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The extcon has two type of extcon devices as following.
- 'extcon provider deivce' adds new extcon device and detect the
state/properties of external connector. Also, it notifies the
state/properties to the extcon consumer device.
- 'extcon consumer device' gets the change state/properties
from extcon provider device.
Prior to that, include/linux/extcon.h contains all exported API for
both provider and consumer device driver. To clarify the meaning of
header file and to remove the wrong use-case on consumer device,
this patch separates into extcon.h and extcon-provider.h.
[Description for include/linux/{extcon.h|extcon-provider.h}]
- extcon.h includes the extcon API and data structure for extcon consumer
device driver. This header file contains the following APIs:
: Register/unregister the notifier to catch the change of extcon device
: Get the extcon device instance
: Get the extcon device name
: Get the state of each external connector
: Get the property value of each external connector
: Get the property capability of each external connector
- extcon-provider.h includes the extcon API and data structure for extcon
provider device driver. This header file contains the following APIs:
: Include 'include/linux/extcon.h'
: Allocate the memory for extcon device instance
: Register/unregister extcon device
: Set the state of each external connector
: Set the property value of each external connector
: Set the property capability of each external connector
Signed-off-by: Chanwoo Choi <[email protected]>
Acked-by: Sebastian Reichel <[email protected]>
Acked-by: Chen-Yu Tsai <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Acked-by: Lee Jones <[email protected]>
Acked-by: Felipe Balbi <[email protected]>
Acked-by: Yoshihiro Shimoda <[email protected]>
Acked-by: Kishon Vijay Abraham I <[email protected]>
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We must check for ID/VBUS changes during resume irrespective
of whether our device wakeup is enabled or not.
Without this we seem to be missing ID/VBUS events after
system suspend/resume.
Signed-off-by: Roger Quadros <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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Whether the USB port as a wakeup source should be determined by user,
but not enabled by default.
Signed-off-by: Peter Chen <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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The commit 942c7924a51e introduced a check for ACPI handle for the
device that never appears on any ACPI-enabled platform so far. It seems
a confusion with extcon-intel-int3496 which does support ACPI-enabled
platforms.
Revert commit 942c7924a51e to avoid any confusion in the future.
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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At some systems, the pinctrl setting will be lost or needs to
set as "sleep" state to save power consumption. So, we need to
configure pinctrl as "sleep" state when system enters suspend,
and as "default" state after system resumes. In this way, the
pinctrl value can be recovered as "default" state after resuming.
Signed-off-by: Peter Chen <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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Driver can now work with both ID and VBUS pins or either one of
them.
There can be the following 3 cases
1) Both ID and VBUS GPIOs are available:
ID = LOW -> USB_HOST active, USB inactive
ID = HIGH -> USB_HOST inactive, USB state is same as VBUS.
2) Only ID GPIO is available:
ID = LOW -> USB_HOST active, USB inactive
ID = HIGH -> USB_HOST inactive, USB active
3) Only VBUS GPIO is available:
VBUS = LOW -> USB_HOST inactive, USB inactive
VBUS = HIGH -> USB_HOST inactive, USB active
Signed-off-by: Roger Quadros <[email protected]>
Reviewed-by: Peter Chen <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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This patch alters the renamed extcon API to set the state of the external
connectors instead of deprecated extcon_set_cable_state_().
Because the patch[1] modifies the function name to maintain the function
naming pattern.
- extcon_set_cable_state_() -> extcon_set_state_sync()
- extcon_get_cable_state_() -> extcon_get_state()
[1] https://lkml.org/lkml/2016/8/4/729
- extcon: Rename the extcon_set/get_state() to maintain the function naming pattern
Signed-off-by: Chanwoo Choi <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Acked-by: Roger Quadros <[email protected]>
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GPIO resource could be retrieved through APCI as well.
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Felipe Balbi <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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This is needed to handle the GPIO connected USB ID pin found on
Intel Baytrail devices.
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Felipe Balbi <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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Pin state might have changed during suspend/resume while
our interrupts were disabled and if device doesn't support wakeup.
Scan for change during resume for such case.
Signed-off-by: Roger Quadros <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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Switch to use PM wakeirq APIs which automates wakeup IRQs
enabling/disabling and so allows to make code simpler.
Signed-off-by: Grygorii Strashko <[email protected]>
Acked-by: Tony Lindgren <[email protected]>
Acked-by: Roger Quadros <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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Some palmas based chip variants do not have OTG based ID logic.
For these variants we rely on GPIO based USB ID detection.
These chips do have VBUS comparator for VBUS detection so we
continue to use the old way of detecting VBUS.
Signed-off-by: Roger Quadros <[email protected]>
Acked-by: Chanwoo Choi <[email protected]>
Acked-by: Lee Jones <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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'enum extcon' type
This patch just redefine the unique id of supported external connectors without
'enum extcon' type. Because unique id would be used on devictree file(*.dts) to
indicate the specific external connectors like key number of input framework.
So, I have the plan to move this definitions to following header file which
includes the unique id of supported external connectors.
- include/dt-bindings/extcon/extcon.h
Fixes: 2a9de9c0f08d ("extcon: Use the unique id for external connector instead of string")
Signed-off-by: Chanwoo Choi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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This patch uses the unique id to identify the type of external connector instead
of string name. The string name have the many potential issues. So, this patch
defines the 'extcon' enumeration which includes all supported external connector
on EXTCON subsystem. If new external connector is necessary, the unique id of
new connector have to be added in 'extcon' enumeration. There are current
supported external connector in 'enum extcon' as following:
enum extcon {
EXTCON_NONE = 0x0,
/* USB external connector */
EXTCON_USB = 0x1,
EXTCON_USB_HOST = 0x2,
/* Charger external connector */
EXTCON_TA = 0x10,
EXTCON_FAST_CHARGER = 0x11,
EXTCON_SLOW_CHARGER = 0x12,
EXTCON_CHARGE_DOWNSTREAM = 0x13,
/* Audio and video external connector */
EXTCON_LINE_IN = 0x20,
EXTCON_LINE_OUT = 0x21,
EXTCON_MICROPHONE = 0x22,
EXTCON_HEADPHONE = 0x23,
EXTCON_HDMI = 0x30,
EXTCON_MHL = 0x31,
EXTCON_DVI = 0x32,
EXTCON_VGA = 0x33,
EXTCON_SPDIF_IN = 0x34,
EXTCON_SPDIF_OUT = 0x35,
EXTCON_VIDEO_IN = 0x36,
EXTCON_VIDEO_OUT = 0x37,
/* Miscellaneous external connector */
EXTCON_DOCK = 0x50,
EXTCON_JIG = 0x51,
EXTCON_MECHANICAL = 0x52,
EXTCON_END,
};
For example in extcon-arizona.c:
To use unique id removes the potential issue about handling
the inconsistent name of external connector with string.
- Previously, use the string to register the type of arizona jack connector
static const char *arizona_cable[] = {
"Mechanical",
"Microphone",
"Headphone",
"Line-out",
};
- Newly, use the unique id to register the type of arizona jack connector
static const enum extcon arizona_cable[] = {
EXTCON_MECHANICAL,
EXTCON_MICROPHONE,
EXTCON_HEADPHONE,
EXTCON_LINE_OUT,
EXTCON_NONE,
};
And this patch modify the prototype of extcon_{get|set}_cable_state_() which
uses the 'enum extcon id' instead of 'cable_index'. Because although one more
extcon drivers support USB cable, each extcon driver might has the differnt
'cable_index' for USB cable. All extcon drivers can use the unique id number
for same external connector with modified extcon_{get|set}_cable_state_().
- Previously, use 'cable_index' on these functions:
extcon_get_cable_state_(struct extcon_dev*, int cable_index)
extcon_set_cable_state_(struct extcon_dev*, int cable_index, bool state)
-Newly, use 'enum extcon id' on these functions:
extcon_get_cable_state_(struct extcon_dev*, enum extcon id)
extcon_set_cable_state_(struct extcon_dev*, enum extcon id, bool state)
Cc: Arnd Bergmann <[email protected]>
Cc: Felipe Balbi <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
Acked-by: Roger Quadros <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Acked-by: Ramakrishna Pallala <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
[arnd: Report the build break about drivers/usb/phy/phy-tahvo.c after using the
unique id for external connector insteadf of string]
Reported-by: Arnd Bergmann <[email protected]>
[dan.carpenter: Report the build warning of extcon_{set|get}_cable_state_()]
Reported-by: Dan Carpenter <[email protected]>
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Since 39b2bbe3d715 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.
Without this patch there is no call to gpiod_direction_input but the
gpio is used for irq reporting and for that the line should be in input
mode.
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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The GPIO subsystem provides dummy GPIO consumer functions if GPIOLIB is
not enabled. Hence drivers that depend on GPIOLIB, but use GPIO consumer
functionality only, can still be compiled if GPIOLIB is not enabled.
Relax the dependency on GPIOLIB if COMPILE_TEST is enabled, where
appropriate.
If GPIOLIB=n and asm-generic/gpio.h is not used:
drivers/extcon/extcon-usb-gpio.c: In function ‘usb_extcon_detect_cable’:
drivers/extcon/extcon-usb-gpio.c:63: error: implicit declaration of function ‘gpiod_get_value_cansleep’
drivers/extcon/extcon-usb-gpio.c: In function ‘usb_extcon_probe’:
drivers/extcon/extcon-usb-gpio.c:116: error: implicit declaration of function ‘devm_gpiod_get’
drivers/extcon/extcon-usb-gpio.c:116: warning: assignment makes pointer from integer without a cast
drivers/extcon/extcon-usb-gpio.c:122: error: implicit declaration of function ‘gpiod_set_debounce’
drivers/extcon/extcon-usb-gpio.c:129: error: implicit declaration of function ‘gpiod_to_irq’
Add the missing #include <linux/gpio/consumer.h> to fix this.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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IRQ handler touches info->edev, so if interrupt occurs before extcon
device initialization it can cause NULL pointer dereference. Doing extcon
initialization before IRQ handler registration fixes this problem.
Signed-off-by: Robert Baldyga <[email protected]>
Acked-by: Roger Quadros <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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This patch fixes the checkpatch warning about coding style.
Signed-off-by: Chanwoo Choi <[email protected]>
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This driver observes the USB ID pin connected over a GPIO and
updates the USB cable extcon states accordingly.
The existing GPIO extcon driver is not suitable for this purpose
as it needs to be taught to understand USB cable states and it
can't handle more than one cable per instance.
For the USB case we need to handle 2 cable states.
1) USB (attach/detach)
2) USB-HOST (attach/detach)
This driver can be easily updated in the future to handle VBUS
events in case it happens to be available on GPIO for any platform.
Signed-off-by: Roger Quadros <[email protected]>
Reviewed-by: Felipe Balbi <[email protected]>
Acked-by: Felipe Balbi <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
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