Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / base / pinctrl.c

diff --git a/kernel/drivers/base/pinctrl.c b/kernel/drivers/base/pinctrl.c
new file mode 100644 (file)
index 0000000..5fb74b4
--- /dev/null
+++ b/kernel/drivers/base/pinctrl.c
@@ -0,0 +1,88 @@
+/*
+ * 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;
+       }
+
+#ifdef CONFIG_PM
+       /*
+        * If power management is enabled, we also look for the optional
+        * sleep and idle pin states, with semantics as defined in
+        * <linux/pinctrl/pinctrl-state.h>
+        */
+       dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
+                                       PINCTRL_STATE_SLEEP);
+       if (IS_ERR(dev->pins->sleep_state))
+               /* Not supplying this state is perfectly legal */
+               dev_dbg(dev, "no sleep pinctrl state\n");
+
+       dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
+                                       PINCTRL_STATE_IDLE);
+       if (IS_ERR(dev->pins->idle_state))
+               /* Not supplying this state is perfectly legal */
+               dev_dbg(dev, "no idle pinctrl state\n");
+#endif
+
+       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;
+}