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/raydium_i2c_ts.c | 210 +++++++++++++++++++++++++++++----------------------
1 files changed, 119 insertions(+), 91 deletions(-)
diff --git a/kernel/drivers/input/touchscreen/raydium_i2c_ts.c b/kernel/drivers/input/touchscreen/raydium_i2c_ts.c
index 1a8c740..bdb3e2c 100644
--- a/kernel/drivers/input/touchscreen/raydium_i2c_ts.c
+++ b/kernel/drivers/input/touchscreen/raydium_i2c_ts.c
@@ -1,17 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Raydium touchscreen I2C driver.
*
* Copyright (C) 2012-2014, Raydium Semiconductor Corporation.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2, and only version 2, as published by the
- * Free Software Foundation.
- *
- * This program 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.
*
* Raydium reserves the right to make changes without further notice
* to the materials described herein. Raydium does not assume any
@@ -60,6 +51,7 @@
/* Touch relative info */
#define RM_MAX_RETRIES 3
+#define RM_RETRY_DELAY_MS 20
#define RM_MAX_TOUCH_NUM 10
#define RM_BOOT_DELAY_MS 100
@@ -145,83 +137,134 @@
bool wake_irq_enabled;
};
-static int raydium_i2c_send(struct i2c_client *client,
- u8 addr, const void *data, size_t len)
-{
- u8 *buf;
- int tries = 0;
- int ret;
+/*
+ * Header to be sent for RM_CMD_BANK_SWITCH command. This is used by
+ * raydium_i2c_{read|send} below.
+ */
+struct __packed raydium_bank_switch_header {
+ u8 cmd;
+ __be32 be_addr;
+};
- buf = kmalloc(len + 1, GFP_KERNEL);
- if (!buf)
+static int raydium_i2c_xfer(struct i2c_client *client, u32 addr,
+ struct i2c_msg *xfer, size_t xfer_count)
+{
+ int ret;
+ /*
+ * If address is greater than 255, then RM_CMD_BANK_SWITCH needs to be
+ * sent first. Else, skip the header i.e. xfer[0].
+ */
+ int xfer_start_idx = (addr > 0xff) ? 0 : 1;
+ xfer_count -= xfer_start_idx;
+
+ ret = i2c_transfer(client->adapter, &xfer[xfer_start_idx], xfer_count);
+ if (likely(ret == xfer_count))
+ return 0;
+
+ return ret < 0 ? ret : -EIO;
+}
+
+static int raydium_i2c_send(struct i2c_client *client,
+ u32 addr, const void *data, size_t len)
+{
+ int tries = 0;
+ int error;
+ u8 *tx_buf;
+ u8 reg_addr = addr & 0xff;
+
+ tx_buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!tx_buf)
return -ENOMEM;
- buf[0] = addr;
- memcpy(buf + 1, data, len);
+ tx_buf[0] = reg_addr;
+ memcpy(tx_buf + 1, data, len);
do {
- ret = i2c_master_send(client, buf, len + 1);
- if (likely(ret == len + 1))
- break;
+ struct raydium_bank_switch_header header = {
+ .cmd = RM_CMD_BANK_SWITCH,
+ .be_addr = cpu_to_be32(addr),
+ };
- msleep(20);
+ /*
+ * Perform as a single i2c_transfer transaction to ensure that
+ * no other I2C transactions are initiated on the bus to any
+ * other device in between. Initiating transacations to other
+ * devices after RM_CMD_BANK_SWITCH is sent is known to cause
+ * issues. This is also why regmap infrastructure cannot be used
+ * for this driver. Regmap handles page(bank) switch and reads
+ * as separate i2c_transfer() operations. This can result in
+ * problems if the Raydium device is on a shared I2C bus.
+ */
+ struct i2c_msg xfer[] = {
+ {
+ .addr = client->addr,
+ .len = sizeof(header),
+ .buf = (u8 *)&header,
+ },
+ {
+ .addr = client->addr,
+ .len = len + 1,
+ .buf = tx_buf,
+ },
+ };
+
+ error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
+ if (likely(!error))
+ goto out;
+
+ msleep(RM_RETRY_DELAY_MS);
} while (++tries < RM_MAX_RETRIES);
- kfree(buf);
-
- if (unlikely(ret != len + 1)) {
- if (ret >= 0)
- ret = -EIO;
- dev_err(&client->dev, "%s failed: %d\n", __func__, ret);
- return ret;
- }
-
- return 0;
+ dev_err(&client->dev, "%s failed: %d\n", __func__, error);
+out:
+ kfree(tx_buf);
+ return error;
}
static int raydium_i2c_read(struct i2c_client *client,
- u8 addr, void *data, size_t len)
+ u32 addr, void *data, size_t len)
{
- struct i2c_msg xfer[] = {
- {
- .addr = client->addr,
- .len = 1,
- .buf = &addr,
- },
- {
- .addr = client->addr,
- .flags = I2C_M_RD,
- .len = len,
- .buf = data,
- }
- };
- int ret;
-
- ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
- if (unlikely(ret != ARRAY_SIZE(xfer)))
- return ret < 0 ? ret : -EIO;
-
- return 0;
-}
-
-static int raydium_i2c_read_message(struct i2c_client *client,
- u32 addr, void *data, size_t len)
-{
- __be32 be_addr;
- size_t xfer_len;
int error;
while (len) {
- xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
+ u8 reg_addr = addr & 0xff;
+ struct raydium_bank_switch_header header = {
+ .cmd = RM_CMD_BANK_SWITCH,
+ .be_addr = cpu_to_be32(addr),
+ };
+ size_t xfer_len = min_t(size_t, len, RM_MAX_READ_SIZE);
- be_addr = cpu_to_be32(addr);
+ /*
+ * Perform as a single i2c_transfer transaction to ensure that
+ * no other I2C transactions are initiated on the bus to any
+ * other device in between. Initiating transacations to other
+ * devices after RM_CMD_BANK_SWITCH is sent is known to cause
+ * issues. This is also why regmap infrastructure cannot be used
+ * for this driver. Regmap handles page(bank) switch and writes
+ * as separate i2c_transfer() operations. This can result in
+ * problems if the Raydium device is on a shared I2C bus.
+ */
+ struct i2c_msg xfer[] = {
+ {
+ .addr = client->addr,
+ .len = sizeof(header),
+ .buf = (u8 *)&header,
+ },
+ {
+ .addr = client->addr,
+ .len = 1,
+ .buf = ®_addr,
+ },
+ {
+ .addr = client->addr,
+ .len = xfer_len,
+ .buf = data,
+ .flags = I2C_M_RD,
+ }
+ };
- error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
- &be_addr, sizeof(be_addr));
- if (!error)
- error = raydium_i2c_read(client, addr & 0xff,
- data, xfer_len);
- if (error)
+ error = raydium_i2c_xfer(client, addr, xfer, ARRAY_SIZE(xfer));
+ if (unlikely(error))
return error;
len -= xfer_len;
@@ -232,27 +275,13 @@
return 0;
}
-static int raydium_i2c_send_message(struct i2c_client *client,
- u32 addr, const void *data, size_t len)
-{
- __be32 be_addr = cpu_to_be32(addr);
- int error;
-
- error = raydium_i2c_send(client, RM_CMD_BANK_SWITCH,
- &be_addr, sizeof(be_addr));
- if (!error)
- error = raydium_i2c_send(client, addr & 0xff, data, len);
-
- return error;
-}
-
static int raydium_i2c_sw_reset(struct i2c_client *client)
{
const u8 soft_rst_cmd = 0x01;
int error;
- error = raydium_i2c_send_message(client, RM_RESET_MSG_ADDR,
- &soft_rst_cmd, sizeof(soft_rst_cmd));
+ error = raydium_i2c_send(client, RM_RESET_MSG_ADDR, &soft_rst_cmd,
+ sizeof(soft_rst_cmd));
if (error) {
dev_err(&client->dev, "software reset failed: %d\n", error);
return error;
@@ -304,9 +333,8 @@
if (error)
continue;
- error = raydium_i2c_read_message(client,
- le32_to_cpu(query_bank_addr),
- &ts->info, sizeof(ts->info));
+ error = raydium_i2c_read(client, le32_to_cpu(query_bank_addr),
+ &ts->info, sizeof(ts->info));
if (error)
continue;
@@ -844,8 +872,8 @@
if (ts->boot_mode != RAYDIUM_TS_MAIN)
goto out;
- error = raydium_i2c_read_message(ts->client, ts->data_bank_addr,
- ts->report_data, ts->pkg_size);
+ error = raydium_i2c_read(ts->client, ts->data_bank_addr,
+ ts->report_data, ts->pkg_size);
if (error)
goto out;
--
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