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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 = 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 
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->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 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 gpio tosa_bat_gpios[] = {
311         { TOSA_GPIO_CHARGE_OFF,    GPIOF_OUT_INIT_HIGH, "main charge off" },
312         { TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
313         { TOSA_GPIO_BAT_SW_ON,     GPIOF_OUT_INIT_LOW,  "battery switch" },
314         { TOSA_GPIO_BAT0_V_ON,     GPIOF_OUT_INIT_LOW,  "main battery" },
315         { TOSA_GPIO_BAT1_V_ON,     GPIOF_OUT_INIT_LOW,  "jacket battery" },
316         { TOSA_GPIO_BAT1_TH_ON,    GPIOF_OUT_INIT_LOW,  "main battery temp" },
317         { TOSA_GPIO_BAT0_TH_ON,    GPIOF_OUT_INIT_LOW,  "jacket battery temp" },
318         { TOSA_GPIO_BU_CHRG_ON,    GPIOF_OUT_INIT_LOW,  "backup battery" },
319         { TOSA_GPIO_BAT0_CRG,      GPIOF_IN,            "main battery full" },
320         { TOSA_GPIO_BAT1_CRG,      GPIOF_IN,            "jacket battery full" },
321         { TOSA_GPIO_BAT0_LOW,      GPIOF_IN,            "main battery low" },
322         { TOSA_GPIO_BAT1_LOW,      GPIOF_IN,            "jacket battery low" },
323         { TOSA_GPIO_JACKET_DETECT, GPIOF_IN,            "jacket detect" },
324 };
325 
326 #ifdef CONFIG_PM
327 static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
328 {
329         /* flush all pending status updates */
330         flush_work(&bat_work);
331         return 0;
332 }
333 
334 static int tosa_bat_resume(struct platform_device *dev)
335 {
336         /* things may have changed while we were away */
337         schedule_work(&bat_work);
338         return 0;
339 }
340 #else
341 #define tosa_bat_suspend NULL
342 #define tosa_bat_resume NULL
343 #endif
344 
345 static int tosa_bat_probe(struct platform_device *dev)
346 {
347         int ret;
348 
349         if (!machine_is_tosa())
350                 return -ENODEV;
351 
352         ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
353         if (ret)
354                 return ret;
355 
356         mutex_init(&tosa_bat_main.work_lock);
357         mutex_init(&tosa_bat_jacket.work_lock);
358 
359         INIT_WORK(&bat_work, tosa_bat_work);
360 
361         ret = power_supply_register(&dev->dev, &tosa_bat_main.psy);
362         if (ret)
363                 goto err_psy_reg_main;
364         ret = power_supply_register(&dev->dev, &tosa_bat_jacket.psy);
365         if (ret)
366                 goto err_psy_reg_jacket;
367         ret = power_supply_register(&dev->dev, &tosa_bat_bu.psy);
368         if (ret)
369                 goto err_psy_reg_bu;
370 
371         ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
372                                 tosa_bat_gpio_isr,
373                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
374                                 "main full", &tosa_bat_main);
375         if (ret)
376                 goto err_req_main;
377 
378         ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
379                                 tosa_bat_gpio_isr,
380                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
381                                 "jacket full", &tosa_bat_jacket);
382         if (ret)
383                 goto err_req_jacket;
384 
385         ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
386                                 tosa_bat_gpio_isr,
387                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
388                                 "jacket detect", &tosa_bat_jacket);
389         if (!ret) {
390                 schedule_work(&bat_work);
391                 return 0;
392         }
393 
394         free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
395 err_req_jacket:
396         free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
397 err_req_main:
398         power_supply_unregister(&tosa_bat_bu.psy);
399 err_psy_reg_bu:
400         power_supply_unregister(&tosa_bat_jacket.psy);
401 err_psy_reg_jacket:
402         power_supply_unregister(&tosa_bat_main.psy);
403 err_psy_reg_main:
404 
405         /* see comment in tosa_bat_remove */
406         cancel_work_sync(&bat_work);
407 
408         gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
409         return ret;
410 }
411 
412 static int tosa_bat_remove(struct platform_device *dev)
413 {
414         free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
415         free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
416         free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
417 
418         power_supply_unregister(&tosa_bat_bu.psy);
419         power_supply_unregister(&tosa_bat_jacket.psy);
420         power_supply_unregister(&tosa_bat_main.psy);
421 
422         /*
423          * Now cancel the bat_work.  We won't get any more schedules,
424          * since all sources (isr and external_power_changed) are
425          * unregistered now.
426          */
427         cancel_work_sync(&bat_work);
428         gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
429         return 0;
430 }
431 
432 static struct platform_driver tosa_bat_driver = {
433         .driver.name    = "wm97xx-battery",
434         .driver.owner   = THIS_MODULE,
435         .probe          = tosa_bat_probe,
436         .remove         = tosa_bat_remove,
437         .suspend        = tosa_bat_suspend,
438         .resume         = tosa_bat_resume,
439 };
440 
441 module_platform_driver(tosa_bat_driver);
442 
443 MODULE_LICENSE("GPL");
444 MODULE_AUTHOR("Dmitry Baryshkov");
445 MODULE_DESCRIPTION("Tosa battery driver");
446 MODULE_ALIAS("platform:wm97xx-battery");
447 

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