[linux-2.6-block.git] / drivers / power / tps65217_charger.c

/*
 * Battery charger driver for TI's tps65217
 *
 * Copyright (c) 2015, Collabora Ltd.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Battery charger driver for TI's tps65217
 */
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/power_supply.h>

#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>

#define POLL_INTERVAL		(HZ * 2)

struct tps65217_charger {
	struct tps65217 *tps;
	struct device *dev;
	struct power_supply *ac;

	int	ac_online;
	int	prev_ac_online;

	struct task_struct	*poll_task;
};

static enum power_supply_property tps65217_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static int tps65217_config_charger(struct tps65217_charger *charger)
{
	int ret;

	dev_dbg(charger->dev, "%s\n", __func__);

	/*
	 * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
	 *
	 * The device can be configured to support a 100k NTC (B = 3960) by
	 * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
	 * is not recommended to do so. In sleep mode, the charger continues
	 * charging the battery, but all register values are reset to default
	 * values. Therefore, the charger would get the wrong temperature
	 * information. If 100k NTC setting is required, please contact the
	 * factory.
	 *
	 * ATTENTION, conflicting information, from p. 46
	 *
	 * NTC TYPE (for battery temperature measurement)
	 *   0 – 100k (curve 1, B = 3960)
	 *   1 – 10k  (curve 2, B = 3480) (default on reset)
	 *
	 */
	ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
				  TPS65217_CHGCONFIG1_NTC_TYPE,
				  TPS65217_PROTECT_NONE);
	if (ret) {
		dev_err(charger->dev,
			"failed to set 100k NTC setting: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tps65217_enable_charging(struct tps65217_charger *charger)
{
	int ret;

	/* charger already enabled */
	if (charger->ac_online)
		return 0;

	dev_dbg(charger->dev, "%s: enable charging\n", __func__);
	ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
				TPS65217_CHGCONFIG1_CHG_EN,
				TPS65217_CHGCONFIG1_CHG_EN,
				TPS65217_PROTECT_NONE);
	if (ret) {
		dev_err(charger->dev,
			"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
			__func__, TPS65217_REG_CHGCONFIG1, ret);
		return ret;
	}

	charger->ac_online = 1;

	return 0;
}

static int tps65217_ac_get_property(struct power_supply *psy,
			enum power_supply_property psp,
			union power_supply_propval *val)
{
	struct tps65217_charger *charger = power_supply_get_drvdata(psy);

	if (psp == POWER_SUPPLY_PROP_ONLINE) {
		val->intval = charger->ac_online;
		return 0;
	}
	return -EINVAL;
}

static irqreturn_t tps65217_charger_irq(int irq, void *dev)
{
	int ret, val;
	struct tps65217_charger *charger = dev;

	charger->prev_ac_online = charger->ac_online;

	ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
	if (ret < 0) {
		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
			__func__, TPS65217_REG_STATUS);
		return IRQ_HANDLED;
	}

	dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);

	/* check for AC status bit */
	if (val & TPS65217_STATUS_ACPWR) {
		ret = tps65217_enable_charging(charger);
		if (ret) {
			dev_err(charger->dev,
				"failed to enable charger: %d\n", ret);
			return IRQ_HANDLED;
		}
	} else {
		charger->ac_online = 0;
	}

	if (charger->prev_ac_online != charger->ac_online)
		power_supply_changed(charger->ac);

	ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
	if (ret < 0) {
		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
			__func__, TPS65217_REG_CHGCONFIG0);
		return IRQ_HANDLED;
	}

	if (val & TPS65217_CHGCONFIG0_ACTIVE)
		dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
	else
		dev_dbg(charger->dev,
			"%s: charger is NOT charging\n", __func__);

	return IRQ_HANDLED;
}

static int tps65217_charger_poll_task(void *data)
{
	set_freezable();

	while (!kthread_should_stop()) {
		schedule_timeout_interruptible(POLL_INTERVAL);
		try_to_freeze();
		tps65217_charger_irq(-1, data);
	}
	return 0;
}

static const struct power_supply_desc tps65217_charger_desc = {
	.name			= "tps65217-ac",
	.type			= POWER_SUPPLY_TYPE_MAINS,
	.get_property		= tps65217_ac_get_property,
	.properties		= tps65217_ac_props,
	.num_properties		= ARRAY_SIZE(tps65217_ac_props),
};

static int tps65217_charger_probe(struct platform_device *pdev)
{
	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
	struct tps65217_charger *charger;
	int ret;

	dev_dbg(&pdev->dev, "%s\n", __func__);

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

	charger->tps = tps;
	charger->dev = &pdev->dev;

	charger->ac = devm_power_supply_register(&pdev->dev,
						 &tps65217_charger_desc,
						 NULL);
	if (IS_ERR(charger->ac)) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		return PTR_ERR(charger->ac);
	}

	ret = tps65217_config_charger(charger);
	if (ret < 0) {
		dev_err(charger->dev, "charger config failed, err %d\n", ret);
		return ret;
	}

	charger->poll_task = kthread_run(tps65217_charger_poll_task,
				      charger, "ktps65217charger");
	if (IS_ERR(charger->poll_task)) {
		ret = PTR_ERR(charger->poll_task);
		dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
		return ret;
	}

	return 0;
}

static int tps65217_charger_remove(struct platform_device *pdev)
{
	struct tps65217_charger *charger = platform_get_drvdata(pdev);

	kthread_stop(charger->poll_task);

	return 0;
}

static const struct of_device_id tps65217_charger_match_table[] = {
	{ .compatible = "ti,tps65217-charger", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);

static struct platform_driver tps65217_charger_driver = {
	.probe	= tps65217_charger_probe,
	.remove = tps65217_charger_remove,
	.driver	= {
		.name	= "tps65217-charger",
		.of_match_table = of_match_ptr(tps65217_charger_match_table),
	},

};
module_platform_driver(tps65217_charger_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
MODULE_DESCRIPTION("TPS65217 battery charger driver");
Commit	Line	Data
3636859b EBS	1	/*
	2	* Battery charger driver for TI's tps65217
	3	*
	4	* Copyright (c) 2015, Collabora Ltd.
	5
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	/*
	20	* Battery charger driver for TI's tps65217
	21	*/
	22	#include <linux/kernel.h>
	23	#include <linux/kthread.h>
	24	#include <linux/device.h>
	25	#include <linux/module.h>
	26	#include <linux/platform_device.h>
	27	#include <linux/init.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/slab.h>
	30	#include <linux/err.h>
	31	#include <linux/of.h>
	32	#include <linux/of_device.h>
	33	#include <linux/power_supply.h>
	34
	35	#include <linux/mfd/core.h>
	36	#include <linux/mfd/tps65217.h>
	37
	38	#define POLL_INTERVAL (HZ * 2)
	39
	40	struct tps65217_charger {
	41	struct tps65217 *tps;
	42	struct device *dev;
	43	struct power_supply *ac;
	44
	45	int ac_online;
	46	int prev_ac_online;
	47
	48	struct task_struct *poll_task;
	49	};
	50
	51	static enum power_supply_property tps65217_ac_props[] = {
	52	POWER_SUPPLY_PROP_ONLINE,
	53	};
	54
	55	static int tps65217_config_charger(struct tps65217_charger *charger)
	56	{
	57	int ret;
	58
	59	dev_dbg(charger->dev, "%s\n", __func__);
	60
	61	/*
	62	* tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
	63	*
	64	* The device can be configured to support a 100k NTC (B = 3960) by
65	* setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
66	* is not recommended to do so. In sleep mode, the charger continues
67	* charging the battery, but all register values are reset to default
68	* values. Therefore, the charger would get the wrong temperature
69	* information. If 100k NTC setting is required, please contact the
70	* factory.
71	*
72	* ATTENTION, conflicting information, from p. 46
73	*
74	* NTC TYPE (for battery temperature measurement)
75	* 0 – 100k (curve 1, B = 3960)
76	* 1 – 10k (curve 2, B = 3480) (default on reset)
77	*
78	*/
79	ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
80	TPS65217_CHGCONFIG1_NTC_TYPE,
81	TPS65217_PROTECT_NONE);
82	if (ret) {
83	dev_err(charger->dev,
84	"failed to set 100k NTC setting: %d\n", ret);
85	return ret;
86	}
87
88	return 0;
89	}
90
91	static int tps65217_enable_charging(struct tps65217_charger *charger)
92	{
93	int ret;
94
95	/* charger already enabled */
96	if (charger->ac_online)
97	return 0;
98
99	dev_dbg(charger->dev, "%s: enable charging\n", __func__);
100	ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
101	TPS65217_CHGCONFIG1_CHG_EN,
102	TPS65217_CHGCONFIG1_CHG_EN,
103	TPS65217_PROTECT_NONE);
104	if (ret) {
105	dev_err(charger->dev,
106	"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
107	__func__, TPS65217_REG_CHGCONFIG1, ret);
108	return ret;
109	}
110
111	charger->ac_online = 1;
112
113	return 0;
114	}
115
116	static int tps65217_ac_get_property(struct power_supply *psy,
117	enum power_supply_property psp,
118	union power_supply_propval *val)
119	{
120	struct tps65217_charger *charger = power_supply_get_drvdata(psy);
121
122	if (psp == POWER_SUPPLY_PROP_ONLINE) {
123	val->intval = charger->ac_online;
124	return 0;
125	}
126	return -EINVAL;
127	}
128
129	static irqreturn_t tps65217_charger_irq(int irq, void *dev)
130	{
131	int ret, val;
132	struct tps65217_charger *charger = dev;
133
134	charger->prev_ac_online = charger->ac_online;
135
136	ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
137	if (ret < 0) {
138	dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
139	__func__, TPS65217_REG_STATUS);
140	return IRQ_HANDLED;
141	}
142
143	dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
144
145	/* check for AC status bit */
146	if (val & TPS65217_STATUS_ACPWR) {
147	ret = tps65217_enable_charging(charger);
148	if (ret) {
149	dev_err(charger->dev,
150	"failed to enable charger: %d\n", ret);
151	return IRQ_HANDLED;
152	}
153	} else {
154	charger->ac_online = 0;
155	}
156
157	if (charger->prev_ac_online != charger->ac_online)
158	power_supply_changed(charger->ac);
159
160	ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
161	if (ret < 0) {
162	dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
163	__func__, TPS65217_REG_CHGCONFIG0);
164	return IRQ_HANDLED;
165	}
166
167	if (val & TPS65217_CHGCONFIG0_ACTIVE)
168	dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
169	else
170	dev_dbg(charger->dev,
171	"%s: charger is NOT charging\n", __func__);
172
173	return IRQ_HANDLED;
174	}
175
176	static int tps65217_charger_poll_task(void *data)
177	{
178	set_freezable();
179
180	while (!kthread_should_stop()) {
181	schedule_timeout_interruptible(POLL_INTERVAL);
182	try_to_freeze();
183	tps65217_charger_irq(-1, data);
184	}
185	return 0;
186	}
187
188	static const struct power_supply_desc tps65217_charger_desc = {
189	.name = "tps65217-ac",
190	.type = POWER_SUPPLY_TYPE_MAINS,
191	.get_property = tps65217_ac_get_property,
192	.properties = tps65217_ac_props,
193	.num_properties = ARRAY_SIZE(tps65217_ac_props),
194	};
195
196	static int tps65217_charger_probe(struct platform_device *pdev)
197	{
198	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
199	struct tps65217_charger *charger;
200	int ret;
201
202	dev_dbg(&pdev->dev, "%s\n", __func__);
203
204	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
205	if (!charger)
206	return -ENOMEM;
207
208	charger->tps = tps;
209	charger->dev = &pdev->dev;
210
211	charger->ac = devm_power_supply_register(&pdev->dev,
212	&tps65217_charger_desc,
213	NULL);
214	if (IS_ERR(charger->ac)) {
215	dev_err(&pdev->dev, "failed: power supply register\n");
216	return PTR_ERR(charger->ac);
217	}
218
219	ret = tps65217_config_charger(charger);
220	if (ret < 0) {
221	dev_err(charger->dev, "charger config failed, err %d\n", ret);
222	return ret;
223	}
224
225	charger->poll_task = kthread_run(tps65217_charger_poll_task,
226	charger, "ktps65217charger");
227	if (IS_ERR(charger->poll_task)) {
228	ret = PTR_ERR(charger->poll_task);
229	dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
230	return ret;
231	}
232
233	return 0;
234	}
235
236	static int tps65217_charger_remove(struct platform_device *pdev)
237	{
238	struct tps65217_charger *charger = platform_get_drvdata(pdev);
239
240	kthread_stop(charger->poll_task);
241
242	return 0;
243	}
244
245	static const struct of_device_id tps65217_charger_match_table[] = {
246	{ .compatible = "ti,tps65217-charger", },
247	{ /* sentinel */ }
248	};
249	MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
250
251	static struct platform_driver tps65217_charger_driver = {
252	.probe = tps65217_charger_probe,
253	.remove = tps65217_charger_remove,
254	.driver = {
255	.name = "tps65217-charger",
256	.of_match_table = of_match_ptr(tps65217_charger_match_table),
257	},
258
259	};
260	module_platform_driver(tps65217_charger_driver);
261
262	MODULE_LICENSE("GPL v2");
263	MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
264	MODULE_DESCRIPTION("TPS65217 battery charger driver");