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Subject[PATCH v7 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 | 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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