Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/power/tosa_battery.c

  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 
 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 
 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 
 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 = power_supply_get_drvdata(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 
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 
146 static void tosa_bat_external_power_changed(struct power_supply *psy)
147 {
148         schedule_work(&bat_work);
149 }
150 
151 static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
152 {
153         pr_info("tosa_bat_gpio irq\n");
154         schedule_work(&bat_work);
155         return IRQ_HANDLED;
156 }
157 
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->desc->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 
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 const struct power_supply_desc tosa_bat_main_desc = {
226         .name           = "main-battery",
227         .type           = POWER_SUPPLY_TYPE_BATTERY,
228         .properties     = tosa_bat_main_props,
229         .num_properties = ARRAY_SIZE(tosa_bat_main_props),
230         .get_property   = tosa_bat_get_property,
231         .external_power_changed = tosa_bat_external_power_changed,
232         .use_for_apm    = 1,
233 };
234 
235 static const struct power_supply_desc tosa_bat_jacket_desc = {
236         .name           = "jacket-battery",
237         .type           = POWER_SUPPLY_TYPE_BATTERY,
238         .properties     = tosa_bat_main_props,
239         .num_properties = ARRAY_SIZE(tosa_bat_main_props),
240         .get_property   = tosa_bat_get_property,
241         .external_power_changed = tosa_bat_external_power_changed,
242 };
243 
244 static const struct power_supply_desc tosa_bat_bu_desc = {
245         .name           = "backup-battery",
246         .type           = POWER_SUPPLY_TYPE_BATTERY,
247         .properties     = tosa_bat_bu_props,
248         .num_properties = ARRAY_SIZE(tosa_bat_bu_props),
249         .get_property   = tosa_bat_get_property,
250         .external_power_changed = tosa_bat_external_power_changed,
251 };
252 
253 static struct tosa_bat tosa_bat_main = {
254         .status = POWER_SUPPLY_STATUS_DISCHARGING,
255         .full_chrg = -1,
256         .psy = NULL,
257 
258         .gpio_full = TOSA_GPIO_BAT0_CRG,
259         .gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
260 
261         .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
262 
263         .gpio_bat = TOSA_GPIO_BAT0_V_ON,
264         .adc_bat = WM97XX_AUX_ID3,
265         .adc_bat_divider = 414,
266         .bat_max = 4310000,
267         .bat_min = 1551 * 1000000 / 414,
268 
269         .gpio_temp = TOSA_GPIO_BAT1_TH_ON,
270         .adc_temp = WM97XX_AUX_ID2,
271         .adc_temp_divider = 10000,
272 };
273 
274 static struct tosa_bat tosa_bat_jacket = {
275         .status = POWER_SUPPLY_STATUS_DISCHARGING,
276         .full_chrg = -1,
277         .psy = NULL,
278 
279         .is_present = tosa_jacket_bat_is_present,
280         .gpio_full = TOSA_GPIO_BAT1_CRG,
281         .gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
282 
283         .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
284 
285         .gpio_bat = TOSA_GPIO_BAT1_V_ON,
286         .adc_bat = WM97XX_AUX_ID3,
287         .adc_bat_divider = 414,
288         .bat_max = 4310000,
289         .bat_min = 1551 * 1000000 / 414,
290 
291         .gpio_temp = TOSA_GPIO_BAT0_TH_ON,
292         .adc_temp = WM97XX_AUX_ID2,
293         .adc_temp_divider = 10000,
294 };
295 
296 static struct tosa_bat tosa_bat_bu = {
297         .status = POWER_SUPPLY_STATUS_UNKNOWN,
298         .full_chrg = -1,
299         .psy = NULL,
300 
301         .gpio_full = -1,
302         .gpio_charge_off = -1,
303 
304         .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
305 
306         .gpio_bat = TOSA_GPIO_BU_CHRG_ON,
307         .adc_bat = WM97XX_AUX_ID4,
308         .adc_bat_divider = 1266,
309 
310         .gpio_temp = -1,
311         .adc_temp = -1,
312         .adc_temp_divider = -1,
313 };
314 
315 static struct gpio tosa_bat_gpios[] = {
316         { TOSA_GPIO_CHARGE_OFF,    GPIOF_OUT_INIT_HIGH, "main charge off" },
317         { TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
318         { TOSA_GPIO_BAT_SW_ON,     GPIOF_OUT_INIT_LOW,  "battery switch" },
319         { TOSA_GPIO_BAT0_V_ON,     GPIOF_OUT_INIT_LOW,  "main battery" },
320         { TOSA_GPIO_BAT1_V_ON,     GPIOF_OUT_INIT_LOW,  "jacket battery" },
321         { TOSA_GPIO_BAT1_TH_ON,    GPIOF_OUT_INIT_LOW,  "main battery temp" },
322         { TOSA_GPIO_BAT0_TH_ON,    GPIOF_OUT_INIT_LOW,  "jacket battery temp" },
323         { TOSA_GPIO_BU_CHRG_ON,    GPIOF_OUT_INIT_LOW,  "backup battery" },
324         { TOSA_GPIO_BAT0_CRG,      GPIOF_IN,            "main battery full" },
325         { TOSA_GPIO_BAT1_CRG,      GPIOF_IN,            "jacket battery full" },
326         { TOSA_GPIO_BAT0_LOW,      GPIOF_IN,            "main battery low" },
327         { TOSA_GPIO_BAT1_LOW,      GPIOF_IN,            "jacket battery low" },
328         { TOSA_GPIO_JACKET_DETECT, GPIOF_IN,            "jacket detect" },
329 };
330 
331 #ifdef CONFIG_PM
332 static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
333 {
334         /* flush all pending status updates */
335         flush_work(&bat_work);
336         return 0;
337 }
338 
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 
350 static int tosa_bat_probe(struct platform_device *dev)
351 {
352         int ret;
353         struct power_supply_config main_psy_cfg = {},
354                                    jacket_psy_cfg = {},
355                                    bu_psy_cfg = {};
356 
357         if (!machine_is_tosa())
358                 return -ENODEV;
359 
360         ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
361         if (ret)
362                 return ret;
363 
364         mutex_init(&tosa_bat_main.work_lock);
365         mutex_init(&tosa_bat_jacket.work_lock);
366 
367         INIT_WORK(&bat_work, tosa_bat_work);
368 
369         main_psy_cfg.drv_data = &tosa_bat_main;
370         tosa_bat_main.psy = power_supply_register(&dev->dev,
371                                                   &tosa_bat_main_desc,
372                                                   &main_psy_cfg);
373         if (IS_ERR(tosa_bat_main.psy)) {
374                 ret = PTR_ERR(tosa_bat_main.psy);
375                 goto err_psy_reg_main;
376         }
377 
378         jacket_psy_cfg.drv_data = &tosa_bat_jacket;
379         tosa_bat_jacket.psy = power_supply_register(&dev->dev,
380                                                     &tosa_bat_jacket_desc,
381                                                     &jacket_psy_cfg);
382         if (IS_ERR(tosa_bat_jacket.psy)) {
383                 ret = PTR_ERR(tosa_bat_jacket.psy);
384                 goto err_psy_reg_jacket;
385         }
386 
387         bu_psy_cfg.drv_data = &tosa_bat_bu;
388         tosa_bat_bu.psy = power_supply_register(&dev->dev, &tosa_bat_bu_desc,
389                                                 &bu_psy_cfg);
390         if (IS_ERR(tosa_bat_bu.psy)) {
391                 ret = PTR_ERR(tosa_bat_bu.psy);
392                 goto err_psy_reg_bu;
393         }
394 
395         ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
396                                 tosa_bat_gpio_isr,
397                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
398                                 "main full", &tosa_bat_main);
399         if (ret)
400                 goto err_req_main;
401 
402         ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
403                                 tosa_bat_gpio_isr,
404                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
405                                 "jacket full", &tosa_bat_jacket);
406         if (ret)
407                 goto err_req_jacket;
408 
409         ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
410                                 tosa_bat_gpio_isr,
411                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
412                                 "jacket detect", &tosa_bat_jacket);
413         if (!ret) {
414                 schedule_work(&bat_work);
415                 return 0;
416         }
417 
418         free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
419 err_req_jacket:
420         free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
421 err_req_main:
422         power_supply_unregister(tosa_bat_bu.psy);
423 err_psy_reg_bu:
424         power_supply_unregister(tosa_bat_jacket.psy);
425 err_psy_reg_jacket:
426         power_supply_unregister(tosa_bat_main.psy);
427 err_psy_reg_main:
428 
429         /* see comment in tosa_bat_remove */
430         cancel_work_sync(&bat_work);
431 
432         gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
433         return ret;
434 }
435 
436 static int tosa_bat_remove(struct platform_device *dev)
437 {
438         free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
439         free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
440         free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
441 
442         power_supply_unregister(tosa_bat_bu.psy);
443         power_supply_unregister(tosa_bat_jacket.psy);
444         power_supply_unregister(tosa_bat_main.psy);
445 
446         /*
447          * Now cancel the bat_work.  We won't get any more schedules,
448          * since all sources (isr and external_power_changed) are
449          * unregistered now.
450          */
451         cancel_work_sync(&bat_work);
452         gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
453         return 0;
454 }
455 
456 static struct platform_driver tosa_bat_driver = {
457         .driver.name    = "wm97xx-battery",
458         .driver.owner   = THIS_MODULE,
459         .probe          = tosa_bat_probe,
460         .remove         = tosa_bat_remove,
461         .suspend        = tosa_bat_suspend,
462         .resume         = tosa_bat_resume,
463 };
464 
465 module_platform_driver(tosa_bat_driver);
466 
467 MODULE_LICENSE("GPL");
468 MODULE_AUTHOR("Dmitry Baryshkov");
469 MODULE_DESCRIPTION("Tosa battery driver");
470 MODULE_ALIAS("platform:wm97xx-battery");
471 

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