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The majority of all pxa board files has not been touched in a long time, and no users have spoken up in favor of keeping them around. This leaves only support for the platforms that were already converted to DT, as well as the gumstix and spitz/akita/borzoi machines that work in qemu and can still be converted to DT later. Cc: Ales Bardorfer <ales@i-tech.si> Cc: Ales Snuparek <snuparek@atlas.cz> Cc: Alex Osborne <ato@meshy.org> Cc: Alex Osborne <bobofdoom@gmail.com> Cc: Dirk Opfer <dirk@opfer-online.de> Cc: Ian Molton <spyro@f2s.com> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Michael Petchkovsky <mkpetch@internode.on.net> Cc: Nick Bane <nick@cecomputing.co.uk> Cc: Paul Parsons <lost.distance@yahoo.com> Cc: Philipp Zabel <philipp.zabel@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Sergey Lapin <slapin@ossfans.org> Cc: Tomas Cech <sleep_walker@suse.cz> Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
809 lines
22 KiB
C
809 lines
22 KiB
C
/*
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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/slab.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/suspend.h>
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#include <linux/w1.h>
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#include <linux/of.h>
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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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static bool pmod_enabled;
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module_param(pmod_enabled, bool, 0644);
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MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
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static unsigned int rated_capacity;
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module_param(rated_capacity, uint, 0644);
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MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
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static unsigned int current_accum;
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module_param(current_accum, uint, 0644);
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MODULE_PARM_DESC(current_accum, "current accumulator value");
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#define W1_FAMILY_DS2760 0x30
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/* Known commands to the DS2760 chip */
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#define W1_DS2760_SWAP 0xAA
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#define W1_DS2760_READ_DATA 0x69
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#define W1_DS2760_WRITE_DATA 0x6C
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#define W1_DS2760_COPY_DATA 0x48
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#define W1_DS2760_RECALL_DATA 0xB8
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#define W1_DS2760_LOCK 0x6A
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/* Number of valid register addresses */
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#define DS2760_DATA_SIZE 0x40
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#define DS2760_PROTECTION_REG 0x00
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#define DS2760_STATUS_REG 0x01
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#define DS2760_STATUS_IE (1 << 2)
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#define DS2760_STATUS_SWEN (1 << 3)
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#define DS2760_STATUS_RNAOP (1 << 4)
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#define DS2760_STATUS_PMOD (1 << 5)
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#define DS2760_EEPROM_REG 0x07
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#define DS2760_SPECIAL_FEATURE_REG 0x08
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#define DS2760_VOLTAGE_MSB 0x0c
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#define DS2760_VOLTAGE_LSB 0x0d
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#define DS2760_CURRENT_MSB 0x0e
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#define DS2760_CURRENT_LSB 0x0f
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#define DS2760_CURRENT_ACCUM_MSB 0x10
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#define DS2760_CURRENT_ACCUM_LSB 0x11
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#define DS2760_TEMP_MSB 0x18
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#define DS2760_TEMP_LSB 0x19
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#define DS2760_EEPROM_BLOCK0 0x20
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#define DS2760_ACTIVE_FULL 0x20
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#define DS2760_EEPROM_BLOCK1 0x30
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#define DS2760_STATUS_WRITE_REG 0x31
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#define DS2760_RATED_CAPACITY 0x32
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#define DS2760_CURRENT_OFFSET_BIAS 0x33
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#define DS2760_ACTIVE_EMPTY 0x3b
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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 power_supply_desc bat_desc;
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struct workqueue_struct *monitor_wqueue;
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struct delayed_work monitor_work;
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struct delayed_work set_charged_work;
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struct notifier_block pm_notifier;
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};
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static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
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int io)
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{
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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if (!dev)
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return 0;
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mutex_lock(&sl->master->bus_mutex);
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if (addr > DS2760_DATA_SIZE || addr < 0) {
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count = 0;
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goto out;
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}
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if (addr + count > DS2760_DATA_SIZE)
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count = DS2760_DATA_SIZE - addr;
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if (!w1_reset_select_slave(sl)) {
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if (!io) {
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w1_write_8(sl->master, W1_DS2760_READ_DATA);
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w1_write_8(sl->master, addr);
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count = w1_read_block(sl->master, buf, count);
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} else {
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w1_write_8(sl->master, W1_DS2760_WRITE_DATA);
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w1_write_8(sl->master, addr);
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w1_write_block(sl->master, buf, count);
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/* XXX w1_write_block returns void, not n_written */
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}
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}
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out:
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mutex_unlock(&sl->master->bus_mutex);
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return count;
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}
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static int w1_ds2760_read(struct device *dev,
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char *buf, int addr,
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size_t count)
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{
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return w1_ds2760_io(dev, buf, addr, count, 0);
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}
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static int w1_ds2760_write(struct device *dev,
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char *buf,
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int addr, size_t count)
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{
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return w1_ds2760_io(dev, buf, addr, count, 1);
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}
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static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)
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{
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
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if (!dev)
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return -EINVAL;
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mutex_lock(&sl->master->bus_mutex);
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if (w1_reset_select_slave(sl) == 0) {
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w1_write_8(sl->master, cmd);
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w1_write_8(sl->master, addr);
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}
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mutex_unlock(&sl->master->bus_mutex);
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return 0;
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}
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static int w1_ds2760_store_eeprom(struct device *dev, int addr)
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{
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return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
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}
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static int w1_ds2760_recall_eeprom(struct device *dev, int addr)
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{
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return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
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}
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static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
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{
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struct device *dev = kobj_to_dev(kobj);
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return w1_ds2760_read(dev, buf, off, count);
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}
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static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
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static struct bin_attribute *w1_ds2760_bin_attrs[] = {
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&bin_attr_w1_slave,
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NULL,
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};
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static const struct attribute_group w1_ds2760_group = {
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.bin_attrs = w1_ds2760_bin_attrs,
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};
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static const struct attribute_group *w1_ds2760_groups[] = {
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&w1_ds2760_group,
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NULL,
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};
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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->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->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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/* If the full_active_uAh value is not given, fall back to the rated
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* capacity. This is likely to happen when chips are not part of the
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* battery pack and is therefore not bootstrapped. */
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if (di->full_active_uAh == 0)
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di->full_active_uAh = di->rated_capacity / 1000L;
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scale[0] = di->full_active_uAh;
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for (i = 1; i < 5; i++)
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scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + 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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if (di->full_active_uAh == di->empty_uAh)
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di->rem_capacity = 0;
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else
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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 < -100L)
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di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
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/ (di->current_uA / 100L);
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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_set_current_accum(struct ds2760_device_info *di,
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unsigned int acr_val)
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{
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unsigned char acr[2];
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/* acr is in units of 0.25 mAh */
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acr_val *= 4L;
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acr_val /= 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->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
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dev_warn(di->dev, "ACR write failed\n");
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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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di->charge_status = POWER_SUPPLY_STATUS_FULL;
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ds2760_battery_set_current_accum(di,
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di->full_active_uAh);
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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_write_status(struct ds2760_device_info *di,
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char status)
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{
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if (status == di->raw[DS2760_STATUS_REG])
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return;
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w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1);
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w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
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w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
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}
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static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
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unsigned char rated_capacity)
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{
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if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
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return;
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w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
|
|
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
|
|
w1_ds2760_recall_eeprom(di->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->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
|
|
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
|
|
w1_ds2760_recall_eeprom(di->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->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
|
|
w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
|
|
w1_ds2760_recall_eeprom(di->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_pm_notifier(struct notifier_block *notifier,
|
|
unsigned long pm_event,
|
|
void *unused)
|
|
{
|
|
struct ds2760_device_info *di =
|
|
container_of(notifier, struct ds2760_device_info, pm_notifier);
|
|
|
|
switch (pm_event) {
|
|
case PM_HIBERNATION_PREPARE:
|
|
case PM_SUSPEND_PREPARE:
|
|
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
break;
|
|
|
|
case PM_POST_RESTORE:
|
|
case PM_POST_HIBERNATION:
|
|
case PM_POST_SUSPEND:
|
|
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
power_supply_changed(di->bat);
|
|
mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
|
|
|
|
break;
|
|
|
|
case PM_RESTORE_PREPARE:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int w1_ds2760_add_slave(struct w1_slave *sl)
|
|
{
|
|
struct power_supply_config psy_cfg = {};
|
|
struct ds2760_device_info *di;
|
|
struct device *dev = &sl->dev;
|
|
int retval = 0;
|
|
char name[32];
|
|
char status;
|
|
|
|
di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
|
|
if (!di) {
|
|
retval = -ENOMEM;
|
|
goto di_alloc_failed;
|
|
}
|
|
|
|
snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);
|
|
|
|
di->dev = dev;
|
|
di->bat_desc.name = name;
|
|
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;
|
|
|
|
if (dev->of_node) {
|
|
u32 tmp;
|
|
|
|
psy_cfg.of_node = dev->of_node;
|
|
|
|
if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled"))
|
|
pmod_enabled = true;
|
|
|
|
if (!of_property_read_u32(dev->of_node,
|
|
"maxim,cache-time-ms", &tmp))
|
|
cache_time = tmp;
|
|
|
|
if (!of_property_read_u32(dev->of_node,
|
|
"rated-capacity-microamp-hours",
|
|
&tmp))
|
|
rated_capacity = tmp / 10; /* property is in mAh */
|
|
}
|
|
|
|
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
|
|
|
|
sl->family_data = di;
|
|
|
|
/* 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 or device tree */
|
|
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(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 = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
|
|
if (!di->monitor_wqueue) {
|
|
retval = -ESRCH;
|
|
goto workqueue_failed;
|
|
}
|
|
queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
|
|
|
|
di->pm_notifier.notifier_call = ds2760_pm_notifier;
|
|
register_pm_notifier(&di->pm_notifier);
|
|
|
|
goto success;
|
|
|
|
workqueue_failed:
|
|
power_supply_unregister(di->bat);
|
|
batt_failed:
|
|
di_alloc_failed:
|
|
success:
|
|
return retval;
|
|
}
|
|
|
|
static void w1_ds2760_remove_slave(struct w1_slave *sl)
|
|
{
|
|
struct ds2760_device_info *di = sl->family_data;
|
|
|
|
unregister_pm_notifier(&di->pm_notifier);
|
|
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);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id w1_ds2760_of_ids[] = {
|
|
{ .compatible = "maxim,ds2760" },
|
|
{}
|
|
};
|
|
#endif
|
|
|
|
static const struct w1_family_ops w1_ds2760_fops = {
|
|
.add_slave = w1_ds2760_add_slave,
|
|
.remove_slave = w1_ds2760_remove_slave,
|
|
.groups = w1_ds2760_groups,
|
|
};
|
|
|
|
static struct w1_family w1_ds2760_family = {
|
|
.fid = W1_FAMILY_DS2760,
|
|
.fops = &w1_ds2760_fops,
|
|
.of_match_table = of_match_ptr(w1_ds2760_of_ids),
|
|
};
|
|
module_w1_family(w1_ds2760_family);
|
|
|
|
MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
|
|
"Matt Reimer <mreimer@vpop.net>, "
|
|
"Anton Vorontsov <cbou@mail.ru>");
|
|
MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));
|