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Input: synaptics - refactor agm packet parsing

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When a Synaptics touchpad is in "AGM" mode, and multiple fingers are
detected, the touchpad sends alternating "Advanced Gesture Mode" (AGM) and
"Simple Gesture Mode" (SGM) packets.
  The AGM packets have w=2, and contain reduced resolution finger data.
  The SGM packets have w={0,1} and contain full resolution finger data.

Refactor the parsing of agm packets to its own function, and rename the
synaptics_data.mt field to .agm to indicate that it contains the contents of
the last agm packet.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Daniel Kurtz 2011-08-23 23:00:33 -07:00 committed by Dmitry Torokhov
parent 6de58dd625
commit 7afdb842d9
2 changed files with 19 additions and 6 deletions
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19
drivers/input/mouse/synaptics.c
View File

@ -419,6 +419,17 @@ static void synaptics_pt_create(struct psmouse *psmouse)
* Functions to interpret the absolute mode packets
****************************************************************************/
static void synaptics_parse_agm(const unsigned char buf[],
struct synaptics_data *priv)
{
struct synaptics_hw_state *agm = &priv->agm;
/* 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;
}
static int synaptics_parse_hw_state(const unsigned char buf[],
struct synaptics_data *priv,
struct synaptics_hw_state *hw)
@ -453,10 +464,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
}
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) && hw->w == 2) {
/* Gesture packet: (x, y, z) at half resolution */
priv->mt.x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
priv->mt.y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
priv->mt.z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
synaptics_parse_agm(buf, priv);
return 1;
}
@ -595,7 +603,8 @@ static void synaptics_process_packet(struct psmouse *psmouse)
}
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c))
synaptics_report_semi_mt_data(dev, &hw, &priv->mt, num_fingers);
synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
num_fingers);
/* Post events
* BTN_TOUCH has to be first as mousedev relies on it when doing

6
drivers/input/mouse/synaptics.h
View File

@ -146,7 +146,11 @@ struct synaptics_data {
struct serio *pt_port; /* Pass-through serio port */
struct synaptics_hw_state mt; /* current gesture packet */
/*
* Last received Advanced Gesture Mode (AGM) packet. An AGM packet
* contains position data for a second contact, at half resolution.
*/
struct synaptics_hw_state agm;
};
void synaptics_module_init(void);