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power: supply: ds2760_battery: merge ds2760 supply driver with its w1 slave companion 

This patch removes the w1 slave driver that used to register the w1 family
and instanciate a platform device at runtime. The code now lives in the
supply driver instead to avoid that level of indirection.

The old device name "ds2760-battery.0" is preserved, so userspace
applications can access the same virtual device nodes as before.

Note that because the w1 core does not currently have a framework for
suspend/resume, the driver now registers a PM notifier callback.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Daniel Mack 2018-07-06 07:35:51 +02:00 committed by Sebastian Reichel
parent fae68031f7
commit bf49735537
6 changed files with 232 additions and 338 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/power/supply/Kconfig
View File

@ -92,7 +92,7 @@ config BATTERY_CPCAP
config BATTERY_DS2760 config BATTERY_DS2760
tristate "DS2760 battery driver (HP iPAQ & others)" tristate "DS2760 battery driver (HP iPAQ & others)"
depends on W1 && W1_SLAVE_DS2760 depends on W1
help help
Say Y here to enable support for batteries with ds2760 chip. Say Y here to enable support for batteries with ds2760 chip.

321
drivers/power/supply/ds2760_battery.c
View File

@ -27,9 +27,63 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/power_supply.h> #include <linux/power_supply.h>
#include <linux/suspend.h>
#include <linux/w1.h> #include <linux/w1.h>
#include "../../w1/slaves/w1_ds2760.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 ds2760_device_info {
struct device *dev; struct device *dev;
@ -55,28 +109,113 @@ struct ds2760_device_info {
int full_counter; int full_counter;
struct power_supply *bat; struct power_supply *bat;
struct power_supply_desc bat_desc; struct power_supply_desc bat_desc;
struct device *w1_dev;
struct workqueue_struct *monitor_wqueue; struct workqueue_struct *monitor_wqueue;
struct delayed_work monitor_work; struct delayed_work monitor_work;
struct delayed_work set_charged_work; struct delayed_work set_charged_work;
struct notifier_block pm_notifier;
}; };
static unsigned int cache_time = 1000; static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
module_param(cache_time, uint, 0644); int io)
MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); {
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
static bool pmod_enabled; if (!dev)
module_param(pmod_enabled, bool, 0644); return 0;
MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
static unsigned int rated_capacity; mutex_lock(&sl->master->bus_mutex);
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
static unsigned int current_accum; if (addr > DS2760_DATA_SIZE || addr < 0) {
module_param(current_accum, uint, 0644); count = 0;
MODULE_PARM_DESC(current_accum, "current accumulator value"); 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 = container_of(kobj, struct device, 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 /* Some batteries have their rated capacity stored a N * 10 mAh, while
* others use an index into this table. */ * others use an index into this table. */
static int rated_capacities[] = { static int rated_capacities[] = {
@ -138,10 +277,10 @@ static int ds2760_battery_read_status(struct ds2760_device_info *di)
count = DS2760_TEMP_LSB - start + 1; count = DS2760_TEMP_LSB - start + 1;
} }
ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count); ret = w1_ds2760_read(di->dev, di->raw + start, start, count);
if (ret != count) { if (ret != count) {
dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
di->w1_dev); di->dev);
return 1; return 1;
} }
@ -242,7 +381,7 @@ static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
acr[0] = acr_val >> 8; acr[0] = acr_val >> 8;
acr[1] = acr_val & 0xff; acr[1] = acr_val & 0xff;
if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) if (w1_ds2760_write(di->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
dev_warn(di->dev, "ACR write failed\n"); dev_warn(di->dev, "ACR write failed\n");
} }
@ -297,9 +436,9 @@ static void ds2760_battery_write_status(struct ds2760_device_info *di,
if (status == di->raw[DS2760_STATUS_REG]) if (status == di->raw[DS2760_STATUS_REG])
return; return;
w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1);
w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->w1_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, static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
@ -308,9 +447,9 @@ static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
return; return;
w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->w1_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, static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
@ -325,9 +464,9 @@ static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
return; return;
w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
* values won't be read back by ds2760_battery_read_status() */ * values won't be read back by ds2760_battery_read_status() */
@ -383,9 +522,9 @@ static void ds2760_battery_set_charged_work(struct work_struct *work)
dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); w1_ds2760_write(di->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
/* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
* value won't be read back by ds2760_battery_read_status() */ * value won't be read back by ds2760_battery_read_status() */
@ -504,24 +643,55 @@ static enum power_supply_property ds2760_battery_props[] = {
POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_CAPACITY,
}; };
static int ds2760_battery_probe(struct platform_device *pdev) 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 power_supply_config psy_cfg = {};
char status;
int retval = 0;
struct ds2760_device_info *di; struct ds2760_device_info *di;
struct device *dev = &sl->dev;
int retval = 0;
char name[32];
char status;
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
if (!di) { if (!di) {
retval = -ENOMEM; retval = -ENOMEM;
goto di_alloc_failed; goto di_alloc_failed;
} }
platform_set_drvdata(pdev, di); snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);
di->dev = &pdev->dev; di->dev = dev;
di->w1_dev = pdev->dev.parent; di->bat_desc.name = name;
di->bat_desc.name = dev_name(&pdev->dev);
di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat_desc.properties = ds2760_battery_props; di->bat_desc.properties = ds2760_battery_props;
di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props);
@ -533,10 +703,12 @@ static int ds2760_battery_probe(struct platform_device *pdev)
di->bat_desc.external_power_changed = di->bat_desc.external_power_changed =
ds2760_battery_external_power_changed; ds2760_battery_external_power_changed;
psy_cfg.drv_data = di; psy_cfg.drv_data = di;
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
sl->family_data = di;
/* enable sleep mode feature */ /* enable sleep mode feature */
ds2760_battery_read_status(di); ds2760_battery_read_status(di);
status = di->raw[DS2760_STATUS_REG]; status = di->raw[DS2760_STATUS_REG];
@ -556,7 +728,7 @@ static int ds2760_battery_probe(struct platform_device *pdev)
if (current_accum) if (current_accum)
ds2760_battery_set_current_accum(di, current_accum); ds2760_battery_set_current_accum(di, current_accum);
di->bat = power_supply_register(&pdev->dev, &di->bat_desc, &psy_cfg); di->bat = power_supply_register(dev, &di->bat_desc, &psy_cfg);
if (IS_ERR(di->bat)) { if (IS_ERR(di->bat)) {
dev_err(di->dev, "failed to register battery\n"); dev_err(di->dev, "failed to register battery\n");
retval = PTR_ERR(di->bat); retval = PTR_ERR(di->bat);
@ -566,14 +738,16 @@ static int ds2760_battery_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
INIT_DELAYED_WORK(&di->set_charged_work, INIT_DELAYED_WORK(&di->set_charged_work,
ds2760_battery_set_charged_work); ds2760_battery_set_charged_work);
di->monitor_wqueue = alloc_ordered_workqueue(dev_name(&pdev->dev), di->monitor_wqueue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
WQ_MEM_RECLAIM);
if (!di->monitor_wqueue) { if (!di->monitor_wqueue) {
retval = -ESRCH; retval = -ESRCH;
goto workqueue_failed; goto workqueue_failed;
} }
queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); 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; goto success;
workqueue_failed: workqueue_failed:
@ -584,65 +758,32 @@ success:
return retval; return retval;
} }
static int ds2760_battery_remove(struct platform_device *pdev) static void w1_ds2760_remove_slave(struct w1_slave *sl)
{ {
struct ds2760_device_info *di = platform_get_drvdata(pdev); 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->monitor_work);
cancel_delayed_work_sync(&di->set_charged_work); cancel_delayed_work_sync(&di->set_charged_work);
destroy_workqueue(di->monitor_wqueue); destroy_workqueue(di->monitor_wqueue);
power_supply_unregister(di->bat); power_supply_unregister(di->bat);
return 0;
} }
#ifdef CONFIG_PM static struct w1_family_ops w1_ds2760_fops = {
.add_slave = w1_ds2760_add_slave,
static int ds2760_battery_suspend(struct platform_device *pdev, .remove_slave = w1_ds2760_remove_slave,
pm_message_t state) .groups = w1_ds2760_groups,
{
struct ds2760_device_info *di = platform_get_drvdata(pdev);
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
static int ds2760_battery_resume(struct platform_device *pdev)
{
struct ds2760_device_info *di = platform_get_drvdata(pdev);
di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
power_supply_changed(di->bat);
mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
return 0;
}
#else
#define ds2760_battery_suspend NULL
#define ds2760_battery_resume NULL
#endif /* CONFIG_PM */
MODULE_ALIAS("platform:ds2760-battery");
static struct platform_driver ds2760_battery_driver = {
.driver = {
.name = "ds2760-battery",
},
.probe = ds2760_battery_probe,
.remove = ds2760_battery_remove,
.suspend = ds2760_battery_suspend,
.resume = ds2760_battery_resume,
}; };
module_platform_driver(ds2760_battery_driver); static struct w1_family w1_ds2760_family = {
.fid = W1_FAMILY_DS2760,
.fops = &w1_ds2760_fops,
};
module_w1_family(w1_ds2760_family);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
"Matt Reimer <mreimer@vpop.net>, " "Matt Reimer <mreimer@vpop.net>, "
"Anton Vorontsov <cbou@mail.ru>"); "Anton Vorontsov <cbou@mail.ru>");
MODULE_DESCRIPTION("ds2760 battery driver"); MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));

12
drivers/w1/slaves/Kconfig
View File

@ -100,18 +100,6 @@ config W1_SLAVE_DS2438
Say Y here if you want to use a 1-wire Say Y here if you want to use a 1-wire
DS2438 Smart Battery Monitor device support DS2438 Smart Battery Monitor device support
config W1_SLAVE_DS2760
tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)"
help
If you enable this you will have the DS2760 battery monitor
chip support.
The battery monitor chip is used in many batteries/devices
as the one who is responsible for charging/discharging/monitoring
Li+ batteries.
If you are unsure, say N.
config W1_SLAVE_DS2780 config W1_SLAVE_DS2780
tristate "Dallas 2780 battery monitor chip" tristate "Dallas 2780 battery monitor chip"
help help

1
drivers/w1/slaves/Makefile
View File

@ -14,7 +14,6 @@ obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
obj-$(CONFIG_W1_SLAVE_DS2805) += w1_ds2805.o obj-$(CONFIG_W1_SLAVE_DS2805) += w1_ds2805.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2438) += w1_ds2438.o obj-$(CONFIG_W1_SLAVE_DS2438) += w1_ds2438.o
obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o
obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o
obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o

175
drivers/w1/slaves/w1_ds2760.c
View File

@ -1,175 +0,0 @@
/*
* 1-Wire implementation for the ds2760 chip
*
* Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
*
* Use consistent with the GNU GPL is permitted,
* provided that this copyright notice is
* preserved in its entirety in all copies and derived works.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/idr.h>
#include <linux/gfp.h>
#include <linux/w1.h>
#include "w1_ds2760.h"
#define W1_FAMILY_DS2760 0x30
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;
}
int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count)
{
return w1_ds2760_io(dev, buf, addr, count, 0);
}
EXPORT_SYMBOL(w1_ds2760_read);
int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count)
{
return w1_ds2760_io(dev, buf, addr, count, 1);
}
EXPORT_SYMBOL(w1_ds2760_write);
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;
}
int w1_ds2760_store_eeprom(struct device *dev, int addr)
{
return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
}
EXPORT_SYMBOL(w1_ds2760_store_eeprom);
int w1_ds2760_recall_eeprom(struct device *dev, int addr)
{
return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
}
EXPORT_SYMBOL(w1_ds2760_recall_eeprom);
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 = container_of(kobj, struct device, 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,
};
static int w1_ds2760_add_slave(struct w1_slave *sl)
{
int ret;
struct platform_device *pdev;
pdev = platform_device_alloc("ds2760-battery", PLATFORM_DEVID_AUTO);
if (!pdev)
return -ENOMEM;
pdev->dev.parent = &sl->dev;
ret = platform_device_add(pdev);
if (ret)
goto pdev_add_failed;
dev_set_drvdata(&sl->dev, pdev);
return 0;
pdev_add_failed:
platform_device_put(pdev);
return ret;
}
static void w1_ds2760_remove_slave(struct w1_slave *sl)
{
struct platform_device *pdev = dev_get_drvdata(&sl->dev);
platform_device_unregister(pdev);
}
static 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,
};
module_w1_family(w1_ds2760_family);
MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>");
MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));

59
drivers/w1/slaves/w1_ds2760.h
View File

@ -1,59 +0,0 @@
/*
* 1-Wire implementation for the ds2760 chip
*
* Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
*
* Use consistent with the GNU GPL is permitted,
* provided that this copyright notice is
* preserved in its entirety in all copies and derived works.
*
*/
#ifndef __w1_ds2760_h__
#define __w1_ds2760_h__
/* 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
extern int w1_ds2760_read(struct device *dev, char *buf, int addr,
size_t count);
extern int w1_ds2760_write(struct device *dev, char *buf, int addr,
size_t count);
extern int w1_ds2760_store_eeprom(struct device *dev, int addr);
extern int w1_ds2760_recall_eeprom(struct device *dev, int addr);
#endif /* !__w1_ds2760_h__ */