kernel 2.6.22.18 omap qpio
doron
doronsa at gmail.com
Mon Mar 8 03:42:16 EST 2010
Hi tao
Yes the processor is OMAP 35XX
The code off the driver:
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
#include <asm/arch/gpio.h>
//#include <asm/gpio.h>
#include <asm/arch/omap34xx.h>
#include <asm/arch/hardware.h>
#include <asm/arch/mux.h>
#include <asm/arch/board.h>
#include <asm/arch/common.h>
#include <asm/arch/keypad.h>
#include <asm/arch/dma.h>
#include <asm/arch/gpmc.h>
#include <asm/arch/twl4030-rtc.h>
#include <asm/arch/mcspi.h>
#include <asm/arch/prcm.h>
static int device_open(struct inode *inode, struct file *file)
{
#ifdef DEBUG
printk(KERN_INFO "device_open(%p)\n", file);
#endif
return 0;
}
static int device_release(struct inode *inode, struct file *file)
{
#ifdef DEBUG
printk(KERN_INFO "device_release(%p,%p)\n", inode, file);
#endif
return 0;
}
static int device_ioctl(struct inode *inode, struct file *file, unsigned int
ioctl_num, unsigned long ioctl_param)
{
int ret_val = 0;
int ret = 0;
struct pin_value *temp_pin, pv;
switch(ioctl_num)
{
case IOCTL_CONFIG_PIN_VALUE:
temp_pin = (struct pin_value*)ioctl_param;
//if (omap_cfg_reg(temp_pin->pin))
if (omap_request_gpio(temp_pin->pin))
{
omap_free_gpio(temp_pin->pin);
}
else{
printk(KERN_INFO "gpio not config(%lu )\n", temp_pin->pin);
ret_val = -1;
goto ioctl_out;
}
break;
case IOCTL_FREE_PIN_VALUE:
temp_pin = (struct pin_value*)ioctl_param;
omap_free_gpio(temp_pin->pin);
printk(KERN_INFO "gpio not free(%lu)\n", temp_pin->pin);
ret_val = -1;
break;
case IOCTL_SET_PIN_VALUE:
temp_pin = (struct pin_value*)ioctl_param;
//printk(KERN_INFO "try to set gpio pin(%lu ) return %d \n",
temp_pin->pin,ret);
omap_request_gpio((int)temp_pin->pin);
omap_set_gpio_direction((int)temp_pin->pin, 0);
//input=1//output=0
if ((int)temp_pin->value)
omap_set_gpio_dataout((int)temp_pin->pin,1);
else
omap_set_gpio_dataout((int)temp_pin->pin,0);
printk(KERN_INFO "gpio set(%lu ) to val %d\n",
temp_pin->pin,temp_pin->value);
//ret = omap_get_gpio_datain((int)temp_pin->pin);
//printk(KERN_INFO "gpio get (%lu ) to val %d\n",
temp_pin->pin,ret);
omap_free_gpio((int)temp_pin->pin);
ret_val = -1;
break;
case IOCTL_GET_PIN_VALUE:
temp_pin = (struct pin_value*)ioctl_param;
pv.pin = temp_pin->pin;
/*
omap_get_gpio_datain(int gpio)
Description: This function is responsible for reading pin
values.
Parameter: int gpio - GPIO PIN (Pin 0-63)
*/
//omap_free_gpio((int)temp_pin->pin);
if (omap_request_gpio(temp_pin->pin)==0)
{
omap_set_gpio_direction(temp_pin->pin, 1);
//input=1//output=0
pv.value = omap_get_gpio_datain(temp_pin->pin);
printk(KERN_INFO "gpio get val (%lu ) to val %d\n",
temp_pin->pin,pv.value);
if (copy_to_user(temp_pin, &pv, sizeof(struct pin_value))
!= 0)
{
ret_val = -1;
goto ioctl_out;
}
omap_free_gpio((int)temp_pin->pin);
//ret_val = pv.value;
//copy_to_user(temp_pin, &pv, sizeof(struct
pin_value));
}
else{
printk(KERN_INFO "gpio not free(%lu )\n",
temp_pin->pin);
ret_val = -1;
goto ioctl_out;
}
break;
case IOCTL_SET_PIN_INPUT:
temp_pin = (struct pin_value*)ioctl_param;
if (omap_request_gpio(temp_pin->pin)==0)
omap_set_gpio_direction(temp_pin->pin, temp_pin->value);
//input=1//output=0
else{
printk(KERN_INFO "gpio not free(%lu )\n", temp_pin->pin);
ret_val = -1;
goto ioctl_out;
}
break;
}
ioctl_out:
//up(&sw_sem);
return ret_val;
}
struct file_operations our_file_ops = {
.ioctl = device_ioctl,
.open = device_open,
.release = device_release,
.owner = THIS_MODULE,
};
int init_module()
{
int ret_val;
ret_val = register_chrdev(MAJOR_NUM, DEVICE_NAME, &our_file_ops);
if (ret_val < 0)
{
printk(KERN_ALERT "device %s failed(%d)\n", DEVICE_NAME, ret_val);
return ret_val;
}
sema_init(&sw_sem, 1);
printk(KERN_INFO "mknod /dev/%s c %d 0\n", DEVICE_NAME, MAJOR_NUM);
/*
omap_cfg_reg(MUX1_1_GPIO113);
omap_cfg_reg(MUX1_2_GPIO114);
omap_cfg_reg(MUX1_3_GPIO115);
ret = omap_request_gpio(MUX1_1_GPIO113);
if (ret < 0)
printk(KERN_ERR "SELECT_MUX1_1: can't reserve GPIO:%d !\n",
MUX1_1_GPIO113);
ret = omap_request_gpio(MUX1_2_GPIO114);
if (ret < 0)
printk(KERN_ERR "SELECT_MUX1_2: can't reserve GPIO:%d !\n",
MUX1_2_GPIO114);
ret = omap_request_gpio(MUX1_3_GPIO115);
if (ret < 0)
printk(KERN_ERR "SELECT_MUX1_3: can't reserve GPIO:%d !\n",
MUX1_3_GPIO115);
*/
return 0;
}
void cleanup_module()
{
unregister_chrdev(MAJOR_NUM, DEVICE_NAME);
}
Regard Doron Sandroy
From: TAO HU [mailto:tghk48 at motorola.com]
Sent: Monday, March 08, 2010 8:45 AM
To: doron
Subject: Re: kernel 2.6.22.18 omap qpio
Are you using OMAP processor?
Can you post the piece of code so people can help
On Wed, Mar 3, 2010 at 4:25 AM, doron <doronsa at gmail.com> wrote:
Hi all
I wrote an driver to the activation of " GPIO " according to the kernel
instructions (gpio.txt) and when I request to free the GPIO I receive always
that the GPIO is reserved .
What the required steps in order to toggle the GPIO MUXED and not MUXED
Regards Doron Sandroy
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--
Best Regards
Hu Tao
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