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path: root/drivers/gpio/gpio-pcie-idio-24.c
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* gpio: pcie-idio-24: Mask read inputs for get_multipleWilliam Breathitt Gray2018-11-051-1/+1
| | | | | | | | | This patch masks the read inputs with the word mask in order to ensure only requested input states are returned in the bits array. Suggested-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* gpio: pcie-idio-24: Fix off-by-one error in get_multiple loopWilliam Breathitt Gray2018-04-301-1/+1
| | | | | | | | | | | The PCIe-IDIO-24 features 8 bits of TTL GPIO which may be configured for output or input. This patch fixes an off-by-one error in the loop conditional for the get_multiple callback so that the TTL GPIO are handled. Fixes: ca37081595a2 ("gpio: pcie-idio-24: Implement get_multiple/set_multiple callbacks") Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* gpio: pcie-idio-24: Fix port memory offset for get_multiple/set_multiple ↵William Breathitt Gray2018-04-271-10/+10
| | | | | | | | | | | | callbacks The ioread8/iowrite8 functions expect a memory offset argument. This patch fixes the ports array to provide the memory addresses of the respective device I/O registers. Fixes: ca37081595a2 ("gpio: pcie-idio-24: Implement get_multiple/set_multiple callbacks") Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* gpio: pcie-idio-24: Implement get_multiple/set_multiple callbacksWilliam Breathitt Gray2018-03-261-0/+117
| | | | | | | | | | | | | | | The ACCES I/O PCIe-IDIO-24 series of devices provides 24 optically-isolated digital I/O accessed via six 8-bit ports. Since eight input lines are acquired on a single port input read -- and similarly eight output lines are set on a single port output write -- the PCIe-IDIO-24 GPIO driver may improve multiple I/O reads/writes by utilizing a get_multiple/set_multiple callbacks. This patch implements the idio_24_gpio_get_multiple function which serves as the respective get_multiple callback, and implements the idio_24_gpio_set_multiple function which serves as the respective set_multiple callback. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* gpio: Add GPIO support for the ACCES PCIe-IDIO-24 familyWilliam Breathitt Gray2018-01-101-0/+447
The ACCES PCIe-IDIO-24 device provides 56 lines of digital I/O (24 lines of optically-isolated non-polarized digital inputs for AC and DC control signals, 24 lines of isolated solid state FET digital outputs, and 8 non-isolated TTL/CMOS compatible programmable I/O). An interrupt is generated when any of the inputs change state (low to high or high to low). Input filter control is not supported by this driver, and input filters are deactivated by this driver. These devices are capable of get_multiple and set_multiple functionality, but these functions have not yet been implemented for this driver. Change-Of-State (COS) detection functionality may be configured to fire interrupts on exclusively rising/falling edges, but this driver currently only implements COS detection for either both edges or none. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>