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authorClifton Barnes <cabarnes@indesign-llc.com>2011-11-02 13:39:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 16:07:03 -0700
commit9fe678fa2feb4aaac0b4220de63e1b7f8ccebae6 (patch)
tree2960251be84e19f289b1263f018cf33d95da4a95 /drivers/w1/slaves/w1_ds2780.c
parent853eee72f74f449797f0500ea19fc1bf497428d8 (diff)
downloadlinux-9fe678fa2feb4aaac0b4220de63e1b7f8ccebae6.tar.gz
drivers/power/ds2780_battery.c: add a nolock function to w1 interface
Adds a nolock function to the w1 interface to avoid locking the mutex if needed. Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com> Cc: Evgeniy Polyakov <zbr@ioremap.net> Cc: <stable@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/w1/slaves/w1_ds2780.c')
-rw-r--r--drivers/w1/slaves/w1_ds2780.c48
1 files changed, 35 insertions, 13 deletions
diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
index a134b38e34b..39f78c0b143 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);