1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // wm831x-dcdc.c -- DC-DC buck converter driver for the WM831x series
4 //
5 // Copyright 2009 Wolfson Microelectronics PLC.
6 //
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/bitops.h>
13 #include <linux/err.h>
14 #include <linux/i2c.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/slab.h>
20
21 #include <linux/mfd/wm831x/core.h>
22 #include <linux/mfd/wm831x/regulator.h>
23 #include <linux/mfd/wm831x/pdata.h>
24
25 #define WM831X_BUCKV_MAX_SELECTOR 0x68
26 #define WM831X_BUCKP_MAX_SELECTOR 0x66
27
28 #define WM831X_DCDC_MODE_FAST 0
29 #define WM831X_DCDC_MODE_NORMAL 1
30 #define WM831X_DCDC_MODE_IDLE 2
31 #define WM831X_DCDC_MODE_STANDBY 3
32
33 #define WM831X_DCDC_MAX_NAME 9
34
35 /* Register offsets in control block */
36 #define WM831X_DCDC_CONTROL_1 0
37 #define WM831X_DCDC_CONTROL_2 1
38 #define WM831X_DCDC_ON_CONFIG 2
39 #define WM831X_DCDC_SLEEP_CONTROL 3
40 #define WM831X_DCDC_DVS_CONTROL 4
41
42 /*
43 * Shared
44 */
45
46 struct wm831x_dcdc {
47 char name[WM831X_DCDC_MAX_NAME];
48 char supply_name[WM831X_DCDC_MAX_NAME];
49 struct regulator_desc desc;
50 int base;
51 struct wm831x *wm831x;
52 struct regulator_dev *regulator;
53 struct gpio_desc *dvs_gpiod;
54 int dvs_gpio_state;
55 int on_vsel;
56 int dvs_vsel;
57 };
58
wm831x_dcdc_get_mode(struct regulator_dev * rdev)59 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
60
61 {
62 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
63 struct wm831x *wm831x = dcdc->wm831x;
64 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
65 int val;
66
67 val = wm831x_reg_read(wm831x, reg);
68 if (val < 0)
69 return val;
70
71 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
72
73 switch (val) {
74 case WM831X_DCDC_MODE_FAST:
75 return REGULATOR_MODE_FAST;
76 case WM831X_DCDC_MODE_NORMAL:
77 return REGULATOR_MODE_NORMAL;
78 case WM831X_DCDC_MODE_STANDBY:
79 return REGULATOR_MODE_STANDBY;
80 case WM831X_DCDC_MODE_IDLE:
81 return REGULATOR_MODE_IDLE;
82 default:
83 BUG();
84 return -EINVAL;
85 }
86 }
87
wm831x_dcdc_set_mode_int(struct wm831x * wm831x,int reg,unsigned int mode)88 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
89 unsigned int mode)
90 {
91 int val;
92
93 switch (mode) {
94 case REGULATOR_MODE_FAST:
95 val = WM831X_DCDC_MODE_FAST;
96 break;
97 case REGULATOR_MODE_NORMAL:
98 val = WM831X_DCDC_MODE_NORMAL;
99 break;
100 case REGULATOR_MODE_STANDBY:
101 val = WM831X_DCDC_MODE_STANDBY;
102 break;
103 case REGULATOR_MODE_IDLE:
104 val = WM831X_DCDC_MODE_IDLE;
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
111 val << WM831X_DC1_ON_MODE_SHIFT);
112 }
113
wm831x_dcdc_set_mode(struct regulator_dev * rdev,unsigned int mode)114 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
115 {
116 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
117 struct wm831x *wm831x = dcdc->wm831x;
118 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
119
120 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
121 }
122
wm831x_dcdc_set_suspend_mode(struct regulator_dev * rdev,unsigned int mode)123 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
124 unsigned int mode)
125 {
126 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
127 struct wm831x *wm831x = dcdc->wm831x;
128 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
129
130 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
131 }
132
wm831x_dcdc_get_status(struct regulator_dev * rdev)133 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
134 {
135 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
136 struct wm831x *wm831x = dcdc->wm831x;
137 int ret;
138
139 /* First, check for errors */
140 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
141 if (ret < 0)
142 return ret;
143
144 if (ret & (1 << rdev_get_id(rdev))) {
145 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
146 rdev_get_id(rdev) + 1);
147 return REGULATOR_STATUS_ERROR;
148 }
149
150 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
151 if (rdev_get_id(rdev) < 2) {
152 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
153 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
154 rdev_get_id(rdev) + 1);
155 return REGULATOR_STATUS_ERROR;
156 }
157
158 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
159 dev_dbg(wm831x->dev, "DCDC%d over current\n",
160 rdev_get_id(rdev) + 1);
161 return REGULATOR_STATUS_ERROR;
162 }
163 }
164
165 /* Is the regulator on? */
166 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
167 if (ret < 0)
168 return ret;
169 if (!(ret & (1 << rdev_get_id(rdev))))
170 return REGULATOR_STATUS_OFF;
171
172 /* TODO: When we handle hardware control modes so we can report the
173 * current mode. */
174 return REGULATOR_STATUS_ON;
175 }
176
wm831x_dcdc_uv_irq(int irq,void * data)177 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
178 {
179 struct wm831x_dcdc *dcdc = data;
180
181 regulator_notifier_call_chain(dcdc->regulator,
182 REGULATOR_EVENT_UNDER_VOLTAGE,
183 NULL);
184
185 return IRQ_HANDLED;
186 }
187
wm831x_dcdc_oc_irq(int irq,void * data)188 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
189 {
190 struct wm831x_dcdc *dcdc = data;
191
192 regulator_notifier_call_chain(dcdc->regulator,
193 REGULATOR_EVENT_OVER_CURRENT,
194 NULL);
195
196 return IRQ_HANDLED;
197 }
198
199 /*
200 * BUCKV specifics
201 */
202
203 static const struct linear_range wm831x_buckv_ranges[] = {
204 REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
205 REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
206 };
207
wm831x_buckv_set_dvs(struct regulator_dev * rdev,int state)208 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
209 {
210 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
211
212 if (state == dcdc->dvs_gpio_state)
213 return 0;
214
215 dcdc->dvs_gpio_state = state;
216 gpiod_set_value(dcdc->dvs_gpiod, state);
217
218 /* Should wait for DVS state change to be asserted if we have
219 * a GPIO for it, for now assume the device is configured
220 * for the fastest possible transition.
221 */
222
223 return 0;
224 }
225
wm831x_buckv_set_voltage_sel(struct regulator_dev * rdev,unsigned vsel)226 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
227 unsigned vsel)
228 {
229 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
230 struct wm831x *wm831x = dcdc->wm831x;
231 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
232 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
233 int ret;
234
235 /* If this value is already set then do a GPIO update if we can */
236 if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
237 return wm831x_buckv_set_dvs(rdev, 0);
238
239 if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
240 return wm831x_buckv_set_dvs(rdev, 1);
241
242 /* Always set the ON status to the minimum voltage */
243 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
244 if (ret < 0)
245 return ret;
246 dcdc->on_vsel = vsel;
247
248 if (!dcdc->dvs_gpiod)
249 return ret;
250
251 /* Kick the voltage transition now */
252 ret = wm831x_buckv_set_dvs(rdev, 0);
253 if (ret < 0)
254 return ret;
255
256 /*
257 * If this VSEL is higher than the last one we've seen then
258 * remember it as the DVS VSEL. This is optimised for CPUfreq
259 * usage where we want to get to the highest voltage very
260 * quickly.
261 */
262 if (vsel > dcdc->dvs_vsel) {
263 ret = wm831x_set_bits(wm831x, dvs_reg,
264 WM831X_DC1_DVS_VSEL_MASK,
265 vsel);
266 if (ret == 0)
267 dcdc->dvs_vsel = vsel;
268 else
269 dev_warn(wm831x->dev,
270 "Failed to set DCDC DVS VSEL: %d\n", ret);
271 }
272
273 return 0;
274 }
275
wm831x_buckv_set_suspend_voltage(struct regulator_dev * rdev,int uV)276 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
277 int uV)
278 {
279 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
280 struct wm831x *wm831x = dcdc->wm831x;
281 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
282 int vsel;
283
284 vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
285 if (vsel < 0)
286 return vsel;
287
288 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
289 }
290
wm831x_buckv_get_voltage_sel(struct regulator_dev * rdev)291 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
292 {
293 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
294
295 if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
296 return dcdc->dvs_vsel;
297 else
298 return dcdc->on_vsel;
299 }
300
301 /* Current limit options */
302 static const unsigned int wm831x_dcdc_ilim[] = {
303 125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
304 };
305
306 static const struct regulator_ops wm831x_buckv_ops = {
307 .set_voltage_sel = wm831x_buckv_set_voltage_sel,
308 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
309 .list_voltage = regulator_list_voltage_linear_range,
310 .map_voltage = regulator_map_voltage_linear_range,
311 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
312 .set_current_limit = regulator_set_current_limit_regmap,
313 .get_current_limit = regulator_get_current_limit_regmap,
314
315 .is_enabled = regulator_is_enabled_regmap,
316 .enable = regulator_enable_regmap,
317 .disable = regulator_disable_regmap,
318 .get_status = wm831x_dcdc_get_status,
319 .get_mode = wm831x_dcdc_get_mode,
320 .set_mode = wm831x_dcdc_set_mode,
321 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
322 };
323
324 /*
325 * Set up DVS control. We just log errors since we can still run
326 * (with reduced performance) if we fail.
327 */
wm831x_buckv_dvs_init(struct platform_device * pdev,struct wm831x_dcdc * dcdc,struct wm831x_buckv_pdata * pdata)328 static void wm831x_buckv_dvs_init(struct platform_device *pdev,
329 struct wm831x_dcdc *dcdc,
330 struct wm831x_buckv_pdata *pdata)
331 {
332 struct wm831x *wm831x = dcdc->wm831x;
333 int ret;
334 u16 ctrl;
335
336 if (!pdata)
337 return;
338
339 /* gpiolib won't let us read the GPIO status so pick the higher
340 * of the two existing voltages so we take it as platform data.
341 */
342 dcdc->dvs_gpio_state = pdata->dvs_init_state;
343
344 dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
345 dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
346 if (IS_ERR(dcdc->dvs_gpiod)) {
347 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
348 dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
349 return;
350 }
351
352 switch (pdata->dvs_control_src) {
353 case 1:
354 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
355 break;
356 case 2:
357 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
358 break;
359 default:
360 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
361 pdata->dvs_control_src, dcdc->name);
362 return;
363 }
364
365 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
366 * to make bootstrapping a bit smoother.
367 */
368 if (!dcdc->dvs_vsel) {
369 ret = wm831x_set_bits(wm831x,
370 dcdc->base + WM831X_DCDC_DVS_CONTROL,
371 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
372 if (ret == 0)
373 dcdc->dvs_vsel = dcdc->on_vsel;
374 else
375 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
376 ret);
377 }
378
379 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
380 WM831X_DC1_DVS_SRC_MASK, ctrl);
381 if (ret < 0) {
382 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
383 dcdc->name, ret);
384 }
385 }
386
wm831x_buckv_probe(struct platform_device * pdev)387 static int wm831x_buckv_probe(struct platform_device *pdev)
388 {
389 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
390 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
391 struct regulator_config config = { };
392 int id;
393 struct wm831x_dcdc *dcdc;
394 struct resource *res;
395 int ret, irq;
396
397 if (pdata && pdata->wm831x_num)
398 id = (pdata->wm831x_num * 10) + 1;
399 else
400 id = 0;
401 id = pdev->id - id;
402
403 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
404
405 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
406 GFP_KERNEL);
407 if (!dcdc)
408 return -ENOMEM;
409
410 dcdc->wm831x = wm831x;
411
412 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
413 if (res == NULL) {
414 dev_err(&pdev->dev, "No REG resource\n");
415 ret = -EINVAL;
416 goto err;
417 }
418 dcdc->base = res->start;
419
420 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
421 dcdc->desc.name = dcdc->name;
422
423 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
424 "DC%dVDD", id + 1);
425 dcdc->desc.supply_name = dcdc->supply_name;
426
427 dcdc->desc.id = id;
428 dcdc->desc.type = REGULATOR_VOLTAGE;
429 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
430 dcdc->desc.linear_ranges = wm831x_buckv_ranges;
431 dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
432 dcdc->desc.ops = &wm831x_buckv_ops;
433 dcdc->desc.owner = THIS_MODULE;
434 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
435 dcdc->desc.enable_mask = 1 << id;
436 dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
437 dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
438 dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
439 dcdc->desc.curr_table = wm831x_dcdc_ilim;
440
441 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
442 if (ret < 0) {
443 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
444 goto err;
445 }
446 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
447
448 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
449 if (ret < 0) {
450 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
451 goto err;
452 }
453 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
454
455 if (pdata && pdata->dcdc[id])
456 wm831x_buckv_dvs_init(pdev, dcdc,
457 pdata->dcdc[id]->driver_data);
458
459 config.dev = pdev->dev.parent;
460 if (pdata)
461 config.init_data = pdata->dcdc[id];
462 config.driver_data = dcdc;
463 config.regmap = wm831x->regmap;
464
465 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
466 &config);
467 if (IS_ERR(dcdc->regulator)) {
468 ret = PTR_ERR(dcdc->regulator);
469 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
470 id + 1, ret);
471 goto err;
472 }
473
474 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
475 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
476 wm831x_dcdc_uv_irq,
477 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
478 dcdc->name, dcdc);
479 if (ret != 0) {
480 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
481 irq, ret);
482 goto err;
483 }
484
485 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
486 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
487 wm831x_dcdc_oc_irq,
488 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
489 dcdc->name, dcdc);
490 if (ret != 0) {
491 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
492 irq, ret);
493 goto err;
494 }
495
496 platform_set_drvdata(pdev, dcdc);
497
498 return 0;
499
500 err:
501 return ret;
502 }
503
504 static struct platform_driver wm831x_buckv_driver = {
505 .probe = wm831x_buckv_probe,
506 .driver = {
507 .name = "wm831x-buckv",
508 },
509 };
510
511 /*
512 * BUCKP specifics
513 */
514
wm831x_buckp_set_suspend_voltage(struct regulator_dev * rdev,int uV)515 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
516 {
517 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
518 struct wm831x *wm831x = dcdc->wm831x;
519 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
520 int sel;
521
522 sel = regulator_map_voltage_linear(rdev, uV, uV);
523 if (sel < 0)
524 return sel;
525
526 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
527 }
528
529 static const struct regulator_ops wm831x_buckp_ops = {
530 .set_voltage_sel = regulator_set_voltage_sel_regmap,
531 .get_voltage_sel = regulator_get_voltage_sel_regmap,
532 .list_voltage = regulator_list_voltage_linear,
533 .map_voltage = regulator_map_voltage_linear,
534 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
535
536 .is_enabled = regulator_is_enabled_regmap,
537 .enable = regulator_enable_regmap,
538 .disable = regulator_disable_regmap,
539 .get_status = wm831x_dcdc_get_status,
540 .get_mode = wm831x_dcdc_get_mode,
541 .set_mode = wm831x_dcdc_set_mode,
542 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
543 };
544
wm831x_buckp_probe(struct platform_device * pdev)545 static int wm831x_buckp_probe(struct platform_device *pdev)
546 {
547 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
548 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
549 struct regulator_config config = { };
550 int id;
551 struct wm831x_dcdc *dcdc;
552 struct resource *res;
553 int ret, irq;
554
555 if (pdata && pdata->wm831x_num)
556 id = (pdata->wm831x_num * 10) + 1;
557 else
558 id = 0;
559 id = pdev->id - id;
560
561 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
562
563 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
564 GFP_KERNEL);
565 if (!dcdc)
566 return -ENOMEM;
567
568 dcdc->wm831x = wm831x;
569
570 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
571 if (res == NULL) {
572 dev_err(&pdev->dev, "No REG resource\n");
573 ret = -EINVAL;
574 goto err;
575 }
576 dcdc->base = res->start;
577
578 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
579 dcdc->desc.name = dcdc->name;
580
581 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
582 "DC%dVDD", id + 1);
583 dcdc->desc.supply_name = dcdc->supply_name;
584
585 dcdc->desc.id = id;
586 dcdc->desc.type = REGULATOR_VOLTAGE;
587 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
588 dcdc->desc.ops = &wm831x_buckp_ops;
589 dcdc->desc.owner = THIS_MODULE;
590 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
591 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
592 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
593 dcdc->desc.enable_mask = 1 << id;
594 dcdc->desc.min_uV = 850000;
595 dcdc->desc.uV_step = 25000;
596
597 config.dev = pdev->dev.parent;
598 if (pdata)
599 config.init_data = pdata->dcdc[id];
600 config.driver_data = dcdc;
601 config.regmap = wm831x->regmap;
602
603 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
604 &config);
605 if (IS_ERR(dcdc->regulator)) {
606 ret = PTR_ERR(dcdc->regulator);
607 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
608 id + 1, ret);
609 goto err;
610 }
611
612 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
613 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
614 wm831x_dcdc_uv_irq,
615 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
616 dcdc->name, dcdc);
617 if (ret != 0) {
618 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
619 irq, ret);
620 goto err;
621 }
622
623 platform_set_drvdata(pdev, dcdc);
624
625 return 0;
626
627 err:
628 return ret;
629 }
630
631 static struct platform_driver wm831x_buckp_driver = {
632 .probe = wm831x_buckp_probe,
633 .driver = {
634 .name = "wm831x-buckp",
635 },
636 };
637
638 /*
639 * DCDC boost convertors
640 */
641
wm831x_boostp_get_status(struct regulator_dev * rdev)642 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
643 {
644 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
645 struct wm831x *wm831x = dcdc->wm831x;
646 int ret;
647
648 /* First, check for errors */
649 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
650 if (ret < 0)
651 return ret;
652
653 if (ret & (1 << rdev_get_id(rdev))) {
654 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
655 rdev_get_id(rdev) + 1);
656 return REGULATOR_STATUS_ERROR;
657 }
658
659 /* Is the regulator on? */
660 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
661 if (ret < 0)
662 return ret;
663 if (ret & (1 << rdev_get_id(rdev)))
664 return REGULATOR_STATUS_ON;
665 else
666 return REGULATOR_STATUS_OFF;
667 }
668
669 static const struct regulator_ops wm831x_boostp_ops = {
670 .get_status = wm831x_boostp_get_status,
671
672 .is_enabled = regulator_is_enabled_regmap,
673 .enable = regulator_enable_regmap,
674 .disable = regulator_disable_regmap,
675 };
676
wm831x_boostp_probe(struct platform_device * pdev)677 static int wm831x_boostp_probe(struct platform_device *pdev)
678 {
679 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
680 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
681 struct regulator_config config = { };
682 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
683 struct wm831x_dcdc *dcdc;
684 struct resource *res;
685 int ret, irq;
686
687 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
688
689 if (pdata == NULL || pdata->dcdc[id] == NULL)
690 return -ENODEV;
691
692 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
693 if (!dcdc)
694 return -ENOMEM;
695
696 dcdc->wm831x = wm831x;
697
698 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
699 if (res == NULL) {
700 dev_err(&pdev->dev, "No REG resource\n");
701 return -EINVAL;
702 }
703 dcdc->base = res->start;
704
705 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
706 dcdc->desc.name = dcdc->name;
707 dcdc->desc.id = id;
708 dcdc->desc.type = REGULATOR_VOLTAGE;
709 dcdc->desc.ops = &wm831x_boostp_ops;
710 dcdc->desc.owner = THIS_MODULE;
711 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
712 dcdc->desc.enable_mask = 1 << id;
713
714 config.dev = pdev->dev.parent;
715 if (pdata)
716 config.init_data = pdata->dcdc[id];
717 config.driver_data = dcdc;
718 config.regmap = wm831x->regmap;
719
720 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
721 &config);
722 if (IS_ERR(dcdc->regulator)) {
723 ret = PTR_ERR(dcdc->regulator);
724 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
725 id + 1, ret);
726 return ret;
727 }
728
729 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
730 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
731 wm831x_dcdc_uv_irq,
732 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
733 dcdc->name,
734 dcdc);
735 if (ret != 0) {
736 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
737 irq, ret);
738 return ret;
739 }
740
741 platform_set_drvdata(pdev, dcdc);
742
743 return 0;
744 }
745
746 static struct platform_driver wm831x_boostp_driver = {
747 .probe = wm831x_boostp_probe,
748 .driver = {
749 .name = "wm831x-boostp",
750 },
751 };
752
753 /*
754 * External Power Enable
755 *
756 * These aren't actually DCDCs but look like them in hardware so share
757 * code.
758 */
759
760 #define WM831X_EPE_BASE 6
761
762 static const struct regulator_ops wm831x_epe_ops = {
763 .is_enabled = regulator_is_enabled_regmap,
764 .enable = regulator_enable_regmap,
765 .disable = regulator_disable_regmap,
766 .get_status = wm831x_dcdc_get_status,
767 };
768
wm831x_epe_probe(struct platform_device * pdev)769 static int wm831x_epe_probe(struct platform_device *pdev)
770 {
771 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
772 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
773 struct regulator_config config = { };
774 int id = pdev->id % ARRAY_SIZE(pdata->epe);
775 struct wm831x_dcdc *dcdc;
776 int ret;
777
778 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
779
780 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
781 if (!dcdc)
782 return -ENOMEM;
783
784 dcdc->wm831x = wm831x;
785
786 /* For current parts this is correct; probably need to revisit
787 * in future.
788 */
789 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
790 dcdc->desc.name = dcdc->name;
791 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
792 dcdc->desc.ops = &wm831x_epe_ops;
793 dcdc->desc.type = REGULATOR_VOLTAGE;
794 dcdc->desc.owner = THIS_MODULE;
795 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
796 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
797
798 config.dev = pdev->dev.parent;
799 if (pdata)
800 config.init_data = pdata->epe[id];
801 config.driver_data = dcdc;
802 config.regmap = wm831x->regmap;
803
804 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
805 &config);
806 if (IS_ERR(dcdc->regulator)) {
807 ret = PTR_ERR(dcdc->regulator);
808 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
809 id + 1, ret);
810 goto err;
811 }
812
813 platform_set_drvdata(pdev, dcdc);
814
815 return 0;
816
817 err:
818 return ret;
819 }
820
821 static struct platform_driver wm831x_epe_driver = {
822 .probe = wm831x_epe_probe,
823 .driver = {
824 .name = "wm831x-epe",
825 },
826 };
827
828 static struct platform_driver * const drivers[] = {
829 &wm831x_buckv_driver,
830 &wm831x_buckp_driver,
831 &wm831x_boostp_driver,
832 &wm831x_epe_driver,
833 };
834
wm831x_dcdc_init(void)835 static int __init wm831x_dcdc_init(void)
836 {
837 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
838 }
839 subsys_initcall(wm831x_dcdc_init);
840
wm831x_dcdc_exit(void)841 static void __exit wm831x_dcdc_exit(void)
842 {
843 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
844 }
845 module_exit(wm831x_dcdc_exit);
846
847 /* Module information */
848 MODULE_AUTHOR("Mark Brown");
849 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
850 MODULE_LICENSE("GPL");
851 MODULE_ALIAS("platform:wm831x-buckv");
852 MODULE_ALIAS("platform:wm831x-buckp");
853 MODULE_ALIAS("platform:wm831x-boostp");
854 MODULE_ALIAS("platform:wm831x-epe");
855