464 строки
12 KiB
C
464 строки
12 KiB
C
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/*
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* Driver for batteries with DS2760 chips inside.
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*
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* Copyright © 2007 Anton Vorontsov
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* 2004-2007 Matt Reimer
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* 2004 Szabolcs Gyurko
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*
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* Author: Anton Vorontsov <cbou@mail.ru>
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* February 2007
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*
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* Matt Reimer <mreimer@vpop.net>
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* April 2004, 2005, 2007
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*
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* Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
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* September 2004
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*/
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#include <linux/module.h>
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#include <linux/param.h>
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#include <linux/jiffies.h>
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#include <linux/workqueue.h>
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#include <linux/pm.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include "../w1/w1.h"
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#include "../w1/slaves/w1_ds2760.h"
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struct ds2760_device_info {
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struct device *dev;
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/* DS2760 data, valid after calling ds2760_battery_read_status() */
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unsigned long update_time; /* jiffies when data read */
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char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */
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int voltage_raw; /* units of 4.88 mV */
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int voltage_uV; /* units of µV */
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int current_raw; /* units of 0.625 mA */
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int current_uA; /* units of µA */
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int accum_current_raw; /* units of 0.25 mAh */
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int accum_current_uAh; /* units of µAh */
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int temp_raw; /* units of 0.125 °C */
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int temp_C; /* units of 0.1 °C */
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int rated_capacity; /* units of µAh */
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int rem_capacity; /* percentage */
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int full_active_uAh; /* units of µAh */
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int empty_uAh; /* units of µAh */
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int life_sec; /* units of seconds */
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int charge_status; /* POWER_SUPPLY_STATUS_* */
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int full_counter;
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struct power_supply bat;
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struct device *w1_dev;
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struct workqueue_struct *monitor_wqueue;
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struct delayed_work monitor_work;
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};
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static unsigned int cache_time = 1000;
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module_param(cache_time, uint, 0644);
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MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
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/* Some batteries have their rated capacity stored a N * 10 mAh, while
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* others use an index into this table. */
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static int rated_capacities[] = {
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0,
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920, /* Samsung */
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920, /* BYD */
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920, /* Lishen */
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920, /* NEC */
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1440, /* Samsung */
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1440, /* BYD */
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1440, /* Lishen */
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1440, /* NEC */
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2880, /* Samsung */
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2880, /* BYD */
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2880, /* Lishen */
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2880 /* NEC */
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};
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/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
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* temp is in Celsius */
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static int battery_interpolate(int array[], int temp)
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{
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int index, dt;
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if (temp <= 0)
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return array[0];
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if (temp >= 40)
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return array[4];
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index = temp / 10;
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dt = temp % 10;
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return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
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}
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static int ds2760_battery_read_status(struct ds2760_device_info *di)
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{
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int ret, i, start, count, scale[5];
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if (di->update_time && time_before(jiffies, di->update_time +
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msecs_to_jiffies(cache_time)))
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return 0;
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/* The first time we read the entire contents of SRAM/EEPROM,
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* but after that we just read the interesting bits that change. */
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if (di->update_time == 0) {
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start = 0;
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count = DS2760_DATA_SIZE;
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} else {
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start = DS2760_VOLTAGE_MSB;
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count = DS2760_TEMP_LSB - start + 1;
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}
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ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
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if (ret != count) {
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dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
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di->w1_dev);
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return 1;
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}
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di->update_time = jiffies;
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/* DS2760 reports voltage in units of 4.88mV, but the battery class
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* reports in units of uV, so convert by multiplying by 4880. */
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di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
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(di->raw[DS2760_VOLTAGE_LSB] >> 5);
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di->voltage_uV = di->voltage_raw * 4880;
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/* DS2760 reports current in signed units of 0.625mA, but the battery
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* class reports in units of µA, so convert by multiplying by 625. */
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di->current_raw =
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(((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
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(di->raw[DS2760_CURRENT_LSB] >> 3);
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di->current_uA = di->current_raw * 625;
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/* DS2760 reports accumulated current in signed units of 0.25mAh. */
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di->accum_current_raw =
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(((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
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di->raw[DS2760_CURRENT_ACCUM_LSB];
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di->accum_current_uAh = di->accum_current_raw * 250;
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/* DS2760 reports temperature in signed units of 0.125°C, but the
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* battery class reports in units of 1/10 °C, so we convert by
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* multiplying by .125 * 10 = 1.25. */
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di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
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(di->raw[DS2760_TEMP_LSB] >> 5);
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di->temp_C = di->temp_raw + (di->temp_raw / 4);
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/* At least some battery monitors (e.g. HP iPAQ) store the battery's
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* maximum rated capacity. */
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if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
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di->rated_capacity = rated_capacities[
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(unsigned int)di->raw[DS2760_RATED_CAPACITY]];
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else
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di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
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di->rated_capacity *= 1000; /* convert to µAh */
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/* Calculate the full level at the present temperature. */
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di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
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di->raw[DS2760_ACTIVE_FULL + 1];
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scale[0] = di->raw[DS2760_ACTIVE_FULL] << 8 |
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di->raw[DS2760_ACTIVE_FULL + 1];
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for (i = 1; i < 5; i++)
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scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + i];
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di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
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di->full_active_uAh *= 1000; /* convert to µAh */
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/* Calculate the empty level at the present temperature. */
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scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
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for (i = 3; i >= 0; i--)
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scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
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di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
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di->empty_uAh *= 1000; /* convert to µAh */
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/* From Maxim Application Note 131: remaining capacity =
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* ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
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di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
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(di->full_active_uAh - di->empty_uAh);
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if (di->rem_capacity < 0)
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di->rem_capacity = 0;
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if (di->rem_capacity > 100)
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di->rem_capacity = 100;
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if (di->current_uA)
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di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
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3600L) / di->current_uA;
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else
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di->life_sec = 0;
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return 0;
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}
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static void ds2760_battery_update_status(struct ds2760_device_info *di)
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{
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int old_charge_status = di->charge_status;
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ds2760_battery_read_status(di);
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if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
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di->full_counter = 0;
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if (power_supply_am_i_supplied(&di->bat)) {
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if (di->current_uA > 10000) {
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di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
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di->full_counter = 0;
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} else if (di->current_uA < -5000) {
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if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
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dev_notice(di->dev, "not enough power to "
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"charge\n");
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di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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di->full_counter = 0;
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} else if (di->current_uA < 10000 &&
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di->charge_status != POWER_SUPPLY_STATUS_FULL) {
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/* Don't consider the battery to be full unless
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* we've seen the current < 10 mA at least two
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* consecutive times. */
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di->full_counter++;
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if (di->full_counter < 2) {
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di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
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} else {
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unsigned char acr[2];
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int acr_val;
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/* acr is in units of 0.25 mAh */
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acr_val = di->full_active_uAh * 4L / 1000;
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acr[0] = acr_val >> 8;
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acr[1] = acr_val & 0xff;
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if (w1_ds2760_write(di->w1_dev, acr,
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DS2760_CURRENT_ACCUM_MSB, 2) < 2)
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dev_warn(di->dev,
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"ACR reset failed\n");
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di->charge_status = POWER_SUPPLY_STATUS_FULL;
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}
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}
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} else {
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di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
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di->full_counter = 0;
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}
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if (di->charge_status != old_charge_status)
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power_supply_changed(&di->bat);
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}
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static void ds2760_battery_work(struct work_struct *work)
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{
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struct ds2760_device_info *di = container_of(work,
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struct ds2760_device_info, monitor_work.work);
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const int interval = HZ * 60;
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dev_dbg(di->dev, "%s\n", __FUNCTION__);
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ds2760_battery_update_status(di);
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queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
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}
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#define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
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bat);
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static void ds2760_battery_external_power_changed(struct power_supply *psy)
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{
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struct ds2760_device_info *di = to_ds2760_device_info(psy);
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dev_dbg(di->dev, "%s\n", __FUNCTION__);
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cancel_delayed_work(&di->monitor_work);
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queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
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}
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static int ds2760_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct ds2760_device_info *di = to_ds2760_device_info(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = di->charge_status;
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return 0;
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default:
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break;
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}
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ds2760_battery_read_status(di);
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switch (psp) {
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = di->voltage_uV;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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val->intval = di->current_uA;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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val->intval = di->rated_capacity;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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val->intval = di->full_active_uAh;
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break;
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case POWER_SUPPLY_PROP_CHARGE_EMPTY:
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val->intval = di->empty_uAh;
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break;
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case POWER_SUPPLY_PROP_CHARGE_NOW:
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val->intval = di->accum_current_uAh;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = di->temp_C;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property ds2760_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_EMPTY,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_TEMP,
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};
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static int ds2760_battery_probe(struct platform_device *pdev)
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{
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int retval = 0;
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struct ds2760_device_info *di;
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struct ds2760_platform_data *pdata;
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di = kzalloc(sizeof(*di), GFP_KERNEL);
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if (!di) {
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retval = -ENOMEM;
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goto di_alloc_failed;
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}
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|
|
platform_set_drvdata(pdev, di);
|
||
|
|
|
||
|
|
pdata = pdev->dev.platform_data;
|
||
|
|
di->dev = &pdev->dev;
|
||
|
|
di->w1_dev = pdev->dev.parent;
|
||
|
|
di->bat.name = pdev->dev.bus_id;
|
||
|
|
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
|
||
|
|
di->bat.properties = ds2760_battery_props;
|
||
|
|
di->bat.num_properties = ARRAY_SIZE(ds2760_battery_props);
|
||
|
|
di->bat.get_property = ds2760_battery_get_property;
|
||
|
|
di->bat.external_power_changed =
|
||
|
|
ds2760_battery_external_power_changed;
|
||
|
|
|
||
|
|
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
||
|
|
|
||
|
|
retval = power_supply_register(&pdev->dev, &di->bat);
|
||
|
|
if (retval) {
|
||
|
|
dev_err(di->dev, "failed to register battery");
|
||
|
|
goto batt_failed;
|
||
|
|
}
|
||
|
|
|
||
|
|
INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
|
||
|
|
di->monitor_wqueue = create_singlethread_workqueue(pdev->dev.bus_id);
|
||
|
|
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:
|
||
|
|
kfree(di);
|
||
|
|
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_rearming_delayed_workqueue(di->monitor_wqueue,
|
||
|
|
&di->monitor_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);
|
||
|
|
|
||
|
|
cancel_delayed_work(&di->monitor_work);
|
||
|
|
queue_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 */
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init ds2760_battery_init(void)
|
||
|
|
{
|
||
|
|
return platform_driver_register(&ds2760_battery_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit ds2760_battery_exit(void)
|
||
|
|
{
|
||
|
|
platform_driver_unregister(&ds2760_battery_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(ds2760_battery_init);
|
||
|
|
module_exit(ds2760_battery_exit);
|
||
|
|
|
||
|
|
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");
|