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Subject[PATCH 06/18] MMC: OMAP: Add back cover switch support
From: Juha Yrjola <juha.yrjola@solidboot.com>

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>
---
drivers/mmc/host/omap.c | 87 +++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 6b4f040..fc46a70 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);
-- 1.5.3.GIT


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