1 // SPDX-License-Identifier: GPL-2.0+
3 // wm831x-ldo.c -- LDO driver for the WM831x series
5 // Copyright 2009 Wolfson Microelectronics PLC.
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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/slab.h>
19 #include <linux/mfd/wm831x/core.h>
20 #include <linux/mfd/wm831x/regulator.h>
21 #include <linux/mfd/wm831x/pdata.h>
23 #define WM831X_LDO_MAX_NAME 9
25 #define WM831X_LDO_CONTROL 0
26 #define WM831X_LDO_ON_CONTROL 1
27 #define WM831X_LDO_SLEEP_CONTROL 2
29 #define WM831X_ALIVE_LDO_ON_CONTROL 0
30 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
33 char name[WM831X_LDO_MAX_NAME];
34 char supply_name[WM831X_LDO_MAX_NAME];
35 struct regulator_desc desc;
37 struct wm831x *wm831x;
38 struct regulator_dev *regulator;
45 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
47 struct wm831x_ldo *ldo = data;
49 regulator_notifier_call_chain(ldo->regulator,
50 REGULATOR_EVENT_UNDER_VOLTAGE,
57 * General purpose LDOs
60 static const struct linear_range wm831x_gp_ldo_ranges[] = {
61 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
62 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
65 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
68 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
69 struct wm831x *wm831x = ldo->wm831x;
70 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
72 sel = regulator_map_voltage_linear_range(rdev, uV, uV);
76 return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
79 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
81 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
82 struct wm831x *wm831x = ldo->wm831x;
83 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
84 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
87 ret = wm831x_reg_read(wm831x, on_reg);
91 if (!(ret & WM831X_LDO1_ON_MODE))
92 return REGULATOR_MODE_NORMAL;
94 ret = wm831x_reg_read(wm831x, ctrl_reg);
98 if (ret & WM831X_LDO1_LP_MODE)
99 return REGULATOR_MODE_STANDBY;
101 return REGULATOR_MODE_IDLE;
104 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
107 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
108 struct wm831x *wm831x = ldo->wm831x;
109 int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
110 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
115 case REGULATOR_MODE_NORMAL:
116 ret = wm831x_set_bits(wm831x, on_reg,
117 WM831X_LDO1_ON_MODE, 0);
122 case REGULATOR_MODE_IDLE:
123 ret = wm831x_set_bits(wm831x, ctrl_reg,
124 WM831X_LDO1_LP_MODE, 0);
128 ret = wm831x_set_bits(wm831x, on_reg,
130 WM831X_LDO1_ON_MODE);
135 case REGULATOR_MODE_STANDBY:
136 ret = wm831x_set_bits(wm831x, ctrl_reg,
138 WM831X_LDO1_LP_MODE);
142 ret = wm831x_set_bits(wm831x, on_reg,
144 WM831X_LDO1_ON_MODE);
156 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
158 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
159 struct wm831x *wm831x = ldo->wm831x;
160 int mask = 1 << rdev_get_id(rdev);
163 /* Is the regulator on? */
164 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
168 return REGULATOR_STATUS_OFF;
170 /* Is it reporting under voltage? */
171 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
175 return REGULATOR_STATUS_ERROR;
177 ret = wm831x_gp_ldo_get_mode(rdev);
181 return regulator_mode_to_status(ret);
184 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
186 int output_uV, int load_uA)
189 return REGULATOR_MODE_STANDBY;
191 return REGULATOR_MODE_IDLE;
192 return REGULATOR_MODE_NORMAL;
196 static const struct regulator_ops wm831x_gp_ldo_ops = {
197 .list_voltage = regulator_list_voltage_linear_range,
198 .map_voltage = regulator_map_voltage_linear_range,
199 .get_voltage_sel = regulator_get_voltage_sel_regmap,
200 .set_voltage_sel = regulator_set_voltage_sel_regmap,
201 .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
202 .get_mode = wm831x_gp_ldo_get_mode,
203 .set_mode = wm831x_gp_ldo_set_mode,
204 .get_status = wm831x_gp_ldo_get_status,
205 .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
206 .get_bypass = regulator_get_bypass_regmap,
207 .set_bypass = regulator_set_bypass_regmap,
209 .is_enabled = regulator_is_enabled_regmap,
210 .enable = regulator_enable_regmap,
211 .disable = regulator_disable_regmap,
214 static int wm831x_gp_ldo_probe(struct platform_device *pdev)
216 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
217 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
218 struct regulator_config config = { };
220 struct wm831x_ldo *ldo;
221 struct resource *res;
224 if (pdata && pdata->wm831x_num)
225 id = (pdata->wm831x_num * 10) + 1;
230 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
232 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
236 ldo->wm831x = wm831x;
238 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
240 dev_err(&pdev->dev, "No REG resource\n");
244 ldo->base = res->start;
246 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
247 ldo->desc.name = ldo->name;
249 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
251 ldo->desc.supply_name = ldo->supply_name;
254 ldo->desc.type = REGULATOR_VOLTAGE;
255 ldo->desc.n_voltages = 32;
256 ldo->desc.ops = &wm831x_gp_ldo_ops;
257 ldo->desc.owner = THIS_MODULE;
258 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
259 ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
260 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
261 ldo->desc.enable_mask = 1 << id;
262 ldo->desc.bypass_reg = ldo->base;
263 ldo->desc.bypass_mask = WM831X_LDO1_SWI;
264 ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
265 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);
267 config.dev = pdev->dev.parent;
269 config.init_data = pdata->ldo[id];
270 config.driver_data = ldo;
271 config.regmap = wm831x->regmap;
273 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
275 if (IS_ERR(ldo->regulator)) {
276 ret = PTR_ERR(ldo->regulator);
277 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
282 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
283 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
285 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
289 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
294 platform_set_drvdata(pdev, ldo);
302 static struct platform_driver wm831x_gp_ldo_driver = {
303 .probe = wm831x_gp_ldo_probe,
305 .name = "wm831x-ldo",
313 static const struct linear_range wm831x_aldo_ranges[] = {
314 REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
315 REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
318 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
321 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
322 struct wm831x *wm831x = ldo->wm831x;
323 int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
325 sel = regulator_map_voltage_linear_range(rdev, uV, uV);
329 return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
332 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
334 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
335 struct wm831x *wm831x = ldo->wm831x;
336 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
339 ret = wm831x_reg_read(wm831x, on_reg);
343 if (ret & WM831X_LDO7_ON_MODE)
344 return REGULATOR_MODE_IDLE;
346 return REGULATOR_MODE_NORMAL;
349 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
352 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
353 struct wm831x *wm831x = ldo->wm831x;
354 int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
359 case REGULATOR_MODE_NORMAL:
360 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
365 case REGULATOR_MODE_IDLE:
366 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
367 WM831X_LDO7_ON_MODE);
379 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
381 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
382 struct wm831x *wm831x = ldo->wm831x;
383 int mask = 1 << rdev_get_id(rdev);
386 /* Is the regulator on? */
387 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
391 return REGULATOR_STATUS_OFF;
393 /* Is it reporting under voltage? */
394 ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
398 return REGULATOR_STATUS_ERROR;
400 ret = wm831x_aldo_get_mode(rdev);
404 return regulator_mode_to_status(ret);
407 static const struct regulator_ops wm831x_aldo_ops = {
408 .list_voltage = regulator_list_voltage_linear_range,
409 .map_voltage = regulator_map_voltage_linear_range,
410 .get_voltage_sel = regulator_get_voltage_sel_regmap,
411 .set_voltage_sel = regulator_set_voltage_sel_regmap,
412 .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
413 .get_mode = wm831x_aldo_get_mode,
414 .set_mode = wm831x_aldo_set_mode,
415 .get_status = wm831x_aldo_get_status,
416 .set_bypass = regulator_set_bypass_regmap,
417 .get_bypass = regulator_get_bypass_regmap,
419 .is_enabled = regulator_is_enabled_regmap,
420 .enable = regulator_enable_regmap,
421 .disable = regulator_disable_regmap,
424 static int wm831x_aldo_probe(struct platform_device *pdev)
426 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
427 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
428 struct regulator_config config = { };
430 struct wm831x_ldo *ldo;
431 struct resource *res;
434 if (pdata && pdata->wm831x_num)
435 id = (pdata->wm831x_num * 10) + 1;
440 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
442 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
446 ldo->wm831x = wm831x;
448 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
450 dev_err(&pdev->dev, "No REG resource\n");
454 ldo->base = res->start;
456 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
457 ldo->desc.name = ldo->name;
459 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
461 ldo->desc.supply_name = ldo->supply_name;
464 ldo->desc.type = REGULATOR_VOLTAGE;
465 ldo->desc.n_voltages = 32;
466 ldo->desc.linear_ranges = wm831x_aldo_ranges;
467 ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
468 ldo->desc.ops = &wm831x_aldo_ops;
469 ldo->desc.owner = THIS_MODULE;
470 ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
471 ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
472 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
473 ldo->desc.enable_mask = 1 << id;
474 ldo->desc.bypass_reg = ldo->base;
475 ldo->desc.bypass_mask = WM831X_LDO7_SWI;
477 config.dev = pdev->dev.parent;
479 config.init_data = pdata->ldo[id];
480 config.driver_data = ldo;
481 config.regmap = wm831x->regmap;
483 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
485 if (IS_ERR(ldo->regulator)) {
486 ret = PTR_ERR(ldo->regulator);
487 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
492 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
493 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
495 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
498 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
503 platform_set_drvdata(pdev, ldo);
511 static struct platform_driver wm831x_aldo_driver = {
512 .probe = wm831x_aldo_probe,
514 .name = "wm831x-aldo",
522 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
524 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
527 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
528 struct wm831x *wm831x = ldo->wm831x;
529 int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
531 sel = regulator_map_voltage_linear(rdev, uV, uV);
535 return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
538 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
540 struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
541 struct wm831x *wm831x = ldo->wm831x;
542 int mask = 1 << rdev_get_id(rdev);
545 /* Is the regulator on? */
546 ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
550 return REGULATOR_STATUS_ON;
552 return REGULATOR_STATUS_OFF;
555 static const struct regulator_ops wm831x_alive_ldo_ops = {
556 .list_voltage = regulator_list_voltage_linear,
557 .map_voltage = regulator_map_voltage_linear,
558 .get_voltage_sel = regulator_get_voltage_sel_regmap,
559 .set_voltage_sel = regulator_set_voltage_sel_regmap,
560 .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
561 .get_status = wm831x_alive_ldo_get_status,
563 .is_enabled = regulator_is_enabled_regmap,
564 .enable = regulator_enable_regmap,
565 .disable = regulator_disable_regmap,
568 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
570 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
571 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
572 struct regulator_config config = { };
574 struct wm831x_ldo *ldo;
575 struct resource *res;
578 if (pdata && pdata->wm831x_num)
579 id = (pdata->wm831x_num * 10) + 1;
585 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
587 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
591 ldo->wm831x = wm831x;
593 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
595 dev_err(&pdev->dev, "No REG resource\n");
599 ldo->base = res->start;
601 snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
602 ldo->desc.name = ldo->name;
604 snprintf(ldo->supply_name, sizeof(ldo->supply_name),
606 ldo->desc.supply_name = ldo->supply_name;
609 ldo->desc.type = REGULATOR_VOLTAGE;
610 ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
611 ldo->desc.ops = &wm831x_alive_ldo_ops;
612 ldo->desc.owner = THIS_MODULE;
613 ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
614 ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
615 ldo->desc.enable_reg = WM831X_LDO_ENABLE;
616 ldo->desc.enable_mask = 1 << id;
617 ldo->desc.min_uV = 800000;
618 ldo->desc.uV_step = 50000;
619 ldo->desc.enable_time = 1000;
621 config.dev = pdev->dev.parent;
623 config.init_data = pdata->ldo[id];
624 config.driver_data = ldo;
625 config.regmap = wm831x->regmap;
627 ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
629 if (IS_ERR(ldo->regulator)) {
630 ret = PTR_ERR(ldo->regulator);
631 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
636 platform_set_drvdata(pdev, ldo);
644 static struct platform_driver wm831x_alive_ldo_driver = {
645 .probe = wm831x_alive_ldo_probe,
647 .name = "wm831x-alive-ldo",
651 static struct platform_driver * const drivers[] = {
652 &wm831x_gp_ldo_driver,
654 &wm831x_alive_ldo_driver,
657 static int __init wm831x_ldo_init(void)
659 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
661 subsys_initcall(wm831x_ldo_init);
663 static void __exit wm831x_ldo_exit(void)
665 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
667 module_exit(wm831x_ldo_exit);
669 /* Module information */
670 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
671 MODULE_DESCRIPTION("WM831x LDO driver");
672 MODULE_LICENSE("GPL");
673 MODULE_ALIAS("platform:wm831x-ldo");
674 MODULE_ALIAS("platform:wm831x-aldo");
675 MODULE_ALIAS("platform:wm831x-aliveldo");