bq27000-battery-driver.patch
authormokopatches <mokopatches@openmoko.org>
Wed, 19 Nov 2008 17:03:18 +0000 (17:03 +0000)
committerwarmcat <andy@warmcat.com>
Wed, 19 Nov 2008 17:03:18 +0000 (17:03 +0000)
arch/arm/mach-s3c2440/Kconfig
arch/arm/mach-s3c2440/mach-gta02.c
drivers/power/Kconfig
drivers/power/Makefile
drivers/power/bq27000_battery.c [new file with mode: 0644]
include/linux/bq27000_battery.h [new file with mode: 0644]

index ed3f2cd..cbcf9fc 100644 (file)
@@ -87,6 +87,8 @@ config MACH_NEO1973_GTA02
        bool "FIC Neo1973 GSM Phone (GTA02 Hardware)"
        select CPU_S3C2442
        select SENSORS_PCF50633
+       select POWER_SUPPLY
+       select GTA02_HDQ
        help
           Say Y here if you are using the FIC Neo1973 GSM Phone
 
index cea76e7..3816ea5 100644 (file)
@@ -81,6 +81,8 @@
 
 #include <asm/arch/fiq_ipc_gta02.h>
 #include "fiq_c_isr.h"
+#include <linux/gta02_hdq.h>
+#include <linux/bq27000_battery.h>
 
 /* arbitrates which sensor IRQ owns the shared SPI bus */
 static spinlock_t motion_irq_lock;
@@ -583,6 +585,24 @@ struct platform_device gta02_hdq_device = {
 };
 #endif
 
+/* BQ27000 Battery */
+
+struct bq27000_platform_data bq27000_pdata = {
+       .name = "bat",
+       .rsense_mohms = 20,
+       .hdq_read = gta02hdq_read,
+       .hdq_write = gta02hdq_write,
+       .hdq_initialized = gta02hdq_initialized,
+};
+
+struct platform_device bq27000_battery_device = {
+       .name           = "bq27000-battery",
+       .dev = {
+               .platform_data = &bq27000_pdata,
+       },
+};
+
+
 /* NOR Flash */
 
 #define GTA02_FLASH_BASE       0x18000000 /* GCS3 */
@@ -1271,6 +1291,7 @@ static void __init gta02_machine_init(void)
        case GTA02v5_SYSTEM_REV:
        case GTA02v6_SYSTEM_REV:
                platform_device_register(&gta02_hdq_device);
+               platform_device_register(&bq27000_battery_device);
                break;
        default:
                break;
index a490b3d..8b1d09a 100644 (file)
@@ -68,7 +68,10 @@ config BATTERY_BQ27x00
        help
          Say Y here to enable support for batteries with BQ27200(I2C) chip.
 
-endif # POWER_SUPPLY
+config BATTERY_BQ27000_HDQ
+       tristate "BQ27000 HDQ battery monitor driver"
+       help
+         Say Y to enable support for the battery on the Neo Freerunner
 
 config GTA02_HDQ
        tristate "Neo Freerunner HDQ"
@@ -77,3 +80,5 @@ config GTA02_HDQ
          Say Y to enable support for communicating with an HDQ battery
          on the Neo Freerunner.  You probably want to select
          at least BATTERY_BQ27000_HDQ as well
+
+endif # POWER_SUPPLY
index 1b21ce5..56f3901 100644 (file)
@@ -24,5 +24,6 @@ obj-$(CONFIG_BATTERY_TOSA)    += tosa_battery.o
 obj-$(CONFIG_BATTERY_WM97XX)   += wm97xx_battery.o
 obj-$(CONFIG_BATTERY_BQ27x00)  += bq27x00_battery.o
 obj-$(CONFIG_BATTERY_PALMTX)   += palmtx_battery.o
+obj-$(CONFIG_BATTERY_BQ27000_HDQ)      += bq27000_battery.o
 
 obj-$(CONFIG_GTA02_HDQ)                += gta02_hdq.o
diff --git a/drivers/power/bq27000_battery.c b/drivers/power/bq27000_battery.c
new file mode 100644 (file)
index 0000000..d19186a
--- /dev/null
@@ -0,0 +1,375 @@
+/*
+ * Driver for batteries with bq27000 chips inside via HDQ
+ *
+ * Copyright 2008 Openmoko, Inc
+ * Andy Green <andy@openmoko.com>
+ *
+ * based on ds2760 driver, original copyright notice for that --->
+ *
+ * Copyright © 2007 Anton Vorontsov
+ *            2004-2007 Matt Reimer
+ *            2004 Szabolcs Gyurko
+ *
+ * Use consistent with the GNU GPL is permitted,
+ * provided that this copyright notice is
+ * preserved in its entirety in all copies and derived works.
+ *
+ * Author:  Anton Vorontsov <cbou@mail.ru>
+ *         February 2007
+ *
+ *         Matt Reimer <mreimer@vpop.net>
+ *         April 2004, 2005, 2007
+ *
+ *         Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
+ *         September 2004
+ */
+
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/jiffies.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/bq27000_battery.h>
+
+enum bq27000_regs {
+       /* RAM regs */
+               /* read-write after this */
+       BQ27000_CTRL = 0, /* Device Control Register */
+       BQ27000_MODE, /* Device Mode Register */
+       BQ27000_AR_L, /* At-Rate H L */
+       BQ27000_AR_H,
+               /* read-only after this */
+       BQ27000_ARTTE_L, /* At-Rate Time To Empty H L */
+       BQ27000_ARTTE_H,
+       BQ27000_TEMP_L, /* Reported Temperature H L */
+       BQ27000_TEMP_H,
+       BQ27000_VOLT_L, /* Reported Voltage H L */
+       BQ27000_VOLT_H,
+       BQ27000_FLAGS, /* Status Flags */
+       BQ27000_RSOC, /* Relative State of Charge */
+       BQ27000_NAC_L, /* Nominal Available Capacity H L */
+       BQ27000_NAC_H,
+       BQ27000_CACD_L, /* Discharge Compensated H L */
+       BQ27000_CACD_H,
+       BQ27000_CACT_L, /* Temperature Compensated H L */
+       BQ27000_CACT_H,
+       BQ27000_LMD_L, /* Last measured discharge H L */
+       BQ27000_LMD_H,
+       BQ27000_AI_L, /* Average Current H L */
+       BQ27000_AI_H,
+       BQ27000_TTE_L, /* Time to Empty H L */
+       BQ27000_TTE_H,
+       BQ27000_TTF_L, /* Time to Full H L */
+       BQ27000_TTF_H,
+       BQ27000_SI_L, /* Standby Current H L */
+       BQ27000_SI_H,
+       BQ27000_STTE_L, /* Standby Time To Empty H L */
+       BQ27000_STTE_H,
+       BQ27000_MLI_L, /* Max Load Current H L */
+       BQ27000_MLI_H,
+       BQ27000_MLTTE_L, /* Max Load Time To Empty H L */
+       BQ27000_MLTTE_H,
+       BQ27000_SAE_L, /* Available Energy H L */
+       BQ27000_SAE_H,
+       BQ27000_AP_L, /* Available Power H L */
+       BQ27000_AP_H,
+       BQ27000_TTECP_L, /* Time to Empty at Constant Power H L */
+       BQ27000_TTECP_H,
+       BQ27000_CYCL_L, /* Cycle count since learning cycle H L */
+       BQ27000_CYCL_H,
+       BQ27000_CYCT_L, /* Cycle Count Total H L */
+       BQ27000_CYCT_H,
+       BQ27000_CSOC, /* Compensated State Of Charge */
+       /* EEPROM regs */
+               /* read-write after this */
+       BQ27000_EE_EE_EN = 0x6e, /* EEPROM Program Enable */
+       BQ27000_EE_ILMD = 0x76, /* Initial Last Measured Discharge High Byte */
+       BQ27000_EE_SEDVF, /* Scaled EDVF Threshold */
+       BQ27000_EE_SEDV1, /* Scaled EDV1 Threshold */
+       BQ27000_EE_ISLC, /* Initial Standby Load Current */
+       BQ27000_EE_DMFSD, /* Digital Magnitude Filter and Self Discharge */
+       BQ27000_EE_TAPER, /* Aging Estimate Enable, Charge Termination Taper */
+       BQ27000_EE_PKCFG, /* Pack Configuration Values */
+       BQ27000_EE_IMLC, /* Initial Max Load Current or ID #3 */
+       BQ27000_EE_DCOMP, /* Discharge rate compensation constants or ID #2 */
+       BQ27000_EE_TCOMP, /* Temperature Compensation constants or ID #1 */
+};
+
+enum bq27000_status_flags {
+       BQ27000_STATUS_CHGS = 0x80, /* 1 = being charged */
+       BQ27000_STATUS_NOACT = 0x40, /* 1 = no activity */
+       BQ27000_STATUS_IMIN = 0x20, /* 1 = Lion taper current mode */
+       BQ27000_STATUS_CI = 0x10, /* 1 = capacity likely  innacurate */
+       BQ27000_STATUS_CALIP = 0x08, /* 1 = calibration in progress */
+       BQ27000_STATUS_VDQ = 0x04, /* 1 = capacity should be accurate */
+       BQ27000_STATUS_EDV1 = 0x02, /* 1 = end of discharge.. <6% left */
+       BQ27000_STATUS_EDVF = 0x01, /* 1 = no, it's really empty now */
+};
+
+#define NANOVOLTS_UNIT 3750
+
+struct bq27000_device_info {
+       struct device *dev;
+       struct power_supply bat;
+
+       int rsense_mohms;               /* from platform */
+
+       int (*hdq_initialized)(void); /* from platform */
+       int (*hdq_read)(int); /* from platform */
+       int (*hdq_write)(int, u8); /* from platform */
+};
+
+/*
+ * reading 16 bit values over HDQ has a special hazard where the
+ * hdq device firmware can update the 16-bit register during the time we
+ * read the two halves.  TI document SLUS556D recommends the algorithm here
+ * to avoid trouble
+ */
+
+static int hdq_read16(struct bq27000_device_info *di, int address)
+{
+       int acc;
+       int high;
+       int retries = 3;
+
+       while (retries--) {
+
+               high = (di->hdq_read)(address + 1); /* high part */
+
+               if (high < 0)
+                       return high;
+               acc = (di->hdq_read)(address);
+               if (acc < 0)
+                       return acc;
+
+               /* confirm high didn't change between reading it and low */
+               if (high == (di->hdq_read)(address + 1))
+                       return (high << 8) | acc;
+       }
+
+       return -ETIME;
+}
+
+#define to_bq27000_device_info(x) container_of((x), \
+                                              struct bq27000_device_info, \
+                                              bat);
+
+static void bq27000_battery_external_power_changed(struct power_supply *psy)
+{
+       struct bq27000_device_info *di = to_bq27000_device_info(psy);
+
+       dev_dbg(di->dev, "%s\n", __FUNCTION__);
+}
+
+static int bq27000_battery_get_property(struct power_supply *psy,
+                                      enum power_supply_property psp,
+                                      union power_supply_propval *val)
+{
+       int v, n;
+       struct bq27000_device_info *di = to_bq27000_device_info(psy);
+
+       if (!(di->hdq_initialized)())
+               return -EINVAL;
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_STATUS:
+               val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+               v = hdq_read16(di, BQ27000_AI_L);
+               if (v < 0)
+                       return v;
+               if (v < 2) { /* no real activity on the battery */
+                       if (!hdq_read16(di, BQ27000_TTF_L))
+                               val->intval = POWER_SUPPLY_STATUS_FULL;
+                       else
+                               val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+                       break;
+               }
+               /* power is actually going in or out... */
+               v = (di->hdq_read)(BQ27000_FLAGS);
+               if (v < 0)
+                       return v;
+               if (v & BQ27000_STATUS_CHGS)
+                       val->intval = POWER_SUPPLY_STATUS_CHARGING;
+               else
+                       val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+               break;
+       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+               v = hdq_read16(di, BQ27000_VOLT_L);
+               if (v < 0)
+                       return v;
+               val->intval = v * 1000; /* mV -> uV */
+               break;
+       case POWER_SUPPLY_PROP_CURRENT_NOW:
+               v = (di->hdq_read)(BQ27000_FLAGS);
+               if (v < 0)
+                       return v;
+               if (v & BQ27000_STATUS_CHGS)
+                       n = -NANOVOLTS_UNIT;
+               else
+                       n = NANOVOLTS_UNIT;
+               v = hdq_read16(di, BQ27000_AI_L);
+               if (v < 0)
+                       return v;
+               val->intval = (v * n) / di->rsense_mohms;
+               break;
+       case POWER_SUPPLY_PROP_CHARGE_FULL:
+               v = hdq_read16(di, BQ27000_LMD_L);
+               if (v < 0)
+                       return v;
+               val->intval = (v * 3570) / di->rsense_mohms;
+               break;
+       case POWER_SUPPLY_PROP_TEMP:
+               v = hdq_read16(di, BQ27000_TEMP_L);
+               if (v < 0)
+                       return v;
+               /* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/
+               /* 10926 = 27315 * 4 / 10 */
+               val->intval = (((long)v * 10l) - 10926) / 4;
+               break;
+       case POWER_SUPPLY_PROP_TECHNOLOGY:
+               val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+               break;
+       case POWER_SUPPLY_PROP_CAPACITY:
+               val->intval = (di->hdq_read)(BQ27000_RSOC);
+               if (val->intval < 0)
+                       return val->intval;
+               break;
+       case POWER_SUPPLY_PROP_PRESENT:
+               v = (di->hdq_read)(BQ27000_RSOC);
+               val->intval = !(v < 0);
+               break;
+       case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+               v = hdq_read16(di, BQ27000_TTE_L);
+               if (v < 0)
+                       return v;
+               val->intval = 60 * v;
+               break;
+       case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+               v = hdq_read16(di, BQ27000_TTF_L);
+               if (v < 0)
+                       return v;
+               val->intval = 60 * v;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static enum power_supply_property bq27000_battery_props[] = {
+       POWER_SUPPLY_PROP_STATUS,
+       POWER_SUPPLY_PROP_VOLTAGE_NOW,
+       POWER_SUPPLY_PROP_CURRENT_NOW,
+       POWER_SUPPLY_PROP_CHARGE_FULL,
+       POWER_SUPPLY_PROP_TEMP,
+       POWER_SUPPLY_PROP_TECHNOLOGY,
+       POWER_SUPPLY_PROP_PRESENT,
+       POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+       POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+       POWER_SUPPLY_PROP_MODEL_NAME,
+       POWER_SUPPLY_PROP_CAPACITY
+};
+
+static int bq27000_battery_probe(struct platform_device *pdev)
+{
+       int retval = 0;
+       struct bq27000_device_info *di;
+       struct bq27000_platform_data *pdata;
+
+       dev_info(&pdev->dev, "BQ27000 Battery Driver (C) 2008 Openmoko, Inc\n");
+
+       di = kzalloc(sizeof(*di), GFP_KERNEL);
+       if (!di) {
+               retval = -ENOMEM;
+               goto di_alloc_failed;
+       }
+
+       platform_set_drvdata(pdev, di);
+
+       pdata = pdev->dev.platform_data;
+       di->dev         = &pdev->dev;
+       /* di->w1_dev        = pdev->dev.parent; */
+       di->bat.name       = pdata->name;
+       di->bat.type       = POWER_SUPPLY_TYPE_BATTERY;
+       di->bat.properties     = bq27000_battery_props;
+       di->bat.num_properties = ARRAY_SIZE(bq27000_battery_props);
+       di->bat.get_property   = bq27000_battery_get_property;
+       di->bat.external_power_changed =
+                                 bq27000_battery_external_power_changed;
+       di->hdq_read = pdata->hdq_read;
+       di->hdq_write = pdata->hdq_write;
+       di->rsense_mohms = pdata->rsense_mohms;
+       di->hdq_initialized = pdata->hdq_initialized;
+
+       retval = power_supply_register(&pdev->dev, &di->bat);
+       if (retval) {
+               dev_err(di->dev, "failed to register battery\n");
+               goto batt_failed;
+       }
+
+       return 0;
+
+batt_failed:
+       kfree(di);
+di_alloc_failed:
+       return retval;
+}
+
+static int bq27000_battery_remove(struct platform_device *pdev)
+{
+       struct bq27000_device_info *di = platform_get_drvdata(pdev);
+
+       power_supply_unregister(&di->bat);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int bq27000_battery_suspend(struct platform_device *pdev,
+                                 pm_message_t state)
+{
+       return 0;
+}
+
+static int bq27000_battery_resume(struct platform_device *pdev)
+{
+       return 0;
+}
+
+#else
+
+#define bq27000_battery_suspend NULL
+#define bq27000_battery_resume NULL
+
+#endif /* CONFIG_PM */
+
+static struct platform_driver bq27000_battery_driver = {
+       .driver = {
+               .name = "bq27000-battery",
+       },
+       .probe    = bq27000_battery_probe,
+       .remove   = bq27000_battery_remove,
+       .suspend  = bq27000_battery_suspend,
+       .resume   = bq27000_battery_resume,
+};
+
+static int __init bq27000_battery_init(void)
+{
+       return platform_driver_register(&bq27000_battery_driver);
+}
+
+static void __exit bq27000_battery_exit(void)
+{
+       platform_driver_unregister(&bq27000_battery_driver);
+}
+
+module_init(bq27000_battery_init);
+module_exit(bq27000_battery_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
+MODULE_DESCRIPTION("bq27000 battery driver");
diff --git a/include/linux/bq27000_battery.h b/include/linux/bq27000_battery.h
new file mode 100644 (file)
index 0000000..36b4f20
--- /dev/null
@@ -0,0 +1,12 @@
+#ifndef __BQ27000_BATTERY_H__
+#define __BQ27000_BATTERY_H__
+
+struct bq27000_platform_data {
+       const char      *name;
+       int             rsense_mohms;
+       int (*hdq_read)(int);
+       int (*hdq_write)(int, u8);
+       int (*hdq_initialized)(void);
+};
+
+#endif