tree 1e687c32d53a92c10a61fb23ab14763459ff5779 parent db2d0008de519c5db6baec45f7831e08790301cf author Evgeniy Polyakov <[EMAIL PROTECTED]> Thu, 11 Aug 2005 17:27:49 +0400 committer Greg Kroah-Hartman <[EMAIL PROTECTED]> Fri, 09 Sep 2005 04:41:26 -0700
[PATCH] w1: Added w1_reset_select_slave() - Resets the bus and then selects the slave by sending either a skip rom or a rom match. Patch from Ben Gardner <[EMAIL PROTECTED]> Signed-off-by: Evgeniy Polyakov <[EMAIL PROTECTED]> Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]> drivers/w1/w1_io.c | 24 ++++++++++++++++++++++++ drivers/w1/w1_io.h | 1 + drivers/w1/w1_therm.c | 11 ++--------- 3 files changed, 27 insertions(+), 9 deletions(-) diff --git a/drivers/w1/w1_io.c b/drivers/w1/w1_io.c --- a/drivers/w1/w1_io.c +++ b/drivers/w1/w1_io.c @@ -277,6 +277,29 @@ void w1_search_devices(struct w1_master w1_search(dev, cb); } +/** + * Resets the bus and then selects the slave by sending either a skip rom + * or a rom match. + * The w1 master lock must be held. + * + * @param sl the slave to select + * @return 0=success, anything else=error + */ +int w1_reset_select_slave(struct w1_slave *sl) +{ + if (w1_reset_bus(sl->master)) + return -1; + + if (sl->master->slave_count == 1) + w1_write_8(sl->master, W1_SKIP_ROM); + else { + u8 match[9] = {W1_MATCH_ROM, }; + memcpy(&match[1], (u8 *)&sl->reg_num, 8); + w1_write_block(sl->master, match, 9); + } + return 0; +} + EXPORT_SYMBOL(w1_touch_bit); EXPORT_SYMBOL(w1_write_8); EXPORT_SYMBOL(w1_read_8); @@ -286,3 +309,4 @@ EXPORT_SYMBOL(w1_delay); EXPORT_SYMBOL(w1_read_block); EXPORT_SYMBOL(w1_write_block); EXPORT_SYMBOL(w1_search_devices); +EXPORT_SYMBOL(w1_reset_select_slave); diff --git a/drivers/w1/w1_io.h b/drivers/w1/w1_io.h --- a/drivers/w1/w1_io.h +++ b/drivers/w1/w1_io.h @@ -34,5 +34,6 @@ u8 w1_calc_crc8(u8 *, int); void w1_write_block(struct w1_master *, const u8 *, int); u8 w1_read_block(struct w1_master *, u8 *, int); void w1_search_devices(struct w1_master *dev, w1_slave_found_callback cb); +int w1_reset_select_slave(struct w1_slave *sl); #endif /* __W1_IO_H */ diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c --- a/drivers/w1/w1_therm.c +++ b/drivers/w1/w1_therm.c @@ -176,15 +176,10 @@ static ssize_t w1_therm_read_bin(struct crc = 0; while (max_trying--) { - if (!w1_reset_bus (dev)) { + if (!w1_reset_select_slave(sl)) { int count = 0; - u8 match[9] = {W1_MATCH_ROM, }; unsigned int tm = 750; - memcpy(&match[1], (u64 *) & sl->reg_num, 8); - - w1_write_block(dev, match, 9); - w1_write_8(dev, W1_CONVERT_TEMP); while (tm) { @@ -193,8 +188,7 @@ static ssize_t w1_therm_read_bin(struct flush_signals(current); } - if (!w1_reset_bus (dev)) { - w1_write_block(dev, match, 9); + if (!w1_reset_select_slave(sl)) { w1_write_8(dev, W1_READ_SCRATCHPAD); if ((count = w1_read_block(dev, rom, 9)) != 9) { @@ -205,7 +199,6 @@ static ssize_t w1_therm_read_bin(struct if (rom[8] == crc && rom[0]) verdict = 1; - } } - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html