[linux-2.6-block.git] / drivers / power / supply / ltc3651-charger.c

/*
 *  Copyright (C) 2017, Topic Embedded Products
 *  Driver for LTC3651 charger IC.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 */

#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/of.h>

struct ltc3651_charger {
	struct power_supply *charger;
	struct power_supply_desc charger_desc;
	struct gpio_desc *acpr_gpio;
	struct gpio_desc *fault_gpio;
	struct gpio_desc *chrg_gpio;
};

static irqreturn_t ltc3651_charger_irq(int irq, void *devid)
{
	struct power_supply *charger = devid;

	power_supply_changed(charger);

	return IRQ_HANDLED;
}

static inline struct ltc3651_charger *psy_to_ltc3651_charger(
	struct power_supply *psy)
{
	return power_supply_get_drvdata(psy);
}

static int ltc3651_charger_get_property(struct power_supply *psy,
		enum power_supply_property psp, union power_supply_propval *val)
{
	struct ltc3651_charger *ltc3651_charger = psy_to_ltc3651_charger(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (!ltc3651_charger->chrg_gpio) {
			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
			break;
		}
		if (gpiod_get_value(ltc3651_charger->chrg_gpio))
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = gpiod_get_value(ltc3651_charger->acpr_gpio);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		if (!ltc3651_charger->fault_gpio) {
			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
			break;
		}
		if (!gpiod_get_value(ltc3651_charger->fault_gpio)) {
			val->intval = POWER_SUPPLY_HEALTH_GOOD;
			break;
		}
		/*
		 * If the fault pin is active, the chrg pin explains the type
		 * of failure.
		 */
		if (!ltc3651_charger->chrg_gpio) {
			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
			break;
		}
		val->intval = gpiod_get_value(ltc3651_charger->chrg_gpio) ?
				POWER_SUPPLY_HEALTH_OVERHEAT :
				POWER_SUPPLY_HEALTH_DEAD;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static enum power_supply_property ltc3651_charger_properties[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_HEALTH,
};

static int ltc3651_charger_probe(struct platform_device *pdev)
{
	struct power_supply_config psy_cfg = {};
	struct ltc3651_charger *ltc3651_charger;
	struct power_supply_desc *charger_desc;
	int ret;

	ltc3651_charger = devm_kzalloc(&pdev->dev, sizeof(*ltc3651_charger),
					GFP_KERNEL);
	if (!ltc3651_charger)
		return -ENOMEM;

	ltc3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
					"lltc,acpr", GPIOD_IN);
	if (IS_ERR(ltc3651_charger->acpr_gpio)) {
		ret = PTR_ERR(ltc3651_charger->acpr_gpio);
		dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
		return ret;
	}
	ltc3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
					"lltc,fault", GPIOD_IN);
	if (IS_ERR(ltc3651_charger->fault_gpio)) {
		ret = PTR_ERR(ltc3651_charger->fault_gpio);
		dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
		return ret;
	}
	ltc3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
					"lltc,chrg", GPIOD_IN);
	if (IS_ERR(ltc3651_charger->chrg_gpio)) {
		ret = PTR_ERR(ltc3651_charger->chrg_gpio);
		dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
		return ret;
	}

	charger_desc = &ltc3651_charger->charger_desc;
	charger_desc->name = pdev->dev.of_node->name;
	charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
	charger_desc->properties = ltc3651_charger_properties;
	charger_desc->num_properties = ARRAY_SIZE(ltc3651_charger_properties);
	charger_desc->get_property = ltc3651_charger_get_property;
	psy_cfg.of_node = pdev->dev.of_node;
	psy_cfg.drv_data = ltc3651_charger;

	ltc3651_charger->charger = devm_power_supply_register(&pdev->dev,
						      charger_desc, &psy_cfg);
	if (IS_ERR(ltc3651_charger->charger)) {
		ret = PTR_ERR(ltc3651_charger->charger);
		dev_err(&pdev->dev, "Failed to register power supply: %d\n",
			ret);
		return ret;
	}

	/*
	 * Acquire IRQs for the GPIO pins if possible. If the system does not
	 * support IRQs on these pins, userspace will have to poll the sysfs
	 * files manually.
	 */
	if (ltc3651_charger->acpr_gpio) {
		ret = gpiod_to_irq(ltc3651_charger->acpr_gpio);
		if (ret >= 0)
			ret = devm_request_any_context_irq(&pdev->dev, ret,
				ltc3651_charger_irq,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				dev_name(&pdev->dev), ltc3651_charger->charger);
		if (ret < 0)
			dev_warn(&pdev->dev, "Failed to request acpr irq\n");
	}
	if (ltc3651_charger->fault_gpio) {
		ret = gpiod_to_irq(ltc3651_charger->fault_gpio);
		if (ret >= 0)
			ret = devm_request_any_context_irq(&pdev->dev, ret,
				ltc3651_charger_irq,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				dev_name(&pdev->dev), ltc3651_charger->charger);
		if (ret < 0)
			dev_warn(&pdev->dev, "Failed to request fault irq\n");
	}
	if (ltc3651_charger->chrg_gpio) {
		ret = gpiod_to_irq(ltc3651_charger->chrg_gpio);
		if (ret >= 0)
			ret = devm_request_any_context_irq(&pdev->dev, ret,
				ltc3651_charger_irq,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				dev_name(&pdev->dev), ltc3651_charger->charger);
		if (ret < 0)
			dev_warn(&pdev->dev, "Failed to request chrg irq\n");
	}

	platform_set_drvdata(pdev, ltc3651_charger);

	return 0;
}

static const struct of_device_id ltc3651_charger_match[] = {
	{ .compatible = "lltc,ltc3651-charger" },
	{ }
};
MODULE_DEVICE_TABLE(of, ltc3651_charger_match);

static struct platform_driver ltc3651_charger_driver = {
	.probe = ltc3651_charger_probe,
	.driver = {
		.name = "ltc3651-charger",
		.of_match_table = ltc3651_charger_match,
	},
};

module_platform_driver(ltc3651_charger_driver);

MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
MODULE_DESCRIPTION("Driver for LTC3651 charger");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ltc3651-charger");
Commit	Line	Data
c94d4ed0 ML	1	/*
	2	* Copyright (C) 2017, Topic Embedded Products
	3	* Driver for LTC3651 charger IC.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version.
	9	*/
	10
	11	#include <linux/device.h>
	12	#include <linux/gpio/consumer.h>
	13	#include <linux/init.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/power_supply.h>
	19	#include <linux/slab.h>
	20	#include <linux/of.h>
	21
	22	struct ltc3651_charger {
	23	struct power_supply *charger;
	24	struct power_supply_desc charger_desc;
	25	struct gpio_desc *acpr_gpio;
	26	struct gpio_desc *fault_gpio;
	27	struct gpio_desc *chrg_gpio;
	28	};
	29
	30	static irqreturn_t ltc3651_charger_irq(int irq, void *devid)
	31	{
	32	struct power_supply *charger = devid;
	33
	34	power_supply_changed(charger);
	35
	36	return IRQ_HANDLED;
	37	}
	38
	39	static inline struct ltc3651_charger *psy_to_ltc3651_charger(
	40	struct power_supply *psy)
	41	{
	42	return power_supply_get_drvdata(psy);
	43	}
	44
	45	static int ltc3651_charger_get_property(struct power_supply *psy,
	46	enum power_supply_property psp, union power_supply_propval *val)
	47	{
	48	struct ltc3651_charger *ltc3651_charger = psy_to_ltc3651_charger(psy);
	49
	50	switch (psp) {
	51	case POWER_SUPPLY_PROP_STATUS:
	52	if (!ltc3651_charger->chrg_gpio) {
	53	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
	54	break;
	55	}
	56	if (gpiod_get_value(ltc3651_charger->chrg_gpio))
	57	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	58	else
	59	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	60	break;
	61	case POWER_SUPPLY_PROP_ONLINE:
	62	val->intval = gpiod_get_value(ltc3651_charger->acpr_gpio);
	63	break;
	64	case POWER_SUPPLY_PROP_HEALTH:
65	if (!ltc3651_charger->fault_gpio) {
66	val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
67	break;
68	}
69	if (!gpiod_get_value(ltc3651_charger->fault_gpio)) {
70	val->intval = POWER_SUPPLY_HEALTH_GOOD;
71	break;
72	}
73	/*
74	* If the fault pin is active, the chrg pin explains the type
75	* of failure.
76	*/
77	if (!ltc3651_charger->chrg_gpio) {
78	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
79	break;
80	}
81	val->intval = gpiod_get_value(ltc3651_charger->chrg_gpio) ?
82	POWER_SUPPLY_HEALTH_OVERHEAT :
83	POWER_SUPPLY_HEALTH_DEAD;
84	break;
85	default:
86	return -EINVAL;
87	}
88
89	return 0;
90	}
91
92	static enum power_supply_property ltc3651_charger_properties[] = {
93	POWER_SUPPLY_PROP_STATUS,
94	POWER_SUPPLY_PROP_ONLINE,
95	POWER_SUPPLY_PROP_HEALTH,
96	};
97
98	static int ltc3651_charger_probe(struct platform_device *pdev)
99	{
100	struct power_supply_config psy_cfg = {};
101	struct ltc3651_charger *ltc3651_charger;
102	struct power_supply_desc *charger_desc;
103	int ret;
104
105	ltc3651_charger = devm_kzalloc(&pdev->dev, sizeof(*ltc3651_charger),
106	GFP_KERNEL);
107	if (!ltc3651_charger)
108	return -ENOMEM;
109
110	ltc3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
111	"lltc,acpr", GPIOD_IN);
112	if (IS_ERR(ltc3651_charger->acpr_gpio)) {
e1285417	113	ret = PTR_ERR(ltc3651_charger->acpr_gpio);
c94d4ed0 ML	114	dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
	115	return ret;
	116	}
	117	ltc3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
	118	"lltc,fault", GPIOD_IN);
	119	if (IS_ERR(ltc3651_charger->fault_gpio)) {
e1285417	120	ret = PTR_ERR(ltc3651_charger->fault_gpio);
c94d4ed0 ML	121	dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
	122	return ret;
	123	}
	124	ltc3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
	125	"lltc,chrg", GPIOD_IN);
	126	if (IS_ERR(ltc3651_charger->chrg_gpio)) {
e1285417	127	ret = PTR_ERR(ltc3651_charger->chrg_gpio);
c94d4ed0 ML	128	dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
	129	return ret;
	130	}
	131
	132	charger_desc = &ltc3651_charger->charger_desc;
	133	charger_desc->name = pdev->dev.of_node->name;
	134	charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
	135	charger_desc->properties = ltc3651_charger_properties;
	136	charger_desc->num_properties = ARRAY_SIZE(ltc3651_charger_properties);
	137	charger_desc->get_property = ltc3651_charger_get_property;
	138	psy_cfg.of_node = pdev->dev.of_node;
	139	psy_cfg.drv_data = ltc3651_charger;
	140
	141	ltc3651_charger->charger = devm_power_supply_register(&pdev->dev,
	142	charger_desc, &psy_cfg);
	143	if (IS_ERR(ltc3651_charger->charger)) {
	144	ret = PTR_ERR(ltc3651_charger->charger);
	145	dev_err(&pdev->dev, "Failed to register power supply: %d\n",
	146	ret);
	147	return ret;
	148	}
	149
	150	/*
	151	* Acquire IRQs for the GPIO pins if possible. If the system does not
	152	* support IRQs on these pins, userspace will have to poll the sysfs
	153	* files manually.
	154	*/
	155	if (ltc3651_charger->acpr_gpio) {
	156	ret = gpiod_to_irq(ltc3651_charger->acpr_gpio);
	157	if (ret >= 0)
	158	ret = devm_request_any_context_irq(&pdev->dev, ret,
	159	ltc3651_charger_irq,
	160	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	161	dev_name(&pdev->dev), ltc3651_charger->charger);
	162	if (ret < 0)
	163	dev_warn(&pdev->dev, "Failed to request acpr irq\n");
	164	}
	165	if (ltc3651_charger->fault_gpio) {
	166	ret = gpiod_to_irq(ltc3651_charger->fault_gpio);
	167	if (ret >= 0)
	168	ret = devm_request_any_context_irq(&pdev->dev, ret,
	169	ltc3651_charger_irq,
	170	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	171	dev_name(&pdev->dev), ltc3651_charger->charger);
	172	if (ret < 0)
	173	dev_warn(&pdev->dev, "Failed to request fault irq\n");
	174	}
	175	if (ltc3651_charger->chrg_gpio) {
	176	ret = gpiod_to_irq(ltc3651_charger->chrg_gpio);
	177	if (ret >= 0)
	178	ret = devm_request_any_context_irq(&pdev->dev, ret,
	179	ltc3651_charger_irq,
	180	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING,
	181	dev_name(&pdev->dev), ltc3651_charger->charger);
	182	if (ret < 0)
	183	dev_warn(&pdev->dev, "Failed to request chrg irq\n");
	184	}
	185
	186	platform_set_drvdata(pdev, ltc3651_charger);
	187
	188	return 0;
	189	}
	190
	191	static const struct of_device_id ltc3651_charger_match[] = {
192	{ .compatible = "lltc,ltc3651-charger" },
193	{ }
194	};
195	MODULE_DEVICE_TABLE(of, ltc3651_charger_match);
196
197	static struct platform_driver ltc3651_charger_driver = {
198	.probe = ltc3651_charger_probe,
199	.driver = {
200	.name = "ltc3651-charger",
201	.of_match_table = ltc3651_charger_match,
202	},
203	};
204
205	module_platform_driver(ltc3651_charger_driver);
206
207	MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
208	MODULE_DESCRIPTION("Driver for LTC3651 charger");
209	MODULE_LICENSE("GPL");
210	MODULE_ALIAS("platform:ltc3651-charger");