From e1eeeae2bf5ce32d6b0303e6f360c339410cd527 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Wed, 25 Aug 2010 15:22:10 +0100 Subject: [PATCH] Staging: mrst-touchscreen: fix channel allocation in the touch screen driver the touch screen driver tries to find a range of free channels (which are an array of bytes), by scanning for the "end of used channel" marker. however it tries to be WAAAAY too smart and does 32 bit logic on 8 bit quantities, and in the process completely gets it wrong (repeatedly read the same register instead of incrementing in the loop, assuming that if any of the 4 bytes in the 32 byte quantity is free, all four are free, returning the channel number divided by 4 rather than the actual first free channel number) On the setting side, the same mistakes are made by and large; changed this to just use the byte SCU write functions.... with these fixes we go from a completely non detected touchscreen to something that appears to completely get detected. (after also fixing the ordering issue that Jacobs patch should solve) Signed-off-by: Arjan van de Ven Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/staging/mrst-touchscreen/intel-mid-touch.c | 29 +++++++++------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/drivers/staging/mrst-touchscreen/intel-mid-touch.c b/drivers/staging/mrst-touchscreen/intel-mid-touch.c index abba22f..031b2f8 100644 --- a/drivers/staging/mrst-touchscreen/intel-mid-touch.c +++ b/drivers/staging/mrst-touchscreen/intel-mid-touch.c @@ -157,8 +157,8 @@ static int mrstouch_pmic_id(uint *vendor, uint *rev) */ static int mrstouch_chan_parse(struct mrstouch_dev *tsdev) { - int err, i, j, found; - u32 r32; + int err, i, found; + u8 r8; found = -1; @@ -166,15 +166,13 @@ static int mrstouch_chan_parse(struct mrstouch_dev *tsdev) if (found >= 0) break; - err = intel_scu_ipc_ioread32(PMICADDR0, &r32); + err = intel_scu_ipc_ioread8(PMICADDR0 + i, &r8); if (err) return err; - for (j = 0; j < 32; j+= 8) { - if (((r32 >> j) & 0xFF) == END_OF_CHANNEL) { - found = i; - break; - } + if (r8 == END_OF_CHANNEL) { + found = i; + break; } } if (found < 0) @@ -284,20 +282,17 @@ static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm) */ static int mrstouch_ts_chan_set(uint offset) { - int count; u16 chan; - u16 reg[5]; - u8 data[5]; + + int ret, count; chan = PMICADDR0 + offset; for (count = 0; count <= 3; count++) { - reg[count] = chan++; - data[count] = MRST_TS_CHAN10 + count; + ret = intel_scu_ipc_iowrite8(chan++, MRST_TS_CHAN10 + count); + if (ret) + return ret; } - reg[count] = chan; - data[count] = END_OF_CHANNEL; - - return intel_scu_ipc_writev(reg, data, 5); + return intel_scu_ipc_iowrite8(chan++, END_OF_CHANNEL); } /* Initialize ADC */ -- 2.7.4