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author | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:17 +0100 |
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committer | Jean Delvare <khali@linux-fr.org> | 2009-12-06 17:06:17 +0100 |
commit | 02864d58ce102804b148c92e44726d9571d65d1e (patch) | |
tree | a2f94e0dfa1e07e2cbaeec55187afe46b1bef109 /drivers/i2c | |
parent | 6f7e549f873e9ff10a4a27241db568bf7988ee0c (diff) | |
download | linux-02864d58ce102804b148c92e44726d9571d65d1e.tar.gz linux-02864d58ce102804b148c92e44726d9571d65d1e.tar.bz2 linux-02864d58ce102804b148c92e44726d9571d65d1e.zip |
i2c-powermac: Refactor i2c_powermac_smbus_xfer
I wanted to add some error logging to the i2c-powermac driver, but
found that it was very difficult due to the way the
i2c_powermac_smbus_xfer function is organized. Refactor the code in
this function so that each low-level function is only called once.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Michel Daenzer <michel@daenzer.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/i2c-powermac.c | 85 |
1 files changed, 41 insertions, 44 deletions
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c index a74f3bab05b8..dba8e387f43f 100644 --- a/drivers/i2c/busses/i2c-powermac.c +++ b/drivers/i2c/busses/i2c-powermac.c @@ -49,48 +49,38 @@ static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap, int rc = 0; int read = (read_write == I2C_SMBUS_READ); int addrdir = (addr << 1) | read; + int mode, subsize, len; + u32 subaddr; + u8 *buf; u8 local[2]; - rc = pmac_i2c_open(bus, 0); - if (rc) - return rc; + if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) { + mode = pmac_i2c_mode_std; + subsize = 0; + subaddr = 0; + } else { + mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub; + subsize = 1; + subaddr = command; + } switch (size) { case I2C_SMBUS_QUICK: - rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std); - if (rc) - goto bail; - rc = pmac_i2c_xfer(bus, addrdir, 0, 0, NULL, 0); + buf = NULL; + len = 0; break; case I2C_SMBUS_BYTE: - rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std); - if (rc) - goto bail; - rc = pmac_i2c_xfer(bus, addrdir, 0, 0, &data->byte, 1); - break; case I2C_SMBUS_BYTE_DATA: - rc = pmac_i2c_setmode(bus, read ? - pmac_i2c_mode_combined : - pmac_i2c_mode_stdsub); - if (rc) - goto bail; - rc = pmac_i2c_xfer(bus, addrdir, 1, command, &data->byte, 1); + buf = &data->byte; + len = 1; break; case I2C_SMBUS_WORD_DATA: - rc = pmac_i2c_setmode(bus, read ? - pmac_i2c_mode_combined : - pmac_i2c_mode_stdsub); - if (rc) - goto bail; if (!read) { local[0] = data->word & 0xff; local[1] = (data->word >> 8) & 0xff; } - rc = pmac_i2c_xfer(bus, addrdir, 1, command, local, 2); - if (rc == 0 && read) { - data->word = ((u16)local[1]) << 8; - data->word |= local[0]; - } + buf = local; + len = 2; break; /* Note that these are broken vs. the expected smbus API where @@ -105,28 +95,35 @@ static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap, * a repeat start/addr phase (but not stop in between) */ case I2C_SMBUS_BLOCK_DATA: - rc = pmac_i2c_setmode(bus, read ? - pmac_i2c_mode_combined : - pmac_i2c_mode_stdsub); - if (rc) - goto bail; - rc = pmac_i2c_xfer(bus, addrdir, 1, command, data->block, - data->block[0] + 1); - + buf = data->block; + len = data->block[0] + 1; break; case I2C_SMBUS_I2C_BLOCK_DATA: - rc = pmac_i2c_setmode(bus, read ? - pmac_i2c_mode_combined : - pmac_i2c_mode_stdsub); - if (rc) - goto bail; - rc = pmac_i2c_xfer(bus, addrdir, 1, command, - &data->block[1], data->block[0]); + buf = &data->block[1]; + len = data->block[0]; break; default: - rc = -EINVAL; + return -EINVAL; } + + rc = pmac_i2c_open(bus, 0); + if (rc) + return rc; + + rc = pmac_i2c_setmode(bus, mode); + if (rc) + goto bail; + + rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len); + if (rc) + goto bail; + + if (size == I2C_SMBUS_WORD_DATA && read) { + data->word = ((u16)local[1]) << 8; + data->word |= local[0]; + } + bail: pmac_i2c_close(bus); return rc; |