diff options
| author | Che-Liang Chiou <clchiou@chromium.org> | 2011-12-20 16:29:00 +0800 |
|---|---|---|
| committer | Gerrit <chrome-bot@google.com> | 2011-12-20 07:43:29 -0800 |
| commit | 690c2073f08f142c00c89b71195f530314360207 (patch) | |
| tree | 982d4fef0f3a5675b17cba2c71fa463e1c47458f /drivers | |
| parent | c4d58d54eb6c147e7558fc6014d51856a03a26dd (diff) | |
tegra: i2c: Support zero register address length
BUG=none
TEST=emerge-tegra_kaen chromeos-u-boot
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Change-Id: Ibb8f42116812dba74e726129ea92a941e15c272b
Reviewed-on: https://gerrit.chromium.org/gerrit/13226
Commit-Ready: Che-Liang Chiou <clchiou@chromium.org>
Tested-by: Che-Liang Chiou <clchiou@chromium.org>
Reviewed-by: Rong Chang <rongchang@chromium.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/tegra_i2c.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c index 54d38f30ab..58e42d695b 100644 --- a/drivers/i2c/tegra_i2c.c +++ b/drivers/i2c/tegra_i2c.c @@ -572,10 +572,19 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) uint offset; int i; - debug("i2c_read: chip=0x%x, addr=0x%x, len=0x%x\n", - chip, addr, len); + debug("%s: chip=0x%x, addr=0x%x, len=0x%x\n", __func__, + chip, addr, len); + + if (!alen) { + if (i2c_read_data(chip, buffer, len)) { + debug("%s: error reading\n", __func__); + return 1; + } + return 0; + } + if (!i2c_addr_ok(addr, alen)) { - debug("i2c_read: Bad address %x.%d.\n", addr, alen); + debug("%s: Bad address %x.%d.\n", __func__, addr, alen); return 1; } for (offset = 0; offset < len; offset++) { @@ -586,13 +595,13 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) (addr + offset) >> (8 * i); } if (i2c_write_data(chip, data, alen)) { - debug("i2c_read: error sending (0x%x)\n", - addr); + debug("%s: error sending (0x%x)\n", __func__, + addr); return 1; } } if (i2c_read_data(chip, buffer + offset, 1)) { - debug("i2c_read: error reading (0x%x)\n", addr); + debug("%s: error reading (0x%x)\n", __func__, addr); return 1; } } @@ -606,10 +615,19 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) uint offset; int i; - debug("i2c_write: chip=0x%x, addr=0x%x, len=0x%x\n", - chip, addr, len); + debug("%s: chip=0x%x, addr=0x%x, len=0x%x\n", __func__, + chip, addr, len); + + if (!alen) { + if (i2c_write_data(chip, buffer, len)) { + debug("%s: error sending\n", __func__); + return 1; + } + return 0; + } + if (!i2c_addr_ok(addr, alen)) { - debug("i2c_write: Bad address %x.%d.\n", addr, alen); + debug("%s: Bad address %x.%d.\n", __func__, addr, alen); return 1; } for (offset = 0; offset < len; offset++) { @@ -618,7 +636,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) data[alen - i - 1] = (addr + offset) >> (8 * i); data[alen] = buffer[offset]; if (i2c_write_data(chip, data, alen + 1)) { - debug("i2c_write: error sending (0x%x)\n", addr); + debug("%s: error sending (0x%x)\n", __func__, addr); return 1; } } |