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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-04 04:12:13 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-04 04:12:13 +0400 |
| commit | 7f0ef0267e20d62d45d527911a993b1e998f4968 (patch) | |
| tree | de51abc7da5903f59d83e23937f22420164c9477 /drivers/w1/slaves/w1_ds2408.c | |
| parent | 862f0012549110d6f2586bf54b52ed4540cbff3a (diff) | |
| parent | 9307c29524502c21f0e8a6d96d850b2f5bc0bd9a (diff) | |
| download | linux-7f0ef0267e20d62d45d527911a993b1e998f4968.tar.xz | |
Merge branch 'akpm' (updates from Andrew Morton)
Merge first patch-bomb from Andrew Morton:
- various misc bits
- I'm been patchmonkeying ocfs2 for a while, as Joel and Mark have been
distracted. There has been quite a bit of activity.
- About half the MM queue
- Some backlight bits
- Various lib/ updates
- checkpatch updates
- zillions more little rtc patches
- ptrace
- signals
- exec
- procfs
- rapidio
- nbd
- aoe
- pps
- memstick
- tools/testing/selftests updates
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (445 commits)
tools/testing/selftests: don't assume the x bit is set on scripts
selftests: add .gitignore for kcmp
selftests: fix clean target in kcmp Makefile
selftests: add .gitignore for vm
selftests: add hugetlbfstest
self-test: fix make clean
selftests: exit 1 on failure
kernel/resource.c: remove the unneeded assignment in function __find_resource
aio: fix wrong comment in aio_complete()
drivers/w1/slaves/w1_ds2408.c: add magic sequence to disable P0 test mode
drivers/memstick/host/r592.c: convert to module_pci_driver
drivers/memstick/host/jmb38x_ms: convert to module_pci_driver
pps-gpio: add device-tree binding and support
drivers/pps/clients/pps-gpio.c: convert to module_platform_driver
drivers/pps/clients/pps-gpio.c: convert to devm_* helpers
drivers/parport/share.c: use kzalloc
Documentation/accounting/getdelays.c: avoid strncpy in accounting tool
aoe: update internal version number to v83
aoe: update copyright date
aoe: perform I/O completions in parallel
...
Diffstat (limited to 'drivers/w1/slaves/w1_ds2408.c')
| -rw-r--r-- | drivers/w1/slaves/w1_ds2408.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/w1/slaves/w1_ds2408.c b/drivers/w1/slaves/w1_ds2408.c index 91cc2cdf02c0..cb8a8e5d9573 100644 --- a/drivers/w1/slaves/w1_ds2408.c +++ b/drivers/w1/slaves/w1_ds2408.c @@ -302,7 +302,33 @@ error: return -EIO; } +/* + * This is a special sequence we must do to ensure the P0 output is not stuck + * in test mode. This is described in rev 2 of the ds2408's datasheet + * (http://datasheets.maximintegrated.com/en/ds/DS2408.pdf) under + * "APPLICATION INFORMATION/Power-up timing". + */ +static int w1_f29_disable_test_mode(struct w1_slave *sl) +{ + int res; + u8 magic[10] = {0x96, }; + u64 rn = le64_to_cpu(*((u64*)&sl->reg_num)); + + memcpy(&magic[1], &rn, 8); + magic[9] = 0x3C; + + mutex_lock(&sl->master->bus_mutex); + res = w1_reset_bus(sl->master); + if (res) + goto out; + w1_write_block(sl->master, magic, ARRAY_SIZE(magic)); + + res = w1_reset_bus(sl->master); +out: + mutex_unlock(&sl->master->bus_mutex); + return res; +} static struct bin_attribute w1_f29_sysfs_bin_files[] = { { @@ -363,6 +389,10 @@ static int w1_f29_add_slave(struct w1_slave *sl) int err = 0; int i; + err = w1_f29_disable_test_mode(sl); + if (err) + return err; + for (i = 0; i < ARRAY_SIZE(w1_f29_sysfs_bin_files) && !err; ++i) err = sysfs_create_bin_file( &sl->dev.kobj, |