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