From 9370bb92b2d16684ee45cf24e879c93c509162da Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 19 Dec 2024 01:47:39 +0000
Subject: [PATCH] add wifi6 8852be driver
---
kernel/drivers/input/touchscreen/eeti_ts.c | 86 ++++++++++++++++++++++++++++--------------
1 files changed, 57 insertions(+), 29 deletions(-)
diff --git a/kernel/drivers/input/touchscreen/eeti_ts.c b/kernel/drivers/input/touchscreen/eeti_ts.c
index 7fe4196..2e1404c 100644
--- a/kernel/drivers/input/touchscreen/eeti_ts.c
+++ b/kernel/drivers/input/touchscreen/eeti_ts.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Touch Screen driver for EETI's I2C connected touch screen panels
* Copyright (c) 2009,2018 Daniel Mack <daniel@zonque.org>
@@ -8,20 +9,6 @@
* Based on migor_ts.c
* Copyright (c) 2008 Magnus Damm
* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>
- *
- * This file is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This file is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
@@ -41,6 +28,7 @@
struct input_dev *input;
struct gpio_desc *attn_gpio;
struct touchscreen_properties props;
+ struct mutex mutex;
bool running;
};
@@ -75,42 +63,80 @@
input_sync(eeti->input);
}
+static int eeti_ts_read(struct eeti_ts *eeti)
+{
+ int len, error;
+ char buf[6];
+
+ len = i2c_master_recv(eeti->client, buf, sizeof(buf));
+ if (len != sizeof(buf)) {
+ error = len < 0 ? len : -EIO;
+ dev_err(&eeti->client->dev,
+ "failed to read touchscreen data: %d\n",
+ error);
+ return error;
+ }
+
+ /* Motion packet */
+ if (buf[0] & 0x80)
+ eeti_ts_report_event(eeti, buf);
+
+ return 0;
+}
+
static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
{
struct eeti_ts *eeti = dev_id;
- int len;
int error;
- char buf[6];
+
+ mutex_lock(&eeti->mutex);
do {
- len = i2c_master_recv(eeti->client, buf, sizeof(buf));
- if (len != sizeof(buf)) {
- error = len < 0 ? len : -EIO;
- dev_err(&eeti->client->dev,
- "failed to read touchscreen data: %d\n",
- error);
+ /*
+ * If we have attention GPIO, trust it. Otherwise we'll read
+ * once and exit. We assume that in this case we are using
+ * level triggered interrupt and it will get raised again
+ * if/when there is more data.
+ */
+ if (eeti->attn_gpio &&
+ !gpiod_get_value_cansleep(eeti->attn_gpio)) {
break;
}
- if (buf[0] & 0x80) {
- /* Motion packet */
- eeti_ts_report_event(eeti, buf);
- }
- } while (eeti->running &&
- eeti->attn_gpio && gpiod_get_value_cansleep(eeti->attn_gpio));
+ error = eeti_ts_read(eeti);
+ if (error)
+ break;
+ } while (eeti->running && eeti->attn_gpio);
+
+ mutex_unlock(&eeti->mutex);
return IRQ_HANDLED;
}
static void eeti_ts_start(struct eeti_ts *eeti)
{
+ mutex_lock(&eeti->mutex);
+
eeti->running = true;
- wmb();
enable_irq(eeti->client->irq);
+
+ /*
+ * Kick the controller in case we are using edge interrupt and
+ * we missed our edge while interrupt was disabled. We expect
+ * the attention GPIO to be wired in this case.
+ */
+ if (eeti->attn_gpio && gpiod_get_value_cansleep(eeti->attn_gpio))
+ eeti_ts_read(eeti);
+
+ mutex_unlock(&eeti->mutex);
}
static void eeti_ts_stop(struct eeti_ts *eeti)
{
+ /*
+ * Not locking here, just setting a flag and expect that the
+ * interrupt thread will notice the flag eventually.
+ */
eeti->running = false;
wmb();
disable_irq(eeti->client->irq);
@@ -153,6 +179,8 @@
return -ENOMEM;
}
+ mutex_init(&eeti->mutex);
+
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "Failed to allocate input device.\n");
--
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