MMC: OMAP: Add back cover switch support

This patch adds back MMC cover switch support in a way that
supports multiple slots.

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 84 insertions, 3 deletions

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 59eac7211842..712a9608acf7 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -106,6 +106,10 @@ struct mmc_omap_slot {
         unsigned int            fclk_freq;
         unsigned                powered:1;
 
+        struct work_struct      switch_work;
+        struct timer_list       switch_timer;
+        unsigned                cover_open;
+
         struct mmc_request      *mrq;
         struct mmc_omap_host    *host;
         struct mmc_host         *mmc;
@@ -226,6 +230,25 @@ static void mmc_omap_release_slot(struct mmc_omap_slot *slot)
         spin_unlock_irqrestore(&host->slot_lock, flags);
 }
 
+static inline
+int mmc_omap_cover_is_open(struct mmc_omap_slot *slot)
+{
+        return slot->pdata->get_cover_state(mmc_dev(slot->mmc), slot->id);
+}
+
+static ssize_t
+mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr,
+                           char *buf)
+{
+        struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
+        struct mmc_omap_slot *slot = mmc_priv(mmc);
+
+        return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" :
+                       "closed");
+}
+
+static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL);
+
 static ssize_t
 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr,
                         char *buf)
@@ -544,9 +567,10 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
                         if (host->cmd) {
                                 struct mmc_omap_slot *slot =
                                         host->current_slot;
-                                dev_err(mmc_dev(host->mmc),
-                                        "command timeout, CMD %d\n",
-                                        host->cmd->opcode);
+                                if (!mmc_omap_cover_is_open(slot))
+                                        dev_err(mmc_dev(host->mmc),
+                                                "command timeout, CMD %d\n",
+                                                host->cmd->opcode);
                                 host->cmd->error = -ETIMEDOUT;
                                 end_command = 1;
                         }
@@ -592,6 +616,42 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
+void omap_mmc_notify_cover_event(struct device *dev, int slot, int is_closed)
+{
+        struct mmc_omap_host *host = dev_get_drvdata(dev);
+
+        BUG_ON(slot >= host->nr_slots);
+
+        /* Other subsystems can call in here before we're initialised. */
+        if (host->nr_slots == 0 || !host->slots[slot])
+                return;
+
+        schedule_work(&host->slots[slot]->switch_work);
+}
+
+static void mmc_omap_switch_timer(unsigned long arg)
+{
+        struct mmc_omap_slot *slot = (struct mmc_omap_slot *) arg;
+
+        schedule_work(&slot->switch_work);
+}
+
+static void mmc_omap_cover_handler(struct work_struct *work)
+{
+        struct mmc_omap_slot *slot = container_of(work, struct mmc_omap_slot,
+                                                  switch_work);
+        int cover_open;
+
+        cover_open = mmc_omap_cover_is_open(slot);
+        if (cover_open != slot->cover_open) {
+                sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch");
+                slot->cover_open = cover_open;
+                dev_info(mmc_dev(slot->mmc), "cover is now %s\n",
+                         cover_open ? "open" : "closed");
+        }
+        mmc_detect_change(slot->mmc, slot->id);
+}
+
 /* Prepare to transfer the next segment of a scatterlist */
 static void
 mmc_omap_prepare_dma(struct mmc_omap_host *host, struct mmc_data *data)
@@ -1062,8 +1122,24 @@ static int __init mmc_omap_new_slot(struct mmc_omap_host *host, int id)
                         goto err_remove_host;
         }
 
+        if (slot->pdata->get_cover_state != NULL) {
+                r = device_create_file(&mmc->class_dev,
+                                        &dev_attr_cover_switch);
+                if (r < 0)
+                        goto err_remove_slot_name;
+
+                INIT_WORK(&slot->switch_work, mmc_omap_cover_handler);
+                init_timer(&slot->switch_timer);
+                slot->switch_timer.function = mmc_omap_switch_timer;
+                slot->switch_timer.data = (unsigned long) slot;
+                schedule_work(&slot->switch_work);
+        }
+
         return 0;
 
+err_remove_slot_name:
+        if (slot->pdata->name != NULL)
+                device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
 err_remove_host:
         mmc_remove_host(mmc);
         mmc_free_host(mmc);
@@ -1076,6 +1152,11 @@ static void mmc_omap_remove_slot(struct mmc_omap_slot *slot)
 
         if (slot->pdata->name != NULL)
                 device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
+        if (slot->pdata->get_cover_state != NULL)
+                device_remove_file(&mmc->class_dev, &dev_attr_cover_switch);
+
+        del_timer_sync(&slot->switch_timer);
+        flush_scheduled_work();
 
         mmc_remove_host(mmc);
         mmc_free_host(mmc);