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usb: typec: intel_pmc_mux: Expose IOM port status to debugfs

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IOM status has a crucial role during debugging to check the
current state of the type-C port.
There are ways to fetch the status, but all those require the
IOM port status offset, which could change with platform.

Make a debugfs directory for intel_pmc_mux and expose the status
under it per port basis.

Signed-off-by: Rajat Khandelwal <rajat.khandelwal@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Message-ID: <20230531105050.638250-1-rajat.khandelwal@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rajat Khandelwal 2023-05-31 16:20:50 +05:30 committed by Greg Kroah-Hartman
parent d5e234ff08
commit 0a453dc9f2
1 changed files with 51 additions and 1 deletions
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52
drivers/usb/typec/mux/intel_pmc_mux.c
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@ -15,6 +15,8 @@
#include <linux/usb/typec_mux.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_tbt.h>
#include <linux/debugfs.h>
#include <linux/usb.h>
#include <asm/intel_scu_ipc.h>
@ -143,8 +145,12 @@ struct pmc_usb {
struct acpi_device *iom_adev;
void __iomem *iom_base;
u32 iom_port_status_offset;
struct dentry *dentry;
};
static struct dentry *pmc_mux_debugfs_root;
static void update_port_status(struct pmc_usb_port *port)
{
u8 port_num;
@ -639,6 +645,29 @@ static int pmc_usb_probe_iom(struct pmc_usb *pmc)
return 0;
}
static int port_iom_status_show(struct seq_file *s, void *unused)
{
struct pmc_usb_port *port = s->private;
update_port_status(port);
seq_printf(s, "0x%08x\n", port->iom_status);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(port_iom_status);
static void pmc_mux_port_debugfs_init(struct pmc_usb_port *port)
{
struct dentry *debugfs_dir;
char name[6];
snprintf(name, sizeof(name), "port%d", port->usb3_port - 1);
debugfs_dir = debugfs_create_dir(name, port->pmc->dentry);
debugfs_create_file("iom_status", 0400, debugfs_dir, port,
&port_iom_status_fops);
}
static int pmc_usb_probe(struct platform_device *pdev)
{
struct fwnode_handle *fwnode = NULL;
@ -674,6 +703,8 @@ static int pmc_usb_probe(struct platform_device *pdev)
if (ret)
return ret;
pmc->dentry = debugfs_create_dir(dev_name(pmc->dev), pmc_mux_debugfs_root);
/*
* For every physical USB connector (USB2 and USB3 combo) there is a
* child ACPI device node under the PMC mux ACPI device object.
@ -688,6 +719,8 @@ static int pmc_usb_probe(struct platform_device *pdev)
fwnode_handle_put(fwnode);
goto err_remove_ports;
}
pmc_mux_port_debugfs_init(&pmc->port[i]);
}
platform_set_drvdata(pdev, pmc);
@ -703,6 +736,8 @@ err_remove_ports:
acpi_dev_put(pmc->iom_adev);
debugfs_remove(pmc->dentry);
return ret;
}
@ -718,6 +753,8 @@ static void pmc_usb_remove(struct platform_device *pdev)
}
acpi_dev_put(pmc->iom_adev);
debugfs_remove(pmc->dentry);
}
static const struct acpi_device_id pmc_usb_acpi_ids[] = {
@ -735,7 +772,20 @@ static struct platform_driver pmc_usb_driver = {
.remove_new = pmc_usb_remove,
};
module_platform_driver(pmc_usb_driver);
static int __init pmc_usb_init(void)
{
pmc_mux_debugfs_root = debugfs_create_dir("intel_pmc_mux", usb_debug_root);
return platform_driver_register(&pmc_usb_driver);
}
module_init(pmc_usb_init);
static void __exit pmc_usb_exit(void)
{
platform_driver_unregister(&pmc_usb_driver);
debugfs_remove(pmc_mux_debugfs_root);
}
module_exit(pmc_usb_exit);
MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
MODULE_LICENSE("GPL v2");