diff options
Diffstat (limited to 'drivers/power/rx51_battery.c')
| -rw-r--r-- | drivers/power/rx51_battery.c | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/drivers/power/rx51_battery.c b/drivers/power/rx51_battery.c deleted file mode 100644 index 8a6288d87056..000000000000 --- a/drivers/power/rx51_battery.c +++ /dev/null @@ -1,247 +0,0 @@ -/* - * Nokia RX-51 battery driver - * - * Copyright (C) 2012 Pali Rohár <pali.rohar@gmail.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include <linux/module.h> -#include <linux/param.h> -#include <linux/platform_device.h> -#include <linux/power_supply.h> -#include <linux/slab.h> -#include <linux/i2c/twl4030-madc.h> - -struct rx51_device_info { - struct device *dev; - struct power_supply bat; -}; - -/* - * Read ADCIN channel value, code copied from maemo kernel - */ -static int rx51_battery_read_adc(int channel) -{ - struct twl4030_madc_request req; - - req.channels = 1 << channel; - req.do_avg = 1; - req.method = TWL4030_MADC_SW1; - req.func_cb = NULL; - req.type = TWL4030_MADC_WAIT; - req.raw = true; - - if (twl4030_madc_conversion(&req) <= 0) - return -ENODATA; - - return req.rbuf[channel]; -} - -/* - * Read ADCIN channel 12 (voltage) and convert RAW value to micro voltage - * This conversion formula was extracted from maemo program bsi-read - */ -static int rx51_battery_read_voltage(struct rx51_device_info *di) -{ - int voltage = rx51_battery_read_adc(12); - - if (voltage < 0) - return voltage; - - return 1000 * (10000 * voltage / 1705); -} - -/* - * Temperature look-up tables - * TEMP = (1/(t1 + 1/298) - 273.15) - * Where t1 = (1/B) * ln((RAW_ADC_U * 2.5)/(R * I * 255)) - * Formula is based on experimental data, RX-51 CAL data, maemo program bme - * and formula from da9052 driver with values R = 100, B = 3380, I = 0.00671 - */ - -/* - * Table1 (temperature for first 25 RAW values) - * Usage: TEMP = rx51_temp_table1[RAW] - * RAW is between 1 and 24 - * TEMP is between 201 C and 55 C - */ -static u8 rx51_temp_table1[] = { - 255, 201, 159, 138, 124, 114, 106, 99, 94, 89, 85, 82, 78, 75, - 73, 70, 68, 66, 64, 62, 61, 59, 57, 56, 55 -}; - -/* - * Table2 (lowest RAW value for temperature) - * Usage: RAW = rx51_temp_table2[TEMP-rx51_temp_table2_first] - * TEMP is between 53 C and -32 C - * RAW is between 25 and 993 - */ -#define rx51_temp_table2_first 53 -static u16 rx51_temp_table2[] = { - 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, - 40, 41, 43, 44, 46, 48, 49, 51, 53, 55, 57, 59, 61, 64, - 66, 69, 71, 74, 77, 80, 83, 86, 90, 94, 97, 101, 106, 110, - 115, 119, 125, 130, 136, 141, 148, 154, 161, 168, 176, 184, 202, 211, - 221, 231, 242, 254, 266, 279, 293, 308, 323, 340, 357, 375, 395, 415, - 437, 460, 485, 511, 539, 568, 600, 633, 669, 706, 747, 790, 836, 885, - 937, 993, 1024 -}; - -/* - * Read ADCIN channel 0 (battery temp) and convert value to tenths of Celsius - * Use Temperature look-up tables for conversation - */ -static int rx51_battery_read_temperature(struct rx51_device_info *di) -{ - int min = 0; - int max = ARRAY_SIZE(rx51_temp_table2) - 1; - int raw = rx51_battery_read_adc(0); - - /* Zero and negative values are undefined */ - if (raw <= 0) - return INT_MAX; - - /* ADC channels are 10 bit, higher value are undefined */ - if (raw >= (1 << 10)) - return INT_MIN; - - /* First check for temperature in first direct table */ - if (raw < ARRAY_SIZE(rx51_temp_table1)) - return rx51_temp_table1[raw] * 10; - - /* Binary search RAW value in second inverse table */ - while (max - min > 1) { - int mid = (max + min) / 2; - if (rx51_temp_table2[mid] <= raw) - min = mid; - else if (rx51_temp_table2[mid] > raw) - max = mid; - if (rx51_temp_table2[mid] == raw) - break; - } - - return (rx51_temp_table2_first - min) * 10; -} - -/* - * Read ADCIN channel 4 (BSI) and convert RAW value to micro Ah - * This conversion formula was extracted from maemo program bsi-read - */ -static int rx51_battery_read_capacity(struct rx51_device_info *di) -{ - int capacity = rx51_battery_read_adc(4); - - if (capacity < 0) - return capacity; - - return 1280 * (1200 * capacity)/(1024 - capacity); -} - -/* - * Return power_supply property - */ -static int rx51_battery_get_property(struct power_supply *psy, - enum power_supply_property psp, - union power_supply_propval *val) -{ - struct rx51_device_info *di = container_of((psy), - struct rx51_device_info, bat); - - switch (psp) { - case POWER_SUPPLY_PROP_TECHNOLOGY: - val->intval = POWER_SUPPLY_TECHNOLOGY_LION; - break; - case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: - val->intval = 4200000; - break; - case POWER_SUPPLY_PROP_PRESENT: - val->intval = rx51_battery_read_voltage(di) ? 1 : 0; - break; - case POWER_SUPPLY_PROP_VOLTAGE_NOW: - val->intval = rx51_battery_read_voltage(di); - break; - case POWER_SUPPLY_PROP_TEMP: - val->intval = rx51_battery_read_temperature(di); - break; - case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: - val->intval = rx51_battery_read_capacity(di); - break; - default: - return -EINVAL; - } - - if (val->intval == INT_MAX || val->intval == INT_MIN) - return -EINVAL; - - return 0; -} - -static enum power_supply_property rx51_battery_props[] = { - POWER_SUPPLY_PROP_TECHNOLOGY, - POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, - POWER_SUPPLY_PROP_PRESENT, - POWER_SUPPLY_PROP_VOLTAGE_NOW, - POWER_SUPPLY_PROP_TEMP, - POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, -}; - -static int rx51_battery_probe(struct platform_device *pdev) -{ - struct rx51_device_info *di; - int ret; - - di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); - if (!di) - return -ENOMEM; - - platform_set_drvdata(pdev, di); - - di->bat.name = dev_name(&pdev->dev); - di->bat.type = POWER_SUPPLY_TYPE_BATTERY; - di->bat.properties = rx51_battery_props; - di->bat.num_properties = ARRAY_SIZE(rx51_battery_props); - di->bat.get_property = rx51_battery_get_property; - - ret = power_supply_register(di->dev, &di->bat); - if (ret) - return ret; - - return 0; -} - -static int rx51_battery_remove(struct platform_device *pdev) -{ - struct rx51_device_info *di = platform_get_drvdata(pdev); - - power_supply_unregister(&di->bat); - - return 0; -} - -static struct platform_driver rx51_battery_driver = { - .probe = rx51_battery_probe, - .remove = rx51_battery_remove, - .driver = { - .name = "rx51-battery", - .owner = THIS_MODULE, - }, -}; -module_platform_driver(rx51_battery_driver); - -MODULE_ALIAS("platform:rx51-battery"); -MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); -MODULE_DESCRIPTION("Nokia RX-51 battery driver"); -MODULE_LICENSE("GPL"); |