/**
* omap_hsi_prepare_suspend - Prepare HSI for suspend mode
*
* @hsi_port - reference to the HSI port. Range [1, 2]
* @dev_may_wakeup - value of sysfs flag indicating device wakeup capability
*
* Return value :* 0 if CAWAKE padconf has been configured properly
* * -ENODEV if CAWAKE is not muxed on padconf.
*
*/
int omap_hsi_prepare_suspend(int hsi_port, bool dev_may_wakeup)
{
int ret;
if (dev_may_wakeup)
ret = omap_hsi_wakeup_enable(hsi_port);
else
ret = omap_hsi_wakeup_disable(hsi_port);
return ret;
}
/**
* omap_hsi_prepare_suspend - Prepare HSI for suspend mode (OFF)
*
* Return value : -ENODEV if HSI controller has not been found, else 0.
*
*/
int omap_hsi_prepare_suspend(void)
{
struct platform_device *pdev;
struct hsi_dev *hsi_ctrl;
u16 val;
pdev = hsi_get_hsi_platform_device();
hsi_ctrl = hsi_get_hsi_controller_data(pdev);
if (!hsi_ctrl)
return -ENODEV;
/* If HSI is enabled, CAWAKE IO wakeup has been disabled and */
/* we don't want to re-enable it here. HSI interrupt shall be */
/* generated normally because HSI HW is ON. */
if (hsi_ctrl->clock_enabled) {
dev_info(hsi_ctrl->dev, "Platform Suspend while HSI active\n");
return 0;
}
/* Check for IO pad wakeup */
val = omap_mux_read_signal(OMAP_HSI_PADCONF_CAWAKE_PIN);
if (val == -ENODEV)
return -ENODEV;
/* HSI can only wakeup OMAP if CAWAKE is muxed */
if ((val & OMAP_MUX_MODE_MASK) != OMAP_HSI_PADCONF_CAWAKE_MODE)
return 0;
if (device_may_wakeup(&pdev->dev))
omap_hsi_wakeup_enable(hsi_ctrl, 0);
else
omap_hsi_wakeup_disable(hsi_ctrl, 0);
return 0;
}
