📄 立宇泰嵌入式系统技术论坛-嵌入式操作系统相关-菜鸟写给菜鸟参考的44b0x_iic驱动程序.htm
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0;<BR><BR>}<BR><BR><BR><BR>int __init init_i2c_<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44b0x</B>(void)<BR><BR>{<BR><BR> int
result;<BR><BR><BR><BR> printk("i2c_<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44b0x</B>. I2C
driver module for S3C<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44B0X</B>\n");<BR><BR><BR><BR> i2c_initialized
= 0;<BR><BR> if(result =
register_chrdev(I2C_MAJOR,"i2c",&i2c_fops))<BR><BR> {<BR><BR> printk("i2c_<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44b0x</B>. unable to
get major %d for I2C support for S3C<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44B0X</B>\n",
I2C_MAJOR);<BR><BR> return
result;<BR><BR> }<BR><BR> if(result
= request_irq(INT_I2C, i2c_irq_service, SA_INTERRUPT, "i2c",
NULL))<BR><BR> {<BR><BR> printk("Request
IRQ for I2C interface
failure.\n");<BR><BR> return
result;<BR><BR> }<BR><BR> i2c_initialized++;<BR><BR> INT_ENABLE(INT_I2C);<BR><BR><BR><BR> return
0;<BR><BR>}<BR><BR><BR><BR>static void i2c_irq_service(int irq,void
*dev_id,struct pt_regs
*regs)<BR><BR>{<BR><BR> switch(i2c_oper_mode)<BR><BR> {<BR><BR> case
<B
style="COLOR: black; BACKGROUND-COLOR: #a0ffff">IIC</B>_TRANSMIT:<BR><BR> if(i2c_buf_ptr
>=
i2c_buf_count)<BR><BR> {<BR><BR>
<BR> IICSTAT =
0xD0; <BR>// Stop
transmition<BR><BR> IICCON
&=
0xEF;<BR><BR>
<BR>
<BR>wake_up_interruptible(&i2c_queue); //
Wake up<BR>i2c_write
function<BR><BR> break;<BR><BR> }<BR><BR> IICDS
=
i2c_buf[i2c_buf_ptr++];<BR><BR> IICCON
&=<BR>0xEF; //
Resume<BR>I2C
operation<BR><BR> break;<BR><BR> case
<B
style="COLOR: black; BACKGROUND-COLOR: #a0ffff">IIC</B>_RECEIVE:<BR><BR> if(i2c_buf_ptr<BR>==
i2c_buf_count-1) //
Last
byte<BR><BR> {<BR><BR> i2c_buf[i2c_buf_ptr++]
=
IICDS;<BR><BR>
<BR> IICCON &= 0x6F;
<BR> //
NACK<BR><BR> break;<BR><BR> }<BR><BR> if(i2c_buf_ptr
>=
i2c_buf_count)<BR><BR> {<BR><BR>
<BR> IICSTAT =
0x90; <BR>// Stop
receive<BR><BR> IICCON
&=
0xEF;<BR><BR>
<BR>
<BR>wake_up_interruptible(&i2c_queue); //
Wake up<BR>i2c_read
function<BR><BR> break;<BR><BR> }<BR><BR> i2c_buf[i2c_buf_ptr++]
=
IICDS;<BR><BR> IICCON
&=<BR>0xEF; //
Resume<BR>I2C
operation<BR><BR> break;<BR><BR> case
<B
style="COLOR: black; BACKGROUND-COLOR: #a0ffff">IIC</B>_RD_ADDR:<BR><BR> i2c_oper_mode
= <B
style="COLOR: black; BACKGROUND-COLOR: #a0ffff">IIC</B>_RECEIVE;<BR><BR> IICCON
&=<BR>0xEF; //
Resume<BR>I2C
operation<BR><BR> break;<BR><BR> default:<BR><BR> }<BR><BR>}<BR><BR><BR><BR>#ifdef
MODULE<BR><BR>int
i2c_exit(void)<BR><BR>{<BR><BR> int
result;<BR><BR><BR><BR> if (i2c_initialized
>=
1)<BR><BR> {<BR><BR> if(result
=
unregister_chrdev(I2C_MAJOR,"i2c"))<BR><BR> {<BR><BR>
<BR>printk("i2c_440bx. unable to release major %d for i2c
bus\n",<BR>I2C_MAJOR);<BR><BR> return
result;<BR><BR> }<BR><BR> }<BR><BR> i2c_initialized--;<BR><BR> return
0;<BR><BR>}<BR><BR>#endif<BR><BR><BR><BR>EXPORT_NO_SYMBOLS;<BR><BR><BR><BR>#ifdef
MODULE<BR><BR><BR><BR>MODULE_AUTHOR("Yong F Wang
com_wang@21cn.com");<BR><BR>MODULE_DESCRIPTION("I2C for S3C<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44B0X</B> /dev
entries driver");<BR><BR>MODULE_LICENSE("GPL");<BR><BR><BR><BR>int
init_module(void)<BR><BR>{<BR><BR> return
init_i2c_<B
style="COLOR: black; BACKGROUND-COLOR: #ffff66">44b0x</B>();<BR><BR>}<BR><BR><BR><BR>int
cleanup_module(void)<BR><BR>{<BR><BR> return
i2c_exit();<BR><BR>}<BR><BR><BR><BR>#endif /* def MODULE
*/<BR><BR><BR><BR><BR>
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