power_supply: Add new Nokia RX-51 (N900) power supply battery driver (04930baf) · Commits · 戴 / test

drivers/power/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -245,6 +245,13 @@ config BATTERY_INTEL_MID
		Say Y here to enable the battery driver on Intel MID
		platforms.

		config BATTERY_RX51
		tristate "Nokia RX-51 (N900) battery driver"
		depends on TWL4030_MADC
		help
		Say Y here to enable support for battery information on Nokia
		RX-51, also known as N900 tablet.

		config CHARGER_ISP1704
		tristate "ISP1704 USB Charger Detection"
		depends on USB_OTG_UTILS

drivers/power/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -37,6 +37,7 @@ obj-$(CONFIG_CHARGER_88PM860X) += 88pm860x_charger.o
		obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
		obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
		obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
		obj-$(CONFIG_BATTERY_RX51) += rx51_battery.o
		obj-$(CONFIG_AB8500_BM) += ab8500_charger.o ab8500_btemp.o ab8500_fg.o abx500_chargalg.o
		obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
		obj-$(CONFIG_CHARGER_MAX8903) += max8903_charger.o

drivers/power/rx51_battery.c

0 → 100644

+251 −0

Original line number	Diff line number	Diff line
		/*
		* 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;

		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] * 100;

		/* 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) * 100;
		}

		/*
		* 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 __devinit rx51_battery_probe(struct platform_device *pdev)
		{
		struct rx51_device_info *di;
		int ret;

		di = kzalloc(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) {
		platform_set_drvdata(pdev, NULL);
		kfree(di);
		return ret;
		}

		return 0;
		}

		static int __devexit rx51_battery_remove(struct platform_device *pdev)
		{
		struct rx51_device_info *di = platform_get_drvdata(pdev);

		power_supply_unregister(&di->bat);
		platform_set_drvdata(pdev, NULL);
		kfree(di);

		return 0;
		}

		static struct platform_driver rx51_battery_driver = {
		.probe = rx51_battery_probe,
		.remove = __devexit_p(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");

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