linux-kernel - [PATCH 2/2] input: touchscreen: elants

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Message-Id: <20220902082843.2.I19ac6cf9b8502d92f551ff4166861debb14576ec@changeid>
Date:   Fri,  2 Sep 2022 08:32:36 +0000
From:   Yunlong Jia <yunlong.jia@....corp-partner.google.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Bob Moragues <moragues@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Henry Sun <henrysun@...gle.com>,
        Yunlong Jia <yunlong.jia@....corp-partner.google.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Johnny Chuang <johnny.chuang.emc@...il.com>,
        linux-input@...r.kernel.org
Subject: [PATCH 2/2] input: touchscreen: elants_i2c: Add eth3915n touchscreen chip

The eth3915n requires more delay time than the eth3500 when reset.
Define EKTH3915_RESET_DELAY_MSEC as the reset delay time of eth3915n,
about 300ms.

Signed-off-by: Yunlong Jia <yunlong.jia@....corp-partner.google.com>

---

 drivers/input/touchscreen/elants_i2c.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index c9dd703b0c7d8..60ddb58281bdf 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -116,6 +116,7 @@
 
 #define ELAN_POWERON_DELAY_USEC	500
 #define ELAN_RESET_DELAY_MSEC	20
+#define EKTH3915_RESET_DELAY_MSEC	300
 
 /* FW boot code version */
 #define BC_VER_H_BYTE_FOR_EKTH3900x1_I2C        0x72
@@ -133,6 +134,7 @@
 enum elants_chip_id {
 	EKTH3500,
 	EKTF3624,
+	EKTH3915,
 };
 
 enum elants_state {
@@ -664,6 +666,7 @@ static int elants_i2c_initialize(struct elants_data *ts)
 
 	switch (ts->chip_id) {
 	case EKTH3500:
+	case EKTH3915:
 		if (!error)
 			error = elants_i2c_query_ts_info_ekth(ts);
 		break;
@@ -1361,7 +1364,17 @@ static int elants_i2c_power_on(struct elants_data *ts)
 	if (error)
 		return error;
 
-	msleep(ELAN_RESET_DELAY_MSEC);
+	if (ts->chip_id == EKTH3915)
+		/*
+		 * There need delay 300ms for power on sequence.
+		 * T1 + T2 + T3 >= 305 ms
+		 * T1: 0<time<500us
+		 * T2: >5ms
+		 * T3: >300ms
+		 */
+		msleep(EKTH3915_RESET_DELAY_MSEC);
+	else
+		msleep(ELAN_RESET_DELAY_MSEC);
 
 	return 0;
 }
@@ -1686,6 +1699,7 @@ static const struct i2c_device_id elants_i2c_id[] = {
 	{ DEVICE_NAME, EKTH3500 },
 	{ "ekth3500", EKTH3500 },
 	{ "ektf3624", EKTF3624 },
+	{ "ekth3915", EKTH3915 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, elants_i2c_id);
@@ -1702,6 +1716,7 @@ MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
 static const struct of_device_id elants_of_match[] = {
 	{ .compatible = "elan,ekth3500", .data = (void *)EKTH3500 },
 	{ .compatible = "elan,ektf3624", .data = (void *)EKTF3624 },
+	{ .compatible = "elan,ekth3915", .data = (void *)EKTH3915 },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, elants_of_match);
-- 
2.17.1