[PATCH 2/3] w1: ds2760: add support for EEPROM read and write

Daniel Mack
2009-04-28T10:23:39Z

In order to modify the DS2762's status registers and to add support for
sleep mode, there is need for functions to write the internal EEPROM.

Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
Cc: Matt Reimer <mreimer@vpop.net>
Cc: Anton Vorontsov <cbou@mail.ru>
Signed-off-by: Daniel Mack <daniel@caiaq.de>
---
Ammended version with EXPORT_SYMBOL() for the two new functions.

drivers/w1/slaves/w1_ds2760.c | 30 ++++++++++++++++++++++++++++++
drivers/w1/slaves/w1_ds2760.h | 2 ++
2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c
index 1f09d4e..59f708e 100644
--- a/drivers/w1/slaves/w1_ds2760.c
+++ b/drivers/w1/slaves/w1_ds2760.c
@@ -68,6 +68,34 @@ 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->mutex);
+
+ if (w1_reset_select_slave(sl) == 0) {
+ w1_write_8(sl->master, cmd);
+ w1_write_8(sl->master, addr);
+ }
+
+ mutex_unlock(&sl->master->mutex);
+ return 0;
+}
+
+int w1_ds2760_store_eeprom(struct device *dev, int addr)
+{
+ return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
+}
+
+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_ds2760_read_bin(struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
@@ -200,6 +228,8 @@ static void __exit w1_ds2760_exit(void)

EXPORT_SYMBOL(w1_ds2760_read);
EXPORT_SYMBOL(w1_ds2760_write);
+EXPORT_SYMBOL(w1_ds2760_store_eeprom);
+EXPORT_SYMBOL(w1_ds2760_recall_eeprom);

module_init(w1_ds2760_init);
module_exit(w1_ds2760_exit);
diff --git a/drivers/w1/slaves/w1_ds2760.h b/drivers/w1/slaves/w1_ds2760.h
index f130242..ea39419 100644
--- a/drivers/w1/slaves/w1_ds2760.h
+++ b/drivers/w1/slaves/w1_ds2760.h
@@ -46,5 +46,7 @@ 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__ */
--
1.6.2.1