x86/olpc: Add debugfs interface for EC commands

Add a debugfs interface for sending commands to the OLPC
Embedded Controller (EC) and reading the responses.  The EC
provides functionality for machine identification, battery and
AC control, wakeup control, etc.

Having a debugfs interface available is useful for EC
development and debugging.

Based on code by Paul Fox (who also approves of the end result).

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Paul Fox <pgf@laptop.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andres Salomon <dilinger@queued.net>
Link: http://lkml.kernel.org/r/20120327150740.667D09D401E@zog.reactivated.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 113 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/debugfs-olpc b/Documentation/ABI/testing/debugfs-olpc
new file mode 100644
index 000000000000..bd76cc6d55f9
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-olpc
@@ -0,0 +1,16 @@
+What:           /sys/kernel/debug/olpc-ec/cmd
+Date:           Dec 2011
+KernelVersion:  3.4
+Contact:        devel@lists.laptop.org
+Description:
+
+A generic interface for executing OLPC Embedded Controller commands and
+reading their responses.
+
+To execute a command, write data with the format: CC:N A A A A
+CC is the (hex) command, N is the count of expected reply bytes, and A A A A
+are optional (hex) arguments.
+
+To read the response (if any), read from the generic node after executing
+a command. Hex reply bytes will be returned, *whether or not* they came from
+the immediately previous command.
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
index 7cce722667b8..a4bee53c2e54 100644
--- a/arch/x86/platform/olpc/olpc.c
+++ b/arch/x86/platform/olpc/olpc.c
@@ -20,6 +20,8 @@
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/syscore_ops.h>
+#include <linux/debugfs.h>
+#include <linux/mutex.h>
 
 #include <asm/geode.h>
 #include <asm/setup.h>
@@ -31,6 +33,15 @@ EXPORT_SYMBOL_GPL(olpc_platform_info);
 
 static DEFINE_SPINLOCK(ec_lock);
 
+/* debugfs interface to EC commands */
+#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
+#define EC_MAX_CMD_REPLY (8)
+
+static struct dentry *ec_debugfs_dir;
+static DEFINE_MUTEX(ec_debugfs_cmd_lock);
+static unsigned char ec_debugfs_resp[EC_MAX_CMD_REPLY];
+static unsigned int ec_debugfs_resp_bytes;
+
 /* EC event mask to be applied during suspend (defining wakeup sources). */
 static u16 ec_wakeup_mask;
 
@@ -269,6 +280,91 @@ int olpc_ec_sci_query(u16 *sci_value)
 }
 EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
 
+static ssize_t ec_debugfs_cmd_write(struct file *file, const char __user *buf,
+                                    size_t size, loff_t *ppos)
+{
+        int i, m;
+        unsigned char ec_cmd[EC_MAX_CMD_ARGS];
+        unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
+        char cmdbuf[64];
+        int ec_cmd_bytes;
+
+        mutex_lock(&ec_debugfs_cmd_lock);
+
+        size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
+
+        m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
+                   &ec_debugfs_resp_bytes,
+                   &ec_cmd_int[1], &ec_cmd_int[2], &ec_cmd_int[3],
+                   &ec_cmd_int[4], &ec_cmd_int[5]);
+        if (m < 2 || ec_debugfs_resp_bytes > EC_MAX_CMD_REPLY) {
+                /* reset to prevent overflow on read */
+                ec_debugfs_resp_bytes = 0;
+
+                printk(KERN_DEBUG "olpc-ec: bad ec cmd:  "
+                       "cmd:response-count [arg1 [arg2 ...]]\n");
+                size = -EINVAL;
+                goto out;
+        }
+
+        /* convert scanf'd ints to char */
+        ec_cmd_bytes = m - 2;
+        for (i = 0; i <= ec_cmd_bytes; i++)
+                ec_cmd[i] = ec_cmd_int[i];
+
+        printk(KERN_DEBUG "olpc-ec: debugfs cmd 0x%02x with %d args "
+               "%02x %02x %02x %02x %02x, want %d returns\n",
+               ec_cmd[0], ec_cmd_bytes, ec_cmd[1], ec_cmd[2], ec_cmd[3],
+               ec_cmd[4], ec_cmd[5], ec_debugfs_resp_bytes);
+
+        olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
+                    ec_cmd_bytes, ec_debugfs_resp, ec_debugfs_resp_bytes);
+
+        printk(KERN_DEBUG "olpc-ec: response "
+               "%02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
+               ec_debugfs_resp[0], ec_debugfs_resp[1], ec_debugfs_resp[2],
+               ec_debugfs_resp[3], ec_debugfs_resp[4], ec_debugfs_resp[5],
+               ec_debugfs_resp[6], ec_debugfs_resp[7], ec_debugfs_resp_bytes);
+
+out:
+        mutex_unlock(&ec_debugfs_cmd_lock);
+        return size;
+}
+
+static ssize_t ec_debugfs_cmd_read(struct file *file, char __user *buf,
+                                   size_t size, loff_t *ppos)
+{
+        unsigned int i, r;
+        char *rp;
+        char respbuf[64];
+
+        mutex_lock(&ec_debugfs_cmd_lock);
+        rp = respbuf;
+        rp += sprintf(rp, "%02x", ec_debugfs_resp[0]);
+        for (i = 1; i < ec_debugfs_resp_bytes; i++)
+                rp += sprintf(rp, ", %02x", ec_debugfs_resp[i]);
+        mutex_unlock(&ec_debugfs_cmd_lock);
+        rp += sprintf(rp, "\n");
+
+        r = rp - respbuf;
+        return simple_read_from_buffer(buf, size, ppos, respbuf, r);
+}
+
+static const struct file_operations ec_debugfs_genops = {
+        .write   = ec_debugfs_cmd_write,
+        .read    = ec_debugfs_cmd_read,
+};
+
+static void setup_debugfs(void)
+{
+        ec_debugfs_dir = debugfs_create_dir("olpc-ec", 0);
+        if (ec_debugfs_dir == ERR_PTR(-ENODEV))
+                return;
+
+        debugfs_create_file("cmd", 0600, ec_debugfs_dir, NULL,
+                            &ec_debugfs_genops);
+}
+
 static int olpc_ec_suspend(void)
 {
         return olpc_ec_mask_write(ec_wakeup_mask);
@@ -372,6 +468,7 @@ static int __init olpc_init(void)
         }
 
         register_syscore_ops(&olpc_syscore_ops);
+        setup_debugfs();
 
         return 0;
 }