[deliverable/linux.git] / drivers / power / tps65090-charger.c

/*
 * Battery charger driver for TI's tps65090
 *
 * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.

 * 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/>.
 */
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/tps65090.h>

#define TPS65090_REG_INTR_STS	0x00
#define TPS65090_REG_CG_CTRL0	0x04
#define TPS65090_REG_CG_CTRL1	0x05
#define TPS65090_REG_CG_CTRL2	0x06
#define TPS65090_REG_CG_CTRL3	0x07
#define TPS65090_REG_CG_CTRL4	0x08
#define TPS65090_REG_CG_CTRL5	0x09
#define TPS65090_REG_CG_STATUS1	0x0a
#define TPS65090_REG_CG_STATUS2	0x0b

#define TPS65090_CHARGER_ENABLE	BIT(0)
#define TPS65090_VACG		BIT(1)
#define TPS65090_NOITERM	BIT(5)

struct tps65090_charger {
	struct	device	*dev;
	int	ac_online;
	int	prev_ac_online;
	int	irq;
	struct power_supply	ac;
	struct tps65090_platform_data *pdata;
};

static enum power_supply_property tps65090_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static int tps65090_low_chrg_current(struct tps65090_charger *charger)
{
	int ret;

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
			TPS65090_NOITERM);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
			__func__, TPS65090_REG_CG_CTRL5);
		return ret;
	}
	return 0;
}

static int tps65090_enable_charging(struct tps65090_charger *charger,
	uint8_t enable)
{
	int ret;
	uint8_t ctrl0 = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
			    &ctrl0);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
				__func__, TPS65090_REG_CG_CTRL0);
		return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
				(ctrl0 | TPS65090_CHARGER_ENABLE));
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
				__func__, TPS65090_REG_CG_CTRL0);
		return ret;
	}
	return 0;
}

static int tps65090_config_charger(struct tps65090_charger *charger)
{
	int ret;

	if (charger->pdata->enable_low_current_chrg) {
		ret = tps65090_low_chrg_current(charger);
		if (ret < 0) {
			dev_err(charger->dev,
				"error configuring low charge current\n");
			return ret;
		}
	}

	return 0;
}

static int tps65090_ac_get_property(struct power_supply *psy,
			enum power_supply_property psp,
			union power_supply_propval *val)
{
	struct tps65090_charger *charger = container_of(psy,
					struct tps65090_charger, ac);

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

static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
{
	struct tps65090_charger *charger = dev_id;
	int ret;
	uint8_t status1 = 0;
	uint8_t intrsts = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
			    &status1);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
				__func__, TPS65090_REG_CG_STATUS1);
		return IRQ_HANDLED;
	}
	msleep(75);
	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
			    &intrsts);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
				__func__, TPS65090_REG_INTR_STS);
		return IRQ_HANDLED;
	}

	if (intrsts & TPS65090_VACG) {
		ret = tps65090_enable_charging(charger, 1);
		if (ret < 0)
			return IRQ_HANDLED;
		charger->ac_online = 1;
	} else {
		charger->ac_online = 0;
	}

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

	return IRQ_HANDLED;
}

#if defined(CONFIG_OF)

#include <linux/of_device.h>

static struct tps65090_platform_data *
		tps65090_parse_dt_charger_data(struct platform_device *pdev)
{
	struct tps65090_platform_data *pdata;
	struct device_node *np = pdev->dev.parent->of_node;
	unsigned int prop;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
		return NULL;
	}

	prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
	pdata->enable_low_current_chrg = prop;

	pdata->irq_base = -1;

	return pdata;

}
#else
static struct tps65090_platform_data *
		tps65090_parse_dt_charger_data(struct platform_device *pdev)
{
	return NULL;
}
#endif

static int tps65090_charger_probe(struct platform_device *pdev)
{
	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
	struct tps65090_charger *cdata;
	struct tps65090_platform_data *pdata;
	uint8_t status1 = 0;
	int ret;
	int irq;

	pdata = dev_get_platdata(pdev->dev.parent);

	if (!pdata && tps65090_mfd->dev->of_node)
		pdata = tps65090_parse_dt_charger_data(pdev);

	if (!pdata) {
		dev_err(&pdev->dev, "%s():no platform data available\n",
				__func__);
		return -ENODEV;
	}

	cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
	if (!cdata) {
		dev_err(&pdev->dev, "failed to allocate memory status\n");
		return -ENOMEM;
	}

	dev_set_drvdata(&pdev->dev, cdata);

	cdata->dev			= &pdev->dev;
	cdata->pdata			= pdata;

	cdata->ac.name			= "tps65090-ac";
	cdata->ac.type			= POWER_SUPPLY_TYPE_MAINS;
	cdata->ac.get_property		= tps65090_ac_get_property;
	cdata->ac.properties		= tps65090_ac_props;
	cdata->ac.num_properties	= ARRAY_SIZE(tps65090_ac_props);
	cdata->ac.supplied_to		= pdata->supplied_to;
	cdata->ac.num_supplicants	= pdata->num_supplicants;

	ret = power_supply_register(&pdev->dev, &cdata->ac);
	if (ret) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		return ret;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
		ret = irq;
		goto fail_unregister_supply;
	}

	cdata->irq = irq;

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
		tps65090_charger_isr, 0, "tps65090-charger", cdata);
	if (ret) {
		dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
			ret);
		goto fail_free_irq;
	}

	ret = tps65090_config_charger(cdata);
	if (ret < 0) {
		dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
		goto fail_free_irq;
	}

	/* Check for charger presence */
	ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
			&status1);
	if (ret < 0) {
		dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
			TPS65090_REG_CG_STATUS1);
		goto fail_free_irq;
	}

	if (status1 != 0) {
		ret = tps65090_enable_charging(cdata, 1);
		if (ret < 0) {
			dev_err(cdata->dev, "error enabling charger\n");
			goto fail_free_irq;
		}
		cdata->ac_online = 1;
		power_supply_changed(&cdata->ac);
	}

	return 0;

fail_free_irq:
	devm_free_irq(cdata->dev, irq, cdata);
fail_unregister_supply:
	power_supply_unregister(&cdata->ac);

	return ret;
}

static int tps65090_charger_remove(struct platform_device *pdev)
{
	struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev);

	devm_free_irq(cdata->dev, cdata->irq, cdata);
	power_supply_unregister(&cdata->ac);

	return 0;
}

static struct platform_driver tps65090_charger_driver = {
	.driver	= {
		.name	= "tps65090-charger",
		.owner	= THIS_MODULE,
	},
	.probe	= tps65090_charger_probe,
	.remove = tps65090_charger_remove,
};
module_platform_driver(tps65090_charger_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
MODULE_DESCRIPTION("tps65090 battery charger driver");
Commit	Line	Data
6f8da5df RK	1	/*
	2	* Battery charger driver for TI's tps65090
	3	*
	4	* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
	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	#include <linux/err.h>
	19	#include <linux/init.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/slab.h>
	24	#include <linux/delay.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/power_supply.h>
	27	#include <linux/mfd/tps65090.h>
	28
	29	#define TPS65090_REG_INTR_STS 0x00
	30	#define TPS65090_REG_CG_CTRL0 0x04
	31	#define TPS65090_REG_CG_CTRL1 0x05
	32	#define TPS65090_REG_CG_CTRL2 0x06
	33	#define TPS65090_REG_CG_CTRL3 0x07
	34	#define TPS65090_REG_CG_CTRL4 0x08
	35	#define TPS65090_REG_CG_CTRL5 0x09
	36	#define TPS65090_REG_CG_STATUS1 0x0a
	37	#define TPS65090_REG_CG_STATUS2 0x0b
	38
	39	#define TPS65090_CHARGER_ENABLE BIT(0)
	40	#define TPS65090_VACG BIT(1)
	41	#define TPS65090_NOITERM BIT(5)
	42
	43	struct tps65090_charger {
	44	struct device *dev;
	45	int ac_online;
	46	int prev_ac_online;
	47	int irq;
	48	struct power_supply ac;
	49	struct tps65090_platform_data *pdata;
	50	};
	51
	52	static enum power_supply_property tps65090_ac_props[] = {
	53	POWER_SUPPLY_PROP_ONLINE,
	54	};
	55
	56	static int tps65090_low_chrg_current(struct tps65090_charger *charger)
	57	{
	58	int ret;
	59
	60	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
	61	TPS65090_NOITERM);
	62	if (ret < 0) {
	63	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
	64	__func__, TPS65090_REG_CG_CTRL5);
65	return ret;
66	}
67	return 0;
68	}
69
70	static int tps65090_enable_charging(struct tps65090_charger *charger,
71	uint8_t enable)
72	{
73	int ret;
74	uint8_t ctrl0 = 0;
75
76	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
77	&ctrl0);
78	if (ret < 0) {
79	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
80	__func__, TPS65090_REG_CG_CTRL0);
81	return ret;
82	}
83
84	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
85	(ctrl0 \| TPS65090_CHARGER_ENABLE));
86	if (ret < 0) {
87	dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
88	__func__, TPS65090_REG_CG_CTRL0);
89	return ret;
90	}
91	return 0;
92	}
93
94	static int tps65090_config_charger(struct tps65090_charger *charger)
95	{
96	int ret;
97
98	if (charger->pdata->enable_low_current_chrg) {
99	ret = tps65090_low_chrg_current(charger);
100	if (ret < 0) {
101	dev_err(charger->dev,
102	"error configuring low charge current\n");
103	return ret;
104	}
105	}
106
107	return 0;
108	}
109
110	static int tps65090_ac_get_property(struct power_supply *psy,
111	enum power_supply_property psp,
112	union power_supply_propval *val)
113	{
114	struct tps65090_charger *charger = container_of(psy,
115	struct tps65090_charger, ac);
116
117	if (psp == POWER_SUPPLY_PROP_ONLINE) {
118	val->intval = charger->ac_online;
119	charger->prev_ac_online = charger->ac_online;
120	return 0;
121	}
122	return -EINVAL;
123	}
124
125	static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
126	{
127	struct tps65090_charger *charger = dev_id;
128	int ret;
129	uint8_t status1 = 0;
130	uint8_t intrsts = 0;
131
132	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
133	&status1);
134	if (ret < 0) {
135	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
136	__func__, TPS65090_REG_CG_STATUS1);
137	return IRQ_HANDLED;
138	}
139	msleep(75);
140	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
141	&intrsts);
142	if (ret < 0) {
143	dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
144	__func__, TPS65090_REG_INTR_STS);
145	return IRQ_HANDLED;
146	}
147
148	if (intrsts & TPS65090_VACG) {
149	ret = tps65090_enable_charging(charger, 1);
150	if (ret < 0)
151	return IRQ_HANDLED;
152	charger->ac_online = 1;
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	return IRQ_HANDLED;
161	}
162
163	#if defined(CONFIG_OF)
164
165	#include <linux/of_device.h>
166
167	static struct tps65090_platform_data *
168	tps65090_parse_dt_charger_data(struct platform_device *pdev)
169	{
170	struct tps65090_platform_data *pdata;
171	struct device_node *np = pdev->dev.parent->of_node;
172	unsigned int prop;
173
174	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
175	if (!pdata) {
176	dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
177	return NULL;
178	}
179
180	prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
181	pdata->enable_low_current_chrg = prop;
182
183	pdata->irq_base = -1;
184
185	return pdata;
186
187	}
188	#else
189	static struct tps65090_platform_data *
190	tps65090_parse_dt_charger_data(struct platform_device *pdev)
191	{
192	return NULL;
193	}
194	#endif
195
196	static int tps65090_charger_probe(struct platform_device *pdev)
197	{
198	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
199	struct tps65090_charger *cdata;
200	struct tps65090_platform_data *pdata;
201	uint8_t status1 = 0;
202	int ret;
203	int irq;
204
205	pdata = dev_get_platdata(pdev->dev.parent);
206
207	if (!pdata && tps65090_mfd->dev->of_node)
208	pdata = tps65090_parse_dt_charger_data(pdev);
209
210	if (!pdata) {
211	dev_err(&pdev->dev, "%s():no platform data available\n",
212	__func__);
213	return -ENODEV;
214	}
215
216	cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
217	if (!cdata) {
218	dev_err(&pdev->dev, "failed to allocate memory status\n");
219	return -ENOMEM;
220	}
221
222	dev_set_drvdata(&pdev->dev, cdata);
223
224	cdata->dev = &pdev->dev;
225	cdata->pdata = pdata;
226
227	cdata->ac.name = "tps65090-ac";
228	cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
229	cdata->ac.get_property = tps65090_ac_get_property;
230	cdata->ac.properties = tps65090_ac_props;
231	cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
232	cdata->ac.supplied_to = pdata->supplied_to;
233	cdata->ac.num_supplicants = pdata->num_supplicants;
234
235	ret = power_supply_register(&pdev->dev, &cdata->ac);
236	if (ret) {
237	dev_err(&pdev->dev, "failed: power supply register\n");
238	return ret;
239	}
240
241	irq = platform_get_irq(pdev, 0);
242	if (irq <= 0) {
243	dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
244	ret = irq;
245	goto fail_unregister_supply;
246	}
247
248	cdata->irq = irq;
249
250	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
251	tps65090_charger_isr, 0, "tps65090-charger", cdata);
252	if (ret) {
253	dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
254	ret);
255	goto fail_free_irq;
256	}
257
258	ret = tps65090_config_charger(cdata);
259	if (ret < 0) {
260	dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
261	goto fail_free_irq;
262	}
263
264	/* Check for charger presence */
265	ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
266	&status1);
267	if (ret < 0) {
268	dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
269	TPS65090_REG_CG_STATUS1);
270	goto fail_free_irq;
271	}
272
273	if (status1 != 0) {
274	ret = tps65090_enable_charging(cdata, 1);
275	if (ret < 0) {
276	dev_err(cdata->dev, "error enabling charger\n");
277	goto fail_free_irq;
278	}
279	cdata->ac_online = 1;
280	power_supply_changed(&cdata->ac);
281	}
282
283	return 0;
284
285	fail_free_irq:
286	devm_free_irq(cdata->dev, irq, cdata);
287	fail_unregister_supply:
288	power_supply_unregister(&cdata->ac);
289
290	return ret;
291	}
292
293	static int tps65090_charger_remove(struct platform_device *pdev)
294	{
295	struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev);
296
297	devm_free_irq(cdata->dev, cdata->irq, cdata);
298	power_supply_unregister(&cdata->ac);
299
300	return 0;
301	}
302
303	static struct platform_driver tps65090_charger_driver = {
304	.driver = {
305	.name = "tps65090-charger",
306	.owner = THIS_MODULE,
307	},
308	.probe = tps65090_charger_probe,
309	.remove = tps65090_charger_remove,
310	};
311	module_platform_driver(tps65090_charger_driver);
312
313	MODULE_LICENSE("GPL v2");
314	MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
315	MODULE_DESCRIPTION("tps65090 battery charger driver");