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816 lines
22 KiB
816 lines
22 KiB
/* |
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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 <[email protected]> |
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* February 2007 |
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* |
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* Matt Reimer <[email protected]> |
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* April 2004, 2005, 2007 |
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* |
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* Szabolcs Gyurko <[email protected]> |
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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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|
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#define W1_FAMILY_DS2760 0x30 |
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|
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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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|
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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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|
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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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#ifdef CONFIG_MACH_H4700 |
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1800, /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */ |
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#else |
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1440, /* Lishen */ |
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#endif |
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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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#ifdef CONFIG_MACH_H4700 |
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0, |
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3600, /* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */ |
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#endif |
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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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|
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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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|
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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); |
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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_active_full(struct ds2760_device_info *di, |
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int active_full) |
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{ |
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unsigned char tmp[2] = { |
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active_full >> 8, |
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active_full & 0xff |
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}; |
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if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && |
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tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) |
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return; |
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w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); |
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w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0); |
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w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0); |
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|
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/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL |
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* values won't be read back by ds2760_battery_read_status() */ |
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di->raw[DS2760_ACTIVE_FULL] = tmp[0]; |
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di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; |
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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", __func__); |
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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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static void ds2760_battery_external_power_changed(struct power_supply *psy) |
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{ |
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struct ds2760_device_info *di = power_supply_get_drvdata(psy); |
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dev_dbg(di->dev, "%s\n", __func__); |
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mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); |
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} |
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static void ds2760_battery_set_charged_work(struct work_struct *work) |
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{ |
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char bias; |
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struct ds2760_device_info *di = container_of(work, |
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struct ds2760_device_info, set_charged_work.work); |
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|
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dev_dbg(di->dev, "%s\n", __func__); |
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|
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ds2760_battery_read_status(di); |
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|
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/* When we get notified by external circuitry that the battery is |
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* considered fully charged now, we know that there is no current |
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* 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 <[email protected]>, " |
|
"Matt Reimer <[email protected]>, " |
|
"Anton Vorontsov <[email protected]>"); |
|
MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));
|
|
|