linux-kernel - [PATCH 2/6] Input: elantech - Add the function to get more bytes from register

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Date:   Sun,  8 Dec 2019 22:14:26 -0500
From:   Dave Wang <dave.wang@....com.tw>
To:     Linux-input@...r.kernel.org, Linux-kernel@...r.kernel.org,
        Dmitry.torokhov@...il.com
Cc:     phoenix@....com.tw, josh.chen@....com.tw, jingle.wu@....com.tw,
        kai.heng.feng@...onical.com, "Dave.Wang" <dave.wang@....com.tw>
Subject: [PATCH 2/6] Input: elantech - Add the function to get more bytes from register

From: "Dave.Wang" <dave.wang@....com.tw>

Send an Elantech style special command to read three bytes from
register.

Signed-off-by: Dave Wang <dave.wang@....com.tw>
---
 drivers/input/mouse/elantech.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 1f0d914acd78..afb87122b766 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -89,6 +89,24 @@ static int elantech_ps2_command(struct psmouse *psmouse,
 	return rc;
 }
 
+/*
+ * Send an Elantech style special command to read 3 bytes from a register
+ */
+static int elantech_read_reg_params(struct psmouse *psmouse, unsigned char reg,
+				unsigned char *param)
+{
+	int rc = 0;
+
+	if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
+	    elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) ||
+	    elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
+	    elantech_ps2_command(psmouse, NULL, reg) ||
+	    elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO))
+		rc = -1;
+
+	return rc;
+}
+
 /*
  * Send an Elantech style special command to read a value from a register
  */
-- 
2.17.1