From cc75aede1b1ce29a478911ad7dadee94ecd45bbf Mon Sep 17 00:00:00 2001 From: Mike Isely Date: Sun, 15 Oct 2006 21:35:14 -0300 Subject: [PATCH] V4L/DVB (4763): Pvrusb2: Implement IR reception for 24xxx devices Unlike 29xxx devices, the 24xxx model series does not have a dedicated I2C device for reception of IR codes. Instead IR is handled directly by the FX2 microcontroller and the results are communicated via commands to the FX2. Rather than implement a whole new IR reception pathway for 24xxx devices, this changeset instead emulates the presence of the 29xxx device's I2C based IR receiver by intercepting commands to that chip and issuing appropriate FX2 commands to do the needed action. This has the result of allowing all the usual IR frameworks (ir-kbd-i2c or lirc) to continue working unmodified for 24xxx devices. Signed-off-by: Mike Isely Signed-off-by: Mauro Carvalho Chehab --- .../media/video/pvrusb2/pvrusb2-i2c-core.c | 81 ++++++++++++++++++- 1 file changed, 77 insertions(+), 4 deletions(-) diff --git a/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c b/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c index 3b9012f8e38..f9bb41d8f4f 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c +++ b/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c @@ -185,6 +185,79 @@ static int pvr2_i2c_basic_op(struct pvr2_hdw *hdw, } } + +/* This is a special entry point for cases of I2C transaction attempts to + the IR receiver. The implementation here simulates the IR receiver by + issuing a command to the FX2 firmware and using that response to return + what the real I2C receiver would have returned. We use this for 24xxx + devices, where the IR receiver chip has been removed and replaced with + FX2 related logic. */ +static int i2c_24xxx_ir(struct pvr2_hdw *hdw, + u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) +{ + u8 dat[4]; + unsigned int stat; + + if (!(rlen || wlen)) { + /* This is a probe attempt. Just let it succeed. */ + return 0; + } + + /* We don't understand this kind of transaction */ + if ((wlen != 0) || (rlen == 0)) return -EIO; + + if (rlen < 3) { + /* Mike Isely Appears to be a probe + attempt from lirc. Just fill in zeroes and return. If + we try instead to do the full transaction here, then bad + things seem to happen within the lirc driver module + (version 0.8.0-7 sources from Debian, when run under + vanilla 2.6.17.6 kernel) - and I don't have the patience + to chase it down. */ + if (rlen > 0) rdata[0] = 0; + if (rlen > 1) rdata[1] = 0; + return 0; + } + + /* Issue a command to the FX2 to read the IR receiver. */ + LOCK_TAKE(hdw->ctl_lock); do { + hdw->cmd_buffer[0] = 0xec; + stat = pvr2_send_request(hdw, + hdw->cmd_buffer,1, + hdw->cmd_buffer,4); + dat[0] = hdw->cmd_buffer[0]; + dat[1] = hdw->cmd_buffer[1]; + dat[2] = hdw->cmd_buffer[2]; + dat[3] = hdw->cmd_buffer[3]; + } while (0); LOCK_GIVE(hdw->ctl_lock); + + /* Give up if that operation failed. */ + if (stat != 0) return stat; + + /* Mangle the results into something that looks like the real IR + receiver. */ + rdata[2] = 0xc1; + if (dat[0] != 1) { + /* No code received. */ + rdata[0] = 0; + rdata[1] = 0; + } else { + u16 val; + /* Mash the FX2 firmware-provided IR code into something + that the normal i2c chip-level driver expects. */ + val = dat[1]; + val <<= 8; + val |= dat[2]; + val >>= 1; + val &= ~0x0003; + val |= 0x8000; + rdata[0] = (val >> 8) & 0xffu; + rdata[1] = val & 0xffu; + } + + return 0; +} + /* This is a special entry point that is entered if an I2C operation is attempted to a wm8775 chip on model 24xxx hardware. Autodetect of this part doesn't work, but we know it is really there. So let's look for @@ -887,17 +960,17 @@ void pvr2_i2c_core_init(struct pvr2_hdw *hdw) { unsigned int idx; - // The default action for all possible I2C addresses is just to do - // the transfer normally. + /* The default action for all possible I2C addresses is just to do + the transfer normally. */ for (idx = 0; idx < PVR2_I2C_FUNC_CNT; idx++) { hdw->i2c_func[idx] = pvr2_i2c_basic_op; } - // If however we're dealing with new hardware, insert some hacks in - // the I2C transfer stack to let things work better. + /* However, deal with various special cases for 24xxx hardware. */ if (hdw->hdw_type == PVR2_HDW_TYPE_24XXX) { hdw->i2c_func[0x1b] = i2c_hack_wm8775; hdw->i2c_func[0x44] = i2c_hack_cx25840; + hdw->i2c_func[0x18] = i2c_24xxx_ir; } // Configure the adapter and set up everything else related to it. -- 2.41.1