317 lines
8.0 KiB
C
317 lines
8.0 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* h3xxx atmel micro companion support, battery subdevice
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* based on previous kernel 2.4 version
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* Author : Alessandro Gardich <gremlin@gremlin.it>
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* Author : Linus Walleij <linus.walleij@linaro.org>
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/ipaq-micro.h>
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#include <linux/power_supply.h>
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#include <linux/workqueue.h>
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#define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
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#define MICRO_BATT_CHEM_ALKALINE 0x01
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#define MICRO_BATT_CHEM_NICD 0x02
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#define MICRO_BATT_CHEM_NIMH 0x03
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#define MICRO_BATT_CHEM_LION 0x04
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#define MICRO_BATT_CHEM_LIPOLY 0x05
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#define MICRO_BATT_CHEM_NOT_INSTALLED 0x06
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#define MICRO_BATT_CHEM_UNKNOWN 0xff
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#define MICRO_BATT_STATUS_HIGH 0x01
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#define MICRO_BATT_STATUS_LOW 0x02
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#define MICRO_BATT_STATUS_CRITICAL 0x04
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#define MICRO_BATT_STATUS_CHARGING 0x08
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#define MICRO_BATT_STATUS_CHARGEMAIN 0x10
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#define MICRO_BATT_STATUS_DEAD 0x20 /* Battery will not charge */
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#define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */
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#define MICRO_BATT_STATUS_FULL 0x40 /* Battery fully charged */
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#define MICRO_BATT_STATUS_NOBATTERY 0x80
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#define MICRO_BATT_STATUS_UNKNOWN 0xff
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struct micro_battery {
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struct ipaq_micro *micro;
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struct workqueue_struct *wq;
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struct delayed_work update;
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u8 ac;
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u8 chemistry;
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unsigned int voltage;
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u16 temperature;
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u8 flag;
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};
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static void micro_battery_work(struct work_struct *work)
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{
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struct micro_battery *mb = container_of(work,
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struct micro_battery, update.work);
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struct ipaq_micro_msg msg_battery = {
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.id = MSG_BATTERY,
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};
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struct ipaq_micro_msg msg_sensor = {
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.id = MSG_THERMAL_SENSOR,
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};
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/* First send battery message */
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ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
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if (msg_battery.rx_len < 4)
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pr_info("ERROR");
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/*
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* Returned message format:
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* byte 0: 0x00 = Not plugged in
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* 0x01 = AC adapter plugged in
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* byte 1: chemistry
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* byte 2: voltage LSB
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* byte 3: voltage MSB
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* byte 4: flags
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* byte 5-9: same for battery 2
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*/
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mb->ac = msg_battery.rx_data[0];
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mb->chemistry = msg_battery.rx_data[1];
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mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
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msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
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mb->flag = msg_battery.rx_data[4];
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if (msg_battery.rx_len == 9)
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pr_debug("second battery ignored\n");
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/* Then read the sensor */
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ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
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mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
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queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
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}
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static int get_capacity(struct power_supply *b)
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{
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struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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switch (mb->flag & 0x07) {
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case MICRO_BATT_STATUS_HIGH:
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return 100;
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break;
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case MICRO_BATT_STATUS_LOW:
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return 50;
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break;
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case MICRO_BATT_STATUS_CRITICAL:
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return 5;
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break;
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default:
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break;
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}
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return 0;
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}
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static int get_status(struct power_supply *b)
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{
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struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
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return POWER_SUPPLY_STATUS_UNKNOWN;
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if (mb->flag & MICRO_BATT_STATUS_FULL)
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return POWER_SUPPLY_STATUS_FULL;
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if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
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(mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
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return POWER_SUPPLY_STATUS_CHARGING;
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return POWER_SUPPLY_STATUS_DISCHARGING;
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}
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static int micro_batt_get_property(struct power_supply *b,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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switch (psp) {
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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switch (mb->chemistry) {
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case MICRO_BATT_CHEM_NICD:
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val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
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break;
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case MICRO_BATT_CHEM_NIMH:
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val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
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break;
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case MICRO_BATT_CHEM_LION:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case MICRO_BATT_CHEM_LIPOLY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
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break;
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default:
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val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
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break;
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};
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break;
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = get_status(b);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = 4700000;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = get_capacity(b);
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = mb->temperature;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = mb->voltage;
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break;
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default:
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return -EINVAL;
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};
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return 0;
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}
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static int micro_ac_get_property(struct power_supply *b,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = mb->ac;
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break;
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default:
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return -EINVAL;
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};
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return 0;
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}
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static enum power_supply_property micro_batt_power_props[] = {
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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static const struct power_supply_desc micro_batt_power_desc = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = micro_batt_power_props,
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.num_properties = ARRAY_SIZE(micro_batt_power_props),
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.get_property = micro_batt_get_property,
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.use_for_apm = 1,
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};
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static enum power_supply_property micro_ac_power_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static const struct power_supply_desc micro_ac_power_desc = {
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.name = "ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = micro_ac_power_props,
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.num_properties = ARRAY_SIZE(micro_ac_power_props),
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.get_property = micro_ac_get_property,
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};
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static struct power_supply *micro_batt_power, *micro_ac_power;
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static int micro_batt_probe(struct platform_device *pdev)
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{
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struct micro_battery *mb;
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int ret;
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mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
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if (!mb)
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return -ENOMEM;
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mb->micro = dev_get_drvdata(pdev->dev.parent);
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mb->wq = create_singlethread_workqueue("ipaq-battery-wq");
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if (!mb->wq)
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return -ENOMEM;
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INIT_DELAYED_WORK(&mb->update, micro_battery_work);
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platform_set_drvdata(pdev, mb);
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queue_delayed_work(mb->wq, &mb->update, 1);
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micro_batt_power = power_supply_register(&pdev->dev,
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µ_batt_power_desc, NULL);
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if (IS_ERR(micro_batt_power)) {
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ret = PTR_ERR(micro_batt_power);
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goto batt_err;
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}
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micro_ac_power = power_supply_register(&pdev->dev,
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µ_ac_power_desc, NULL);
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if (IS_ERR(micro_ac_power)) {
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ret = PTR_ERR(micro_ac_power);
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goto ac_err;
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}
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dev_info(&pdev->dev, "iPAQ micro battery driver\n");
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return 0;
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ac_err:
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power_supply_unregister(micro_batt_power);
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batt_err:
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cancel_delayed_work_sync(&mb->update);
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destroy_workqueue(mb->wq);
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return ret;
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}
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static int micro_batt_remove(struct platform_device *pdev)
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{
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struct micro_battery *mb = platform_get_drvdata(pdev);
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power_supply_unregister(micro_ac_power);
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power_supply_unregister(micro_batt_power);
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cancel_delayed_work_sync(&mb->update);
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destroy_workqueue(mb->wq);
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return 0;
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}
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static int __maybe_unused micro_batt_suspend(struct device *dev)
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{
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struct micro_battery *mb = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&mb->update);
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return 0;
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}
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static int __maybe_unused micro_batt_resume(struct device *dev)
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{
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struct micro_battery *mb = dev_get_drvdata(dev);
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queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
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return 0;
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}
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static const struct dev_pm_ops micro_batt_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
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};
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static struct platform_driver micro_batt_device_driver = {
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.driver = {
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.name = "ipaq-micro-battery",
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.pm = µ_batt_dev_pm_ops,
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},
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.probe = micro_batt_probe,
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.remove = micro_batt_remove,
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};
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module_platform_driver(micro_batt_device_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
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MODULE_ALIAS("platform:battery-ipaq-micro");
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