[ARM] 3385/1: Battery support for sharp zaurus sl-5500 (collie)

Patch from Pavel Machek

This adds support for battery reading on collie. Collie slowly charges
battery even with charging disabled, so I did not yet enable fast
charge.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/collie_pm.c

+/*
+ * Based on spitz_pm.c and sharp code.
+ *
+ * Copyright (C) 2001  SHARP
+ * Copyright 2005 Pavel Machek <pavel@suse.cz>
+ *
+ * Distribute under GPLv2.
+ *
+ * Li-ion batteries are angry beasts, and they like to explode. This driver is not finished,
+ * and sometimes charges them when it should not. If it makes angry lithium to come your way...
+ * ...well, you have been warned.
+ */
+
+#include <linux/module.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+#include <asm/hardware/scoop.h>
+#include <asm/dma.h>
+#include <asm/arch/collie.h>
+#include <asm/mach/sharpsl_param.h>
+#include <asm/hardware/sharpsl_pm.h>
+
+#include "../drivers/mfd/ucb1x00.h"
+
+static struct ucb1x00 *ucb;
+static int ad_revise;
+
+#define ADCtoPower(x)	       ((330 * x * 2) / 1024)
+
+static void collie_charger_init(void)
+{
+	int err;
+
+	if (sharpsl_param.adadj != -1) {
+		ad_revise = sharpsl_param.adadj;
+	}
+
+	/* Register interrupt handler. */
+	if ((err = request_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr, SA_INTERRUPT,
+			       "ACIN", sharpsl_ac_isr))) {
+		printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_AC_IN);
+		return;
+	}
+	if ((err = request_irq(COLLIE_IRQ_GPIO_CO, sharpsl_chrg_full_isr, SA_INTERRUPT,
+			       "CO", sharpsl_chrg_full_isr))) {
+		free_irq(COLLIE_IRQ_GPIO_AC_IN, sharpsl_ac_isr);
+		printk("Could not get irq %d.\n", COLLIE_IRQ_GPIO_CO);
+		return;
+	}
+
+	ucb1x00_io_set_dir(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON | COLLIE_TC35143_GPIO_TMP_ON |
+			           COLLIE_TC35143_GPIO_BBAT_ON);
+	return;
+}
+
+static void collie_measure_temp(int on)
+{
+	if (on)
+		ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
+	else
+		ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
+}
+
+static void collie_charge(int on)
+{
+	if (on) {
+		printk("Should start charger\n");
+	} else {
+		printk("Should stop charger\n");
+	}
+#ifdef I_AM_SURE
+
+	/* Zaurus seems to contain LTC1731 ; it should know when to
+	 * stop charging itself, so setting charge on should be
+	 * relatively harmless (as long as it is not done too often).
+	 */
+#define CF_BUF_CTRL_BASE 0xF0800000
+#define        SCOOP_REG(adr) (*(volatile unsigned short*)(CF_BUF_CTRL_BASE+(adr)))
+#define        SCOOP_REG_GPWR    SCOOP_REG(SCOOP_GPWR)
+
+	if (on) {
+		set_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
+	} else {
+		reset_scoop_gpio(&colliescoop_device.dev, COLLIE_SCP_CHARGE_ON);
+	}
+#endif
+}
+
+static void collie_discharge(int on)
+{
+}
+
+static void collie_discharge1(int on)
+{
+}
+
+static void collie_presuspend(void)
+{
+}
+
+static void collie_postsuspend(void)
+{
+}
+
+static int collie_should_wakeup(unsigned int resume_on_alarm)
+{
+	return 0;
+}
+
+static unsigned long collie_charger_wakeup(void)
+{
+	return 0;
+}
+
+int collie_read_backup_battery(void)
+{
+	int voltage;
+
+	ucb1x00_adc_enable(ucb);
+
+	/* Gives 75..130 */
+	ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_BBAT_ON, 0);
+	voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
+
+	ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
+	ucb1x00_adc_disable(ucb);
+
+	printk("Backup battery = %d(%d)\n", ADCtoPower(voltage), voltage);
+
+	return ADCtoPower(voltage);
+}
+
+int collie_read_main_battery(void)
+{
+	int voltage, voltage_rev, voltage_volts;
+
+	ucb1x00_adc_enable(ucb);
+	ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_BBAT_ON);
+	ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_MBAT_ON, 0);
+	/* gives values 160..255 with battery removed... and
+	   145..255 with battery inserted. (on AC), goes as low as
+	   80 on DC. */
+	voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD1, UCB_SYNC);
+
+	ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_MBAT_ON);
+	ucb1x00_adc_disable(ucb);
+
+	voltage_rev = voltage + ((ad_revise * voltage) / 652);
+	voltage_volts = ADCtoPower(voltage_rev);
+
+	printk("Main battery = %d(%d)\n", voltage_volts, voltage);
+
+	if (voltage != -1)
+		return voltage_volts;
+	else
+		return voltage;
+}
+
+int collie_read_temp(void)
+{
+	int voltage;
+
+	/* According to Sharp, temp must be > 973, main battery must be < 465,
+	   FIXME: sharpsl_pm.c has both conditions negated? FIXME: values
+	   are way out of range? */
+
+	ucb1x00_adc_enable(ucb);
+	ucb1x00_io_write(ucb, COLLIE_TC35143_GPIO_TMP_ON, 0);
+	/* >1010 = battery removed, 460 = 22C ?, higer = lower temp ? */
+	voltage = ucb1x00_adc_read(ucb, UCB_ADC_INP_AD0, UCB_SYNC);
+	ucb1x00_io_write(ucb, 0, COLLIE_TC35143_GPIO_TMP_ON);
+	ucb1x00_adc_disable(ucb);
+
+	printk("Battery temp = %d\n", voltage);
+	return voltage;
+}
+
+static unsigned long read_devdata(int which)
+{
+	switch (which) {
+	case SHARPSL_BATT_VOLT:
+		return collie_read_main_battery();
+	case SHARPSL_BATT_TEMP:
+		return collie_read_temp();
+	case SHARPSL_ACIN_VOLT:
+		return 0x1;
+	case SHARPSL_STATUS_ACIN: {
+		int ret = GPLR & COLLIE_GPIO_AC_IN;
+		printk("AC status = %d\n", ret);
+		return ret;
+	}
+	case SHARPSL_STATUS_FATAL: {
+		int ret = GPLR & COLLIE_GPIO_MAIN_BAT_LOW;
+		printk("Fatal bat = %d\n", ret);
+		return ret;
+	}
+	default:
+		return ~0;
+	}
+}
+
+struct battery_thresh collie_battery_levels[] = {
+	{ 368, 100},
+	{ 358,  25},
+	{ 356,   5},
+	{   0,   0},
+};
+
+struct sharpsl_charger_machinfo collie_pm_machinfo = {
+	.init             = collie_charger_init,
+	.read_devdata	  = read_devdata,
+	.discharge        = collie_discharge,
+	.discharge1       = collie_discharge1,
+	.charge           = collie_charge,
+	.measure_temp     = collie_measure_temp,
+	.presuspend       = collie_presuspend,
+	.postsuspend      = collie_postsuspend,
+	.charger_wakeup   = collie_charger_wakeup,
+	.should_wakeup    = collie_should_wakeup,
+	.bat_levels       = 3,
+	.bat_levels_noac  = collie_battery_levels,
+	.bat_levels_acin  = collie_battery_levels,
+	.status_high_acin = 368,
+	.status_low_acin  = 358,
+	.status_high_noac = 368,
+	.status_low_noac  = 358,
+};
+
+static int __init collie_pm_ucb_add(struct ucb1x00_dev *pdev)
+{
+	sharpsl_pm.machinfo = &collie_pm_machinfo;
+	ucb = pdev->ucb;
+	return 0;
+}
+
+static struct ucb1x00_driver collie_pm_ucb_driver = {
+	.add            = collie_pm_ucb_add,
+};
+
+static struct platform_device *collie_pm_device;
+
+static int __init collie_pm_init(void)
+{
+        int ret;
+
+        collie_pm_device = platform_device_alloc("sharpsl-pm", -1);
+        if (!collie_pm_device)
+                return -ENOMEM;
+
+        collie_pm_device->dev.platform_data = &collie_pm_machinfo;
+        ret = platform_device_add(collie_pm_device);
+
+        if (ret)
+                platform_device_put(collie_pm_device);
+
+	if (!ret)
+		ret = ucb1x00_register_driver(&collie_pm_ucb_driver);
+
+	return ret;
+}
+
+static void __exit collie_pm_exit(void)
+{
+	ucb1x00_unregister_driver(&collie_pm_ucb_driver);
+        platform_device_unregister(collie_pm_device);
+}
+
+module_init(collie_pm_init);
+module_exit(collie_pm_exit);