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authorLars-Peter Clausen <lars@metafoo.de>2009-09-23 14:54:06 +0200
committerLars-Peter Clausen <lars@metafoo.de>2010-05-18 00:26:38 +0200
commit8b55c798c15253224fffbb3ba7eb4a47b1219cf6 (patch)
treeed14085bf265151bb6062f75facc94f953924982 /drivers
parente40152ee1e1c7a63f4777791863215e3faa37a86 (diff)
Add hdq and bq27000 driver.
Diffstat (limited to 'drivers')
-rw-r--r--drivers/power/Kconfig12
-rw-r--r--drivers/power/Makefile3
-rw-r--r--drivers/power/bq27000_battery.c478
-rw-r--r--drivers/power/hdq.c512
4 files changed, 1005 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index faaa9b4d0d0..75ab544f903 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -131,4 +131,16 @@ config CHARGER_PCF50633
help
Say Y to include support for NXP PCF50633 Main Battery Charger.
+config BATTERY_BQ27000_HDQ
+ tristate "BQ27000 HDQ battery monitor driver"
+ help
+ Say Y to enable support for the battery on the Neo Freerunner
+
+config HDQ_GPIO_BITBANG
+ bool "Generic gpio based HDQ bitbang"
+ help
+ Say Y to enable supoort for generic gpio based HDQ bitbang driver.
+ This can not be built as a module.
+
endif # POWER_SUPPLY
+
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index a2ba7c85c97..9eef9348e18 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -32,3 +32,6 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
+obj-$(CONFIG_BATTERY_BQ27000_HDQ) += bq27000_battery.o
+
+obj-$(CONFIG_HDQ_GPIO_BITBANG) += hdq.o
diff --git a/drivers/power/bq27000_battery.c b/drivers/power/bq27000_battery.c
new file mode 100644
index 00000000000..ff5a7eff152
--- /dev/null
+++ b/drivers/power/bq27000_battery.c
@@ -0,0 +1,478 @@
+/*
+ * 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/workqueue.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/bq27000_battery.h>
+#include <linux/slab.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_bat_regs {
+ int ai;
+ int flags;
+ int lmd;
+ int rsoc;
+ int temp;
+ int tte;
+ int ttf;
+ int volt;
+};
+
+struct bq27000_device_info {
+ struct device *dev;
+ struct power_supply bat;
+ struct power_supply ac;
+ struct power_supply usb;
+ struct delayed_work work;
+ struct bq27000_platform_data *pdata;
+
+ struct bq27000_bat_regs regs;
+};
+
+static unsigned int cache_time = 5000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+
+/*
+ * 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->pdata->hdq_read)(address + 1); /* high part */
+
+ if (high < 0)
+ return high;
+ acc = (di->pdata->hdq_read)(address);
+ if (acc < 0)
+ return acc;
+
+ /* confirm high didn't change between reading it and low */
+ if (high == (di->pdata->hdq_read)(address + 1))
+ return (high << 8) | acc;
+ }
+
+ return -ETIME;
+}
+
+static void bq27000_battery_external_power_changed(struct power_supply *psy)
+{
+ struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
+
+ dev_dbg(di->dev, "%s\n", __FUNCTION__);
+ schedule_delayed_work(&di->work, 0);
+}
+
+static int bq27000_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int n;
+ struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
+
+ if (di->regs.rsoc < 0 && psp != POWER_SUPPLY_PROP_PRESENT)
+ return -ENODEV;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+
+ if (!di->pdata->get_charger_online_status)
+ goto use_bat;
+ if ((di->pdata->get_charger_online_status)()) {
+ /*
+ * charger is definitively present
+ * we report our state in terms of what it says it
+ * is doing
+ */
+ if (!di->pdata->get_charger_active_status)
+ goto use_bat;
+
+ if ((di->pdata->get_charger_active_status)()) {
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ }
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+
+ /*
+ * platform provided definite indication of charger presence,
+ * and it is telling us it isn't there... but we are on so we
+ * must be running from battery --->
+ */
+
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+
+use_bat:
+ /*
+ * either the charger is not connected, or the
+ * platform doesn't give info about charger, use battery state
+ * but... battery state can be out of date by 4 seconds or
+ * so... use the platform callbacks if possible.
+ */
+
+ /* no real activity on the battery */
+ if (di->regs.ai < 2) {
+ if (!di->regs.ttf)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+ /* power is actually going in or out... */
+ if (di->regs.flags < 0)
+ return di->regs.flags;
+ if (di->regs.flags & BQ27000_STATUS_CHGS)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
+ /* Do we have accurate readings... */
+ if (di->regs.flags < 0)
+ return di->regs.flags;
+ if (di->regs.flags & BQ27000_STATUS_VDQ)
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (di->regs.volt < 0)
+ return di->regs.volt;
+ /* mV -> uV */
+ val->intval = di->regs.volt * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (di->regs.flags < 0)
+ return di->regs.flags;
+ if (di->regs.flags & BQ27000_STATUS_CHGS)
+ n = -NANOVOLTS_UNIT;
+ else
+ n = NANOVOLTS_UNIT;
+ if (di->regs.ai < 0)
+ return di->regs.ai;
+ val->intval = (di->regs.ai * n) / di->pdata->rsense_mohms;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ if (di->regs.lmd < 0)
+ return di->regs.lmd;
+ val->intval = (di->regs.lmd * 3570) / di->pdata->rsense_mohms;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ if (di->regs.temp < 0)
+ return di->regs.temp;
+ /* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/
+ /* 10926 = 27315 * 4 / 10 */
+ val->intval = (((long)di->regs.temp * 10l) - 10926) / 4;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = di->regs.rsoc;
+ if (val->intval < 0)
+ return val->intval;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = !(di->regs.rsoc < 0);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ if (di->regs.tte < 0)
+ return di->regs.tte;
+ val->intval = 60 * di->regs.tte;
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+ if (di->regs.ttf < 0)
+ return di->regs.ttf;
+ val->intval = 60 * di->regs.ttf;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ if (di->pdata->get_charger_online_status)
+ val->intval = (di->pdata->get_charger_online_status)();
+ else
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void bq27000_battery_work(struct work_struct *work)
+{
+ struct bq27000_device_info *di =
+ container_of(work, struct bq27000_device_info, work.work);
+
+ if ((di->pdata->hdq_initialized)()) {
+ struct bq27000_bat_regs regs;
+
+ regs.ai = hdq_read16(di, BQ27000_AI_L);
+ regs.flags = (di->pdata->hdq_read)(BQ27000_FLAGS);
+ regs.lmd = hdq_read16(di, BQ27000_LMD_L);
+ regs.rsoc = (di->pdata->hdq_read)(BQ27000_RSOC);
+ regs.temp = hdq_read16(di, BQ27000_TEMP_L);
+ regs.tte = hdq_read16(di, BQ27000_TTE_L);
+ regs.ttf = hdq_read16(di, BQ27000_TTF_L);
+ regs.volt = hdq_read16(di, BQ27000_VOLT_L);
+
+ if (memcmp (&regs, &di->regs, sizeof(regs)) != 0) {
+ di->regs = regs;
+ power_supply_changed(&di->bat);
+ }
+ }
+
+ if (!schedule_delayed_work(&di->work, cache_time))
+ dev_err(di->dev, "battery service reschedule failed\n");
+}
+
+static enum power_supply_property bq27000_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ 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_CAPACITY,
+ POWER_SUPPLY_PROP_ONLINE
+};
+
+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->bat.use_for_apm = 1;
+ di->pdata = pdata;
+
+ retval = power_supply_register(&pdev->dev, &di->bat);
+ if (retval) {
+ dev_err(di->dev, "failed to register battery\n");
+ goto batt_failed;
+ }
+
+ INIT_DELAYED_WORK(&di->work, bq27000_battery_work);
+
+ if (!schedule_delayed_work(&di->work, 0))
+ dev_err(di->dev, "failed to schedule bq27000_battery_work\n");
+
+ 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);
+
+ cancel_delayed_work(&di->work);
+
+ power_supply_unregister(&di->bat);
+
+ return 0;
+}
+
+void bq27000_charging_state_change(struct platform_device *pdev)
+{
+ struct bq27000_device_info *di = platform_get_drvdata(pdev);
+
+ if (!di)
+ return;
+}
+EXPORT_SYMBOL_GPL(bq27000_charging_state_change);
+
+#ifdef CONFIG_PM
+
+static int bq27000_battery_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct bq27000_device_info *di = platform_get_drvdata(pdev);
+
+ cancel_delayed_work(&di->work);
+ return 0;
+}
+
+static int bq27000_battery_resume(struct platform_device *pdev)
+{
+ struct bq27000_device_info *di = platform_get_drvdata(pdev);
+
+ schedule_delayed_work(&di->work, 0);
+ 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/drivers/power/hdq.c b/drivers/power/hdq.c
new file mode 100644
index 00000000000..cea024fec76
--- /dev/null
+++ b/drivers/power/hdq.c
@@ -0,0 +1,512 @@
+/*
+ * HDQ generic GPIO bitbang driver using FIQ
+ *
+ * (C) 2006-2007 by Openmoko, Inc.
+ * Author: Andy Green <andy@openmoko.com>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/hdq.h>
+
+#define HDQ_READ 0
+#define HDQ_WRITE 0x80
+
+enum hdq_bitbang_states {
+ HDQB_IDLE = 0,
+ HDQB_TX_BREAK,
+ HDQB_TX_BREAK_RECOVERY,
+ HDQB_ADS_CALC,
+ HDQB_ADS_LOW,
+ HDQB_ADS_HIGH,
+ HDQB_WAIT_RX,
+ HDQB_DATA_RX_LOW,
+ HDQB_DATA_RX_HIGH,
+ HDQB_WAIT_TX,
+};
+
+static struct hdq_priv {
+ u8 hdq_probed; /* nonzero after HDQ driver probed */
+ struct mutex hdq_lock; /* if you want to use hdq, you have to take lock */
+ u8 hdq_ads; /* b7..b6 = register address, b0 = r/w */
+ u8 hdq_tx_data; /* data to tx for write action */
+ u8 hdq_rx_data; /* data received in read action */
+ u8 hdq_request_ctr; /* incremented by "user" to request a transfer */
+ u8 hdq_transaction_ctr; /* incremented after each transfer */
+ u8 hdq_error; /* 0 = no error */
+ u8 hdq_ctr;
+ u8 hdq_ctr2;
+ u8 hdq_bit;
+ u8 hdq_shifter;
+ u8 hdq_tx_data_done;
+ enum hdq_bitbang_states hdq_state;
+ int reported_error;
+
+ struct hdq_platform_data *pdata;
+} hdq_priv;
+
+
+static void hdq_bad(void)
+{
+ if (!hdq_priv.reported_error)
+ printk(KERN_ERR "HDQ error: %d\n", hdq_priv.hdq_error);
+ hdq_priv.reported_error = 1;
+}
+
+static void hdq_good(void)
+{
+ if (hdq_priv.reported_error)
+ printk(KERN_INFO "HDQ responds again\n");
+ hdq_priv.reported_error = 0;
+}
+
+int hdq_fiq_handler(void)
+{
+ if (!hdq_priv.hdq_probed)
+ return 0;
+
+ switch (hdq_priv.hdq_state) {
+ case HDQB_IDLE:
+ if (hdq_priv.hdq_request_ctr == hdq_priv.hdq_transaction_ctr)
+ break;
+ hdq_priv.hdq_ctr = 250 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.pdata->gpio_set(0);
+ hdq_priv.pdata->gpio_dir_out();
+ hdq_priv.hdq_tx_data_done = 0;
+ hdq_priv.hdq_state = HDQB_TX_BREAK;
+ break;
+
+ case HDQB_TX_BREAK: /* issue low for > 190us */
+ if (--hdq_priv.hdq_ctr == 0) {
+ hdq_priv.hdq_ctr = 60 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_state = HDQB_TX_BREAK_RECOVERY;
+ hdq_priv.pdata->gpio_set(1);
+ }
+ break;
+
+ case HDQB_TX_BREAK_RECOVERY: /* issue low for > 40us */
+ if (--hdq_priv.hdq_ctr)
+ break;
+ hdq_priv.hdq_shifter = hdq_priv.hdq_ads;
+ hdq_priv.hdq_bit = 8; /* 8 bits of ads / rw */
+ hdq_priv.hdq_tx_data_done = 0; /* doing ads */
+ /* fallthru on last one */
+ case HDQB_ADS_CALC:
+ if (hdq_priv.hdq_shifter & 1)
+ hdq_priv.hdq_ctr = 50 / HDQ_SAMPLE_PERIOD_US;
+ else
+ hdq_priv.hdq_ctr = 120 / HDQ_SAMPLE_PERIOD_US;
+ /* carefully precompute the other phase length */
+ hdq_priv.hdq_ctr2 = (210 - (hdq_priv.hdq_ctr * HDQ_SAMPLE_PERIOD_US)) /
+ HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_state = HDQB_ADS_LOW;
+ hdq_priv.hdq_shifter >>= 1;
+ hdq_priv.hdq_bit--;
+ hdq_priv.pdata->gpio_set(0);
+ break;
+
+ case HDQB_ADS_LOW:
+ if (--hdq_priv.hdq_ctr)
+ break;
+ hdq_priv.pdata->gpio_set(1);
+ hdq_priv.hdq_state = HDQB_ADS_HIGH;
+ break;
+
+ case HDQB_ADS_HIGH:
+ if (--hdq_priv.hdq_ctr2 > 1) /* account for HDQB_ADS_CALC */
+ break;
+ if (hdq_priv.hdq_bit) { /* more bits to do */
+ hdq_priv.hdq_state = HDQB_ADS_CALC;
+ break;
+ }
+ /* no more bits, wait it out until hdq_priv.hdq_ctr2 exhausted */
+ if (hdq_priv.hdq_ctr2)
+ break;
+ /* ok no more bits and very last state */
+ hdq_priv.hdq_ctr = 60 / HDQ_SAMPLE_PERIOD_US;
+ /* FIXME 0 = read */
+ if (hdq_priv.hdq_ads & 0x80) { /* write the byte out */
+ /* set delay before payload */
+ hdq_priv.hdq_ctr = 300 / HDQ_SAMPLE_PERIOD_US;
+ /* already high, no need to write */
+ hdq_priv.hdq_state = HDQB_WAIT_TX;
+ break;
+ }
+ /* read the next byte */
+ hdq_priv.hdq_bit = 8; /* 8 bits of data */
+ hdq_priv.hdq_ctr = 2500 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_state = HDQB_WAIT_RX;
+ hdq_priv.pdata->gpio_dir_in();
+ break;
+
+ case HDQB_WAIT_TX: /* issue low for > 40us */
+ if (--hdq_priv.hdq_ctr)
+ break;
+ if (!hdq_priv.hdq_tx_data_done) { /* was that the data sent? */
+ hdq_priv.hdq_tx_data_done++;
+ hdq_priv.hdq_shifter = hdq_priv.hdq_tx_data;
+ hdq_priv.hdq_bit = 8; /* 8 bits of data */
+ hdq_priv.hdq_state = HDQB_ADS_CALC; /* start sending */
+ break;
+ }
+ hdq_priv.hdq_error = 0;
+ hdq_priv.hdq_transaction_ctr = hdq_priv.hdq_request_ctr;
+ hdq_priv.hdq_state = HDQB_IDLE; /* all tx is done */
+ /* idle in input mode, it's pulled up by 10K */
+ hdq_priv.pdata->gpio_dir_in();
+ break;
+
+ case HDQB_WAIT_RX: /* wait for battery to talk to us */
+ if (hdq_priv.pdata->gpio_get() == 0) {
+ /* it talks to us! */
+ hdq_priv.hdq_ctr2 = 1;
+ hdq_priv.hdq_bit = 8; /* 8 bits of data */
+ /* timeout */
+ hdq_priv.hdq_ctr = 500 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_state = HDQB_DATA_RX_LOW;
+ break;
+ }
+ if (--hdq_priv.hdq_ctr == 0) { /* timed out, error */
+ hdq_priv.hdq_error = 1;
+ hdq_priv.hdq_transaction_ctr = hdq_priv.hdq_request_ctr;
+ hdq_priv.hdq_state = HDQB_IDLE; /* abort */
+ }
+ break;
+
+ /*
+ * HDQ basically works by measuring the low time of the bit cell
+ * 32-50us --> '1', 80 - 145us --> '0'
+ */
+
+ case HDQB_DATA_RX_LOW:
+ if (hdq_priv.pdata->gpio_get()) {
+ hdq_priv.hdq_rx_data >>= 1;
+ if (hdq_priv.hdq_ctr2 <= (65 / HDQ_SAMPLE_PERIOD_US))
+ hdq_priv.hdq_rx_data |= 0x80;
+
+ if (--hdq_priv.hdq_bit == 0) {
+ hdq_priv.hdq_error = 0;
+ hdq_priv.hdq_transaction_ctr =
+ hdq_priv.hdq_request_ctr;
+
+ hdq_priv.hdq_state = HDQB_IDLE;
+ } else
+ hdq_priv.hdq_state = HDQB_DATA_RX_HIGH;
+ /* timeout */
+ hdq_priv.hdq_ctr = 1000 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_ctr2 = 1;
+ break;
+ }
+ hdq_priv.hdq_ctr2++;
+ if (--hdq_priv.hdq_ctr)
+ break;
+ /* timed out, error */
+ hdq_priv.hdq_error = 2;
+ hdq_priv.hdq_transaction_ctr = hdq_priv.hdq_request_ctr;
+ hdq_priv.hdq_state = HDQB_IDLE; /* abort */
+ break;
+
+ case HDQB_DATA_RX_HIGH:
+ if (!hdq_priv.pdata->gpio_get()) {
+ /* it talks to us! */
+ hdq_priv.hdq_ctr2 = 1;
+ /* timeout */
+ hdq_priv.hdq_ctr = 400 / HDQ_SAMPLE_PERIOD_US;
+ hdq_priv.hdq_state = HDQB_DATA_RX_LOW;
+ break;
+ }
+ if (--hdq_priv.hdq_ctr)
+ break;
+ /* timed out, error */
+ hdq_priv.hdq_error = 3;
+ hdq_priv.hdq_transaction_ctr = hdq_priv.hdq_request_ctr;
+
+ /* we're in input mode already */
+ hdq_priv.hdq_state = HDQB_IDLE; /* abort */
+ break;
+ }
+
+ /* Are we interested in keeping the FIQ source alive ? */
+ if (hdq_priv.hdq_state != HDQB_IDLE)
+ return 1;
+ else
+ return 0;
+}
+static int fiq_busy(void)
+{
+ int request = (volatile u8)hdq_priv.hdq_request_ctr;
+ int transact = (volatile u8)hdq_priv.hdq_transaction_ctr;
+
+
+ return (request != transact);
+}
+
+int hdq_initialized(void)
+{
+ return hdq_priv.hdq_probed;
+}
+EXPORT_SYMBOL_GPL(hdq_initialized);
+
+int hdq_read(int address)
+{
+ int count_sleeps = 5;
+ int ret = -ETIME;
+
+ if (!hdq_priv.hdq_probed)
+ return -EINVAL;
+
+ mutex_lock(&hdq_priv.hdq_lock);
+
+ hdq_priv.hdq_error = 0;
+ hdq_priv.hdq_ads = address | HDQ_READ;
+ hdq_priv.hdq_request_ctr++;
+ hdq_priv.pdata->kick_fiq();
+ /*
+ * FIQ takes care of it while we block our calling process
+ * But we're not spinning -- other processes run normally while
+ * we wait for the result
+ */
+ while (count_sleeps--) {
+ msleep(10); /* valid transaction always completes in < 10ms */
+
+ if (fiq_busy())
+ continue;
+
+ if (hdq_priv.hdq_error) {
+ hdq_bad();
+ goto done; /* didn't see a response in good time */
+ }
+ hdq_good();
+
+ ret = hdq_priv.hdq_rx_data;
+ goto done;
+ }
+
+done:
+ mutex_unlock(&hdq_priv.hdq_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hdq_read);
+
+int hdq_write(int address, u8 data)
+{
+ int count_sleeps = 5;
+ int ret = -ETIME;
+
+ if (!hdq_priv.hdq_probed)
+ return -EINVAL;
+
+ mutex_lock(&hdq_priv.hdq_lock);
+
+ hdq_priv.hdq_error = 0;
+ hdq_priv.hdq_ads = address | HDQ_WRITE;
+ hdq_priv.hdq_tx_data = data;
+ hdq_priv.hdq_request_ctr++;
+ hdq_priv.pdata->kick_fiq();
+ /*
+ * FIQ takes care of it while we block our calling process
+ * But we're not spinning -- other processes run normally while
+ * we wait for the result
+ */
+ while (count_sleeps--) {
+ msleep(10); /* valid transaction always completes in < 10ms */
+
+ if (fiq_busy())
+ continue; /* something bad with FIQ */
+
+ if (hdq_priv.hdq_error) {
+ hdq_bad();
+ goto done; /* didn't see a response in good time */
+ }
+ hdq_good();
+
+ ret = 0;
+ goto done;
+ }
+
+done:
+ mutex_unlock(&hdq_priv.hdq_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hdq_write);
+
+/* sysfs */
+
+static ssize_t hdq_sysfs_dump(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int n;
+ int v;
+ u8 u8a[128]; /* whole address space for HDQ */
+ char *end = buf;
+
+ if (!hdq_priv.hdq_probed)
+ return -EINVAL;
+
+ /* the dump does not take care about 16 bit regs, because at this
+ * bus level we don't know about the chip details
+ */
+ for (n = 0; n < sizeof(u8a); n++) {
+ v = hdq_read(n);
+ if (v < 0)
+ goto bail;
+ u8a[n] = v;
+ }
+
+ for (n = 0; n < sizeof(u8a); n += 16) {
+ hex_dump_to_buffer(u8a + n, sizeof(u8a), 16, 1, end, 4096, 0);
+ end += strlen(end);
+ *end++ = '\n';
+ *end = '\0';
+ }
+ return (end - buf);
+
+bail:
+ return sprintf(buf, "ERROR %d\n", v);
+}
+
+/* you write by <address> <data>, eg, "34 128" */
+
+#define atoi(str) simple_strtoul(((str != NULL) ? str : ""), NULL, 0)
+
+static ssize_t hdq_sysfs_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ const char *end = buf + count;
+ int address = atoi(buf);
+
+ if (!hdq_priv.hdq_probed)
+ return -EINVAL;
+
+ while ((buf != end) && (*buf != ' '))
+ buf++;
+ if (buf >= end)
+ return 0;
+ while ((buf < end) && (*buf == ' '))
+ buf++;
+ if (buf >= end)
+ return 0;
+
+ hdq_write(address, atoi(buf));
+
+ return count;
+}
+
+static DEVICE_ATTR(dump, 0400, hdq_sysfs_dump, NULL);
+static DEVICE_ATTR(write, 0600, NULL, hdq_sysfs_write);
+
+static struct attribute *hdq_sysfs_entries[] = {
+ &dev_attr_dump.attr,
+ &dev_attr_write.attr,
+ NULL
+};
+
+static struct attribute_group hdq_attr_group = {
+ .name = "hdq",
+ .attrs = hdq_sysfs_entries,
+};
+
+
+#ifdef CONFIG_PM
+static int hdq_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ /* after 18s of this, the battery monitor will also go to sleep */
+ hdq_priv.pdata->gpio_dir_in();
+ hdq_priv.pdata->disable_fiq();
+ return 0;
+}
+
+static int hdq_resume(struct platform_device *pdev)
+{
+ hdq_priv.pdata->gpio_set(1);
+ hdq_priv.pdata->gpio_dir_out();
+ hdq_priv.pdata->enable_fiq();
+ return 0;
+}
+#endif
+
+static int __init hdq_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct hdq_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return -EINVAL;
+
+ platform_set_drvdata(pdev, NULL);
+
+ mutex_init(&hdq_priv.hdq_lock);
+
+ /* set our HDQ comms pin from the platform data */
+ hdq_priv.pdata = pdata;
+
+ hdq_priv.pdata->gpio_set(1);
+ hdq_priv.pdata->gpio_dir_out();
+
+ /* Initialize FIQ */
+ if (hdq_priv.pdata->enable_fiq() < 0) {
+ dev_err(&pdev->dev, "Could not enable FIQ source\n");
+ return -EINVAL;
+ }
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &hdq_attr_group);
+ if (ret)
+ return ret;
+
+ hdq_priv.hdq_probed = 1; /* we are ready to do stuff now */
+
+ /*
+ * if wanted, users can defer registration of devices
+ * that depend on HDQ until after we register, and can use our
+ * device as parent so suspend-resume ordering is correct
+ */
+ if (pdata->attach_child_devices)
+ (pdata->attach_child_devices)(&pdev->dev);
+
+ hdq_priv.pdata = pdata;
+
+ return 0;
+}
+
+static int hdq_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &hdq_attr_group);
+ return 0;
+}
+
+static struct platform_driver hdq_driver = {
+ .probe = hdq_probe,
+ .remove = hdq_remove,
+#ifdef CONFIG_PM
+ .suspend = hdq_suspend,
+ .resume = hdq_resume,
+#endif
+ .driver = {
+ .name = "hdq",
+ },
+};
+
+static int __init hdq_init(void)
+{
+ return platform_driver_register(&hdq_driver);
+}
+
+static void __exit hdq_exit(void)
+{
+ platform_driver_unregister(&hdq_driver);
+}
+
+module_init(hdq_init);
+module_exit(hdq_exit);
+
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
+MODULE_DESCRIPTION("HDQ driver");