drivers/power/ipaq_micro_battery.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  *
   6  * h3xxx atmel micro companion support, battery subdevice
   7  * based on previous kernel 2.4 version
   8  * Author : Alessandro Gardich <gremlin@gremlin.it>
   9  * Author : Linus Walleij <linus.walleij@linaro.org>
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mfd/ipaq-micro.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/workqueue.h>
  19
  20 #define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
  21
  22 #define MICRO_BATT_CHEM_ALKALINE        0x01
  23 #define MICRO_BATT_CHEM_NICD            0x02
  24 #define MICRO_BATT_CHEM_NIMH            0x03
  25 #define MICRO_BATT_CHEM_LION            0x04
  26 #define MICRO_BATT_CHEM_LIPOLY          0x05
  27 #define MICRO_BATT_CHEM_NOT_INSTALLED   0x06
  28 #define MICRO_BATT_CHEM_UNKNOWN         0xff
  29
  30 #define MICRO_BATT_STATUS_HIGH          0x01
  31 #define MICRO_BATT_STATUS_LOW           0x02
  32 #define MICRO_BATT_STATUS_CRITICAL      0x04
  33 #define MICRO_BATT_STATUS_CHARGING      0x08
  34 #define MICRO_BATT_STATUS_CHARGEMAIN    0x10
  35 #define MICRO_BATT_STATUS_DEAD          0x20 /* Battery will not charge */
  36 #define MICRO_BATT_STATUS_NOTINSTALLED  0x20 /* For expansion pack batteries */
  37 #define MICRO_BATT_STATUS_FULL          0x40 /* Battery fully charged */
  38 #define MICRO_BATT_STATUS_NOBATTERY     0x80
  39 #define MICRO_BATT_STATUS_UNKNOWN       0xff
  40
  41 struct micro_battery {
  42         struct ipaq_micro *micro;
  43         struct workqueue_struct *wq;
  44         struct delayed_work update;
  45         u8 ac;
  46         u8 chemistry;
  47         unsigned int voltage;
  48         u16 temperature;
  49         u8 flag;
  50 };
  51
  52 static void micro_battery_work(struct work_struct *work)
  53 {
  54         struct micro_battery *mb = container_of(work,
  55                                 struct micro_battery, update.work);
  56         struct ipaq_micro_msg msg_battery = {
  57                 .id = MSG_BATTERY,
  58         };
  59         struct ipaq_micro_msg msg_sensor = {
  60                 .id = MSG_THERMAL_SENSOR,
  61         };
  62
  63         /* First send battery message */
  64         ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
  65         if (msg_battery.rx_len < 4)
  66                 pr_info("ERROR");
  67
  68         /*
  69          * Returned message format:
  70          * byte 0:   0x00 = Not plugged in
  71          *           0x01 = AC adapter plugged in
  72          * byte 1:   chemistry
  73          * byte 2:   voltage LSB
  74          * byte 3:   voltage MSB
  75          * byte 4:   flags
  76          * byte 5-9: same for battery 2
  77          */
  78         mb->ac = msg_battery.rx_data[0];
  79         mb->chemistry = msg_battery.rx_data[1];
  80         mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
  81                         msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
  82         mb->flag = msg_battery.rx_data[4];
  83
  84         if (msg_battery.rx_len == 9)
  85                 pr_debug("second battery ignored\n");
  86
  87         /* Then read the sensor */
  88         ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
  89         mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
  90
  91         queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
  92 }
  93
  94 static int get_capacity(struct power_supply *b)
  95 {
  96         struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
  97
  98         switch (mb->flag & 0x07) {
  99         case MICRO_BATT_STATUS_HIGH:
 100                 return 100;
 101                 break;
 102         case MICRO_BATT_STATUS_LOW:
 103                 return 50;
 104                 break;
 105         case MICRO_BATT_STATUS_CRITICAL:
 106                 return 5;
 107                 break;
 108         default:
 109                 break;
 110         }
 111         return 0;
 112 }
 113
 114 static int get_status(struct power_supply *b)
 115 {
 116         struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
 117
 118         if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
 119                 return POWER_SUPPLY_STATUS_UNKNOWN;
 120
 121         if (mb->flag & MICRO_BATT_STATUS_FULL)
 122                 return POWER_SUPPLY_STATUS_FULL;
 123
 124         if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
 125                 (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
 126                 return POWER_SUPPLY_STATUS_CHARGING;
 127
 128         return POWER_SUPPLY_STATUS_DISCHARGING;
 129 }
 130
 131 static int micro_batt_get_property(struct power_supply *b,
 132                                         enum power_supply_property psp,
 133                                         union power_supply_propval *val)
 134 {
 135         struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
 136
 137         switch (psp) {
 138         case POWER_SUPPLY_PROP_TECHNOLOGY:
 139                 switch (mb->chemistry) {
 140                 case MICRO_BATT_CHEM_NICD:
 141                         val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
 142                         break;
 143                 case MICRO_BATT_CHEM_NIMH:
 144                         val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
 145                         break;
 146                 case MICRO_BATT_CHEM_LION:
 147                         val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 148                         break;
 149                 case MICRO_BATT_CHEM_LIPOLY:
 150                         val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
 151                         break;
 152                 default:
 153                         val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 154                         break;
 155                 };
 156                 break;
 157         case POWER_SUPPLY_PROP_STATUS:
 158                 val->intval = get_status(b);
 159                 break;
 160         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 161                 val->intval = 4700000;
 162                 break;
 163         case POWER_SUPPLY_PROP_CAPACITY:
 164                 val->intval = get_capacity(b);
 165                 break;
 166         case POWER_SUPPLY_PROP_TEMP:
 167                 val->intval = mb->temperature;
 168                 break;
 169         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 170                 val->intval = mb->voltage;
 171                 break;
 172         default:
 173                 return -EINVAL;
 174         };
 175
 176         return 0;
 177 }
 178
 179 static int micro_ac_get_property(struct power_supply *b,
 180                                  enum power_supply_property psp,
 181                                  union power_supply_propval *val)
 182 {
 183         struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
 184
 185         switch (psp) {
 186         case POWER_SUPPLY_PROP_ONLINE:
 187                 val->intval = mb->ac;
 188                 break;
 189         default:
 190                 return -EINVAL;
 191         };
 192
 193         return 0;
 194 }
 195
 196 static enum power_supply_property micro_batt_power_props[] = {
 197         POWER_SUPPLY_PROP_TECHNOLOGY,
 198         POWER_SUPPLY_PROP_STATUS,
 199         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 200         POWER_SUPPLY_PROP_CAPACITY,
 201         POWER_SUPPLY_PROP_TEMP,
 202         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 203 };
 204
 205 static const struct power_supply_desc micro_batt_power_desc = {
 206         .name                   = "main-battery",
 207         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 208         .properties             = micro_batt_power_props,
 209         .num_properties         = ARRAY_SIZE(micro_batt_power_props),
 210         .get_property           = micro_batt_get_property,
 211         .use_for_apm            = 1,
 212 };
 213
 214 static enum power_supply_property micro_ac_power_props[] = {
 215         POWER_SUPPLY_PROP_ONLINE,
 216 };
 217
 218 static const struct power_supply_desc micro_ac_power_desc = {
 219         .name                   = "ac",
 220         .type                   = POWER_SUPPLY_TYPE_MAINS,
 221         .properties             = micro_ac_power_props,
 222         .num_properties         = ARRAY_SIZE(micro_ac_power_props),
 223         .get_property           = micro_ac_get_property,
 224 };
 225
 226 static struct power_supply *micro_batt_power, *micro_ac_power;
 227
 228 static int micro_batt_probe(struct platform_device *pdev)
 229 {
 230         struct micro_battery *mb;
 231         int ret;
 232
 233         mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
 234         if (!mb)
 235                 return -ENOMEM;
 236
 237         mb->micro = dev_get_drvdata(pdev->dev.parent);
 238         mb->wq = create_singlethread_workqueue("ipaq-battery-wq");
 239         if (!mb->wq)
 240                 return -ENOMEM;
 241
 242         INIT_DELAYED_WORK(&mb->update, micro_battery_work);
 243         platform_set_drvdata(pdev, mb);
 244         queue_delayed_work(mb->wq, &mb->update, 1);
 245
 246         micro_batt_power = power_supply_register(&pdev->dev,
 247                                                  &micro_batt_power_desc, NULL);
 248         if (IS_ERR(micro_batt_power)) {
 249                 ret = PTR_ERR(micro_batt_power);
 250                 goto batt_err;
 251         }
 252
 253         micro_ac_power = power_supply_register(&pdev->dev,
 254                                                &micro_ac_power_desc, NULL);
 255         if (IS_ERR(micro_ac_power)) {
 256                 ret = PTR_ERR(micro_ac_power);
 257                 goto ac_err;
 258         }
 259
 260         dev_info(&pdev->dev, "iPAQ micro battery driver\n");
 261         return 0;
 262
 263 ac_err:
 264         power_supply_unregister(micro_ac_power);
 265 batt_err:
 266         cancel_delayed_work_sync(&mb->update);
 267         destroy_workqueue(mb->wq);
 268         return ret;
 269 }
 270
 271 static int micro_batt_remove(struct platform_device *pdev)
 272
 273 {
 274         struct micro_battery *mb = platform_get_drvdata(pdev);
 275
 276         power_supply_unregister(micro_ac_power);
 277         power_supply_unregister(micro_batt_power);
 278         cancel_delayed_work_sync(&mb->update);
 279         destroy_workqueue(mb->wq);
 280
 281         return 0;
 282 }
 283
 284 static int micro_batt_suspend(struct device *dev)
 285 {
 286         struct micro_battery *mb = dev_get_drvdata(dev);
 287
 288         cancel_delayed_work_sync(&mb->update);
 289         return 0;
 290 }
 291
 292 static int micro_batt_resume(struct device *dev)
 293 {
 294         struct micro_battery *mb = dev_get_drvdata(dev);
 295
 296         queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
 297         return 0;
 298 }
 299
 300 static const struct dev_pm_ops micro_batt_dev_pm_ops = {
 301         SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
 302 };
 303
 304 static struct platform_driver micro_batt_device_driver = {
 305         .driver         = {
 306                 .name   = "ipaq-micro-battery",
 307                 .pm     = &micro_batt_dev_pm_ops,
 308         },
 309         .probe          = micro_batt_probe,
 310         .remove         = micro_batt_remove,
 311 };
 312 module_platform_driver(micro_batt_device_driver);
 313
 314 MODULE_LICENSE("GPL");
 315 MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
 316 MODULE_ALIAS("platform:battery-ipaq-micro");