path: root/Documentation/i2c
diff options
authorJean Delvare <jdelvare@suse.de>2014-07-10 12:56:59 +0200
committerWolfram Sang <wsa@the-dreams.de>2014-07-17 19:56:15 +0200
commit2408c17fce9236d929b15a975cbd8129de089d62 (patch)
tree1c2c69fbba6554fe59d8dbd947aa378892990f7a /Documentation/i2c
parent1dff59831b2b78122a883f44269be6597b378afa (diff)
i2c: stub: Add support for banked register ranges
Some chips implement banked register ranges. This allows implementing more registers than the limited 8-bit address space originally allows. In order to access a register on these chips, you must first select the proper bank. Add support for this mechanism to the i2c-stub driver so that such chips can be emulated. All the bank settings are passed as module parameters. Signed-off-by: Jean Delvare <jdelvare@suse.de> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'Documentation/i2c')
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub
index a0fe7a04a3bd..a16924fbd289 100644
--- a/Documentation/i2c/i2c-stub
+++ b/Documentation/i2c/i2c-stub
@@ -47,15 +47,18 @@ unsigned long functionality:
value 0x1f0000 would only enable the quick, byte and byte data
+u8 bank_reg[10]
+u8 bank_mask[10]
+u8 bank_start[10]
+u8 bank_end[10]:
+ Optional bank settings. They tell which bits in which register
+ select the active bank, as well as the range of banked registers.
If your target driver polls some byte or word waiting for it to change, the
stub could lock it up. Use i2cset to unlock it.
-If the hardware for your driver has banked registers (e.g. Winbond sensors
-chips) this module will not work well - although it could be extended to
-support that pretty easily.
If you spam it hard enough, printk can be lossy. This module really wants
something like relayfs.

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