1 files changed, 111 insertions, 0 deletions

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 000000000000..177f4f028e0d
--- /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");