1 files changed, 69 insertions, 0 deletions

diff --git a/drivers/base/pinctrl.c b/drivers/base/pinctrl.c
new file mode 100644
index 000000000000..67a274e86727
--- /dev/null
+++ b/drivers/base/pinctrl.c
@@ -0,0 +1,69 @@
+/*
+ * Driver core interface to the pinctrl subsystem.
+ *
+ * Copyright (C) 2012 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * Based on bits of regulator core, gpio core and clk core
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/device.h>
+#include <linux/pinctrl/devinfo.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/slab.h>
+
+/**
+ * pinctrl_bind_pins() - called by the device core before probe
+ * @dev: the device that is just about to probe
+ */
+int pinctrl_bind_pins(struct device *dev)
+{
+        int ret;
+
+        dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
+        if (!dev->pins)
+                return -ENOMEM;
+
+        dev->pins->p = devm_pinctrl_get(dev);
+        if (IS_ERR(dev->pins->p)) {
+                dev_dbg(dev, "no pinctrl handle\n");
+                ret = PTR_ERR(dev->pins->p);
+                goto cleanup_alloc;
+        }
+
+        dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
+                                        PINCTRL_STATE_DEFAULT);
+        if (IS_ERR(dev->pins->default_state)) {
+                dev_dbg(dev, "no default pinctrl state\n");
+                ret = 0;
+                goto cleanup_get;
+        }
+
+        ret = pinctrl_select_state(dev->pins->p, dev->pins->default_state);
+        if (ret) {
+                dev_dbg(dev, "failed to activate default pinctrl state\n");
+                goto cleanup_get;
+        }
+
+        return 0;
+
+        /*
+         * If no pinctrl handle or default state was found for this device,
+         * let's explicitly free the pin container in the device, there is
+         * no point in keeping it around.
+         */
+cleanup_get:
+        devm_pinctrl_put(dev->pins->p);
+cleanup_alloc:
+        devm_kfree(dev, dev->pins);
+        dev->pins = NULL;
+
+        /* Only return deferrals */
+        if (ret != -EPROBE_DEFER)
+                ret = 0;
+
+        return ret;
+}