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Diffstat (limited to 'arch/sh/boards/mach-hp6xx/hp6xx_apm.c')
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diff --git a/arch/sh/boards/mach-hp6xx/hp6xx_apm.c b/arch/sh/boards/mach-hp6xx/hp6xx_apm.c
new file mode 100644
index 00000000000..177f4f028e0
--- /dev/null
+++ b/arch/sh/boards/mach-hp6xx/hp6xx_apm.c
@@ -0,0 +1,111 @@
+/*
+ * bios-less APM driver for hp680
+ *
+ * Copyright 2005 (c) Andriy Skulysh <askulysh@gmail.com>
+ * Copyright 2008 (c) Kristoffer Ericson <kristoffer.ericson@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/apm-emulation.h>
+#include <linux/io.h>
+#include <asm/adc.h>
+#include <asm/hp6xx.h>
+
+/* percentage values */
+#define APM_CRITICAL 10
+#define APM_LOW 30
+
+/* resonably sane values */
+#define HP680_BATTERY_MAX 898
+#define HP680_BATTERY_MIN 486
+#define HP680_BATTERY_AC_ON 1023
+
+#define MODNAME "hp6x0_apm"
+
+#define PGDR 0xa400012c
+
+static void hp6x0_apm_get_power_status(struct apm_power_info *info)
+{
+ int battery, backup, charging, percentage;
+ u8 pgdr;
+
+ battery = adc_single(ADC_CHANNEL_BATTERY);
+ backup = adc_single(ADC_CHANNEL_BACKUP);
+ charging = adc_single(ADC_CHANNEL_CHARGE);
+
+ percentage = 100 * (battery - HP680_BATTERY_MIN) /
+ (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
+
+ /* % of full battery */
+ info->battery_life = percentage;
+
+ /* We want our estimates in minutes */
+ info->units = 0;
+
+ /* Extremely(!!) rough estimate, we will replace this with a datalist later on */
+ info->time = (2 * battery);
+
+ info->ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
+ APM_AC_ONLINE : APM_AC_OFFLINE;
+
+ pgdr = ctrl_inb(PGDR);
+ if (pgdr & PGDR_MAIN_BATTERY_OUT) {
+ info->battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
+ info->battery_flag = 0x80;
+ } else if (charging < 8) {
+ info->battery_status = APM_BATTERY_STATUS_CHARGING;
+ info->battery_flag = 0x08;
+ info->ac_line_status = 0x01;
+ } else if (percentage <= APM_CRITICAL) {
+ info->battery_status = APM_BATTERY_STATUS_CRITICAL;
+ info->battery_flag = 0x04;
+ } else if (percentage <= APM_LOW) {
+ info->battery_status = APM_BATTERY_STATUS_LOW;
+ info->battery_flag = 0x02;
+ } else {
+ info->battery_status = APM_BATTERY_STATUS_HIGH;
+ info->battery_flag = 0x01;
+ }
+}
+
+static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev)
+{
+ if (!APM_DISABLED)
+ apm_queue_event(APM_USER_SUSPEND);
+
+ return IRQ_HANDLED;
+}
+
+static int __init hp6x0_apm_init(void)
+{
+ int ret;
+
+ ret = request_irq(HP680_BTN_IRQ, hp6x0_apm_interrupt,
+ IRQF_DISABLED, MODNAME, NULL);
+ if (unlikely(ret < 0)) {
+ printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
+ HP680_BTN_IRQ);
+ return ret;
+ }
+
+ apm_get_power_status = hp6x0_apm_get_power_status;
+
+ return ret;
+}
+
+static void __exit hp6x0_apm_exit(void)
+{
+ free_irq(HP680_BTN_IRQ, 0);
+}
+
+module_init(hp6x0_apm_init);
+module_exit(hp6x0_apm_exit);
+
+MODULE_AUTHOR("Adriy Skulysh");
+MODULE_DESCRIPTION("hp6xx Advanced Power Management");
+MODULE_LICENSE("GPL");