mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Chris Wright](/assets/img/avatar_default.png)
This allows bin_attr->read,write,mmap callbacks to check file specific data (such as inode owner) as part of any privilege validation. Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1006 lines
22 KiB
C
1006 lines
22 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation
|
|
*/
|
|
|
|
#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/kmemcheck.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 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 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 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 ssize_t c2port_show_access(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 c2port_store_access(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 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 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 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 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 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 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(container_of(kobj,
|
|
struct device, 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(container_of(kobj,
|
|
struct device, 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;
|
|
}
|
|
|
|
/*
|
|
* Class attributes
|
|
*/
|
|
|
|
static struct device_attribute c2port_attrs[] = {
|
|
__ATTR(name, 0444, c2port_show_name, NULL),
|
|
__ATTR(flash_blocks_num, 0444, c2port_show_flash_blocks_num, NULL),
|
|
__ATTR(flash_block_size, 0444, c2port_show_flash_block_size, NULL),
|
|
__ATTR(flash_size, 0444, c2port_show_flash_size, NULL),
|
|
__ATTR(access, 0644, c2port_show_access, c2port_store_access),
|
|
__ATTR(reset, 0200, NULL, c2port_store_reset),
|
|
__ATTR(dev_id, 0444, c2port_show_dev_id, NULL),
|
|
__ATTR(rev_id, 0444, c2port_show_rev_id, NULL),
|
|
|
|
__ATTR(flash_access, 0644, c2port_show_flash_access,
|
|
c2port_store_flash_access),
|
|
__ATTR(flash_erase, 0200, NULL, c2port_store_flash_erase),
|
|
__ATTR_NULL,
|
|
};
|
|
|
|
static struct bin_attribute c2port_bin_attrs = {
|
|
.attr = {
|
|
.name = "flash_data",
|
|
.mode = 0644
|
|
},
|
|
.read = c2port_read_flash_data,
|
|
.write = c2port_write_flash_data,
|
|
/* .size is computed at run-time */
|
|
};
|
|
|
|
/*
|
|
* Exported functions
|
|
*/
|
|
|
|
struct c2port_device *c2port_device_register(char *name,
|
|
struct c2port_ops *ops, void *devdata)
|
|
{
|
|
struct c2port_device *c2dev;
|
|
int id, 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 = kmalloc(sizeof(struct c2port_device), GFP_KERNEL);
|
|
kmemcheck_annotate_bitfield(c2dev, flags);
|
|
if (unlikely(!c2dev))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = idr_pre_get(&c2port_idr, GFP_KERNEL);
|
|
if (!ret) {
|
|
ret = -ENOMEM;
|
|
goto error_idr_get_new;
|
|
}
|
|
|
|
spin_lock_irq(&c2port_idr_lock);
|
|
ret = idr_get_new(&c2port_idr, c2dev, &id);
|
|
spin_unlock_irq(&c2port_idr_lock);
|
|
|
|
if (ret < 0)
|
|
goto error_idr_get_new;
|
|
c2dev->id = id;
|
|
|
|
c2dev->dev = device_create(c2port_class, NULL, 0, c2dev,
|
|
"c2port%d", id);
|
|
if (unlikely(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);
|
|
c2dev->ops = ops;
|
|
mutex_init(&c2dev->mutex);
|
|
|
|
/* Create binary file */
|
|
c2port_bin_attrs.size = ops->blocks_num * ops->block_size;
|
|
ret = device_create_bin_file(c2dev->dev, &c2port_bin_attrs);
|
|
if (unlikely(ret))
|
|
goto error_device_create_bin_file;
|
|
|
|
/* 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_bin_file:
|
|
device_destroy(c2port_class, 0);
|
|
|
|
error_device_create:
|
|
spin_lock_irq(&c2port_idr_lock);
|
|
idr_remove(&c2port_idr, id);
|
|
spin_unlock_irq(&c2port_idr_lock);
|
|
|
|
error_idr_get_new:
|
|
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);
|
|
|
|
device_remove_bin_file(c2dev->dev, &c2port_bin_attrs);
|
|
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 (!c2port_class) {
|
|
printk(KERN_ERR "c2port: failed to allocate class\n");
|
|
return -ENOMEM;
|
|
}
|
|
c2port_class->dev_attrs = c2port_attrs;
|
|
|
|
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");
|