[PATCH v1 1/2] powerpc/ps3: Add firmware version to proc

[Geoff Levand <geoff@infradead.org>]

Add a new proc FS entry /proc/ps3/firmware-version that exports the
PS3's firmware version.

The firmware version is available through an LV1 hypercall, and we've
been printing it to the boot log, but haven't provided an easy way for
user utilities to get it.

Signed-off-by: Geoff Levand <geoff@infradead.org>
---
 arch/powerpc/platforms/ps3/setup.c | 62 ++++++++++++++++++++++++++++--
 1 file changed, 59 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/ps3/setup.c b/arch/powerpc/platforms/ps3/setup.c
index e9ae5dd03593..c3c4cbf16632 100644
--- a/arch/powerpc/platforms/ps3/setup.c
+++ b/arch/powerpc/platforms/ps3/setup.c
@@ -13,6 +13,7 @@
 #include <linux/console.h>
 #include <linux/export.h>
 #include <linux/memblock.h>
+#include <linux/proc_fs.h>
 
 #include <asm/machdep.h>
 #include <asm/firmware.h>
@@ -36,6 +37,7 @@ DEFINE_MUTEX(ps3_gpu_mutex);
 EXPORT_SYMBOL_GPL(ps3_gpu_mutex);
 
 static union ps3_firmware_version ps3_firmware_version;
+static char ps3_firmware_version_str[16];
 
 void ps3_get_firmware_version(union ps3_firmware_version *v)
 {
@@ -182,6 +184,58 @@ static int ps3_set_dabr(unsigned long dabr, unsigned long dabrx)
 	return lv1_set_dabr(dabr, dabrx) ? -1 : 0;
 }
 
+static ssize_t ps3_fw_ver_read(struct file *file, char __user *buf, size_t size,
+	loff_t *ppos)
+{
+	ssize_t bytes = simple_read_from_buffer(buf, size, ppos,
+		ps3_firmware_version_str, strlen(ps3_firmware_version_str));
+
+	pr_debug("%s:%d: %zd bytes '%s'\n", __func__, __LINE__, bytes,
+	       ps3_firmware_version_str);
+
+	if (bytes < 0) {
+		pr_err("%s:%d: failed: %zd\n", __func__, __LINE__, bytes);
+		return bytes;
+	}
+
+	buf += bytes;
+	size -= bytes;
+
+	return bytes;
+}
+
+static int __init ps3_setup_proc(void)
+{
+	static const struct proc_ops proc_ops = {
+		.proc_read = ps3_fw_ver_read,
+		.proc_lseek = default_llseek,
+	};
+	struct proc_dir_entry *entry;
+
+	entry = proc_mkdir("ps3", NULL);
+
+	if (!entry) {
+		pr_err("%s:%d: failed.\n", __func__, __LINE__);
+		return 1;
+	}
+
+	entry = proc_create_data("ps3/firmware-version", S_IFREG | 0444, NULL,
+		&proc_ops, NULL);
+
+	if (!entry) {
+		pr_err("%s:%d: failed.\n", __func__, __LINE__);
+		return 1;
+	}
+
+	proc_set_size(entry, strlen(ps3_firmware_version_str));
+
+	pr_debug("%s:%d: '%s' = %zd bytes\n", __func__, __LINE__,
+		ps3_firmware_version_str, strlen(ps3_firmware_version_str));
+
+	return 0;
+}
+core_initcall(ps3_setup_proc);
+
 static void __init ps3_setup_arch(void)
 {
 	u64 tmp;
@@ -190,9 +244,11 @@ static void __init ps3_setup_arch(void)
 
 	lv1_get_version_info(&ps3_firmware_version.raw, &tmp);
 
-	printk(KERN_INFO "PS3 firmware version %u.%u.%u\n",
-	       ps3_firmware_version.major, ps3_firmware_version.minor,
-	       ps3_firmware_version.rev);
+	snprintf(ps3_firmware_version_str, sizeof(ps3_firmware_version_str),
+		"%u.%u.%u", ps3_firmware_version.major,
+		ps3_firmware_version.minor, ps3_firmware_version.rev);
+
+	printk(KERN_INFO "PS3 firmware version %s\n", ps3_firmware_version_str);
 
 	ps3_spu_set_platform();
 
-- 
2.25.1