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313 lines
7.8 KiB
313 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Author : Linus Walleij <[email protected]> |
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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 = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0); |
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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:ipaq-micro-battery");
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