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[PATCH v7 4/8] Loongson: YeeLoong: add battery driver

To: Ralf Baechle <ralf@linux-mips.org>, akpm@linux-foundation.org, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 4/8] Loongson: YeeLoong: add battery driver
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Fri, 4 Dec 2009 21:34:17 +0800
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>, Pavel Machek <pavel@ucw.cz>, "Rafael J. Wysocki" <rjw@sisk.pl>, zhangfx@lemote.com, Stephen Rothwell <sfr@canb.auug.org.au>, linux-laptop@vger.kernel.org, Wu Zhangjin <wuzhangjin@gmail.com>
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In-reply-to: <cover.1259932036.git.wuzhangjin@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <cover.1259932036.git.wuzhangjin@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
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 |  104 +++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index f7a3705..0c6b5ad 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
        default m
        help
          YeeLoong netbook is a mini laptop made by Lemote, which is basically
diff --git a/drivers/platform/mips/yeeloong_laptop.c 
b/drivers/platform/mips/yeeloong_laptop.c
index fbc4ebb..729e368 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -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>
 
@@ -83,6 +84,106 @@ 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",
@@ -120,11 +221,14 @@ 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);
 
-- 
1.6.2.1


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