From 297b60346df8beafee954a0fd7c2d64f33f3b9bc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 11 May 2024 01:44:05 +0000
Subject: [PATCH] rtl8211F_led_control
---
kernel/drivers/platform/chrome/cros_ec_lpc_mec.c | 95 +++++++++++++++++++++++++++--------------------
1 files changed, 55 insertions(+), 40 deletions(-)
diff --git a/kernel/drivers/platform/chrome/cros_ec_lpc_mec.c b/kernel/drivers/platform/chrome/cros_ec_lpc_mec.c
index 2eda2c2..9035b17 100644
--- a/kernel/drivers/platform/chrome/cros_ec_lpc_mec.c
+++ b/kernel/drivers/platform/chrome/cros_ec_lpc_mec.c
@@ -1,65 +1,73 @@
-/*
- * cros_ec_lpc_mec - LPC variant I/O for Microchip EC
- *
- * Copyright (C) 2016 Google, Inc
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- *
- * This driver uses the Chrome OS EC byte-level message-based protocol for
- * communicating the keyboard state (which keys are pressed) from a keyboard EC
- * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing,
- * but everything else (including deghosting) is done here. The main
- * motivation for this is to keep the EC firmware as simple as possible, since
- * it cannot be easily upgraded and EC flash/IRAM space is relatively
- * expensive.
- */
+// SPDX-License-Identifier: GPL-2.0
+// LPC variant I/O for Microchip EC
+//
+// Copyright (C) 2016 Google, Inc
#include <linux/delay.h>
#include <linux/io.h>
-#include <linux/mfd/cros_ec_commands.h>
-#include <linux/mfd/cros_ec_lpc_mec.h>
#include <linux/mutex.h>
#include <linux/types.h>
+
+#include "cros_ec_lpc_mec.h"
/*
* This mutex must be held while accessing the EMI unit. We can't rely on the
* EC mutex because memmap data may be accessed without it being held.
*/
static struct mutex io_mutex;
+static u16 mec_emi_base, mec_emi_end;
-/*
- * cros_ec_lpc_mec_emi_write_address
+/**
+ * cros_ec_lpc_mec_emi_write_address() - Initialize EMI at a given address.
*
- * Initialize EMI read / write at a given address.
- *
- * @addr: Starting read / write address
+ * @addr: Starting read / write address
* @access_type: Type of access, typically 32-bit auto-increment
*/
static void cros_ec_lpc_mec_emi_write_address(u16 addr,
enum cros_ec_lpc_mec_emi_access_mode access_type)
{
- /* Address relative to start of EMI range */
- addr -= MEC_EMI_RANGE_START;
- outb((addr & 0xfc) | access_type, MEC_EMI_EC_ADDRESS_B0);
- outb((addr >> 8) & 0x7f, MEC_EMI_EC_ADDRESS_B1);
+ outb((addr & 0xfc) | access_type, MEC_EMI_EC_ADDRESS_B0(mec_emi_base));
+ outb((addr >> 8) & 0x7f, MEC_EMI_EC_ADDRESS_B1(mec_emi_base));
}
-/*
- * cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port
+/**
+ * cros_ec_lpc_mec_in_range() - Determine if addresses are in MEC EMI range.
+ *
+ * @offset: Address offset
+ * @length: Number of bytes to check
+ *
+ * Return: 1 if in range, 0 if not, and -EINVAL on failure
+ * such as the mec range not being initialized
+ */
+int cros_ec_lpc_mec_in_range(unsigned int offset, unsigned int length)
+{
+ if (length == 0)
+ return -EINVAL;
+
+ if (WARN_ON(mec_emi_base == 0 || mec_emi_end == 0))
+ return -EINVAL;
+
+ if (offset >= mec_emi_base && offset < mec_emi_end) {
+ if (WARN_ON(offset + length - 1 >= mec_emi_end))
+ return -EINVAL;
+ return 1;
+ }
+
+ if (WARN_ON(offset + length > mec_emi_base && offset < mec_emi_end))
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * cros_ec_lpc_io_bytes_mec() - Read / write bytes to MEC EMI port.
*
* @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request
* @offset: Base read / write address
* @length: Number of bytes to read / write
* @buf: Destination / source buffer
*
- * @return 8-bit checksum of all bytes read / written
+ * Return: 8-bit checksum of all bytes read / written
*/
u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type,
unsigned int offset, unsigned int length,
@@ -69,6 +77,11 @@
int io_addr;
u8 sum = 0;
enum cros_ec_lpc_mec_emi_access_mode access, new_access;
+
+ /* Return checksum of 0 if window is not initialized */
+ WARN_ON(mec_emi_base == 0 || mec_emi_end == 0);
+ if (mec_emi_base == 0 || mec_emi_end == 0)
+ return 0;
/*
* Long access cannot be used on misaligned data since reading B0 loads
@@ -85,9 +98,9 @@
cros_ec_lpc_mec_emi_write_address(offset, access);
/* Skip bytes in case of misaligned offset */
- io_addr = MEC_EMI_EC_DATA_B0 + (offset & 0x3);
+ io_addr = MEC_EMI_EC_DATA_B0(mec_emi_base) + (offset & 0x3);
while (i < length) {
- while (io_addr <= MEC_EMI_EC_DATA_B3) {
+ while (io_addr <= MEC_EMI_EC_DATA_B3(mec_emi_base)) {
if (io_type == MEC_IO_READ)
buf[i] = inb(io_addr++);
else
@@ -117,7 +130,7 @@
}
/* Access [B0, B3] on each loop pass */
- io_addr = MEC_EMI_EC_DATA_B0;
+ io_addr = MEC_EMI_EC_DATA_B0(mec_emi_base);
}
done:
@@ -127,9 +140,11 @@
}
EXPORT_SYMBOL(cros_ec_lpc_io_bytes_mec);
-void cros_ec_lpc_mec_init(void)
+void cros_ec_lpc_mec_init(unsigned int base, unsigned int end)
{
mutex_init(&io_mutex);
+ mec_emi_base = base;
+ mec_emi_end = end;
}
EXPORT_SYMBOL(cros_ec_lpc_mec_init);
--
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