summaryrefslogtreecommitdiffstats
path: root/arch/sh/boards/hp6xx/hp6xx_apm.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/boards/hp6xx/hp6xx_apm.c')
-rw-r--r--arch/sh/boards/hp6xx/hp6xx_apm.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/sh/boards/hp6xx/hp6xx_apm.c b/arch/sh/boards/hp6xx/hp6xx_apm.c
new file mode 100644
index 0000000..ad0e712
--- /dev/null
+++ b/arch/sh/boards/hp6xx/hp6xx_apm.c
@@ -0,0 +1,123 @@
+/*
+ * bios-less APM driver for hp680
+ *
+ * Copyright 2005 (c) Andriy Skulysh <askulysh@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/config.h>
+#include <linux/module.h>
+#include <linux/apm_bios.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/io.h>
+#include <asm/apm.h>
+#include <asm/adc.h>
+#include <asm/hp6xx/hp6xx.h>
+
+#define SH7709_PGDR 0xa400012c
+
+#define APM_CRITICAL 10
+#define APM_LOW 30
+
+#define HP680_BATTERY_MAX 875
+#define HP680_BATTERY_MIN 600
+#define HP680_BATTERY_AC_ON 900
+
+#define MODNAME "hp6x0_apm"
+
+static int hp6x0_apm_get_info(char *buf, char **start, off_t fpos, int length)
+{
+ u8 pgdr;
+ char *p;
+ int battery_status;
+ int battery_flag;
+ int ac_line_status;
+ int time_units = APM_BATTERY_LIFE_UNKNOWN;
+
+ int battery = adc_single(ADC_CHANNEL_BATTERY);
+ int backup = adc_single(ADC_CHANNEL_BACKUP);
+ int charging = adc_single(ADC_CHANNEL_CHARGE);
+ int percentage;
+
+ percentage = 100 * (battery - HP680_BATTERY_MIN) /
+ (HP680_BATTERY_MAX - HP680_BATTERY_MIN);
+
+ ac_line_status = (battery > HP680_BATTERY_AC_ON) ?
+ APM_AC_ONLINE : APM_AC_OFFLINE;
+
+ p = buf;
+
+ pgdr = ctrl_inb(SH7709_PGDR);
+ if (pgdr & PGDR_MAIN_BATTERY_OUT) {
+ battery_status = APM_BATTERY_STATUS_NOT_PRESENT;
+ battery_flag = 0x80;
+ percentage = -1;
+ } else if (charging < 8 ) {
+ battery_status = APM_BATTERY_STATUS_CHARGING;
+ battery_flag = 0x08;
+ ac_line_status = 0xff;
+ } else if (percentage <= APM_CRITICAL) {
+ battery_status = APM_BATTERY_STATUS_CRITICAL;
+ battery_flag = 0x04;
+ } else if (percentage <= APM_LOW) {
+ battery_status = APM_BATTERY_STATUS_LOW;
+ battery_flag = 0x02;
+ } else {
+ battery_status = APM_BATTERY_STATUS_HIGH;
+ battery_flag = 0x01;
+ }
+
+ p += sprintf(p, "1.0 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
+ APM_32_BIT_SUPPORT,
+ ac_line_status,
+ battery_status,
+ battery_flag,
+ percentage,
+ time_units,
+ "min");
+ p += sprintf(p, "bat=%d backup=%d charge=%d\n",
+ battery, backup, charging);
+
+ return p - buf;
+}
+
+static irqreturn_t hp6x0_apm_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+ if (!apm_suspended)
+ 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,
+ SA_INTERRUPT, MODNAME, 0);
+ if (unlikely(ret < 0)) {
+ printk(KERN_ERR MODNAME ": IRQ %d request failed\n",
+ HP680_BTN_IRQ);
+ return ret;
+ }
+
+ apm_get_info = hp6x0_apm_get_info;
+
+ return ret;
+}
+
+static void __exit hp6x0_apm_exit(void)
+{
+ free_irq(HP680_BTN_IRQ, 0);
+ apm_get_info = 0;
+}
+
+module_init(hp6x0_apm_init);
+module_exit(hp6x0_apm_exit);
+
+MODULE_AUTHOR("Adriy Skulysh");
+MODULE_DESCRIPTION("hp6xx Advanced Power Management");
+MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud