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    Subject[PATCH v8 4/8] Loongson: YeeLoong: add battery driver
    Date
    From: Wu Zhangjin <wuzhangjin@gmail.com>

    This patch adds APM emulated Battery Driver, it provides standard
    interface(/proc/apm) for user-space applications(e.g. kpowersave,
    gnome-power-manager) to manage the battery.

    Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
    ---
    drivers/platform/mips/Kconfig | 2 +
    drivers/platform/mips/yeeloong_laptop.c | 108 ++++++++++++++++++++++++++++++-
    2 files changed, 108 insertions(+), 2 deletions(-)

    diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
    index c1ba03d..965933b 100644
    --- a/drivers/platform/mips/Kconfig
    +++ b/drivers/platform/mips/Kconfig
    @@ -18,6 +18,8 @@ config LEMOTE_YEELOONG2F
    tristate "Lemote YeeLoong Laptop"
    depends on LEMOTE_MACH2F
    select BACKLIGHT_CLASS_DEVICE
    + select SYS_SUPPORTS_APM_EMULATION
    + select APM_EMULATION
    help
    YeeLoong netbook is a mini laptop made by Lemote, which is basically
    compatible to FuLoong2F mini PC, but it has an extra Embedded
    diff --git a/drivers/platform/mips/yeeloong_laptop.c b/drivers/platform/mips/yeeloong_laptop.c
    index f04a7e2..0d9f2a6 100644
    --- a/drivers/platform/mips/yeeloong_laptop.c
    +++ b/drivers/platform/mips/yeeloong_laptop.c
    @@ -2,7 +2,7 @@
    * Driver for YeeLoong laptop extras
    *
    * Copyright (C) 2009 Lemote Inc.
    - * Author: Wu Zhangjin <wuzj@lemote.com>
    + * Author: Wu Zhangjin <wuzj@lemote.com>, Liu Junliang <liujl@lemote.com>
    *
    * 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
    @@ -13,6 +13,7 @@
    #include <linux/platform_device.h>
    #include <linux/backlight.h> /* for backlight subdriver */
    #include <linux/fb.h>
    +#include <linux/apm-emulation.h>/* for battery subdriver */

    #include <ec_kb3310b.h>

    @@ -85,6 +86,106 @@ static void yeeloong_backlight_exit(void)
    }
    }

    +/* battery subdriver */
    +
    +static void get_fixed_battery_info(void)
    +{
    + int design_cap, full_charged_cap, design_vol, vendor, cell_count;
    +
    + design_cap = (ec_read(REG_BAT_DESIGN_CAP_HIGH) << 8)
    + | ec_read(REG_BAT_DESIGN_CAP_LOW);
    + full_charged_cap = (ec_read(REG_BAT_FULLCHG_CAP_HIGH) << 8)
    + | ec_read(REG_BAT_FULLCHG_CAP_LOW);
    + design_vol = (ec_read(REG_BAT_DESIGN_VOL_HIGH) << 8)
    + | ec_read(REG_BAT_DESIGN_VOL_LOW);
    + vendor = ec_read(REG_BAT_VENDOR);
    + cell_count = ec_read(REG_BAT_CELL_COUNT);
    +
    + if (vendor != 0) {
    + pr_info("battery vendor(%s), cells count(%d), "
    + "with designed capacity(%d),designed voltage(%d),"
    + " full charged capacity(%d)\n",
    + (vendor ==
    + FLAG_BAT_VENDOR_SANYO) ? "SANYO" : "SIMPLO",
    + (cell_count == FLAG_BAT_CELL_3S1P) ? 3 : 6,
    + design_cap, design_vol,
    + full_charged_cap);
    + }
    +}
    +
    +#define APM_CRITICAL 5
    +
    +static void get_power_status(struct apm_power_info *info)
    +{
    + unsigned char bat_status;
    +
    + info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
    + info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
    + info->units = APM_UNITS_MINS;
    +
    + info->battery_life = (ec_read(REG_BAT_RELATIVE_CAP_HIGH) << 8) |
    + (ec_read(REG_BAT_RELATIVE_CAP_LOW));
    +
    + info->ac_line_status = (ec_read(REG_BAT_POWER) & BIT_BAT_POWER_ACIN) ?
    + APM_AC_ONLINE : APM_AC_OFFLINE;
    +
    + bat_status = ec_read(REG_BAT_STATUS);
    +
    + if (!(bat_status & BIT_BAT_STATUS_IN)) {
    + /* no battery inserted */
    + info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
    + info->battery_flag = APM_BATTERY_FLAG_NOT_PRESENT;
    + info->time = 0x00;
    + return;
    + }
    +
    + /* adapter inserted */
    + if (info->ac_line_status == APM_AC_ONLINE) {
    + if (!(bat_status & BIT_BAT_STATUS_FULL)) {
    + /* battery is not fully charged */
    + info->battery_status = APM_BATTERY_STATUS_CHARGING;
    + info->battery_flag = APM_BATTERY_FLAG_CHARGING;
    + } else {
    + /* battery is fully charged */
    + info->battery_status = APM_BATTERY_STATUS_HIGH;
    + info->battery_flag = APM_BATTERY_FLAG_HIGH;
    + info->battery_life = 100;
    + }
    + } else {
    + /* battery is too low */
    + if (bat_status & BIT_BAT_STATUS_LOW) {
    + info->battery_status = APM_BATTERY_STATUS_LOW;
    + info->battery_flag = APM_BATTERY_FLAG_LOW;
    + if (info->battery_life <= APM_CRITICAL) {
    + /* we should power off the system now */
    + info->battery_status =
    + APM_BATTERY_STATUS_CRITICAL;
    + info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
    + }
    + } else {
    + /* assume the battery is high enough. */
    + info->battery_status = APM_BATTERY_STATUS_HIGH;
    + info->battery_flag = APM_BATTERY_FLAG_HIGH;
    + }
    + }
    + info->time = ((info->battery_life - 3) * 54 + 142) / 60;
    +}
    +
    +static int yeeloong_battery_init(void)
    +{
    + get_fixed_battery_info();
    +
    + apm_get_power_status = get_power_status;
    +
    + return 0;
    +}
    +
    +static void yeeloong_battery_exit(void)
    +{
    + if (apm_get_power_status == get_power_status)
    + apm_get_power_status = NULL;
    +}
    +
    static struct platform_device_id platform_device_ids[] = {
    {
    .name = "yeeloong_laptop",
    @@ -122,11 +223,14 @@ static int __init yeeloong_init(void)
    return ret;
    }

    + yeeloong_battery_init();
    +
    return 0;
    }

    static void __exit yeeloong_exit(void)
    {
    + yeeloong_battery_exit();
    yeeloong_backlight_exit();
    platform_driver_unregister(&platform_driver);

    @@ -136,6 +240,6 @@ static void __exit yeeloong_exit(void)
    module_init(yeeloong_init);
    module_exit(yeeloong_exit);

    -MODULE_AUTHOR("Wu Zhangjin <wuzj@lemote.com>");
    +MODULE_AUTHOR("Wu Zhangjin <wuzj@lemote.com>; Liu Junliang <liujl@lemote.com>");
    MODULE_DESCRIPTION("YeeLoong laptop driver");
    MODULE_LICENSE("GPL");
    --
    1.6.2.1


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