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 +1,217 @@
   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 (((((2099203 - (1LL<<31)) * voltage * 6000) >> 32) -
  60 +               ((voltage * 6000LL << 1) >> 32) + (voltage * 6000)) >> 9)*1000;
  61 +}
  62 +
  63 +/* Conversation table based on experimental data */
  64 +/* Usage: rx51_temp_table[rx51_temp_first - Celsius value] = lowest RAW value */
  65 +static int rx51_temp_first = 48;
  66 +static int rx51_temp_table[] = {
  67 +        30,  31,  32,  33,  34,  35,  36,  38,  39,  40,  42,  43,  45,  47,
  68 +        48,  50,  51,  53,  55,  57,  59,  61,  63,  66,  69,  72,  74,  76,
  69 +        80,  83,  86,  90,  93,  96, 100, 105, 109, 114, 119, 124, 130, 136,
  70 +       142, 148, 155, 161, 166, 177, 184, 193, 202, 213, 222, 230, 243, 255,
  71 +       268, 280
  72 +};
  73 +
  74 +/* Read ADCIN channel 0 (battery temp) and convert value to tenths of Celsius */
  75 +/* Try to find lowest temperature value for raw value in table */
  76 +static int rx51_battery_read_temperature(struct rx51_device_info *di)
  77 +{
  78 +       int min = 0;
  79 +       int max = ARRAY_SIZE(rx51_temp_table)-1;
  80 +       int temperature = rx51_battery_read_adc(0);
  81 +
  82 +       if (temperature < 0)
  83 +               return temperature;
  84 +       if (temperature < rx51_temp_table[min])
  85 +               return rx51_temp_first-min+1;
  86 +       if (temperature > rx51_temp_table[max])
  87 +               return rx51_temp_first-max-1;
  88 +
  89 +       while (max-min > 1) {
  90 +               int mid = (max+min)/2;
  91 +               if (rx51_temp_table[mid] <= temperature)
  92 +                       min = mid;
  93 +               else if (rx51_temp_table[mid] > temperature)
  94 +                       max = mid;
  95 +               if (rx51_temp_table[mid] == temperature)
  96 +                       break;
  97 +       }
  98 +
  99 +       return (rx51_temp_first - min) * 100;
 100 +}
 101 +
 102 +/* Read ADCIN channel 4 (BSI) and convert RAW value to micro Ah */
 103 +/* This conversion formula was extracted from maemo program bsi-read */
 104 +static int rx51_battery_read_capacity(struct rx51_device_info *di)
 105 +{
 106 +       int capacity = rx51_battery_read_adc(4);
 107 +       if (capacity < 0)
 108 +               return capacity;
 109 +       return 1280 * (1200 * capacity)/(1024 - capacity);
 110 +}
 111 +
 112 +/* Return power_supply property */
 113 +static int rx51_battery_get_property(struct power_supply *psy,
 114 +                                       enum power_supply_property psp,
 115 +                                       union power_supply_propval *val)
 116 +{
 117 +       struct rx51_device_info *di = container_of((psy),
 118 +                               struct rx51_device_info, bat);
 119 +
 120 +       switch (psp) {
 121 +       case POWER_SUPPLY_PROP_TECHNOLOGY:
 122 +               val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 123 +               break;
 124 +       case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 125 +               val->intval = 4200000;
 126 +               break;
 127 +       case POWER_SUPPLY_PROP_PRESENT:
 128 +               val->intval = rx51_battery_read_voltage(di) ? 1 : 0;
 129 +               break;
 130 +       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 131 +               val->intval = rx51_battery_read_voltage(di);
 132 +               break;
 133 +       case POWER_SUPPLY_PROP_TEMP:
 134 +               val->intval = rx51_battery_read_temperature(di);
 135 +               break;
 136 +       case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 137 +               val->intval = rx51_battery_read_capacity(di);
 138 +               break;
 139 +       default:
 140 +               return -EINVAL;
 141 +       }
 142 +
 143 +       if (val->intval < 0)
 144 +               return val->intval;
 145 +
 146 +       return 0;
 147 +}
 148 +
 149 +static enum power_supply_property rx51_battery_props[] = {
 150 +       POWER_SUPPLY_PROP_TECHNOLOGY,
 151 +       POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 152 +       POWER_SUPPLY_PROP_PRESENT,
 153 +       POWER_SUPPLY_PROP_VOLTAGE_NOW,
 154 +       POWER_SUPPLY_PROP_TEMP,
 155 +       POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 156 +};
 157 +
 158 +static int __devinit rx51_battery_probe(struct platform_device *pdev)
 159 +{
 160 +       struct rx51_device_info *di;
 161 +       int ret;
 162 +
 163 +       di = kzalloc(sizeof(*di), GFP_KERNEL);
 164 +       if (!di)
 165 +               return -ENOMEM;
 166 +
 167 +       platform_set_drvdata(pdev, di);
 168 +
 169 +       di->bat.name = dev_name(&pdev->dev);
 170 +       di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 171 +       di->bat.properties = rx51_battery_props;
 172 +       di->bat.num_properties = ARRAY_SIZE(rx51_battery_props);
 173 +       di->bat.get_property = rx51_battery_get_property;
 174 +
 175 +       ret = power_supply_register(di->dev, &di->bat);
 176 +       if (ret) {
 177 +               platform_set_drvdata(pdev, NULL);
 178 +               kfree(di);
 179 +               return ret;
 180 +       }
 181 +
 182 +       return 0;
 183 +}
 184 +
 185 +static int __devexit rx51_battery_remove(struct platform_device *pdev)
 186 +{
 187 +       struct rx51_device_info *di = platform_get_drvdata(pdev);
 188 +
 189 +       power_supply_unregister(&di->bat);
 190 +       platform_set_drvdata(pdev, NULL);
 191 +       kfree(di);
 192 +
 193 +       return 0;
 194 +}
 195 +
 196 +static struct platform_driver rx51_battery_driver = {
 197 +       .probe = rx51_battery_probe,
 198 +       .remove = __devexit_p(rx51_battery_remove),
 199 +       .driver = {
 200 +               .name = "rx51-battery",
 201 +               .owner = THIS_MODULE,
 202 +       },
 203 +};
 204 +
 205 +static int __init rx51_battery_init(void)
 206 +{
 207 +       return platform_driver_register(&rx51_battery_driver);
 208 +}
 209 +module_init(rx51_battery_init);
 210 +
 211 +static void __exit rx51_battery_exit(void)
 212 +{
 213 +       platform_driver_unregister(&rx51_battery_driver);
 214 +}
 215 +module_exit(rx51_battery_exit);
 216 +
 217 +MODULE_ALIAS("platform:rx51-battery");
 218 +MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
 219 +MODULE_DESCRIPTION("Nokia RX-51 battery driver");
 220 +MODULE_LICENSE("GPL");