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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/power/supply/ds2760_battery.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/power/supply/ds2760_battery.c')
-rw-r--r--drivers/power/supply/ds2760_battery.c808
1 files changed, 808 insertions, 0 deletions
diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c
new file mode 100644
index 0000000000..40fba31be1
--- /dev/null
+++ b/drivers/power/supply/ds2760_battery.c
@@ -0,0 +1,808 @@
+/*
+ * 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 <linux/suspend.h>
+#include <linux/w1.h>
+#include <linux/of.h>
+
+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");
+
+#define W1_FAMILY_DS2760 0x30
+
+/* Known commands to the DS2760 chip */
+#define W1_DS2760_SWAP 0xAA
+#define W1_DS2760_READ_DATA 0x69
+#define W1_DS2760_WRITE_DATA 0x6C
+#define W1_DS2760_COPY_DATA 0x48
+#define W1_DS2760_RECALL_DATA 0xB8
+#define W1_DS2760_LOCK 0x6A
+
+/* Number of valid register addresses */
+#define DS2760_DATA_SIZE 0x40
+
+#define DS2760_PROTECTION_REG 0x00
+
+#define DS2760_STATUS_REG 0x01
+#define DS2760_STATUS_IE (1 << 2)
+#define DS2760_STATUS_SWEN (1 << 3)
+#define DS2760_STATUS_RNAOP (1 << 4)
+#define DS2760_STATUS_PMOD (1 << 5)
+
+#define DS2760_EEPROM_REG 0x07
+#define DS2760_SPECIAL_FEATURE_REG 0x08
+#define DS2760_VOLTAGE_MSB 0x0c
+#define DS2760_VOLTAGE_LSB 0x0d
+#define DS2760_CURRENT_MSB 0x0e
+#define DS2760_CURRENT_LSB 0x0f
+#define DS2760_CURRENT_ACCUM_MSB 0x10
+#define DS2760_CURRENT_ACCUM_LSB 0x11
+#define DS2760_TEMP_MSB 0x18
+#define DS2760_TEMP_LSB 0x19
+#define DS2760_EEPROM_BLOCK0 0x20
+#define DS2760_ACTIVE_FULL 0x20
+#define DS2760_EEPROM_BLOCK1 0x30
+#define DS2760_STATUS_WRITE_REG 0x31
+#define DS2760_RATED_CAPACITY 0x32
+#define DS2760_CURRENT_OFFSET_BIAS 0x33
+#define DS2760_ACTIVE_EMPTY 0x3b
+
+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 workqueue_struct *monitor_wqueue;
+ struct delayed_work monitor_work;
+ struct delayed_work set_charged_work;
+ struct notifier_block pm_notifier;
+};
+
+static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
+ int io)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+ if (!dev)
+ return 0;
+
+ mutex_lock(&sl->master->bus_mutex);
+
+ if (addr > DS2760_DATA_SIZE || addr < 0) {
+ count = 0;
+ goto out;
+ }
+ if (addr + count > DS2760_DATA_SIZE)
+ count = DS2760_DATA_SIZE - addr;
+
+ if (!w1_reset_select_slave(sl)) {
+ if (!io) {
+ w1_write_8(sl->master, W1_DS2760_READ_DATA);
+ w1_write_8(sl->master, addr);
+ count = w1_read_block(sl->master, buf, count);
+ } else {
+ w1_write_8(sl->master, W1_DS2760_WRITE_DATA);
+ w1_write_8(sl->master, addr);
+ w1_write_block(sl->master, buf, count);
+ /* XXX w1_write_block returns void, not n_written */
+ }
+ }
+
+out:
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return count;
+}
+
+static int w1_ds2760_read(struct device *dev,
+ char *buf, int addr,
+ size_t count)
+{
+ return w1_ds2760_io(dev, buf, addr, count, 0);
+}
+
+static int w1_ds2760_write(struct device *dev,
+ char *buf,
+ int addr, size_t count)
+{
+ return w1_ds2760_io(dev, buf, addr, count, 1);
+}
+
+static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+ if (!dev)
+ return -EINVAL;
+
+ mutex_lock(&sl->master->bus_mutex);
+
+ if (w1_reset_select_slave(sl) == 0) {
+ w1_write_8(sl->master, cmd);
+ w1_write_8(sl->master, addr);
+ }
+
+ mutex_unlock(&sl->master->bus_mutex);
+ return 0;
+}
+
+static int w1_ds2760_store_eeprom(struct device *dev, int addr)
+{
+ return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
+}
+
+static int w1_ds2760_recall_eeprom(struct device *dev, int addr)
+{
+ return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
+}
+
+static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ return w1_ds2760_read(dev, buf, off, count);
+}
+
+static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
+
+static struct bin_attribute *w1_ds2760_bin_attrs[] = {
+ &bin_attr_w1_slave,
+ NULL,
+};
+
+static const struct attribute_group w1_ds2760_group = {
+ .bin_attrs = w1_ds2760_bin_attrs,
+};
+
+static const struct attribute_group *w1_ds2760_groups[] = {
+ &w1_ds2760_group,
+ NULL,
+};
+/* 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 */
+ 1440, /* Lishen */
+ 1440, /* NEC */
+ 2880, /* Samsung */
+ 2880, /* BYD */
+ 2880, /* Lishen */
+ 2880, /* NEC */
+};
+
+/* 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->dev, di->raw + start, start, count);
+ if (ret != count) {
+ dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
+ di->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->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->dev, &status, DS2760_STATUS_WRITE_REG, 1);
+ w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
+ w1_ds2760_recall_eeprom(di->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->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));