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static struct scmi_protocol_handle *ph; @@ -44,10 +48,38 @@ static int scmi_imx_misc_ctrl_notifier(struct notifier_block *nb, return 0; } +static int syslog_show(struct seq_file *file, void *priv) +{ + /* 4KB is large enough for syslog */ + void *syslog __free(kfree) = kmalloc(SZ_4K, GFP_KERNEL); + /* syslog API use num words, not num bytes */ + u16 size = SZ_4K / 4; + int ret; + + if (!ph) + return -ENODEV; + + ret = imx_misc_ctrl_ops->misc_syslog(ph, &size, syslog); + if (ret) + return ret; + + seq_hex_dump(file, " ", DUMP_PREFIX_NONE, 16, sizeof(u32), syslog, size * 4, false); + seq_putc(file, '\n'); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(syslog); + +static void scmi_imx_misc_put(void *p) +{ + debugfs_remove((struct dentry *)p); +} + static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev) { const struct scmi_handle *handle = sdev->handle; struct device_node *np = sdev->dev.of_node; + struct dentry *scmi_imx_dentry; u32 src_id, flags; int ret, i, num; @@ -98,7 +130,10 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev) } } - return 0; + scmi_imx_dentry = debugfs_create_dir("scmi_imx", NULL); + debugfs_create_file("syslog", 0444, scmi_imx_dentry, &sdev->dev, &syslog_fops); + + return devm_add_action_or_reset(&sdev->dev, scmi_imx_misc_put, scmi_imx_dentry); } static const struct scmi_device_id scmi_id_table[] = { -- 2.37.1