[mirror_ubuntu-focal-kernel.git] / drivers / regulator / wm831x-isink.c

// SPDX-License-Identifier: GPL-2.0+
//
// wm831x-isink.c  --  Current sink driver for the WM831x series
//
// Copyright 2009 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>

#define WM831X_ISINK_MAX_NAME 7

struct wm831x_isink {
	char name[WM831X_ISINK_MAX_NAME];
	struct regulator_desc desc;
	int reg;
	struct wm831x *wm831x;
	struct regulator_dev *regulator;
};

static int wm831x_isink_enable(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	/* We have a two stage enable: first start the ISINK... */
	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
			      WM831X_CS1_ENA);
	if (ret != 0)
		return ret;

	/* ...then enable drive */
	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
			      WM831X_CS1_DRIVE);
	if (ret != 0)
		wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);

	return ret;

}

static int wm831x_isink_disable(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
	if (ret < 0)
		return ret;

	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	if (ret < 0)
		return ret;

	return ret;

}

static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
{
	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = isink->wm831x;
	int ret;

	ret = wm831x_reg_read(wm831x, isink->reg);
	if (ret < 0)
		return ret;

	if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) ==
	    (WM831X_CS1_ENA | WM831X_CS1_DRIVE))
		return 1;
	else
		return 0;
}

static const struct regulator_ops wm831x_isink_ops = {
	.is_enabled = wm831x_isink_is_enabled,
	.enable = wm831x_isink_enable,
	.disable = wm831x_isink_disable,
	.set_current_limit = regulator_set_current_limit_regmap,
	.get_current_limit = regulator_get_current_limit_regmap,
};

static irqreturn_t wm831x_isink_irq(int irq, void *data)
{
	struct wm831x_isink *isink = data;

	regulator_lock(isink->regulator);
	regulator_notifier_call_chain(isink->regulator,
				      REGULATOR_EVENT_OVER_CURRENT,
				      NULL);
	regulator_unlock(isink->regulator);

	return IRQ_HANDLED;
}


static int wm831x_isink_probe(struct platform_device *pdev)
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
	struct wm831x_isink *isink;
	int id = pdev->id % ARRAY_SIZE(pdata->isink);
	struct regulator_config config = { };
	struct resource *res;
	int ret, irq;

	dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);

	if (pdata == NULL || pdata->isink[id] == NULL)
		return -ENODEV;

	isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
			     GFP_KERNEL);
	if (!isink)
		return -ENOMEM;

	isink->wm831x = wm831x;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "No REG resource\n");
		ret = -EINVAL;
		goto err;
	}
	isink->reg = res->start;

	/* For current parts this is correct; probably need to revisit
	 * in future.
	 */
	snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
	isink->desc.name = isink->name;
	isink->desc.id = id;
	isink->desc.ops = &wm831x_isink_ops;
	isink->desc.type = REGULATOR_CURRENT;
	isink->desc.owner = THIS_MODULE;
	isink->desc.curr_table = wm831x_isinkv_values,
	isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values),
	isink->desc.csel_reg = isink->reg,
	isink->desc.csel_mask = WM831X_CS1_ISEL_MASK,

	config.dev = pdev->dev.parent;
	config.init_data = pdata->isink[id];
	config.driver_data = isink;
	config.regmap = wm831x->regmap;

	isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
						   &config);
	if (IS_ERR(isink->regulator)) {
		ret = PTR_ERR(isink->regulator);
		dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
			id + 1, ret);
		goto err;
	}

	irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
					wm831x_isink_irq,
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					isink->name,
					isink);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
			irq, ret);
		goto err;
	}

	platform_set_drvdata(pdev, isink);

	return 0;

err:
	return ret;
}

static struct platform_driver wm831x_isink_driver = {
	.probe = wm831x_isink_probe,
	.driver		= {
		.name	= "wm831x-isink",
	},
};

static int __init wm831x_isink_init(void)
{
	int ret;
	ret = platform_driver_register(&wm831x_isink_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x ISINK driver: %d\n", ret);

	return ret;
}
subsys_initcall(wm831x_isink_init);

static void __exit wm831x_isink_exit(void)
{
	platform_driver_unregister(&wm831x_isink_driver);
}
module_exit(wm831x_isink_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown");
MODULE_DESCRIPTION("WM831x current sink driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-isink");
Commit	Line	Data
3cad5fc8 AL	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// wm831x-isink.c -- Current sink driver for the WM831x series
	4	//
	5	// Copyright 2009 Wolfson Microelectronics PLC.
	6	//
	7	// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
d4d6b722 MB	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>
5a0e3ad6	17	#include <linux/slab.h>
d4d6b722 MB	18
	19	#include <linux/mfd/wm831x/core.h>
	20	#include <linux/mfd/wm831x/regulator.h>
	21	#include <linux/mfd/wm831x/pdata.h>
	22
	23	#define WM831X_ISINK_MAX_NAME 7
	24
	25	struct wm831x_isink {
	26	char name[WM831X_ISINK_MAX_NAME];
	27	struct regulator_desc desc;
	28	int reg;
	29	struct wm831x *wm831x;
	30	struct regulator_dev *regulator;
	31	};
	32
	33	static int wm831x_isink_enable(struct regulator_dev *rdev)
	34	{
	35	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	36	struct wm831x *wm831x = isink->wm831x;
	37	int ret;
	38
	39	/* We have a two stage enable: first start the ISINK... */
	40	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA,
	41	WM831X_CS1_ENA);
	42	if (ret != 0)
	43	return ret;
	44
	45	/* ...then enable drive */
	46	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE,
	47	WM831X_CS1_DRIVE);
	48	if (ret != 0)
	49	wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	50
	51	return ret;
	52
	53	}
	54
	55	static int wm831x_isink_disable(struct regulator_dev *rdev)
	56	{
	57	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	58	struct wm831x *wm831x = isink->wm831x;
	59	int ret;
	60
	61	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0);
	62	if (ret < 0)
	63	return ret;
	64
	65	ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0);
	66	if (ret < 0)
	67	return ret;
	68
	69	return ret;
	70
	71	}
	72
	73	static int wm831x_isink_is_enabled(struct regulator_dev *rdev)
	74	{
	75	struct wm831x_isink *isink = rdev_get_drvdata(rdev);
	76	struct wm831x *wm831x = isink->wm831x;
	77	int ret;
	78
	79	ret = wm831x_reg_read(wm831x, isink->reg);
	80	if (ret < 0)
	81	return ret;
82
83	if ((ret & (WM831X_CS1_ENA \| WM831X_CS1_DRIVE)) ==
84	(WM831X_CS1_ENA \| WM831X_CS1_DRIVE))
85	return 1;
86	else
87	return 0;
88	}
89
b0d6dd3b	90	static const struct regulator_ops wm831x_isink_ops = {
d4d6b722 MB	91	.is_enabled = wm831x_isink_is_enabled,
	92	.enable = wm831x_isink_enable,
	93	.disable = wm831x_isink_disable,
d48acfd0 AL	94	.set_current_limit = regulator_set_current_limit_regmap,
d48acfd0 AL	95	.get_current_limit = regulator_get_current_limit_regmap,
d4d6b722 MB	96	};
	97
	98	static irqreturn_t wm831x_isink_irq(int irq, void *data)
	99	{
	100	struct wm831x_isink *isink = data;
	101
f7a62172	102	regulator_lock(isink->regulator);
d4d6b722 MB	103	regulator_notifier_call_chain(isink->regulator,
	104	REGULATOR_EVENT_OVER_CURRENT,
	105	NULL);
f7a62172	106	regulator_unlock(isink->regulator);
d4d6b722 MB	107
	108	return IRQ_HANDLED;
	109	}
	110
	111
a5023574	112	static int wm831x_isink_probe(struct platform_device *pdev)
d4d6b722 MB	113	{
d4d6b722 MB	114	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
dff91d0b	115	struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
d4d6b722 MB	116	struct wm831x_isink *isink;
d4d6b722 MB	117	int id = pdev->id % ARRAY_SIZE(pdata->isink);
c172708d	118	struct regulator_config config = { };
d4d6b722 MB	119	struct resource *res;
	120	int ret, irq;
	121
	122	dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1);
	123
	124	if (pdata == NULL \|\| pdata->isink[id] == NULL)
	125	return -ENODEV;
	126
fded2f4f MB	127	isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink),
fded2f4f MB	128	GFP_KERNEL);
d718debc	129	if (!isink)
d4d6b722	130	return -ENOMEM;
d4d6b722	131
e8092da9 MB	132	isink->wm831x = wm831x;
e8092da9 MB	133
5656098e	134	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
d4d6b722	135	if (res == NULL) {
5656098e	136	dev_err(&pdev->dev, "No REG resource\n");
d4d6b722 MB	137	ret = -EINVAL;
	138	goto err;
	139	}
	140	isink->reg = res->start;
	141
	142	/* For current parts this is correct; probably need to revisit
	143	* in future.
	144	*/
	145	snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1);
	146	isink->desc.name = isink->name;
	147	isink->desc.id = id;
	148	isink->desc.ops = &wm831x_isink_ops;
	149	isink->desc.type = REGULATOR_CURRENT;
	150	isink->desc.owner = THIS_MODULE;
d48acfd0 AL	151	isink->desc.curr_table = wm831x_isinkv_values,
	152	isink->desc.n_current_limits = ARRAY_SIZE(wm831x_isinkv_values),
	153	isink->desc.csel_reg = isink->reg,
	154	isink->desc.csel_mask = WM831X_CS1_ISEL_MASK,
d4d6b722	155
c172708d MB	156	config.dev = pdev->dev.parent;
	157	config.init_data = pdata->isink[id];
	158	config.driver_data = isink;
d48acfd0	159	config.regmap = wm831x->regmap;
c172708d	160
af151ded MB	161	isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc,
af151ded MB	162	&config);
d4d6b722 MB	163	if (IS_ERR(isink->regulator)) {
	164	ret = PTR_ERR(isink->regulator);
	165	dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n",
	166	id + 1, ret);
	167	goto err;
	168	}
	169
cd99758b	170	irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0));
63fb3149 MB	171	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
63fb3149 MB	172	wm831x_isink_irq,
29454738 FE	173	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
29454738 FE	174	isink->name,
63fb3149	175	isink);
d4d6b722 MB	176	if (ret != 0) {
	177	dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n",
	178	irq, ret);
af151ded	179	goto err;
d4d6b722 MB	180	}
	181
	182	platform_set_drvdata(pdev, isink);
	183
	184	return 0;
	185
d4d6b722	186	err:
d4d6b722 MB	187	return ret;
	188	}
	189
d4d6b722 MB	190	static struct platform_driver wm831x_isink_driver = {
d4d6b722 MB	191	.probe = wm831x_isink_probe,
d4d6b722 MB	192	.driver = {
	193	.name = "wm831x-isink",
	194	},
	195	};
	196
	197	static int __init wm831x_isink_init(void)
	198	{
	199	int ret;
	200	ret = platform_driver_register(&wm831x_isink_driver);
	201	if (ret != 0)
	202	pr_err("Failed to register WM831x ISINK driver: %d\n", ret);
	203
	204	return ret;
	205	}
	206	subsys_initcall(wm831x_isink_init);
	207
	208	static void __exit wm831x_isink_exit(void)
	209	{
	210	platform_driver_unregister(&wm831x_isink_driver);
	211	}
	212	module_exit(wm831x_isink_exit);
	213
	214	/* Module information */
	215	MODULE_AUTHOR("Mark Brown");
	216	MODULE_DESCRIPTION("WM831x current sink driver");
	217	MODULE_LICENSE("GPL");
	218	MODULE_ALIAS("platform:wm831x-isink");