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Message-Id: <20220403230850.2986-2-yusisamerican@gmail.com>
Date: Sun, 3 Apr 2022 16:08:49 -0700
From: Yusuf Khan <yusisamerican@...il.com>
To: linux-kernel@...r.kernel.org
Cc: jasowang@...hat.com, mikelley@...rosoft.com, mst@...hat.com,
gregkh@...uxfoundation.org, javier@...igon.com, arnd@...db.de,
will@...nel.org, axboe@...nel.dk,
Yusuf Khan <yusisamerican@...il.com>,
Christoph Grenz <christophg+lkml@...nz-bonn.de>
Subject: [PATCH v10 1/3] drivers: ddcci: add drivers for DDCCI
This patch adds the main DDCCI driver. This interfaces with I2C to allow the
kernel to communicate with DDCCI supporting monitors, it exports a chardev
and sysfs interface for userspace.
Signed-off-by: Yusuf Khan <yusisamerican@...il.com>
Signed-off-by: Christoph Grenz <christophg+lkml@...nz-bonn.de>
---
drivers/char/Kconfig | 11 +
drivers/char/Makefile | 1 +
drivers/char/ddcci.c | 1805 +++++++++++++++++++++++++++++++++++++++++
include/linux/ddcci.h | 163 ++++
4 files changed, 1980 insertions(+)
create mode 100644 drivers/char/ddcci.c
create mode 100644 include/linux/ddcci.h
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 740811893c57..2449c17e1080 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -451,4 +451,15 @@ config RANDOM_TRUST_BOOTLOADER
pool. Otherwise, say N here so it will be regarded as device input that
only mixes the entropy pool.
+config DDCCI
+ tristate "DDCCI display protocol support"
+ depends on I2C
+ help
+ Display Data Channel Command Interface is an
+ interface that allows the kernel to "talk"
+ to most displays made after 2005. Check your
+ display's specification to see if it has
+ support for this. This depends on I2C to
+ compile.
+
endmenu
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 264eb398fdd4..eaa2d58d50df 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -3,6 +3,7 @@
# Makefile for the kernel character device drivers.
#
+obj-$(CONFIG_DDCCI) += ddcci.o
obj-y += mem.o random.o
obj-$(CONFIG_TTY_PRINTK) += ttyprintk.o
obj-y += misc.o
diff --git a/drivers/char/ddcci.c b/drivers/char/ddcci.c
new file mode 100644
index 000000000000..2861c537468f
--- /dev/null
+++ b/drivers/char/ddcci.c
@@ -0,0 +1,1805 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DDC/CI sub-bus driver
+ *
+ * Copyright (c) 2015 Christoph Grenz
+ */
+
+/*
+ * This program 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.
+ */
+
+#include <linux/fcntl.h>
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/version.h>
+
+#include <linux/ddcci.h>
+
+#define DDCCI_RECV_BUFFER_SIZE 130
+#define DEVICE_NAME "ddcci"
+#define DDCCI_MAX_CAP_CHUNKS 200
+
+static unsigned int delay = 60;
+static unsigned short autoprobe_addrs[127] = {0xF0, 0xF2, 0xF4, 0xF6, 0xF8};
+static int autoprobe_addr_count = 5;
+
+static dev_t ddcci_cdev_first;
+static dev_t ddcci_cdev_next;
+static dev_t ddcci_cdev_end;
+static DEFINE_MUTEX(core_lock);
+
+struct bus_type ddcci_bus_type;
+EXPORT_SYMBOL_GPL(ddcci_bus_type);
+
+/* Assert neccessary string array sizes */
+#ifndef sizeof_field
+# define sizeof_field(t, m) FIELD_SIZEOF(t, m)
+#endif
+static_assert(sizeof_field(struct ddcci_device, prot) > 8);
+static_assert(sizeof_field(struct ddcci_device, type) > 8);
+static_assert(sizeof_field(struct ddcci_device, model) > 8);
+static_assert(sizeof_field(struct ddcci_device, vendor) > 8);
+static_assert(sizeof_field(struct ddcci_device, module) > 8);
+
+/* Internal per-i2c-client driver data */
+struct ddcci_bus_drv_data {
+ unsigned long quirks;
+ struct i2c_client *i2c_dev;
+ struct mutex mut;
+ unsigned char recv_buffer[DDCCI_RECV_BUFFER_SIZE];
+};
+
+/* Replace non-alphanumeric characters in a string (used for modalias) */
+static void ddcci_modalias_clean(char *string, size_t n, char replacement)
+{
+ int i;
+
+ for (i = 0; i < n; ++i) {
+ char c = string[i];
+
+ if (c == 0)
+ return;
+ else if (isalpha(c))
+ string[i] = replacement;
+ }
+}
+
+/* Write a message to the DDC/CI bus using i2c_smbus_write_byte() */
+static int __ddcci_write_bytewise(struct i2c_client *client, unsigned char addr,
+ bool p_flag, const unsigned char *__restrict buf,
+ unsigned char len)
+{
+ int ret = 0;
+ unsigned char outer_addr = (unsigned char) (client->addr << 1);
+ unsigned int xor = outer_addr; /* initial xor value */
+
+ /* Consistency checks, maximum allowed by DDCCI spec */
+ if (len > 32)
+ return -EINVAL;
+
+ /* Special case: reply to 0x6E is always 0x51 */
+ if (addr == DDCCI_DEFAULT_DEVICE_ADDR) {
+ addr = DDCCI_HOST_ADDR_ODD;
+ } else {
+ /* When sending the odd address is used */
+ addr = addr | 1;
+ }
+
+ /* first byte: sender address */
+ xor ^= addr;
+ ret = i2c_smbus_write_byte(client, addr);
+ if (ret < 0)
+ return ret;
+
+ /* second byte: protocol flag and message size */
+ xor ^= ((p_flag << 7) | len);
+ ret = i2c_smbus_write_byte(client, (p_flag << 7) | len);
+ if (ret < 0)
+ return ret;
+
+ /* send payload */
+ while (len--) {
+ xor ^= (*buf);
+ ret = i2c_smbus_write_byte(client, (*buf));
+ if (ret < 0)
+ return ret;
+ buf++;
+ }
+
+ /* send checksum */
+ ret = i2c_smbus_write_byte(client, xor);
+ return ret;
+}
+
+/* Write a message to the DDC/CI bus using i2c_master_send() */
+static int __ddcci_write_block(struct i2c_client *client, unsigned char addr,
+ unsigned char *sendbuf, bool p_flag,
+ const unsigned char *data, unsigned char len)
+{
+ unsigned char outer_addr = (unsigned char) (client->addr << 1);
+ unsigned int xor = outer_addr; /* initial xor value */
+ unsigned char *ptr = sendbuf;
+
+ /* Consistency checks, maximum allowed by DDCCI spec */
+ if (len > 32)
+ return -EINVAL;
+
+ /* Special case: sender to 0x6E is always 0x51 */
+ if (addr == DDCCI_DEFAULT_DEVICE_ADDR) {
+ addr = DDCCI_HOST_ADDR_ODD;
+ } else {
+ /* When sending the odd address is used */
+ addr = addr | 1;
+ }
+
+ /* first byte: sender address */
+ xor ^= addr;
+ *(ptr++) = addr;
+ /* second byte: protocol flag and message size */
+ xor ^= ((p_flag << 7) | len);
+ *(ptr++) = (p_flag << 7) | len;
+ /* payload */
+ while (len--) {
+ xor ^= (*data);
+ *(ptr++) = (*data);
+ data++;
+ }
+ /* checksum */
+ (*ptr) = xor;
+
+ /* Send it */
+ return i2c_master_send(client, sendbuf, ptr - sendbuf + 1);
+}
+
+/*
+ * Write a message to the DDC/CI bus.
+ *
+ * You must hold the bus mutex when calling this function.
+ */
+static int ddcci_write(struct i2c_client *client, unsigned char addr,
+ bool p_flag, const unsigned char *data,
+ unsigned char len)
+{
+ struct ddcci_bus_drv_data *drv_data;
+ unsigned char *sendbuf;
+ int ret;
+
+ drv_data = i2c_get_clientdata(client);
+
+
+ pr_debug("sending to %d:%02x:%02x: %*ph\n", client->adapter->nr,
+ client->addr << 1, addr, len, data);
+ if (drv_data->quirks & DDCCI_QUIRK_WRITE_BYTEWISE) {
+ ret = __ddcci_write_bytewise(client, addr, p_flag, data, len);
+ } else {
+ sendbuf = drv_data->recv_buffer;
+ ret = __ddcci_write_block(client, addr, sendbuf, p_flag, data, len);
+ }
+
+ return ret;
+}
+
+/*
+ * Read a response from the DDC/CI bus with headers directly into a buffer.
+ * Always check for DDCCI_QUIRK_SKIP_FIRST_BYTE when using this function.
+ * The returned length contains the whole unmodified response.
+ * If -EMSGSIZE is returned, the buffer contains the response up to `len`.
+ * If any other negative error code is returned, the buffer content is
+ * unspecified.
+ */
+static int __ddcci_read(struct i2c_client *client, unsigned char addr,
+ bool p_flag, unsigned long quirks, unsigned char *buf,
+ unsigned char len)
+{
+ int i, payload_len, packet_length, ret;
+ unsigned char xor = DDCCI_HOST_ADDR_EVEN;
+
+ /* Consistency checks */
+ if (len < 3)
+ return -EINVAL;
+
+ /* Read frame */
+ ret = i2c_master_recv(client, buf, len);
+ if (ret < 0)
+ goto out_err;
+ packet_length = ret;
+
+ /* Skip first byte if quirk active */
+ if ((quirks & DDCCI_QUIRK_SKIP_FIRST_BYTE) && ret > 0 && len > 0) {
+ ret--;
+ len--;
+ buf++;
+ }
+
+ /* If answer too short (= incomplete) break out */
+ if (ret < 3) {
+ ret = -EIO;
+ goto out_err;
+ }
+
+ /* validate first byte */
+ if (buf[0] != addr) {
+ ret = (buf[0] == '\0') ? -EAGAIN : -EIO;
+ goto out_err;
+ }
+
+ /* validate second byte (protocol flag) */
+ if ((buf[1] & 0x80) != (p_flag << 7)) {
+ if (!p_flag || !(quirks & DDCCI_QUIRK_NO_PFLAG)) {
+ ret = -EIO;
+ goto out_err;
+ }
+ }
+
+ /* get and check payload length */
+ payload_len = buf[1] & 0x7F;
+ if (3 + payload_len > packet_length)
+ return -EBADMSG;
+ if (3 + payload_len > len)
+ return -EMSGSIZE;
+
+ /* calculate checksum */
+ for (i = 0; i < 3 + payload_len; i++)
+ xor ^= buf[i];
+
+ /* verify checksum */
+ if (xor != 0) {
+ dev_err(&client->dev, "invalid DDC/CI response, corrupted data - xor is 0x%02x, length 0x%02x\n",
+ xor, payload_len);
+ ret = -EBADMSG;
+ goto out_err;
+ }
+
+ /* return result */
+ ret = payload_len + 3 + ((quirks & DDCCI_QUIRK_SKIP_FIRST_BYTE) ? 1:0);
+
+out_err:
+ return ret;
+}
+
+/*
+ * Read a response from the DDC/CI bus
+ *
+ * You must hold the bus mutex when calling this function.
+ */
+static int ddcci_read(struct i2c_client *client, unsigned char addr,
+ bool p_flag, unsigned char *buf, unsigned char len)
+{
+ struct ddcci_bus_drv_data *drv_data;
+ unsigned char *recvbuf;
+ int ret;
+
+ drv_data = i2c_get_clientdata(client);
+ recvbuf = drv_data->recv_buffer;
+
+ /* Read frame */
+ ret = __ddcci_read(client, addr, p_flag,
+ drv_data->quirks, recvbuf, DDCCI_RECV_BUFFER_SIZE);
+ if (ret < 0)
+ return ret;
+
+ if (drv_data->quirks & DDCCI_QUIRK_SKIP_FIRST_BYTE)
+ recvbuf++;
+
+ /* return result */
+ if (buf) {
+ if (ret > 3) {
+ ret = ret-3;
+ /* copy to caller buffer */
+ memcpy(buf, &recvbuf[2], (ret < len) ? ret : len);
+
+ if (ret > len) {
+ /* if message was truncated, return -EMSGSIZE */
+ pr_debug("received from %d:%02x:%02x: [%u/%u] %*ph ...\n",
+ client->adapter->nr, client->addr << 1,
+ addr, ret, len, len, buf);
+ ret = -EMSGSIZE;
+ } else {
+ pr_debug("received from %d:%02x:%02x: [%u/%u] %*ph\n",
+ client->adapter->nr, client->addr << 1,
+ addr, ret, len, ret, buf);
+ }
+ }
+ }
+ if (!(drv_data->quirks & DDCCI_QUIRK_WRITE_BYTEWISE)) {
+ /* second read to clear buffers, needed on some devices */
+ __ddcci_read(client, addr, true, drv_data->quirks, recvbuf, 1);
+ }
+ return ret;
+}
+
+/* Request the capability string for a device and put it into buf */
+static int ddcci_get_caps(struct i2c_client *client, unsigned char addr,
+ unsigned char *buf, unsigned int len)
+{
+ int result = 0, counter = 0, offset = 0;
+ unsigned char cmd[3] = { DDCCI_COMMAND_CAPS, 0x00, 0x00 };
+ unsigned char *chunkbuf = kzalloc(35, GFP_KERNEL);
+
+ if (!chunkbuf)
+ return -ENOMEM;
+
+ do {
+ /* Send command */
+ result = ddcci_write(client, addr, true, cmd, sizeof(cmd));
+ if (result < 0)
+ goto err_free;
+ msleep(delay);
+ /* read result chunk */
+ result = ddcci_read(client, addr, true, chunkbuf,
+ (len > 32) ? 35 : len + 3);
+ if (result < 0)
+ goto err_free;
+
+ if (result > 0) {
+ /* check chunk header */
+ if (chunkbuf[0] != DDCCI_REPLY_CAPS) {
+ result = -EIO;
+ goto err_free;
+ }
+ if (chunkbuf[1] != cmd[1] || chunkbuf[2] != cmd[2]) {
+ result = -EIO;
+ goto err_free;
+ }
+ if (result < 3) {
+ result = -EIO;
+ goto err_free;
+ }
+ memcpy(buf, chunkbuf + 3, min((unsigned int)result - 3, len));
+
+ counter++;
+ /* adjust offset, etc. */
+ offset += result-3;
+ len -= result-3;
+ buf += result-3;
+ cmd[1] = offset >> 8;
+ cmd[2] = offset & 0xFF;
+ /* Another superfluous read to make some devices happy... */
+ ddcci_read(client, addr, true, NULL, 2);
+ }
+ } while (result > 3 && counter < DDCCI_MAX_CAP_CHUNKS);
+
+ kfree(chunkbuf);
+ return offset + result-3;
+err_free:
+ kfree(chunkbuf);
+ return result;
+}
+
+/*
+ * Request the device identification and put it into buf.
+ *
+ * Also detects all communication quirks and sets the corresponding flags
+ * in the ddcci_bus_drv_data structure associated with client.
+ *
+ * The identification command will fail on most DDC devices, as it is optional
+ * to support, but even the "failed" response suffices to detect quirks.
+ */
+static int ddcci_identify_device(struct i2c_client *client, unsigned char addr,
+ unsigned char *buf, unsigned char len)
+{
+ int i, payload_len, ret = -ENODEV;
+ unsigned long quirks;
+ unsigned char cmd[1] = { DDCCI_COMMAND_ID };
+ unsigned char *buffer;
+ unsigned char xor = DDCCI_HOST_ADDR_EVEN;
+ struct ddcci_bus_drv_data *bus_drv_data;
+
+ bus_drv_data = i2c_get_clientdata(client);
+ quirks = bus_drv_data->quirks;
+ buffer = bus_drv_data->recv_buffer;
+
+ /* Send Identification command */
+ if (!(quirks & DDCCI_QUIRK_WRITE_BYTEWISE)) {
+ ret = __ddcci_write_block(client, addr, buffer, true, cmd, sizeof(cmd));
+ dev_dbg(&client->dev,
+ "[%02x:%02x] writing identification command in block mode: %d\n",
+ client->addr << 1, addr, ret);
+ if ((ret == -ENXIO)
+ && i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE)) {
+ quirks |= DDCCI_QUIRK_WRITE_BYTEWISE;
+ dev_info(&client->dev,
+ "DDC/CI bus quirk detected: writes must be done bytewise\n");
+ /* Some devices need writing twice after a failed blockwise write */
+ __ddcci_write_bytewise(client, addr, true, cmd, sizeof(cmd));
+ msleep(delay);
+ }
+ }
+ if (ret < 0 && (quirks & DDCCI_QUIRK_WRITE_BYTEWISE)) {
+ ret = __ddcci_write_bytewise(client, addr, true, cmd, sizeof(cmd));
+ dev_dbg(&client->dev,
+ "[%02x:%02x] writing identification command in bytewise mode: %d\n",
+ client->addr << 1, addr, ret);
+ }
+ if (ret < 0)
+ return -ENODEV;
+
+ /* Wait */
+ msleep(delay);
+
+ /* Receive response */
+ ret = i2c_master_recv(client, buffer, DDCCI_RECV_BUFFER_SIZE);
+ if (ret < 0) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] receiving identification response resulted in errno %d\n",
+ client->addr << 1, addr, ret);
+ return ret;
+ }
+
+ if (ret == 0) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] no identification response received\n",
+ client->addr << 1, addr);
+ return ret;
+ }
+
+ /* Skip first byte if quirk already active */
+ if (quirks & DDCCI_QUIRK_SKIP_FIRST_BYTE && ret > 1) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] doubled first byte quirk in effect\n",
+ client->addr << 1, addr);
+ ret--;
+ buffer++;
+ }
+
+ /* If answer too short (= incomplete) break out */
+ if (ret < 3) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response is too short (%d bytes)\n",
+ client->addr << 1, addr, ret);
+ return -EIO;
+ }
+
+ /* validate first byte */
+ if (buffer[0] != addr) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response: %*ph\n",
+ client->addr << 1, addr, (ret > 32 ? 32 : ret), buffer);
+
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response invalid (expected first byte %02x, got %02x)\n",
+ client->addr << 1, addr, addr, buffer[0]);
+ return -ENODEV;
+ }
+
+ /* Check if first byte is doubled (QUIRK_SKIP_FIRST_BYTE) */
+ if (!(quirks & DDCCI_QUIRK_SKIP_FIRST_BYTE)) {
+ if (buffer[0] == buffer[1]) {
+ quirks |= DDCCI_QUIRK_SKIP_FIRST_BYTE;
+ dev_info(&client->dev,
+ "DDC/CI bus quirk detected: doubled first byte on read\n");
+ ret--;
+ buffer++;
+ if (ret < 3)
+ return -EIO;
+ }
+ }
+
+ /* validate second byte (protocol flag) */
+ if ((buffer[1] & 0x80) != 0x80 && !(quirks & DDCCI_QUIRK_NO_PFLAG)) {
+ dev_info(&client->dev,
+ "DDC/CI bus quirk detected: device omits protocol flag on responses\n");
+ quirks |= DDCCI_QUIRK_NO_PFLAG;
+ }
+
+ /* get and check payload length */
+ payload_len = buffer[1] & 0x7F;
+ if (3 + payload_len > ret) {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response: %*ph ...\n",
+ client->addr << 1, addr, ret, buffer);
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response was truncated (expected %d bytes, got %d)\n",
+ client->addr << 1, addr, 3+payload_len, ret);
+ return -EBADMSG;
+ }
+
+ dev_dbg(&client->dev,
+ "[%02x:%02x] identification response: %*ph\n",
+ client->addr << 1, addr, 3+payload_len, buffer);
+
+ /* calculate checksum */
+ for (i = 0; i < 3 + payload_len; i++)
+ xor ^= buffer[i];
+
+ /* verify checksum */
+ if (xor != 0) {
+ dev_err(&client->dev,
+ "[%02x:%02x] invalid DDC/CI response, corrupted data - xor is 0x%02x, length 0x%02x\n",
+ client->addr << 1, addr, xor, payload_len);
+ return -EBADMSG;
+ }
+
+ /* save quirks */
+ bus_drv_data->quirks = quirks;
+
+ /* return result */
+ if (payload_len <= len) {
+ ret = payload_len;
+ memcpy(buf, &buffer[2], payload_len);
+ } else {
+ ret = -EMSGSIZE;
+ memcpy(buf, &buffer[2], len);
+ }
+ return ret;
+}
+
+/* Character device */
+
+/* Data structure for an open file handle */
+struct ddcci_fp_data {
+ struct ddcci_device *dev;
+ unsigned char buffer[129];
+};
+
+/* Called when the character device is opened */
+static int ddcci_cdev_open(struct inode *inode, struct file *filp)
+{
+ struct ddcci_device *dev = container_of(inode->i_cdev,
+ struct ddcci_device, cdev);
+ struct ddcci_fp_data *fp_data = NULL;
+
+ fp_data = kzalloc(sizeof(struct ddcci_fp_data), GFP_KERNEL);
+
+ if (!fp_data)
+ return -ENOMEM;
+
+ fp_data->dev = dev;
+ filp->private_data = fp_data;
+
+ return 0;
+}
+
+/* Called when reading from the character device */
+static ssize_t ddcci_cdev_read(struct file *filp, char __user *buffer,
+ size_t length, loff_t *offset)
+{
+ struct ddcci_fp_data *fp_data = filp->private_data;
+ struct ddcci_device *dev = fp_data->dev;
+ unsigned char *buf = fp_data->buffer;
+ const bool nonblocking = (filp->f_flags & O_NONBLOCK) != 0;
+ int ret = 0;
+
+ if ((filp->f_mode & FMODE_READ) == 0)
+ return -EBADF;
+
+ /* Lock mutex */
+ if (nonblocking) {
+ if (mutex_trylock(&dev->bus_drv_data->mut))
+ return -EAGAIN;
+ } else {
+ if (mutex_lock_interruptible(&dev->bus_drv_data->mut))
+ return -ERESTARTSYS;
+ }
+
+ /* Execute read */
+ ret = ddcci_read(dev->bus_drv_data->i2c_dev, dev->inner_addr, true, buf,
+ length);
+
+ if (ret > 0) {
+ /* Copy data from user space */
+ if (copy_to_user(buffer, buf, ret)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ }
+
+out:
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return ret;
+}
+
+/* Called when writing to the character device */
+static ssize_t ddcci_cdev_write(struct file *filp, const char __user *buffer,
+ size_t count, loff_t *offset)
+{
+ struct ddcci_fp_data *fp_data = filp->private_data;
+ struct ddcci_device *dev = fp_data->dev;
+ unsigned char *buf = fp_data->buffer;
+ const bool nonblocking = (filp->f_flags & O_NONBLOCK) != 0;
+ int ret = 0;
+
+ if ((filp->f_mode & FMODE_WRITE) == 0)
+ return -EBADF;
+
+ if (count > 127)
+ return -EINVAL;
+
+ /* Lock mutex */
+ if (nonblocking) {
+ if (mutex_trylock(&dev->bus_drv_data->mut))
+ return -EAGAIN;
+ } else {
+ if (mutex_lock_interruptible(&dev->bus_drv_data->mut))
+ return -ERESTARTSYS;
+ }
+
+ if (count > 0) {
+ /* Copy data from user space */
+ if (copy_from_user(buf, buffer, count)) {
+ ret = -EFAULT;
+ goto err_out;
+ }
+
+ /* Execute write */
+ ret = ddcci_write(dev->bus_drv_data->i2c_dev, dev->inner_addr,
+ true, buf, count);
+ }
+
+ if (ret >= 0) {
+ msleep(delay);
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return count;
+ }
+
+err_out:
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return ret;
+}
+
+static const struct file_operations ddcci_fops = {
+ .owner = THIS_MODULE,
+ .read = ddcci_cdev_read,
+ .write = ddcci_cdev_write,
+ .open = ddcci_cdev_open,
+ .llseek = no_llseek
+};
+
+/* Set up the character device for a DDC/CI device */
+static int ddcci_setup_char_device(struct ddcci_device *device)
+{
+ int ret = -EINVAL;
+
+ /* Check if free minor exists */
+ if (ddcci_cdev_next == ddcci_cdev_end) {
+ dev_err(&device->dev, "no free major/minor\n");
+ ret = -ENFILE;
+ goto out;
+ }
+
+ /* Initialize character device node */
+ cdev_init(&device->cdev, &ddcci_fops);
+ device->cdev.owner = THIS_MODULE;
+
+ /* Publish char device */
+ device->dev.devt = ddcci_cdev_next;
+ ret = cdev_add(&device->cdev, ddcci_cdev_next, 1);
+ if (ret) {
+ device->dev.devt = 0;
+ goto out;
+ }
+
+ ddcci_cdev_next++;
+out:
+ return ret;
+}
+
+/* sysfs attributes */
+
+static ssize_t ddcci_attr_capabilities_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+ size_t len;
+
+ if (device != NULL) {
+ len = device->capabilities_len;
+ if (len > PAGE_SIZE)
+ len = PAGE_SIZE;
+ if (len == 0) {
+ ret = len;
+ } else {
+ memcpy(buf, device->capabilities, len);
+ if (len < PAGE_SIZE) {
+ buf[len] = '\n';
+ ret = len + 1;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static ssize_t ddcci_attr_prot_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+ size_t len;
+
+ if (device != NULL) {
+ len = strnlen(device->prot, sizeof(device->prot));
+ strncpy(buf, device->prot, PAGE_SIZE);
+ if (len == 0) {
+ ret = len;
+ } else if (len < PAGE_SIZE) {
+ buf[len] = '\n';
+ ret = len + 1;
+ } else {
+ ret = PAGE_SIZE;
+ }
+ }
+ return ret;
+}
+
+static ssize_t ddcci_attr_type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+ size_t len;
+
+ if (device != NULL) {
+ len = strnlen(device->type, sizeof(device->type));
+ strncpy(buf, device->type, PAGE_SIZE);
+ if (len == 0) {
+ ret = len;
+ } else if (len < PAGE_SIZE) {
+ buf[len] = '\n';
+ ret = len + 1;
+ } else {
+ ret = PAGE_SIZE;
+ }
+ }
+ return ret;
+}
+
+static ssize_t ddcci_attr_model_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+ size_t len;
+
+ if (device != NULL) {
+ len = strnlen(device->model, sizeof(device->model));
+ strncpy(buf, device->model, PAGE_SIZE);
+ if (len == 0) {
+ ret = len;
+ } else if (len < PAGE_SIZE) {
+ buf[len] = '\n';
+ ret = len + 1;
+ } else {
+ ret = PAGE_SIZE;
+ }
+ }
+ return ret;
+}
+
+static ssize_t ddcci_attr_vendor_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+
+ if (device != NULL)
+ ret = sysfs_emit(buf, "%s\n", device->vendor);
+
+ return ret;
+}
+
+static ssize_t ddcci_attr_module_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+
+ if (device != NULL)
+ ret = sysfs_emit(buf, "%s\n", device->module);
+
+ return ret;
+}
+
+static ssize_t ddcci_attr_serial_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+
+ if (device != NULL)
+ ret = scnprintf(buf, PAGE_SIZE, "%d\n", device->device_number);
+
+ return ret;
+}
+
+static ssize_t ddcci_attr_modalias_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ ssize_t ret = -ENOENT;
+ char model[ARRAY_SIZE(device->model)];
+ char vendor[ARRAY_SIZE(device->model)];
+ char module[ARRAY_SIZE(device->model)];
+
+ if (device != NULL) {
+ memcpy(model, device->model, sizeof(model));
+ memcpy(vendor, device->vendor, sizeof(vendor));
+ memcpy(module, device->module, sizeof(module));
+ ddcci_modalias_clean(model, sizeof(model), '_');
+ ddcci_modalias_clean(vendor, sizeof(vendor), '_');
+ ddcci_modalias_clean(module, sizeof(module), '_');
+
+ ret = scnprintf(buf, PAGE_SIZE, "%s%s-%s-%s-%s-%s\n",
+ DDCCI_MODULE_PREFIX,
+ device->prot,
+ device->type,
+ model,
+ vendor,
+ module
+ );
+ }
+ return ret;
+}
+
+static DEVICE_ATTR(capabilities, 0444, ddcci_attr_capabilities_show, NULL);
+static DEVICE_ATTR(idProt, 0444, ddcci_attr_prot_show, NULL);
+static DEVICE_ATTR(idType, 0444, ddcci_attr_type_show, NULL);
+static DEVICE_ATTR(idModel, 0444, ddcci_attr_model_show, NULL);
+static DEVICE_ATTR(idVendor, 0444, ddcci_attr_vendor_show, NULL);
+static DEVICE_ATTR(idModule, 0444, ddcci_attr_module_show, NULL);
+static DEVICE_ATTR(idSerial, 0444, ddcci_attr_serial_show, NULL);
+static DEVICE_ATTR(modalias, 0444, ddcci_attr_modalias_show, NULL);
+
+static struct attribute *ddcci_char_device_attrs[] = {
+ &dev_attr_capabilities.attr,
+ &dev_attr_idProt.attr,
+ &dev_attr_idType.attr,
+ &dev_attr_idModel.attr,
+ &dev_attr_idVendor.attr,
+ &dev_attr_idModule.attr,
+ &dev_attr_idSerial.attr,
+ &dev_attr_modalias.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ddcci_char_device);
+
+/* DDC/CI bus */
+
+static int ddcci_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct ddcci_device *device = to_ddcci_device(dev);
+ char model[ARRAY_SIZE(device->model)];
+ char vendor[ARRAY_SIZE(device->vendor)];
+ char module[ARRAY_SIZE(device->module)];
+
+ memcpy(model, device->model, sizeof(model));
+ memcpy(vendor, device->vendor, sizeof(vendor));
+ memcpy(module, device->module, sizeof(module));
+ ddcci_modalias_clean(model, sizeof(model), '_');
+ ddcci_modalias_clean(vendor, sizeof(vendor), '_');
+ ddcci_modalias_clean(module, sizeof(module), '_');
+
+ if (add_uevent_var(env, "MODALIAS=%s%s-%s-%s-%s-%s",
+ DDCCI_MODULE_PREFIX,
+ device->prot,
+ device->type,
+ model,
+ vendor,
+ module
+ ))
+ return -ENOMEM;
+
+ if (device->prot[0])
+ if (add_uevent_var(env, "DDCCI_PROT=%s", device->prot))
+ return -ENOMEM;
+
+ if (device->type[0])
+ if (add_uevent_var(env, "DDCCI_TYPE=%s", device->type))
+ return -ENOMEM;
+
+ if (device->model[0])
+ if (add_uevent_var(env, "DDCCI_MODEL=%s", device->model))
+ return -ENOMEM;
+
+ if (device->vendor[0]) {
+ if (add_uevent_var(env, "DDCCI_VENDOR=%s", device->vendor))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "DDCCI_MODULE=%s", device->module))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "DDCCI_UNIQ=%d", device->device_number))
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void ddcci_device_release(struct device *dev)
+{
+ struct ddcci_device *device = to_ddcci_device(dev);
+ struct ddcci_driver *driver;
+
+ /* Notify driver */
+ if (dev->driver) {
+ driver = to_ddcci_driver(dev->driver);
+ if (driver->remove)
+ driver->remove(device);
+ }
+
+ /* Teardown chardev */
+ if (dev->devt) {
+ mutex_lock(&core_lock);
+ if (device->cdev.dev == ddcci_cdev_next-1)
+ ddcci_cdev_next--;
+ cdev_del(&device->cdev);
+ mutex_unlock(&core_lock);
+ }
+
+ /* Free capability string */
+ if (device->capabilities) {
+ device->capabilities_len = 0;
+ kfree(device->capabilities);
+ }
+ /* Free device */
+ kfree(device);
+}
+
+static char *ddcci_devnode(struct device *dev,
+ umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+ struct ddcci_device *device;
+
+ device = to_ddcci_device(dev);
+ return kasprintf(GFP_KERNEL, "bus/ddcci/%d/display",
+ device->i2c_client->adapter->nr);
+}
+
+static char *ddcci_dependent_devnode(struct device *dev,
+ umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+ struct ddcci_device *device;
+
+ device = to_ddcci_device(dev);
+ if (device->flags & DDCCI_FLAG_EXTERNAL) {
+ if (device->outer_addr == device->inner_addr)
+ return kasprintf(GFP_KERNEL, "bus/ddcci/%d/e%02x",
+ device->i2c_client->adapter->nr,
+ device->outer_addr);
+ else
+ return kasprintf(GFP_KERNEL, "bus/ddcci/%d/e%02x%02x",
+ device->i2c_client->adapter->nr,
+ device->outer_addr, device->inner_addr);
+ } else {
+ return kasprintf(GFP_KERNEL, "bus/ddcci/%d/i%02x",
+ device->i2c_client->adapter->nr,
+ device->inner_addr);
+ }
+}
+
+/* Device type for main DDC/CI devices*/
+static struct device_type ddcci_device_type = {
+ .name = "ddcci-device",
+ .uevent = ddcci_device_uevent,
+ .groups = ddcci_char_device_groups,
+ .release = ddcci_device_release,
+ .devnode = ddcci_devnode
+};
+
+/* Device type for dependent DDC/CI devices*/
+static struct device_type ddcci_dependent_type = {
+ .name = "ddcci-dependent-device",
+ .uevent = ddcci_device_uevent,
+ .groups = ddcci_char_device_groups,
+ .release = ddcci_device_release,
+ .devnode = ddcci_dependent_devnode
+};
+
+/**
+ * ddcci_verify_device - return parameter as ddcci_device, or NULL
+ * @dev: device, probably from some driver model iterator
+ */
+struct ddcci_device *ddcci_verify_device(struct device *dev)
+{
+ if (!dev)
+ return NULL;
+ return (dev->type == &ddcci_device_type
+ || dev->type == &ddcci_dependent_type)
+ ? to_ddcci_device(dev)
+ : NULL;
+}
+EXPORT_SYMBOL_GPL(ddcci_verify_device);
+
+/**
+ * ddcci_quirks - Get quirks for DDC/CI device
+ * @dev: Target DDC/CI device
+ */
+unsigned long ddcci_quirks(struct ddcci_device *dev)
+{
+ if (WARN_ON(!dev))
+ return ~0L;
+ if (WARN_ON(!dev->bus_drv_data))
+ return ~0L;
+ return dev->bus_drv_data->quirks;
+}
+EXPORT_SYMBOL_GPL(ddcci_quirks);
+
+/**
+ * ddcci_register_driver - register DDC/CI driver
+ * @owner: the owning module
+ * @driver: the driver to register
+ */
+int ddcci_register_driver(struct module *owner, struct ddcci_driver *driver)
+{
+ int ret;
+
+ pr_debug("registering driver [%s]\n", driver->driver.name);
+
+ /* add the driver to the list of ddcci drivers in the driver core */
+ driver->driver.owner = owner;
+ driver->driver.bus = &ddcci_bus_type;
+
+ /* When registration returns, the driver core
+ * will have called probe() for all matching-but-unbound devices.
+ */
+ ret = driver_register(&driver->driver);
+ if (ret)
+ return ret;
+
+ pr_debug("driver [%s] registered\n", driver->driver.name);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ddcci_register_driver);
+
+/**
+ * ddcci_del_driver - unregister DDC/CI driver
+ * @driver: the driver being unregistered
+ */
+void ddcci_del_driver(struct ddcci_driver *driver)
+{
+ driver_unregister(&driver->driver);
+ pr_debug("driver [%s] unregistered\n", driver->driver.name);
+}
+EXPORT_SYMBOL_GPL(ddcci_del_driver);
+
+/**
+ * ddcci_device_write - Write a message to a DDC/CI device
+ * @dev: Target DDC/CI device
+ * @p_flag: Protocol flag, true for standard control messages
+ * @data: Data that will be written to the device
+ * @length: How many bytes to write
+ *
+ * Writes the message to the device and sleeps for 'delay' milliseconds
+ */
+int ddcci_device_write(struct ddcci_device *dev, bool p_flag,
+ unsigned char *data, unsigned char length)
+{
+ int ret;
+
+ if (mutex_lock_interruptible(&dev->bus_drv_data->mut))
+ return -EAGAIN;
+
+ ret = ddcci_write(dev->bus_drv_data->i2c_dev, dev->inner_addr, p_flag, data, length);
+ msleep(delay);
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ddcci_device_write);
+
+/**
+ * ddcci_device_read - Read a response from a DDC/CI device
+ * @dev: Target DDC/CI device
+ * @p_flag: Protocol flag, must match the corresponding write
+ * @buffer: Where to store data read from the device
+ * @length: Buffer size
+ */
+int ddcci_device_read(struct ddcci_device *dev, bool p_flag,
+ unsigned char *buffer, unsigned char length)
+{
+ int ret;
+
+ if (mutex_lock_interruptible(&dev->bus_drv_data->mut))
+ return -EAGAIN;
+
+ ret = ddcci_read(dev->bus_drv_data->i2c_dev, dev->inner_addr, p_flag, buffer, length);
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ddcci_device_read);
+
+/**
+ * ddcci_device_writeread - Write a message to a device and read the response
+ * @dev: Target DDC/CI device
+ * @p_flag: Protocol flag, true for standard control messages
+ * @buffer: Buffer used for write and read
+ * @length: How many bytes to write
+ * @maxlength: Buffer size on read
+ *
+ * Writing, sleeping and reading are done without releasing the DDC/CI bus.
+ * This provides atomicity in respect to other DDC/CI accesses on the same bus.
+ */
+int ddcci_device_writeread(struct ddcci_device *dev, bool p_flag,
+ unsigned char *buffer, unsigned char length,
+ unsigned char maxlength)
+{
+ int ret;
+
+ if (mutex_lock_interruptible(&dev->bus_drv_data->mut))
+ return -EAGAIN;
+
+ ret = ddcci_write(dev->bus_drv_data->i2c_dev, dev->inner_addr, p_flag, buffer, length);
+ if (ret < 0)
+ goto err;
+ msleep(delay);
+ ret = ddcci_read(dev->bus_drv_data->i2c_dev, dev->inner_addr, p_flag, buffer, maxlength);
+err:
+ mutex_unlock(&dev->bus_drv_data->mut);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ddcci_device_writeread);
+
+#define IS_ANY_ID(x) (((x)[0] == '\xFF') && ((x)[7] == '\xFF'))
+
+/* Check if any device id in the array matches the device and return the matching id */
+static const struct ddcci_device_id *ddcci_match_id(const struct ddcci_device_id *id,
+ const struct ddcci_device *device)
+{
+ while (id->prot[0] || id->type[0] || id->model[0] || id->vendor[0] || id->module[0]) {
+ if ((IS_ANY_ID(id->prot) || (strcmp(device->prot, id->prot) == 0))
+ && (IS_ANY_ID(id->type) || (strcmp(device->type, id->type) == 0))
+ && (IS_ANY_ID(id->model) || (strcmp(device->model, id->model) == 0))
+ && (IS_ANY_ID(id->vendor) || (strcmp(device->vendor, id->vendor) == 0))
+ && (IS_ANY_ID(id->module) || (strcmp(device->module, id->module) == 0))) {
+ return id;
+ }
+ id++;
+ }
+ return NULL;
+}
+
+static int ddcci_device_match(struct device *dev, struct device_driver *drv)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ struct ddcci_driver *driver;
+
+ if (!device)
+ return 0;
+
+ driver = to_ddcci_driver(drv);
+ /* match on an id table if there is one */
+ if (driver->id_table)
+ return ddcci_match_id(driver->id_table, device) != NULL;
+
+ return 0;
+}
+
+static int ddcci_device_probe(struct device *dev)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ struct ddcci_driver *driver;
+ const struct ddcci_device_id *id;
+ int ret = 0;
+
+ if (!device)
+ return -EINVAL;
+ driver = to_ddcci_driver(dev->driver);
+
+ id = ddcci_match_id(driver->id_table, device);
+ if (!id)
+ return -ENODEV;
+
+ if (driver->probe)
+ ret = driver->probe(device, id);
+
+ return ret;
+}
+
+static void ddcci_device_remove(struct device *dev)
+{
+ struct ddcci_device *device = ddcci_verify_device(dev);
+ struct ddcci_driver *driver;
+ int ret = 0;
+
+ if (!device)
+ return;
+ driver = to_ddcci_driver(dev->driver);
+
+ if (driver->remove)
+ ret = driver->remove(device);
+}
+
+/**
+ * DDCCI bus type structure
+ */
+struct bus_type ddcci_bus_type = {
+ .name = "ddcci",
+ .match = ddcci_device_match,
+ .probe = ddcci_device_probe,
+ .remove = ddcci_device_remove
+};
+
+/* Main I2C driver */
+
+/* Get a pointer to the closing parenthesis */
+static char *ddcci_capstr_tok(const char *s, int depth)
+{
+ const char *ptr = s;
+ char *end;
+
+ if (s == NULL || s[0] == '\0')
+ return NULL;
+
+ while ((end = strpbrk(ptr, "()"))) {
+ if (!end || depth == INT_MAX)
+ return NULL;
+ if (*end == '(')
+ depth++;
+ else if (depth > 0)
+ depth--;
+ else
+ break;
+ ptr = end + 1;
+ }
+ return end;
+}
+
+/**
+ * ddcci_find_capstr_item - Search capability string for a tag
+ * @capabilities: Capability string to search
+ * @tag: Tag to find
+ * @length: Buffer for the length of the found tag value (optional)
+ *
+ * Return a pointer to the start of the tag value (directly after the '(') on
+ * success and write the length of the value (excluding the ')') into `length`.
+ *
+ * If the tag is not found or another error occurs, an ERR_PTR is returned
+ * and `length` stays untouched.
+ */
+const char *ddcci_find_capstr_item(const char *capabilities,
+ const char *__restrict tag,
+ size_t *length)
+{
+ const char *src = capabilities, *ptr;
+ ptrdiff_t len;
+ int taglen = strnlen(tag, 1024);
+
+ /* Check length of requested tag */
+ if (taglen <= 0 || taglen > 1023)
+ return ERR_PTR(-EINVAL);
+
+ /* Find tag */
+ while (src && (strncmp(src + 1, tag, taglen) != 0 || src[1 + taglen] != '('))
+ src = ddcci_capstr_tok(src + 1, -1);
+ if (!src || src[0] == '\0')
+ return ERR_PTR(-ENOENT);
+
+ /* Locate end of value */
+ src += taglen + 2;
+ ptr = ddcci_capstr_tok(src, 0);
+ if (!ptr)
+ return ERR_PTR(-EOVERFLOW);
+
+ /* Check length of tag data */
+ len = ptr-src;
+ if (len < 0 || len > 65535)
+ return ERR_PTR(-EMSGSIZE);
+
+ /* Return pointer and length */
+ if (length != NULL)
+ *length = (size_t)len;
+ return src;
+}
+EXPORT_SYMBOL_GPL(ddcci_find_capstr_item);
+
+/* Search the capability string for a tag and copy the value to dest */
+static int ddcci_cpy_capstr_item(char *dest, const char *src,
+ const char *__restrict tag, size_t maxlen)
+{
+ const char *ptr;
+ size_t len;
+
+ /* Find tag */
+ ptr = ddcci_find_capstr_item(src, tag, &len);
+ if (IS_ERR(ptr))
+ return PTR_ERR(ptr);
+
+ /* Copy value */
+ memcpy(dest, ptr, min(len, maxlen));
+ return 0;
+}
+
+/* Fill fields in device by parsing the capability string */
+static int ddcci_parse_capstring(struct ddcci_device *device)
+{
+ const char *capstr = device->capabilities;
+ int ret = 0;
+
+ if (!capstr)
+ return -EINVAL;
+
+ /* capability string start with a paren */
+ if (capstr[0] != '(')
+ return -EINVAL;
+
+ /* get prot(...) */
+ ret = ddcci_cpy_capstr_item(device->prot, capstr, "prot", sizeof(device->prot)-1);
+ if (ret) {
+ if (ret == -ENOENT) {
+ dev_warn(&device->dev, "malformed capability string: no protocol tag");
+ memset(device->prot, 0, sizeof(device->prot)-1);
+ } else {
+ return ret;
+ }
+ }
+
+ /* get type(...) */
+ ret = ddcci_cpy_capstr_item(device->type, capstr, "type", sizeof(device->type)-1);
+ if (ret) {
+ if (ret == -ENOENT) {
+ dev_warn(&device->dev, "malformed capability string: no type tag");
+ memset(device->type, 0, sizeof(device->type)-1);
+ } else {
+ return ret;
+ }
+ }
+
+ /* and then model(...) */
+ ret = ddcci_cpy_capstr_item(device->model, capstr, "model", sizeof(device->model)-1);
+ if (ret) {
+ if (ret == -ENOENT) {
+ dev_warn(&device->dev, "malformed capability string: no model tag");
+ memset(device->model, 0, sizeof(device->model)-1);
+ } else {
+ return ret;
+ }
+ }
+
+ /* if there is no protocol tag */
+ if (!device->prot[0]) {
+ /* and no type tag: give up. */
+ if (!device->type[0])
+ return -ENOENT;
+
+ /* Assume protocol "monitor" if type is "LCD" or "CRT" */
+ if (strncasecmp(device->type, "LCD", sizeof(device->type)-1) == 0
+ || strncasecmp(device->type, "CRT", sizeof(device->type)-1) == 0) {
+ memcpy(device->prot, "monitor", 7);
+ }
+ }
+
+ /* skip the rest for now */
+
+ return 0;
+}
+
+/* Probe for a device on an inner address and create a ddcci_device for it */
+static int ddcci_detect_device(struct i2c_client *client, unsigned char addr,
+ int dependent)
+{
+ int ret;
+ unsigned char outer_addr = client->addr << 1;
+ unsigned char *buffer = NULL;
+ struct ddcci_bus_drv_data *drv_data = i2c_get_clientdata(client);
+ struct ddcci_device *device = NULL;
+
+ mutex_lock(&drv_data->mut);
+
+ /* Allocate buffer big enough for any capability string */
+ buffer = kmalloc(16384, GFP_KERNEL);
+ if (!buffer) {
+ ret = -ENOMEM;
+ goto err_end;
+ }
+
+ /* Allocate device struct */
+ device = kzalloc(sizeof(struct ddcci_device), GFP_KERNEL);
+ if (!device) {
+ ret = -ENOMEM;
+ goto err_end;
+ }
+
+ /* Initialize device */
+ device_initialize(&device->dev);
+ device->dev.parent = &client->dev;
+ device->dev.bus = &ddcci_bus_type;
+ device->outer_addr = outer_addr;
+ device->inner_addr = addr;
+ device->bus_drv_data = drv_data;
+ device->i2c_client = client;
+
+ if (!dependent) {
+ device->dev.type = &ddcci_device_type;
+ ret = dev_set_name(&device->dev, "ddcci%d", client->adapter->nr);
+ } else if (outer_addr == dependent) {
+ /* Internal dependent device */
+ device->dev.type = &ddcci_dependent_type;
+ device->flags = DDCCI_FLAG_DEPENDENT;
+ ret = dev_set_name(&device->dev, "ddcci%di%02x", client->adapter->nr, addr);
+ } else if (outer_addr == addr) {
+ /* External dependent device */
+ device->dev.type = &ddcci_dependent_type;
+ device->flags = DDCCI_FLAG_DEPENDENT | DDCCI_FLAG_EXTERNAL;
+ ret = dev_set_name(&device->dev, "ddcci%de%02x", client->adapter->nr, addr);
+ } else {
+ /* Dependent device of external dependent device Just in case something like this exists */
+ device->dev.type = &ddcci_dependent_type;
+ device->flags = DDCCI_FLAG_DEPENDENT | DDCCI_FLAG_EXTERNAL;
+ ret = dev_set_name(&device->dev, "ddcci%de%02x%02x", client->adapter->nr, outer_addr, addr);
+ }
+
+ if (ret)
+ goto err_free;
+
+ /* Read identification and check for quirks */
+ ret = ddcci_identify_device(client, addr, buffer, 29);
+ if (ret < 0) {
+ if (!dependent && (ret == -EBADMSG || ret == -EMSGSIZE))
+ dev_warn(&device->dev, "DDC/CI main device sent broken response on identification. Trying to detect solely based on capability information.\n");
+ else
+ goto err_free;
+ }
+
+ if (ret == 29 && buffer[0] == DDCCI_REPLY_ID) {
+ memcpy(device->vendor, &buffer[7], 8);
+ memcpy(device->module, &buffer[17], 8);
+ device->device_number = be32_to_cpu(*(__force __be32 *)&buffer[18]);
+ }
+
+ /* Read capabilities */
+ ret = ddcci_get_caps(client, addr, buffer, 16384);
+ if (ret > 0) {
+ /*
+ * Fixup unparenthesized capability strings, but only if the first
+ * character is an ascii lower case letter.
+ * This should still allow an early exit for completely garbled
+ * data but helps detecting devices where only the parentheses are
+ * missing, as the second char must be the first character of a
+ * keyword.
+ */
+ if (ret > 2 && buffer[0] >= 'a' && buffer[0] <= 'z') {
+ dev_err(&device->dev, "DDC/CI device quirk detected: unparenthesized capability string\n");
+ device->capabilities = kzalloc(ret + 3, GFP_KERNEL);
+ if (!device->capabilities) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ device->capabilities_len = ret + 2;
+ memcpy(&(device->capabilities[1]), buffer, ret);
+ device->capabilities[0] = '(';
+ device->capabilities[ret + 1] = ')';
+ } else {
+ /* Standard case: simply copy the received string */
+ device->capabilities = kzalloc(ret + 1, GFP_KERNEL);
+ if (!device->capabilities) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ device->capabilities_len = ret;
+ memcpy(device->capabilities, buffer, ret);
+ }
+
+ ret = ddcci_parse_capstring(device);
+ if (ret) {
+ dev_err(&device->dev, "malformed capability string: \"%s\" errno %d\n", device->capabilities, ret);
+ ret = -EINVAL;
+ goto err_free;
+ }
+ }
+
+ /* Found a device if either identification or capabilities succeeded */
+ if (!device->capabilities && device->vendor[0] == '\0') {
+ dev_dbg(&client->dev,
+ "[%02x:%02x] got neither valid identification nor capability data\n",
+ client->addr << 1, addr);
+ ret = -ENODEV;
+ goto err_free;
+ }
+
+ /* Setup chardev */
+ mutex_lock(&core_lock);
+ ret = ddcci_setup_char_device(device);
+ mutex_unlock(&core_lock);
+ if (ret)
+ goto err_free;
+
+ /* Release mutex and add device to the tree */
+ mutex_unlock(&drv_data->mut);
+ pr_debug("found device at %d:%02x:%02x\n", client->adapter->nr, outer_addr, addr);
+ ret = device_add(&device->dev);
+ if (ret)
+ goto err_free;
+
+ goto end;
+err_free:
+ put_device(&device->dev);
+err_end:
+ mutex_unlock(&drv_data->mut);
+end:
+ kfree(buffer);
+ return ret;
+}
+
+/* I2C detect function: check if a main or external dependent device exists */
+static int ddcci_detect(struct i2c_client *client, struct i2c_board_info *info)
+{
+ int ret;
+ unsigned char outer_addr;
+ unsigned char inner_addr;
+ unsigned char buf[32];
+ unsigned char cmd_id[1] = { DDCCI_COMMAND_ID };
+ unsigned char cmd_caps[3] = { DDCCI_COMMAND_CAPS, 0x00, 0x00};
+ unsigned char *cmd;
+ unsigned int cmd_len;
+
+ /* Check for i2c_master_* functionality */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ pr_debug("i2c adapter %d unsuitable: no i2c_master functionality\n", client->adapter->nr);
+ return -ENODEV;
+ }
+
+ /* send Capabilities Request (for main) or Identification Request command (for dependent devices) */
+ outer_addr = client->addr << 1;
+ inner_addr = (outer_addr == DDCCI_DEFAULT_DEVICE_ADDR) ? DDCCI_HOST_ADDR_ODD : outer_addr | 1;
+ cmd = (outer_addr == DDCCI_DEFAULT_DEVICE_ADDR) ? cmd_caps : cmd_id;
+ cmd_len = (outer_addr == DDCCI_DEFAULT_DEVICE_ADDR) ? sizeof(cmd_caps) : sizeof(cmd_id);
+ pr_debug("detecting %d:%02x\n", client->adapter->nr, outer_addr);
+
+ ret = __ddcci_write_block(client, inner_addr, buf, true, cmd, cmd_len);
+
+ if (ret == -ENXIO || ret == -EIO) {
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
+ pr_debug("i2c write failed with ENXIO or EIO but bytewise writing is not supported\n");
+ return -ENODEV;
+ }
+ pr_debug("i2c write failed with ENXIO or EIO, trying bytewise writing\n");
+ ret = __ddcci_write_bytewise(client, inner_addr, true, cmd, cmd_len);
+ if (ret == 0) {
+ msleep(delay);
+ ret = __ddcci_write_bytewise(client, inner_addr, true, cmd, cmd_len);
+ }
+ }
+
+ if (ret < 0)
+ return -ENODEV;
+
+ /* wait for device */
+ msleep(delay);
+ /* receive answer */
+ ret = i2c_master_recv(client, buf, 32);
+ if (ret < 3) {
+ pr_debug("detection failed: no answer\n");
+ return -ENODEV;
+ }
+
+ /* check response starts with outer addr */
+ if (buf[0] != outer_addr) {
+ pr_debug("detection failed: invalid %s response (%02x != %02x)\n", (cmd == cmd_id) ? "identification" : "capabilities", buf[0], outer_addr);
+ pr_debug("received message was %*ph \n", ret, buf);
+ return -ENODEV;
+ }
+
+ pr_debug("detected %d:%02x\n", client->adapter->nr, outer_addr);
+
+ /* set device type */
+ strlcpy(info->type, (outer_addr == DDCCI_DEFAULT_DEVICE_ADDR) ? "ddcci" : "ddcci-dependent", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+/* I2C probe function */
+static int ddcci_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ int i, ret = -ENODEV, tmp;
+ unsigned char main_addr, addr;
+ struct ddcci_bus_drv_data *drv_data;
+
+ /* Initialize driver data structure */
+ drv_data = devm_kzalloc(&client->dev, sizeof(struct ddcci_bus_drv_data), GFP_KERNEL);
+ if (!drv_data)
+ return -ENOMEM;
+ drv_data->i2c_dev = client;
+ mutex_init(&drv_data->mut);
+
+ /* Set i2c client data */
+ i2c_set_clientdata(client, drv_data);
+
+ if (id->driver_data == 0) {
+ /* Core device, probe at 0x6E */
+ main_addr = DDCCI_DEFAULT_DEVICE_ADDR;
+ dev_dbg(&client->dev, "probing core device [%02x]\n",
+ client->addr << 1);
+ ret = ddcci_detect_device(client, main_addr, 0);
+ if (ret) {
+ dev_info(&client->dev, "core device [%02x] probe failed: %d\n",
+ client->addr << 1, ret);
+ if (ret == -EIO)
+ ret = -ENODEV;
+ goto err_free;
+ }
+
+ /* Detect internal dependent devices */
+ dev_dbg(&client->dev, "probing internal dependent devices\n");
+ for (i = 0; i < autoprobe_addr_count; ++i) {
+ addr = (unsigned short)autoprobe_addrs[i];
+ if ((addr & 1) == 0 && addr != main_addr) {
+ tmp = ddcci_detect_device(client, addr, main_addr);
+ if (tmp < 0 && tmp != -ENODEV) {
+ dev_info(&client->dev, "internal dependent device [%02x:%02x] probe failed: %d\n",
+ client->addr << 1, addr, ret);
+ }
+ }
+ }
+ } else if (id->driver_data == 1) {
+ /* External dependent device */
+ main_addr = client->addr << 1;
+ dev_dbg(&client->dev, "probing external dependent device [%02x]\n", main_addr);
+ ret = ddcci_detect_device(client, main_addr, -1);
+ if (ret) {
+ dev_info(&client->dev, "external dependent device [%02x] probe failed: %d\n",
+ main_addr, ret);
+ if (ret == -EIO)
+ ret = -ENODEV;
+ goto err_free;
+ }
+ } else {
+ dev_warn(&client->dev,
+ "probe() called with invalid i2c device id\n");
+ ret = -EINVAL;
+ }
+
+ goto end;
+err_free:
+ devm_kfree(&client->dev, drv_data);
+end:
+ return ret;
+}
+
+/*
+ * Callback for bus_find_device() used in ddcci_remove()
+ *
+ * Find next device on i2c_client not flagged with
+ * DDCCI_FLAG_REMOVED and flag it.
+ */
+static int ddcci_remove_helper(struct device *dev, const void *p)
+{
+ struct ddcci_device *device;
+
+ device = ddcci_verify_device(dev);
+ if (!device || device->flags & DDCCI_FLAG_REMOVED)
+ return 0;
+
+ if (!p || (dev->parent == p)) {
+ device->flags |= DDCCI_FLAG_REMOVED;
+ /* Memory Barrier */
+ wmb();
+ return 1;
+ }
+
+ return 0;
+}
+
+/* I2C driver remove callback: unregister all subdevices */
+static int ddcci_remove(struct i2c_client *client)
+{
+ struct ddcci_bus_drv_data *drv_data = i2c_get_clientdata(client);
+ struct device *dev;
+
+ mutex_lock(&drv_data->mut);
+ while (1) {
+ dev = bus_find_device(&ddcci_bus_type, NULL, client,
+ ddcci_remove_helper);
+ if (!dev)
+ break;
+ device_unregister(dev);
+ put_device(dev);
+ }
+ mutex_unlock(&drv_data->mut);
+ return 0;
+}
+
+/*
+ * I2C driver device identification table.
+ */
+static const struct i2c_device_id ddcci_idtable[] = {
+ { "ddcci", 0 },
+ { "ddcci-dependent", 1 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ddcci_idtable);
+
+/*
+ * I2C driver description structure
+ */
+static struct i2c_driver ddcci_driver = {
+ .driver = {
+ .name = "ddcci",
+ .owner = THIS_MODULE,
+ },
+
+ .id_table = ddcci_idtable,
+ .probe = ddcci_probe,
+ .remove = ddcci_remove,
+ .class = I2C_CLASS_DDC,
+ .detect = ddcci_detect,
+ .address_list = I2C_ADDRS(
+ DDCCI_DEFAULT_DEVICE_ADDR>>1
+ ),
+};
+
+/*
+ * Module initialization function. Called when the module is inserted or
+ * (if builtin) at boot time.
+ */
+static int __init ddcci_module_init(void)
+{
+ int ret;
+
+ pr_debug("initializing ddcci driver\n");
+ /* Allocate a device number region for the character devices */
+ ret = alloc_chrdev_region(&ddcci_cdev_first, 0, 128, DEVICE_NAME);
+ if (ret < 0) {
+ pr_err("failed to register device region: error %d\n", ret);
+ goto err_chrdevreg;
+ }
+ ddcci_cdev_next = ddcci_cdev_first;
+ ddcci_cdev_end = MKDEV(MAJOR(ddcci_cdev_first), MINOR(ddcci_cdev_first) + 128);
+
+ /* Register bus */
+ ret = bus_register(&ddcci_bus_type);
+ if (ret) {
+ pr_err("failed to register bus 'ddcci'\n");
+ goto err_busreg;
+ }
+
+ /* Register I2C driver */
+ ret = i2c_add_driver(&ddcci_driver);
+ if (ret) {
+ pr_err("failed to register i2c driver\n");
+ goto err_drvreg;
+ }
+
+ pr_debug("ddcci driver initialized\n");
+
+ return 0;
+
+err_drvreg:
+ bus_unregister(&ddcci_bus_type);
+err_busreg:
+ unregister_chrdev_region(ddcci_cdev_first, 128);
+err_chrdevreg:
+ return ret;
+}
+
+/*
+ * Module clean-up function. Called when the module is removed.
+ */
+static void __exit ddcci_module_exit(void)
+{
+ struct device *dev;
+
+ while (1) {
+ dev = bus_find_device(&ddcci_bus_type, NULL, NULL, ddcci_remove_helper);
+ if (!dev)
+ break;
+ device_unregister(dev);
+ put_device(dev);
+ }
+
+ i2c_del_driver(&ddcci_driver);
+ bus_unregister(&ddcci_bus_type);
+ unregister_chrdev_region(ddcci_cdev_first, 128);
+}
+
+/* Let the kernel know the calls for module init and exit */
+module_init(ddcci_module_init);
+module_exit(ddcci_module_exit);
+
+/* Module description */
+MODULE_AUTHOR("Christoph Grenz <christophg+lkml@...nz-bonn.de>");
+MODULE_DESCRIPTION("DDC/CI bus driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/ddcci.h b/include/linux/ddcci.h
new file mode 100644
index 000000000000..690a9ff85d43
--- /dev/null
+++ b/include/linux/ddcci.h
@@ -0,0 +1,163 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * DDC/CI bus driver
+ *
+ * Copyright (c) 2015 Christoph Grenz
+ */
+
+/*
+ * This program 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.
+ */
+
+#ifndef _DDCCI_H
+#define _DDCCI_H
+
+#include <linux/mod_devicetable.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+
+#define DDCCI_MODULE_PREFIX "ddcci:"
+
+/* Special addresses */
+
+/* default device address (even) */
+#define DDCCI_DEFAULT_DEVICE_ADDR 0x6E
+/* receiving host address for communication with default device address */
+#define DDCCI_HOST_ADDR_EVEN 0x50
+/* sending host address for communication with default device address */
+#define DDCCI_HOST_ADDR_ODD 0x51
+
+/* Command codes */
+
+/* Identification Request */
+#define DDCCI_COMMAND_ID 0xf1
+/* Identification Reply */
+#define DDCCI_REPLY_ID 0xe1
+/* Capabilities Request */
+#define DDCCI_COMMAND_CAPS 0xf3
+/* Capabilities Reply */
+#define DDCCI_REPLY_CAPS 0xe3
+
+/* Quirks */
+
+/* Device always responds with unset protocol flag */
+#define DDCCI_QUIRK_NO_PFLAG BIT(1)
+/* Device needs writing one byte at a time */
+#define DDCCI_QUIRK_WRITE_BYTEWISE BIT(2)
+/* Device repeats first byte on read */
+#define DDCCI_QUIRK_SKIP_FIRST_BYTE BIT(3)
+
+/* Flags */
+
+#define DDCCI_FLAG_REMOVED BIT(1)
+#define DDCCI_FLAG_DEPENDENT BIT(2)
+#define DDCCI_FLAG_EXTERNAL BIT(3)
+
+extern struct bus_type ddcci_bus_type;
+
+struct ddcci_bus_drv_data;
+
+/* struct ddcci_device_id - identifies DDC/CI devices for probing */
+struct ddcci_device_id {
+ char prot[9];
+ char type[9];
+ char model[9];
+ char vendor[9];
+ char module[9];
+ kernel_ulong_t driver_data; /* Data private to the driver */
+};
+#define DDCCI_ANY_ID "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
+
+/**
+ * struct ddcci_device - represent an DDC/CI device
+ * @outer_addr: Outer device address (I2C address << 1).
+ * @inner_addr: Inner device address.
+ * @flags: Device flags.
+ * @capabilities: Device capability string.
+ * @capabilities_len: Length of capability string.
+ * @i2c_client: Parent I2C device.
+ * @bus_drv_data: Driver internal data structure.
+ * @dev: Driver model device node for the slave.
+ * @cdev: Character device structure
+ * @prot: Device class ("protocol", from capability string)
+ * @type: Device subclass ("type", from capability string)
+ * @model: Device model (from capability string)
+ * @vendor: Device vendor (from identification command response)
+ * @module: Device module (from identification command response)
+ * @device_number: Device serial (from identification command response)
+ */
+struct ddcci_device {
+ unsigned short outer_addr;
+ unsigned short inner_addr;
+ int flags;
+ char *capabilities;
+ size_t capabilities_len;
+ struct i2c_client *i2c_client;
+ struct ddcci_bus_drv_data *bus_drv_data;
+ struct device dev;
+ struct cdev cdev;
+ char prot[9];
+ char type[9];
+ char model[9];
+ char vendor[9];
+ char module[9];
+ int device_number;
+};
+#define to_ddcci_device(d) container_of(d, struct ddcci_device, dev)
+
+/**
+ * struct ddcci_driver - represent an DDC/CI device driver
+ * @probe: Callback for device binding
+ * @remove: Callback for device unbinding
+ * @driver: Device driver model driver
+ * @id_table: List of DDC/CI devices supported by this driver
+ *
+ * The driver.owner field should be set to the module owner of this driver.
+ * The driver.name field should be set to the name of this driver.
+ */
+struct ddcci_driver {
+ int (*probe)(struct ddcci_device *, const struct ddcci_device_id *);
+ int (*remove)(struct ddcci_device *);
+ struct device_driver driver;
+ struct ddcci_device_id *id_table;
+};
+#define to_ddcci_driver(d) container_of(d, struct ddcci_driver, driver)
+
+int ddcci_register_driver(struct module *owner, struct ddcci_driver *driver);
+#define ddcci_add_driver(driver) \
+ ddcci_register_driver(THIS_MODULE, driver)
+void ddcci_del_driver(struct ddcci_driver *driver);
+
+struct ddcci_device *ddcci_verify_device(struct device *dev);
+
+#define module_ddcci_driver(__ddcci_driver) \
+ module_driver(__ddcci_driver, ddcci_add_driver, \
+ ddcci_del_driver)
+
+int ddcci_device_write(struct ddcci_device *, bool p_flag, unsigned char *data,
+ unsigned char length);
+int ddcci_device_read(struct ddcci_device *, bool p_flag, unsigned char *buffer,
+ unsigned char length);
+int ddcci_device_writeread(struct ddcci_device *, bool p_flag,
+ unsigned char *buffer, unsigned char length,
+ unsigned char maxlength);
+
+static inline void *ddcci_get_drvdata(const struct ddcci_device *dev)
+{
+ return dev_get_drvdata(&dev->dev);
+}
+
+static inline void ddcci_set_drvdata(struct ddcci_device *dev, void *data)
+{
+ dev_set_drvdata(&dev->dev, data);
+}
+
+unsigned long ddcci_quirks(struct ddcci_device *dev);
+
+const char *ddcci_find_capstr_item(const char *capabilities, const char *tag,
+ size_t *length);
+
+#endif
--
2.25.1
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