[PATCH v4 4/5] power: supply: ds2760_battery: merge ds2760 supply driver with its w1 slave companion

From: Daniel Mack
Date: Fri Jul 06 2018 - 01:36:41 EST

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@xxxxxxxxxx>
---
drivers/power/supply/Kconfig | 2 +-
drivers/power/supply/ds2760_battery.c | 321 ++++++++++++++++++--------
drivers/w1/slaves/Kconfig | 12 -
drivers/w1/slaves/Makefile | 1 -
drivers/w1/slaves/w1_ds2760.c | 175 --------------
drivers/w1/slaves/w1_ds2760.h | 59 -----
6 files changed, 232 insertions(+), 338 deletions(-)
delete mode 100644 drivers/w1/slaves/w1_ds2760.c
delete mode 100644 drivers/w1/slaves/w1_ds2760.h

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 428b426842f4..518a88c4adfa 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -92,7 +92,7 @@ config BATTERY_CPCAP

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

diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c
index ae180dc929c9..aa406a7c65a1 100644
--- a/drivers/power/supply/ds2760_battery.c
+++ b/drivers/power/supply/ds2760_battery.c
@@ -27,9 +27,63 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
-
+#include <linux/suspend.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 device *dev;
@@ -55,28 +109,113 @@ struct ds2760_device_info {
int full_counter;
struct power_supply *bat;
struct power_supply_desc bat_desc;
- struct device *w1_dev;
struct workqueue_struct *monitor_wqueue;
struct delayed_work monitor_work;
struct delayed_work set_charged_work;
+ struct notifier_block pm_notifier;
};

-static unsigned int cache_time = 1000;
-module_param(cache_time, uint, 0644);
-MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+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);

-static bool pmod_enabled;
-module_param(pmod_enabled, bool, 0644);
-MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
+ if (!dev)
+ return 0;

-static unsigned int rated_capacity;
-module_param(rated_capacity, uint, 0644);
-MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
+ mutex_lock(&sl->master->bus_mutex);

-static unsigned int current_accum;
-module_param(current_accum, uint, 0644);
-MODULE_PARM_DESC(current_accum, "current accumulator value");
+ 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 = 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
* others use an index into this table. */
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;
}

- 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) {
dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
- di->w1_dev);
+ di->dev);
return 1;
}

@@ -242,7 +381,7 @@ static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
acr[0] = acr_val >> 8;
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");
}

@@ -297,9 +436,9 @@ static void ds2760_battery_write_status(struct ds2760_device_info *di,
if (status == di->raw[DS2760_STATUS_REG])
return;

- w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
- w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
- w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
+ 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,
@@ -308,9 +447,9 @@ static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
return;

- w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
- w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
- w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
+ 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,
@@ -325,9 +464,9 @@ static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
return;

- w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
- w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
- w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
+ 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() */
@@ -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);

- w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
- w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
- w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
+ 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() */
@@ -504,24 +643,55 @@ static enum power_supply_property ds2760_battery_props[] = {
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 = {};
- char status;
- int retval = 0;
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) {
retval = -ENOMEM;
goto di_alloc_failed;
}

- platform_set_drvdata(pdev, di);
+ snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);

- di->dev = &pdev->dev;
- di->w1_dev = pdev->dev.parent;
- di->bat_desc.name = dev_name(&pdev->dev);
+ 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);
@@ -533,10 +703,12 @@ static int ds2760_battery_probe(struct platform_device *pdev)
di->bat_desc.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;

+ sl->family_data = di;
+
/* enable sleep mode feature */
ds2760_battery_read_status(di);
status = di->raw[DS2760_STATUS_REG];
@@ -556,7 +728,7 @@ static int ds2760_battery_probe(struct platform_device *pdev)
if (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)) {
dev_err(di->dev, "failed to register battery\n");
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->set_charged_work,
ds2760_battery_set_charged_work);
- di->monitor_wqueue = alloc_ordered_workqueue(dev_name(&pdev->dev),
- WQ_MEM_RECLAIM);
+ 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:
@@ -584,65 +758,32 @@ static int ds2760_battery_probe(struct platform_device *pdev)
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->set_charged_work);
destroy_workqueue(di->monitor_wqueue);
power_supply_unregister(di->bat);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-
-static int ds2760_battery_suspend(struct platform_device *pdev,
- pm_message_t state)
-{
- struct ds2760_device_info *di = platform_get_drvdata(pdev);
-
- di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
-
- return 0;
-}
-
-static int ds2760_battery_resume(struct platform_device *pdev)
-{
- struct ds2760_device_info *di = platform_get_drvdata(pdev);
-
- di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
- power_supply_changed(di->bat);
-
- 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,
+static struct w1_family_ops w1_ds2760_fops = {
+ .add_slave = w1_ds2760_add_slave,
+ .remove_slave = w1_ds2760_remove_slave,
+ .groups = w1_ds2760_groups,
};

-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@xxxxxx>, "
"Matt Reimer <mreimer@xxxxxxxx>, "
"Anton Vorontsov <cbou@xxxxxxx>");
-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));
diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index 7931231d8e80..e22fdeddada1 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -100,18 +100,6 @@ config W1_SLAVE_DS2438
Say Y here if you want to use a 1-wire
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
tristate "Dallas 2780 battery monitor chip"
help
diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index d5f4f4d5b9e5..eab29f151413 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -14,7 +14,6 @@ obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
obj-$(CONFIG_W1_SLAVE_DS2805) += w1_ds2805.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2438) += w1_ds2438.o
-obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o
obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o
obj-$(CONFIG_W1_SLAVE_DS28E04) += w1_ds28e04.o
diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c
deleted file mode 100644
index 26168abfb8b8..000000000000
--- a/drivers/w1/slaves/w1_ds2760.c
+++ /dev/null
@@ -1,175 +0,0 @@
-/*
- * 1-Wire implementation for the ds2760 chip
- *
- * Copyright  2004-2005, Szabolcs Gyurko <szabolcs.gyurko@xxxxxx>
- *
- * 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@xxxxxx>");
-MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));
diff --git a/drivers/w1/slaves/w1_ds2760.h b/drivers/w1/slaves/w1_ds2760.h
deleted file mode 100644
index 24168c94eeae..000000000000
--- a/drivers/w1/slaves/w1_ds2760.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * 1-Wire implementation for the ds2760 chip
- *
- * Copyright  2004-2005, Szabolcs Gyurko <szabolcs.gyurko@xxxxxx>
- *
- * 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__ */
--
2.17.1