diff options
Diffstat (limited to 'drivers/usb/typec/ucsi/debugfs.c')
-rw-r--r-- | drivers/usb/typec/ucsi/debugfs.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/usb/typec/ucsi/debugfs.c b/drivers/usb/typec/ucsi/debugfs.c new file mode 100644 index 0000000000..f67733cecf --- /dev/null +++ b/drivers/usb/typec/ucsi/debugfs.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UCSI debugfs interface + * + * Copyright (C) 2023 Intel Corporation + * + * Authors: Rajaram Regupathy <rajaram.regupathy@intel.com> + * Gopal Saranya <saranya.gopal@intel.com> + */ +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/usb.h> + +#include <asm/errno.h> + +#include "ucsi.h" + +static struct dentry *ucsi_debugfs_root; + +static int ucsi_cmd(void *data, u64 val) +{ + struct ucsi *ucsi = data; + int ret; + + memset(&ucsi->debugfs->response, 0, sizeof(ucsi->debugfs->response)); + ucsi->debugfs->status = 0; + + switch (UCSI_COMMAND(val)) { + case UCSI_SET_UOM: + case UCSI_SET_UOR: + case UCSI_SET_PDR: + case UCSI_CONNECTOR_RESET: + ret = ucsi_send_command(ucsi, val, NULL, 0); + break; + case UCSI_GET_CAPABILITY: + case UCSI_GET_CONNECTOR_CAPABILITY: + case UCSI_GET_ALTERNATE_MODES: + case UCSI_GET_CURRENT_CAM: + case UCSI_GET_PDOS: + case UCSI_GET_CABLE_PROPERTY: + case UCSI_GET_CONNECTOR_STATUS: + ret = ucsi_send_command(ucsi, val, + &ucsi->debugfs->response, + sizeof(ucsi->debugfs->response)); + break; + default: + ret = -EOPNOTSUPP; + } + + if (ret < 0) { + ucsi->debugfs->status = ret; + return ret; + } + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(ucsi_cmd_fops, NULL, ucsi_cmd, "0x%llx\n"); + +static int ucsi_resp_show(struct seq_file *s, void *not_used) +{ + struct ucsi *ucsi = s->private; + + if (ucsi->debugfs->status) + return ucsi->debugfs->status; + + seq_printf(s, "0x%016llx%016llx\n", ucsi->debugfs->response.high, + ucsi->debugfs->response.low); + return 0; +} +DEFINE_SHOW_ATTRIBUTE(ucsi_resp); + +void ucsi_debugfs_register(struct ucsi *ucsi) +{ + ucsi->debugfs = kzalloc(sizeof(*ucsi->debugfs), GFP_KERNEL); + if (!ucsi->debugfs) + return; + + ucsi->debugfs->dentry = debugfs_create_dir(dev_name(ucsi->dev), ucsi_debugfs_root); + debugfs_create_file("command", 0200, ucsi->debugfs->dentry, ucsi, &ucsi_cmd_fops); + debugfs_create_file("response", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_resp_fops); +} + +void ucsi_debugfs_unregister(struct ucsi *ucsi) +{ + if (IS_ERR_OR_NULL(ucsi) || !ucsi->debugfs) + return; + + debugfs_remove_recursive(ucsi->debugfs->dentry); + kfree(ucsi->debugfs); +} + +void ucsi_debugfs_init(void) +{ + ucsi_debugfs_root = debugfs_create_dir("ucsi", usb_debug_root); +} + +void ucsi_debugfs_exit(void) +{ + debugfs_remove(ucsi_debugfs_root); +} |