1 /*
2 * Battery and Power Management code for the Sharp SL-6000x
3 *
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2008 Dmitry Baryshkov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/power_supply.h>
15 #include <linux/wm97xx.h>
16 #include <linux/delay.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/gpio.h>
20
21 #include <asm/mach-types.h>
22 #include <mach/tosa.h>
23
24 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
25 static struct work_struct bat_work;
26
27 struct tosa_bat {
28 int status;
29 struct power_supply psy;
30 int full_chrg;
31
32 struct mutex work_lock; /* protects data */
33
34 bool (*is_present)(struct tosa_bat *bat);
35 int gpio_full;
36 int gpio_charge_off;
37
38 int technology;
39
40 int gpio_bat;
41 int adc_bat;
42 int adc_bat_divider;
43 int bat_max;
44 int bat_min;
45
46 int gpio_temp;
47 int adc_temp;
48 int adc_temp_divider;
49 };
50
51 static struct tosa_bat tosa_bat_main;
52 static struct tosa_bat tosa_bat_jacket;
53
tosa_read_bat(struct tosa_bat * bat)54 static unsigned long tosa_read_bat(struct tosa_bat *bat)
55 {
56 unsigned long value = 0;
57
58 if (bat->gpio_bat < 0 || bat->adc_bat < 0)
59 return 0;
60
61 mutex_lock(&bat_lock);
62 gpio_set_value(bat->gpio_bat, 1);
63 msleep(5);
64 value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
65 bat->adc_bat);
66 gpio_set_value(bat->gpio_bat, 0);
67 mutex_unlock(&bat_lock);
68
69 value = value * 1000000 / bat->adc_bat_divider;
70
71 return value;
72 }
73
tosa_read_temp(struct tosa_bat * bat)74 static unsigned long tosa_read_temp(struct tosa_bat *bat)
75 {
76 unsigned long value = 0;
77
78 if (bat->gpio_temp < 0 || bat->adc_temp < 0)
79 return 0;
80
81 mutex_lock(&bat_lock);
82 gpio_set_value(bat->gpio_temp, 1);
83 msleep(5);
84 value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy.dev->parent),
85 bat->adc_temp);
86 gpio_set_value(bat->gpio_temp, 0);
87 mutex_unlock(&bat_lock);
88
89 value = value * 10000 / bat->adc_temp_divider;
90
91 return value;
92 }
93
tosa_bat_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)94 static int tosa_bat_get_property(struct power_supply *psy,
95 enum power_supply_property psp,
96 union power_supply_propval *val)
97 {
98 int ret = 0;
99 struct tosa_bat *bat = container_of(psy, struct tosa_bat, psy);
100
101 if (bat->is_present && !bat->is_present(bat)
102 && psp != POWER_SUPPLY_PROP_PRESENT) {
103 return -ENODEV;
104 }
105
106 switch (psp) {
107 case POWER_SUPPLY_PROP_STATUS:
108 val->intval = bat->status;
109 break;
110 case POWER_SUPPLY_PROP_TECHNOLOGY:
111 val->intval = bat->technology;
112 break;
113 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
114 val->intval = tosa_read_bat(bat);
115 break;
116 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
117 if (bat->full_chrg == -1)
118 val->intval = bat->bat_max;
119 else
120 val->intval = bat->full_chrg;
121 break;
122 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
123 val->intval = bat->bat_max;
124 break;
125 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
126 val->intval = bat->bat_min;
127 break;
128 case POWER_SUPPLY_PROP_TEMP:
129 val->intval = tosa_read_temp(bat);
130 break;
131 case POWER_SUPPLY_PROP_PRESENT:
132 val->intval = bat->is_present ? bat->is_present(bat) : 1;
133 break;
134 default:
135 ret = -EINVAL;
136 break;
137 }
138 return ret;
139 }
140
tosa_jacket_bat_is_present(struct tosa_bat * bat)141 static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
142 {
143 return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
144 }
145
tosa_bat_external_power_changed(struct power_supply * psy)146 static void tosa_bat_external_power_changed(struct power_supply *psy)
147 {
148 schedule_work(&bat_work);
149 }
150
tosa_bat_gpio_isr(int irq,void * data)151 static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
152 {
153 pr_info("tosa_bat_gpio irq: %d\n", gpio_get_value(irq_to_gpio(irq)));
154 schedule_work(&bat_work);
155 return IRQ_HANDLED;
156 }
157
tosa_bat_update(struct tosa_bat * bat)158 static void tosa_bat_update(struct tosa_bat *bat)
159 {
160 int old;
161 struct power_supply *psy = &bat->psy;
162
163 mutex_lock(&bat->work_lock);
164
165 old = bat->status;
166
167 if (bat->is_present && !bat->is_present(bat)) {
168 printk(KERN_NOTICE "%s not present\n", psy->name);
169 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
170 bat->full_chrg = -1;
171 } else if (power_supply_am_i_supplied(psy)) {
172 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
173 gpio_set_value(bat->gpio_charge_off, 0);
174 mdelay(15);
175 }
176
177 if (gpio_get_value(bat->gpio_full)) {
178 if (old == POWER_SUPPLY_STATUS_CHARGING ||
179 bat->full_chrg == -1)
180 bat->full_chrg = tosa_read_bat(bat);
181
182 gpio_set_value(bat->gpio_charge_off, 1);
183 bat->status = POWER_SUPPLY_STATUS_FULL;
184 } else {
185 gpio_set_value(bat->gpio_charge_off, 0);
186 bat->status = POWER_SUPPLY_STATUS_CHARGING;
187 }
188 } else {
189 gpio_set_value(bat->gpio_charge_off, 1);
190 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
191 }
192
193 if (old != bat->status)
194 power_supply_changed(psy);
195
196 mutex_unlock(&bat->work_lock);
197 }
198
tosa_bat_work(struct work_struct * work)199 static void tosa_bat_work(struct work_struct *work)
200 {
201 tosa_bat_update(&tosa_bat_main);
202 tosa_bat_update(&tosa_bat_jacket);
203 }
204
205
206 static enum power_supply_property tosa_bat_main_props[] = {
207 POWER_SUPPLY_PROP_STATUS,
208 POWER_SUPPLY_PROP_TECHNOLOGY,
209 POWER_SUPPLY_PROP_VOLTAGE_NOW,
210 POWER_SUPPLY_PROP_VOLTAGE_MAX,
211 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212 POWER_SUPPLY_PROP_TEMP,
213 POWER_SUPPLY_PROP_PRESENT,
214 };
215
216 static enum power_supply_property tosa_bat_bu_props[] = {
217 POWER_SUPPLY_PROP_STATUS,
218 POWER_SUPPLY_PROP_TECHNOLOGY,
219 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
220 POWER_SUPPLY_PROP_VOLTAGE_NOW,
221 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
222 POWER_SUPPLY_PROP_PRESENT,
223 };
224
225 static struct tosa_bat tosa_bat_main = {
226 .status = POWER_SUPPLY_STATUS_DISCHARGING,
227 .full_chrg = -1,
228 .psy = {
229 .name = "main-battery",
230 .type = POWER_SUPPLY_TYPE_BATTERY,
231 .properties = tosa_bat_main_props,
232 .num_properties = ARRAY_SIZE(tosa_bat_main_props),
233 .get_property = tosa_bat_get_property,
234 .external_power_changed = tosa_bat_external_power_changed,
235 .use_for_apm = 1,
236 },
237
238 .gpio_full = TOSA_GPIO_BAT0_CRG,
239 .gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
240
241 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
242
243 .gpio_bat = TOSA_GPIO_BAT0_V_ON,
244 .adc_bat = WM97XX_AUX_ID3,
245 .adc_bat_divider = 414,
246 .bat_max = 4310000,
247 .bat_min = 1551 * 1000000 / 414,
248
249 .gpio_temp = TOSA_GPIO_BAT1_TH_ON,
250 .adc_temp = WM97XX_AUX_ID2,
251 .adc_temp_divider = 10000,
252 };
253
254 static struct tosa_bat tosa_bat_jacket = {
255 .status = POWER_SUPPLY_STATUS_DISCHARGING,
256 .full_chrg = -1,
257 .psy = {
258 .name = "jacket-battery",
259 .type = POWER_SUPPLY_TYPE_BATTERY,
260 .properties = tosa_bat_main_props,
261 .num_properties = ARRAY_SIZE(tosa_bat_main_props),
262 .get_property = tosa_bat_get_property,
263 .external_power_changed = tosa_bat_external_power_changed,
264 },
265
266 .is_present = tosa_jacket_bat_is_present,
267 .gpio_full = TOSA_GPIO_BAT1_CRG,
268 .gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
269
270 .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
271
272 .gpio_bat = TOSA_GPIO_BAT1_V_ON,
273 .adc_bat = WM97XX_AUX_ID3,
274 .adc_bat_divider = 414,
275 .bat_max = 4310000,
276 .bat_min = 1551 * 1000000 / 414,
277
278 .gpio_temp = TOSA_GPIO_BAT0_TH_ON,
279 .adc_temp = WM97XX_AUX_ID2,
280 .adc_temp_divider = 10000,
281 };
282
283 static struct tosa_bat tosa_bat_bu = {
284 .status = POWER_SUPPLY_STATUS_UNKNOWN,
285 .full_chrg = -1,
286
287 .psy = {
288 .name = "backup-battery",
289 .type = POWER_SUPPLY_TYPE_BATTERY,
290 .properties = tosa_bat_bu_props,
291 .num_properties = ARRAY_SIZE(tosa_bat_bu_props),
292 .get_property = tosa_bat_get_property,
293 .external_power_changed = tosa_bat_external_power_changed,
294 },
295
296 .gpio_full = -1,
297 .gpio_charge_off = -1,
298
299 .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
300
301 .gpio_bat = TOSA_GPIO_BU_CHRG_ON,
302 .adc_bat = WM97XX_AUX_ID4,
303 .adc_bat_divider = 1266,
304
305 .gpio_temp = -1,
306 .adc_temp = -1,
307 .adc_temp_divider = -1,
308 };
309
310 static struct {
311 int gpio;
312 char *name;
313 bool output;
314 int value;
315 } gpios[] = {
316 { TOSA_GPIO_CHARGE_OFF, "main charge off", 1, 1 },
317 { TOSA_GPIO_CHARGE_OFF_JC, "jacket charge off", 1, 1 },
318 { TOSA_GPIO_BAT_SW_ON, "battery switch", 1, 0 },
319 { TOSA_GPIO_BAT0_V_ON, "main battery", 1, 0 },
320 { TOSA_GPIO_BAT1_V_ON, "jacket battery", 1, 0 },
321 { TOSA_GPIO_BAT1_TH_ON, "main battery temp", 1, 0 },
322 { TOSA_GPIO_BAT0_TH_ON, "jacket battery temp", 1, 0 },
323 { TOSA_GPIO_BU_CHRG_ON, "backup battery", 1, 0 },
324 { TOSA_GPIO_BAT0_CRG, "main battery full", 0, 0 },
325 { TOSA_GPIO_BAT1_CRG, "jacket battery full", 0, 0 },
326 { TOSA_GPIO_BAT0_LOW, "main battery low", 0, 0 },
327 { TOSA_GPIO_BAT1_LOW, "jacket battery low", 0, 0 },
328 { TOSA_GPIO_JACKET_DETECT, "jacket detect", 0, 0 },
329 };
330
331 #ifdef CONFIG_PM
tosa_bat_suspend(struct platform_device * dev,pm_message_t state)332 static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
333 {
334 /* flush all pending status updates */
335 flush_work_sync(&bat_work);
336 return 0;
337 }
338
tosa_bat_resume(struct platform_device * dev)339 static int tosa_bat_resume(struct platform_device *dev)
340 {
341 /* things may have changed while we were away */
342 schedule_work(&bat_work);
343 return 0;
344 }
345 #else
346 #define tosa_bat_suspend NULL
347 #define tosa_bat_resume NULL
348 #endif
349
tosa_bat_probe(struct platform_device * dev)350 static int __devinit tosa_bat_probe(struct platform_device *dev)
351 {
352 int ret;
353 int i;
354
355 if (!machine_is_tosa())
356 return -ENODEV;
357
358 for (i = 0; i < ARRAY_SIZE(gpios); i++) {
359 ret = gpio_request(gpios[i].gpio, gpios[i].name);
360 if (ret) {
361 i--;
362 goto err_gpio;
363 }
364
365 if (gpios[i].output)
366 ret = gpio_direction_output(gpios[i].gpio,
367 gpios[i].value);
368 else
369 ret = gpio_direction_input(gpios[i].gpio);
370
371 if (ret)
372 goto err_gpio;
373 }
374
375 mutex_init(&tosa_bat_main.work_lock);
376 mutex_init(&tosa_bat_jacket.work_lock);
377
378 INIT_WORK(&bat_work, tosa_bat_work);
379
380 ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
381 if (ret)
382 goto err_psy_reg_main;
383 ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
384 if (ret)
385 goto err_psy_reg_jacket;
386 ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
387 if (ret)
388 goto err_psy_reg_bu;
389
390 ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
391 tosa_bat_gpio_isr,
392 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
393 "main full", &tosa_bat_main);
394 if (ret)
395 goto err_req_main;
396
397 ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
398 tosa_bat_gpio_isr,
399 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
400 "jacket full", &tosa_bat_jacket);
401 if (ret)
402 goto err_req_jacket;
403
404 ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
405 tosa_bat_gpio_isr,
406 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
407 "jacket detect", &tosa_bat_jacket);
408 if (!ret) {
409 schedule_work(&bat_work);
410 return 0;
411 }
412
413 free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
414 err_req_jacket:
415 free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
416 err_req_main:
417 power_supply_unregister(&tosa_bat_bu.psy);
418 err_psy_reg_bu:
419 power_supply_unregister(&tosa_bat_jacket.psy);
420 err_psy_reg_jacket:
421 power_supply_unregister(&tosa_bat_main.psy);
422 err_psy_reg_main:
423
424 /* see comment in tosa_bat_remove */
425 cancel_work_sync(&bat_work);
426
427 i--;
428 err_gpio:
429 for (; i >= 0; i--)
430 gpio_free(gpios[i].gpio);
431
432 return ret;
433 }
434
tosa_bat_remove(struct platform_device * dev)435 static int __devexit tosa_bat_remove(struct platform_device *dev)
436 {
437 int i;
438
439 free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
440 free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
441 free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
442
443 power_supply_unregister(&tosa_bat_bu.psy);
444 power_supply_unregister(&tosa_bat_jacket.psy);
445 power_supply_unregister(&tosa_bat_main.psy);
446
447 /*
448 * Now cancel the bat_work. We won't get any more schedules,
449 * since all sources (isr and external_power_changed) are
450 * unregistered now.
451 */
452 cancel_work_sync(&bat_work);
453
454 for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
455 gpio_free(gpios[i].gpio);
456
457 return 0;
458 }
459
460 static struct platform_driver tosa_bat_driver = {
461 .driver.name = "wm97xx-battery",
462 .driver.owner = THIS_MODULE,
463 .probe = tosa_bat_probe,
464 .remove = __devexit_p(tosa_bat_remove),
465 .suspend = tosa_bat_suspend,
466 .resume = tosa_bat_resume,
467 };
468
tosa_bat_init(void)469 static int __init tosa_bat_init(void)
470 {
471 return platform_driver_register(&tosa_bat_driver);
472 }
473
tosa_bat_exit(void)474 static void __exit tosa_bat_exit(void)
475 {
476 platform_driver_unregister(&tosa_bat_driver);
477 }
478
479 module_init(tosa_bat_init);
480 module_exit(tosa_bat_exit);
481
482 MODULE_LICENSE("GPL");
483 MODULE_AUTHOR("Dmitry Baryshkov");
484 MODULE_DESCRIPTION("Tosa battery driver");
485 MODULE_ALIAS("platform:wm97xx-battery");
486