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w1: ds2760: add support for EEPROM read and write

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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.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Matt Reimer <mreimer@vpop.net>
Acked-by: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Daniel Mack 2009-04-28 10:55:01 +02:00 committed by Anton Vorontsov
parent ae9fb6e814
commit 0b47b5703b
2 changed files with 32 additions and 0 deletions
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30
drivers/w1/slaves/w1_ds2760.c
View file

@ -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);

2
drivers/w1/slaves/w1_ds2760.h
View file

@ -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__ */