drivers/power/collie_battery.c

   1 /*
   2  * Battery and Power Management code for the Sharp SL-5x00
   3  *
   4  * Copyright (C) 2009 Thomas Kunze
   5  *
   6  * based on tosa_battery.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/delay.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/gpio.h>
  20 #include <linux/mfd/ucb1x00.h>
  21
  22 #include <asm/mach/sharpsl_param.h>
  23 #include <asm/mach-types.h>
  24 #include <mach/collie.h>
  25
  26 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
  27 static struct work_struct bat_work;
  28 static struct ucb1x00 *ucb;
  29 static int wakeup_enabled;
  30
  31 struct collie_bat {
  32         int status;
  33         struct power_supply psy;
  34         int full_chrg;
  35
  36         struct mutex work_lock; /* protects data */
  37
  38         bool (*is_present)(struct collie_bat *bat);
  39         int gpio_full;
  40         int gpio_charge_on;
  41
  42         int technology;
  43
  44         int gpio_bat;
  45         int adc_bat;
  46         int adc_bat_divider;
  47         int bat_max;
  48         int bat_min;
  49
  50         int gpio_temp;
  51         int adc_temp;
  52         int adc_temp_divider;
  53 };
  54
  55 static struct collie_bat collie_bat_main;
  56
  57 static unsigned long collie_read_bat(struct collie_bat *bat)
  58 {
  59         unsigned long value = 0;
  60
  61         if (bat->gpio_bat < 0 || bat->adc_bat < 0)
  62                 return 0;
  63         mutex_lock(&bat_lock);
  64         gpio_set_value(bat->gpio_bat, 1);
  65         msleep(5);
  66         ucb1x00_adc_enable(ucb);
  67         value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
  68         ucb1x00_adc_disable(ucb);
  69         gpio_set_value(bat->gpio_bat, 0);
  70         mutex_unlock(&bat_lock);
  71         value = value * 1000000 / bat->adc_bat_divider;
  72
  73         return value;
  74 }
  75
  76 static unsigned long collie_read_temp(struct collie_bat *bat)
  77 {
  78         unsigned long value = 0;
  79         if (bat->gpio_temp < 0 || bat->adc_temp < 0)
  80                 return 0;
  81
  82         mutex_lock(&bat_lock);
  83         gpio_set_value(bat->gpio_temp, 1);
  84         msleep(5);
  85         ucb1x00_adc_enable(ucb);
  86         value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
  87         ucb1x00_adc_disable(ucb);
  88         gpio_set_value(bat->gpio_temp, 0);
  89         mutex_unlock(&bat_lock);
  90
  91         value = value * 10000 / bat->adc_temp_divider;
  92
  93         return value;
  94 }
  95
  96 static int collie_bat_get_property(struct power_supply *psy,
  97                             enum power_supply_property psp,
  98                             union power_supply_propval *val)
  99 {
 100         int ret = 0;
 101         struct collie_bat *bat = container_of(psy, struct collie_bat, psy);
 102
 103         if (bat->is_present && !bat->is_present(bat)
 104                         && psp != POWER_SUPPLY_PROP_PRESENT) {
 105                 return -ENODEV;
 106         }
 107
 108         switch (psp) {
 109         case POWER_SUPPLY_PROP_STATUS:
 110                 val->intval = bat->status;
 111                 break;
 112         case POWER_SUPPLY_PROP_TECHNOLOGY:
 113                 val->intval = bat->technology;
 114                 break;
 115         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 116                 val->intval = collie_read_bat(bat);
 117                 break;
 118         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 119                 if (bat->full_chrg == -1)
 120                         val->intval = bat->bat_max;
 121                 else
 122                         val->intval = bat->full_chrg;
 123                 break;
 124         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 125                 val->intval = bat->bat_max;
 126                 break;
 127         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 128                 val->intval = bat->bat_min;
 129                 break;
 130         case POWER_SUPPLY_PROP_TEMP:
 131                 val->intval = collie_read_temp(bat);
 132                 break;
 133         case POWER_SUPPLY_PROP_PRESENT:
 134                 val->intval = bat->is_present ? bat->is_present(bat) : 1;
 135                 break;
 136         default:
 137                 ret = -EINVAL;
 138                 break;
 139         }
 140         return ret;
 141 }
 142
 143 static void collie_bat_external_power_changed(struct power_supply *psy)
 144 {
 145         schedule_work(&bat_work);
 146 }
 147
 148 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
 149 {
 150         pr_info("collie_bat_gpio irq\n");
 151         schedule_work(&bat_work);
 152         return IRQ_HANDLED;
 153 }
 154
 155 static void collie_bat_update(struct collie_bat *bat)
 156 {
 157         int old;
 158         struct power_supply *psy = &bat->psy;
 159
 160         mutex_lock(&bat->work_lock);
 161
 162         old = bat->status;
 163
 164         if (bat->is_present && !bat->is_present(bat)) {
 165                 printk(KERN_NOTICE "%s not present\n", psy->name);
 166                 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 167                 bat->full_chrg = -1;
 168         } else if (power_supply_am_i_supplied(psy)) {
 169                 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
 170                         gpio_set_value(bat->gpio_charge_on, 1);
 171                         mdelay(15);
 172                 }
 173
 174                 if (gpio_get_value(bat->gpio_full)) {
 175                         if (old == POWER_SUPPLY_STATUS_CHARGING ||
 176                                         bat->full_chrg == -1)
 177                                 bat->full_chrg = collie_read_bat(bat);
 178
 179                         gpio_set_value(bat->gpio_charge_on, 0);
 180                         bat->status = POWER_SUPPLY_STATUS_FULL;
 181                 } else {
 182                         gpio_set_value(bat->gpio_charge_on, 1);
 183                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 184                 }
 185         } else {
 186                 gpio_set_value(bat->gpio_charge_on, 0);
 187                 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 188         }
 189
 190         if (old != bat->status)
 191                 power_supply_changed(psy);
 192
 193         mutex_unlock(&bat->work_lock);
 194 }
 195
 196 static void collie_bat_work(struct work_struct *work)
 197 {
 198         collie_bat_update(&collie_bat_main);
 199 }
 200
 201
 202 static enum power_supply_property collie_bat_main_props[] = {
 203         POWER_SUPPLY_PROP_STATUS,
 204         POWER_SUPPLY_PROP_TECHNOLOGY,
 205         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 206         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 207         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 208         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 209         POWER_SUPPLY_PROP_PRESENT,
 210         POWER_SUPPLY_PROP_TEMP,
 211 };
 212
 213 static enum power_supply_property collie_bat_bu_props[] = {
 214         POWER_SUPPLY_PROP_STATUS,
 215         POWER_SUPPLY_PROP_TECHNOLOGY,
 216         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 217         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 218         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 219         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 220         POWER_SUPPLY_PROP_PRESENT,
 221 };
 222
 223 static struct collie_bat collie_bat_main = {
 224         .status = POWER_SUPPLY_STATUS_DISCHARGING,
 225         .full_chrg = -1,
 226         .psy = {
 227                 .name           = "main-battery",
 228                 .type           = POWER_SUPPLY_TYPE_BATTERY,
 229                 .properties     = collie_bat_main_props,
 230                 .num_properties = ARRAY_SIZE(collie_bat_main_props),
 231                 .get_property   = collie_bat_get_property,
 232                 .external_power_changed = collie_bat_external_power_changed,
 233                 .use_for_apm    = 1,
 234         },
 235
 236         .gpio_full = COLLIE_GPIO_CO,
 237         .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
 238
 239         .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
 240
 241         .gpio_bat = COLLIE_GPIO_MBAT_ON,
 242         .adc_bat = UCB_ADC_INP_AD1,
 243         .adc_bat_divider = 155,
 244         .bat_max = 4310000,
 245         .bat_min = 1551 * 1000000 / 414,
 246
 247         .gpio_temp = COLLIE_GPIO_TMP_ON,
 248         .adc_temp = UCB_ADC_INP_AD0,
 249         .adc_temp_divider = 10000,
 250 };
 251
 252 static struct collie_bat collie_bat_bu = {
 253         .status = POWER_SUPPLY_STATUS_UNKNOWN,
 254         .full_chrg = -1,
 255
 256         .psy = {
 257                 .name           = "backup-battery",
 258                 .type           = POWER_SUPPLY_TYPE_BATTERY,
 259                 .properties     = collie_bat_bu_props,
 260                 .num_properties = ARRAY_SIZE(collie_bat_bu_props),
 261                 .get_property   = collie_bat_get_property,
 262                 .external_power_changed = collie_bat_external_power_changed,
 263         },
 264
 265         .gpio_full = -1,
 266         .gpio_charge_on = -1,
 267
 268         .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
 269
 270         .gpio_bat = COLLIE_GPIO_BBAT_ON,
 271         .adc_bat = UCB_ADC_INP_AD1,
 272         .adc_bat_divider = 155,
 273         .bat_max = 3000000,
 274         .bat_min = 1900000,
 275
 276         .gpio_temp = -1,
 277         .adc_temp = -1,
 278         .adc_temp_divider = -1,
 279 };
 280
 281 static struct gpio collie_batt_gpios[] = {
 282         { COLLIE_GPIO_CO,           GPIOF_IN,           "main battery full" },
 283         { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,           "main battery low" },
 284         { COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW, "main charge on" },
 285         { COLLIE_GPIO_MBAT_ON,      GPIOF_OUT_INIT_LOW, "main battery" },
 286         { COLLIE_GPIO_TMP_ON,       GPIOF_OUT_INIT_LOW, "main battery temp" },
 287         { COLLIE_GPIO_BBAT_ON,      GPIOF_OUT_INIT_LOW, "backup battery" },
 288 };
 289
 290 #ifdef CONFIG_PM
 291 static int collie_bat_suspend(struct ucb1x00_dev *dev)
 292 {
 293         /* flush all pending status updates */
 294         flush_work(&bat_work);
 295
 296         if (device_may_wakeup(&dev->ucb->dev) &&
 297             collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
 298                 wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
 299         else
 300                 wakeup_enabled = 0;
 301
 302         return 0;
 303 }
 304
 305 static int collie_bat_resume(struct ucb1x00_dev *dev)
 306 {
 307         if (wakeup_enabled)
 308                 disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
 309
 310         /* things may have changed while we were away */
 311         schedule_work(&bat_work);
 312         return 0;
 313 }
 314 #else
 315 #define collie_bat_suspend NULL
 316 #define collie_bat_resume NULL
 317 #endif
 318
 319 static int collie_bat_probe(struct ucb1x00_dev *dev)
 320 {
 321         int ret;
 322
 323         if (!machine_is_collie())
 324                 return -ENODEV;
 325
 326         ucb = dev->ucb;
 327
 328         ret = gpio_request_array(collie_batt_gpios,
 329                                  ARRAY_SIZE(collie_batt_gpios));
 330         if (ret)
 331                 return ret;
 332
 333         mutex_init(&collie_bat_main.work_lock);
 334
 335         INIT_WORK(&bat_work, collie_bat_work);
 336
 337         ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
 338         if (ret)
 339                 goto err_psy_reg_main;
 340         ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
 341         if (ret)
 342                 goto err_psy_reg_bu;
 343
 344         ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
 345                                 collie_bat_gpio_isr,
 346                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 347                                 "main full", &collie_bat_main);
 348         if (ret)
 349                 goto err_irq;
 350
 351         device_init_wakeup(&ucb->dev, 1);
 352         schedule_work(&bat_work);
 353
 354         return 0;
 355
 356 err_irq:
 357         power_supply_unregister(&collie_bat_bu.psy);
 358 err_psy_reg_bu:
 359         power_supply_unregister(&collie_bat_main.psy);
 360 err_psy_reg_main:
 361
 362         /* see comment in collie_bat_remove */
 363         cancel_work_sync(&bat_work);
 364         gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
 365         return ret;
 366 }
 367
 368 static void collie_bat_remove(struct ucb1x00_dev *dev)
 369 {
 370         free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
 371
 372         power_supply_unregister(&collie_bat_bu.psy);
 373         power_supply_unregister(&collie_bat_main.psy);
 374
 375         /*
 376          * Now cancel the bat_work.  We won't get any more schedules,
 377          * since all sources (isr and external_power_changed) are
 378          * unregistered now.
 379          */
 380         cancel_work_sync(&bat_work);
 381         gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
 382 }
 383
 384 static struct ucb1x00_driver collie_bat_driver = {
 385         .add            = collie_bat_probe,
 386         .remove         = collie_bat_remove,
 387         .suspend        = collie_bat_suspend,
 388         .resume         = collie_bat_resume,
 389 };
 390
 391 static int __init collie_bat_init(void)
 392 {
 393         return ucb1x00_register_driver(&collie_bat_driver);
 394 }
 395
 396 static void __exit collie_bat_exit(void)
 397 {
 398         ucb1x00_unregister_driver(&collie_bat_driver);
 399 }
 400
 401 module_init(collie_bat_init);
 402 module_exit(collie_bat_exit);
 403
 404 MODULE_LICENSE("GPL");
 405 MODULE_AUTHOR("Thomas Kunze");
 406 MODULE_DESCRIPTION("Collie battery driver");