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1// SPDX-License-Identifier: GPL-2.0
2//
3// FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
4//
5// Supported Part Numbers:
6// FAN53555UC00X/01X/03X/04X/05X
7//
8// Copyright (c) 2012 Marvell Technology Ltd.
9// Yunfan Zhang <yfzhang@marvell.com>
10
11#include <linux/module.h>
12#include <linux/param.h>
13#include <linux/err.h>
14#include <linux/platform_device.h>
15#include <linux/regulator/driver.h>
16#include <linux/regulator/machine.h>
17#include <linux/regulator/of_regulator.h>
18#include <linux/of_device.h>
19#include <linux/i2c.h>
20#include <linux/slab.h>
21#include <linux/regmap.h>
22#include <linux/regulator/fan53555.h>
23
24/* Voltage setting */
25#define FAN53555_VSEL0 0x00
26#define FAN53555_VSEL1 0x01
27/* Control register */
28#define FAN53555_CONTROL 0x02
29/* IC Type */
30#define FAN53555_ID1 0x03
31/* IC mask version */
32#define FAN53555_ID2 0x04
33/* Monitor register */
34#define FAN53555_MONITOR 0x05
35
36/* VSEL bit definitions */
37#define VSEL_BUCK_EN (1 << 7)
38#define VSEL_MODE (1 << 6)
39/* Chip ID and Verison */
40#define DIE_ID 0x0F /* ID1 */
41#define DIE_REV 0x0F /* ID2 */
42/* Control bit definitions */
43#define CTL_OUTPUT_DISCHG (1 << 7)
44#define CTL_SLEW_MASK (0x7 << 4)
45#define CTL_SLEW_SHIFT 4
46#define CTL_RESET (1 << 2)
47#define CTL_MODE_VSEL0_MODE BIT(0)
48#define CTL_MODE_VSEL1_MODE BIT(1)
49
50#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
51#define FAN53526_NVOLTAGES 128
52
53enum fan53555_vendor {
54 FAN53526_VENDOR_FAIRCHILD = 0,
55 FAN53555_VENDOR_FAIRCHILD,
56 FAN53555_VENDOR_SILERGY,
57};
58
59enum {
60 FAN53526_CHIP_ID_01 = 1,
61};
62
63enum {
64 FAN53526_CHIP_REV_08 = 8,
65};
66
67/* IC Type */
68enum {
69 FAN53555_CHIP_ID_00 = 0,
70 FAN53555_CHIP_ID_01,
71 FAN53555_CHIP_ID_02,
72 FAN53555_CHIP_ID_03,
73 FAN53555_CHIP_ID_04,
74 FAN53555_CHIP_ID_05,
75 FAN53555_CHIP_ID_08 = 8,
76};
77
78/* IC mask revision */
79enum {
80 FAN53555_CHIP_REV_00 = 0x3,
81 FAN53555_CHIP_REV_13 = 0xf,
82};
83
84enum {
85 SILERGY_SYR82X = 8,
86 SILERGY_SYR83X = 9,
87};
88
89struct fan53555_device_info {
90 enum fan53555_vendor vendor;
91 struct device *dev;
92 struct regulator_desc desc;
93 struct regulator_init_data *regulator;
94 /* IC Type and Rev */
95 int chip_id;
96 int chip_rev;
97 /* Voltage setting register */
98 unsigned int vol_reg;
99 unsigned int sleep_reg;
100 /* Voltage range and step(linear) */
101 unsigned int vsel_min;
102 unsigned int vsel_step;
103 unsigned int vsel_count;
104 /* Mode */
105 unsigned int mode_reg;
106 unsigned int mode_mask;
107 /* Sleep voltage cache */
108 unsigned int sleep_vol_cache;
109};
110
111static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
112{
113 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
114 int ret;
115
116 if (di->sleep_vol_cache == uV)
117 return 0;
118 ret = regulator_map_voltage_linear(rdev, uV, uV);
119 if (ret < 0)
120 return ret;
121 ret = regmap_update_bits(rdev->regmap, di->sleep_reg,
122 di->desc.vsel_mask, ret);
123 if (ret < 0)
124 return ret;
125 /* Cache the sleep voltage setting.
126 * Might not be the real voltage which is rounded */
127 di->sleep_vol_cache = uV;
128
129 return 0;
130}
131
132static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
133{
134 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
135
136 return regmap_update_bits(rdev->regmap, di->sleep_reg,
137 VSEL_BUCK_EN, VSEL_BUCK_EN);
138}
139
140static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
141{
142 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
143
144 return regmap_update_bits(rdev->regmap, di->sleep_reg,
145 VSEL_BUCK_EN, 0);
146}
147
148static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
149{
150 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
151
152 switch (mode) {
153 case REGULATOR_MODE_FAST:
154 regmap_update_bits(rdev->regmap, di->mode_reg,
155 di->mode_mask, di->mode_mask);
156 break;
157 case REGULATOR_MODE_NORMAL:
158 regmap_update_bits(rdev->regmap, di->vol_reg, di->mode_mask, 0);
159 break;
160 default:
161 return -EINVAL;
162 }
163 return 0;
164}
165
166static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
167{
168 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
169 unsigned int val;
170 int ret = 0;
171
172 ret = regmap_read(rdev->regmap, di->mode_reg, &val);
173 if (ret < 0)
174 return ret;
175 if (val & di->mode_mask)
176 return REGULATOR_MODE_FAST;
177 else
178 return REGULATOR_MODE_NORMAL;
179}
180
181static const int slew_rates[] = {
182 64000,
183 32000,
184 16000,
185 8000,
186 4000,
187 2000,
188 1000,
189 500,
190};
191
192static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
193{
194 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
195 int regval = -1, i;
196
197 for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
198 if (ramp <= slew_rates[i])
199 regval = i;
200 else
201 break;
202 }
203
204 if (regval < 0) {
205 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
206 return -EINVAL;
207 }
208
209 return regmap_update_bits(rdev->regmap, FAN53555_CONTROL,
210 CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
211}
212
213static const struct regulator_ops fan53555_regulator_ops = {
214 .set_voltage_sel = regulator_set_voltage_sel_regmap,
215 .get_voltage_sel = regulator_get_voltage_sel_regmap,
216 .set_voltage_time_sel = regulator_set_voltage_time_sel,
217 .map_voltage = regulator_map_voltage_linear,
218 .list_voltage = regulator_list_voltage_linear,
219 .set_suspend_voltage = fan53555_set_suspend_voltage,
220 .enable = regulator_enable_regmap,
221 .disable = regulator_disable_regmap,
222 .is_enabled = regulator_is_enabled_regmap,
223 .set_mode = fan53555_set_mode,
224 .get_mode = fan53555_get_mode,
225 .set_ramp_delay = fan53555_set_ramp,
226 .set_suspend_enable = fan53555_set_suspend_enable,
227 .set_suspend_disable = fan53555_set_suspend_disable,
228};
229
230static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
231{
232 /* Init voltage range and step */
233 switch (di->chip_id) {
234 case FAN53526_CHIP_ID_01:
235 switch (di->chip_rev) {
236 case FAN53526_CHIP_REV_08:
237 di->vsel_min = 600000;
238 di->vsel_step = 6250;
239 break;
240 default:
241 dev_err(di->dev,
242 "Chip ID %d with rev %d not supported!\n",
243 di->chip_id, di->chip_rev);
244 return -EINVAL;
245 }
246 break;
247 default:
248 dev_err(di->dev,
249 "Chip ID %d not supported!\n", di->chip_id);
250 return -EINVAL;
251 }
252
253 di->vsel_count = FAN53526_NVOLTAGES;
254
255 return 0;
256}
257
258static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
259{
260 /* Init voltage range and step */
261 switch (di->chip_id) {
262 case FAN53555_CHIP_ID_00:
263 switch (di->chip_rev) {
264 case FAN53555_CHIP_REV_00:
265 di->vsel_min = 600000;
266 di->vsel_step = 10000;
267 break;
268 case FAN53555_CHIP_REV_13:
269 di->vsel_min = 800000;
270 di->vsel_step = 10000;
271 break;
272 default:
273 dev_err(di->dev,
274 "Chip ID %d with rev %d not supported!\n",
275 di->chip_id, di->chip_rev);
276 return -EINVAL;
277 }
278 break;
279 case FAN53555_CHIP_ID_01:
280 case FAN53555_CHIP_ID_03:
281 case FAN53555_CHIP_ID_05:
282 case FAN53555_CHIP_ID_08:
283 di->vsel_min = 600000;
284 di->vsel_step = 10000;
285 break;
286 case FAN53555_CHIP_ID_04:
287 di->vsel_min = 603000;
288 di->vsel_step = 12826;
289 break;
290 default:
291 dev_err(di->dev,
292 "Chip ID %d not supported!\n", di->chip_id);
293 return -EINVAL;
294 }
295
296 di->vsel_count = FAN53555_NVOLTAGES;
297
298 return 0;
299}
300
301static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
302{
303 /* Init voltage range and step */
304 switch (di->chip_id) {
305 case SILERGY_SYR82X:
306 case SILERGY_SYR83X:
307 di->vsel_min = 712500;
308 di->vsel_step = 12500;
309 break;
310 default:
311 dev_err(di->dev,
312 "Chip ID %d not supported!\n", di->chip_id);
313 return -EINVAL;
314 }
315
316 di->vsel_count = FAN53555_NVOLTAGES;
317
318 return 0;
319}
320
321/* For 00,01,03,05 options:
322 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
323 * For 04 option:
324 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
325 * */
326static int fan53555_device_setup(struct fan53555_device_info *di,
327 struct fan53555_platform_data *pdata)
328{
329 int ret = 0;
330
331 /* Setup voltage control register */
332 switch (pdata->sleep_vsel_id) {
333 case FAN53555_VSEL_ID_0:
334 di->sleep_reg = FAN53555_VSEL0;
335 di->vol_reg = FAN53555_VSEL1;
336 break;
337 case FAN53555_VSEL_ID_1:
338 di->sleep_reg = FAN53555_VSEL1;
339 di->vol_reg = FAN53555_VSEL0;
340 break;
341 default:
342 dev_err(di->dev, "Invalid VSEL ID!\n");
343 return -EINVAL;
344 }
345
346 /* Setup mode control register */
347 switch (di->vendor) {
348 case FAN53526_VENDOR_FAIRCHILD:
349 di->mode_reg = FAN53555_CONTROL;
350
351 switch (pdata->sleep_vsel_id) {
352 case FAN53555_VSEL_ID_0:
353 di->mode_mask = CTL_MODE_VSEL1_MODE;
354 break;
355 case FAN53555_VSEL_ID_1:
356 di->mode_mask = CTL_MODE_VSEL0_MODE;
357 break;
358 }
359 break;
360 case FAN53555_VENDOR_FAIRCHILD:
361 case FAN53555_VENDOR_SILERGY:
362 di->mode_reg = di->vol_reg;
363 di->mode_mask = VSEL_MODE;
364 break;
365 default:
366 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
367 return -EINVAL;
368 }
369
370 /* Setup voltage range */
371 switch (di->vendor) {
372 case FAN53526_VENDOR_FAIRCHILD:
373 ret = fan53526_voltages_setup_fairchild(di);
374 break;
375 case FAN53555_VENDOR_FAIRCHILD:
376 ret = fan53555_voltages_setup_fairchild(di);
377 break;
378 case FAN53555_VENDOR_SILERGY:
379 ret = fan53555_voltages_setup_silergy(di);
380 break;
381 default:
382 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
383 return -EINVAL;
384 }
385
386 return ret;
387}
388
389static int fan53555_regulator_register(struct fan53555_device_info *di,
390 struct regulator_config *config)
391{
392 struct regulator_desc *rdesc = &di->desc;
393 struct regulator_dev *rdev;
394
395 rdesc->name = "fan53555-reg";
396 rdesc->supply_name = "vin";
397 rdesc->ops = &fan53555_regulator_ops;
398 rdesc->type = REGULATOR_VOLTAGE;
399 rdesc->n_voltages = di->vsel_count;
400 rdesc->enable_reg = di->vol_reg;
401 rdesc->enable_mask = VSEL_BUCK_EN;
402 rdesc->min_uV = di->vsel_min;
403 rdesc->uV_step = di->vsel_step;
404 rdesc->vsel_reg = di->vol_reg;
405 rdesc->vsel_mask = di->vsel_count - 1;
406 rdesc->owner = THIS_MODULE;
407
408 rdev = devm_regulator_register(di->dev, &di->desc, config);
409 return PTR_ERR_OR_ZERO(rdev);
410}
411
412static const struct regmap_config fan53555_regmap_config = {
413 .reg_bits = 8,
414 .val_bits = 8,
415};
416
417static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
418 struct device_node *np,
419 const struct regulator_desc *desc)
420{
421 struct fan53555_platform_data *pdata;
422 int ret;
423 u32 tmp;
424
425 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
426 if (!pdata)
427 return NULL;
428
429 pdata->regulator = of_get_regulator_init_data(dev, np, desc);
430
431 ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
432 &tmp);
433 if (!ret)
434 pdata->sleep_vsel_id = tmp;
435
436 return pdata;
437}
438
439static const struct of_device_id fan53555_dt_ids[] = {
440 {
441 .compatible = "fcs,fan53526",
442 .data = (void *)FAN53526_VENDOR_FAIRCHILD,
443 }, {
444 .compatible = "fcs,fan53555",
445 .data = (void *)FAN53555_VENDOR_FAIRCHILD
446 }, {
447 .compatible = "silergy,syr827",
448 .data = (void *)FAN53555_VENDOR_SILERGY,
449 }, {
450 .compatible = "silergy,syr828",
451 .data = (void *)FAN53555_VENDOR_SILERGY,
452 },
453 { }
454};
455MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
456
457static int fan53555_regulator_probe(struct i2c_client *client,
458 const struct i2c_device_id *id)
459{
460 struct device_node *np = client->dev.of_node;
461 struct fan53555_device_info *di;
462 struct fan53555_platform_data *pdata;
463 struct regulator_config config = { };
464 struct regmap *regmap;
465 unsigned int val;
466 int ret;
467
468 di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
469 GFP_KERNEL);
470 if (!di)
471 return -ENOMEM;
472
473 pdata = dev_get_platdata(&client->dev);
474 if (!pdata)
475 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
476
477 if (!pdata || !pdata->regulator) {
478 dev_err(&client->dev, "Platform data not found!\n");
479 return -ENODEV;
480 }
481
482 di->regulator = pdata->regulator;
483 if (client->dev.of_node) {
484 di->vendor =
485 (unsigned long)of_device_get_match_data(&client->dev);
486 } else {
487 /* if no ramp constraint set, get the pdata ramp_delay */
488 if (!di->regulator->constraints.ramp_delay) {
489 if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
490 dev_err(&client->dev, "Invalid slew_rate\n");
491 return -EINVAL;
492 }
493
494 di->regulator->constraints.ramp_delay
495 = slew_rates[pdata->slew_rate];
496 }
497
498 di->vendor = id->driver_data;
499 }
500
501 regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
502 if (IS_ERR(regmap)) {
503 dev_err(&client->dev, "Failed to allocate regmap!\n");
504 return PTR_ERR(regmap);
505 }
506 di->dev = &client->dev;
507 i2c_set_clientdata(client, di);
508 /* Get chip ID */
509 ret = regmap_read(regmap, FAN53555_ID1, &val);
510 if (ret < 0) {
511 dev_err(&client->dev, "Failed to get chip ID!\n");
512 return ret;
513 }
514 di->chip_id = val & DIE_ID;
515 /* Get chip revision */
516 ret = regmap_read(regmap, FAN53555_ID2, &val);
517 if (ret < 0) {
518 dev_err(&client->dev, "Failed to get chip Rev!\n");
519 return ret;
520 }
521 di->chip_rev = val & DIE_REV;
522 dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
523 di->chip_id, di->chip_rev);
524 /* Device init */
525 ret = fan53555_device_setup(di, pdata);
526 if (ret < 0) {
527 dev_err(&client->dev, "Failed to setup device!\n");
528 return ret;
529 }
530 /* Register regulator */
531 config.dev = di->dev;
532 config.init_data = di->regulator;
533 config.regmap = regmap;
534 config.driver_data = di;
535 config.of_node = np;
536
537 ret = fan53555_regulator_register(di, &config);
538 if (ret < 0)
539 dev_err(&client->dev, "Failed to register regulator!\n");
540 return ret;
541
542}
543
544static const struct i2c_device_id fan53555_id[] = {
545 {
546 .name = "fan53526",
547 .driver_data = FAN53526_VENDOR_FAIRCHILD
548 }, {
549 .name = "fan53555",
550 .driver_data = FAN53555_VENDOR_FAIRCHILD
551 }, {
552 .name = "syr827",
553 .driver_data = FAN53555_VENDOR_SILERGY
554 }, {
555 .name = "syr828",
556 .driver_data = FAN53555_VENDOR_SILERGY
557 },
558 { },
559};
560MODULE_DEVICE_TABLE(i2c, fan53555_id);
561
562static struct i2c_driver fan53555_regulator_driver = {
563 .driver = {
564 .name = "fan53555-regulator",
565 .of_match_table = of_match_ptr(fan53555_dt_ids),
566 },
567 .probe = fan53555_regulator_probe,
568 .id_table = fan53555_id,
569};
570
571module_i2c_driver(fan53555_regulator_driver);
572
573MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
574MODULE_DESCRIPTION("FAN53555 regulator driver");
575MODULE_LICENSE("GPL v2");
1/*
2 * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
3 *
4 * Supported Part Numbers:
5 * FAN53555UC00X/01X/03X/04X/05X
6 *
7 * Copyright (c) 2012 Marvell Technology Ltd.
8 * Yunfan Zhang <yfzhang@marvell.com>
9 *
10 * This package is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15#include <linux/module.h>
16#include <linux/param.h>
17#include <linux/err.h>
18#include <linux/platform_device.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/machine.h>
21#include <linux/i2c.h>
22#include <linux/slab.h>
23#include <linux/regmap.h>
24#include <linux/regulator/fan53555.h>
25
26/* Voltage setting */
27#define FAN53555_VSEL0 0x00
28#define FAN53555_VSEL1 0x01
29/* Control register */
30#define FAN53555_CONTROL 0x02
31/* IC Type */
32#define FAN53555_ID1 0x03
33/* IC mask version */
34#define FAN53555_ID2 0x04
35/* Monitor register */
36#define FAN53555_MONITOR 0x05
37
38/* VSEL bit definitions */
39#define VSEL_BUCK_EN (1 << 7)
40#define VSEL_MODE (1 << 6)
41#define VSEL_NSEL_MASK 0x3F
42/* Chip ID and Verison */
43#define DIE_ID 0x0F /* ID1 */
44#define DIE_REV 0x0F /* ID2 */
45/* Control bit definitions */
46#define CTL_OUTPUT_DISCHG (1 << 7)
47#define CTL_SLEW_MASK (0x7 << 4)
48#define CTL_SLEW_SHIFT 4
49#define CTL_RESET (1 << 2)
50
51#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
52
53/* IC Type */
54enum {
55 FAN53555_CHIP_ID_00 = 0,
56 FAN53555_CHIP_ID_01,
57 FAN53555_CHIP_ID_02,
58 FAN53555_CHIP_ID_03,
59 FAN53555_CHIP_ID_04,
60 FAN53555_CHIP_ID_05,
61};
62
63struct fan53555_device_info {
64 struct regmap *regmap;
65 struct device *dev;
66 struct regulator_desc desc;
67 struct regulator_dev *rdev;
68 struct regulator_init_data *regulator;
69 /* IC Type and Rev */
70 int chip_id;
71 int chip_rev;
72 /* Voltage setting register */
73 unsigned int vol_reg;
74 unsigned int sleep_reg;
75 /* Voltage range and step(linear) */
76 unsigned int vsel_min;
77 unsigned int vsel_step;
78 /* Voltage slew rate limiting */
79 unsigned int slew_rate;
80 /* Sleep voltage cache */
81 unsigned int sleep_vol_cache;
82};
83
84static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
85{
86 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
87 int ret;
88
89 if (di->sleep_vol_cache == uV)
90 return 0;
91 ret = regulator_map_voltage_linear(rdev, uV, uV);
92 if (ret < 0)
93 return ret;
94 ret = regmap_update_bits(di->regmap, di->sleep_reg,
95 VSEL_NSEL_MASK, ret);
96 if (ret < 0)
97 return ret;
98 /* Cache the sleep voltage setting.
99 * Might not be the real voltage which is rounded */
100 di->sleep_vol_cache = uV;
101
102 return 0;
103}
104
105static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
106{
107 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
108
109 switch (mode) {
110 case REGULATOR_MODE_FAST:
111 regmap_update_bits(di->regmap, di->vol_reg,
112 VSEL_MODE, VSEL_MODE);
113 break;
114 case REGULATOR_MODE_NORMAL:
115 regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
116 break;
117 default:
118 return -EINVAL;
119 }
120 return 0;
121}
122
123static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
124{
125 struct fan53555_device_info *di = rdev_get_drvdata(rdev);
126 unsigned int val;
127 int ret = 0;
128
129 ret = regmap_read(di->regmap, di->vol_reg, &val);
130 if (ret < 0)
131 return ret;
132 if (val & VSEL_MODE)
133 return REGULATOR_MODE_FAST;
134 else
135 return REGULATOR_MODE_NORMAL;
136}
137
138static struct regulator_ops fan53555_regulator_ops = {
139 .set_voltage_sel = regulator_set_voltage_sel_regmap,
140 .get_voltage_sel = regulator_get_voltage_sel_regmap,
141 .map_voltage = regulator_map_voltage_linear,
142 .list_voltage = regulator_list_voltage_linear,
143 .set_suspend_voltage = fan53555_set_suspend_voltage,
144 .enable = regulator_enable_regmap,
145 .disable = regulator_disable_regmap,
146 .is_enabled = regulator_is_enabled_regmap,
147 .set_mode = fan53555_set_mode,
148 .get_mode = fan53555_get_mode,
149};
150
151/* For 00,01,03,05 options:
152 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
153 * For 04 option:
154 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
155 * */
156static int fan53555_device_setup(struct fan53555_device_info *di,
157 struct fan53555_platform_data *pdata)
158{
159 unsigned int reg, data, mask;
160
161 /* Setup voltage control register */
162 switch (pdata->sleep_vsel_id) {
163 case FAN53555_VSEL_ID_0:
164 di->sleep_reg = FAN53555_VSEL0;
165 di->vol_reg = FAN53555_VSEL1;
166 break;
167 case FAN53555_VSEL_ID_1:
168 di->sleep_reg = FAN53555_VSEL1;
169 di->vol_reg = FAN53555_VSEL0;
170 break;
171 default:
172 dev_err(di->dev, "Invalid VSEL ID!\n");
173 return -EINVAL;
174 }
175 /* Init voltage range and step */
176 switch (di->chip_id) {
177 case FAN53555_CHIP_ID_00:
178 case FAN53555_CHIP_ID_01:
179 case FAN53555_CHIP_ID_03:
180 case FAN53555_CHIP_ID_05:
181 di->vsel_min = 600000;
182 di->vsel_step = 10000;
183 break;
184 case FAN53555_CHIP_ID_04:
185 di->vsel_min = 603000;
186 di->vsel_step = 12826;
187 break;
188 default:
189 dev_err(di->dev,
190 "Chip ID[%d]\n not supported!\n", di->chip_id);
191 return -EINVAL;
192 }
193 /* Init slew rate */
194 if (pdata->slew_rate & 0x7)
195 di->slew_rate = pdata->slew_rate;
196 else
197 di->slew_rate = FAN53555_SLEW_RATE_64MV;
198 reg = FAN53555_CONTROL;
199 data = di->slew_rate << CTL_SLEW_SHIFT;
200 mask = CTL_SLEW_MASK;
201 return regmap_update_bits(di->regmap, reg, mask, data);
202}
203
204static int fan53555_regulator_register(struct fan53555_device_info *di,
205 struct regulator_config *config)
206{
207 struct regulator_desc *rdesc = &di->desc;
208
209 rdesc->name = "fan53555-reg";
210 rdesc->ops = &fan53555_regulator_ops;
211 rdesc->type = REGULATOR_VOLTAGE;
212 rdesc->n_voltages = FAN53555_NVOLTAGES;
213 rdesc->enable_reg = di->vol_reg;
214 rdesc->enable_mask = VSEL_BUCK_EN;
215 rdesc->min_uV = di->vsel_min;
216 rdesc->uV_step = di->vsel_step;
217 rdesc->vsel_reg = di->vol_reg;
218 rdesc->vsel_mask = VSEL_NSEL_MASK;
219 rdesc->owner = THIS_MODULE;
220
221 di->rdev = devm_regulator_register(di->dev, &di->desc, config);
222 return PTR_ERR_OR_ZERO(di->rdev);
223}
224
225static struct regmap_config fan53555_regmap_config = {
226 .reg_bits = 8,
227 .val_bits = 8,
228};
229
230static int fan53555_regulator_probe(struct i2c_client *client,
231 const struct i2c_device_id *id)
232{
233 struct fan53555_device_info *di;
234 struct fan53555_platform_data *pdata;
235 struct regulator_config config = { };
236 unsigned int val;
237 int ret;
238
239 pdata = dev_get_platdata(&client->dev);
240 if (!pdata || !pdata->regulator) {
241 dev_err(&client->dev, "Platform data not found!\n");
242 return -ENODEV;
243 }
244
245 di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
246 GFP_KERNEL);
247 if (!di)
248 return -ENOMEM;
249
250 di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
251 if (IS_ERR(di->regmap)) {
252 dev_err(&client->dev, "Failed to allocate regmap!\n");
253 return PTR_ERR(di->regmap);
254 }
255 di->dev = &client->dev;
256 di->regulator = pdata->regulator;
257 i2c_set_clientdata(client, di);
258 /* Get chip ID */
259 ret = regmap_read(di->regmap, FAN53555_ID1, &val);
260 if (ret < 0) {
261 dev_err(&client->dev, "Failed to get chip ID!\n");
262 return ret;
263 }
264 di->chip_id = val & DIE_ID;
265 /* Get chip revision */
266 ret = regmap_read(di->regmap, FAN53555_ID2, &val);
267 if (ret < 0) {
268 dev_err(&client->dev, "Failed to get chip Rev!\n");
269 return ret;
270 }
271 di->chip_rev = val & DIE_REV;
272 dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
273 di->chip_id, di->chip_rev);
274 /* Device init */
275 ret = fan53555_device_setup(di, pdata);
276 if (ret < 0) {
277 dev_err(&client->dev, "Failed to setup device!\n");
278 return ret;
279 }
280 /* Register regulator */
281 config.dev = di->dev;
282 config.init_data = di->regulator;
283 config.regmap = di->regmap;
284 config.driver_data = di;
285 ret = fan53555_regulator_register(di, &config);
286 if (ret < 0)
287 dev_err(&client->dev, "Failed to register regulator!\n");
288 return ret;
289
290}
291
292static const struct i2c_device_id fan53555_id[] = {
293 {"fan53555", -1},
294 { },
295};
296
297static struct i2c_driver fan53555_regulator_driver = {
298 .driver = {
299 .name = "fan53555-regulator",
300 },
301 .probe = fan53555_regulator_probe,
302 .id_table = fan53555_id,
303};
304
305module_i2c_driver(fan53555_regulator_driver);
306
307MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
308MODULE_DESCRIPTION("FAN53555 regulator driver");
309MODULE_LICENSE("GPL v2");