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path: root/drivers/counter/104-quad-8.c
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2022-07-14counter: 104-quad-8: Implement and utilize register structuresWilliam Breathitt Gray
Reduce magic numbers and improve code readability by implementing and utilizing named register data structures. Link: https://lore.kernel.org/r/20220707171709.36010-1-william.gray@linaro.org/ Cc: Syed Nayyar Waris <syednwaris@gmail.com> Tested-by: Fred Eckert <Frede@cmslaser.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Link: https://lore.kernel.org/r/285fdc7c03892251f50bdbf2c28c19998243a6a3.1657813472.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-07-14counter: 104-quad-8: Utilize iomap interfaceWilliam Breathitt Gray
This driver doesn't need to access I/O ports directly via inb()/outb() and friends. This patch abstracts such access by calling ioport_map() to enable the use of more typical ioread8()/iowrite8() I/O memory accessor calls. Link: https://lore.kernel.org/r/861c003318dce3d2bef4061711643bb04f5ec14f.1652201921.git.william.gray@linaro.org Cc: Syed Nayyar Waris <syednwaris@gmail.com> Suggested-by: David Laight <David.Laight@ACULAB.COM> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Link: https://lore.kernel.org/r/e971b897cacfac4cb2eca478f5533d2875f5cadd.1657813472.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-06counter: 104-quad-8: Fix use-after-free by quad8_irq_handlerWilliam Breathitt Gray
On unbind an irq might be pending which results in quad8_irq_handler() calling counter_push_event() for a counter that is already unregistered. This patch fixes that situation by passing the struct counter_device dev to devm_request_irq() rather than the parent's so that the irq handler is cleaned before the counter is unregistered. Fixes: 7aa2ba0df651 ("counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8") Cc: Syed Nayyar Waris <syednwaris@gmail.com> Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/20220105093052.258791-1-vilhelm.gray@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-30counter: 104-quad-8: Convert to new counter registrationUwe Kleine-König
This fixes device lifetime issues where it was possible to free a live struct device. Fixes: f1d8a071d45b ("counter: 104-quad-8: Add Generic Counter interface support") Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20211230150300.72196-16-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-30counter: 104-quad-8: Convert to counter_priv() wrapperUwe Kleine-König
This is a straight forward conversion to the new counter_priv() wrapper. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20211230150300.72196-6-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-21counter: 104-quad-8: Fix persistent enabled events bugWilliam Breathitt Gray
A bug exists if the user executes a COUNTER_ADD_WATCH_IOCTL ioctl call, and then executes a COUNTER_DISABLE_EVENTS_IOCTL ioctl call. Disabling the events should disable the 104-QUAD-8 interrupts, but because of this bug the interrupts are not disabling. The reason this bug is occurring is because quad8_events_configure() is called when COUNTER_DISABLE_EVENTS_IOCTL is handled, but the next_irq_trigger[] array has not been cleared before it is checked in the loop. This patch fixes the bug by removing the next_irq_trigger array and instead utilizing a different algorithm of walking the events_list list for the current requested events. When a COUNTER_DISABLE_EVENTS_IOCTL is handled, events_list will be empty and thus all device channels end up with interrupts disabled. Fixes: 7aa2ba0df651 ("counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8") Cc: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/5fd5731cec1c251acee30eefb7c19160d03c9d39.1640072891.git.vilhelm.gray@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-10-17counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8William Breathitt Gray
The LSI/CSI LS7266R1 chip provides programmable output via the FLG pins. When interrupts are enabled on the ACCES 104-QUAD-8, they occur whenever FLG1 is active. Four functions are available for the FLG1 signal: Carry, Compare, Carry-Borrow, and Index. Carry: Interrupt generated on active low Carry signal. Carry signal toggles every time the respective channel's counter overflows. Compare: Interrupt generated on active low Compare signal. Compare signal toggles every time respective channel's preset register is equal to the respective channel's counter. Carry-Borrow: Interrupt generated on active low Carry signal and active low Borrow signal. Carry signal toggles every time the respective channel's counter overflows. Borrow signal toggles every time the respective channel's counter underflows. Index: Interrupt generated on active high Index signal. These four functions correspond respectivefly to the following four Counter event types: COUNTER_EVENT_OVERFLOW, COUNTER_EVENT_THRESHOLD, COUNTER_EVENT_OVERFLOW_UNDERFLOW, and COUNTER_EVENT_INDEX. Interrupts push Counter events to event channel X, where 'X' is the respective channel whose FLG1 activated. This patch adds IRQ support for the ACCES 104-QUAD-8. The interrupt line numbers for the devices may be configured via the irq array module parameter. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/e3a28e100840e3a336fa93fce77445f0e9d9a674.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-10-17counter: 104-quad-8: Replace mutex with spinlockWilliam Breathitt Gray
This patch replaces the mutex I/O lock with a spinlock. This is in preparation for a subsequent patch adding IRQ support for 104-QUAD-8 devices; we can't sleep in an interrupt context, so we'll need to use a spinlock instead. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/3f74491dec66de10d062978bcb7b9c2b3bdea86c.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-10-17counter: Internalize sysfs interface codeWilliam Breathitt Gray
This is a reimplementation of the Generic Counter driver interface. There are no modifications to the Counter subsystem userspace interface, so existing userspace applications should continue to run seamlessly. The purpose of this patch is to internalize the sysfs interface code among the various counter drivers into a shared module. Counter drivers pass and take data natively (i.e. u8, u64, etc.) and the shared counter module handles the translation between the sysfs interface and the device drivers. This guarantees a standard userspace interface for all counter drivers, and helps generalize the Generic Counter driver ABI in order to support the Generic Counter chrdev interface (introduced in a subsequent patch) without significant changes to the existing counter drivers. Note, Counter device registration is the same as before: drivers populate a struct counter_device with components and callbacks, then pass the structure to the devm_counter_register function. However, what's different now is how the Counter subsystem code handles this registration internally. Whereas before callbacks would interact directly with sysfs data, this interaction is now abstracted and instead callbacks interact with native C data types. The counter_comp structure forms the basis for Counter extensions. The counter-sysfs.c file contains the code to parse through the counter_device structure and register the requested components and extensions. Attributes are created and populated based on type, with respective translation functions to handle the mapping between sysfs and the counter driver callbacks. The translation performed for each attribute is straightforward: the attribute type and data is parsed from the counter_attribute structure, the respective counter driver read/write callback is called, and sysfs I/O is handled before or after the driver read/write function is called. Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com> Cc: Patrick Havelange <patrick.havelange@essensium.com> Cc: Kamel Bouhara <kamel.bouhara@bootlin.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Reviewed-by: David Lechner <david@lechnology.com> Tested-by: David Lechner <david@lechnology.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> # for stm32 Link: https://lore.kernel.org/r/c68b4a1ffb195c1a2f65e8dd5ad7b7c14e79c6ef.1630031207.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: 104-quad-8: Describe member 'lock' in 'quad8'William Breathitt Gray
This adds a kernel-doc comment line describing the 'lock' member of the 'quad8' structure. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/43b4acab9e238638c7067dd4a363a42f94c94ccb.1628511445.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: Rename counter_count_function to counter_functionWilliam Breathitt Gray
The phrase "Counter Count function" is verbose and unintentionally implies that function is a Count extension. This patch adjusts the Counter subsystem code to use the more direct "Counter function" phrase to make the intent of this code clearer. Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com> Cc: Patrick Havelange <patrick.havelange@essensium.com> Cc: Oleksij Rempel <o.rempel@pengutronix.de> Cc: Kamel Bouhara <kamel.bouhara@bootlin.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: David Lechner <david@lechnology.com> Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/8268c54d6f42075a19bb08151a37831e22652499.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: Rename counter_signal_value to counter_signal_levelWilliam Breathitt Gray
Signal values will always be levels so let's be explicit it about it to make the intent of the code clear. Cc: Oleksij Rempel <o.rempel@pengutronix.de> Cc: Kamel Bouhara <kamel.bouhara@bootlin.com> Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Reviewed-by: David Lechner <david@lechnology.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/3f17010abe2415859cea9a5fddabd3c97f635ff5.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: Standardize to ERANGE for limit exceeded errorsWilliam Breathitt Gray
ERANGE is a semantically better error code to return when an argument value falls outside the supported limit range of a device. Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com> Cc: Oleksij Rempel <o.rempel@pengutronix.de> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Reviewed-by: David Lechner <david@lechnology.com> Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/ae8d3b20b8b02c96b1c9898ffa2f9fa5d99edc81.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: Return error code on invalid modesWilliam Breathitt Gray
Only a select set of modes (function, action, etc.) are valid for a given device configuration. This patch ensures that invalid modes result in a return -EINVAL. Such a situation should never occur in reality, but it's good to define a default switch case for the sake of making the intent of the code clear. Cc: Kamel Bouhara <kamel.bouhara@bootlin.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Acked-by: David Lechner <david@lechnology.com> Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/7af82d4e39610da11edce0ee370285fe1cb1eac8.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09counter: 104-quad-8: Return error when invalid mode during ceiling_writeWilliam Breathitt Gray
The 104-QUAD-8 only has two count modes where a ceiling value makes sense: Range Limit and Modulo-N. Outside of these two modes, setting a ceiling value is an invalid operation -- so let's report it as such by returning -EINVAL. Fixes: fc069262261c ("counter: 104-quad-8: Add lock guards - generic interface") Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/a2147f022829b66839a1db5530a7fada47856847.1627990337.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-09counter: 104-quad-8: Add const qualifier for actions_list arrayWilliam Breathitt Gray
The struct counter_synapse actions_list member expects a const enum counter_synapse_action array. This patch adds the const qualifier to the quad8_index_actions_list and quad8_synapse_actions_list to match actions_list. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/776ba3ad0a3c609d3600cffe0ed6446baf29fee9.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-09counter: 104-quad-8: Add const qualifier for functions_list arrayWilliam Breathitt Gray
The struct counter_count functions_list member expects a const enum counter_count_function array. This patch adds the const qualifier to the quad8_count_functions_list to match functions_list. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/6847da7553208e7f2554e6c7688e2021f7e19716.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-09counter: 104-quad-8: Add const qualifiers for quad8_preset_register_setWilliam Breathitt Gray
Add some safety by qualifying the quad8_preset_register_set() function parameters as const. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/050f1b518eeae8e3683f7d6d11f3219a137adf48.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-09counter: 104-quad-8: Annotate hardware config module parameterWilliam Breathitt Gray
When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. To this end, annotate module_param* statements that refer to hardware configuration and indicate for future reference what type of parameter they specify. The parameter parser in the core sees this information and can skip such parameters with an error message if the kernel is locked down. The module initialisation then runs as normal, but just sees whatever the default values for those parameters is. Note that we do still need to do the module initialisation because some drivers have viable defaults set in case parameters aren't specified and some drivers support automatic configuration (e.g. PNP or PCI) in addition to manually coded parameters. This patch annotates the 104-QUAD-8 driver. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/97ce79878a26809f0b15b2eac9a86ca39e0ecd74.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-09counter: 104-quad-8: Remove pointless commentWilliam Breathitt Gray
It is obvious that devm_counter_register() is used to register a Counter device, so a comment stating such is pointless here. Acked-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/77e9f3daa091d0ad0ee56b8973705dd03db85dd4.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-11counter: 104-quad-8: Remove IIO counter ABIWilliam Breathitt Gray
The IIO counter driver has been superseded by the Counter subsystem as discussed in [1]. This patch removes the IIO counter ABI from the 104-QUAD-8 driver. [1] https://lore.kernel.org/lkml/20210119104105.000010df@Huawei.com/ Cc: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Link: https://lore.kernel.org/r/98a39983d5df761c058a469d1346fd8ffdef8516.1611973018.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-07-20Merge 5.8-rc6 into staging-nextGreg Kroah-Hartman
We need the staging fixes in here, and it resolves a merge issue with an iio driver. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-06-14counter: 104-quad-8: Add lock guards - filter clock prescalerSyed Nayyar Waris
Add lock protection from race conditions to the 104-quad-8 counter driver for filter clock prescaler code changes. Mutex calls used for protection. Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com> Fixes: de65d0556343 ("counter: 104-quad-8: Support Filter Clock Prescaler") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-06-14counter: 104-quad-8: Add lock guards - differential encoderSyed Nayyar Waris
Add lock protection from race conditions to 104-quad-8 counter driver for differential encoder status code changes. Mutex lock calls used for protection. Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com> Fixes: 954ab5cc5f3e ("counter: 104-quad-8: Support Differential Encoder Cable Status") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-06-14iio: remove explicit IIO device parent assignmentAlexandru Ardelean
This patch applies the semantic patch: @@ expression I, P, SP; @@ I = devm_iio_device_alloc(P, SP); ... - I->dev.parent = P; It updates 302 files and does 307 deletions. This semantic patch also removes some comments like '/* Establish that the iio_dev is a child of the i2c device */' But this is is only done in case where the block is left empty. The patch does not seem to cover all cases. It looks like in some cases a different variable is used in some cases to assign the parent, but it points to the same reference. In other cases, the block covered by ... may be just too big to be covered by the semantic patch. However, this looks pretty good as well, as it does cover a big bulk of the drivers that should remove the parent assignment. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-04-19counter: 104-quad-8: Add lock guards - generic interfaceSyed Nayyar Waris
Add lock protection from race conditions to 104-quad-8 counter driver generic interface code changes. Mutex calls used for protection. Fixes: f1d8a071d45b ("counter: 104-quad-8: Add Generic Counter interface support") Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-03-08counter: 104-quad-8: Support Differential Encoder Cable StatusWilliam Breathitt Gray
The ACCES 104-QUAD-8 series provides status information about the connection state of the differential encoder cable inputs. This patch implements support to expose such information from these devices. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-03-08counter: 104-quad-8: Support Filter Clock PrescalerWilliam Breathitt Gray
The ACCES 104-QUAD-8 series does active filtering on the quadrature input signals via the PC/104 bus clock (OSC 14.318 MHz). This patch exposes the filter clock prescaler available on each channel. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-10-18counter: Simplify the count_read and count_write callbacksWilliam Breathitt Gray
The count_read and count_write callbacks are simplified to pass val as unsigned long rather than as an opaque data structure. The opaque counter_count_read_value and counter_count_write_value structures, counter_count_value_type enum, and relevant counter_count_read_value_set and counter_count_write_value_get functions, are removed as they are no longer used. Cc: Patrick Havelange <patrick.havelange@essensium.com> Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com> Acked-by: David Lechner <david@lechnology.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-05-24counter: 104-quad-8: Make quad8_ops staticYueHaibing
Fix sparse warning: drivers/counter/104-quad-8.c:836:26: warning: symbol 'quad8_ops' was not declared. Should it be static? Signed-off-by: YueHaibing <yuehaibing@huawei.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25counter: 104-quad-8: Add Generic Counter interface supportWilliam Breathitt Gray
This patch adds support for the Generic Counter interface to the 104-QUAD-8 driver. The existing 104-QUAD-8 device interface should not be affected by this patch; all changes are intended as supplemental additions as perceived by the user. Generic Counter Counts are created for the eight quadrature channel counts, as well as their respective quadrature A and B Signals (which are associated via respective Synapse structures) and respective index Signals. The new Generic Counter interface sysfs attributes are intended to expose the same functionality and data available via the existing 104-QUAD-8 IIO device interface; the Generic Counter interface serves to provide the respective functionality and data in a standard way expected of counter devices. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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