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Commit 459aedb9 authored by Enric Balletbo i Serra's avatar Enric Balletbo i Serra Committed by Lee Jones
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mfd: cros_ec: Switch to use the new cros-ec-chardev driver 

With the purpose of remove the things that far extends the bounds of
what a MFD was designed to do, instantiate the new platform misc
cros-ec-chardev driver and get rid of all the unneeded code. After this
patch the misc chardev driver is a sub-device of the MFD, and all the
new file operations should be implemented there.
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarGwendal Grignou <gwendal@chromium.org>
Tested-by: default avatarGwendal Grignou <gwendal@chromium.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent eda2e30c
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Showing with 6 additions and 216 deletions
drivers/mfd/cros_ec_dev.c
View file @ 459aedb9
......@@ -5,76 +5,23 @@
* Copyright (C) 2014 Google, Inc.
*/
#include <linux/fs.h>
#include <linux/mfd/core.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_data/cros_ec_chardev.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/platform_data/cros_ec_chardev.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#define DRV_NAME "cros-ec-dev"
/* Device variables */
#define CROS_MAX_DEV 128
static int ec_major;
static struct class cros_class = {
.owner = THIS_MODULE,
.name = "chromeos",
};
/* Basic communication */
static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
{
struct ec_response_get_version *resp;
static const char * const current_image_name[] = {
"unknown", "read-only", "read-write", "invalid",
};
struct cros_ec_command *msg;
int ret;
msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->version = 0;
msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
msg->insize = sizeof(*resp);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
goto exit;
if (msg->result != EC_RES_SUCCESS) {
snprintf(str, maxlen,
"%s\nUnknown EC version: EC returned %d\n",
CROS_EC_DEV_VERSION, msg->result);
ret = -EINVAL;
goto exit;
}
resp = (struct ec_response_get_version *)msg->data;
if (resp->current_image >= ARRAY_SIZE(current_image_name))
resp->current_image = 3; /* invalid */
snprintf(str, maxlen, "%s\n%s\n%s\n%s\n", CROS_EC_DEV_VERSION,
resp->version_string_ro, resp->version_string_rw,
current_image_name[resp->current_image]);
ret = 0;
exit:
kfree(msg);
return ret;
}
static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
{
struct cros_ec_command *msg;
......@@ -110,142 +57,6 @@ static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
}
/* Device file ops */
static int ec_device_open(struct inode *inode, struct file *filp)
{
struct cros_ec_dev *ec = container_of(inode->i_cdev,
struct cros_ec_dev, cdev);
filp->private_data = ec;
nonseekable_open(inode, filp);
return 0;
}
static int ec_device_release(struct inode *inode, struct file *filp)
{
return 0;
}
static ssize_t ec_device_read(struct file *filp, char __user *buffer,
size_t length, loff_t *offset)
{
struct cros_ec_dev *ec = filp->private_data;
char msg[sizeof(struct ec_response_get_version) +
sizeof(CROS_EC_DEV_VERSION)];
size_t count;
int ret;
if (*offset != 0)
return 0;
ret = ec_get_version(ec, msg, sizeof(msg));
if (ret)
return ret;
count = min(length, strlen(msg));
if (copy_to_user(buffer, msg, count))
return -EFAULT;
*offset = count;
return count;
}
/* Ioctls */
static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
{
long ret;
struct cros_ec_command u_cmd;
struct cros_ec_command *s_cmd;
if (copy_from_user(&u_cmd, arg, sizeof(u_cmd)))
return -EFAULT;
if ((u_cmd.outsize > EC_MAX_MSG_BYTES) ||
(u_cmd.insize > EC_MAX_MSG_BYTES))
return -EINVAL;
s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize),
GFP_KERNEL);
if (!s_cmd)
return -ENOMEM;
if (copy_from_user(s_cmd, arg, sizeof(*s_cmd) + u_cmd.outsize)) {
ret = -EFAULT;
goto exit;
}
if (u_cmd.outsize != s_cmd->outsize ||
u_cmd.insize != s_cmd->insize) {
ret = -EINVAL;
goto exit;
}
s_cmd->command += ec->cmd_offset;
ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
/* Only copy data to userland if data was received. */
if (ret < 0)
goto exit;
if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize))
ret = -EFAULT;
exit:
kfree(s_cmd);
return ret;
}
static long ec_device_ioctl_readmem(struct cros_ec_dev *ec, void __user *arg)
{
struct cros_ec_device *ec_dev = ec->ec_dev;
struct cros_ec_readmem s_mem = { };
long num;
/* Not every platform supports direct reads */
if (!ec_dev->cmd_readmem)
return -ENOTTY;
if (copy_from_user(&s_mem, arg, sizeof(s_mem)))
return -EFAULT;
num = ec_dev->cmd_readmem(ec_dev, s_mem.offset, s_mem.bytes,
s_mem.buffer);
if (num <= 0)
return num;
if (copy_to_user((void __user *)arg, &s_mem, sizeof(s_mem)))
return -EFAULT;
return num;
}
static long ec_device_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
struct cros_ec_dev *ec = filp->private_data;
if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC)
return -ENOTTY;
switch (cmd) {
case CROS_EC_DEV_IOCXCMD:
return ec_device_ioctl_xcmd(ec, (void __user *)arg);
case CROS_EC_DEV_IOCRDMEM:
return ec_device_ioctl_readmem(ec, (void __user *)arg);
}
return -ENOTTY;
}
/* Module initialization */
static const struct file_operations fops = {
.open = ec_device_open,
.release = ec_device_release,
.read = ec_device_read,
.unlocked_ioctl = ec_device_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ec_device_ioctl,
#endif
};
static void cros_ec_class_release(struct device *dev)
{
kfree(to_cros_ec_dev(dev));
......@@ -453,6 +264,7 @@ static const struct mfd_cell cros_usbpd_charger_cells[] = {
};
static const struct mfd_cell cros_ec_platform_cells[] = {
{ .name = "cros-ec-chardev" },
{ .name = "cros-ec-debugfs" },
{ .name = "cros-ec-lightbar" },
{ .name = "cros-ec-sysfs" },
......@@ -480,7 +292,6 @@ static int ec_device_probe(struct platform_device *pdev)
ec->features[0] = -1U; /* Not cached yet */
ec->features[1] = -1U; /* Not cached yet */
device_initialize(&ec->class_dev);
cdev_init(&ec->cdev, &fops);
/* Check whether this is actually a Fingerprint MCU rather than an EC */
if (cros_ec_check_features(ec, EC_FEATURE_FINGERPRINT)) {
......@@ -527,10 +338,7 @@ static int ec_device_probe(struct platform_device *pdev)
/*
* Add the class device
* Link to the character device for creating the /dev entry
* in devtmpfs.
*/
ec->class_dev.devt = MKDEV(ec_major, pdev->id);
ec->class_dev.class = &cros_class;
ec->class_dev.parent = dev;
ec->class_dev.release = cros_ec_class_release;
......@@ -541,6 +349,10 @@ static int ec_device_probe(struct platform_device *pdev)
goto failed;
}
retval = device_add(&ec->class_dev);
if (retval)
goto failed;
/* check whether this EC is a sensor hub. */
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
cros_ec_sensors_register(ec);
......@@ -584,13 +396,6 @@ static int ec_device_probe(struct platform_device *pdev)
retval);
}
/* We can now add the sysfs class, we know which parameter to show */
retval = cdev_device_add(&ec->cdev, &ec->class_dev);
if (retval) {
dev_err(dev, "cdev_device_add failed => %d\n", retval);
goto failed;
}
retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
cros_ec_platform_cells,
ARRAY_SIZE(cros_ec_platform_cells),
......@@ -624,7 +429,6 @@ static int ec_device_remove(struct platform_device *pdev)
struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
mfd_remove_devices(ec->dev);
cdev_del(&ec->cdev);
device_unregister(&ec->class_dev);
return 0;
}
......@@ -647,7 +451,6 @@ static struct platform_driver cros_ec_dev_driver = {
static int __init cros_ec_dev_init(void)
{
int ret;
dev_t dev = 0;
ret = class_register(&cros_class);
if (ret) {
......@@ -655,14 +458,6 @@ static int __init cros_ec_dev_init(void)
return ret;
}
/* Get a range of minor numbers (starting with 0) to work with */
ret = alloc_chrdev_region(&dev, 0, CROS_MAX_DEV, CROS_EC_DEV_NAME);
if (ret < 0) {
pr_err(CROS_EC_DEV_NAME ": alloc_chrdev_region() failed\n");
goto failed_chrdevreg;
}
ec_major = MAJOR(dev);
/* Register the driver */
ret = platform_driver_register(&cros_ec_dev_driver);
if (ret < 0) {
......@@ -672,8 +467,6 @@ static int __init cros_ec_dev_init(void)
return 0;
failed_devreg:
unregister_chrdev_region(MKDEV(ec_major, 0), CROS_MAX_DEV);
failed_chrdevreg:
class_unregister(&cros_class);
return ret;
}
......@@ -681,7 +474,6 @@ static int __init cros_ec_dev_init(void)
static void __exit cros_ec_dev_exit(void)
{
platform_driver_unregister(&cros_ec_dev_driver);
unregister_chrdev(ec_major, CROS_EC_DEV_NAME);
class_unregister(&cros_class);
}
......
include/linux/mfd/cros_ec.h
View file @ 459aedb9
......@@ -192,7 +192,6 @@ struct cros_ec_debugfs;
/**
* struct cros_ec_dev - ChromeOS EC device entry point.
* @class_dev: Device structure used in sysfs.
* @cdev: Character device structure in /dev.
* @ec_dev: cros_ec_device structure to talk to the physical device.
* @dev: Pointer to the platform device.
* @debug_info: cros_ec_debugfs structure for debugging information.
......@@ -202,7 +201,6 @@ struct cros_ec_debugfs;
*/
struct cros_ec_dev {
struct device class_dev;
struct cdev cdev;
struct cros_ec_device *ec_dev;
struct device *dev;
struct cros_ec_debugfs *debug_info;
......
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