vneg_pwrdn);
		max17135_reg_write(REG_MAX17135_TIMING8, max17135->gvee_pwrdn);

		reg_val = BITFVAL(CTRL_TIMING, true); /* shift to correct bit */
		max17135_reg_write(REG_MAX17135_PRGM_CTRL, reg_val);
	}
}


/*
 * Regulator init/probing/exit functions
 */
static int max17135_regulator_probe(struct platform_device *pdev)
{
	struct regulator_dev *rdev;

	rdev = regulator_register(&max17135_reg[pdev->id], &pdev->dev,
				  pdev->dev.platform_data,
				  dev_get_drvdata(&pdev->dev));

	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "failed to register %s\n",
			max17135_reg[pdev->id].name);
		return PTR_ERR(rdev);
	}

	return 0;
}

static int max17135_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	regulator_unregister(rdev);
	return 0;
}

static struct platform_driver max17135_regulator_driver = {
	.probe = max17135_regulator_probe,
	.remove = max17135_regulator_remove,
	.driver = {
		.name = "max17135-reg",
	},
};

int max17135_register_regulator(struct max17135 *max17135, int reg,
				     struct regulator_init_data *initdata)
{
	struct platform_device *pdev;
	int ret;

	struct i2c_client *client = max17135->i2c_client;
	/* If we can't find PMIC via I2C, we should not register regulators */
	if (i2c_smbus_read_byte_data(client,
		REG_MAX17135_PRODUCT_REV) != 0) {
		dev_err(max17135->dev,
			"Max17135 PMIC not found!\n");
		return -ENXIO;
	}

	if (max17135->pdev[reg])
		return -EBUSY;

	pdev = platform_device_alloc("max17135-reg", reg);
	if (!pdev)
		return -ENOMEM;

	max17135->pdev[reg] = pdev;

	initdata->driver_data = max17135;

	pdev->dev.platform_data = initdata;
	pdev->dev.parent = max17135->dev;
	platform_set_drvdata(pdev, max17135);

	ret = platform_device_add(pdev);

	if (ret != 0) {
		dev_err(max17135->dev,
		       "Failed to register regulator %d: %d\n",
			reg, ret);
		platform_device_del(pdev);
		max17135->pdev[reg] = NULL;
	}

	if (!max17135->init_done) {
		max17135->pass_num = max17135_pass_num;
		max17135->vcom_uV = max17135_vcom;

		/*
		 * Set up PMIC timing values.
		 * Should only be done one time!  Timing values may only be
		 * changed a limited number of times according to spec.
		 */
		max17135_setup_timings(max17135);

		max17135->init_done = true;
	}

	return ret;
}

static int __init max17135_regulator_init(void)
{
	return platform_driver_register(&max17135_regulator_driver);
}
subsys_initcall(max17135_regulator_init);

static void __exit max17135_regulator_exit(void)
{
	platform_driver_unregister(&max17135_regulator_driver);
}
module_exit(max17135_regulator_exit);


/*
 * Parse user specified options (`max17135:')
 * example:
 *   max17135:pass=2,vcom=-1250000
 */
static int __init max17135_setup(char *options)
{
	int ret;
	char *opt;
	while ((opt = strsep(&options, ",")) != NULL) {
		if (!*opt)
			continue;
		if (!strncmp(opt, "pass=", 5)) {
			ret = strict_strtoul(opt + 5, 0, &max17135_pass_num);
			if (ret < 0)
				return ret;
		}
		if (!strncmp(opt, "vcom=", 5)) {
			int offs = 5;
			if (opt[5] == '-')
				offs = 6;
			ret = strict_strtoul(opt + offs, 0,
				(long *)&max17135_vcom);
			if (ret < 0)
				return ret;
			max17135_vcom = -max17135_vcom;
		}
	}

	return 1;
}

__setup("max17135:", max17135_setup);

/* Module information */
MODULE_DESCRIPTION("MAX17135 regulator driver");
MODULE_LICENSE("GPL");