lkml.org 
[lkml]   [2011]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 5/9 v4] Input: synaptics - decode AGM packet types
    Date
    A Synaptics image sensor tracks 5 fingers, but can only report 2.

    The algorithm for choosing which 2 fingers to report and in which packet:
    Touchpad maintains 5 slots, numbered 0 to 4
    Initially all slots are empty
    As new fingers are detected, assign them to the lowest available slots
    The touchpad always reports:
    SGM: lowest numbered non-empty slot
    AGM: highest numbered non-empty slot, if there is one

    In addition, these touchpads have a special AGM packet type which reports
    the number of fingers currently being tracked, and which finger is in
    each of the two slots. Unfortunately, these "TYPE=2" packets are only used
    when more than 3 fingers are being tracked. When less than 4 fingers
    are present, the 'w' value must be used to track how many fingers are
    present, and knowing which fingers are being reported is much more
    difficult, if not impossible.

    Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
    Acked-by: Chase Douglas <chase.douglas@canonical.com>
    ---
    drivers/input/mouse/synaptics.c | 38 +++++++++++++++++++++++++++++++-------
    drivers/input/mouse/synaptics.h | 14 +++++++++++++-
    2 files changed, 44 insertions(+), 8 deletions(-)

    diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
    index a49420f..ad0a5aa 100644
    --- a/drivers/input/mouse/synaptics.c
    +++ b/drivers/input/mouse/synaptics.c
    @@ -420,15 +420,39 @@ static void synaptics_pt_create(struct psmouse *psmouse)
    * Functions to interpret the absolute mode packets
    ****************************************************************************/

    +static void synaptics_mt_state_set(struct synaptics_mt_state *state, int count,
    + int sgm, int agm)
    +{
    + state->count = count;
    + state->sgm = sgm;
    + state->agm = agm;
    +}
    +
    static void synaptics_parse_agm(const unsigned char buf[],
    - struct synaptics_data *priv)
    + struct synaptics_data *priv,
    + struct synaptics_hw_state *hw)
    {
    struct synaptics_hw_state *agm = &priv->agm;
    + int agm_packet_type;
    +
    + agm_packet_type = (buf[5] & 0x30) >> 4;
    + switch (agm_packet_type) {
    + case 1:
    + /* Gesture packet: (x, y, z) half resolution */
    + agm->w = hw->w;
    + agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
    + agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
    + agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
    + break;

    - /* Gesture packet: (x, y, z) at half resolution */
    - agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
    - agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
    - agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
    + case 2:
    + /* AGM-CONTACT packet: (count, sgm, agm) */
    + synaptics_mt_state_set(&agm->mt_state, buf[1], buf[2], buf[4]);
    + break;
    +
    + default:
    + break;
    + }
    }

    static int synaptics_parse_hw_state(const unsigned char buf[],
    @@ -467,7 +491,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
    if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)
    || SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c))
    && hw->w == 2) {
    - synaptics_parse_agm(buf, priv);
    + synaptics_parse_agm(buf, priv, hw);
    return 1;
    }

    diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
    index 0ea7616..20f57df 100644
    --- a/drivers/input/mouse/synaptics.h
    +++ b/drivers/input/mouse/synaptics.h
    @@ -115,9 +115,18 @@
    #define SYN_REDUCED_FILTER_FUZZ 8

    /*
    - * A structure to describe the state of the touchpad hardware (buttons and pad)
    + * A structure to describe which internal touchpad finger slots are being
    + * reported in raw packets.
    */
    +struct synaptics_mt_state {
    + int count; /* num fingers being tracked */
    + int sgm; /* which slot is reported by sgm pkt */
    + int agm; /* which slot is reported by agm pkt*/
    +};

    +/*
    + * A structure to describe the state of the touchpad hardware (buttons and pad)
    + */
    struct synaptics_hw_state {
    int x;
    int y;
    @@ -130,6 +139,9 @@ struct synaptics_hw_state {
    unsigned int down:1;
    unsigned char ext_buttons;
    signed char scroll;
    +
    + /* As reported in last AGM-CONTACT packets */
    + struct synaptics_mt_state mt_state;
    };

    struct synaptics_data {
    --
    1.7.3.1


    \
     
     \ /
      Last update: 2011-08-18 13:33    [W:0.025 / U:1.072 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site