mmc: sdhci-msm: Add polling sysfs entry
Add support for polling by providing sysfs entry. It can be
enabled/disabled, by writing 1/0 respectively to the sysfs node -
sys/bus/platform/devices/msm_sdcc.<slotno>/polling. The polling
will be available only if hardware based card detection is not
supported.
Change-Id: Ic58c36665e23cb921d76c482494a168289e83b83
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 4ff8fea..23ccff2 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -264,6 +264,7 @@
u32 curr_io_level;
struct completion pwr_irq_completion;
struct sdhci_msm_bus_vote msm_bus_vote;
+ struct device_attribute polling;
u32 clk_rate; /* Keeps track of current clock rate that is set */
};
@@ -1838,6 +1839,42 @@
else
return 0;
}
+
+static ssize_t
+show_polling(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ int poll;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ poll = !!(host->mmc->caps & MMC_CAP_NEEDS_POLL);
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", poll);
+}
+
+static ssize_t
+store_polling(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+ int value;
+ unsigned long flags;
+
+ if (!kstrtou32(buf, 0, &value)) {
+ spin_lock_irqsave(&host->lock, flags);
+ if (value) {
+ host->mmc->caps |= MMC_CAP_NEEDS_POLL;
+ mmc_detect_change(host->mmc, 0);
+ } else {
+ host->mmc->caps &= ~MMC_CAP_NEEDS_POLL;
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+ return count;
+}
+
static ssize_t
show_sdhci_max_bus_bw(struct device *dev, struct device_attribute *attr,
char *buf)
@@ -2464,6 +2501,16 @@
if (ret)
goto remove_host;
+ if (!gpio_is_valid(msm_host->pdata->status_gpio)) {
+ msm_host->polling.show = show_polling;
+ msm_host->polling.store = store_polling;
+ sysfs_attr_init(&msm_host->polling.attr);
+ msm_host->polling.attr.name = "polling";
+ msm_host->polling.attr.mode = S_IRUGO | S_IWUSR;
+ ret = device_create_file(&pdev->dev, &msm_host->polling);
+ if (ret)
+ goto remove_max_bus_bw_file;
+ }
ret = pm_runtime_set_active(&pdev->dev);
if (ret)
pr_err("%s: %s: pm_runtime_set_active failed: err: %d\n",
@@ -2474,6 +2521,8 @@
/* Successful initialization */
goto out;
+remove_max_bus_bw_file:
+ device_remove_file(&pdev->dev, &msm_host->msm_bus_vote.max_bus_bw);
remove_host:
dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
@@ -2512,6 +2561,8 @@
0xffffffff);
pr_debug("%s: %s\n", dev_name(&pdev->dev), __func__);
+ if (!gpio_is_valid(msm_host->pdata->status_gpio))
+ device_remove_file(&pdev->dev, &msm_host->polling);
device_remove_file(&pdev->dev, &msm_host->msm_bus_vote.max_bus_bw);
sdhci_remove_host(host, dead);
pm_runtime_disable(&pdev->dev);