1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max77802.c - Regulator driver for the Maxim 77802
4 //
5 // Copyright (C) 2013-2014 Google, Inc
6 // Simon Glass <sjg@chromium.org>
7 //
8 // Copyright (C) 2012 Samsung Electronics
9 // Chiwoong Byun <woong.byun@samsung.com>
10 // Jonghwa Lee <jonghwa3.lee@samsung.com>
11 //
12 // This driver is based on max8997.c
13
14 #include <linux/kernel.h>
15 #include <linux/bug.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #include <linux/regulator/of_regulator.h>
23 #include <linux/mfd/max77686.h>
24 #include <linux/mfd/max77686-private.h>
25 #include <dt-bindings/regulator/maxim,max77802.h>
26
27 /* Default ramp delay in case it is not manually set */
28 #define MAX77802_RAMP_DELAY 100000 /* uV/us */
29
30 #define MAX77802_OPMODE_SHIFT_LDO 6
31 #define MAX77802_OPMODE_BUCK234_SHIFT 4
32 #define MAX77802_OPMODE_MASK 0x3
33
34 #define MAX77802_VSEL_MASK 0x3F
35 #define MAX77802_DVS_VSEL_MASK 0xFF
36
37 #define MAX77802_RAMP_RATE_MASK_2BIT 0xC0
38 #define MAX77802_RAMP_RATE_SHIFT_2BIT 6
39 #define MAX77802_RAMP_RATE_MASK_4BIT 0xF0
40 #define MAX77802_RAMP_RATE_SHIFT_4BIT 4
41
42 #define MAX77802_STATUS_OFF 0x0
43 #define MAX77802_OFF_PWRREQ 0x1
44 #define MAX77802_LP_PWRREQ 0x2
45
46 /* MAX77802 has two register formats: 2-bit and 4-bit */
47 static const unsigned int ramp_table_77802_2bit[] = {
48 12500,
49 25000,
50 50000,
51 100000,
52 };
53
54 static unsigned int ramp_table_77802_4bit[] = {
55 1000, 2000, 3030, 4000,
56 5000, 5880, 7140, 8330,
57 9090, 10000, 11110, 12500,
58 16670, 25000, 50000, 100000,
59 };
60
61 struct max77802_regulator_prv {
62 /* Array indexed by regulator id */
63 unsigned int opmode[MAX77802_REG_MAX];
64 };
65
max77802_map_mode(unsigned int mode)66 static inline unsigned int max77802_map_mode(unsigned int mode)
67 {
68 return mode == MAX77802_OPMODE_NORMAL ?
69 REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
70 }
71
max77802_get_opmode_shift(int id)72 static int max77802_get_opmode_shift(int id)
73 {
74 if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
75 id <= MAX77802_BUCK10))
76 return 0;
77
78 if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
79 return MAX77802_OPMODE_BUCK234_SHIFT;
80
81 if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
82 return MAX77802_OPMODE_SHIFT_LDO;
83
84 return -EINVAL;
85 }
86
87 /**
88 * max77802_set_suspend_disable - Disable the regulator during system suspend
89 * @rdev: regulator to mark as disabled
90 *
91 * All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
92 * Configure the regulator so the PMIC will turn it OFF during system suspend.
93 */
max77802_set_suspend_disable(struct regulator_dev * rdev)94 static int max77802_set_suspend_disable(struct regulator_dev *rdev)
95 {
96 unsigned int val = MAX77802_OFF_PWRREQ;
97 struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
98 int id = rdev_get_id(rdev);
99 int shift = max77802_get_opmode_shift(id);
100
101 max77802->opmode[id] = val;
102 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
103 rdev->desc->enable_mask, val << shift);
104 }
105
106 /*
107 * Some LDOs support Low Power Mode while the system is running.
108 *
109 * LDOs 1, 3, 20, 21.
110 */
max77802_set_mode(struct regulator_dev * rdev,unsigned int mode)111 static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
112 {
113 struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
114 int id = rdev_get_id(rdev);
115 unsigned int val;
116 int shift = max77802_get_opmode_shift(id);
117
118 switch (mode) {
119 case REGULATOR_MODE_STANDBY:
120 val = MAX77802_OPMODE_LP; /* ON in Low Power Mode */
121 break;
122 case REGULATOR_MODE_NORMAL:
123 val = MAX77802_OPMODE_NORMAL; /* ON in Normal Mode */
124 break;
125 default:
126 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
127 rdev->desc->name, mode);
128 return -EINVAL;
129 }
130
131 max77802->opmode[id] = val;
132 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
133 rdev->desc->enable_mask, val << shift);
134 }
135
max77802_get_mode(struct regulator_dev * rdev)136 static unsigned max77802_get_mode(struct regulator_dev *rdev)
137 {
138 struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
139 int id = rdev_get_id(rdev);
140
141 return max77802_map_mode(max77802->opmode[id]);
142 }
143
144 /**
145 * max77802_set_suspend_mode - set regulator opmode when the system is suspended
146 * @rdev: regulator to change mode
147 * @mode: operating mode to be set
148 *
149 * Will set the operating mode for the regulators during system suspend.
150 * This function is valid for the three different enable control logics:
151 *
152 * Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
153 * Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
154 * Enable Control Logic3 by PWRREQ (LDO 3)
155 *
156 * If setting the regulator mode fails, the function only warns but does
157 * not return an error code to avoid the regulator core to stop setting
158 * the operating mode for the remaining regulators.
159 */
max77802_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)160 static int max77802_set_suspend_mode(struct regulator_dev *rdev,
161 unsigned int mode)
162 {
163 struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
164 int id = rdev_get_id(rdev);
165 unsigned int val;
166 int shift = max77802_get_opmode_shift(id);
167
168 /*
169 * If the regulator has been disabled for suspend
170 * then is invalid to try setting a suspend mode.
171 */
172 if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
173 dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
174 rdev->desc->name, mode);
175 return 0;
176 }
177
178 switch (mode) {
179 case REGULATOR_MODE_STANDBY:
180 /*
181 * If the regulator opmode is normal then enable
182 * ON in Low Power Mode by PWRREQ. If the mode is
183 * already Low Power then no action is required.
184 */
185 if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
186 val = MAX77802_LP_PWRREQ;
187 else
188 return 0;
189 break;
190 case REGULATOR_MODE_NORMAL:
191 /*
192 * If the regulator operating mode is Low Power then
193 * normal is not a valid opmode in suspend. If the
194 * mode is already normal then no action is required.
195 */
196 if (max77802->opmode[id] == MAX77802_OPMODE_LP)
197 dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
198 rdev->desc->name, mode);
199 return 0;
200 default:
201 dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
202 rdev->desc->name, mode);
203 return -EINVAL;
204 }
205
206 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
207 rdev->desc->enable_mask, val << shift);
208 }
209
max77802_enable(struct regulator_dev * rdev)210 static int max77802_enable(struct regulator_dev *rdev)
211 {
212 struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
213 int id = rdev_get_id(rdev);
214 int shift = max77802_get_opmode_shift(id);
215
216 if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
217 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
218
219 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
220 rdev->desc->enable_mask,
221 max77802->opmode[id] << shift);
222 }
223
max77802_find_ramp_value(struct regulator_dev * rdev,const unsigned int limits[],int size,unsigned int ramp_delay)224 static int max77802_find_ramp_value(struct regulator_dev *rdev,
225 const unsigned int limits[], int size,
226 unsigned int ramp_delay)
227 {
228 int i;
229
230 for (i = 0; i < size; i++) {
231 if (ramp_delay <= limits[i])
232 return i;
233 }
234
235 /* Use maximum value for no ramp control */
236 dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
237 rdev->desc->name, ramp_delay);
238 return size - 1;
239 }
240
241 /* Used for BUCKs 2-4 */
max77802_set_ramp_delay_2bit(struct regulator_dev * rdev,int ramp_delay)242 static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
243 int ramp_delay)
244 {
245 int id = rdev_get_id(rdev);
246 unsigned int ramp_value;
247
248 if (id > MAX77802_BUCK4) {
249 dev_warn(&rdev->dev,
250 "%s: regulator: ramp delay not supported\n",
251 rdev->desc->name);
252 return -EINVAL;
253 }
254 ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
255 ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
256
257 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
258 MAX77802_RAMP_RATE_MASK_2BIT,
259 ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
260 }
261
262 /* For BUCK1, 6 */
max77802_set_ramp_delay_4bit(struct regulator_dev * rdev,int ramp_delay)263 static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
264 int ramp_delay)
265 {
266 unsigned int ramp_value;
267
268 ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
269 ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
270
271 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
272 MAX77802_RAMP_RATE_MASK_4BIT,
273 ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
274 }
275
276 /*
277 * LDOs 2, 4-19, 22-35
278 */
279 static const struct regulator_ops max77802_ldo_ops_logic1 = {
280 .list_voltage = regulator_list_voltage_linear,
281 .map_voltage = regulator_map_voltage_linear,
282 .is_enabled = regulator_is_enabled_regmap,
283 .enable = max77802_enable,
284 .disable = regulator_disable_regmap,
285 .get_voltage_sel = regulator_get_voltage_sel_regmap,
286 .set_voltage_sel = regulator_set_voltage_sel_regmap,
287 .set_voltage_time_sel = regulator_set_voltage_time_sel,
288 .set_suspend_disable = max77802_set_suspend_disable,
289 .set_suspend_mode = max77802_set_suspend_mode,
290 };
291
292 /*
293 * LDOs 1, 20, 21, 3
294 */
295 static const struct regulator_ops max77802_ldo_ops_logic2 = {
296 .list_voltage = regulator_list_voltage_linear,
297 .map_voltage = regulator_map_voltage_linear,
298 .is_enabled = regulator_is_enabled_regmap,
299 .enable = max77802_enable,
300 .disable = regulator_disable_regmap,
301 .get_voltage_sel = regulator_get_voltage_sel_regmap,
302 .set_voltage_sel = regulator_set_voltage_sel_regmap,
303 .set_voltage_time_sel = regulator_set_voltage_time_sel,
304 .set_mode = max77802_set_mode,
305 .get_mode = max77802_get_mode,
306 .set_suspend_mode = max77802_set_suspend_mode,
307 };
308
309 /* BUCKS 1, 6 */
310 static const struct regulator_ops max77802_buck_16_dvs_ops = {
311 .list_voltage = regulator_list_voltage_linear,
312 .map_voltage = regulator_map_voltage_linear,
313 .is_enabled = regulator_is_enabled_regmap,
314 .enable = max77802_enable,
315 .disable = regulator_disable_regmap,
316 .get_voltage_sel = regulator_get_voltage_sel_regmap,
317 .set_voltage_sel = regulator_set_voltage_sel_regmap,
318 .set_voltage_time_sel = regulator_set_voltage_time_sel,
319 .set_ramp_delay = max77802_set_ramp_delay_4bit,
320 .set_suspend_disable = max77802_set_suspend_disable,
321 };
322
323 /* BUCKs 2-4 */
324 static const struct regulator_ops max77802_buck_234_ops = {
325 .list_voltage = regulator_list_voltage_linear,
326 .map_voltage = regulator_map_voltage_linear,
327 .is_enabled = regulator_is_enabled_regmap,
328 .enable = max77802_enable,
329 .disable = regulator_disable_regmap,
330 .get_voltage_sel = regulator_get_voltage_sel_regmap,
331 .set_voltage_sel = regulator_set_voltage_sel_regmap,
332 .set_voltage_time_sel = regulator_set_voltage_time_sel,
333 .set_ramp_delay = max77802_set_ramp_delay_2bit,
334 .set_suspend_disable = max77802_set_suspend_disable,
335 .set_suspend_mode = max77802_set_suspend_mode,
336 };
337
338 /* BUCKs 5, 7-10 */
339 static const struct regulator_ops max77802_buck_dvs_ops = {
340 .list_voltage = regulator_list_voltage_linear,
341 .map_voltage = regulator_map_voltage_linear,
342 .is_enabled = regulator_is_enabled_regmap,
343 .enable = max77802_enable,
344 .disable = regulator_disable_regmap,
345 .get_voltage_sel = regulator_get_voltage_sel_regmap,
346 .set_voltage_sel = regulator_set_voltage_sel_regmap,
347 .set_voltage_time_sel = regulator_set_voltage_time_sel,
348 .set_ramp_delay = max77802_set_ramp_delay_2bit,
349 .set_suspend_disable = max77802_set_suspend_disable,
350 };
351
352 /* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
353 #define regulator_77802_desc_p_ldo(num, supply, log) { \
354 .name = "LDO"#num, \
355 .of_match = of_match_ptr("LDO"#num), \
356 .regulators_node = of_match_ptr("regulators"), \
357 .id = MAX77802_LDO##num, \
358 .supply_name = "inl"#supply, \
359 .ops = &max77802_ldo_ops_logic##log, \
360 .type = REGULATOR_VOLTAGE, \
361 .owner = THIS_MODULE, \
362 .min_uV = 800000, \
363 .uV_step = 50000, \
364 .ramp_delay = MAX77802_RAMP_DELAY, \
365 .n_voltages = 1 << 6, \
366 .vsel_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
367 .vsel_mask = MAX77802_VSEL_MASK, \
368 .enable_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
369 .enable_mask = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
370 .of_map_mode = max77802_map_mode, \
371 }
372
373 /* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
374 #define regulator_77802_desc_n_ldo(num, supply, log) { \
375 .name = "LDO"#num, \
376 .of_match = of_match_ptr("LDO"#num), \
377 .regulators_node = of_match_ptr("regulators"), \
378 .id = MAX77802_LDO##num, \
379 .supply_name = "inl"#supply, \
380 .ops = &max77802_ldo_ops_logic##log, \
381 .type = REGULATOR_VOLTAGE, \
382 .owner = THIS_MODULE, \
383 .min_uV = 800000, \
384 .uV_step = 25000, \
385 .ramp_delay = MAX77802_RAMP_DELAY, \
386 .n_voltages = 1 << 6, \
387 .vsel_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
388 .vsel_mask = MAX77802_VSEL_MASK, \
389 .enable_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
390 .enable_mask = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
391 .of_map_mode = max77802_map_mode, \
392 }
393
394 /* BUCKs 1, 6 */
395 #define regulator_77802_desc_16_buck(num) { \
396 .name = "BUCK"#num, \
397 .of_match = of_match_ptr("BUCK"#num), \
398 .regulators_node = of_match_ptr("regulators"), \
399 .id = MAX77802_BUCK##num, \
400 .supply_name = "inb"#num, \
401 .ops = &max77802_buck_16_dvs_ops, \
402 .type = REGULATOR_VOLTAGE, \
403 .owner = THIS_MODULE, \
404 .min_uV = 612500, \
405 .uV_step = 6250, \
406 .ramp_delay = MAX77802_RAMP_DELAY, \
407 .n_voltages = 1 << 8, \
408 .vsel_reg = MAX77802_REG_BUCK ## num ## DVS1, \
409 .vsel_mask = MAX77802_DVS_VSEL_MASK, \
410 .enable_reg = MAX77802_REG_BUCK ## num ## CTRL, \
411 .enable_mask = MAX77802_OPMODE_MASK, \
412 .of_map_mode = max77802_map_mode, \
413 }
414
415 /* BUCKS 2-4 */
416 #define regulator_77802_desc_234_buck(num) { \
417 .name = "BUCK"#num, \
418 .of_match = of_match_ptr("BUCK"#num), \
419 .regulators_node = of_match_ptr("regulators"), \
420 .id = MAX77802_BUCK##num, \
421 .supply_name = "inb"#num, \
422 .ops = &max77802_buck_234_ops, \
423 .type = REGULATOR_VOLTAGE, \
424 .owner = THIS_MODULE, \
425 .min_uV = 600000, \
426 .uV_step = 6250, \
427 .ramp_delay = MAX77802_RAMP_DELAY, \
428 .n_voltages = 0x91, \
429 .vsel_reg = MAX77802_REG_BUCK ## num ## DVS1, \
430 .vsel_mask = MAX77802_DVS_VSEL_MASK, \
431 .enable_reg = MAX77802_REG_BUCK ## num ## CTRL1, \
432 .enable_mask = MAX77802_OPMODE_MASK << \
433 MAX77802_OPMODE_BUCK234_SHIFT, \
434 .of_map_mode = max77802_map_mode, \
435 }
436
437 /* BUCK 5 */
438 #define regulator_77802_desc_buck5(num) { \
439 .name = "BUCK"#num, \
440 .of_match = of_match_ptr("BUCK"#num), \
441 .regulators_node = of_match_ptr("regulators"), \
442 .id = MAX77802_BUCK##num, \
443 .supply_name = "inb"#num, \
444 .ops = &max77802_buck_dvs_ops, \
445 .type = REGULATOR_VOLTAGE, \
446 .owner = THIS_MODULE, \
447 .min_uV = 750000, \
448 .uV_step = 50000, \
449 .ramp_delay = MAX77802_RAMP_DELAY, \
450 .n_voltages = 1 << 6, \
451 .vsel_reg = MAX77802_REG_BUCK5OUT, \
452 .vsel_mask = MAX77802_VSEL_MASK, \
453 .enable_reg = MAX77802_REG_BUCK5CTRL, \
454 .enable_mask = MAX77802_OPMODE_MASK, \
455 .of_map_mode = max77802_map_mode, \
456 }
457
458 /* BUCKs 7-10 */
459 #define regulator_77802_desc_buck7_10(num) { \
460 .name = "BUCK"#num, \
461 .of_match = of_match_ptr("BUCK"#num), \
462 .regulators_node = of_match_ptr("regulators"), \
463 .id = MAX77802_BUCK##num, \
464 .supply_name = "inb"#num, \
465 .ops = &max77802_buck_dvs_ops, \
466 .type = REGULATOR_VOLTAGE, \
467 .owner = THIS_MODULE, \
468 .min_uV = 750000, \
469 .uV_step = 50000, \
470 .ramp_delay = MAX77802_RAMP_DELAY, \
471 .n_voltages = 1 << 6, \
472 .vsel_reg = MAX77802_REG_BUCK7OUT + (num - 7) * 3, \
473 .vsel_mask = MAX77802_VSEL_MASK, \
474 .enable_reg = MAX77802_REG_BUCK7CTRL + (num - 7) * 3, \
475 .enable_mask = MAX77802_OPMODE_MASK, \
476 .of_map_mode = max77802_map_mode, \
477 }
478
479 static const struct regulator_desc regulators[] = {
480 regulator_77802_desc_16_buck(1),
481 regulator_77802_desc_234_buck(2),
482 regulator_77802_desc_234_buck(3),
483 regulator_77802_desc_234_buck(4),
484 regulator_77802_desc_buck5(5),
485 regulator_77802_desc_16_buck(6),
486 regulator_77802_desc_buck7_10(7),
487 regulator_77802_desc_buck7_10(8),
488 regulator_77802_desc_buck7_10(9),
489 regulator_77802_desc_buck7_10(10),
490 regulator_77802_desc_n_ldo(1, 10, 2),
491 regulator_77802_desc_n_ldo(2, 10, 1),
492 regulator_77802_desc_p_ldo(3, 3, 2),
493 regulator_77802_desc_p_ldo(4, 6, 1),
494 regulator_77802_desc_p_ldo(5, 3, 1),
495 regulator_77802_desc_p_ldo(6, 3, 1),
496 regulator_77802_desc_p_ldo(7, 3, 1),
497 regulator_77802_desc_n_ldo(8, 1, 1),
498 regulator_77802_desc_p_ldo(9, 5, 1),
499 regulator_77802_desc_p_ldo(10, 4, 1),
500 regulator_77802_desc_p_ldo(11, 4, 1),
501 regulator_77802_desc_p_ldo(12, 9, 1),
502 regulator_77802_desc_p_ldo(13, 4, 1),
503 regulator_77802_desc_p_ldo(14, 4, 1),
504 regulator_77802_desc_n_ldo(15, 1, 1),
505 regulator_77802_desc_n_ldo(17, 2, 1),
506 regulator_77802_desc_p_ldo(18, 7, 1),
507 regulator_77802_desc_p_ldo(19, 5, 1),
508 regulator_77802_desc_p_ldo(20, 7, 2),
509 regulator_77802_desc_p_ldo(21, 6, 2),
510 regulator_77802_desc_p_ldo(23, 9, 1),
511 regulator_77802_desc_p_ldo(24, 6, 1),
512 regulator_77802_desc_p_ldo(25, 9, 1),
513 regulator_77802_desc_p_ldo(26, 9, 1),
514 regulator_77802_desc_n_ldo(27, 2, 1),
515 regulator_77802_desc_p_ldo(28, 7, 1),
516 regulator_77802_desc_p_ldo(29, 7, 1),
517 regulator_77802_desc_n_ldo(30, 2, 1),
518 regulator_77802_desc_p_ldo(32, 9, 1),
519 regulator_77802_desc_p_ldo(33, 6, 1),
520 regulator_77802_desc_p_ldo(34, 9, 1),
521 regulator_77802_desc_n_ldo(35, 2, 1),
522 };
523
max77802_pmic_probe(struct platform_device * pdev)524 static int max77802_pmic_probe(struct platform_device *pdev)
525 {
526 struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
527 struct max77802_regulator_prv *max77802;
528 int i, val;
529 struct regulator_config config = { };
530
531 max77802 = devm_kzalloc(&pdev->dev,
532 sizeof(struct max77802_regulator_prv),
533 GFP_KERNEL);
534 if (!max77802)
535 return -ENOMEM;
536
537 config.dev = iodev->dev;
538 config.regmap = iodev->regmap;
539 config.driver_data = max77802;
540 platform_set_drvdata(pdev, max77802);
541
542 for (i = 0; i < MAX77802_REG_MAX; i++) {
543 struct regulator_dev *rdev;
544 int id = regulators[i].id;
545 int shift = max77802_get_opmode_shift(id);
546 int ret;
547
548 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
549 if (ret < 0) {
550 dev_warn(&pdev->dev,
551 "cannot read current mode for %d\n", i);
552 val = MAX77802_OPMODE_NORMAL;
553 } else {
554 val = val >> shift & MAX77802_OPMODE_MASK;
555 }
556
557 /*
558 * If the regulator is disabled and the system warm rebooted,
559 * the hardware reports OFF as the regulator operating mode.
560 * Default to operating mode NORMAL in that case.
561 */
562 if (val == MAX77802_STATUS_OFF)
563 max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
564 else
565 max77802->opmode[id] = val;
566
567 rdev = devm_regulator_register(&pdev->dev,
568 ®ulators[i], &config);
569 if (IS_ERR(rdev)) {
570 ret = PTR_ERR(rdev);
571 dev_err(&pdev->dev,
572 "regulator init failed for %d: %d\n", i, ret);
573 return ret;
574 }
575 }
576
577 return 0;
578 }
579
580 static const struct platform_device_id max77802_pmic_id[] = {
581 {"max77802-pmic", 0},
582 { },
583 };
584 MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
585
586 static struct platform_driver max77802_pmic_driver = {
587 .driver = {
588 .name = "max77802-pmic",
589 },
590 .probe = max77802_pmic_probe,
591 .id_table = max77802_pmic_id,
592 };
593
594 module_platform_driver(max77802_pmic_driver);
595
596 MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
597 MODULE_AUTHOR("Simon Glass <sjg@chromium.org>");
598 MODULE_LICENSE("GPL");
599