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GPIO driver: register all pintypes as generic /dev/gpioN

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This commit is contained in:
Jari van Ewijk
2021-12-09 20:05:20 +01:00
committed by Xiang Xiao
parent efc949bceb
commit 2e47ef32cf
9 changed files with 142 additions and 96 deletions
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drivers/ioexpander/gpio.c
+76 -52
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@@ -315,6 +315,7 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
inode = filep->f_inode;
DEBUGASSERT(inode->i_private != NULL);
dev = inode->i_private;
DEBUGASSERT(dev->gp_ops != NULL);
switch (cmd)
{
@@ -328,6 +329,7 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
dev->gp_pintype == GPIO_OUTPUT_PIN_OPENDRAIN)
{
DEBUGASSERT(arg == 0ul || arg == 1ul);
DEBUGASSERT(dev->gp_ops->go_write != NULL);
ret = dev->gp_ops->go_write(dev, (bool)arg);
}
else
@@ -347,6 +349,7 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
FAR bool *ptr = (FAR bool *)((uintptr_t)arg);
DEBUGASSERT(ptr != NULL);
DEBUGASSERT(dev->gp_ops->go_read != NULL);
ret = dev->gp_ops->go_read(dev, ptr);
DEBUGASSERT(ret < 0 || *ptr == 0 || *ptr == 1);
}
@@ -402,12 +405,14 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
/* Register our handler */
DEBUGASSERT(dev->gp_ops->go_attach != NULL);
ret = dev->gp_ops->go_attach(dev,
(pin_interrupt_t)gpio_handler);
if (ret >= 0)
{
/* Enable pin interrupts */
DEBUGASSERT(dev->gp_ops->go_enable != NULL);
ret = dev->gp_ops->go_enable(dev, true);
}
}
@@ -463,11 +468,13 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
/* Make sure that the pin interrupt is disabled */
DEBUGASSERT(dev->gp_ops->go_enable != NULL);
ret = dev->gp_ops->go_enable(dev, false);
if (ret >= 0)
{
/* Detach the handler */
DEBUGASSERT(dev->gp_ops->go_attach != NULL);
ret = dev->gp_ops->go_attach(dev, NULL);
}
}
@@ -489,7 +496,65 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
case GPIOC_SETPINTYPE:
{
ret = dev->gp_ops->go_setpintype(dev, arg);
enum gpio_pintype_e pintype = (enum gpio_pintype_e)arg;
/* Check if the argument is a valid pintype */
if (pintype < GPIO_INPUT_PIN || pintype >= GPIO_NPINTYPES)
{
ret = -EINVAL;
break;
}
/* Check if the pintype actually needs to be changed */
if (dev->gp_pintype == pintype)
{
/* Pintype remains the same, no need to change anything */
ret = OK;
break;
}
/* Disable interrupt if pin had an interrupt pintype previously */
if (dev->gp_pintype >= GPIO_INTERRUPT_PIN)
{
DEBUGASSERT(dev->gp_ops->go_enable != NULL);
ret = dev->gp_ops->go_enable(dev, false);
if (ret < 0)
{
break;
}
}
/* Change pintype */
DEBUGASSERT(dev->gp_ops->go_setpintype != NULL);
ret = dev->gp_ops->go_setpintype(dev, pintype);
if (ret < 0)
{
break;
}
/* Additional DEBUGASSERTs to make sure the right operations are
* available after the pintype has been changed.
*/
DEBUGASSERT(dev->gp_pintype == pintype);
DEBUGASSERT(dev->gp_ops != NULL);
DEBUGASSERT(dev->gp_ops->go_read != NULL);
DEBUGASSERT(dev->gp_ops->go_setpintype != NULL);
if (pintype >= GPIO_OUTPUT_PIN && pintype < GPIO_INTERRUPT_PIN)
{
DEBUGASSERT(dev->gp_ops->go_write != NULL);
}
else if (pintype >= GPIO_INTERRUPT_PIN)
{
DEBUGASSERT(dev->gp_ops->go_attach != NULL);
DEBUGASSERT(dev->gp_ops->go_enable != NULL);
}
}
break;
@@ -511,19 +576,13 @@ static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
* Name: gpio_pin_register
*
* Description:
* Register GPIO pin device driver.
*
* - Input pin types will be registered at /dev/gpinN
* - Output pin types will be registered at /dev/gpoutN
* - Interrupt pin types will be registered at /dev/gpintN
*
* Where N is the provided minor number in the range of 0-99.
* Register GPIO pin device driver at /dev/gpioN, where N is the provided
* minor number.
*
****************************************************************************/
int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)
{
FAR const char *fmt;
char devname[32];
int ret;
@@ -536,7 +595,6 @@ int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)
case GPIO_INPUT_PIN_PULLDOWN:
{
DEBUGASSERT(dev->gp_ops->go_read != NULL);
fmt = "/dev/gpin%u";
}
break;
@@ -544,8 +602,7 @@ int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)
case GPIO_OUTPUT_PIN_OPENDRAIN:
{
DEBUGASSERT(dev->gp_ops->go_read != NULL &&
dev->gp_ops->go_write != NULL);
fmt = "/dev/gpout%u";
dev->gp_ops->go_write != NULL);
}
break;
@@ -562,13 +619,11 @@ int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)
{
return ret;
}
fmt = "/dev/gpint%u";
}
break;
}
snprintf(devname, 16, fmt, (unsigned int)minor);
snprintf(devname, sizeof(devname), "/dev/gpio%u", (unsigned int)minor);
gpioinfo("Registering %s\n", devname);
return register_driver(devname, &g_gpio_drvrops, 0666, dev);
@@ -578,50 +633,19 @@ int gpio_pin_register(FAR struct gpio_dev_s *dev, int minor)
* Name: gpio_pin_unregister
*
* Description:
* Unregister GPIO pin device driver.
*
* - Input pin types will be registered at /dev/gpinN
* - Output pin types will be registered at /dev/gpoutN
* - Interrupt pin types will be registered at /dev/gpintN
*
* Where N is the provided minor number in the range of 0-99.
*
* Unregister GPIO pin device driver at /dev/gpioN, where N is the provided
* minor number.
*
****************************************************************************/
void gpio_pin_unregister(FAR struct gpio_dev_s *dev, int minor)
int gpio_pin_unregister(FAR struct gpio_dev_s *dev, int minor)
{
FAR const char *fmt;
char devname[16];
char devname[32];
switch (dev->gp_pintype)
{
case GPIO_INPUT_PIN:
case GPIO_INPUT_PIN_PULLUP:
case GPIO_INPUT_PIN_PULLDOWN:
{
fmt = "/dev/gpin%u";
}
break;
case GPIO_OUTPUT_PIN:
case GPIO_OUTPUT_PIN_OPENDRAIN:
{
fmt = "/dev/gpout%u";
}
break;
default:
{
fmt = "/dev/gpint%u";
}
break;
}
snprintf(devname, sizeof(devname), fmt, (unsigned int)minor);
snprintf(devname, sizeof(devname), "/dev/gpio%u", (unsigned int)minor);
gpioinfo("Unregistering %s\n", devname);
unregister_driver(devname);
return unregister_driver(devname);
}
#endif /* CONFIG_DEV_GPIO */