summaryrefslogtreecommitdiffstats
path: root/drivers/power/generic-adc-battery.c
blob: edb36bf781b0cb0bb0856b72ab91b2aa8e33aaa4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/*
 * Generic battery driver code using IIO
 * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
 * based on jz4740-battery.c
 * based on s3c_adc_battery.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 */
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/iio/consumer.h>
#include <linux/iio/types.h>
#include <linux/power/generic-adc-battery.h>

#define JITTER_DEFAULT 10 /* hope 10ms is enough */

enum gab_chan_type {
	GAB_VOLTAGE = 0,
	GAB_CURRENT,
	GAB_POWER,
	GAB_MAX_CHAN_TYPE
};

/*
 * gab_chan_name suggests the standard channel names for commonly used
 * channel types.
 */
static const char *const gab_chan_name[] = {
	[GAB_VOLTAGE]	= "voltage",
	[GAB_CURRENT]	= "current",
	[GAB_POWER]		= "power",
};

struct gab {
	struct power_supply		*psy;
	struct power_supply_desc	psy_desc;
	struct iio_channel	*channel[GAB_MAX_CHAN_TYPE];
	struct gab_platform_data	*pdata;
	struct delayed_work bat_work;
	int	level;
	int	status;
	bool cable_plugged;
};

static struct gab *to_generic_bat(struct power_supply *psy)
{
	return power_supply_get_drvdata(psy);
}

static void gab_ext_power_changed(struct power_supply *psy)
{
	struct gab *adc_bat = to_generic_bat(psy);

	schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
}

static const enum power_supply_property gab_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_MODEL_NAME,
};

/*
 * This properties are set based on the received platform data and this
 * should correspond one-to-one with enum chan_type.
 */
static const enum power_supply_property gab_dyn_props[] = {
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_POWER_NOW,
};

static bool gab_charge_finished(struct gab *adc_bat)
{
	struct gab_platform_data *pdata = adc_bat->pdata;
	bool ret = gpio_get_value(pdata->gpio_charge_finished);
	bool inv = pdata->gpio_inverted;

	if (!gpio_is_valid(pdata->gpio_charge_finished))
		return false;
	return ret ^ inv;
}

static int gab_get_status(struct gab *adc_bat)
{
	struct gab_platform_data *pdata = adc_bat->pdata;
	struct power_supply_info *bat_info;

	bat_info = &pdata->battery_info;
	if (adc_bat->level == bat_info->charge_full_design)
		return POWER_SUPPLY_STATUS_FULL;
	return adc_bat->status;
}

static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_POWER_NOW:
		return GAB_POWER;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		return GAB_VOLTAGE;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		return GAB_CURRENT;
	default:
		WARN_ON(1);
		break;
	}
	return GAB_POWER;
}

static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
		int *result)
{
	int ret;
	int chan_index;

	chan_index = gab_prop_to_chan(psp);
	ret = iio_read_channel_processed(adc_bat->channel[chan_index],
			result);
	if (ret < 0)
		pr_err("read channel error\n");
	return ret;
}

static int gab_get_property(struct power_supply *psy,
		enum power_supply_property psp, union power_supply_propval *val)
{
	struct gab *adc_bat;
	struct gab_platform_data *pdata;
	struct power_supply_info *bat_info;
	int result = 0;
	int ret = 0;

	adc_bat = to_generic_bat(psy);
	if (!adc_bat) {
		dev_err(&psy->dev, "no battery infos ?!\n");
		return -EINVAL;
	}
	pdata = adc_bat->pdata;
	bat_info = &pdata->battery_info;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = gab_get_status(adc_bat);
		break;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
		val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		val->intval = pdata->cal_charge(result);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	case POWER_SUPPLY_PROP_POWER_NOW:
		ret = read_channel(adc_bat, psp, &result);
		if (ret < 0)
			goto err;
		val->intval = result;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = bat_info->technology;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = bat_info->voltage_min_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = bat_info->voltage_max_design;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		val->intval = bat_info->charge_full_design;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = bat_info->name;
		break;
	default:
		return -EINVAL;
	}
err:
	return ret;
}

static void gab_work(struct work_struct *work)
{
	struct gab *adc_bat;
	struct gab_platform_data *pdata;
	struct delayed_work *delayed_work;
	bool is_plugged;
	int status;

	delayed_work = to_delayed_work(work);
	adc_bat = container_of(delayed_work, struct gab, bat_work);
	pdata = adc_bat->pdata;
	status = adc_bat->status;

	is_plugged = power_supply_am_i_supplied(adc_bat->psy);
	adc_bat->cable_plugged = is_plugged;

	if (!is_plugged)
		adc_bat->status =  POWER_SUPPLY_STATUS_DISCHARGING;
	else if (gab_charge_finished(adc_bat))
		adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	else
		adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;

	if (status != adc_bat->status)
		power_supply_changed(adc_bat->psy);
}

static irqreturn_t gab_charged(int irq, void *dev_id)
{
	struct gab *adc_bat = dev_id;
	struct gab_platform_data *pdata = adc_bat->pdata;
	int delay;

	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
	schedule_delayed_work(&adc_bat->bat_work,
			msecs_to_jiffies(delay));
	return IRQ_HANDLED;
}

static int gab_probe(struct platform_device *pdev)
{
	struct gab *adc_bat;
	struct power_supply_desc *psy_desc;
	struct power_supply_config psy_cfg = {};
	struct gab_platform_data *pdata = pdev->dev.platform_data;
	enum power_supply_property *properties;
	int ret = 0;
	int chan;
	int index = 0;

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

	psy_cfg.drv_data = adc_bat;
	psy_desc = &adc_bat->psy_desc;
	psy_desc->name = pdata->battery_info.name;

	/* bootup default values for the battery */
	adc_bat->cable_plugged = false;
	adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
	psy_desc->get_property = gab_get_property;
	psy_desc->external_power_changed = gab_ext_power_changed;
	adc_bat->pdata = pdata;

	/*
	 * copying the static properties and allocating extra memory for holding
	 * the extra configurable properties received from platform data.
	 */
	psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
					ARRAY_SIZE(gab_chan_name),
					sizeof(*psy_desc->properties),
					GFP_KERNEL);
	if (!psy_desc->properties) {
		ret = -ENOMEM;
		goto first_mem_fail;
	}

	memcpy(psy_desc->properties, gab_props, sizeof(gab_props));
	properties = (enum power_supply_property *)
			((char *)psy_desc->properties + sizeof(gab_props));

	/*
	 * getting channel from iio and copying the battery properties
	 * based on the channel supported by consumer device.
	 */
	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
		adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
							 gab_chan_name[chan]);
		if (IS_ERR(adc_bat->channel[chan])) {
			ret = PTR_ERR(adc_bat->channel[chan]);
			adc_bat->channel[chan] = NULL;
		} else {
			/* copying properties for supported channels only */
			memcpy(properties + sizeof(*(psy_desc->properties)) * index,
					&gab_dyn_props[chan],
					sizeof(gab_dyn_props[chan]));
			index++;
		}
	}

	/* none of the channels are supported so let's bail out */
	if (index == 0) {
		ret = -ENODEV;
		goto second_mem_fail;
	}

	/*
	 * Total number of properties is equal to static properties
	 * plus the dynamic properties.Some properties may not be set
	 * as come channels may be not be supported by the device.So
	 * we need to take care of that.
	 */
	psy_desc->num_properties = ARRAY_SIZE(gab_props) + index;

	adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
	if (IS_ERR(adc_bat->psy)) {
		ret = PTR_ERR(adc_bat->psy);
		goto err_reg_fail;
	}

	INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);

	if (gpio_is_valid(pdata->gpio_charge_finished)) {
		int irq;
		ret = gpio_request(pdata->gpio_charge_finished, "charged");
		if (ret)
			goto gpio_req_fail;

		irq = gpio_to_irq(pdata->gpio_charge_finished);
		ret = request_any_context_irq(irq, gab_charged,
				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				"battery charged", adc_bat);
		if (ret < 0)
			goto err_gpio;
	}

	platform_set_drvdata(pdev, adc_bat);

	/* Schedule timer to check current status */
	schedule_delayed_work(&adc_bat->bat_work,
			msecs_to_jiffies(0));
	return 0;

err_gpio:
	gpio_free(pdata->gpio_charge_finished);
gpio_req_fail:
	power_supply_unregister(adc_bat->psy);
err_reg_fail:
	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
		if (adc_bat->channel[chan])
			iio_channel_release(adc_bat->channel[chan]);
	}
second_mem_fail:
	kfree(psy_desc->properties);
first_mem_fail:
	return ret;
}

static int gab_remove(struct platform_device *pdev)
{
	int chan;
	struct gab *adc_bat = platform_get_drvdata(pdev);
	struct gab_platform_data *pdata = adc_bat->pdata;

	power_supply_unregister(adc_bat->psy);

	if (gpio_is_valid(pdata->gpio_charge_finished)) {
		free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
		gpio_free(pdata->gpio_charge_finished);
	}

	for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
		if (adc_bat->channel[chan])
			iio_channel_release(adc_bat->channel[chan]);
	}

	kfree(adc_bat->psy_desc.properties);
	cancel_delayed_work(&adc_bat->bat_work);
	return 0;
}

#ifdef CONFIG_PM
static int gab_suspend(struct device *dev)
{
	struct gab *adc_bat = dev_get_drvdata(dev);

	cancel_delayed_work_sync(&adc_bat->bat_work);
	adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
	return 0;
}

static int gab_resume(struct device *dev)
{
	struct gab *adc_bat = dev_get_drvdata(dev);
	struct gab_platform_data *pdata = adc_bat->pdata;
	int delay;

	delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;

	/* Schedule timer to check current status */
	schedule_delayed_work(&adc_bat->bat_work,
			msecs_to_jiffies(delay));
	return 0;
}

static const struct dev_pm_ops gab_pm_ops = {
	.suspend        = gab_suspend,
	.resume         = gab_resume,
};

#define GAB_PM_OPS       (&gab_pm_ops)
#else
#define GAB_PM_OPS       (NULL)
#endif

static struct platform_driver gab_driver = {
	.driver		= {
		.name	= "generic-adc-battery",
		.pm	= GAB_PM_OPS
	},
	.probe		= gab_probe,
	.remove		= gab_remove,
};
module_platform_driver(gab_driver);

MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
MODULE_DESCRIPTION("generic battery driver using IIO");
MODULE_LICENSE("GPL");