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Diffstat (limited to 'drivers/extcon/extcon.c')
-rw-r--r--drivers/extcon/extcon.c163
1 files changed, 91 insertions, 72 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 2fb5f757e811..a57355fc8fea 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -3,6 +3,9 @@
*
* External connector (extcon) class driver
*
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Chanwoo Choi <cw00.choi@samsung.com>
+ *
* Copyright (C) 2012 Samsung Electronics
* Author: Donggeun Kim <dg77.kim@samsung.com>
* Author: MyungJoo Ham <myungjoo.ham@samsung.com>
@@ -32,36 +35,32 @@
#include <linux/slab.h>
#include <linux/sysfs.h>
-/*
- * extcon_cable_name suggests the standard cable names for commonly used
- * cable types.
- *
- * However, please do not use extcon_cable_name directly for extcon_dev
- * struct's supported_cable pointer unless your device really supports
- * every single port-type of the following cable names. Please choose cable
- * names that are actually used in your extcon device.
- */
-const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
+#define SUPPORTED_CABLE_MAX 32
+#define CABLE_NAME_MAX 30
+
+static const char *extcon_name[] = {
[EXTCON_USB] = "USB",
[EXTCON_USB_HOST] = "USB-Host",
[EXTCON_TA] = "TA",
[EXTCON_FAST_CHARGER] = "Fast-charger",
[EXTCON_SLOW_CHARGER] = "Slow-charger",
[EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
+ [EXTCON_LINE_IN] = "Line-in",
+ [EXTCON_LINE_OUT] = "Line-out",
+ [EXTCON_MICROPHONE] = "Microphone",
+ [EXTCON_HEADPHONE] = "Headphone",
[EXTCON_HDMI] = "HDMI",
[EXTCON_MHL] = "MHL",
[EXTCON_DVI] = "DVI",
[EXTCON_VGA] = "VGA",
- [EXTCON_DOCK] = "Dock",
- [EXTCON_LINE_IN] = "Line-in",
- [EXTCON_LINE_OUT] = "Line-out",
- [EXTCON_MIC_IN] = "Microphone",
- [EXTCON_HEADPHONE_OUT] = "Headphone",
[EXTCON_SPDIF_IN] = "SPDIF-in",
[EXTCON_SPDIF_OUT] = "SPDIF-out",
[EXTCON_VIDEO_IN] = "Video-in",
[EXTCON_VIDEO_OUT] = "Video-out",
+ [EXTCON_DOCK] = "Dock",
+ [EXTCON_JIG] = "JIG",
[EXTCON_MECHANICAL] = "Mechanical",
+ NULL,
};
static struct class *extcon_class;
@@ -101,6 +100,43 @@ static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
return 0;
}
+static int find_cable_index_by_id(struct extcon_dev *edev, const enum extcon id)
+{
+ int i;
+
+ /* Find the the index of extcon cable in edev->supported_cable */
+ for (i = 0; i < edev->max_supported; i++) {
+ if (edev->supported_cable[i] == id)
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
+{
+ enum extcon id = EXTCON_NONE;
+ int i;
+
+ if (edev->max_supported == 0)
+ return -EINVAL;
+
+ /* Find the the number of extcon cable */
+ for (i = 0; i < EXTCON_END; i++) {
+ if (!extcon_name[i])
+ continue;
+ if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
+ id = i;
+ break;
+ }
+ }
+
+ if (id == EXTCON_NONE)
+ return -EINVAL;
+
+ return find_cable_index_by_id(edev, id);
+}
+
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -118,11 +154,9 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
if (edev->max_supported == 0)
return sprintf(buf, "%u\n", edev->state);
- for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
- if (!edev->supported_cable[i])
- break;
+ for (i = 0; i < edev->max_supported; i++) {
count += sprintf(buf + count, "%s=%d\n",
- edev->supported_cable[i],
+ extcon_name[edev->supported_cable[i]],
!!(edev->state & (1 << i)));
}
@@ -171,9 +205,10 @@ static ssize_t cable_name_show(struct device *dev,
{
struct extcon_cable *cable = container_of(attr, struct extcon_cable,
attr_name);
+ int i = cable->cable_index;
return sprintf(buf, "%s\n",
- cable->edev->supported_cable[cable->cable_index]);
+ extcon_name[cable->edev->supported_cable[i]]);
}
static ssize_t cable_state_show(struct device *dev,
@@ -283,39 +318,19 @@ int extcon_set_state(struct extcon_dev *edev, u32 state)
EXPORT_SYMBOL_GPL(extcon_set_state);
/**
- * extcon_find_cable_index() - Get the cable index based on the cable name.
+ * extcon_get_cable_state_() - Get the status of a specific cable.
* @edev: the extcon device that has the cable.
- * @cable_name: cable name to be searched.
- *
- * Note that accessing a cable state based on cable_index is faster than
- * cable_name because using cable_name induces a loop with strncmp().
- * Thus, when get/set_cable_state is repeatedly used, using cable_index
- * is recommended.
+ * @id: the unique id of each external connector in extcon enumeration.
*/
-int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
+int extcon_get_cable_state_(struct extcon_dev *edev, const enum extcon id)
{
- int i;
-
- if (edev->supported_cable) {
- for (i = 0; edev->supported_cable[i]; i++) {
- if (!strncmp(edev->supported_cable[i],
- cable_name, CABLE_NAME_MAX))
- return i;
- }
- }
+ int index;
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(extcon_find_cable_index);
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
-/**
- * extcon_get_cable_state_() - Get the status of a specific cable.
- * @edev: the extcon device that has the cable.
- * @index: cable index that can be retrieved by extcon_find_cable_index().
- */
-int extcon_get_cable_state_(struct extcon_dev *edev, int index)
-{
- if (index < 0 || (edev->max_supported && edev->max_supported <= index))
+ if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
return !!(edev->state & (1 << index));
@@ -331,7 +346,7 @@ EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
*/
int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
{
- return extcon_get_cable_state_(edev, extcon_find_cable_index
+ return extcon_get_cable_state_(edev, find_cable_index_by_name
(edev, cable_name));
}
EXPORT_SYMBOL_GPL(extcon_get_cable_state);
@@ -339,17 +354,22 @@ EXPORT_SYMBOL_GPL(extcon_get_cable_state);
/**
* extcon_set_cable_state_() - Set the status of a specific cable.
* @edev: the extcon device that has the cable.
- * @index: cable index that can be retrieved by
- * extcon_find_cable_index().
- * @cable_state: the new cable status. The default semantics is
+ * @id: the unique id of each external connector
+ * in extcon enumeration.
+ * @state: the new cable status. The default semantics is
* true: attached / false: detached.
*/
-int extcon_set_cable_state_(struct extcon_dev *edev,
- int index, bool cable_state)
+int extcon_set_cable_state_(struct extcon_dev *edev, enum extcon id,
+ bool cable_state)
{
u32 state;
+ int index;
- if (index < 0 || (edev->max_supported && edev->max_supported <= index))
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
+
+ if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
state = cable_state ? (1 << index) : 0;
@@ -369,7 +389,7 @@ EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
int extcon_set_cable_state(struct extcon_dev *edev,
const char *cable_name, bool cable_state)
{
- return extcon_set_cable_state_(edev, extcon_find_cable_index
+ return extcon_set_cable_state_(edev, find_cable_index_by_name
(edev, cable_name), cable_state);
}
EXPORT_SYMBOL_GPL(extcon_set_cable_state);
@@ -455,8 +475,8 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
if (!obj->edev)
return -ENODEV;
- obj->cable_index = extcon_find_cable_index(obj->edev,
- cable_name);
+ obj->cable_index = find_cable_index_by_name(obj->edev,
+ cable_name);
if (obj->cable_index < 0)
return obj->cable_index;
@@ -479,7 +499,7 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
while ((dev = class_dev_iter_next(&iter))) {
extd = dev_get_drvdata(dev);
- if (extcon_find_cable_index(extd, cable_name) < 0)
+ if (find_cable_index_by_name(extd, cable_name) < 0)
continue;
class_dev_iter_exit(&iter);
@@ -595,7 +615,7 @@ static void dummy_sysfs_dev_release(struct device *dev)
/*
* extcon_dev_allocate() - Allocate the memory of extcon device.
- * @supported_cable: Array of supported cable names ending with NULL.
+ * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
@@ -605,7 +625,7 @@ static void dummy_sysfs_dev_release(struct device *dev)
*
* Return the pointer of extcon device if success or ERR_PTR(err) if fail
*/
-struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
+struct extcon_dev *extcon_dev_allocate(const enum extcon *supported_cable)
{
struct extcon_dev *edev;
@@ -647,7 +667,7 @@ static void devm_extcon_dev_release(struct device *dev, void *res)
/**
* devm_extcon_dev_allocate - Allocate managed extcon device
* @dev: device owning the extcon device being created
- * @supported_cable: Array of supported cable names ending with NULL.
+ * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
@@ -659,7 +679,7 @@ static void devm_extcon_dev_release(struct device *dev, void *res)
* or ERR_PTR(err) if fail
*/
struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
- const char **supported_cable)
+ const enum extcon *supported_cable)
{
struct extcon_dev **ptr, *edev;
@@ -709,17 +729,15 @@ int extcon_dev_register(struct extcon_dev *edev)
return ret;
}
- if (edev->supported_cable) {
- /* Get size of array */
- for (index = 0; edev->supported_cable[index]; index++)
- ;
- edev->max_supported = index;
- } else {
- edev->max_supported = 0;
- }
+ if (!edev->supported_cable)
+ return -EINVAL;
+
+ for (; edev->supported_cable[index] != EXTCON_NONE; index++);
+ edev->max_supported = index;
if (index > SUPPORTED_CABLE_MAX) {
- dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n");
+ dev_err(&edev->dev,
+ "exceed the maximum number of supported cables\n");
return -EINVAL;
}
@@ -1070,6 +1088,7 @@ static void __exit extcon_class_exit(void)
}
module_exit(extcon_class_exit);
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 05:11:00 +0100