Platform: OLPC: allow EC cmd to be overridden, and create a workqueue to call it

This provides a new API allows different OLPC architectures to override the
EC driver.  x86 and ARM OLPC machines use completely different EC backends.

The olpc_ec_cmd is synchronous, and waits for the workqueue to send the
command to the EC.  Multiple callers can run olpc_ec_cmd() at once, and
they will by serialized and sleep while only one executes on the EC at a time.

We don't provide an unregister function, as that doesn't make sense within
the context of OLPC machines - there's only ever 1 EC, it's critical to
functionality, and it certainly not hotpluggable.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Acked-by: Paul Fox <pgf@laptop.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 110 insertions, 2 deletions

diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
index 42026036cd3e..44e6a4fae79b 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -5,12 +5,120 @@
  *
  * Licensed under the GPL v2 or later.
  */
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
 #include <linux/module.h>
+#include <linux/list.h>
+#include <linux/olpc-ec.h>
 #include <asm/olpc.h>
 
+struct ec_cmd_desc {
+        u8 cmd;
+        u8 *inbuf, *outbuf;
+        size_t inlen, outlen;
+
+        int err;
+        struct completion finished;
+        struct list_head node;
+
+        void *priv;
+};
+
+static void olpc_ec_worker(struct work_struct *w);
+
+static DECLARE_WORK(ec_worker, olpc_ec_worker);
+static LIST_HEAD(ec_cmd_q);
+static DEFINE_SPINLOCK(ec_cmd_q_lock);
+
+static struct olpc_ec_driver *ec_driver;
+static void *ec_cb_arg;
+static DEFINE_MUTEX(ec_cb_lock);
+
+void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg)
+{
+        ec_driver = drv;
+        ec_cb_arg = arg;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_driver_register);
+
+static void olpc_ec_worker(struct work_struct *w)
+{
+        struct ec_cmd_desc *desc = NULL;
+        unsigned long flags;
+
+        /* Grab the first pending command from the queue */
+        spin_lock_irqsave(&ec_cmd_q_lock, flags);
+        if (!list_empty(&ec_cmd_q)) {
+                desc = list_first_entry(&ec_cmd_q, struct ec_cmd_desc, node);
+                list_del(&desc->node);
+        }
+        spin_unlock_irqrestore(&ec_cmd_q_lock, flags);
+
+        /* Do we actually have anything to do? */
+        if (!desc)
+                return;
+
+        /* Protect the EC hw with a mutex; only run one cmd at a time */
+        mutex_lock(&ec_cb_lock);
+        desc->err = ec_driver->ec_cmd(desc->cmd, desc->inbuf, desc->inlen,
+                        desc->outbuf, desc->outlen, ec_cb_arg);
+        mutex_unlock(&ec_cb_lock);
+
+        /* Finished, wake up olpc_ec_cmd() */
+        complete(&desc->finished);
+
+        /* Run the worker thread again in case there are more cmds pending */
+        schedule_work(&ec_worker);
+}
+
+/*
+ * Throw a cmd descripter onto the list.  We now have SMP OLPC machines, so
+ * locking is pretty critical.
+ */
+static void queue_ec_descriptor(struct ec_cmd_desc *desc)
+{
+        unsigned long flags;
+
+        INIT_LIST_HEAD(&desc->node);
+
+        spin_lock_irqsave(&ec_cmd_q_lock, flags);
+        list_add_tail(&desc->node, &ec_cmd_q);
+        spin_unlock_irqrestore(&ec_cmd_q_lock, flags);
+
+        schedule_work(&ec_worker);
+}
+
 int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
 {
-        /* Currently a stub; this will be expanded upon later. */
-        return olpc_ec_cmd_x86(cmd, inbuf, inlen, outbuf, outlen);
+        struct ec_cmd_desc desc;
+
+        /* XXX: this will be removed in later patches */
+        /* Are we using old-style callers? */
+        if (!ec_driver || !ec_driver->ec_cmd)
+                return olpc_ec_cmd_x86(cmd, inbuf, inlen, outbuf, outlen);
+
+        /* Ensure a driver and ec hook have been registered */
+        if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
+                return -ENODEV;
+
+        might_sleep();
+
+        desc.cmd = cmd;
+        desc.inbuf = inbuf;
+        desc.outbuf = outbuf;
+        desc.inlen = inlen;
+        desc.outlen = outlen;
+        desc.err = 0;
+        init_completion(&desc.finished);
+
+        queue_ec_descriptor(&desc);
+
+        /* Timeouts must be handled in the platform-specific EC hook */
+        wait_for_completion(&desc.finished);
+
+        /* The worker thread dequeues the cmd; no need to do anything here */
+        return desc.err;
 }
 EXPORT_SYMBOL_GPL(olpc_ec_cmd);