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Date: Sun, 19 Dec 2010 00:16:48 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Henrik Rydberg <rydberg@...omail.se>
Cc: Jiri Kosina <jkosina@...e.cz>,
Chase Douglas <chase.douglas@...onical.com>,
Chris Bagwell <chris@...bagwell.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 1/4] Input: synaptics - add multitouch packet support
On Sat, Dec 18, 2010 at 03:52:58PM +0100, Henrik Rydberg wrote:
> From: Chase Douglas <chase.douglas@...onical.com>
>
> Synaptics 2.7 series of touchpads support a mode for reporting 2 sets
> of X/Y/Pressure data (multi-touch). These same devices default mode
> report single finger data and do not report finger counts.
>
> Enabling MT mode makes finger count reporting start working in same
> fashion as touchpads that claim that capability. Up to three fingers
> can be reported this way.
>
> While in MT mode and two or three fingers are touching, two sets of
> data are sent. The first is a new format buffer with lower resolution
> reporting of stationary finger and the second is standard data format
> reporting movement.
>
> Work to enable MT and decoding its packet is from patch from Takashi Iwai.
>
> Additional cleanup/testing of original patch was performed by Chase Douglas.
>
> Minor cleanup and testing performed by Chris Bagwell.
>
> Reported-by: Tobyn Bertram
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Chase Douglas <chase.douglas@...onical.com>
> Signed-off-by: Chris Bagwell <chris@...bagwell.com>
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
> drivers/input/mouse/synaptics.c | 75 ++++++++++++++++++++++++++++++++-------
> drivers/input/mouse/synaptics.h | 4 ++
> 2 files changed, 66 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 2e300a4..8a769e9 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -279,6 +279,24 @@ static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
> synaptics_mode_cmd(psmouse, priv->mode);
> }
>
> +static int synaptics_set_multitouch_mode(struct psmouse *psmouse)
> +{
> + static unsigned char param = 0xc8;
> + struct synaptics_data *priv = psmouse->private;
> +
> + if (!SYN_CAP_MULTITOUCH(priv->ext_cap_0c))
> + return 0;
> +
> + if (psmouse_sliced_command(psmouse, SYN_QUE_MODEL))
> + return -1;
> + if (ps2_command(&psmouse->ps2dev, ¶m, PSMOUSE_CMD_SETRATE))
> + return -1;
> +
> + priv->multitouch = 1;
That should be bool/true. Also, do we need to have this variable at all
since we seem to abort initialization if multitouch mode fails?
> + printk(KERN_INFO "Synaptics: Multitouch mode enabled\n");
I'd rather only reported if we failed to activate multitouch mode on
devices that ought support it.
> + return 0;
> +}
> +
> /*****************************************************************************
> * Synaptics pass-through PS/2 port support
> ****************************************************************************/
> @@ -380,23 +398,38 @@ static void synaptics_pt_create(struct psmouse *psmouse)
> * Functions to interpret the absolute mode packets
> ****************************************************************************/
>
> -static void synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data *priv, struct synaptics_hw_state *hw)
> +static int synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data *priv, struct synaptics_hw_state *hw)
> {
> memset(hw, 0, sizeof(struct synaptics_hw_state));
>
> if (SYN_MODEL_NEWABS(priv->model_id)) {
> - hw->x = (((buf[3] & 0x10) << 8) |
> - ((buf[1] & 0x0f) << 8) |
> - buf[4]);
> - hw->y = (((buf[3] & 0x20) << 7) |
> - ((buf[1] & 0xf0) << 4) |
> - buf[5]);
> -
> - hw->z = buf[2];
> hw->w = (((buf[0] & 0x30) >> 2) |
> ((buf[0] & 0x04) >> 1) |
> ((buf[3] & 0x04) >> 2));
>
> + if (priv->multitouch && hw->w == 2) {
> + /* Multitouch data is half normal resolution */
> + hw->x = (((buf[4] & 0x0f) << 8) |
> + buf[1]) << 1;
> + hw->y = (((buf[4] & 0xf0) << 4) |
> + buf[2]) << 1;
> +
> + hw->z = ((buf[3] & 0x30) |
> + (buf[5] & 0x0f)) << 1;
> +
> + /* Only look at x, y, and z for MT */
> + return 1;
> + } else {
> + hw->x = (((buf[3] & 0x10) << 8) |
> + ((buf[1] & 0x0f) << 8) |
> + buf[4]);
> + hw->y = (((buf[3] & 0x20) << 7) |
> + ((buf[1] & 0xf0) << 4) |
> + buf[5]);
> +
> + hw->z = buf[2];
> + }
> +
> hw->left = (buf[0] & 0x01) ? 1 : 0;
> hw->right = (buf[0] & 0x02) ? 1 : 0;
>
> @@ -452,6 +485,8 @@ static void synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data
> hw->left = (buf[0] & 0x01) ? 1 : 0;
> hw->right = (buf[0] & 0x02) ? 1 : 0;
> }
> +
> + return 0;
> }
>
> /*
> @@ -466,7 +501,10 @@ static void synaptics_process_packet(struct psmouse *psmouse)
> int finger_width;
> int i;
>
> - synaptics_parse_hw_state(psmouse->packet, priv, &hw);
> + if (synaptics_parse_hw_state(psmouse->packet, priv, &hw)) {
> + priv->mt = hw;
> + return;
> + }
>
> if (hw.scroll) {
> priv->scroll += hw.scroll;
> @@ -494,7 +532,8 @@ static void synaptics_process_packet(struct psmouse *psmouse)
> if (SYN_CAP_EXTENDED(priv->capabilities)) {
> switch (hw.w) {
> case 0 ... 1:
> - if (SYN_CAP_MULTIFINGER(priv->capabilities))
> + if (SYN_CAP_MULTIFINGER(priv->capabilities) ||
> + priv->multitouch)
> num_fingers = hw.w + 2;
> break;
> case 2:
> @@ -532,7 +571,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
> input_report_key(dev, BTN_LEFT, hw.left);
> input_report_key(dev, BTN_RIGHT, hw.right);
>
> - if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
> + if (SYN_CAP_MULTIFINGER(priv->capabilities) || priv->multitouch) {
> input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
> input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
> }
> @@ -638,7 +677,7 @@ static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
> __set_bit(BTN_LEFT, dev->keybit);
> __set_bit(BTN_RIGHT, dev->keybit);
>
> - if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
> + if (SYN_CAP_MULTIFINGER(priv->capabilities) || priv->multitouch) {
> __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
> __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
> }
> @@ -702,6 +741,11 @@ static int synaptics_reconnect(struct psmouse *psmouse)
> return -1;
> }
>
> + if (synaptics_set_multitouch_mode(psmouse)) {
> + printk(KERN_ERR "Unable to initialize Synaptics Multitouch.\n");
> + return -1;
> + }
> +
> return 0;
> }
>
> @@ -769,6 +813,11 @@ int synaptics_init(struct psmouse *psmouse)
> goto init_fail;
> }
>
> + if (synaptics_set_multitouch_mode(psmouse)) {
> + printk(KERN_ERR "Unable to initialize Synaptics Multitouch.\n");
> + goto init_fail;
> + }
> +
> priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
>
> printk(KERN_INFO "Synaptics Touchpad, model: %ld, fw: %ld.%ld, id: %#lx, caps: %#lx/%#lx/%#lx\n",
> diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
> index 613a365..4cb13b8 100644
> --- a/drivers/input/mouse/synaptics.h
> +++ b/drivers/input/mouse/synaptics.h
> @@ -53,6 +53,7 @@
> #define SYN_CAP_PRODUCT_ID(ec) (((ec) & 0xff0000) >> 16)
> #define SYN_CAP_CLICKPAD(ex0c) ((ex0c) & 0x100100)
> #define SYN_CAP_MAX_DIMENSIONS(ex0c) ((ex0c) & 0x020000)
> +#define SYN_CAP_MULTITOUCH(ex0c) ((ex0c) & 0x080000)
Synaptics calls this bit "Advanced Gesture", I think we should do the
same as they might produce full-MT devices in the future.
Also, how useful is this patch without the 4th one? Why aren't they
folded together?
Thanks.
--
Dmitry
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