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path: root/drivers/w1/slaves/w1_ds2780.c
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Diffstat (limited to 'drivers/w1/slaves/w1_ds2780.c')
-rw-r--r--drivers/w1/slaves/w1_ds2780.c96
1 files changed, 41 insertions, 55 deletions
diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
index 274c8f38303f..39f78c0b143c 100644
--- a/drivers/w1/slaves/w1_ds2780.c
+++ b/drivers/w1/slaves/w1_ds2780.c
@@ -26,20 +26,14 @@
#include "../w1_family.h"
#include "w1_ds2780.h"
-int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
- int io)
+static int w1_ds2780_do_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 -ENODEV;
+ if (addr > DS2780_DATA_SIZE || addr < 0)
+ return 0;
- mutex_lock(&sl->master->mutex);
-
- if (addr > DS2780_DATA_SIZE || addr < 0) {
- count = 0;
- goto out;
- }
count = min_t(int, count, DS2780_DATA_SIZE - addr);
if (w1_reset_select_slave(sl) == 0) {
@@ -47,7 +41,6 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
w1_write_8(sl->master, addr);
w1_write_block(sl->master, buf, count);
- /* XXX w1_write_block returns void, not n_written */
} else {
w1_write_8(sl->master, W1_DS2780_READ_DATA);
w1_write_8(sl->master, addr);
@@ -55,13 +48,42 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
}
}
-out:
+ return count;
+}
+
+int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
+ int io)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ int ret;
+
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&sl->master->mutex);
+
+ ret = w1_ds2780_do_io(dev, buf, addr, count, io);
+
mutex_unlock(&sl->master->mutex);
- return count;
+ return ret;
}
EXPORT_SYMBOL(w1_ds2780_io);
+int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr, size_t count,
+ int io)
+{
+ int ret;
+
+ if (!dev)
+ return -ENODEV;
+
+ ret = w1_ds2780_do_io(dev, buf, addr, count, io);
+
+ return ret;
+}
+EXPORT_SYMBOL(w1_ds2780_io_nolock);
+
int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
@@ -99,43 +121,7 @@ static struct bin_attribute w1_ds2780_bin_attr = {
.read = w1_ds2780_read_bin,
};
-static DEFINE_IDR(bat_idr);
-static DEFINE_MUTEX(bat_idr_lock);
-
-static int new_bat_id(void)
-{
- int ret;
-
- while (1) {
- int id;
-
- ret = idr_pre_get(&bat_idr, GFP_KERNEL);
- if (ret == 0)
- return -ENOMEM;
-
- mutex_lock(&bat_idr_lock);
- ret = idr_get_new(&bat_idr, NULL, &id);
- mutex_unlock(&bat_idr_lock);
-
- if (ret == 0) {
- ret = id & MAX_ID_MASK;
- break;
- } else if (ret == -EAGAIN) {
- continue;
- } else {
- break;
- }
- }
-
- return ret;
-}
-
-static void release_bat_id(int id)
-{
- mutex_lock(&bat_idr_lock);
- idr_remove(&bat_idr, id);
- mutex_unlock(&bat_idr_lock);
-}
+static DEFINE_IDA(bat_ida);
static int w1_ds2780_add_slave(struct w1_slave *sl)
{
@@ -143,7 +129,7 @@ static int w1_ds2780_add_slave(struct w1_slave *sl)
int id;
struct platform_device *pdev;
- id = new_bat_id();
+ id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
ret = id;
goto noid;
@@ -172,7 +158,7 @@ bin_attr_failed:
pdev_add_failed:
platform_device_unregister(pdev);
pdev_alloc_failed:
- release_bat_id(id);
+ ida_simple_remove(&bat_ida, id);
noid:
return ret;
}
@@ -183,7 +169,7 @@ static void w1_ds2780_remove_slave(struct w1_slave *sl)
int id = pdev->id;
platform_device_unregister(pdev);
- release_bat_id(id);
+ ida_simple_remove(&bat_ida, id);
sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr);
}
@@ -199,14 +185,14 @@ static struct w1_family w1_ds2780_family = {
static int __init w1_ds2780_init(void)
{
- idr_init(&bat_idr);
+ ida_init(&bat_ida);
return w1_register_family(&w1_ds2780_family);
}
static void __exit w1_ds2780_exit(void)
{
w1_unregister_family(&w1_ds2780_family);
- idr_destroy(&bat_idr);
+ ida_destroy(&bat_ida);
}
module_init(w1_ds2780_init);