1
2
3
4
5
6
7
8
9
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
28
29enum gab_chan_type {
30 GAB_VOLTAGE = 0,
31 GAB_CURRENT,
32 GAB_POWER,
33 GAB_MAX_CHAN_TYPE
34};
35
36
37
38
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 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;
52 int level;
53 int status;
54 bool cable_plugged;
55};
56
57static struct gab *to_generic_bat(struct power_supply *psy)
58{
59 return power_supply_get_drvdata(psy);
60}
61
62static void gab_ext_power_changed(struct power_supply *psy)
63{
64 struct gab *adc_bat = to_generic_bat(psy);
65
66 schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
67}
68
69static 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,
80};
81
82
83
84
85
86static 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,
90};
91
92static bool gab_charge_finished(struct gab *adc_bat)
93{
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;
97
98 if (!gpio_is_valid(pdata->gpio_charge_finished))
99 return false;
100 return ret ^ inv;
101}
102
103static int gab_get_status(struct gab *adc_bat)
104{
105 struct gab_platform_data *pdata = adc_bat->pdata;
106 struct power_supply_info *bat_info;
107
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;
112}
113
114static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
115{
116 switch (psp) {
117 case POWER_SUPPLY_PROP_POWER_NOW:
118 return GAB_POWER;
119 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
120 return GAB_VOLTAGE;
121 case POWER_SUPPLY_PROP_CURRENT_NOW:
122 return GAB_CURRENT;
123 default:
124 WARN_ON(1);
125 break;
126 }
127 return GAB_POWER;
128}
129
130static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
131 int *result)
132{
133 int ret;
134 int chan_index;
135
136 chan_index = gab_prop_to_chan(psp);
137 ret = iio_read_channel_processed(adc_bat->channel[chan_index],
138 result);
139 if (ret < 0)
140 pr_err("read channel error\n");
141 return ret;
142}
143
144static int gab_get_property(struct power_supply *psy,
145 enum power_supply_property psp, union power_supply_propval *val)
146{
147 struct gab *adc_bat;
148 struct gab_platform_data *pdata;
149 struct power_supply_info *bat_info;
150 int result = 0;
151 int ret = 0;
152
153 adc_bat = to_generic_bat(psy);
154 if (!adc_bat) {
155 dev_err(&psy->dev, "no battery infos ?!\n");
156 return -EINVAL;
157 }
158 pdata = adc_bat->pdata;
159 bat_info = &pdata->battery_info;
160
161 switch (psp) {
162 case POWER_SUPPLY_PROP_STATUS:
163 val->intval = gab_get_status(adc_bat);
164 break;
165 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
166 val->intval = 0;
167 break;
168 case POWER_SUPPLY_PROP_CHARGE_NOW:
169 val->intval = pdata->cal_charge(result);
170 break;
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);
175 if (ret < 0)
176 goto err;
177 val->intval = result;
178 break;
179 case POWER_SUPPLY_PROP_TECHNOLOGY:
180 val->intval = bat_info->technology;
181 break;
182 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
183 val->intval = bat_info->voltage_min_design;
184 break;
185 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
186 val->intval = bat_info->voltage_max_design;
187 break;
188 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
189 val->intval = bat_info->charge_full_design;
190 break;
191 case POWER_SUPPLY_PROP_MODEL_NAME:
192 val->strval = bat_info->name;
193 break;
194 default:
195 return -EINVAL;
196 }
197err:
198 return ret;
199}
200
201static void gab_work(struct work_struct *work)
202{
203 struct gab *adc_bat;
204 struct delayed_work *delayed_work;
205 bool is_plugged;
206 int status;
207
208 delayed_work = to_delayed_work(work);
209 adc_bat = container_of(delayed_work, struct gab, bat_work);
210 status = adc_bat->status;
211
212 is_plugged = power_supply_am_i_supplied(adc_bat->psy);
213 adc_bat->cable_plugged = is_plugged;
214
215 if (!is_plugged)
216 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
217 else if (gab_charge_finished(adc_bat))
218 adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
219 else
220 adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
221
222 if (status != adc_bat->status)
223 power_supply_changed(adc_bat->psy);
224}
225
226static irqreturn_t gab_charged(int irq, void *dev_id)
227{
228 struct gab *adc_bat = dev_id;
229 struct gab_platform_data *pdata = adc_bat->pdata;
230 int delay;
231
232 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
233 schedule_delayed_work(&adc_bat->bat_work,
234 msecs_to_jiffies(delay));
235 return IRQ_HANDLED;
236}
237
238static int gab_probe(struct platform_device *pdev)
239{
240 struct gab *adc_bat;
241 struct power_supply_desc *psy_desc;
242 struct power_supply_config psy_cfg = {};
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_cfg.drv_data = adc_bat;
256 psy_desc = &adc_bat->psy_desc;
257 psy_desc->name = pdata->battery_info.name;
258
259
260 adc_bat->cable_plugged = false;
261 adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
262 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
263 psy_desc->get_property = gab_get_property;
264 psy_desc->external_power_changed = gab_ext_power_changed;
265 adc_bat->pdata = pdata;
266
267
268
269
270
271 psy_desc->properties = kcalloc(ARRAY_SIZE(gab_props) +
272 ARRAY_SIZE(gab_chan_name),
273 sizeof(*psy_desc->properties),
274 GFP_KERNEL);
275 if (!psy_desc->properties) {
276 ret = -ENOMEM;
277 goto first_mem_fail;
278 }
279
280 memcpy(psy_desc->properties, gab_props, sizeof(gab_props));
281 properties = (enum power_supply_property *)
282 ((char *)psy_desc->properties + sizeof(gab_props));
283
284
285
286
287
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;
294 } else {
295
296 memcpy(properties + sizeof(*(psy_desc->properties)) * index,
297 &gab_dyn_props[chan],
298 sizeof(gab_dyn_props[chan]));
299 index++;
300 }
301 }
302
303
304 if (index == 0) {
305 ret = -ENODEV;
306 goto second_mem_fail;
307 }
308
309
310
311
312
313
314
315 psy_desc->num_properties = ARRAY_SIZE(gab_props) + index;
316
317 adc_bat->psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
318 if (IS_ERR(adc_bat->psy)) {
319 ret = PTR_ERR(adc_bat->psy);
320 goto err_reg_fail;
321 }
322
323 INIT_DELAYED_WORK(&adc_bat->bat_work, gab_work);
324
325 if (gpio_is_valid(pdata->gpio_charge_finished)) {
326 int irq;
327 ret = gpio_request(pdata->gpio_charge_finished, "charged");
328 if (ret)
329 goto gpio_req_fail;
330
331 irq = gpio_to_irq(pdata->gpio_charge_finished);
332 ret = request_any_context_irq(irq, gab_charged,
333 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
334 "battery charged", adc_bat);
335 if (ret < 0)
336 goto err_gpio;
337 }
338
339 platform_set_drvdata(pdev, adc_bat);
340
341
342 schedule_delayed_work(&adc_bat->bat_work,
343 msecs_to_jiffies(0));
344 return 0;
345
346err_gpio:
347 gpio_free(pdata->gpio_charge_finished);
348gpio_req_fail:
349 power_supply_unregister(adc_bat->psy);
350err_reg_fail:
351 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
352 if (adc_bat->channel[chan])
353 iio_channel_release(adc_bat->channel[chan]);
354 }
355second_mem_fail:
356 kfree(psy_desc->properties);
357first_mem_fail:
358 return ret;
359}
360
361static int gab_remove(struct platform_device *pdev)
362{
363 int chan;
364 struct gab *adc_bat = platform_get_drvdata(pdev);
365 struct gab_platform_data *pdata = adc_bat->pdata;
366
367 power_supply_unregister(adc_bat->psy);
368
369 if (gpio_is_valid(pdata->gpio_charge_finished)) {
370 free_irq(gpio_to_irq(pdata->gpio_charge_finished), adc_bat);
371 gpio_free(pdata->gpio_charge_finished);
372 }
373
374 for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
375 if (adc_bat->channel[chan])
376 iio_channel_release(adc_bat->channel[chan]);
377 }
378
379 kfree(adc_bat->psy_desc.properties);
380 cancel_delayed_work(&adc_bat->bat_work);
381 return 0;
382}
383
384static int __maybe_unused gab_suspend(struct device *dev)
385{
386 struct gab *adc_bat = dev_get_drvdata(dev);
387
388 cancel_delayed_work_sync(&adc_bat->bat_work);
389 adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
390 return 0;
391}
392
393static int __maybe_unused gab_resume(struct device *dev)
394{
395 struct gab *adc_bat = dev_get_drvdata(dev);
396 struct gab_platform_data *pdata = adc_bat->pdata;
397 int delay;
398
399 delay = pdata->jitter_delay ? pdata->jitter_delay : JITTER_DEFAULT;
400
401
402 schedule_delayed_work(&adc_bat->bat_work,
403 msecs_to_jiffies(delay));
404 return 0;
405}
406
407static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);
408
409static struct platform_driver gab_driver = {
410 .driver = {
411 .name = "generic-adc-battery",
412 .pm = &gab_pm_ops,
413 },
414 .probe = gab_probe,
415 .remove = gab_remove,
416};
417module_platform_driver(gab_driver);
418
419MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
420MODULE_DESCRIPTION("generic battery driver using IIO");
421MODULE_LICENSE("GPL");
422
