target/linux/xburst/files-2.6.32/drivers/power/jz4740-battery.c

   1 /*
   2  * Battery measurement code for Ingenic JZ SOC.
   3  *
   4  * based on tosa_battery.c
   5  *
   6  * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
   7  * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  */
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/power_supply.h>
  17 #include <linux/delay.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/gpio.h>
  22
  23 #include <linux/power/jz4740-battery.h>
  24 #include <linux/jz4740-adc.h>
  25
  26 struct jz_battery_info {
  27         struct power_supply bat;
  28         int bat_status;
  29         struct jz_batt_info *pdata;
  30         struct mutex work_lock;
  31         struct workqueue_struct *monitor_wqueue;
  32         struct delayed_work bat_work;
  33 };
  34
  35 #define ps_to_jz_battery(x) container_of((x), struct jz_battery_info, bat);
  36
  37 /*********************************************************************
  38  *              Battery properties
  39  *********************************************************************/
  40
  41 static long jz_read_bat(struct power_supply *psy)
  42 {
  43         struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
  44         enum jz_adc_battery_scale scale;
  45
  46         if (bat_info->pdata->max_voltag > 2500000)
  47                 scale = JZ_ADC_BATTERY_SCALE_7V5;
  48         else
  49                 scale = JZ_ADC_BATTERY_SCALE_2V5;
  50
  51         return jz4740_adc_read_battery_voltage(psy->dev->parent->parent, scale);
  52 }
  53
  54 static int jz_bat_get_capacity(struct power_supply *psy)
  55 {
  56         int ret;
  57         struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
  58
  59         ret = jz_read_bat(psy);
  60
  61         if (ret < 0)
  62                 return ret;
  63
  64         ret = (ret - bat_info->pdata->min_voltag) * 100
  65                 / (bat_info->pdata->max_voltag - bat_info->pdata->min_voltag);
  66
  67         if (ret > 100)
  68                 ret = 100;
  69         else if (ret < 0)
  70                 ret = 0;
  71
  72         return ret;
  73 }
  74
  75 static int jz_bat_get_property(struct power_supply *psy,
  76                                 enum power_supply_property psp,
  77                                 union power_supply_propval *val)
  78 {
  79         struct jz_battery_info *bat_info = ps_to_jz_battery(psy)
  80
  81         switch (psp) {
  82         case POWER_SUPPLY_PROP_STATUS:
  83                 val->intval = bat_info->bat_status;
  84                 break;
  85         case POWER_SUPPLY_PROP_TECHNOLOGY:
  86                 val->intval = bat_info->pdata->batt_tech;
  87                 break;
  88         case POWER_SUPPLY_PROP_HEALTH:
  89                 if(jz_read_bat(psy) < bat_info->pdata->min_voltag) {
  90                         dev_dbg(psy->dev, "%s: battery is dead,"
  91                                 "voltage too low!\n", __func__);
  92                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
  93                 } else {
  94                         dev_dbg(psy->dev, "%s: battery is good,"
  95                                 "voltage normal.\n", __func__);
  96                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
  97                 }
  98                 break;
  99         case POWER_SUPPLY_PROP_CAPACITY:
 100                 val->intval = jz_bat_get_capacity(psy);
 101                 dev_dbg(psy->dev, "%s: battery_capacity = %d\n",
 102                         __func__, val->intval);
 103                 break;
 104         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 105                 val->intval = jz_read_bat(psy);
 106                 if (val->intval < 0)
 107                         return val->intval;
 108                 break;
 109         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 110         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 111                 val->intval = bat_info->pdata->max_voltag;
 112                 break;
 113         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 114                 val->intval = bat_info->pdata->min_voltag;
 115                 break;
 116         case POWER_SUPPLY_PROP_PRESENT:
 117                 val->intval = 1;
 118                 break;
 119         default:
 120                 return -EINVAL;
 121         }
 122         return 0;
 123 }
 124
 125 static void jz_bat_external_power_changed(struct power_supply *psy)
 126 {
 127         struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
 128
 129         cancel_delayed_work(&bat_info->bat_work);
 130         queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ / 8);
 131 }
 132
 133 static char *status_text[] = {
 134         [POWER_SUPPLY_STATUS_UNKNOWN] =         "Unknown",
 135         [POWER_SUPPLY_STATUS_CHARGING] =        "Charging",
 136         [POWER_SUPPLY_STATUS_DISCHARGING] =     "Discharging",
 137         [POWER_SUPPLY_STATUS_NOT_CHARGING] =    "Not charging",
 138 };
 139
 140 static void jz_bat_update(struct power_supply *psy)
 141 {
 142         struct jz_battery_info *bat_info = ps_to_jz_battery(psy);
 143
 144         int old_status = bat_info->bat_status;
 145         static unsigned long old_batt_vol = 0;
 146         unsigned long batt_vol = jz_read_bat(psy);
 147
 148         mutex_lock(&bat_info->work_lock);
 149
 150         if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
 151                 if(!gpio_get_value(bat_info->pdata->charg_stat_gpio))
 152                         bat_info->bat_status = POWER_SUPPLY_STATUS_CHARGING;
 153                 else
 154                         bat_info->bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 155                 dev_dbg(psy->dev, "%s: battery status=%s\n",
 156                         __func__, status_text[bat_info->bat_status]);
 157
 158                 if (old_status != bat_info->bat_status) {
 159                         dev_dbg(psy->dev, "%s %s -> %s\n",
 160                                 psy->name,
 161                                 status_text[old_status],
 162                                 status_text[bat_info->bat_status]);
 163
 164                         power_supply_changed(psy);
 165                 }
 166         }
 167
 168         if (old_batt_vol - batt_vol > 50000) {
 169                 dev_dbg(psy->dev, "voltage change : %ld -> %ld\n",
 170                         old_batt_vol, batt_vol);
 171                 power_supply_changed(psy);
 172                 old_batt_vol = batt_vol;
 173         }
 174
 175         mutex_unlock(&bat_info->work_lock);
 176 }
 177
 178 static enum power_supply_property jz_bat_main_props[] = {
 179         POWER_SUPPLY_PROP_STATUS,
 180         POWER_SUPPLY_PROP_TECHNOLOGY,
 181         POWER_SUPPLY_PROP_HEALTH,
 182         POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
 183         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 184         POWER_SUPPLY_PROP_VOLTAGE_MAX,
 185         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 186         POWER_SUPPLY_PROP_PRESENT,
 187 };
 188
 189 struct power_supply bat_ps = {
 190         .name                   = "battery",
 191         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 192         .properties             = jz_bat_main_props,
 193         .num_properties         = ARRAY_SIZE(jz_bat_main_props),
 194         .get_property           = jz_bat_get_property,
 195         .external_power_changed = jz_bat_external_power_changed,
 196         .use_for_apm            = 1,
 197 };
 198
 199 static void jz_bat_work(struct work_struct *work)
 200 {
 201         /* query interval too small will increase system workload*/
 202         const int interval = HZ * 30;
 203         struct jz_battery_info *bat_info = container_of(work,struct jz_battery_info, bat_work.work);
 204
 205         jz_bat_update(&bat_info->bat);
 206         queue_delayed_work(bat_info->monitor_wqueue,
 207                            &bat_info->bat_work, interval);
 208 }
 209
 210 #ifdef CONFIG_PM
 211 static int jz_bat_suspend(struct platform_device *pdev, pm_message_t state)
 212 {
 213         struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
 214
 215         bat_info->bat_status =  POWER_SUPPLY_STATUS_UNKNOWN;
 216
 217         return 0;
 218 }
 219
 220 static int jz_bat_resume(struct platform_device *pdev)
 221 {
 222         struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
 223
 224         bat_info->bat_status =  POWER_SUPPLY_STATUS_UNKNOWN;
 225
 226         cancel_delayed_work(&bat_info->bat_work);
 227         queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ/10);
 228
 229         return 0;
 230 }
 231 #else
 232 #define jz_bat_suspend NULL
 233 #define jz_bat_resume NULL
 234 #endif
 235
 236 static int jz_bat_probe(struct platform_device *pdev)
 237 {
 238         int ret = 0;
 239         struct jz_battery_info *bat_info;
 240
 241         if (!pdev->dev.platform_data) {
 242                 dev_err(&pdev->dev, "Please set battery info\n");
 243                 return -EINVAL;
 244         }
 245
 246         bat_info = kzalloc(sizeof(struct jz_battery_info), GFP_KERNEL);
 247
 248         if (!bat_info) {
 249                 return -ENOMEM;
 250         }
 251
 252         platform_set_drvdata(pdev, bat_info);
 253         bat_info->pdata = pdev->dev.platform_data;
 254         bat_info->bat = bat_ps;
 255         mutex_init(&bat_info->work_lock);
 256         INIT_DELAYED_WORK(&bat_info->bat_work, jz_bat_work);
 257
 258         if (gpio_is_valid(bat_info->pdata->charg_stat_gpio)) {
 259                 ret = gpio_request(bat_info->pdata->charg_stat_gpio, "CHARG STAT");
 260                 if (ret) {
 261                         dev_err(&pdev->dev, "charger state gpio request failed.\n");
 262                         goto err_charg_gpio_request;
 263                 }
 264                 ret = gpio_direction_input(bat_info->pdata->charg_stat_gpio);
 265                 if (ret) {
 266                         dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
 267                         goto err_charg_gpio_direction;
 268                 }
 269
 270                 ret = power_supply_register(&pdev->dev, &bat_info->bat);
 271                 if (ret) {
 272                         dev_err(&pdev->dev, "power supply battery register failed.\n");
 273                         goto err_power_register_bat;
 274                 } else {
 275                         bat_info->monitor_wqueue = create_singlethread_workqueue("jz_battery");
 276                         if (!bat_info->monitor_wqueue) {
 277                                 return -ESRCH;
 278                         }
 279                         queue_delayed_work(bat_info->monitor_wqueue, &bat_info->bat_work, HZ * 1);
 280                 }
 281         }
 282         printk(KERN_INFO "jz_bat init success.\n");
 283         return ret;
 284
 285 err_power_register_bat:
 286 err_charg_gpio_direction:
 287         gpio_free(bat_info->pdata->charg_stat_gpio);
 288 err_charg_gpio_request:
 289         kfree(bat_info);
 290         return ret;
 291 }
 292
 293 static int jz_bat_remove(struct platform_device *pdev)
 294 {
 295         struct jz_battery_info *bat_info = platform_get_drvdata(pdev);
 296
 297         if (bat_info->pdata) {
 298                 if (gpio_is_valid(bat_info->pdata->charg_stat_gpio))
 299                         gpio_free(bat_info->pdata->charg_stat_gpio);
 300         }
 301
 302         power_supply_unregister(&bat_ps);
 303
 304         return 0;
 305 }
 306
 307 static struct platform_driver jz_bat_driver = {
 308         .probe          = jz_bat_probe,
 309         .remove         = __devexit_p(jz_bat_remove),
 310         .suspend        = jz_bat_suspend,
 311         .resume         = jz_bat_resume,
 312         .driver = {
 313                 .name = "jz4740-battery",
 314                 .owner = THIS_MODULE,
 315         },
 316 };
 317
 318 static int __init jz_bat_init(void)
 319 {
 320         return platform_driver_register(&jz_bat_driver);
 321 }
 322 module_init(jz_bat_init);
 323
 324 static void __exit jz_bat_exit(void)
 325 {
 326         platform_driver_unregister(&jz_bat_driver);
 327 }
 328 module_exit(jz_bat_exit);
 329
 330 MODULE_LICENSE("GPL");
 331 MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
 332 MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");