2 * Generic battery driver code using IIO
3 * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
4 * based on jz4740-battery.c
5 * based on s3c_adc_battery.c
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/power_supply.h>
15 #include <linux/gpio.h>
16 #include <linux/err.h>
17 #include <linux/timer.h>
18 #include <linux/jiffies.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/iio/consumer.h>
24 #include <linux/iio/types.h>
25 #include <linux/power/generic-adc-battery.h>
27 #define JITTER_DEFAULT 10 /* hope 10ms is enough */
37 * gab_chan_name suggests the standard channel names for commonly used
40 static const char *const gab_chan_name[] = {
41 [GAB_VOLTAGE] = "voltage",
42 [GAB_CURRENT] = "current",
43 [GAB_POWER] = "power",
47 struct power_supply *psy;
48 struct power_supply_desc psy_desc;
49 struct iio_channel *channel[GAB_MAX_CHAN_TYPE];
50 struct gab_platform_data *pdata;
51 struct delayed_work bat_work;
57 static struct gab *to_generic_bat(struct power_supply *psy)
59 return power_supply_get_drvdata(psy);
62 static void gab_ext_power_changed(struct power_supply *psy)
64 struct gab *adc_bat = to_generic_bat(psy);
66 schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
69 static const enum power_supply_property gab_props[] = {
70 POWER_SUPPLY_PROP_STATUS,
71 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
72 POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
73 POWER_SUPPLY_PROP_CHARGE_NOW,
74 POWER_SUPPLY_PROP_VOLTAGE_NOW,
75 POWER_SUPPLY_PROP_CURRENT_NOW,
76 POWER_SUPPLY_PROP_TECHNOLOGY,
77 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
78 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
79 POWER_SUPPLY_PROP_MODEL_NAME,
83 * This properties are set based on the received platform data and this
84 * should correspond one-to-one with enum chan_type.
86 static const enum power_supply_property gab_dyn_props[] = {
87 POWER_SUPPLY_PROP_VOLTAGE_NOW,
88 POWER_SUPPLY_PROP_CURRENT_NOW,
89 POWER_SUPPLY_PROP_POWER_NOW,
92 static bool gab_charge_finished(struct gab *adc_bat)
94 struct gab_platform_data *pdata = adc_bat->pdata;
95 bool ret = gpio_get_value(pdata->gpio_charge_finished);
96 bool inv = pdata->gpio_inverted;
98 if (!gpio_is_valid(pdata->gpio_charge_finished))
103 static int gab_get_status(struct gab *adc_bat)
105 struct gab_platform_data *pdata = adc_bat->pdata;
106 struct power_supply_info *bat_info;
108 bat_info = &pdata->battery_info;
109 if (adc_bat->level == bat_info->charge_full_design)
110 return POWER_SUPPLY_STATUS_FULL;
111 return adc_bat->status;
114 static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
117 case POWER_SUPPLY_PROP_POWER_NOW:
119 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
121 case POWER_SUPPLY_PROP_CURRENT_NOW:
130 static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
136 chan_index = gab_prop_to_chan(psp);
137 ret = iio_read_channel_processed(adc_bat->channel[chan_index],
140 pr_err("read channel error\n");
144 static int gab_get_property(struct power_supply *psy,
145 enum power_supply_property psp, union power_supply_propval *val)
148 struct gab_platform_data *pdata;
149 struct power_supply_info *bat_info;
153 adc_bat = to_generic_bat(psy);
155 dev_err(&psy->dev, "no battery infos ?!\n");
158 pdata = adc_bat->pdata;
159 bat_info = &pdata->battery_info;
162 case POWER_SUPPLY_PROP_STATUS:
163 val->intval = gab_get_status(adc_bat);
165 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
168 case POWER_SUPPLY_PROP_CHARGE_NOW:
169 val->intval = pdata->cal_charge(result);
171 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
172 case POWER_SUPPLY_PROP_CURRENT_NOW:
173 case POWER_SUPPLY_PROP_POWER_NOW:
174 ret = read_channel(adc_bat, psp, &result);
177 val->intval = result;
179 case POWER_SUPPLY_PROP_TECHNOLOGY:
180 val->intval = bat_info->technology;
182 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
183 val->intval = bat_info->voltage_min_design;
185 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
186 val->intval = bat_info->voltage_max_design;
188 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
189 val->intval = bat_info->charge_full_design;
191 case POWER_SUPPLY_PROP_MODEL_NAME:
192 val->strval = bat_info->name;
201 static void gab_work(struct work_struct *work)
204 struct gab_platform_data *pdata;
205 struct delayed_work *delayed_work;
209 delayed_work = to_delayed_work(work);
210 adc_bat = container_of(delayed_work, struct gab, bat_work);
211 pdata = adc_bat->pdata;
212 status = adc_bat->status;
214 is_plugged = power_supply_am_i_supplied(adc_bat->psy);
215 adc_bat->cable_plugged = is_plugged;
218 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
219 else if (gab_charge_finished(adc_bat))
220 adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
222 adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
224 if (status != adc_bat->status)
225 power_supply_changed(adc_bat->psy);
228 static irqreturn_t gab_charged(int irq, void *dev_id)
230 struct gab *adc_bat = dev_id;
231 struct gab_platform_data *pdata = adc_bat->pdata;
234 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
235 schedule_delayed_work(&adc_bat->bat_work,
236 msecs_to_jiffies(delay));
240 static int gab_probe(struct platform_device *pdev)
243 struct power_supply_desc *psy_desc;
244 struct power_supply_config psy_cfg = {};
245 struct gab_platform_data *pdata = pdev->dev.platform_data;
248 int index = ARRAY_SIZE(gab_props);
251 adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
253 dev_err(&pdev->dev, "failed to allocate memory\n");
257 psy_cfg.drv_data = adc_bat;
258 psy_desc = &adc_bat->psy_desc;
259 psy_desc->name = pdata->battery_info.name;
261 /* bootup default values for the battery */
262 adc_bat->cable_plugged = false;
263 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
264 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
265 psy_desc->get_property = gab_get_property;
266 psy_desc->external_power_changed = gab_ext_power_changed;
267 adc_bat->pdata = pdata;
270 * copying the static properties and allocating extra memory for holding
271 * the extra configurable properties received from platform data.
273 psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
274 ARRAY_SIZE(gab_chan_name),
275 sizeof(*psy_desc->properties),
277 if (!psy_desc->properties) {
282 memcpy(psy_desc->properties, gab_props, sizeof(gab_props));
285 * getting channel from iio and copying the battery properties
286 * based on the channel supported by consumer device.
288 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
289 adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
290 gab_chan_name[chan]);
291 if (IS_ERR(adc_bat->channel[chan])) {
292 ret = PTR_ERR(adc_bat->channel[chan]);
293 adc_bat->channel[chan] = NULL;
295 /* copying properties for supported channels only */
298 for (index2 = 0; index2 < index; index2++) {
299 if (psy_desc->properties[index2] ==
301 break; /* already known */
303 if (index2 == index) /* really new */
304 psy_desc->properties[index++] =
310 /* none of the channels are supported so let's bail out */
313 goto second_mem_fail;
317 * Total number of properties is equal to static properties
318 * plus the dynamic properties.Some properties may not be set
319 * as come channels may be not be supported by the device.So
320 * we need to take care of that.
322 psy_desc->num_properties = index;
324 adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
325 if (IS_ERR(adc_bat->psy)) {
326 ret = PTR_ERR(adc_bat->psy);
330 INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
332 if (gpio_is_valid(pdata->gpio_charge_finished)) {
334 ret = gpio_request(pdata->gpio_charge_finished, "charged");
338 irq = gpio_to_irq(pdata->gpio_charge_finished);
339 ret = request_any_context_irq(irq, gab_charged,
340 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
341 "battery charged", adc_bat);
346 platform_set_drvdata(pdev, adc_bat);
348 /* Schedule timer to check current status */
349 schedule_delayed_work(&adc_bat->bat_work,
350 msecs_to_jiffies(0));
354 gpio_free(pdata->gpio_charge_finished);
356 power_supply_unregister(adc_bat->psy);
358 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
359 if (adc_bat->channel[chan])
360 iio_channel_release(adc_bat->channel[chan]);
363 kfree(psy_desc->properties);
368 static int gab_remove(struct platform_device *pdev)
371 struct gab *adc_bat = platform_get_drvdata(pdev);
372 struct gab_platform_data *pdata = adc_bat->pdata;
374 power_supply_unregister(adc_bat->psy);
376 if (gpio_is_valid(pdata->gpio_charge_finished)) {
377 free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
378 gpio_free(pdata->gpio_charge_finished);
381 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
382 if (adc_bat->channel[chan])
383 iio_channel_release(adc_bat->channel[chan]);
386 kfree(adc_bat->psy_desc.properties);
387 cancel_delayed_work(&adc_bat->bat_work);
392 static int gab_suspend(struct device *dev)
394 struct gab *adc_bat = dev_get_drvdata(dev);
396 cancel_delayed_work_sync(&adc_bat->bat_work);
397 adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
401 static int gab_resume(struct device *dev)
403 struct gab *adc_bat = dev_get_drvdata(dev);
404 struct gab_platform_data *pdata = adc_bat->pdata;
407 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
409 /* Schedule timer to check current status */
410 schedule_delayed_work(&adc_bat->bat_work,
411 msecs_to_jiffies(delay));
415 static const struct dev_pm_ops gab_pm_ops = {
416 .suspend = gab_suspend,
417 .resume = gab_resume,
420 #define GAB_PM_OPS (&gab_pm_ops)
422 #define GAB_PM_OPS (NULL)
425 static struct platform_driver gab_driver = {
427 .name = "generic-adc-battery",
431 .remove = gab_remove,
433 module_platform_driver(gab_driver);
435 MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
436 MODULE_DESCRIPTION("generic battery driver using IIO");
437 MODULE_LICENSE("GPL");