kernel 2.6.22.18 omap qpio

[tghk48@motorola.com (TAO HU)]

I assume the error you referred to is as below.

omap_cfg_reg(MUX1_1_GPIO113);
... ...
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);

Pls don't be confused by MUX setting and GPIO operation.

Calling GPIO API (omap_request_gpio() etc.) is independent of MUX
setting though they have functional dependency.
It means that the number passed to omap_request_gpio() should be GPIO#
(113 in this case).

So the correct code should be
omap_cfg_reg(MUX1_1_GPIO113);
... ...
ret = omap_request_gpio(113);



On Mon, Mar 8, 2010 at 4:42 PM, doron <doronsa@gmail.com> wrote:
>
> 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@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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> linux-arm-kernel at lists.infradead.org
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>
>
> --
> Best Regards
> Hu Tao
>



--
Best Regards
Hu Tao