[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>

1 files changed, 278 insertions, 0 deletions

diff --git a/arch/arm/mach-sa1100/collie_pm.c b/arch/arm/mach-sa1100/collie_pm.c
new file mode 100644
index 000000000000..696d7d29c8a5
--- /dev/null
+++ b/arch/arm/mach-sa1100/collie_pm.c
@@ -0,0 +1,278 @@
+/*
+ * 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);