drivers/power/supply/collie_battery.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Battery and Power Management code for the Sharp SL-5x00
   4  *
   5  * Copyright (C) 2009 Thomas Kunze
   6  *
   7  * based on tosa_battery.c
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/power_supply.h>
  12 #include <linux/delay.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/gpio/driver.h>
  16 #include <linux/gpio/machine.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/mfd/ucb1x00.h>
  19
  20 #include <asm/mach/sharpsl_param.h>
  21 #include <asm/mach-types.h>
  22 #include <mach/collie.h>
  23
  24 static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
  25 static struct work_struct bat_work;
  26 static struct ucb1x00 *ucb;
  27
  28 struct collie_bat {
  29         int status;
  30         struct power_supply *psy;
  31         int full_chrg;
  32
  33         struct mutex work_lock; /* protects data */
  34
  35         bool (*is_present)(struct collie_bat *bat);
  36         struct gpio_desc *gpio_full;
  37         struct gpio_desc *gpio_charge_on;
  38
  39         int technology;
  40
  41         struct gpio_desc *gpio_bat;
  42         int adc_bat;
  43         int adc_bat_divider;
  44         int bat_max;
  45         int bat_min;
  46
  47         struct gpio_desc *gpio_temp;
  48         int adc_temp;
  49         int adc_temp_divider;
  50 };
  51
  52 static struct collie_bat collie_bat_main;
  53
  54 static unsigned long collie_read_bat(struct collie_bat *bat)
  55 {
  56         unsigned long value = 0;
  57
  58         if (!bat->gpio_bat || bat->adc_bat < 0)
  59                 return 0;
  60         mutex_lock(&bat_lock);
  61         gpiod_set_value(bat->gpio_bat, 1);
  62         msleep(5);
  63         ucb1x00_adc_enable(ucb);
  64         value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
  65         ucb1x00_adc_disable(ucb);
  66         gpiod_set_value(bat->gpio_bat, 0);
  67         mutex_unlock(&bat_lock);
  68         value = value * 1000000 / bat->adc_bat_divider;
  69
  70         return value;
  71 }
  72
  73 static unsigned long collie_read_temp(struct collie_bat *bat)
  74 {
  75         unsigned long value = 0;
  76         if (!bat->gpio_temp || bat->adc_temp < 0)
  77                 return 0;
  78
  79         mutex_lock(&bat_lock);
  80         gpiod_set_value(bat->gpio_temp, 1);
  81         msleep(5);
  82         ucb1x00_adc_enable(ucb);
  83         value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
  84         ucb1x00_adc_disable(ucb);
  85         gpiod_set_value(bat->gpio_temp, 0);
  86         mutex_unlock(&bat_lock);
  87
  88         value = value * 10000 / bat->adc_temp_divider;
  89
  90         return value;
  91 }
  92
  93 static int collie_bat_get_property(struct power_supply *psy,
  94                             enum power_supply_property psp,
  95                             union power_supply_propval *val)
  96 {
  97         int ret = 0;
  98         struct collie_bat *bat = power_supply_get_drvdata(psy);
  99
 100         if (bat->is_present && !bat->is_present(bat)
 101                         && psp != POWER_SUPPLY_PROP_PRESENT) {
 102                 return -ENODEV;
 103         }
 104
 105         switch (psp) {
 106         case POWER_SUPPLY_PROP_STATUS:
 107                 val->intval = bat->status;
 108                 break;
 109         case POWER_SUPPLY_PROP_TECHNOLOGY:
 110                 val->intval = bat->technology;
 111                 break;
 112         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 113                 val->intval = collie_read_bat(bat);
 114                 break;
 115         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 116                 if (bat->full_chrg == -1)
 117                         val->intval = bat->bat_max;
 118                 else
 119                         val->intval = bat->full_chrg;
 120                 break;
 121         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 122                 val->intval = bat->bat_max;
 123                 break;
 124         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 125                 val->intval = bat->bat_min;
 126                 break;
 127         case POWER_SUPPLY_PROP_TEMP:
 128                 val->intval = collie_read_temp(bat);
 129                 break;
 130         case POWER_SUPPLY_PROP_PRESENT:
 131                 val->intval = bat->is_present ? bat->is_present(bat) : 1;
 132                 break;
 133         default:
 134                 ret = -EINVAL;
 135                 break;
 136         }
 137         return ret;
 138 }
 139
 140 static void collie_bat_external_power_changed(struct power_supply *psy)
 141 {
 142         schedule_work(&bat_work);
 143 }
 144
 145 static irqreturn_t collie_bat_gpio_isr(int irq, void *data)
 146 {
 147         pr_info("collie_bat_gpio irq\n");
 148         schedule_work(&bat_work);
 149         return IRQ_HANDLED;
 150 }
 151
 152 static void collie_bat_update(struct collie_bat *bat)
 153 {
 154         int old;
 155         struct power_supply *psy = bat->psy;
 156
 157         mutex_lock(&bat->work_lock);
 158
 159         old = bat->status;
 160
 161         if (bat->is_present && !bat->is_present(bat)) {
 162                 printk(KERN_NOTICE "%s not present\n", psy->desc->name);
 163                 bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
 164                 bat->full_chrg = -1;
 165         } else if (power_supply_am_i_supplied(psy)) {
 166                 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
 167                         gpiod_set_value(bat->gpio_charge_on, 1);
 168                         mdelay(15);
 169                 }
 170
 171                 if (gpiod_get_value(bat->gpio_full)) {
 172                         if (old == POWER_SUPPLY_STATUS_CHARGING ||
 173                                         bat->full_chrg == -1)
 174                                 bat->full_chrg = collie_read_bat(bat);
 175
 176                         gpiod_set_value(bat->gpio_charge_on, 0);
 177                         bat->status = POWER_SUPPLY_STATUS_FULL;
 178                 } else {
 179                         gpiod_set_value(bat->gpio_charge_on, 1);
 180                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 181                 }
 182         } else {
 183                 gpiod_set_value(bat->gpio_charge_on, 0);
 184                 bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 185         }
 186
 187         if (old != bat->status)
 188                 power_supply_changed(psy);
 189
 190         mutex_unlock(&bat->work_lock);
 191 }
 192
 193 static void collie_bat_work(struct work_struct *work)
 194 {
 195         collie_bat_update(&collie_bat_main);
 196 }
 197
 198
 199 static enum power_supply_property collie_bat_main_props[] = {
 200         POWER_SUPPLY_PROP_STATUS,
 201         POWER_SUPPLY_PROP_TECHNOLOGY,
 202         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 203         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 204         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 205         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 206         POWER_SUPPLY_PROP_PRESENT,
 207         POWER_SUPPLY_PROP_TEMP,
 208 };
 209
 210 static enum power_supply_property collie_bat_bu_props[] = {
 211         POWER_SUPPLY_PROP_STATUS,
 212         POWER_SUPPLY_PROP_TECHNOLOGY,
 213         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 214         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 215         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 216         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 217         POWER_SUPPLY_PROP_PRESENT,
 218 };
 219
 220 static const struct power_supply_desc collie_bat_main_desc = {
 221         .name           = "main-battery",
 222         .type           = POWER_SUPPLY_TYPE_BATTERY,
 223         .properties     = collie_bat_main_props,
 224         .num_properties = ARRAY_SIZE(collie_bat_main_props),
 225         .get_property   = collie_bat_get_property,
 226         .external_power_changed = collie_bat_external_power_changed,
 227         .use_for_apm    = 1,
 228 };
 229
 230 static struct collie_bat collie_bat_main = {
 231         .status = POWER_SUPPLY_STATUS_DISCHARGING,
 232         .full_chrg = -1,
 233         .psy = NULL,
 234
 235         .gpio_full = NULL,
 236         .gpio_charge_on = NULL,
 237
 238         .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
 239
 240         .gpio_bat = NULL,
 241         .adc_bat = UCB_ADC_INP_AD1,
 242         .adc_bat_divider = 155,
 243         .bat_max = 4310000,
 244         .bat_min = 1551 * 1000000 / 414,
 245
 246         .gpio_temp = NULL,
 247         .adc_temp = UCB_ADC_INP_AD0,
 248         .adc_temp_divider = 10000,
 249 };
 250
 251 static const struct power_supply_desc collie_bat_bu_desc = {
 252         .name           = "backup-battery",
 253         .type           = POWER_SUPPLY_TYPE_BATTERY,
 254         .properties     = collie_bat_bu_props,
 255         .num_properties = ARRAY_SIZE(collie_bat_bu_props),
 256         .get_property   = collie_bat_get_property,
 257         .external_power_changed = collie_bat_external_power_changed,
 258 };
 259
 260 static struct collie_bat collie_bat_bu = {
 261         .status = POWER_SUPPLY_STATUS_UNKNOWN,
 262         .full_chrg = -1,
 263         .psy = NULL,
 264
 265         .gpio_full = NULL,
 266         .gpio_charge_on = NULL,
 267
 268         .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
 269
 270         .gpio_bat = NULL,
 271         .adc_bat = UCB_ADC_INP_AD1,
 272         .adc_bat_divider = 155,
 273         .bat_max = 3000000,
 274         .bat_min = 1900000,
 275
 276         .gpio_temp = NULL,
 277         .adc_temp = -1,
 278         .adc_temp_divider = -1,
 279 };
 280
 281 /* Obtained but unused GPIO */
 282 static struct gpio_desc *collie_mbat_low;
 283
 284 #ifdef CONFIG_PM
 285 static int wakeup_enabled;
 286
 287 static int collie_bat_suspend(struct ucb1x00_dev *dev)
 288 {
 289         /* flush all pending status updates */
 290         flush_work(&bat_work);
 291
 292         if (device_may_wakeup(&dev->ucb->dev) &&
 293             collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
 294                 wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
 295         else
 296                 wakeup_enabled = 0;
 297
 298         return 0;
 299 }
 300
 301 static int collie_bat_resume(struct ucb1x00_dev *dev)
 302 {
 303         if (wakeup_enabled)
 304                 disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
 305
 306         /* things may have changed while we were away */
 307         schedule_work(&bat_work);
 308         return 0;
 309 }
 310 #else
 311 #define collie_bat_suspend NULL
 312 #define collie_bat_resume NULL
 313 #endif
 314
 315 static int collie_bat_probe(struct ucb1x00_dev *dev)
 316 {
 317         int ret;
 318         struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
 319         struct gpio_chip *gc = &dev->ucb->gpio;
 320
 321         if (!machine_is_collie())
 322                 return -ENODEV;
 323
 324         ucb = dev->ucb;
 325
 326         /* Obtain all the main battery GPIOs */
 327         collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
 328                                               "main battery full",
 329                                               GPIOD_IN);
 330         if (IS_ERR(collie_bat_main.gpio_full))
 331                 return PTR_ERR(collie_bat_main.gpio_full);
 332
 333         collie_mbat_low = gpiod_get(&dev->ucb->dev,
 334                                     "main battery low",
 335                                     GPIOD_IN);
 336         if (IS_ERR(collie_mbat_low)) {
 337                 ret = PTR_ERR(collie_mbat_low);
 338                 goto err_put_gpio_full;
 339         }
 340
 341         collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
 342                                                    "main charge on",
 343                                                    GPIOD_OUT_LOW);
 344         if (IS_ERR(collie_bat_main.gpio_charge_on)) {
 345                 ret = PTR_ERR(collie_bat_main.gpio_charge_on);
 346                 goto err_put_mbat_low;
 347         }
 348
 349         /* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
 350         collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
 351                                                 7,
 352                                                 "main battery",
 353                                                 GPIO_ACTIVE_HIGH,
 354                                                 GPIOD_OUT_LOW);
 355         if (IS_ERR(collie_bat_main.gpio_bat)) {
 356                 ret = PTR_ERR(collie_bat_main.gpio_bat);
 357                 goto err_put_gpio_charge_on;
 358         }
 359
 360         /* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
 361         collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
 362                                                 9,
 363                                                 "main battery temp",
 364                                                 GPIO_ACTIVE_HIGH,
 365                                                 GPIOD_OUT_LOW);
 366         if (IS_ERR(collie_bat_main.gpio_temp)) {
 367                 ret = PTR_ERR(collie_bat_main.gpio_temp);
 368                 goto err_free_gpio_bat;
 369         }
 370
 371         /*
 372          * Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
 373          * GPIO 8 on the UCB (TC35143)
 374          */
 375         collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
 376                                                 8,
 377                                                 "backup battery",
 378                                                 GPIO_ACTIVE_HIGH,
 379                                                 GPIOD_OUT_LOW);
 380         if (IS_ERR(collie_bat_bu.gpio_bat)) {
 381                 ret = PTR_ERR(collie_bat_bu.gpio_bat);
 382                 goto err_free_gpio_temp;
 383         }
 384
 385         mutex_init(&collie_bat_main.work_lock);
 386
 387         INIT_WORK(&bat_work, collie_bat_work);
 388
 389         psy_main_cfg.drv_data = &collie_bat_main;
 390         collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
 391                                                     &collie_bat_main_desc,
 392                                                     &psy_main_cfg);
 393         if (IS_ERR(collie_bat_main.psy)) {
 394                 ret = PTR_ERR(collie_bat_main.psy);
 395                 goto err_psy_reg_main;
 396         }
 397
 398         psy_bu_cfg.drv_data = &collie_bat_bu;
 399         collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
 400                                                   &collie_bat_bu_desc,
 401                                                   &psy_bu_cfg);
 402         if (IS_ERR(collie_bat_bu.psy)) {
 403                 ret = PTR_ERR(collie_bat_bu.psy);
 404                 goto err_psy_reg_bu;
 405         }
 406
 407         ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
 408                                 collie_bat_gpio_isr,
 409                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 410                                 "main full", &collie_bat_main);
 411         if (ret)
 412                 goto err_irq;
 413
 414         device_init_wakeup(&ucb->dev, 1);
 415         schedule_work(&bat_work);
 416
 417         return 0;
 418
 419 err_irq:
 420         power_supply_unregister(collie_bat_bu.psy);
 421 err_psy_reg_bu:
 422         power_supply_unregister(collie_bat_main.psy);
 423 err_psy_reg_main:
 424         /* see comment in collie_bat_remove */
 425         cancel_work_sync(&bat_work);
 426         gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
 427 err_free_gpio_temp:
 428         gpiochip_free_own_desc(collie_bat_main.gpio_temp);
 429 err_free_gpio_bat:
 430         gpiochip_free_own_desc(collie_bat_main.gpio_bat);
 431 err_put_gpio_charge_on:
 432         gpiod_put(collie_bat_main.gpio_charge_on);
 433 err_put_mbat_low:
 434         gpiod_put(collie_mbat_low);
 435 err_put_gpio_full:
 436         gpiod_put(collie_bat_main.gpio_full);
 437
 438         return ret;
 439 }
 440
 441 static void collie_bat_remove(struct ucb1x00_dev *dev)
 442 {
 443         free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
 444         power_supply_unregister(collie_bat_bu.psy);
 445         power_supply_unregister(collie_bat_main.psy);
 446
 447         /* These are obtained from the machine */
 448         gpiod_put(collie_bat_main.gpio_full);
 449         gpiod_put(collie_mbat_low);
 450         gpiod_put(collie_bat_main.gpio_charge_on);
 451         /* These are directly from the UCB so let's free them */
 452         gpiochip_free_own_desc(collie_bat_main.gpio_bat);
 453         gpiochip_free_own_desc(collie_bat_main.gpio_temp);
 454         gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
 455         /*
 456          * Now cancel the bat_work.  We won't get any more schedules,
 457          * since all sources (isr and external_power_changed) are
 458          * unregistered now.
 459          */
 460         cancel_work_sync(&bat_work);
 461 }
 462
 463 static struct ucb1x00_driver collie_bat_driver = {
 464         .add            = collie_bat_probe,
 465         .remove         = collie_bat_remove,
 466         .suspend        = collie_bat_suspend,
 467         .resume         = collie_bat_resume,
 468 };
 469
 470 static int __init collie_bat_init(void)
 471 {
 472         return ucb1x00_register_driver(&collie_bat_driver);
 473 }
 474
 475 static void __exit collie_bat_exit(void)
 476 {
 477         ucb1x00_unregister_driver(&collie_bat_driver);
 478 }
 479
 480 module_init(collie_bat_init);
 481 module_exit(collie_bat_exit);
 482
 483 MODULE_LICENSE("GPL");
 484 MODULE_AUTHOR("Thomas Kunze");
 485 MODULE_DESCRIPTION("Collie battery driver");