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Linux/drivers/power/generic-adc-battery.c

  1 /*
  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
  6  *
  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
  9  * more details.
 10  *
 11  */
 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>
 26 
 27 #define JITTER_DEFAULT 10 /* hope 10ms is enough */
 28 
 29 enum gab_chan_type {
 30         GAB_VOLTAGE = 0,
 31         GAB_CURRENT,
 32         GAB_POWER,
 33         GAB_MAX_CHAN_TYPE
 34 };
 35 
 36 /*
 37  * gab_chan_name suggests the standard channel names for commonly used
 38  * channel types.
 39  */
 40 static const char *const gab_chan_name[] = {
 41         [GAB_VOLTAGE]   = "voltage",
 42         [GAB_CURRENT]   = "current",
 43         [GAB_POWER]             = "power",
 44 };
 45 
 46 struct gab {
 47         struct power_supply     psy;
 48         struct iio_channel      *channel[GAB_MAX_CHAN_TYPE];
 49         struct gab_platform_data        *pdata;
 50         struct delayed_work bat_work;
 51         int     level;
 52         int     status;
 53         bool cable_plugged;
 54 };
 55 
 56 static struct gab *to_generic_bat(struct power_supply *psy)
 57 {
 58         return container_of(psy, struct gab, psy);
 59 }
 60 
 61 static void gab_ext_power_changed(struct power_supply *psy)
 62 {
 63         struct gab *adc_bat = to_generic_bat(psy);
 64 
 65         schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
 66 }
 67 
 68 static const enum power_supply_property gab_props[] = {
 69         POWER_SUPPLY_PROP_STATUS,
 70         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 71         POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 72         POWER_SUPPLY_PROP_CHARGE_NOW,
 73         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 74         POWER_SUPPLY_PROP_CURRENT_NOW,
 75         POWER_SUPPLY_PROP_TECHNOLOGY,
 76         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 77         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 78         POWER_SUPPLY_PROP_MODEL_NAME,
 79 };
 80 
 81 /*
 82  * This properties are set based on the received platform data and this
 83  * should correspond one-to-one with enum chan_type.
 84  */
 85 static const enum power_supply_property gab_dyn_props[] = {
 86         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 87         POWER_SUPPLY_PROP_CURRENT_NOW,
 88         POWER_SUPPLY_PROP_POWER_NOW,
 89 };
 90 
 91 static bool gab_charge_finished(struct gab *adc_bat)
 92 {
 93         struct gab_platform_data *pdata = adc_bat->pdata;
 94         bool ret = gpio_get_value(pdata->gpio_charge_finished);
 95         bool inv = pdata->gpio_inverted;
 96 
 97         if (!gpio_is_valid(pdata->gpio_charge_finished))
 98                 return false;
 99         return ret ^ inv;
100 }
101 
102 static int gab_get_status(struct gab *adc_bat)
103 {
104         struct gab_platform_data *pdata = adc_bat->pdata;
105         struct power_supply_info *bat_info;
106 
107         bat_info = &pdata->battery_info;
108         if (adc_bat->level == bat_info->charge_full_design)
109                 return POWER_SUPPLY_STATUS_FULL;
110         return adc_bat->status;
111 }
112 
113 static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
114 {
115         switch (psp) {
116         case POWER_SUPPLY_PROP_POWER_NOW:
117                 return GAB_POWER;
118         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
119                 return GAB_VOLTAGE;
120         case POWER_SUPPLY_PROP_CURRENT_NOW:
121                 return GAB_CURRENT;
122         default:
123                 WARN_ON(1);
124                 break;
125         }
126         return GAB_POWER;
127 }
128 
129 static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
130                 int *result)
131 {
132         int ret;
133         int chan_index;
134 
135         chan_index = gab_prop_to_chan(psp);
136         ret = iio_read_channel_processed(adc_bat->channel[chan_index],
137                         result);
138         if (ret < 0)
139                 pr_err("read channel error\n");
140         return ret;
141 }
142 
143 static int gab_get_property(struct power_supply *psy,
144                 enum power_supply_property psp, union power_supply_propval *val)
145 {
146         struct gab *adc_bat;
147         struct gab_platform_data *pdata;
148         struct power_supply_info *bat_info;
149         int result = 0;
150         int ret = 0;
151 
152         adc_bat = to_generic_bat(psy);
153         if (!adc_bat) {
154                 dev_err(psy->dev, "no battery infos ?!\n");
155                 return -EINVAL;
156         }
157         pdata = adc_bat->pdata;
158         bat_info = &pdata->battery_info;
159 
160         switch (psp) {
161         case POWER_SUPPLY_PROP_STATUS:
162                 gab_get_status(adc_bat);
163                 break;
164         case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
165                 val->intval = 0;
166                 break;
167         case POWER_SUPPLY_PROP_CHARGE_NOW:
168                 val->intval = pdata->cal_charge(result);
169                 break;
170         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
171         case POWER_SUPPLY_PROP_CURRENT_NOW:
172         case POWER_SUPPLY_PROP_POWER_NOW:
173                 ret = read_channel(adc_bat, psp, &result);
174                 if (ret < 0)
175                         goto err;
176                 val->intval = result;
177                 break;
178         case POWER_SUPPLY_PROP_TECHNOLOGY:
179                 val->intval = bat_info->technology;
180                 break;
181         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
182                 val->intval = bat_info->voltage_min_design;
183                 break;
184         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
185                 val->intval = bat_info->voltage_max_design;
186                 break;
187         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
188                 val->intval = bat_info->charge_full_design;
189                 break;
190         case POWER_SUPPLY_PROP_MODEL_NAME:
191                 val->strval = bat_info->name;
192                 break;
193         default:
194                 return -EINVAL;
195         }
196 err:
197         return ret;
198 }
199 
200 static void gab_work(struct work_struct *work)
201 {
202         struct gab *adc_bat;
203         struct gab_platform_data *pdata;
204         struct delayed_work *delayed_work;
205         bool is_plugged;
206         int status;
207 
208         delayed_work = container_of(work, struct delayed_work, work);
209         adc_bat = container_of(delayed_work, struct gab, bat_work);
210         pdata = adc_bat->pdata;
211         status = adc_bat->status;
212 
213         is_plugged = power_supply_am_i_supplied(&adc_bat->psy);
214         adc_bat->cable_plugged = is_plugged;
215 
216         if (!is_plugged)
217                 adc_bat->status =  POWER_SUPPLY_STATUS_DISCHARGING;
218         else if (gab_charge_finished(adc_bat))
219                 adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
220         else
221                 adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
222 
223         if (status != adc_bat->status)
224                 power_supply_changed(&adc_bat->psy);
225 }
226 
227 static irqreturn_t gab_charged(int irq, void *dev_id)
228 {
229         struct gab *adc_bat = dev_id;
230         struct gab_platform_data *pdata = adc_bat->pdata;
231         int delay;
232 
233         delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
234         schedule_delayed_work(&adc_bat->bat_work,
235                         msecs_to_jiffies(delay));
236         return IRQ_HANDLED;
237 }
238 
239 static int gab_probe(struct platform_device *pdev)
240 {
241         struct gab *adc_bat;
242         struct power_supply *psy;
243         struct gab_platform_data *pdata = pdev->dev.platform_data;
244         enum power_supply_property *properties;
245         int ret = 0;
246         int chan;
247         int index = 0;
248 
249         adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
250         if (!adc_bat) {
251                 dev_err(&pdev->dev, "failed to allocate memory\n");
252                 return -ENOMEM;
253         }
254 
255         psy = &adc_bat->psy;
256         psy->name = pdata->battery_info.name;
257 
258         /* bootup default values for the battery */
259         adc_bat->cable_plugged = false;
260         adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
261         psy->type = POWER_SUPPLY_TYPE_BATTERY;
262         psy->get_property = gab_get_property;
263         psy->external_power_changed = gab_ext_power_changed;
264         adc_bat->pdata = pdata;
265 
266         /*
267          * copying the static properties and allocating extra memory for holding
268          * the extra configurable properties received from platform data.
269          */
270         psy->properties = kcalloc(ARRAY_SIZE(gab_props) +
271                                         ARRAY_SIZE(gab_chan_name),
272                                         sizeof(*psy->properties), GFP_KERNEL);
273         if (!psy->properties) {
274                 ret = -ENOMEM;
275                 goto first_mem_fail;
276         }
277 
278         memcpy(psy->properties, gab_props, sizeof(gab_props));
279         properties = (enum power_supply_property *)
280                                 ((char *)psy->properties + sizeof(gab_props));
281 
282         /*
283          * getting channel from iio and copying the battery properties
284          * based on the channel supported by consumer device.
285          */
286         for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
287                 adc_bat->channel[chan] = iio_channel_get(&pdev->dev,
288                                                          gab_chan_name[chan]);
289                 if (IS_ERR(adc_bat->channel[chan])) {
290                         ret = PTR_ERR(adc_bat->channel[chan]);
291                         adc_bat->channel[chan] = NULL;
292                 } else {
293                         /* copying properties for supported channels only */
294                         memcpy(properties + sizeof(*(psy->properties)) * index,
295                                         &gab_dyn_props[chan],
296                                         sizeof(gab_dyn_props[chan]));
297                         index++;
298                 }
299         }
300 
301         /* none of the channels are supported so let's bail out */
302         if (index == 0) {
303                 ret = -ENODEV;
304                 goto second_mem_fail;
305         }
306 
307         /*
308          * Total number of properties is equal to static properties
309          * plus the dynamic properties.Some properties may not be set
310          * as come channels may be not be supported by the device.So
311          * we need to take care of that.
312          */
313         psy->num_properties = ARRAY_SIZE(gab_props) + index;
314 
315         ret = power_supply_register(&pdev->dev, psy);
316         if (ret)
317                 goto err_reg_fail;
318 
319         INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
320 
321         if (gpio_is_valid(pdata->gpio_charge_finished)) {
322                 int irq;
323                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
324                 if (ret)
325                         goto gpio_req_fail;
326 
327                 irq = gpio_to_irq(pdata->gpio_charge_finished);
328                 ret = request_any_context_irq(irq, gab_charged,
329                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
330                                 "battery charged", adc_bat);
331                 if (ret < 0)
332                         goto err_gpio;
333         }
334 
335         platform_set_drvdata(pdev, adc_bat);
336 
337         /* Schedule timer to check current status */
338         schedule_delayed_work(&adc_bat->bat_work,
339                         msecs_to_jiffies(0));
340         return 0;
341 
342 err_gpio:
343         gpio_free(pdata->gpio_charge_finished);
344 gpio_req_fail:
345         power_supply_unregister(psy);
346 err_reg_fail:
347         for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
348                 if (adc_bat->channel[chan])
349                         iio_channel_release(adc_bat->channel[chan]);
350         }
351 second_mem_fail:
352         kfree(psy->properties);
353 first_mem_fail:
354         return ret;
355 }
356 
357 static int gab_remove(struct platform_device *pdev)
358 {
359         int chan;
360         struct gab *adc_bat = platform_get_drvdata(pdev);
361         struct gab_platform_data *pdata = adc_bat->pdata;
362 
363         power_supply_unregister(&adc_bat->psy);
364 
365         if (gpio_is_valid(pdata->gpio_charge_finished)) {
366                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
367                 gpio_free(pdata->gpio_charge_finished);
368         }
369 
370         for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
371                 if (adc_bat->channel[chan])
372                         iio_channel_release(adc_bat->channel[chan]);
373         }
374 
375         kfree(adc_bat->psy.properties);
376         cancel_delayed_work(&adc_bat->bat_work);
377         return 0;
378 }
379 
380 #ifdef CONFIG_PM
381 static int gab_suspend(struct device *dev)
382 {
383         struct gab *adc_bat = dev_get_drvdata(dev);
384 
385         cancel_delayed_work_sync(&adc_bat->bat_work);
386         adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
387         return 0;
388 }
389 
390 static int gab_resume(struct device *dev)
391 {
392         struct gab *adc_bat = dev_get_drvdata(dev);
393         struct gab_platform_data *pdata = adc_bat->pdata;
394         int delay;
395 
396         delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
397 
398         /* Schedule timer to check current status */
399         schedule_delayed_work(&adc_bat->bat_work,
400                         msecs_to_jiffies(delay));
401         return 0;
402 }
403 
404 static const struct dev_pm_ops gab_pm_ops = {
405         .suspend        = gab_suspend,
406         .resume         = gab_resume,
407 };
408 
409 #define GAB_PM_OPS       (&gab_pm_ops)
410 #else
411 #define GAB_PM_OPS       (NULL)
412 #endif
413 
414 static struct platform_driver gab_driver = {
415         .driver         = {
416                 .name   = "generic-adc-battery",
417                 .owner  = THIS_MODULE,
418                 .pm     = GAB_PM_OPS
419         },
420         .probe          = gab_probe,
421         .remove         = gab_remove,
422 };
423 module_platform_driver(gab_driver);
424 
425 MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
426 MODULE_DESCRIPTION("generic battery driver using IIO");
427 MODULE_LICENSE("GPL");
428 

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