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Message-Id: <20230419130345.1689915-1-rajat.khandelwal@linux.intel.com>
Date: Wed, 19 Apr 2023 18:33:45 +0530
From: Rajat Khandelwal <rajat.khandelwal@...ux.intel.com>
To: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Rajat Khandelwal <rajat.khandelwal@...ux.intel.com>
Subject: [PATCH v3] usb: typec: intel_pmc_mux: Expose IOM port status to debugfs
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@...ux.intel.com>
---
v3: Allocate the debugfs directory name for the platform device with
its ACPI dev name included
v2:
1. Remove static declaration of the debugfs root for 'intel_pmc_mux'
2. Remove explicitly defined one-liner functions
drivers/usb/typec/mux/intel_pmc_mux.c | 38 +++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
index 34e4188a40ff..2264b8dd5436 100644
--- a/drivers/usb/typec/mux/intel_pmc_mux.c
+++ b/drivers/usb/typec/mux/intel_pmc_mux.c
@@ -15,6 +15,7 @@
#include <linux/usb/typec_mux.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_tbt.h>
+#include <linux/debugfs.h>
#include <asm/intel_scu_ipc.h>
@@ -143,6 +144,10 @@ struct pmc_usb {
struct acpi_device *iom_adev;
void __iomem *iom_base;
u32 iom_port_status_offset;
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dentry;
+#endif
};
static void update_port_status(struct pmc_usb_port *port)
@@ -639,10 +644,34 @@ 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;
struct pmc_usb *pmc;
+ char name[NAME_MAX];
int i = 0;
int ret;
@@ -674,6 +703,9 @@ static int pmc_usb_probe(struct platform_device *pdev)
if (ret)
return ret;
+ snprintf(name, NAME_MAX, "intel_pmc_mux-%s", pdev->name);
+ pmc->dentry = debugfs_create_dir(name, NULL);
+
/*
* 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 +720,8 @@ 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 +737,8 @@ static int pmc_usb_probe(struct platform_device *pdev)
acpi_dev_put(pmc->iom_adev);
+ debugfs_remove(pmc->dentry);
+
return ret;
}
@@ -719,6 +755,8 @@ static int pmc_usb_remove(struct platform_device *pdev)
acpi_dev_put(pmc->iom_adev);
+ debugfs_remove(pmc->dentry);
+
return 0;
}
--
2.34.1
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