From 02512fe33e9162713cd522937aabc81fcd97ad74 Mon Sep 17 00:00:00 2001 From: Stefan Ringel Date: Mon, 22 Feb 2010 14:35:06 -0300 Subject: [PATCH] V4L/DVB: tm6000: bugfix reading problems with demodulator zl10353 Reading from zl10353 with tm6000 has a bug. For example: regs w/o patch with patch 0x06 0x00 0x7f 0x07 0x33 0x30 0x08 0x00 0x00 0x09 0x58 0x50 0x0f 0x31 0x28 0x10 0x00 0x84 This patch provides the workaround for the bug [mchehab@redhat.com: Fix merge conflict and add a comment at the workaround] Signed-off-by: Stefan Ringel Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/tm6000/tm6000-i2c.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/staging/tm6000/tm6000-i2c.c b/drivers/staging/tm6000/tm6000-i2c.c index a5323303c34a..ec4c9381c14a 100644 --- a/drivers/staging/tm6000/tm6000-i2c.c +++ b/drivers/staging/tm6000/tm6000-i2c.c @@ -56,9 +56,23 @@ static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr, __u8 reg, char *buf, int len) { int rc; + u8 b[2]; - rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) { + /* + * Workaround an I2C bug when reading from zl10353 + */ + reg -= 1; + len += 1; + + rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len); + + *buf = b[1]; + } else { + rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len); + } return rc; } -- 2.20.1