diff options
author | Sebastian Reichel <sre@kernel.org> | 2016-06-17 13:54:32 +0200 |
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committer | Sebastian Reichel <sre@kernel.org> | 2016-08-11 01:11:03 +0200 |
commit | 8c0984e5a75337df513047ec92a6c09d78e3e5cd (patch) | |
tree | a2fc0a0dd7c7c40d9379bdd1c2b279c0959d0e1f /drivers/power/ds2760_battery.c | |
parent | Linux 4.8-rc1 (diff) | |
download | linux-8c0984e5a75337df513047ec92a6c09d78e3e5cd.tar.xz linux-8c0984e5a75337df513047ec92a6c09d78e3e5cd.zip |
power: move power supply drivers to power/supply
This moves all power supply drivers from drivers/power/
to drivers/power/supply/. The intention is a cleaner
source tree, since drivers/power/ also contains frameworks
unrelated to power supply, like adaptive voltage scaling.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'drivers/power/ds2760_battery.c')
-rw-r--r-- | drivers/power/ds2760_battery.c | 647 |
1 files changed, 0 insertions, 647 deletions
diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c deleted file mode 100644 index 80f73ccb77ab..000000000000 --- a/drivers/power/ds2760_battery.c +++ /dev/null @@ -1,647 +0,0 @@ -/* - * Driver for batteries with DS2760 chips inside. - * - * 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/workqueue.h> -#include <linux/pm.h> -#include <linux/slab.h> -#include <linux/platform_device.h> -#include <linux/power_supply.h> - -#include "../w1/w1.h" -#include "../w1/slaves/w1_ds2760.h" - -struct ds2760_device_info { - struct device *dev; - - /* DS2760 data, valid after calling ds2760_battery_read_status() */ - unsigned long update_time; /* jiffies when data read */ - char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */ - int voltage_raw; /* units of 4.88 mV */ - int voltage_uV; /* units of µV */ - int current_raw; /* units of 0.625 mA */ - int current_uA; /* units of µA */ - int accum_current_raw; /* units of 0.25 mAh */ - int accum_current_uAh; /* units of µAh */ - int temp_raw; /* units of 0.125 °C */ - int temp_C; /* units of 0.1 °C */ - int rated_capacity; /* units of µAh */ - int rem_capacity; /* percentage */ - int full_active_uAh; /* units of µAh */ - int empty_uAh; /* units of µAh */ - int life_sec; /* units of seconds */ - int charge_status; /* POWER_SUPPLY_STATUS_* */ - - int full_counter; - struct power_supply *bat; - struct power_supply_desc bat_desc; - struct device *w1_dev; - struct workqueue_struct *monitor_wqueue; - struct delayed_work monitor_work; - struct delayed_work set_charged_work; -}; - -static unsigned int cache_time = 1000; -module_param(cache_time, uint, 0644); -MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); - -static bool pmod_enabled; -module_param(pmod_enabled, bool, 0644); -MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit"); - -static unsigned int rated_capacity; -module_param(rated_capacity, uint, 0644); -MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index"); - -static unsigned int current_accum; -module_param(current_accum, uint, 0644); -MODULE_PARM_DESC(current_accum, "current accumulator value"); - -/* Some batteries have their rated capacity stored a N * 10 mAh, while - * others use an index into this table. */ -static int rated_capacities[] = { - 0, - 920, /* Samsung */ - 920, /* BYD */ - 920, /* Lishen */ - 920, /* NEC */ - 1440, /* Samsung */ - 1440, /* BYD */ -#ifdef CONFIG_MACH_H4700 - 1800, /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */ -#else - 1440, /* Lishen */ -#endif - 1440, /* NEC */ - 2880, /* Samsung */ - 2880, /* BYD */ - 2880, /* Lishen */ - 2880, /* NEC */ -#ifdef CONFIG_MACH_H4700 - 0, - 3600, /* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */ -#endif -}; - -/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C - * temp is in Celsius */ -static int battery_interpolate(int array[], int temp) -{ - int index, dt; - - if (temp <= 0) - return array[0]; - if (temp >= 40) - return array[4]; - - index = temp / 10; - dt = temp % 10; - - return array[index] + (((array[index + 1] - array[index]) * dt) / 10); -} - -static int ds2760_battery_read_status(struct ds2760_device_info *di) -{ - int ret, i, start, count, scale[5]; - - if (di->update_time && time_before(jiffies, di->update_time + - msecs_to_jiffies(cache_time))) - return 0; - - /* The first time we read the entire contents of SRAM/EEPROM, - * but after that we just read the interesting bits that change. */ - if (di->update_time == 0) { - start = 0; - count = DS2760_DATA_SIZE; - } else { - start = DS2760_VOLTAGE_MSB; - count = DS2760_TEMP_LSB - start + 1; - } - - ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count); - if (ret != count) { - dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", - di->w1_dev); - return 1; - } - - di->update_time = jiffies; - - /* DS2760 reports voltage in units of 4.88mV, but the battery class - * reports in units of uV, so convert by multiplying by 4880. */ - di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | - (di->raw[DS2760_VOLTAGE_LSB] >> 5); - di->voltage_uV = di->voltage_raw * 4880; - - /* DS2760 reports current in signed units of 0.625mA, but the battery - * class reports in units of µA, so convert by multiplying by 625. */ - di->current_raw = - (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | - (di->raw[DS2760_CURRENT_LSB] >> 3); - di->current_uA = di->current_raw * 625; - - /* DS2760 reports accumulated current in signed units of 0.25mAh. */ - di->accum_current_raw = - (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | - di->raw[DS2760_CURRENT_ACCUM_LSB]; - di->accum_current_uAh = di->accum_current_raw * 250; - - /* DS2760 reports temperature in signed units of 0.125°C, but the - * battery class reports in units of 1/10 °C, so we convert by - * multiplying by .125 * 10 = 1.25. */ - di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | - (di->raw[DS2760_TEMP_LSB] >> 5); - di->temp_C = di->temp_raw + (di->temp_raw / 4); - - /* At least some battery monitors (e.g. HP iPAQ) store the battery's - * maximum rated capacity. */ - if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) - di->rated_capacity = rated_capacities[ - (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; - else - di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; - - di->rated_capacity *= 1000; /* convert to µAh */ - - /* Calculate the full level at the present temperature. */ - di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | - di->raw[DS2760_ACTIVE_FULL + 1]; - - /* If the full_active_uAh value is not given, fall back to the rated - * capacity. This is likely to happen when chips are not part of the - * battery pack and is therefore not bootstrapped. */ - if (di->full_active_uAh == 0) - di->full_active_uAh = di->rated_capacity / 1000L; - - scale[0] = di->full_active_uAh; - for (i = 1; i < 5; i++) - scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i]; - - di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); - di->full_active_uAh *= 1000; /* convert to µAh */ - - /* Calculate the empty level at the present temperature. */ - scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; - for (i = 3; i >= 0; i--) - scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; - - di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); - di->empty_uAh *= 1000; /* convert to µAh */ - - if (di->full_active_uAh == di->empty_uAh) - di->rem_capacity = 0; - else - /* From Maxim Application Note 131: remaining capacity = - * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ - di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / - (di->full_active_uAh - di->empty_uAh); - - if (di->rem_capacity < 0) - di->rem_capacity = 0; - if (di->rem_capacity > 100) - di->rem_capacity = 100; - - if (di->current_uA < -100L) - di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) - / (di->current_uA / 100L); - else - di->life_sec = 0; - - return 0; -} - -static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, - unsigned int acr_val) -{ - unsigned char acr[2]; - - /* acr is in units of 0.25 mAh */ - acr_val *= 4L; - acr_val /= 1000; - - acr[0] = acr_val >> 8; - acr[1] = acr_val & 0xff; - - if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) - dev_warn(di->dev, "ACR write failed\n"); -} - -static void ds2760_battery_update_status(struct ds2760_device_info *di) -{ - int old_charge_status = di->charge_status; - - ds2760_battery_read_status(di); - - if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) - di->full_counter = 0; - - if (power_supply_am_i_supplied(di->bat)) { - if (di->current_uA > 10000) { - di->charge_status = POWER_SUPPLY_STATUS_CHARGING; - di->full_counter = 0; - } else if (di->current_uA < -5000) { - if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) - dev_notice(di->dev, "not enough power to " - "charge\n"); - di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; - di->full_counter = 0; - } else if (di->current_uA < 10000 && - di->charge_status != POWER_SUPPLY_STATUS_FULL) { - - /* Don't consider the battery to be full unless - * we've seen the current < 10 mA at least two - * consecutive times. */ - - di->full_counter++; - - if (di->full_counter < 2) { - di->charge_status = POWER_SUPPLY_STATUS_CHARGING; - } else { - di->charge_status = POWER_SUPPLY_STATUS_FULL; - ds2760_battery_set_current_accum(di, - di->full_active_uAh); - } - } - } else { - di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; - di->full_counter = 0; - } - - if (di->charge_status != old_charge_status) - power_supply_changed(di->bat); -} - -static void ds2760_battery_write_status(struct ds2760_device_info *di, - char status) -{ - if (status == di->raw[DS2760_STATUS_REG]) - return; - - w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); - w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); - w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); -} - -static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, - unsigned char rated_capacity) -{ - if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) - return; - - w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); - w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); - w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); -} - -static void ds2760_battery_write_active_full(struct ds2760_device_info *di, - int active_full) -{ - unsigned char tmp[2] = { - active_full >> 8, - active_full & 0xff - }; - - if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && - tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) - return; - - w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); - w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); - w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); - - /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL - * values won't be read back by ds2760_battery_read_status() */ - di->raw[DS2760_ACTIVE_FULL] = tmp[0]; - di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; -} - -static void ds2760_battery_work(struct work_struct *work) -{ - struct ds2760_device_info *di = container_of(work, - struct ds2760_device_info, monitor_work.work); - const int interval = HZ * 60; - - dev_dbg(di->dev, "%s\n", __func__); - - ds2760_battery_update_status(di); - queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); -} - -static void ds2760_battery_external_power_changed(struct power_supply *psy) -{ - struct ds2760_device_info *di = power_supply_get_drvdata(psy); - - dev_dbg(di->dev, "%s\n", __func__); - - mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); -} - - -static void ds2760_battery_set_charged_work(struct work_struct *work) -{ - char bias; - struct ds2760_device_info *di = container_of(work, - struct ds2760_device_info, set_charged_work.work); - - dev_dbg(di->dev, "%s\n", __func__); - - ds2760_battery_read_status(di); - - /* When we get notified by external circuitry that the battery is - * considered fully charged now, we know that there is no current - * flow any more. However, the ds2760's internal current meter is - * too inaccurate to rely on - spec say something ~15% failure. - * Hence, we use the current offset bias register to compensate - * that error. - */ - - if (!power_supply_am_i_supplied(di->bat)) - return; - - bias = (signed char) di->current_raw + - (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS]; - - dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); - - w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); - w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); - w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); - - /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS - * value won't be read back by ds2760_battery_read_status() */ - di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias; -} - -static void ds2760_battery_set_charged(struct power_supply *psy) -{ - struct ds2760_device_info *di = power_supply_get_drvdata(psy); - - /* postpone the actual work by 20 secs. This is for debouncing GPIO - * signals and to let the current value settle. See AN4188. */ - mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20); -} - -static int ds2760_battery_get_property(struct power_supply *psy, - enum power_supply_property psp, - union power_supply_propval *val) -{ - struct ds2760_device_info *di = power_supply_get_drvdata(psy); - - switch (psp) { - case POWER_SUPPLY_PROP_STATUS: - val->intval = di->charge_status; - return 0; - default: - break; - } - - ds2760_battery_read_status(di); - - switch (psp) { - case POWER_SUPPLY_PROP_VOLTAGE_NOW: - val->intval = di->voltage_uV; - break; - case POWER_SUPPLY_PROP_CURRENT_NOW: - val->intval = di->current_uA; - break; - case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: - val->intval = di->rated_capacity; - break; - case POWER_SUPPLY_PROP_CHARGE_FULL: - val->intval = di->full_active_uAh; - break; - case POWER_SUPPLY_PROP_CHARGE_EMPTY: - val->intval = di->empty_uAh; - break; - case POWER_SUPPLY_PROP_CHARGE_NOW: - val->intval = di->accum_current_uAh; - break; - case POWER_SUPPLY_PROP_TEMP: - val->intval = di->temp_C; - break; - case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: - val->intval = di->life_sec; - break; - case POWER_SUPPLY_PROP_CAPACITY: - val->intval = di->rem_capacity; - break; - default: - return -EINVAL; - } - - return 0; -} - -static int ds2760_battery_set_property(struct power_supply *psy, - enum power_supply_property psp, - const union power_supply_propval *val) -{ - struct ds2760_device_info *di = power_supply_get_drvdata(psy); - - switch (psp) { - case POWER_SUPPLY_PROP_CHARGE_FULL: - /* the interface counts in uAh, convert the value */ - ds2760_battery_write_active_full(di, val->intval / 1000L); - break; - - case POWER_SUPPLY_PROP_CHARGE_NOW: - /* ds2760_battery_set_current_accum() does the conversion */ - ds2760_battery_set_current_accum(di, val->intval); - break; - - default: - return -EPERM; - } - - return 0; -} - -static int ds2760_battery_property_is_writeable(struct power_supply *psy, - enum power_supply_property psp) -{ - switch (psp) { - case POWER_SUPPLY_PROP_CHARGE_FULL: - case POWER_SUPPLY_PROP_CHARGE_NOW: - return 1; - - default: - break; - } - - return 0; -} - -static enum power_supply_property ds2760_battery_props[] = { - POWER_SUPPLY_PROP_STATUS, - POWER_SUPPLY_PROP_VOLTAGE_NOW, - POWER_SUPPLY_PROP_CURRENT_NOW, - POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, - POWER_SUPPLY_PROP_CHARGE_FULL, - POWER_SUPPLY_PROP_CHARGE_EMPTY, - POWER_SUPPLY_PROP_CHARGE_NOW, - POWER_SUPPLY_PROP_TEMP, - POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, - POWER_SUPPLY_PROP_CAPACITY, -}; - -static int ds2760_battery_probe(struct platform_device *pdev) -{ - struct power_supply_config psy_cfg = {}; - char status; - int retval = 0; - struct ds2760_device_info *di; - - di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); - if (!di) { - retval = -ENOMEM; - goto di_alloc_failed; - } - - platform_set_drvdata(pdev, di); - - di->dev = &pdev->dev; - di->w1_dev = pdev->dev.parent; - di->bat_desc.name = dev_name(&pdev->dev); - di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; - di->bat_desc.properties = ds2760_battery_props; - di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); - di->bat_desc.get_property = ds2760_battery_get_property; - di->bat_desc.set_property = ds2760_battery_set_property; - di->bat_desc.property_is_writeable = - ds2760_battery_property_is_writeable; - di->bat_desc.set_charged = ds2760_battery_set_charged; - di->bat_desc.external_power_changed = - ds2760_battery_external_power_changed; - - psy_cfg.drv_data = di; - - di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; - - /* enable sleep mode feature */ - ds2760_battery_read_status(di); - status = di->raw[DS2760_STATUS_REG]; - if (pmod_enabled) - status |= DS2760_STATUS_PMOD; - else - status &= ~DS2760_STATUS_PMOD; - - ds2760_battery_write_status(di, status); - - /* set rated capacity from module param */ - if (rated_capacity) - ds2760_battery_write_rated_capacity(di, rated_capacity); - - /* set current accumulator if given as parameter. - * this should only be done for bootstrapping the value */ - if (current_accum) - ds2760_battery_set_current_accum(di, current_accum); - - di->bat = power_supply_register(&pdev->dev, &di->bat_desc, &psy_cfg); - if (IS_ERR(di->bat)) { - dev_err(di->dev, "failed to register battery\n"); - retval = PTR_ERR(di->bat); - goto batt_failed; - } - - INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); - INIT_DELAYED_WORK(&di->set_charged_work, - ds2760_battery_set_charged_work); - di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev)); - if (!di->monitor_wqueue) { - retval = -ESRCH; - goto workqueue_failed; - } - queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); - - goto success; - -workqueue_failed: - power_supply_unregister(di->bat); -batt_failed: -di_alloc_failed: -success: - return retval; -} - -static int ds2760_battery_remove(struct platform_device *pdev) -{ - struct ds2760_device_info *di = platform_get_drvdata(pdev); - - cancel_delayed_work_sync(&di->monitor_work); - cancel_delayed_work_sync(&di->set_charged_work); - destroy_workqueue(di->monitor_wqueue); - power_supply_unregister(di->bat); - - return 0; -} - -#ifdef CONFIG_PM - -static int ds2760_battery_suspend(struct platform_device *pdev, - pm_message_t state) -{ - struct ds2760_device_info *di = platform_get_drvdata(pdev); - - di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; - - return 0; -} - -static int ds2760_battery_resume(struct platform_device *pdev) -{ - struct ds2760_device_info *di = platform_get_drvdata(pdev); - - di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; - power_supply_changed(di->bat); - - mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); - - return 0; -} - -#else - -#define ds2760_battery_suspend NULL -#define ds2760_battery_resume NULL - -#endif /* CONFIG_PM */ - -MODULE_ALIAS("platform:ds2760-battery"); - -static struct platform_driver ds2760_battery_driver = { - .driver = { - .name = "ds2760-battery", - }, - .probe = ds2760_battery_probe, - .remove = ds2760_battery_remove, - .suspend = ds2760_battery_suspend, - .resume = ds2760_battery_resume, -}; - -module_platform_driver(ds2760_battery_driver); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " - "Matt Reimer <mreimer@vpop.net>, " - "Anton Vorontsov <cbou@mail.ru>"); -MODULE_DESCRIPTION("ds2760 battery driver"); 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