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author | Rajat Khandelwal <rajat.khandelwal@linux.intel.com> | 2023-05-31 16:20:50 +0530 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-13 11:54:58 +0200 |
commit | 0a453dc9f260281e3a063e07b526a7e494e496fe (patch) | |
tree | e57851a7e920d758fa8575a02a529616b1352a17 /drivers/usb | |
parent | d5e234ff08a45a7a08a52173ed793b3c125ab88d (diff) | |
download | linux-0a453dc9f260281e3a063e07b526a7e494e496fe.tar.gz linux-0a453dc9f260281e3a063e07b526a7e494e496fe.tar.bz2 linux-0a453dc9f260281e3a063e07b526a7e494e496fe.zip |
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@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>
Diffstat (limited to 'drivers/usb')
-rw-r--r-- | drivers/usb/typec/mux/intel_pmc_mux.c | 52 |
1 files changed, 51 insertions, 1 deletions
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 <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"); |