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(bat->psy.dev->parent->driver_data,
  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(bat->psy.dev->parent->driver_data,
  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: %d\n", gpio_get_value(irq_to_gpio(irq)));
 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 {
 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
 332 static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
 333 {
 334         /* flush all pending status updates */
 335         flush_scheduled_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 __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         flush_scheduled_work();
 426
 427         i--;
 428 err_gpio:
 429         for (; i >= 0; i--)
 430                 gpio_free(gpios[i].gpio);
 431
 432         return ret;
 433 }
 434
 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 flush all pending work.
 449          * we won't get any more schedules, since all
 450          * sources (isr and external_power_changed)
 451          * are unregistered now.
 452          */
 453         flush_scheduled_work();
 454
 455         for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
 456                 gpio_free(gpios[i].gpio);
 457
 458         return 0;
 459 }
 460
 461 static struct platform_driver tosa_bat_driver = {
 462         .driver.name    = "wm97xx-battery",
 463         .driver.owner   = THIS_MODULE,
 464         .probe          = tosa_bat_probe,
 465         .remove         = __devexit_p(tosa_bat_remove),
 466         .suspend        = tosa_bat_suspend,
 467         .resume         = tosa_bat_resume,
 468 };
 469
 470 static int __init tosa_bat_init(void)
 471 {
 472         return platform_driver_register(&tosa_bat_driver);
 473 }
 474
 475 static void __exit tosa_bat_exit(void)
 476 {
 477         platform_driver_unregister(&tosa_bat_driver);
 478 }
 479
 480 module_init(tosa_bat_init);
 481 module_exit(tosa_bat_exit);
 482
 483 MODULE_LICENSE("GPL");
 484 MODULE_AUTHOR("Dmitry Baryshkov");
 485 MODULE_DESCRIPTION("Tosa battery driver");
 486 MODULE_ALIAS("platform:wm97xx-battery");