max8903_charger.c revision 7e6d62db5efecded2dd4606ff2ff3726b9c52505 
1/*
2 * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
3 *
4 * Copyright (C) 2011 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 *
21 */
22
23#include <linux/gpio.h>
24#include <linux/interrupt.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/power_supply.h>
28#include <linux/platform_device.h>
29#include <linux/power/max8903_charger.h>
30
31struct max8903_data {
32	struct max8903_pdata pdata;
33	struct device *dev;
34	struct power_supply psy;
35	bool fault;
36	bool usb_in;
37	bool ta_in;
38};
39
40static enum power_supply_property max8903_charger_props[] = {
41	POWER_SUPPLY_PROP_STATUS, /* Charger status output */
42	POWER_SUPPLY_PROP_ONLINE, /* External power source */
43	POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
44};
45
46static int max8903_get_property(struct power_supply *psy,
47		enum power_supply_property psp,
48		union power_supply_propval *val)
49{
50	struct max8903_data *data = container_of(psy,
51			struct max8903_data, psy);
52
53	switch (psp) {
54	case POWER_SUPPLY_PROP_STATUS:
55		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
56		if (data->pdata.chg) {
57			if (gpio_get_value(data->pdata.chg) == 0)
58				val->intval = POWER_SUPPLY_STATUS_CHARGING;
59			else if (data->usb_in || data->ta_in)
60				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
61			else
62				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
63		}
64		break;
65	case POWER_SUPPLY_PROP_ONLINE:
66		val->intval = 0;
67		if (data->usb_in || data->ta_in)
68			val->intval = 1;
69		break;
70	case POWER_SUPPLY_PROP_HEALTH:
71		val->intval = POWER_SUPPLY_HEALTH_GOOD;
72		if (data->fault)
73			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
74		break;
75	default:
76		return -EINVAL;
77	}
78	return 0;
79}
80
81static irqreturn_t max8903_dcin(int irq, void *_data)
82{
83	struct max8903_data *data = _data;
84	struct max8903_pdata *pdata = &data->pdata;
85	bool ta_in;
86	enum power_supply_type old_type;
87
88	ta_in = gpio_get_value(pdata->dok) ? false : true;
89
90	if (ta_in == data->ta_in)
91		return IRQ_HANDLED;
92
93	data->ta_in = ta_in;
94
95	/* Set Current-Limit-Mode 1:DC 0:USB */
96	if (pdata->dcm)
97		gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
98
99	/* Charger Enable / Disable (cen is negated) */
100	if (pdata->cen)
101		gpio_set_value(pdata->cen, ta_in ? 0 :
102				(data->usb_in ? 0 : 1));
103
104	dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
105			"Connected" : "Disconnected");
106
107	old_type = data->psy.type;
108
109	if (data->ta_in)
110		data->psy.type = POWER_SUPPLY_TYPE_MAINS;
111	else if (data->usb_in)
112		data->psy.type = POWER_SUPPLY_TYPE_USB;
113	else
114		data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
115
116	if (old_type != data->psy.type)
117		power_supply_changed(&data->psy);
118
119	return IRQ_HANDLED;
120}
121
122static irqreturn_t max8903_usbin(int irq, void *_data)
123{
124	struct max8903_data *data = _data;
125	struct max8903_pdata *pdata = &data->pdata;
126	bool usb_in;
127	enum power_supply_type old_type;
128
129	usb_in = gpio_get_value(pdata->uok) ? false : true;
130
131	if (usb_in == data->usb_in)
132		return IRQ_HANDLED;
133
134	data->usb_in = usb_in;
135
136	/* Do not touch Current-Limit-Mode */
137
138	/* Charger Enable / Disable (cen is negated) */
139	if (pdata->cen)
140		gpio_set_value(pdata->cen, usb_in ? 0 :
141				(data->ta_in ? 0 : 1));
142
143	dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
144			"Connected" : "Disconnected");
145
146	old_type = data->psy.type;
147
148	if (data->ta_in)
149		data->psy.type = POWER_SUPPLY_TYPE_MAINS;
150	else if (data->usb_in)
151		data->psy.type = POWER_SUPPLY_TYPE_USB;
152	else
153		data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
154
155	if (old_type != data->psy.type)
156		power_supply_changed(&data->psy);
157
158	return IRQ_HANDLED;
159}
160
161static irqreturn_t max8903_fault(int irq, void *_data)
162{
163	struct max8903_data *data = _data;
164	struct max8903_pdata *pdata = &data->pdata;
165	bool fault;
166
167	fault = gpio_get_value(pdata->flt) ? false : true;
168
169	if (fault == data->fault)
170		return IRQ_HANDLED;
171
172	data->fault = fault;
173
174	if (fault)
175		dev_err(data->dev, "Charger suffers a fault and stops.\n");
176	else
177		dev_err(data->dev, "Charger recovered from a fault.\n");
178
179	return IRQ_HANDLED;
180}
181
182static __devinit int max8903_probe(struct platform_device *pdev)
183{
184	struct max8903_data *data;
185	struct device *dev = &pdev->dev;
186	struct max8903_pdata *pdata = pdev->dev.platform_data;
187	int ret = 0;
188	int gpio;
189	int ta_in = 0;
190	int usb_in = 0;
191
192	data = kzalloc(sizeof(struct max8903_data), GFP_KERNEL);
193	if (data == NULL) {
194		dev_err(dev, "Cannot allocate memory.\n");
195		return -ENOMEM;
196	}
197	memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
198	data->dev = dev;
199	platform_set_drvdata(pdev, data);
200
201	if (pdata->dc_valid == false && pdata->usb_valid == false) {
202		dev_err(dev, "No valid power sources.\n");
203		ret = -EINVAL;
204		goto err;
205	}
206
207	if (pdata->dc_valid) {
208		if (pdata->dok && gpio_is_valid(pdata->dok) &&
209				pdata->dcm && gpio_is_valid(pdata->dcm)) {
210			gpio = pdata->dok; /* PULL_UPed Interrupt */
211			ta_in = gpio_get_value(gpio) ? 0 : 1;
212
213			gpio = pdata->dcm; /* Output */
214			gpio_set_value(gpio, ta_in);
215		} else {
216			dev_err(dev, "When DC is wired, DOK and DCM should"
217					" be wired as well.\n");
218			ret = -EINVAL;
219			goto err;
220		}
221	} else {
222		if (pdata->dcm) {
223			if (gpio_is_valid(pdata->dcm))
224				gpio_set_value(pdata->dcm, 0);
225			else {
226				dev_err(dev, "Invalid pin: dcm.\n");
227				ret = -EINVAL;
228				goto err;
229			}
230		}
231	}
232
233	if (pdata->usb_valid) {
234		if (pdata->uok && gpio_is_valid(pdata->uok)) {
235			gpio = pdata->uok;
236			usb_in = gpio_get_value(gpio) ? 0 : 1;
237		} else {
238			dev_err(dev, "When USB is wired, UOK should be wired."
239					"as well.\n");
240			ret = -EINVAL;
241			goto err;
242		}
243	}
244
245	if (pdata->cen) {
246		if (gpio_is_valid(pdata->cen)) {
247			gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
248		} else {
249			dev_err(dev, "Invalid pin: cen.\n");
250			ret = -EINVAL;
251			goto err;
252		}
253	}
254
255	if (pdata->chg) {
256		if (!gpio_is_valid(pdata->chg)) {
257			dev_err(dev, "Invalid pin: chg.\n");
258			ret = -EINVAL;
259			goto err;
260		}
261	}
262
263	if (pdata->flt) {
264		if (!gpio_is_valid(pdata->flt)) {
265			dev_err(dev, "Invalid pin: flt.\n");
266			ret = -EINVAL;
267			goto err;
268		}
269	}
270
271	if (pdata->usus) {
272		if (!gpio_is_valid(pdata->usus)) {
273			dev_err(dev, "Invalid pin: usus.\n");
274			ret = -EINVAL;
275			goto err;
276		}
277	}
278
279	data->fault = false;
280	data->ta_in = ta_in;
281	data->usb_in = usb_in;
282
283	data->psy.name = "max8903_charger";
284	data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
285			((usb_in) ? POWER_SUPPLY_TYPE_USB :
286			 POWER_SUPPLY_TYPE_BATTERY);
287	data->psy.get_property = max8903_get_property;
288	data->psy.properties = max8903_charger_props;
289	data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
290
291	ret = power_supply_register(dev, &data->psy);
292	if (ret) {
293		dev_err(dev, "failed: power supply register.\n");
294		goto err;
295	}
296
297	if (pdata->dc_valid) {
298		ret = request_threaded_irq(gpio_to_irq(pdata->dok),
299				NULL, max8903_dcin,
300				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
301				"MAX8903 DC IN", data);
302		if (ret) {
303			dev_err(dev, "Cannot request irq %d for DC (%d)\n",
304					gpio_to_irq(pdata->dok), ret);
305			goto err_psy;
306		}
307	}
308
309	if (pdata->usb_valid) {
310		ret = request_threaded_irq(gpio_to_irq(pdata->uok),
311				NULL, max8903_usbin,
312				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
313				"MAX8903 USB IN", data);
314		if (ret) {
315			dev_err(dev, "Cannot request irq %d for USB (%d)\n",
316					gpio_to_irq(pdata->uok), ret);
317			goto err_dc_irq;
318		}
319	}
320
321	if (pdata->flt) {
322		ret = request_threaded_irq(gpio_to_irq(pdata->flt),
323				NULL, max8903_fault,
324				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
325				"MAX8903 Fault", data);
326		if (ret) {
327			dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
328					gpio_to_irq(pdata->flt), ret);
329			goto err_usb_irq;
330		}
331	}
332
333	return 0;
334
335err_usb_irq:
336	if (pdata->usb_valid)
337		free_irq(gpio_to_irq(pdata->uok), data);
338err_dc_irq:
339	if (pdata->dc_valid)
340		free_irq(gpio_to_irq(pdata->dok), data);
341err_psy:
342	power_supply_unregister(&data->psy);
343err:
344	kfree(data);
345	return ret;
346}
347
348static __devexit int max8903_remove(struct platform_device *pdev)
349{
350	struct max8903_data *data = platform_get_drvdata(pdev);
351
352	if (data) {
353		struct max8903_pdata *pdata = &data->pdata;
354
355		if (pdata->flt)
356			free_irq(gpio_to_irq(pdata->flt), data);
357		if (pdata->usb_valid)
358			free_irq(gpio_to_irq(pdata->uok), data);
359		if (pdata->dc_valid)
360			free_irq(gpio_to_irq(pdata->dok), data);
361		power_supply_unregister(&data->psy);
362		kfree(data);
363	}
364
365	return 0;
366}
367
368static struct platform_driver max8903_driver = {
369	.probe	= max8903_probe,
370	.remove	= __devexit_p(max8903_remove),
371	.driver = {
372		.name	= "max8903-charger",
373		.owner	= THIS_MODULE,
374	},
375};
376
377static int __init max8903_init(void)
378{
379	return platform_driver_register(&max8903_driver);
380}
381module_init(max8903_init);
382
383static void __exit max8903_exit(void)
384{
385	platform_driver_unregister(&max8903_driver);
386}
387module_exit(max8903_exit);
388
389MODULE_LICENSE("GPL");
390MODULE_DESCRIPTION("MAX8903 Charger Driver");
391MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
392MODULE_ALIAS("max8903-charger");
393