Messages in this thread Patch in this message |  | | | From | Daniel Mack <> | | Subject | [PATCH 2/3] w1: ds2760: add support for EEPROM read and write | | Date | Tue, 28 Apr 2009 12:22:39 +0200 |
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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.
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
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