From 0a453dc9f260281e3a063e07b526a7e494e496fe Mon Sep 17 00:00:00 2001 From: Rajat Khandelwal Date: Wed, 31 May 2023 16:20:50 +0530 Subject: 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 Reviewed-by: Heikki Krogerus Message-ID: <20230531105050.638250-1-rajat.khandelwal@linux.intel.com> Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/mux/intel_pmc_mux.c | 52 ++++++++++++++++++++++++++++++++++- 1 file changed, 51 insertions(+), 1 deletion(-) (limited to 'drivers/usb') diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c index e049eadb591e..5e8edf3881c0 100644 --- a/drivers/usb/typec/mux/intel_pmc_mux.c +++ b/drivers/usb/typec/mux/intel_pmc_mux.c @@ -15,6 +15,8 @@ #include #include #include +#include +#include #include @@ -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 "); MODULE_LICENSE("GPL v2"); -- cgit v1.2.3