diff options
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/power')
| -rw-r--r-- | target/linux/s3c24xx/files-2.6.30/drivers/power/bq27000_battery.c | 477 | ||||
| -rw-r--r-- | target/linux/s3c24xx/files-2.6.30/drivers/power/hdq.c | 515 |
2 files changed, 0 insertions, 992 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/power/bq27000_battery.c b/target/linux/s3c24xx/files-2.6.30/drivers/power/bq27000_battery.c deleted file mode 100644 index 32655dce1f..0000000000 --- a/target/linux/s3c24xx/files-2.6.30/drivers/power/bq27000_battery.c +++ /dev/null @@ -1,477 +0,0 @@ -/* - * 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> - -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/target/linux/s3c24xx/files-2.6.30/drivers/power/hdq.c b/target/linux/s3c24xx/files-2.6.30/drivers/power/hdq.c deleted file mode 100644 index f03fabfb1a..0000000000 --- a/target/linux/s3c24xx/files-2.6.30/drivers/power/hdq.c +++ /dev/null @@ -1,515 +0,0 @@ -/* - * 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 */ - unsigned long hdq_gpio_pin; /* GTA02 = GPD14 which pin to meddle with */ - 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) -{ - struct resource *r = platform_get_resource(pdev, 0, 0); - int ret; - struct hdq_platform_data *pdata = pdev->dev.platform_data; - - if (!r || !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.hdq_gpio_pin = r->start; - 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"); |