vcs.maemo.org Git - kernel-power/blob - kernel-power-2.6.28/debian/patches/rx51_battery.patch

   1 --- /dev/null
   2 +++ kernel-power/drivers/power/rx51_battery.c
   3 @@ -0,0 +1,216 @@
   4 +/*
   5 +    rx51_battery.c - Nokia RX-51 battery driver
   6 +    Copyright (C) 2012  Pali Rohár <pali.rohar@gmail.com>
   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 as published by
  10 +    the Free Software Foundation; either version 2 of the License, or
  11 +    (at your option) any later version.
  12 +
  13 +    This program is distributed in the hope that it will be useful,
  14 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 +    GNU General Public License for more details.
  17 +
  18 +    You should have received a copy of the GNU General Public License along
  19 +    with this program; if not, write to the Free Software Foundation, Inc.,
  20 +    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 +*/
  22 +
  23 +#include <linux/module.h>
  24 +#include <linux/param.h>
  25 +#include <linux/platform_device.h>
  26 +#include <linux/power_supply.h>
  27 +#include <linux/slab.h>
  28 +#include <linux/i2c/twl4030-madc.h>
  29 +
  30 +struct rx51_device_info {
  31 +       struct device *dev;
  32 +       struct power_supply bat;
  33 +};
  34 +
  35 +/* Read ADCIN channel value, code copied from maemo kernel */
  36 +static int rx51_battery_read_adc(int channel)
  37 +{
  38 +       struct twl4030_madc_request req;
  39 +
  40 +       req.channels = (1 << channel);
  41 +       req.do_avg = 1;
  42 +       req.method = TWL4030_MADC_SW1;
  43 +       req.func_cb = NULL;
  44 +       req.type = TWL4030_MADC_WAIT;
  45 +
  46 +       if (twl4030_madc_conversion(&req) > 0)
  47 +               return (u16)req.rbuf[channel];
  48 +       else
  49 +               return -ENODATA;
  50 +}
  51 +
  52 +/* Read ADCIN channel 12 (voltage) and convert RAW value to micro voltage */
  53 +/* This conversion formula was extracted from maemo program bsi-read */
  54 +static int rx51_battery_read_voltage(struct rx51_device_info *di)
  55 +{
  56 +       int voltage = rx51_battery_read_adc(12);
  57 +       if (voltage < 0)
  58 +               return voltage;
  59 +       return 1000 * (10000 * voltage / 1705);
  60 +}
  61 +
  62 +/* Conversation table based on experimental data */
  63 +/* Usage: rx51_temp_table[rx51_temp_first - Celsius value] = lowest RAW value */
  64 +static int rx51_temp_first = 48;
  65 +static int rx51_temp_table[] = {
  66 +        30,  31,  32,  33,  34,  35,  36,  38,  39,  40,  42,  43,  45,  47,
  67 +        48,  50,  51,  53,  55,  57,  59,  61,  63,  66,  69,  72,  74,  76,
  68 +        80,  83,  86,  90,  93,  96, 100, 105, 109, 114, 119, 124, 130, 136,
  69 +       142, 148, 155, 161, 166, 177, 184, 193, 202, 213, 222, 230, 243, 255,
  70 +       268, 280
  71 +};
  72 +
  73 +/* Read ADCIN channel 0 (battery temp) and convert value to tenths of Celsius */
  74 +/* Try to find lowest temperature value for raw value in table */
  75 +static int rx51_battery_read_temperature(struct rx51_device_info *di)
  76 +{
  77 +       int min = 0;
  78 +       int max = ARRAY_SIZE(rx51_temp_table)-1;
  79 +       int temperature = rx51_battery_read_adc(0);
  80 +
  81 +       if (temperature < 0)
  82 +               return temperature;
  83 +       if (temperature < rx51_temp_table[min])
  84 +               return rx51_temp_first-min+1;
  85 +       if (temperature > rx51_temp_table[max])
  86 +               return rx51_temp_first-max-1;
  87 +
  88 +       while (max-min > 1) {
  89 +               int mid = (max+min)/2;
  90 +               if (rx51_temp_table[mid] <= temperature)
  91 +                       min = mid;
  92 +               else if (rx51_temp_table[mid] > temperature)
  93 +                       max = mid;
  94 +               if (rx51_temp_table[mid] == temperature)
  95 +                       break;
  96 +       }
  97 +
  98 +       return (rx51_temp_first - min) * 100;
  99 +}
 100 +
 101 +/* Read ADCIN channel 4 (BSI) and convert RAW value to micro Ah */
 102 +/* This conversion formula was extracted from maemo program bsi-read */
 103 +static int rx51_battery_read_capacity(struct rx51_device_info *di)
 104 +{
 105 +       int capacity = rx51_battery_read_adc(4);
 106 +       if (capacity < 0)
 107 +               return capacity;
 108 +       return 1280 * (1200 * capacity)/(1024 - capacity);
 109 +}
 110 +
 111 +/* Return power_supply property */
 112 +static int rx51_battery_get_property(struct power_supply *psy,
 113 +                                       enum power_supply_property psp,
 114 +                                       union power_supply_propval *val)
 115 +{
 116 +       struct rx51_device_info *di = container_of((psy),
 117 +                               struct rx51_device_info, bat);
 118 +
 119 +       switch (psp) {
 120 +       case POWER_SUPPLY_PROP_TECHNOLOGY:
 121 +               val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 122 +               break;
 123 +       case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 124 +               val->intval = 4200000;
 125 +               break;
 126 +       case POWER_SUPPLY_PROP_PRESENT:
 127 +               val->intval = rx51_battery_read_voltage(di) ? 1 : 0;
 128 +               break;
 129 +       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 130 +               val->intval = rx51_battery_read_voltage(di);
 131 +               break;
 132 +       case POWER_SUPPLY_PROP_TEMP:
 133 +               val->intval = rx51_battery_read_temperature(di);
 134 +               break;
 135 +       case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 136 +               val->intval = rx51_battery_read_capacity(di);
 137 +               break;
 138 +       default:
 139 +               return -EINVAL;
 140 +       }
 141 +
 142 +       if (val->intval < 0)
 143 +               return val->intval;
 144 +
 145 +       return 0;
 146 +}
 147 +
 148 +static enum power_supply_property rx51_battery_props[] = {
 149 +       POWER_SUPPLY_PROP_TECHNOLOGY,
 150 +       POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 151 +       POWER_SUPPLY_PROP_PRESENT,
 152 +       POWER_SUPPLY_PROP_VOLTAGE_NOW,
 153 +       POWER_SUPPLY_PROP_TEMP,
 154 +       POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 155 +};
 156 +
 157 +static int __devinit rx51_battery_probe(struct platform_device *pdev)
 158 +{
 159 +       struct rx51_device_info *di;
 160 +       int ret;
 161 +
 162 +       di = kzalloc(sizeof(*di), GFP_KERNEL);
 163 +       if (!di)
 164 +               return -ENOMEM;
 165 +
 166 +       platform_set_drvdata(pdev, di);
 167 +
 168 +       di->bat.name = dev_name(&pdev->dev);
 169 +       di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 170 +       di->bat.properties = rx51_battery_props;
 171 +       di->bat.num_properties = ARRAY_SIZE(rx51_battery_props);
 172 +       di->bat.get_property = rx51_battery_get_property;
 173 +
 174 +       ret = power_supply_register(di->dev, &di->bat);
 175 +       if (ret) {
 176 +               platform_set_drvdata(pdev, NULL);
 177 +               kfree(di);
 178 +               return ret;
 179 +       }
 180 +
 181 +       return 0;
 182 +}
 183 +
 184 +static int __devexit rx51_battery_remove(struct platform_device *pdev)
 185 +{
 186 +       struct rx51_device_info *di = platform_get_drvdata(pdev);
 187 +
 188 +       power_supply_unregister(&di->bat);
 189 +       platform_set_drvdata(pdev, NULL);
 190 +       kfree(di);
 191 +
 192 +       return 0;
 193 +}
 194 +
 195 +static struct platform_driver rx51_battery_driver = {
 196 +       .probe = rx51_battery_probe,
 197 +       .remove = __devexit_p(rx51_battery_remove),
 198 +       .driver = {
 199 +               .name = "rx51-battery",
 200 +               .owner = THIS_MODULE,
 201 +       },
 202 +};
 203 +
 204 +static int __init rx51_battery_init(void)
 205 +{
 206 +       return platform_driver_register(&rx51_battery_driver);
 207 +}
 208 +module_init(rx51_battery_init);
 209 +
 210 +static void __exit rx51_battery_exit(void)
 211 +{
 212 +       platform_driver_unregister(&rx51_battery_driver);
 213 +}
 214 +module_exit(rx51_battery_exit);
 215 +
 216 +MODULE_ALIAS("platform:rx51-battery");
 217 +MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
 218 +MODULE_DESCRIPTION("Nokia RX-51 battery driver");
 219 +MODULE_LICENSE("GPL");