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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
29enum 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 */
40static const char *const gab_chan_name[] = {
41 [GAB_VOLTAGE] = "voltage",
42 [GAB_CURRENT] = "current",
43 [GAB_POWER] = "power",
44};
45
46struct 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
56static struct gab *to_generic_bat(struct power_supply *psy)
57{
58 return container_of(psy, struct gab, psy);
59}
60
61static 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
68static 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 */
85static 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
91static 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
102static 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
113static 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
129static 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
143static 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 }
196err:
197 return ret;
198}
199
200static 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
227static 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
239static 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
342err_gpio:
343 gpio_free(pdata->gpio_charge_finished);
344gpio_req_fail:
345 power_supply_unregister(psy);
346err_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 }
351second_mem_fail:
352 kfree(psy->properties);
353first_mem_fail:
354 return ret;
355}
356
357static 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
381static 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
390static 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
404static 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
414static 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};
423module_platform_driver(gab_driver);
424
425MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
426MODULE_DESCRIPTION("generic battery driver using IIO");
427MODULE_LICENSE("GPL");