Commit | Line | Data |
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808be4b2 | 1 | /* |
b595076a | 2 | * iPAQ h1930/h1940/rx1950 battery controller driver |
808be4b2 VK |
3 | * Copyright (c) Vasily Khoruzhick |
4 | * Based on h1940_battery.c by Arnaud Patard | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file COPYING in the main directory of this archive for | |
8 | * more details. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/interrupt.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/power_supply.h> | |
15 | #include <linux/leds.h> | |
16 | #include <linux/gpio.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/jiffies.h> | |
20 | #include <linux/s3c_adc_battery.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/init.h> | |
815efa1e | 23 | #include <linux/module.h> |
808be4b2 VK |
24 | |
25 | #include <plat/adc.h> | |
26 | ||
27 | #define BAT_POLL_INTERVAL 10000 /* ms */ | |
28 | #define JITTER_DELAY 500 /* ms */ | |
29 | ||
30 | struct s3c_adc_bat { | |
31 | struct power_supply psy; | |
32 | struct s3c_adc_client *client; | |
33 | struct s3c_adc_bat_pdata *pdata; | |
34 | int volt_value; | |
35 | int cur_value; | |
36 | unsigned int timestamp; | |
37 | int level; | |
38 | int status; | |
39 | int cable_plugged:1; | |
40 | }; | |
41 | ||
42 | static struct delayed_work bat_work; | |
43 | ||
44 | static void s3c_adc_bat_ext_power_changed(struct power_supply *psy) | |
45 | { | |
46 | schedule_delayed_work(&bat_work, | |
47 | msecs_to_jiffies(JITTER_DELAY)); | |
48 | } | |
49 | ||
34aed73d HS |
50 | static int gather_samples(struct s3c_adc_client *client, int num, int channel) |
51 | { | |
52 | int value, i; | |
53 | ||
54 | /* default to 1 if nothing is set */ | |
55 | if (num < 1) | |
56 | num = 1; | |
57 | ||
58 | value = 0; | |
59 | for (i = 0; i < num; i++) | |
60 | value += s3c_adc_read(client, channel); | |
61 | value /= num; | |
62 | ||
63 | return value; | |
64 | } | |
65 | ||
808be4b2 VK |
66 | static enum power_supply_property s3c_adc_backup_bat_props[] = { |
67 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
68 | POWER_SUPPLY_PROP_VOLTAGE_MIN, | |
69 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, | |
70 | }; | |
71 | ||
72 | static int s3c_adc_backup_bat_get_property(struct power_supply *psy, | |
73 | enum power_supply_property psp, | |
74 | union power_supply_propval *val) | |
75 | { | |
76 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); | |
77 | ||
78 | if (!bat) { | |
79 | dev_err(psy->dev, "%s: no battery infos ?!\n", __func__); | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | if (bat->volt_value < 0 || | |
84 | jiffies_to_msecs(jiffies - bat->timestamp) > | |
85 | BAT_POLL_INTERVAL) { | |
34aed73d HS |
86 | bat->volt_value = gather_samples(bat->client, |
87 | bat->pdata->backup_volt_samples, | |
808be4b2 VK |
88 | bat->pdata->backup_volt_channel); |
89 | bat->volt_value *= bat->pdata->backup_volt_mult; | |
90 | bat->timestamp = jiffies; | |
91 | } | |
92 | ||
93 | switch (psp) { | |
94 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
95 | val->intval = bat->volt_value; | |
96 | return 0; | |
97 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
98 | val->intval = bat->pdata->backup_volt_min; | |
99 | return 0; | |
100 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
101 | val->intval = bat->pdata->backup_volt_max; | |
102 | return 0; | |
103 | default: | |
104 | return -EINVAL; | |
105 | } | |
106 | } | |
107 | ||
108 | static struct s3c_adc_bat backup_bat = { | |
109 | .psy = { | |
110 | .name = "backup-battery", | |
111 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
112 | .properties = s3c_adc_backup_bat_props, | |
113 | .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props), | |
114 | .get_property = s3c_adc_backup_bat_get_property, | |
115 | .use_for_apm = 1, | |
116 | }, | |
117 | }; | |
118 | ||
119 | static enum power_supply_property s3c_adc_main_bat_props[] = { | |
120 | POWER_SUPPLY_PROP_STATUS, | |
121 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
122 | POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, | |
123 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
124 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
125 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
126 | }; | |
127 | ||
128 | static int calc_full_volt(int volt_val, int cur_val, int impedance) | |
129 | { | |
130 | return volt_val + cur_val * impedance / 1000; | |
131 | } | |
132 | ||
c66ae9bb VK |
133 | static int charge_finished(struct s3c_adc_bat *bat) |
134 | { | |
135 | return bat->pdata->gpio_inverted ? | |
136 | !gpio_get_value(bat->pdata->gpio_charge_finished) : | |
137 | gpio_get_value(bat->pdata->gpio_charge_finished); | |
138 | } | |
139 | ||
808be4b2 VK |
140 | static int s3c_adc_bat_get_property(struct power_supply *psy, |
141 | enum power_supply_property psp, | |
142 | union power_supply_propval *val) | |
143 | { | |
144 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); | |
145 | ||
146 | int new_level; | |
147 | int full_volt; | |
148 | const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac; | |
149 | unsigned int lut_size = bat->pdata->lut_noac_cnt; | |
150 | ||
151 | if (!bat) { | |
152 | dev_err(psy->dev, "no battery infos ?!\n"); | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | if (bat->volt_value < 0 || bat->cur_value < 0 || | |
157 | jiffies_to_msecs(jiffies - bat->timestamp) > | |
158 | BAT_POLL_INTERVAL) { | |
34aed73d HS |
159 | bat->volt_value = gather_samples(bat->client, |
160 | bat->pdata->volt_samples, | |
808be4b2 | 161 | bat->pdata->volt_channel) * bat->pdata->volt_mult; |
34aed73d HS |
162 | bat->cur_value = gather_samples(bat->client, |
163 | bat->pdata->current_samples, | |
808be4b2 VK |
164 | bat->pdata->current_channel) * bat->pdata->current_mult; |
165 | bat->timestamp = jiffies; | |
166 | } | |
167 | ||
168 | if (bat->cable_plugged && | |
169 | ((bat->pdata->gpio_charge_finished < 0) || | |
c66ae9bb | 170 | !charge_finished(bat))) { |
808be4b2 VK |
171 | lut = bat->pdata->lut_acin; |
172 | lut_size = bat->pdata->lut_acin_cnt; | |
173 | } | |
174 | ||
175 | new_level = 100000; | |
176 | full_volt = calc_full_volt((bat->volt_value / 1000), | |
177 | (bat->cur_value / 1000), bat->pdata->internal_impedance); | |
178 | ||
179 | if (full_volt < calc_full_volt(lut->volt, lut->cur, | |
180 | bat->pdata->internal_impedance)) { | |
181 | lut_size--; | |
182 | while (lut_size--) { | |
183 | int lut_volt1; | |
184 | int lut_volt2; | |
185 | ||
186 | lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur, | |
187 | bat->pdata->internal_impedance); | |
188 | lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur, | |
189 | bat->pdata->internal_impedance); | |
190 | if (full_volt < lut_volt1 && full_volt >= lut_volt2) { | |
191 | new_level = (lut[1].level + | |
192 | (lut[0].level - lut[1].level) * | |
193 | (full_volt - lut_volt2) / | |
194 | (lut_volt1 - lut_volt2)) * 1000; | |
195 | break; | |
196 | } | |
197 | new_level = lut[1].level * 1000; | |
198 | lut++; | |
199 | } | |
200 | } | |
201 | ||
202 | bat->level = new_level; | |
203 | ||
204 | switch (psp) { | |
205 | case POWER_SUPPLY_PROP_STATUS: | |
206 | if (bat->pdata->gpio_charge_finished < 0) | |
207 | val->intval = bat->level == 100000 ? | |
208 | POWER_SUPPLY_STATUS_FULL : bat->status; | |
209 | else | |
210 | val->intval = bat->status; | |
211 | return 0; | |
212 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
213 | val->intval = 100000; | |
214 | return 0; | |
215 | case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: | |
216 | val->intval = 0; | |
217 | return 0; | |
218 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
219 | val->intval = bat->level; | |
220 | return 0; | |
221 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
222 | val->intval = bat->volt_value; | |
223 | return 0; | |
224 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
225 | val->intval = bat->cur_value; | |
226 | return 0; | |
227 | default: | |
228 | return -EINVAL; | |
229 | } | |
230 | } | |
231 | ||
232 | static struct s3c_adc_bat main_bat = { | |
233 | .psy = { | |
234 | .name = "main-battery", | |
235 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
236 | .properties = s3c_adc_main_bat_props, | |
237 | .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props), | |
238 | .get_property = s3c_adc_bat_get_property, | |
239 | .external_power_changed = s3c_adc_bat_ext_power_changed, | |
240 | .use_for_apm = 1, | |
241 | }, | |
242 | }; | |
243 | ||
244 | static void s3c_adc_bat_work(struct work_struct *work) | |
245 | { | |
246 | struct s3c_adc_bat *bat = &main_bat; | |
247 | int is_charged; | |
248 | int is_plugged; | |
249 | static int was_plugged; | |
250 | ||
251 | is_plugged = power_supply_am_i_supplied(&bat->psy); | |
252 | bat->cable_plugged = is_plugged; | |
253 | if (is_plugged != was_plugged) { | |
254 | was_plugged = is_plugged; | |
255 | if (is_plugged) { | |
256 | if (bat->pdata->enable_charger) | |
257 | bat->pdata->enable_charger(); | |
258 | bat->status = POWER_SUPPLY_STATUS_CHARGING; | |
259 | } else { | |
260 | if (bat->pdata->disable_charger) | |
261 | bat->pdata->disable_charger(); | |
262 | bat->status = POWER_SUPPLY_STATUS_DISCHARGING; | |
263 | } | |
264 | } else { | |
265 | if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) { | |
c66ae9bb | 266 | is_charged = charge_finished(&main_bat); |
808be4b2 VK |
267 | if (is_charged) { |
268 | if (bat->pdata->disable_charger) | |
269 | bat->pdata->disable_charger(); | |
270 | bat->status = POWER_SUPPLY_STATUS_FULL; | |
271 | } else { | |
272 | if (bat->pdata->enable_charger) | |
273 | bat->pdata->enable_charger(); | |
274 | bat->status = POWER_SUPPLY_STATUS_CHARGING; | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
279 | power_supply_changed(&bat->psy); | |
280 | } | |
281 | ||
282 | static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id) | |
283 | { | |
284 | schedule_delayed_work(&bat_work, | |
285 | msecs_to_jiffies(JITTER_DELAY)); | |
286 | return IRQ_HANDLED; | |
287 | } | |
288 | ||
f704d45e | 289 | static int __devinit s3c_adc_bat_probe(struct platform_device *pdev) |
808be4b2 VK |
290 | { |
291 | struct s3c_adc_client *client; | |
292 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
293 | int ret; | |
294 | ||
295 | client = s3c_adc_register(pdev, NULL, NULL, 0); | |
296 | if (IS_ERR(client)) { | |
297 | dev_err(&pdev->dev, "cannot register adc\n"); | |
298 | return PTR_ERR(client); | |
299 | } | |
300 | ||
301 | platform_set_drvdata(pdev, client); | |
302 | ||
303 | main_bat.client = client; | |
304 | main_bat.pdata = pdata; | |
305 | main_bat.volt_value = -1; | |
306 | main_bat.cur_value = -1; | |
307 | main_bat.cable_plugged = 0; | |
308 | main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING; | |
309 | ||
310 | ret = power_supply_register(&pdev->dev, &main_bat.psy); | |
311 | if (ret) | |
312 | goto err_reg_main; | |
313 | if (pdata->backup_volt_mult) { | |
314 | backup_bat.client = client; | |
315 | backup_bat.pdata = pdev->dev.platform_data; | |
316 | backup_bat.volt_value = -1; | |
317 | ret = power_supply_register(&pdev->dev, &backup_bat.psy); | |
318 | if (ret) | |
319 | goto err_reg_backup; | |
320 | } | |
321 | ||
322 | INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work); | |
323 | ||
324 | if (pdata->gpio_charge_finished >= 0) { | |
325 | ret = gpio_request(pdata->gpio_charge_finished, "charged"); | |
326 | if (ret) | |
327 | goto err_gpio; | |
328 | ||
329 | ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished), | |
330 | s3c_adc_bat_charged, | |
331 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
332 | "battery charged", NULL); | |
333 | if (ret) | |
334 | goto err_irq; | |
335 | } | |
336 | ||
337 | if (pdata->init) { | |
338 | ret = pdata->init(); | |
339 | if (ret) | |
340 | goto err_platform; | |
341 | } | |
342 | ||
343 | dev_info(&pdev->dev, "successfully loaded\n"); | |
344 | device_init_wakeup(&pdev->dev, 1); | |
345 | ||
346 | /* Schedule timer to check current status */ | |
347 | schedule_delayed_work(&bat_work, | |
348 | msecs_to_jiffies(JITTER_DELAY)); | |
349 | ||
350 | return 0; | |
351 | ||
352 | err_platform: | |
353 | if (pdata->gpio_charge_finished >= 0) | |
354 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); | |
355 | err_irq: | |
356 | if (pdata->gpio_charge_finished >= 0) | |
357 | gpio_free(pdata->gpio_charge_finished); | |
358 | err_gpio: | |
359 | if (pdata->backup_volt_mult) | |
360 | power_supply_unregister(&backup_bat.psy); | |
361 | err_reg_backup: | |
362 | power_supply_unregister(&main_bat.psy); | |
363 | err_reg_main: | |
364 | return ret; | |
365 | } | |
366 | ||
367 | static int s3c_adc_bat_remove(struct platform_device *pdev) | |
368 | { | |
369 | struct s3c_adc_client *client = platform_get_drvdata(pdev); | |
370 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
371 | ||
372 | power_supply_unregister(&main_bat.psy); | |
373 | if (pdata->backup_volt_mult) | |
374 | power_supply_unregister(&backup_bat.psy); | |
375 | ||
376 | s3c_adc_release(client); | |
377 | ||
378 | if (pdata->gpio_charge_finished >= 0) { | |
379 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); | |
380 | gpio_free(pdata->gpio_charge_finished); | |
381 | } | |
382 | ||
383 | cancel_delayed_work(&bat_work); | |
384 | ||
385 | if (pdata->exit) | |
386 | pdata->exit(); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | #ifdef CONFIG_PM | |
392 | static int s3c_adc_bat_suspend(struct platform_device *pdev, | |
393 | pm_message_t state) | |
394 | { | |
395 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
396 | ||
397 | if (pdata->gpio_charge_finished >= 0) { | |
398 | if (device_may_wakeup(&pdev->dev)) | |
399 | enable_irq_wake( | |
400 | gpio_to_irq(pdata->gpio_charge_finished)); | |
401 | else { | |
402 | disable_irq(gpio_to_irq(pdata->gpio_charge_finished)); | |
403 | main_bat.pdata->disable_charger(); | |
404 | } | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | static int s3c_adc_bat_resume(struct platform_device *pdev) | |
411 | { | |
412 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
413 | ||
414 | if (pdata->gpio_charge_finished >= 0) { | |
415 | if (device_may_wakeup(&pdev->dev)) | |
416 | disable_irq_wake( | |
417 | gpio_to_irq(pdata->gpio_charge_finished)); | |
418 | else | |
419 | enable_irq(gpio_to_irq(pdata->gpio_charge_finished)); | |
420 | } | |
421 | ||
422 | /* Schedule timer to check current status */ | |
423 | schedule_delayed_work(&bat_work, | |
424 | msecs_to_jiffies(JITTER_DELAY)); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | #else | |
f8d878dd HS |
429 | #define s3c_adc_bat_suspend NULL |
430 | #define s3c_adc_bat_resume NULL | |
808be4b2 VK |
431 | #endif |
432 | ||
433 | static struct platform_driver s3c_adc_bat_driver = { | |
434 | .driver = { | |
435 | .name = "s3c-adc-battery", | |
436 | }, | |
437 | .probe = s3c_adc_bat_probe, | |
438 | .remove = s3c_adc_bat_remove, | |
439 | .suspend = s3c_adc_bat_suspend, | |
440 | .resume = s3c_adc_bat_resume, | |
441 | }; | |
442 | ||
300bac7f | 443 | module_platform_driver(s3c_adc_bat_driver); |
808be4b2 VK |
444 | |
445 | MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); | |
b595076a | 446 | MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver"); |
808be4b2 | 447 | MODULE_LICENSE("GPL"); |