diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/power/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/power/Makefile | 3 | ||||
| -rw-r--r-- | drivers/power/bq27000_battery.c | 478 | ||||
| -rw-r--r-- | drivers/power/hdq.c | 512 |
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 (®s, &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"); |