diff options
author | Jean Delvare <khali@linux-fr.org> | 2010-02-05 18:58:36 (GMT) |
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committer | Jean Delvare <khali@linux-fr.org> | 2010-02-05 18:58:36 (GMT) |
commit | b0bcdd3cd0adb85a7686b396ba50493871b1135c (patch) | |
tree | 37a96df71be59971d409239b9d2fe2614e142374 /drivers/hwmon | |
parent | 197027e6ef830d60e10f76efc8d12bf3b6c35db5 (diff) | |
download | linux-b0bcdd3cd0adb85a7686b396ba50493871b1135c.tar.xz |
hwmon: (w83781d) Request I/O ports individually for probing
Different motherboards have different PNP declarations for
W83781D/W83782D chips. Some declare the whole range of I/O ports (8
ports), some declare only the useful ports (2 ports at offset 5) and
some declare fancy ranges, for example 4 ports at offset 4. To
properly handle all cases, request all ports individually for probing.
After we have determined that we really have a W83781D or W83782D
chip, the useful port range will be requested again, as a single
block.
I did not see a board which needs this yet, but I know of one for lm78
driver and I'd like to keep the logic of these two drivers in sync.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/hwmon')
-rw-r--r-- | drivers/hwmon/w83781d.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c index 05f9225..32d4ade 100644 --- a/drivers/hwmon/w83781d.c +++ b/drivers/hwmon/w83781d.c @@ -1793,17 +1793,17 @@ static int __init w83781d_isa_found(unsigned short address) { int val, save, found = 0; - - /* We have to request the region in two parts because some - boards declare base+4 to base+7 as a PNP device */ - if (!request_region(address, 4, "w83781d")) { - pr_debug("w83781d: Failed to request low part of region\n"); - return 0; - } - if (!request_region(address + 4, 4, "w83781d")) { - pr_debug("w83781d: Failed to request high part of region\n"); - release_region(address, 4); - return 0; + int port; + + /* Some boards declare base+0 to base+7 as a PNP device, some base+4 + * to base+7 and some base+5 to base+6. So we better request each port + * individually for the probing phase. */ + for (port = address; port < address + W83781D_EXTENT; port++) { + if (!request_region(port, 1, "w83781d")) { + pr_debug("w83781d: Failed to request port 0x%x\n", + port); + goto release; + } } #define REALLY_SLOW_IO @@ -1877,8 +1877,8 @@ w83781d_isa_found(unsigned short address) val == 0x30 ? "W83782D" : "W83781D", (int)address); release: - release_region(address + 4, 4); - release_region(address, 4); + for (port--; port >= address; port--) + release_region(port, 1); return found; } |