power: add driver for battery reading on iPaq h3xxx
authorDmitry Artamonow <mad_soft@inbox.ru>
Thu, 24 Jul 2014 14:00:32 +0000 (16:00 +0200)
committerSebastian Reichel <sre@kernel.org>
Thu, 24 Jul 2014 14:20:17 +0000 (16:20 +0200)
This adds a driver for reading the battery status of the
battery connected to the Atmel microcontroller on the
iPAQ h3xxx series.

Based on a driver from handhelds.org 2.6.21 kernel, written
by Alessandro GARDICH.

Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
drivers/power/Kconfig
drivers/power/Makefile
drivers/power/ipaq_micro_battery.c [new file with mode: 0644]

index ba6975123071984b88195d3acbce7a6d5e79d8f7..73cfcdf28a360e02a93e6a91ef47f5b54810363c 100644 (file)
@@ -137,6 +137,13 @@ config BATTERY_COLLIE
          Say Y to enable support for the battery on the Sharp Zaurus
          SL-5500 (collie) models.
 
+config BATTERY_IPAQ_MICRO
+       tristate "iPAQ Atmel Micro ASIC battery driver"
+       depends on MFD_IPAQ_MICRO
+       help
+         Choose this option if you want to monitor battery status on
+         Compaq/HP iPAQ h3100 and h3600.
+
 config BATTERY_WM97XX
        bool "WM97xx generic battery driver"
        depends on TOUCHSCREEN_WM97XX=y
index ee54a3e4c90ac63970715c9bf8491d3041041f69..dfa89427392636edbf39854c435f184fb37f4c24 100644 (file)
@@ -25,6 +25,7 @@ obj-$(CONFIG_BATTERY_PMU)     += pmu_battery.o
 obj-$(CONFIG_BATTERY_OLPC)     += olpc_battery.o
 obj-$(CONFIG_BATTERY_TOSA)     += tosa_battery.o
 obj-$(CONFIG_BATTERY_COLLIE)   += collie_battery.o
+obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o
 obj-$(CONFIG_BATTERY_WM97XX)   += wm97xx_battery.o
 obj-$(CONFIG_BATTERY_SBS)      += sbs-battery.o
 obj-$(CONFIG_BATTERY_BQ27x00)  += bq27x00_battery.o
diff --git a/drivers/power/ipaq_micro_battery.c b/drivers/power/ipaq_micro_battery.c
new file mode 100644 (file)
index 0000000..54632ea
--- /dev/null
@@ -0,0 +1,290 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * h3xxx atmel micro companion support, battery subdevice
+ * based on previous kernel 2.4 version
+ * Author : Alessandro Gardich <gremlin@gremlin.it>
+ * Author : Linus Walleij <linus.walleij@linaro.org>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ipaq-micro.h>
+#include <linux/power_supply.h>
+#include <linux/workqueue.h>
+
+#define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
+
+#define MICRO_BATT_CHEM_ALKALINE       0x01
+#define MICRO_BATT_CHEM_NICD           0x02
+#define MICRO_BATT_CHEM_NIMH           0x03
+#define MICRO_BATT_CHEM_LION           0x04
+#define MICRO_BATT_CHEM_LIPOLY         0x05
+#define MICRO_BATT_CHEM_NOT_INSTALLED  0x06
+#define MICRO_BATT_CHEM_UNKNOWN                0xff
+
+#define MICRO_BATT_STATUS_HIGH         0x01
+#define MICRO_BATT_STATUS_LOW          0x02
+#define MICRO_BATT_STATUS_CRITICAL     0x04
+#define MICRO_BATT_STATUS_CHARGING     0x08
+#define MICRO_BATT_STATUS_CHARGEMAIN   0x10
+#define MICRO_BATT_STATUS_DEAD         0x20 /* Battery will not charge */
+#define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */
+#define MICRO_BATT_STATUS_FULL         0x40 /* Battery fully charged */
+#define MICRO_BATT_STATUS_NOBATTERY    0x80
+#define MICRO_BATT_STATUS_UNKNOWN      0xff
+
+struct micro_battery {
+       struct ipaq_micro *micro;
+       struct workqueue_struct *wq;
+       struct delayed_work update;
+       u8 ac;
+       u8 chemistry;
+       unsigned int voltage;
+       u16 temperature;
+       u8 flag;
+};
+
+static void micro_battery_work(struct work_struct *work)
+{
+       struct micro_battery *mb = container_of(work,
+                               struct micro_battery, update.work);
+       struct ipaq_micro_msg msg_battery = {
+               .id = MSG_BATTERY,
+       };
+       struct ipaq_micro_msg msg_sensor = {
+               .id = MSG_THERMAL_SENSOR,
+       };
+
+       /* First send battery message */
+       ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
+       if (msg_battery.rx_len < 4)
+               pr_info("ERROR");
+
+       /*
+        * Returned message format:
+        * byte 0:   0x00 = Not plugged in
+        *           0x01 = AC adapter plugged in
+        * byte 1:   chemistry
+        * byte 2:   voltage LSB
+        * byte 3:   voltage MSB
+        * byte 4:   flags
+        * byte 5-9: same for battery 2
+        */
+       mb->ac = msg_battery.rx_data[0];
+       mb->chemistry = msg_battery.rx_data[1];
+       mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
+                       msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
+       mb->flag = msg_battery.rx_data[4];
+
+       if (msg_battery.rx_len == 9)
+               pr_debug("second battery ignored\n");
+
+       /* Then read the sensor */
+       ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
+       mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
+
+       queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
+}
+
+static int get_capacity(struct power_supply *b)
+{
+       struct micro_battery *mb = dev_get_drvdata(b->dev->parent);
+
+       switch (mb->flag & 0x07) {
+       case MICRO_BATT_STATUS_HIGH:
+               return 100;
+               break;
+       case MICRO_BATT_STATUS_LOW:
+               return 50;
+               break;
+       case MICRO_BATT_STATUS_CRITICAL:
+               return 5;
+               break;
+       default:
+               break;
+       }
+       return 0;
+}
+
+static int get_status(struct power_supply *b)
+{
+       struct micro_battery *mb = dev_get_drvdata(b->dev->parent);
+
+       if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
+               return POWER_SUPPLY_STATUS_UNKNOWN;
+
+       if (mb->flag & MICRO_BATT_STATUS_FULL)
+               return POWER_SUPPLY_STATUS_FULL;
+
+       if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
+               (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
+               return POWER_SUPPLY_STATUS_CHARGING;
+
+       return POWER_SUPPLY_STATUS_DISCHARGING;
+}
+
+static int micro_batt_get_property(struct power_supply *b,
+                                       enum power_supply_property psp,
+                                       union power_supply_propval *val)
+{
+       struct micro_battery *mb = dev_get_drvdata(b->dev->parent);
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_TECHNOLOGY:
+               switch (mb->chemistry) {
+               case MICRO_BATT_CHEM_NICD:
+                       val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
+                       break;
+               case MICRO_BATT_CHEM_NIMH:
+                       val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
+                       break;
+               case MICRO_BATT_CHEM_LION:
+                       val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+                       break;
+               case MICRO_BATT_CHEM_LIPOLY:
+                       val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
+                       break;
+               default:
+                       val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+                       break;
+               };
+               break;
+       case POWER_SUPPLY_PROP_STATUS:
+               val->intval = get_status(b);
+               break;
+       case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+               val->intval = 4700000;
+               break;
+       case POWER_SUPPLY_PROP_CAPACITY:
+               val->intval = get_capacity(b);
+               break;
+       case POWER_SUPPLY_PROP_TEMP:
+               val->intval = mb->temperature;
+               break;
+       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+               val->intval = mb->voltage;
+               break;
+       default:
+               return -EINVAL;
+       };
+
+       return 0;
+}
+
+static int micro_ac_get_property(struct power_supply *b,
+                                enum power_supply_property psp,
+                                union power_supply_propval *val)
+{
+       struct micro_battery *mb = dev_get_drvdata(b->dev->parent);
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_ONLINE:
+               val->intval = mb->ac;
+               break;
+       default:
+               return -EINVAL;
+       };
+
+       return 0;
+}
+
+static enum power_supply_property micro_batt_power_props[] = {
+       POWER_SUPPLY_PROP_TECHNOLOGY,
+       POWER_SUPPLY_PROP_STATUS,
+       POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+       POWER_SUPPLY_PROP_CAPACITY,
+       POWER_SUPPLY_PROP_TEMP,
+       POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static struct power_supply micro_batt_power = {
+       .name                   = "main-battery",
+       .type                   = POWER_SUPPLY_TYPE_BATTERY,
+       .properties             = micro_batt_power_props,
+       .num_properties         = ARRAY_SIZE(micro_batt_power_props),
+       .get_property           = micro_batt_get_property,
+       .use_for_apm            = 1,
+};
+
+static enum power_supply_property micro_ac_power_props[] = {
+       POWER_SUPPLY_PROP_ONLINE,
+};
+
+static struct power_supply micro_ac_power = {
+       .name                   = "ac",
+       .type                   = POWER_SUPPLY_TYPE_MAINS,
+       .properties             = micro_ac_power_props,
+       .num_properties         = ARRAY_SIZE(micro_ac_power_props),
+       .get_property           = micro_ac_get_property,
+};
+
+static int micro_batt_probe(struct platform_device *pdev)
+{
+       struct micro_battery *mb;
+
+       mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
+       if (!mb)
+               return -ENOMEM;
+
+       mb->micro = dev_get_drvdata(pdev->dev.parent);
+       mb->wq = create_singlethread_workqueue("ipaq-battery-wq");
+       INIT_DELAYED_WORK(&mb->update, micro_battery_work);
+       platform_set_drvdata(pdev, mb);
+       queue_delayed_work(mb->wq, &mb->update, 1);
+       power_supply_register(&pdev->dev, &micro_batt_power);
+       power_supply_register(&pdev->dev, &micro_ac_power);
+
+       dev_info(&pdev->dev, "iPAQ micro battery driver\n");
+       return 0;
+}
+
+static int micro_batt_remove(struct platform_device *pdev)
+
+{
+       struct micro_battery *mb = platform_get_drvdata(pdev);
+
+       power_supply_unregister(&micro_ac_power);
+       power_supply_unregister(&micro_batt_power);
+       cancel_delayed_work_sync(&mb->update);
+
+       return 0;
+}
+
+static int micro_batt_suspend(struct device *dev)
+{
+       struct micro_battery *mb = dev_get_drvdata(dev);
+
+       cancel_delayed_work_sync(&mb->update);
+       return 0;
+}
+
+static int micro_batt_resume(struct device *dev)
+{
+       struct micro_battery *mb = dev_get_drvdata(dev);
+
+       queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
+       return 0;
+}
+
+static const struct dev_pm_ops micro_batt_dev_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
+};
+
+struct platform_driver micro_batt_device_driver = {
+       .driver         = {
+               .name   = "ipaq-micro-battery",
+               .pm     = &micro_batt_dev_pm_ops,
+       },
+       .probe          = micro_batt_probe,
+       .remove         = micro_batt_remove,
+};
+module_platform_driver(micro_batt_device_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
+MODULE_ALIAS("platform:battery-ipaq-micro");