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authorStephen Warren <swarren@nvidia.com>2012-03-02 13:05:47 -0700
committerLinus Walleij <linus.walleij@linaro.org>2012-03-05 11:22:59 +0100
commit6e5e959dde0d92d177f035652aeaa77f9330c9c6 (patch)
treec2d874df6a1c591b558a17591a1c8fbc2ba7a1e1 /include/linux/pinctrl
parent0e3db173e2b9fd3b82246516e72c17763eb5f98d (diff)
downloadop-kernel-dev-6e5e959dde0d92d177f035652aeaa77f9330c9c6.zip
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pinctrl: API changes to support multiple states per device
The API model is changed from: p = pinctrl_get(dev, "state1"); pinctrl_enable(p); ... pinctrl_disable(p); pinctrl_put(p); p = pinctrl_get(dev, "state2"); pinctrl_enable(p); ... pinctrl_disable(p); pinctrl_put(p); to this: p = pinctrl_get(dev); s1 = pinctrl_lookup_state(p, "state1"); s2 = pinctrl_lookup_state(p, "state2"); pinctrl_select_state(p, s1); ... pinctrl_select_state(p, s2); ... pinctrl_put(p); This allows devices to directly transition between states without disabling the pin controller programming and put()/get()ing the configuration data each time. This model will also better suit pinconf programming, which doesn't have a concept of "disable". The special-case hogging feature of pin controllers is re-written to use the regular APIs instead of special-case code. Hence, the pinmux-hogs debugfs file is removed; see the top-level pinctrl-handles files for equivalent data. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/pinctrl')
-rw-r--r--include/linux/pinctrl/consumer.h55
-rw-r--r--include/linux/pinctrl/machine.h11
2 files changed, 53 insertions, 13 deletions
diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h
index 3086594..9ad5896 100644
--- a/include/linux/pinctrl/consumer.h
+++ b/include/linux/pinctrl/consumer.h
@@ -12,12 +12,14 @@
#ifndef __LINUX_PINCTRL_CONSUMER_H
#define __LINUX_PINCTRL_CONSUMER_H
+#include <linux/err.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include "pinctrl.h"
/* This struct is private to the core and should be regarded as a cookie */
struct pinctrl;
+struct pinctrl_state;
#ifdef CONFIG_PINCTRL
@@ -26,10 +28,13 @@ extern int pinctrl_request_gpio(unsigned gpio);
extern void pinctrl_free_gpio(unsigned gpio);
extern int pinctrl_gpio_direction_input(unsigned gpio);
extern int pinctrl_gpio_direction_output(unsigned gpio);
-extern struct pinctrl * __must_check pinctrl_get(struct device *dev, const char *name);
+
+extern struct pinctrl * __must_check pinctrl_get(struct device *dev);
extern void pinctrl_put(struct pinctrl *p);
-extern int pinctrl_enable(struct pinctrl *p);
-extern void pinctrl_disable(struct pinctrl *p);
+extern struct pinctrl_state * __must_check pinctrl_lookup_state(
+ struct pinctrl *p,
+ const char *name);
+extern int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *s);
#else /* !CONFIG_PINCTRL */
@@ -52,7 +57,7 @@ static inline int pinctrl_gpio_direction_output(unsigned gpio)
return 0;
}
-static inline struct pinctrl * __must_check pinctrl_get(struct device *dev, const char *name)
+static inline struct pinctrl * __must_check pinctrl_get(struct device *dev)
{
return NULL;
}
@@ -61,17 +66,53 @@ static inline void pinctrl_put(struct pinctrl *p)
{
}
-static inline int pinctrl_enable(struct pinctrl *p)
+static inline struct pinctrl_state * __must_check pinctrl_lookup_state(
+ struct pinctrl *p,
+ const char *name)
{
- return 0;
+ return NULL;
}
-static inline void pinctrl_disable(struct pinctrl *p)
+static inline int pinctrl_select_state(struct pinctrl *p,
+ struct pinctrl_state *s)
{
+ return 0;
}
#endif /* CONFIG_PINCTRL */
+static inline struct pinctrl * __must_check pinctrl_get_select(
+ struct device *dev, const char *name)
+{
+ struct pinctrl *p;
+ struct pinctrl_state *s;
+ int ret;
+
+ p = pinctrl_get(dev);
+ if (IS_ERR(p))
+ return p;
+
+ s = pinctrl_lookup_state(p, name);
+ if (IS_ERR(s)) {
+ pinctrl_put(p);
+ return ERR_PTR(PTR_ERR(s));
+ }
+
+ ret = pinctrl_select_state(p, s);
+ if (ret < 0) {
+ pinctrl_put(p);
+ return ERR_PTR(ret);
+ }
+
+ return p;
+}
+
+static inline struct pinctrl * __must_check pinctrl_get_select_default(
+ struct device *dev)
+{
+ return pinctrl_get_select(dev, PINCTRL_STATE_DEFAULT);
+}
+
#ifdef CONFIG_PINCONF
extern int pin_config_get(const char *dev_name, const char *name,
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
index 20e9735..05d25c8 100644
--- a/include/linux/pinctrl/machine.h
+++ b/include/linux/pinctrl/machine.h
@@ -21,23 +21,22 @@
* same name as the pin controllers own dev_name(), the map entry will be
* hogged by the driver itself upon registration
* @name: the name of this specific map entry for the particular machine.
- * This is the second parameter passed to pinmux_get() when you want
- * to have several mappings to the same device
+ * This is the parameter passed to pinmux_lookup_state()
* @ctrl_dev_name: the name of the device controlling this specific mapping,
* the name must be the same as in your struct device*
- * @function: a function in the driver to use for this mapping, the driver
- * will lookup the function referenced by this ID on the specified
- * pin control device
* @group: sometimes a function can map to different pin groups, so this
* selects a certain specific pin group to activate for the function, if
* left as NULL, the first applicable group will be used
+ * @function: a function in the driver to use for this mapping, the driver
+ * will lookup the function referenced by this ID on the specified
+ * pin control device
*/
struct pinctrl_map {
const char *dev_name;
const char *name;
const char *ctrl_dev_name;
- const char *function;
const char *group;
+ const char *function;
};
/*
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