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
  30 struct collie_bat {
  31         int status;
  32         struct power_supply *psy;
  33         int full_chrg;
  34
  35         struct mutex work_lock; /* protects data */
  36
  37         bool (*is_present)(struct collie_bat *bat);
  38         int gpio_full;
  39         int gpio_charge_on;
  40
  41         int technology;
  42
  43         int gpio_bat;
  44         int adc_bat;
  45         int adc_bat_divider;
  46         int bat_max;
  47         int bat_min;
  48
  49         int gpio_temp;
  50         int adc_temp;
  51         int adc_temp_divider;
  52 };
  53
  54 static struct collie_bat collie_bat_main;
  55
  56 static unsigned long collie_read_bat(struct collie_bat *bat)
  57 {
  58         unsigned long value = 0;
  59
  60         if (bat->gpio_bat < 0 || bat->adc_bat < 0)
  61                 return 0;
  62         mutex_lock(&bat_lock);
  63         gpio_set_value(bat->gpio_bat, 1);
  64         msleep(5);
  65         ucb1x00_adc_enable(ucb);
  66         value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
  67         ucb1x00_adc_disable(ucb);
  68         gpio_set_value(bat->gpio_bat, 0);
  69         mutex_unlock(&bat_lock);
  70         value = value * 1000000 / bat->adc_bat_divider;
  71
  72         return value;
  73 }
  74
  75 static unsigned long collie_read_temp(struct collie_bat *bat)
  76 {
  77         unsigned long value = 0;
  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         ucb1x00_adc_enable(ucb);
  85         value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
  86         ucb1x00_adc_disable(ucb);
  87         gpio_set_value(bat->gpio_temp, 0);
  88         mutex_unlock(&bat_lock);
  89
  90         value = value * 10000 / bat->adc_temp_divider;
  91
  92         return value;
  93 }
  94
  95 static int collie_bat_get_property(struct power_supply *psy,
  96                             enum power_supply_property psp,
  97                             union power_supply_propval *val)
  98 {
  99         int ret = 0;
 100         struct collie_bat *bat = power_supply_get_drvdata(psy);
 101
 102         if (bat->is_present && !bat->is_present(bat)
 103                         && psp != POWER_SUPPLY_PROP_PRESENT) {
 104                 return -ENODEV;
 105         }
 106
 107         switch (psp) {
 108         case POWER_SUPPLY_PROP_STATUS:
 109                 val->intval = bat->status;
 110                 break;
 111         case POWER_SUPPLY_PROP_TECHNOLOGY:
 112                 val->intval = bat->technology;
 113                 break;
 114         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 115                 val->intval = collie_read_bat(bat);
 116                 break;
 117         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 118                 if (bat->full_chrg == -1)
 119                         val->intval = bat->bat_max;
 120                 else
 121                         val->intval = bat->full_chrg;
 122                 break;
 123         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 124                 val->intval = bat->bat_max;
 125                 break;
 126         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 127                 val->intval = bat->bat_min;
 128                 break;
 129         case POWER_SUPPLY_PROP_TEMP:
 130                 val->intval = collie_read_temp(bat);
 131                 break;
 132         case POWER_SUPPLY_PROP_PRESENT:
 133                 val->intval = bat->is_present ? bat->is_present(bat) : 1;
 134                 break;
 135         default:
 136                 ret = -EINVAL;
 137                 break;
 138         }
 139         return ret;
 140 }
 141
 142 static void collie_bat_external_power_changed(struct power_supply *psy)
 143 {
 144         schedule_work(&bat_work);
 145 }
 146
 147 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
 148 {
 149         pr_info("collie_bat_gpio irq\n");
 150         schedule_work(&bat_work);
 151         return IRQ_HANDLED;
 152 }
 153
 154 static void collie_bat_update(struct collie_bat *bat)
 155 {
 156         int old;
 157         struct power_supply *psy = bat->psy;
 158
 159         mutex_lock(&bat->work_lock);
 160
 161         old = bat->status;
 162
 163         if (bat->is_present && !bat->is_present(bat)) {
 164                 printk(KERN_NOTICE "%s not present\n", psy->desc->name);
 165                 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 166                 bat->full_chrg = -1;
 167         } else if (power_supply_am_i_supplied(psy)) {
 168                 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
 169                         gpio_set_value(bat->gpio_charge_on, 1);
 170                         mdelay(15);
 171                 }
 172
 173                 if (gpio_get_value(bat->gpio_full)) {
 174                         if (old == POWER_SUPPLY_STATUS_CHARGING ||
 175                                         bat->full_chrg == -1)
 176                                 bat->full_chrg = collie_read_bat(bat);
 177
 178                         gpio_set_value(bat->gpio_charge_on, 0);
 179                         bat->status = POWER_SUPPLY_STATUS_FULL;
 180                 } else {
 181                         gpio_set_value(bat->gpio_charge_on, 1);
 182                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 183                 }
 184         } else {
 185                 gpio_set_value(bat->gpio_charge_on, 0);
 186                 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 187         }
 188
 189         if (old != bat->status)
 190                 power_supply_changed(psy);
 191
 192         mutex_unlock(&bat->work_lock);
 193 }
 194
 195 static void collie_bat_work(struct work_struct *work)
 196 {
 197         collie_bat_update(&collie_bat_main);
 198 }
 199
 200
 201 static enum power_supply_property collie_bat_main_props[] = {
 202         POWER_SUPPLY_PROP_STATUS,
 203         POWER_SUPPLY_PROP_TECHNOLOGY,
 204         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 205         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 206         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 207         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 208         POWER_SUPPLY_PROP_PRESENT,
 209         POWER_SUPPLY_PROP_TEMP,
 210 };
 211
 212 static enum power_supply_property collie_bat_bu_props[] = {
 213         POWER_SUPPLY_PROP_STATUS,
 214         POWER_SUPPLY_PROP_TECHNOLOGY,
 215         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 216         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 217         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 218         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 219         POWER_SUPPLY_PROP_PRESENT,
 220 };
 221
 222 static const struct power_supply_desc collie_bat_main_desc = {
 223         .name           = "main-battery",
 224         .type           = POWER_SUPPLY_TYPE_BATTERY,
 225         .properties     = collie_bat_main_props,
 226         .num_properties = ARRAY_SIZE(collie_bat_main_props),
 227         .get_property   = collie_bat_get_property,
 228         .external_power_changed = collie_bat_external_power_changed,
 229         .use_for_apm    = 1,
 230 };
 231
 232 static struct collie_bat collie_bat_main = {
 233         .status = POWER_SUPPLY_STATUS_DISCHARGING,
 234         .full_chrg = -1,
 235         .psy = NULL,
 236
 237         .gpio_full = COLLIE_GPIO_CO,
 238         .gpio_charge_on = COLLIE_GPIO_CHARGE_ON,
 239
 240         .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
 241
 242         .gpio_bat = COLLIE_GPIO_MBAT_ON,
 243         .adc_bat = UCB_ADC_INP_AD1,
 244         .adc_bat_divider = 155,
 245         .bat_max = 4310000,
 246         .bat_min = 1551 * 1000000 / 414,
 247
 248         .gpio_temp = COLLIE_GPIO_TMP_ON,
 249         .adc_temp = UCB_ADC_INP_AD0,
 250         .adc_temp_divider = 10000,
 251 };
 252
 253 static const struct power_supply_desc collie_bat_bu_desc = {
 254         .name           = "backup-battery",
 255         .type           = POWER_SUPPLY_TYPE_BATTERY,
 256         .properties     = collie_bat_bu_props,
 257         .num_properties = ARRAY_SIZE(collie_bat_bu_props),
 258         .get_property   = collie_bat_get_property,
 259         .external_power_changed = collie_bat_external_power_changed,
 260 };
 261
 262 static struct collie_bat collie_bat_bu = {
 263         .status = POWER_SUPPLY_STATUS_UNKNOWN,
 264         .full_chrg = -1,
 265         .psy = NULL,
 266
 267         .gpio_full = -1,
 268         .gpio_charge_on = -1,
 269
 270         .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
 271
 272         .gpio_bat = COLLIE_GPIO_BBAT_ON,
 273         .adc_bat = UCB_ADC_INP_AD1,
 274         .adc_bat_divider = 155,
 275         .bat_max = 3000000,
 276         .bat_min = 1900000,
 277
 278         .gpio_temp = -1,
 279         .adc_temp = -1,
 280         .adc_temp_divider = -1,
 281 };
 282
 283 static struct gpio collie_batt_gpios[] = {
 284         { COLLIE_GPIO_CO,           GPIOF_IN,           "main battery full" },
 285         { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN,           "main battery low" },
 286         { COLLIE_GPIO_CHARGE_ON,    GPIOF_OUT_INIT_LOW, "main charge on" },
 287         { COLLIE_GPIO_MBAT_ON,      GPIOF_OUT_INIT_LOW, "main battery" },
 288         { COLLIE_GPIO_TMP_ON,       GPIOF_OUT_INIT_LOW, "main battery temp" },
 289         { COLLIE_GPIO_BBAT_ON,      GPIOF_OUT_INIT_LOW, "backup battery" },
 290 };
 291
 292 #ifdef CONFIG_PM
 293 static int wakeup_enabled;
 294
 295 static int collie_bat_suspend(struct ucb1x00_dev *dev)
 296 {
 297         /* flush all pending status updates */
 298         flush_work(&bat_work);
 299
 300         if (device_may_wakeup(&dev->ucb->dev) &&
 301             collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
 302                 wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
 303         else
 304                 wakeup_enabled = 0;
 305
 306         return 0;
 307 }
 308
 309 static int collie_bat_resume(struct ucb1x00_dev *dev)
 310 {
 311         if (wakeup_enabled)
 312                 disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO));
 313
 314         /* things may have changed while we were away */
 315         schedule_work(&bat_work);
 316         return 0;
 317 }
 318 #else
 319 #define collie_bat_suspend NULL
 320 #define collie_bat_resume NULL
 321 #endif
 322
 323 static int collie_bat_probe(struct ucb1x00_dev *dev)
 324 {
 325         int ret;
 326         struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
 327
 328         if (!machine_is_collie())
 329                 return -ENODEV;
 330
 331         ucb = dev->ucb;
 332
 333         ret = gpio_request_array(collie_batt_gpios,
 334                                  ARRAY_SIZE(collie_batt_gpios));
 335         if (ret)
 336                 return ret;
 337
 338         mutex_init(&collie_bat_main.work_lock);
 339
 340         INIT_WORK(&bat_work, collie_bat_work);
 341
 342         psy_main_cfg.drv_data = &collie_bat_main;
 343         collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
 344                                                     &collie_bat_main_desc,
 345                                                     &psy_main_cfg);
 346         if (IS_ERR(collie_bat_main.psy)) {
 347                 ret = PTR_ERR(collie_bat_main.psy);
 348                 goto err_psy_reg_main;
 349         }
 350
 351         psy_bu_cfg.drv_data = &collie_bat_bu;
 352         collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
 353                                                   &collie_bat_bu_desc,
 354                                                   &psy_bu_cfg);
 355         if (IS_ERR(collie_bat_bu.psy)) {
 356                 ret = PTR_ERR(collie_bat_bu.psy);
 357                 goto err_psy_reg_bu;
 358         }
 359
 360         ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
 361                                 collie_bat_gpio_isr,
 362                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 363                                 "main full", &collie_bat_main);
 364         if (ret)
 365                 goto err_irq;
 366
 367         device_init_wakeup(&ucb->dev, 1);
 368         schedule_work(&bat_work);
 369
 370         return 0;
 371
 372 err_irq:
 373         power_supply_unregister(collie_bat_bu.psy);
 374 err_psy_reg_bu:
 375         power_supply_unregister(collie_bat_main.psy);
 376 err_psy_reg_main:
 377
 378         /* see comment in collie_bat_remove */
 379         cancel_work_sync(&bat_work);
 380         gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
 381         return ret;
 382 }
 383
 384 static void collie_bat_remove(struct ucb1x00_dev *dev)
 385 {
 386         free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
 387
 388         power_supply_unregister(collie_bat_bu.psy);
 389         power_supply_unregister(collie_bat_main.psy);
 390
 391         /*
 392          * Now cancel the bat_work.  We won't get any more schedules,
 393          * since all sources (isr and external_power_changed) are
 394          * unregistered now.
 395          */
 396         cancel_work_sync(&bat_work);
 397         gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios));
 398 }
 399
 400 static struct ucb1x00_driver collie_bat_driver = {
 401         .add            = collie_bat_probe,
 402         .remove         = collie_bat_remove,
 403         .suspend        = collie_bat_suspend,
 404         .resume         = collie_bat_resume,
 405 };
 406
 407 static int __init collie_bat_init(void)
 408 {
 409         return ucb1x00_register_driver(&collie_bat_driver);
 410 }
 411
 412 static void __exit collie_bat_exit(void)
 413 {
 414         ucb1x00_unregister_driver(&collie_bat_driver);
 415 }
 416
 417 module_init(collie_bat_init);
 418 module_exit(collie_bat_exit);
 419
 420 MODULE_LICENSE("GPL");
 421 MODULE_AUTHOR("Thomas Kunze");
 422 MODULE_DESCRIPTION("Collie battery driver");