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> | |
23 | ||
24 | #include <plat/adc.h> | |
25 | ||
26 | #define BAT_POLL_INTERVAL 10000 /* ms */ | |
27 | #define JITTER_DELAY 500 /* ms */ | |
28 | ||
29 | struct s3c_adc_bat { | |
30 | struct power_supply psy; | |
31 | struct s3c_adc_client *client; | |
32 | struct s3c_adc_bat_pdata *pdata; | |
33 | int volt_value; | |
34 | int cur_value; | |
35 | unsigned int timestamp; | |
36 | int level; | |
37 | int status; | |
38 | int cable_plugged:1; | |
39 | }; | |
40 | ||
41 | static struct delayed_work bat_work; | |
42 | ||
43 | static void s3c_adc_bat_ext_power_changed(struct power_supply *psy) | |
44 | { | |
45 | schedule_delayed_work(&bat_work, | |
46 | msecs_to_jiffies(JITTER_DELAY)); | |
47 | } | |
48 | ||
49 | static enum power_supply_property s3c_adc_backup_bat_props[] = { | |
50 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
51 | POWER_SUPPLY_PROP_VOLTAGE_MIN, | |
52 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, | |
53 | }; | |
54 | ||
55 | static int s3c_adc_backup_bat_get_property(struct power_supply *psy, | |
56 | enum power_supply_property psp, | |
57 | union power_supply_propval *val) | |
58 | { | |
59 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); | |
60 | ||
61 | if (!bat) { | |
62 | dev_err(psy->dev, "%s: no battery infos ?!\n", __func__); | |
63 | return -EINVAL; | |
64 | } | |
65 | ||
66 | if (bat->volt_value < 0 || | |
67 | jiffies_to_msecs(jiffies - bat->timestamp) > | |
68 | BAT_POLL_INTERVAL) { | |
69 | bat->volt_value = s3c_adc_read(bat->client, | |
70 | bat->pdata->backup_volt_channel); | |
71 | bat->volt_value *= bat->pdata->backup_volt_mult; | |
72 | bat->timestamp = jiffies; | |
73 | } | |
74 | ||
75 | switch (psp) { | |
76 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
77 | val->intval = bat->volt_value; | |
78 | return 0; | |
79 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
80 | val->intval = bat->pdata->backup_volt_min; | |
81 | return 0; | |
82 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
83 | val->intval = bat->pdata->backup_volt_max; | |
84 | return 0; | |
85 | default: | |
86 | return -EINVAL; | |
87 | } | |
88 | } | |
89 | ||
90 | static struct s3c_adc_bat backup_bat = { | |
91 | .psy = { | |
92 | .name = "backup-battery", | |
93 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
94 | .properties = s3c_adc_backup_bat_props, | |
95 | .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props), | |
96 | .get_property = s3c_adc_backup_bat_get_property, | |
97 | .use_for_apm = 1, | |
98 | }, | |
99 | }; | |
100 | ||
101 | static enum power_supply_property s3c_adc_main_bat_props[] = { | |
102 | POWER_SUPPLY_PROP_STATUS, | |
103 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
104 | POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, | |
105 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
106 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
107 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
108 | }; | |
109 | ||
110 | static int calc_full_volt(int volt_val, int cur_val, int impedance) | |
111 | { | |
112 | return volt_val + cur_val * impedance / 1000; | |
113 | } | |
114 | ||
c66ae9bb VK |
115 | static int charge_finished(struct s3c_adc_bat *bat) |
116 | { | |
117 | return bat->pdata->gpio_inverted ? | |
118 | !gpio_get_value(bat->pdata->gpio_charge_finished) : | |
119 | gpio_get_value(bat->pdata->gpio_charge_finished); | |
120 | } | |
121 | ||
808be4b2 VK |
122 | static int s3c_adc_bat_get_property(struct power_supply *psy, |
123 | enum power_supply_property psp, | |
124 | union power_supply_propval *val) | |
125 | { | |
126 | struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy); | |
127 | ||
128 | int new_level; | |
129 | int full_volt; | |
130 | const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac; | |
131 | unsigned int lut_size = bat->pdata->lut_noac_cnt; | |
132 | ||
133 | if (!bat) { | |
134 | dev_err(psy->dev, "no battery infos ?!\n"); | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | if (bat->volt_value < 0 || bat->cur_value < 0 || | |
139 | jiffies_to_msecs(jiffies - bat->timestamp) > | |
140 | BAT_POLL_INTERVAL) { | |
141 | bat->volt_value = s3c_adc_read(bat->client, | |
142 | bat->pdata->volt_channel) * bat->pdata->volt_mult; | |
143 | bat->cur_value = s3c_adc_read(bat->client, | |
144 | bat->pdata->current_channel) * bat->pdata->current_mult; | |
145 | bat->timestamp = jiffies; | |
146 | } | |
147 | ||
148 | if (bat->cable_plugged && | |
149 | ((bat->pdata->gpio_charge_finished < 0) || | |
c66ae9bb | 150 | !charge_finished(bat))) { |
808be4b2 VK |
151 | lut = bat->pdata->lut_acin; |
152 | lut_size = bat->pdata->lut_acin_cnt; | |
153 | } | |
154 | ||
155 | new_level = 100000; | |
156 | full_volt = calc_full_volt((bat->volt_value / 1000), | |
157 | (bat->cur_value / 1000), bat->pdata->internal_impedance); | |
158 | ||
159 | if (full_volt < calc_full_volt(lut->volt, lut->cur, | |
160 | bat->pdata->internal_impedance)) { | |
161 | lut_size--; | |
162 | while (lut_size--) { | |
163 | int lut_volt1; | |
164 | int lut_volt2; | |
165 | ||
166 | lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur, | |
167 | bat->pdata->internal_impedance); | |
168 | lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur, | |
169 | bat->pdata->internal_impedance); | |
170 | if (full_volt < lut_volt1 && full_volt >= lut_volt2) { | |
171 | new_level = (lut[1].level + | |
172 | (lut[0].level - lut[1].level) * | |
173 | (full_volt - lut_volt2) / | |
174 | (lut_volt1 - lut_volt2)) * 1000; | |
175 | break; | |
176 | } | |
177 | new_level = lut[1].level * 1000; | |
178 | lut++; | |
179 | } | |
180 | } | |
181 | ||
182 | bat->level = new_level; | |
183 | ||
184 | switch (psp) { | |
185 | case POWER_SUPPLY_PROP_STATUS: | |
186 | if (bat->pdata->gpio_charge_finished < 0) | |
187 | val->intval = bat->level == 100000 ? | |
188 | POWER_SUPPLY_STATUS_FULL : bat->status; | |
189 | else | |
190 | val->intval = bat->status; | |
191 | return 0; | |
192 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
193 | val->intval = 100000; | |
194 | return 0; | |
195 | case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: | |
196 | val->intval = 0; | |
197 | return 0; | |
198 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
199 | val->intval = bat->level; | |
200 | return 0; | |
201 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
202 | val->intval = bat->volt_value; | |
203 | return 0; | |
204 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
205 | val->intval = bat->cur_value; | |
206 | return 0; | |
207 | default: | |
208 | return -EINVAL; | |
209 | } | |
210 | } | |
211 | ||
212 | static struct s3c_adc_bat main_bat = { | |
213 | .psy = { | |
214 | .name = "main-battery", | |
215 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
216 | .properties = s3c_adc_main_bat_props, | |
217 | .num_properties = ARRAY_SIZE(s3c_adc_main_bat_props), | |
218 | .get_property = s3c_adc_bat_get_property, | |
219 | .external_power_changed = s3c_adc_bat_ext_power_changed, | |
220 | .use_for_apm = 1, | |
221 | }, | |
222 | }; | |
223 | ||
224 | static void s3c_adc_bat_work(struct work_struct *work) | |
225 | { | |
226 | struct s3c_adc_bat *bat = &main_bat; | |
227 | int is_charged; | |
228 | int is_plugged; | |
229 | static int was_plugged; | |
230 | ||
231 | is_plugged = power_supply_am_i_supplied(&bat->psy); | |
232 | bat->cable_plugged = is_plugged; | |
233 | if (is_plugged != was_plugged) { | |
234 | was_plugged = is_plugged; | |
235 | if (is_plugged) { | |
236 | if (bat->pdata->enable_charger) | |
237 | bat->pdata->enable_charger(); | |
238 | bat->status = POWER_SUPPLY_STATUS_CHARGING; | |
239 | } else { | |
240 | if (bat->pdata->disable_charger) | |
241 | bat->pdata->disable_charger(); | |
242 | bat->status = POWER_SUPPLY_STATUS_DISCHARGING; | |
243 | } | |
244 | } else { | |
245 | if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) { | |
c66ae9bb | 246 | is_charged = charge_finished(&main_bat); |
808be4b2 VK |
247 | if (is_charged) { |
248 | if (bat->pdata->disable_charger) | |
249 | bat->pdata->disable_charger(); | |
250 | bat->status = POWER_SUPPLY_STATUS_FULL; | |
251 | } else { | |
252 | if (bat->pdata->enable_charger) | |
253 | bat->pdata->enable_charger(); | |
254 | bat->status = POWER_SUPPLY_STATUS_CHARGING; | |
255 | } | |
256 | } | |
257 | } | |
258 | ||
259 | power_supply_changed(&bat->psy); | |
260 | } | |
261 | ||
262 | static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id) | |
263 | { | |
264 | schedule_delayed_work(&bat_work, | |
265 | msecs_to_jiffies(JITTER_DELAY)); | |
266 | return IRQ_HANDLED; | |
267 | } | |
268 | ||
269 | static int __init s3c_adc_bat_probe(struct platform_device *pdev) | |
270 | { | |
271 | struct s3c_adc_client *client; | |
272 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
273 | int ret; | |
274 | ||
275 | client = s3c_adc_register(pdev, NULL, NULL, 0); | |
276 | if (IS_ERR(client)) { | |
277 | dev_err(&pdev->dev, "cannot register adc\n"); | |
278 | return PTR_ERR(client); | |
279 | } | |
280 | ||
281 | platform_set_drvdata(pdev, client); | |
282 | ||
283 | main_bat.client = client; | |
284 | main_bat.pdata = pdata; | |
285 | main_bat.volt_value = -1; | |
286 | main_bat.cur_value = -1; | |
287 | main_bat.cable_plugged = 0; | |
288 | main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING; | |
289 | ||
290 | ret = power_supply_register(&pdev->dev, &main_bat.psy); | |
291 | if (ret) | |
292 | goto err_reg_main; | |
293 | if (pdata->backup_volt_mult) { | |
294 | backup_bat.client = client; | |
295 | backup_bat.pdata = pdev->dev.platform_data; | |
296 | backup_bat.volt_value = -1; | |
297 | ret = power_supply_register(&pdev->dev, &backup_bat.psy); | |
298 | if (ret) | |
299 | goto err_reg_backup; | |
300 | } | |
301 | ||
302 | INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work); | |
303 | ||
304 | if (pdata->gpio_charge_finished >= 0) { | |
305 | ret = gpio_request(pdata->gpio_charge_finished, "charged"); | |
306 | if (ret) | |
307 | goto err_gpio; | |
308 | ||
309 | ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished), | |
310 | s3c_adc_bat_charged, | |
311 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
312 | "battery charged", NULL); | |
313 | if (ret) | |
314 | goto err_irq; | |
315 | } | |
316 | ||
317 | if (pdata->init) { | |
318 | ret = pdata->init(); | |
319 | if (ret) | |
320 | goto err_platform; | |
321 | } | |
322 | ||
323 | dev_info(&pdev->dev, "successfully loaded\n"); | |
324 | device_init_wakeup(&pdev->dev, 1); | |
325 | ||
326 | /* Schedule timer to check current status */ | |
327 | schedule_delayed_work(&bat_work, | |
328 | msecs_to_jiffies(JITTER_DELAY)); | |
329 | ||
330 | return 0; | |
331 | ||
332 | err_platform: | |
333 | if (pdata->gpio_charge_finished >= 0) | |
334 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); | |
335 | err_irq: | |
336 | if (pdata->gpio_charge_finished >= 0) | |
337 | gpio_free(pdata->gpio_charge_finished); | |
338 | err_gpio: | |
339 | if (pdata->backup_volt_mult) | |
340 | power_supply_unregister(&backup_bat.psy); | |
341 | err_reg_backup: | |
342 | power_supply_unregister(&main_bat.psy); | |
343 | err_reg_main: | |
344 | return ret; | |
345 | } | |
346 | ||
347 | static int s3c_adc_bat_remove(struct platform_device *pdev) | |
348 | { | |
349 | struct s3c_adc_client *client = platform_get_drvdata(pdev); | |
350 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
351 | ||
352 | power_supply_unregister(&main_bat.psy); | |
353 | if (pdata->backup_volt_mult) | |
354 | power_supply_unregister(&backup_bat.psy); | |
355 | ||
356 | s3c_adc_release(client); | |
357 | ||
358 | if (pdata->gpio_charge_finished >= 0) { | |
359 | free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL); | |
360 | gpio_free(pdata->gpio_charge_finished); | |
361 | } | |
362 | ||
363 | cancel_delayed_work(&bat_work); | |
364 | ||
365 | if (pdata->exit) | |
366 | pdata->exit(); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | #ifdef CONFIG_PM | |
372 | static int s3c_adc_bat_suspend(struct platform_device *pdev, | |
373 | pm_message_t state) | |
374 | { | |
375 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
376 | ||
377 | if (pdata->gpio_charge_finished >= 0) { | |
378 | if (device_may_wakeup(&pdev->dev)) | |
379 | enable_irq_wake( | |
380 | gpio_to_irq(pdata->gpio_charge_finished)); | |
381 | else { | |
382 | disable_irq(gpio_to_irq(pdata->gpio_charge_finished)); | |
383 | main_bat.pdata->disable_charger(); | |
384 | } | |
385 | } | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int s3c_adc_bat_resume(struct platform_device *pdev) | |
391 | { | |
392 | struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data; | |
393 | ||
394 | if (pdata->gpio_charge_finished >= 0) { | |
395 | if (device_may_wakeup(&pdev->dev)) | |
396 | disable_irq_wake( | |
397 | gpio_to_irq(pdata->gpio_charge_finished)); | |
398 | else | |
399 | enable_irq(gpio_to_irq(pdata->gpio_charge_finished)); | |
400 | } | |
401 | ||
402 | /* Schedule timer to check current status */ | |
403 | schedule_delayed_work(&bat_work, | |
404 | msecs_to_jiffies(JITTER_DELAY)); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | #else | |
f8d878dd HS |
409 | #define s3c_adc_bat_suspend NULL |
410 | #define s3c_adc_bat_resume NULL | |
808be4b2 VK |
411 | #endif |
412 | ||
413 | static struct platform_driver s3c_adc_bat_driver = { | |
414 | .driver = { | |
415 | .name = "s3c-adc-battery", | |
416 | }, | |
417 | .probe = s3c_adc_bat_probe, | |
418 | .remove = s3c_adc_bat_remove, | |
419 | .suspend = s3c_adc_bat_suspend, | |
420 | .resume = s3c_adc_bat_resume, | |
421 | }; | |
422 | ||
423 | static int __init s3c_adc_bat_init(void) | |
424 | { | |
425 | return platform_driver_register(&s3c_adc_bat_driver); | |
426 | } | |
427 | module_init(s3c_adc_bat_init); | |
428 | ||
429 | static void __exit s3c_adc_bat_exit(void) | |
430 | { | |
431 | platform_driver_unregister(&s3c_adc_bat_driver); | |
432 | } | |
433 | module_exit(s3c_adc_bat_exit); | |
434 | ||
435 | MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>"); | |
b595076a | 436 | MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver"); |
808be4b2 | 437 | MODULE_LICENSE("GPL"); |