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authorAndres Salomon <dilinger@queued.net>2012-07-12 20:45:14 -0700
committerAndres Salomon <dilinger@queued.net>2012-07-31 23:27:31 -0400
commit6cca83d498bda0999302079bd59786370590c5c2 (patch)
tree2827895b5552696013d6809c3313b02578673ef3 /drivers/platform/olpc
parent85f90cf6ca569b19cee212844b543a7355b77163 (diff)
downloadlinux-6cca83d498bda0999302079bd59786370590c5c2.tar.gz
Platform: OLPC: move debugfs support from x86 EC driver
There's nothing about the debugfs interface for the EC driver that is architecture-specific, so move it into the arch-independent driver. The code is mostly unchanged with the exception of renamed variables, coding style changes, and API updates. Signed-off-by: Andres Salomon <dilinger@queued.net> Acked-by: Paul Fox <pgf@laptop.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/platform/olpc')
-rw-r--r--drivers/platform/olpc/olpc-ec.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index a3d32c2eeb1..1a15a79fff0 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -6,6 +6,7 @@
* Licensed under the GPL v2 or later.
*/
#include <linux/completion.h>
+#include <linux/debugfs.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
@@ -31,6 +32,8 @@ struct ec_cmd_desc {
struct olpc_ec_priv {
struct olpc_ec_driver *drv;
+ struct dentry *dbgfs_dir;
+
/*
* Running an EC command while suspending means we don't always finish
* the command before the machine suspends. This means that the EC
@@ -144,6 +147,114 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
}
EXPORT_SYMBOL_GPL(olpc_ec_cmd);
+#ifdef CONFIG_DEBUG_FS
+
+/*
+ * debugfs support for "generic commands", to allow sending
+ * arbitrary EC commands from userspace.
+ */
+
+#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
+#define EC_MAX_CMD_REPLY (8)
+
+static DEFINE_MUTEX(ec_dbgfs_lock);
+static unsigned char ec_dbgfs_resp[EC_MAX_CMD_REPLY];
+static unsigned int ec_dbgfs_resp_bytes;
+
+static ssize_t ec_dbgfs_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_dbgfs_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_dbgfs_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_dbgfs_resp_bytes > EC_MAX_CMD_REPLY) {
+ /* reset to prevent overflow on read */
+ ec_dbgfs_resp_bytes = 0;
+
+ pr_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];
+
+ pr_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_dbgfs_resp_bytes);
+
+ olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
+ ec_cmd_bytes, ec_dbgfs_resp, ec_dbgfs_resp_bytes);
+
+ pr_debug("olpc-ec: response %02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
+ ec_dbgfs_resp[0], ec_dbgfs_resp[1], ec_dbgfs_resp[2],
+ ec_dbgfs_resp[3], ec_dbgfs_resp[4], ec_dbgfs_resp[5],
+ ec_dbgfs_resp[6], ec_dbgfs_resp[7],
+ ec_dbgfs_resp_bytes);
+
+out:
+ mutex_unlock(&ec_dbgfs_lock);
+ return size;
+}
+
+static ssize_t ec_dbgfs_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_dbgfs_lock);
+ rp = respbuf;
+ rp += sprintf(rp, "%02x", ec_dbgfs_resp[0]);
+ for (i = 1; i < ec_dbgfs_resp_bytes; i++)
+ rp += sprintf(rp, ", %02x", ec_dbgfs_resp[i]);
+ mutex_unlock(&ec_dbgfs_lock);
+ rp += sprintf(rp, "\n");
+
+ r = rp - respbuf;
+ return simple_read_from_buffer(buf, size, ppos, respbuf, r);
+}
+
+static const struct file_operations ec_dbgfs_ops = {
+ .write = ec_dbgfs_cmd_write,
+ .read = ec_dbgfs_cmd_read,
+};
+
+static struct dentry *olpc_ec_setup_debugfs(void)
+{
+ struct dentry *dbgfs_dir;
+
+ dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);
+ if (IS_ERR_OR_NULL(dbgfs_dir))
+ return NULL;
+
+ debugfs_create_file("cmd", 0600, dbgfs_dir, NULL, &ec_dbgfs_ops);
+
+ return dbgfs_dir;
+}
+
+#else
+
+static struct dentry *olpc_ec_setup_debugfs(void)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_DEBUG_FS */
+
static int olpc_ec_probe(struct platform_device *pdev)
{
struct olpc_ec_priv *ec;
@@ -160,6 +271,12 @@ static int olpc_ec_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ec);
err = ec_driver->probe ? ec_driver->probe(pdev) : 0;
+ if (err) {
+ ec_priv = NULL;
+ kfree(ec);
+ } else {
+ ec->dbgfs_dir = olpc_ec_setup_debugfs();
+ }
return err;
}