linux/drivers/misc/c2port/core.c
Lee Jones e8f50d4bfc misc: c2port: core: Make copying name from userspace more secure
Currently the 'c2dev' device data is not initialised when it's
allocated.  There maybe an issue when using strncpy() to populate the
'name' attribute since a NUL terminator may not be provided in all
use-cases.  To prevent such a failing, let's ensure the 'c2dev'
device data area is fully zeroed out on allocation.

Cc: Rodolfo Giometti <giometti@enneenne.com>
Cc: "Eurotech S.p.A" <info@eurotech.it>
Cc: David Laight <David.Laight@aculab.com>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201102142001.560490-1-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-03 10:12:10 +01:00

1001 lines
21 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Silicon Labs C2 port core Linux support
*
* Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
* Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/c2port.h>
#define DRIVER_NAME "c2port"
#define DRIVER_VERSION "0.51.0"
static DEFINE_SPINLOCK(c2port_idr_lock);
static DEFINE_IDR(c2port_idr);
/*
* Local variables
*/
static struct class *c2port_class;
/*
* C2 registers & commands defines
*/
/* C2 registers */
#define C2PORT_DEVICEID 0x00
#define C2PORT_REVID 0x01
#define C2PORT_FPCTL 0x02
#define C2PORT_FPDAT 0xB4
/* C2 interface commands */
#define C2PORT_GET_VERSION 0x01
#define C2PORT_DEVICE_ERASE 0x03
#define C2PORT_BLOCK_READ 0x06
#define C2PORT_BLOCK_WRITE 0x07
#define C2PORT_PAGE_ERASE 0x08
/* C2 status return codes */
#define C2PORT_INVALID_COMMAND 0x00
#define C2PORT_COMMAND_FAILED 0x02
#define C2PORT_COMMAND_OK 0x0d
/*
* C2 port low level signal managements
*/
static void c2port_reset(struct c2port_device *dev)
{
struct c2port_ops *ops = dev->ops;
/* To reset the device we have to keep clock line low for at least
* 20us.
*/
local_irq_disable();
ops->c2ck_set(dev, 0);
udelay(25);
ops->c2ck_set(dev, 1);
local_irq_enable();
udelay(1);
}
static void c2port_strobe_ck(struct c2port_device *dev)
{
struct c2port_ops *ops = dev->ops;
/* During hi-low-hi transition we disable local IRQs to avoid
* interructions since C2 port specification says that it must be
* shorter than 5us, otherwise the microcontroller may consider
* it as a reset signal!
*/
local_irq_disable();
ops->c2ck_set(dev, 0);
udelay(1);
ops->c2ck_set(dev, 1);
local_irq_enable();
udelay(1);
}
/*
* C2 port basic functions
*/
static void c2port_write_ar(struct c2port_device *dev, u8 addr)
{
struct c2port_ops *ops = dev->ops;
int i;
/* START field */
c2port_strobe_ck(dev);
/* INS field (11b, LSB first) */
ops->c2d_dir(dev, 0);
ops->c2d_set(dev, 1);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 1);
c2port_strobe_ck(dev);
/* ADDRESS field */
for (i = 0; i < 8; i++) {
ops->c2d_set(dev, addr & 0x01);
c2port_strobe_ck(dev);
addr >>= 1;
}
/* STOP field */
ops->c2d_dir(dev, 1);
c2port_strobe_ck(dev);
}
static int c2port_read_ar(struct c2port_device *dev, u8 *addr)
{
struct c2port_ops *ops = dev->ops;
int i;
/* START field */
c2port_strobe_ck(dev);
/* INS field (10b, LSB first) */
ops->c2d_dir(dev, 0);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 1);
c2port_strobe_ck(dev);
/* ADDRESS field */
ops->c2d_dir(dev, 1);
*addr = 0;
for (i = 0; i < 8; i++) {
*addr >>= 1; /* shift in 8-bit ADDRESS field LSB first */
c2port_strobe_ck(dev);
if (ops->c2d_get(dev))
*addr |= 0x80;
}
/* STOP field */
c2port_strobe_ck(dev);
return 0;
}
static int c2port_write_dr(struct c2port_device *dev, u8 data)
{
struct c2port_ops *ops = dev->ops;
int timeout, i;
/* START field */
c2port_strobe_ck(dev);
/* INS field (01b, LSB first) */
ops->c2d_dir(dev, 0);
ops->c2d_set(dev, 1);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
/* LENGTH field (00b, LSB first -> 1 byte) */
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
/* DATA field */
for (i = 0; i < 8; i++) {
ops->c2d_set(dev, data & 0x01);
c2port_strobe_ck(dev);
data >>= 1;
}
/* WAIT field */
ops->c2d_dir(dev, 1);
timeout = 20;
do {
c2port_strobe_ck(dev);
if (ops->c2d_get(dev))
break;
udelay(1);
} while (--timeout > 0);
if (timeout == 0)
return -EIO;
/* STOP field */
c2port_strobe_ck(dev);
return 0;
}
static int c2port_read_dr(struct c2port_device *dev, u8 *data)
{
struct c2port_ops *ops = dev->ops;
int timeout, i;
/* START field */
c2port_strobe_ck(dev);
/* INS field (00b, LSB first) */
ops->c2d_dir(dev, 0);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
/* LENGTH field (00b, LSB first -> 1 byte) */
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
ops->c2d_set(dev, 0);
c2port_strobe_ck(dev);
/* WAIT field */
ops->c2d_dir(dev, 1);
timeout = 20;
do {
c2port_strobe_ck(dev);
if (ops->c2d_get(dev))
break;
udelay(1);
} while (--timeout > 0);
if (timeout == 0)
return -EIO;
/* DATA field */
*data = 0;
for (i = 0; i < 8; i++) {
*data >>= 1; /* shift in 8-bit DATA field LSB first */
c2port_strobe_ck(dev);
if (ops->c2d_get(dev))
*data |= 0x80;
}
/* STOP field */
c2port_strobe_ck(dev);
return 0;
}
static int c2port_poll_in_busy(struct c2port_device *dev)
{
u8 addr;
int ret, timeout = 20;
do {
ret = (c2port_read_ar(dev, &addr));
if (ret < 0)
return -EIO;
if (!(addr & 0x02))
break;
udelay(1);
} while (--timeout > 0);
if (timeout == 0)
return -EIO;
return 0;
}
static int c2port_poll_out_ready(struct c2port_device *dev)
{
u8 addr;
int ret, timeout = 10000; /* erase flash needs long time... */
do {
ret = (c2port_read_ar(dev, &addr));
if (ret < 0)
return -EIO;
if (addr & 0x01)
break;
udelay(1);
} while (--timeout > 0);
if (timeout == 0)
return -EIO;
return 0;
}
/*
* sysfs methods
*/
static ssize_t c2port_show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", c2dev->name);
}
static DEVICE_ATTR(name, 0444, c2port_show_name, NULL);
static ssize_t c2port_show_flash_blocks_num(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
struct c2port_ops *ops = c2dev->ops;
return sprintf(buf, "%d\n", ops->blocks_num);
}
static DEVICE_ATTR(flash_blocks_num, 0444, c2port_show_flash_blocks_num, NULL);
static ssize_t c2port_show_flash_block_size(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
struct c2port_ops *ops = c2dev->ops;
return sprintf(buf, "%d\n", ops->block_size);
}
static DEVICE_ATTR(flash_block_size, 0444, c2port_show_flash_block_size, NULL);
static ssize_t c2port_show_flash_size(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
struct c2port_ops *ops = c2dev->ops;
return sprintf(buf, "%d\n", ops->blocks_num * ops->block_size);
}
static DEVICE_ATTR(flash_size, 0444, c2port_show_flash_size, NULL);
static ssize_t access_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", c2dev->access);
}
static ssize_t access_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
struct c2port_ops *ops = c2dev->ops;
int status, ret;
ret = sscanf(buf, "%d", &status);
if (ret != 1)
return -EINVAL;
mutex_lock(&c2dev->mutex);
c2dev->access = !!status;
/* If access is "on" clock should be HIGH _before_ setting the line
* as output and data line should be set as INPUT anyway */
if (c2dev->access)
ops->c2ck_set(c2dev, 1);
ops->access(c2dev, c2dev->access);
if (c2dev->access)
ops->c2d_dir(c2dev, 1);
mutex_unlock(&c2dev->mutex);
return count;
}
static DEVICE_ATTR_RW(access);
static ssize_t c2port_store_reset(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
/* Check the device access status */
if (!c2dev->access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
c2port_reset(c2dev);
c2dev->flash_access = 0;
mutex_unlock(&c2dev->mutex);
return count;
}
static DEVICE_ATTR(reset, 0200, NULL, c2port_store_reset);
static ssize_t __c2port_show_dev_id(struct c2port_device *dev, char *buf)
{
u8 data;
int ret;
/* Select DEVICEID register for C2 data register accesses */
c2port_write_ar(dev, C2PORT_DEVICEID);
/* Read and return the device ID register */
ret = c2port_read_dr(dev, &data);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", data);
}
static ssize_t c2port_show_dev_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
ssize_t ret;
/* Check the device access status */
if (!c2dev->access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
ret = __c2port_show_dev_id(c2dev, buf);
mutex_unlock(&c2dev->mutex);
if (ret < 0)
dev_err(dev, "cannot read from %s\n", c2dev->name);
return ret;
}
static DEVICE_ATTR(dev_id, 0444, c2port_show_dev_id, NULL);
static ssize_t __c2port_show_rev_id(struct c2port_device *dev, char *buf)
{
u8 data;
int ret;
/* Select REVID register for C2 data register accesses */
c2port_write_ar(dev, C2PORT_REVID);
/* Read and return the revision ID register */
ret = c2port_read_dr(dev, &data);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", data);
}
static ssize_t c2port_show_rev_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
ssize_t ret;
/* Check the device access status */
if (!c2dev->access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
ret = __c2port_show_rev_id(c2dev, buf);
mutex_unlock(&c2dev->mutex);
if (ret < 0)
dev_err(c2dev->dev, "cannot read from %s\n", c2dev->name);
return ret;
}
static DEVICE_ATTR(rev_id, 0444, c2port_show_rev_id, NULL);
static ssize_t c2port_show_flash_access(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", c2dev->flash_access);
}
static ssize_t __c2port_store_flash_access(struct c2port_device *dev,
int status)
{
int ret;
/* Check the device access status */
if (!dev->access)
return -EBUSY;
dev->flash_access = !!status;
/* If flash_access is off we have nothing to do... */
if (dev->flash_access == 0)
return 0;
/* Target the C2 flash programming control register for C2 data
* register access */
c2port_write_ar(dev, C2PORT_FPCTL);
/* Write the first keycode to enable C2 Flash programming */
ret = c2port_write_dr(dev, 0x02);
if (ret < 0)
return ret;
/* Write the second keycode to enable C2 Flash programming */
ret = c2port_write_dr(dev, 0x01);
if (ret < 0)
return ret;
/* Delay for at least 20ms to ensure the target is ready for
* C2 flash programming */
mdelay(25);
return 0;
}
static ssize_t c2port_store_flash_access(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
int status;
ssize_t ret;
ret = sscanf(buf, "%d", &status);
if (ret != 1)
return -EINVAL;
mutex_lock(&c2dev->mutex);
ret = __c2port_store_flash_access(c2dev, status);
mutex_unlock(&c2dev->mutex);
if (ret < 0) {
dev_err(c2dev->dev, "cannot enable %s flash programming\n",
c2dev->name);
return ret;
}
return count;
}
static DEVICE_ATTR(flash_access, 0644, c2port_show_flash_access,
c2port_store_flash_access);
static ssize_t __c2port_write_flash_erase(struct c2port_device *dev)
{
u8 status;
int ret;
/* Target the C2 flash programming data register for C2 data register
* access.
*/
c2port_write_ar(dev, C2PORT_FPDAT);
/* Send device erase command */
c2port_write_dr(dev, C2PORT_DEVICE_ERASE);
/* Wait for input acknowledge */
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Should check status before starting FLASH access sequence */
/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
/* Send a three-byte arming sequence to enable the device erase.
* If the sequence is not received correctly, the command will be
* ignored.
* Sequence is: 0xde, 0xad, 0xa5.
*/
c2port_write_dr(dev, 0xde);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
c2port_write_dr(dev, 0xad);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
c2port_write_dr(dev, 0xa5);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
return 0;
}
static ssize_t c2port_store_flash_erase(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(dev);
int ret;
/* Check the device and flash access status */
if (!c2dev->access || !c2dev->flash_access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
ret = __c2port_write_flash_erase(c2dev);
mutex_unlock(&c2dev->mutex);
if (ret < 0) {
dev_err(c2dev->dev, "cannot erase %s flash\n", c2dev->name);
return ret;
}
return count;
}
static DEVICE_ATTR(flash_erase, 0200, NULL, c2port_store_flash_erase);
static ssize_t __c2port_read_flash_data(struct c2port_device *dev,
char *buffer, loff_t offset, size_t count)
{
struct c2port_ops *ops = dev->ops;
u8 status, nread = 128;
int i, ret;
/* Check for flash end */
if (offset >= ops->block_size * ops->blocks_num)
return 0;
if (ops->block_size * ops->blocks_num - offset < nread)
nread = ops->block_size * ops->blocks_num - offset;
if (count < nread)
nread = count;
if (nread == 0)
return nread;
/* Target the C2 flash programming data register for C2 data register
* access */
c2port_write_ar(dev, C2PORT_FPDAT);
/* Send flash block read command */
c2port_write_dr(dev, C2PORT_BLOCK_READ);
/* Wait for input acknowledge */
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Should check status before starting FLASH access sequence */
/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
/* Send address high byte */
c2port_write_dr(dev, offset >> 8);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Send address low byte */
c2port_write_dr(dev, offset & 0x00ff);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Send address block size */
c2port_write_dr(dev, nread);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Should check status before reading FLASH block */
/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
/* Read flash block */
for (i = 0; i < nread; i++) {
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
ret = c2port_read_dr(dev, buffer+i);
if (ret < 0)
return ret;
}
return nread;
}
static ssize_t c2port_read_flash_data(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buffer, loff_t offset, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(kobj_to_dev(kobj));
ssize_t ret;
/* Check the device and flash access status */
if (!c2dev->access || !c2dev->flash_access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
ret = __c2port_read_flash_data(c2dev, buffer, offset, count);
mutex_unlock(&c2dev->mutex);
if (ret < 0)
dev_err(c2dev->dev, "cannot read %s flash\n", c2dev->name);
return ret;
}
static ssize_t __c2port_write_flash_data(struct c2port_device *dev,
char *buffer, loff_t offset, size_t count)
{
struct c2port_ops *ops = dev->ops;
u8 status, nwrite = 128;
int i, ret;
if (nwrite > count)
nwrite = count;
if (ops->block_size * ops->blocks_num - offset < nwrite)
nwrite = ops->block_size * ops->blocks_num - offset;
/* Check for flash end */
if (offset >= ops->block_size * ops->blocks_num)
return -EINVAL;
/* Target the C2 flash programming data register for C2 data register
* access */
c2port_write_ar(dev, C2PORT_FPDAT);
/* Send flash block write command */
c2port_write_dr(dev, C2PORT_BLOCK_WRITE);
/* Wait for input acknowledge */
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Should check status before starting FLASH access sequence */
/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
/* Send address high byte */
c2port_write_dr(dev, offset >> 8);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Send address low byte */
c2port_write_dr(dev, offset & 0x00ff);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Send address block size */
c2port_write_dr(dev, nwrite);
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
/* Should check status before writing FLASH block */
/* Wait for status information */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
/* Read flash programming interface status */
ret = c2port_read_dr(dev, &status);
if (ret < 0)
return ret;
if (status != C2PORT_COMMAND_OK)
return -EBUSY;
/* Write flash block */
for (i = 0; i < nwrite; i++) {
ret = c2port_write_dr(dev, *(buffer+i));
if (ret < 0)
return ret;
ret = c2port_poll_in_busy(dev);
if (ret < 0)
return ret;
}
/* Wait for last flash write to complete */
ret = c2port_poll_out_ready(dev);
if (ret < 0)
return ret;
return nwrite;
}
static ssize_t c2port_write_flash_data(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buffer, loff_t offset, size_t count)
{
struct c2port_device *c2dev = dev_get_drvdata(kobj_to_dev(kobj));
int ret;
/* Check the device access status */
if (!c2dev->access || !c2dev->flash_access)
return -EBUSY;
mutex_lock(&c2dev->mutex);
ret = __c2port_write_flash_data(c2dev, buffer, offset, count);
mutex_unlock(&c2dev->mutex);
if (ret < 0)
dev_err(c2dev->dev, "cannot write %s flash\n", c2dev->name);
return ret;
}
/* size is computed at run-time */
static BIN_ATTR(flash_data, 0644, c2port_read_flash_data,
c2port_write_flash_data, 0);
/*
* Class attributes
*/
static struct attribute *c2port_attrs[] = {
&dev_attr_name.attr,
&dev_attr_flash_blocks_num.attr,
&dev_attr_flash_block_size.attr,
&dev_attr_flash_size.attr,
&dev_attr_access.attr,
&dev_attr_reset.attr,
&dev_attr_dev_id.attr,
&dev_attr_rev_id.attr,
&dev_attr_flash_access.attr,
&dev_attr_flash_erase.attr,
NULL,
};
static struct bin_attribute *c2port_bin_attrs[] = {
&bin_attr_flash_data,
NULL,
};
static const struct attribute_group c2port_group = {
.attrs = c2port_attrs,
.bin_attrs = c2port_bin_attrs,
};
static const struct attribute_group *c2port_groups[] = {
&c2port_group,
NULL,
};
/*
* Exported functions
*/
struct c2port_device *c2port_device_register(char *name,
struct c2port_ops *ops, void *devdata)
{
struct c2port_device *c2dev;
int ret;
if (unlikely(!ops) || unlikely(!ops->access) || \
unlikely(!ops->c2d_dir) || unlikely(!ops->c2ck_set) || \
unlikely(!ops->c2d_get) || unlikely(!ops->c2d_set))
return ERR_PTR(-EINVAL);
c2dev = kzalloc(sizeof(struct c2port_device), GFP_KERNEL);
if (unlikely(!c2dev))
return ERR_PTR(-ENOMEM);
idr_preload(GFP_KERNEL);
spin_lock_irq(&c2port_idr_lock);
ret = idr_alloc(&c2port_idr, c2dev, 0, 0, GFP_NOWAIT);
spin_unlock_irq(&c2port_idr_lock);
idr_preload_end();
if (ret < 0)
goto error_idr_alloc;
c2dev->id = ret;
bin_attr_flash_data.size = ops->blocks_num * ops->block_size;
c2dev->dev = device_create(c2port_class, NULL, 0, c2dev,
"c2port%d", c2dev->id);
if (IS_ERR(c2dev->dev)) {
ret = PTR_ERR(c2dev->dev);
goto error_device_create;
}
dev_set_drvdata(c2dev->dev, c2dev);
strncpy(c2dev->name, name, C2PORT_NAME_LEN - 1);
c2dev->ops = ops;
mutex_init(&c2dev->mutex);
/* By default C2 port access is off */
c2dev->access = c2dev->flash_access = 0;
ops->access(c2dev, 0);
dev_info(c2dev->dev, "C2 port %s added\n", name);
dev_info(c2dev->dev, "%s flash has %d blocks x %d bytes "
"(%d bytes total)\n",
name, ops->blocks_num, ops->block_size,
ops->blocks_num * ops->block_size);
return c2dev;
error_device_create:
spin_lock_irq(&c2port_idr_lock);
idr_remove(&c2port_idr, c2dev->id);
spin_unlock_irq(&c2port_idr_lock);
error_idr_alloc:
kfree(c2dev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(c2port_device_register);
void c2port_device_unregister(struct c2port_device *c2dev)
{
if (!c2dev)
return;
dev_info(c2dev->dev, "C2 port %s removed\n", c2dev->name);
spin_lock_irq(&c2port_idr_lock);
idr_remove(&c2port_idr, c2dev->id);
spin_unlock_irq(&c2port_idr_lock);
device_destroy(c2port_class, c2dev->id);
kfree(c2dev);
}
EXPORT_SYMBOL(c2port_device_unregister);
/*
* Module stuff
*/
static int __init c2port_init(void)
{
printk(KERN_INFO "Silicon Labs C2 port support v. " DRIVER_VERSION
" - (C) 2007 Rodolfo Giometti\n");
c2port_class = class_create(THIS_MODULE, "c2port");
if (IS_ERR(c2port_class)) {
printk(KERN_ERR "c2port: failed to allocate class\n");
return PTR_ERR(c2port_class);
}
c2port_class->dev_groups = c2port_groups;
return 0;
}
static void __exit c2port_exit(void)
{
class_destroy(c2port_class);
}
module_init(c2port_init);
module_exit(c2port_exit);
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("Silicon Labs C2 port support v. " DRIVER_VERSION);
MODULE_LICENSE("GPL");