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");
147 static int gab_get_property(struct power_supply *psy,
148 enum power_supply_property psp, union power_supply_propval *val)
151 struct gab_platform_data *pdata;
152 struct power_supply_info *bat_info;
156 adc_bat = to_generic_bat(psy);
158 dev_err(&psy->dev, "no battery infos ?!\n");
161 pdata = adc_bat->pdata;
162 bat_info = &pdata->battery_info;
165 case POWER_SUPPLY_PROP_STATUS:
166 val->intval = gab_get_status(adc_bat);
168 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
171 case POWER_SUPPLY_PROP_CHARGE_NOW:
172 val->intval = pdata->cal_charge(result);
174 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
175 case POWER_SUPPLY_PROP_CURRENT_NOW:
176 case POWER_SUPPLY_PROP_POWER_NOW:
177 ret = read_channel(adc_bat, psp, &result);
180 val->intval = result;
182 case POWER_SUPPLY_PROP_TECHNOLOGY:
183 val->intval = bat_info->technology;
185 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
186 val->intval = bat_info->voltage_min_design;
188 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
189 val->intval = bat_info->voltage_max_design;
191 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
192 val->intval = bat_info->charge_full_design;
194 case POWER_SUPPLY_PROP_MODEL_NAME:
195 val->strval = bat_info->name;
204 static void gab_work(struct work_struct *work)
207 struct gab_platform_data *pdata;
208 struct delayed_work *delayed_work;
212 delayed_work = to_delayed_work(work);
213 adc_bat = container_of(delayed_work, struct gab, bat_work);
214 pdata = adc_bat->pdata;
215 status = adc_bat->status;
217 is_plugged = power_supply_am_i_supplied(adc_bat->psy);
218 adc_bat->cable_plugged = is_plugged;
221 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
222 else if (gab_charge_finished(adc_bat))
223 adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
225 adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
227 if (status != adc_bat->status)
228 power_supply_changed(adc_bat->psy);
231 static irqreturn_t gab_charged(int irq, void *dev_id)
233 struct gab *adc_bat = dev_id;
234 struct gab_platform_data *pdata = adc_bat->pdata;
237 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
238 schedule_delayed_work(&adc_bat->bat_work,
239 msecs_to_jiffies(delay));
243 static int gab_probe(struct platform_device *pdev)
246 struct power_supply_desc *psy_desc;
247 struct power_supply_config psy_cfg = {};
248 struct gab_platform_data *pdata = pdev->dev.platform_data;
251 int index = ARRAY_SIZE(gab_props);
254 adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
256 dev_err(&pdev->dev, "failed to allocate memory\n");
260 psy_cfg.drv_data = adc_bat;
261 psy_desc = &adc_bat->psy_desc;
262 psy_desc->name = pdata->battery_info.name;
264 /* bootup default values for the battery */
265 adc_bat->cable_plugged = false;
266 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
267 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
268 psy_desc->get_property = gab_get_property;
269 psy_desc->external_power_changed = gab_ext_power_changed;
270 adc_bat->pdata = pdata;
273 * copying the static properties and allocating extra memory for holding
274 * the extra configurable properties received from platform data.
276 psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
277 ARRAY_SIZE(gab_chan_name),
278 sizeof(*psy_desc->properties),
280 if (!psy_desc->properties) {
285 memcpy(psy_desc->properties, gab_props, sizeof(gab_props));
288 * getting channel from iio and copying the battery properties
289 * based on the channel supported by consumer device.
291 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
292 adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
293 gab_chan_name[chan]);
294 if (IS_ERR(adc_bat->channel[chan])) {
295 ret = PTR_ERR(adc_bat->channel[chan]);
296 adc_bat->channel[chan] = NULL;
298 /* copying properties for supported channels only */
301 for (index2 = 0; index2 < index; index2++) {
302 if (psy_desc->properties[index2] ==
304 break; /* already known */
306 if (index2 == index) /* really new */
307 psy_desc->properties[index++] =
313 /* none of the channels are supported so let's bail out */
316 goto second_mem_fail;
320 * Total number of properties is equal to static properties
321 * plus the dynamic properties.Some properties may not be set
322 * as come channels may be not be supported by the device.So
323 * we need to take care of that.
325 psy_desc->num_properties = index;
327 adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
328 if (IS_ERR(adc_bat->psy)) {
329 ret = PTR_ERR(adc_bat->psy);
333 INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
335 if (gpio_is_valid(pdata->gpio_charge_finished)) {
337 ret = gpio_request(pdata->gpio_charge_finished, "charged");
341 irq = gpio_to_irq(pdata->gpio_charge_finished);
342 ret = request_any_context_irq(irq, gab_charged,
343 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
344 "battery charged", adc_bat);
349 platform_set_drvdata(pdev, adc_bat);
351 /* Schedule timer to check current status */
352 schedule_delayed_work(&adc_bat->bat_work,
353 msecs_to_jiffies(0));
357 gpio_free(pdata->gpio_charge_finished);
359 power_supply_unregister(adc_bat->psy);
361 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
362 if (adc_bat->channel[chan])
363 iio_channel_release(adc_bat->channel[chan]);
366 kfree(psy_desc->properties);
371 static int gab_remove(struct platform_device *pdev)
374 struct gab *adc_bat = platform_get_drvdata(pdev);
375 struct gab_platform_data *pdata = adc_bat->pdata;
377 power_supply_unregister(adc_bat->psy);
379 if (gpio_is_valid(pdata->gpio_charge_finished)) {
380 free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
381 gpio_free(pdata->gpio_charge_finished);
384 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
385 if (adc_bat->channel[chan])
386 iio_channel_release(adc_bat->channel[chan]);
389 kfree(adc_bat->psy_desc.properties);
390 cancel_delayed_work_sync(&adc_bat->bat_work);
394 static int __maybe_unused gab_suspend(struct device *dev)
396 struct gab *adc_bat = dev_get_drvdata(dev);
398 cancel_delayed_work_sync(&adc_bat->bat_work);
399 adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
403 static int __maybe_unused gab_resume(struct device *dev)
405 struct gab *adc_bat = dev_get_drvdata(dev);
406 struct gab_platform_data *pdata = adc_bat->pdata;
409 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
411 /* Schedule timer to check current status */
412 schedule_delayed_work(&adc_bat->bat_work,
413 msecs_to_jiffies(delay));
417 static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);
419 static struct platform_driver gab_driver = {
421 .name = "generic-adc-battery",
425 .remove = gab_remove,
427 module_platform_driver(gab_driver);
429 MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
430 MODULE_DESCRIPTION("generic battery driver using IIO");
431 MODULE_LICENSE("GPL");