mirror of
https://github.com/freebsd/freebsd-src
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2c1b8eb29d
Use ftgpio_group_get_status instead of inlining an imperfect version of it to get correct register and avoid panic: ftgpio_group_get_ioreg: invalid register 0 for group 0 Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/677
605 lines
16 KiB
C
605 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2016-2023 Stormshield
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/eventhandler.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <dev/gpio/gpiobusvar.h>
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#include <dev/superio/superio.h>
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#include "gpio_if.h"
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#define GPIO_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \
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device_get_nameunit(dev), NULL, MTX_DEF)
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#define GPIO_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx)
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#define GPIO_LOCK(_sc) mtx_lock(&(_sc)->mtx)
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#define GPIO_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
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#define GPIO_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED)
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#define GPIO_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED)
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/* Global register set */
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#define GPIO4_ENABLE 0x28
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#define GPIO3_ENABLE 0x29
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#define FULL_UR5_UR6 0x2A
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#define GPIO1_ENABLE 0x2B
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#define GPIO2_ENABLE 0x2C
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/* Logical Device Numbers. */
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#define FTGPIO_LDN_GPIO 0x06
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#define FTGPIO_MAX_GROUP 6
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#define FTGPIO_MAX_PIN 52
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#define FTGPIO_IS_VALID_PIN(_p) ((_p) >= 0 && (_p) <= FTGPIO_MAX_PIN)
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#define FTGPIO_PIN_GETINDEX(_p) ((_p) & 7)
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#define FTGPIO_PIN_GETGROUP(_p) ((_p) >> 3)
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#define FTGPIO_GPIO_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_INVIN | \
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GPIO_PIN_INVOUT | GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)
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#define GET_BIT(_v, _b) (((_v) >> (_b)) & 1)
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#define FTGPIO_VERBOSE_PRINTF(dev, ...) \
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do { \
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if (__predict_false(bootverbose)) \
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device_printf(dev, __VA_ARGS__); \
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} while (0)
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/*
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* Note that the values are important.
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* They match actual register offsets.
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* See p71 and p72 of F81865's datasheet.
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*/
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#define REG_OUTPUT_ENABLE 0 /* Not for GPIO0 */
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#define REG_OUTPUT_DATA 1
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#define REG_PIN_STATUS 2
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#define REG_DRIVE_ENABLE 3
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#define REG_MODE_SELECT_1 4 /* Only for GPIO0 */
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#define REG_MODE_SELECT_2 5 /* Only for GPIO0 */
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#define REG_PULSE_WIDTH_SELECT_1 6 /* Only for GPIO0 */
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#define REG_PULSE_WIDTH_SELECT_2 7 /* Only for GPIO0 */
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#define REG_INTERRUPT_ENABLE 8 /* Only for GPIO0 */
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#define REG_INTERRUPT_STATUS 9 /* Only for GPIO0 */
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struct ftgpio_device {
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uint16_t devid;
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const char *descr;
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} ftgpio_devices[] = {
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{
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.devid = 0x0704,
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.descr = "Fintek F81865",
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},
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};
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struct ftgpio_softc {
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device_t dev;
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device_t busdev;
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struct mtx mtx;
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struct gpio_pin pins[FTGPIO_MAX_PIN + 1];
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};
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static uint8_t
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ftgpio_group_get_ioreg(struct ftgpio_softc *sc, uint8_t reg, unsigned group)
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{
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uint8_t ioreg;
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KASSERT((group == 0 && REG_OUTPUT_DATA <= reg && reg <= REG_INTERRUPT_STATUS) || \
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(group >= 1 && reg <= REG_DRIVE_ENABLE),
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("%s: invalid register %u for group %u", __func__, reg, group));
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ioreg = (((0xf - group) << 4) + reg);
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return (ioreg);
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}
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static uint8_t
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ftgpio_group_get_output(struct ftgpio_softc *sc, unsigned group)
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{
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uint8_t ioreg, val;
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ioreg = ftgpio_group_get_ioreg(sc, REG_OUTPUT_DATA, group);
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val = superio_read(sc->dev, ioreg);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "group GPIO%u output is 0x%x (ioreg=0x%x)\n",
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group, val, ioreg);
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return (val);
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}
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static void
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ftgpio_group_set_output(struct ftgpio_softc *sc, unsigned group, uint8_t group_value)
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{
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uint8_t ioreg;
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ioreg = ftgpio_group_get_ioreg(sc, REG_OUTPUT_DATA, group);
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superio_write(sc->dev, ioreg, group_value);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "set group GPIO%u output to 0x%x (ioreg=0x%x)\n",
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group, group_value, ioreg);
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}
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static uint8_t
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ftgpio_group_get_status(struct ftgpio_softc *sc, unsigned group)
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{
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uint8_t ioreg;
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ioreg = ftgpio_group_get_ioreg(sc, REG_PIN_STATUS, group);
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return (superio_read(sc->dev, ioreg));
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}
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static void
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ftgpio_pin_write(struct ftgpio_softc *sc, uint32_t pin_num, bool pin_value)
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{
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uint32_t pin_flags;
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uint8_t val;
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unsigned group, index;
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GPIO_ASSERT_LOCKED(sc);
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index = FTGPIO_PIN_GETINDEX(pin_num);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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pin_flags = sc->pins[pin_num].gp_flags;
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if ((pin_flags & (GPIO_PIN_OUTPUT)) == 0) {
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FTGPIO_VERBOSE_PRINTF(sc->dev, "pin %u<GPIO%u%u> is not configured for output\n",
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pin_num, group, index);
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return;
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}
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FTGPIO_VERBOSE_PRINTF(sc->dev, "set pin %u<GPIO%u%u> to %s\n",
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pin_num, group, index, (pin_value ? "on" : "off"));
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val = ftgpio_group_get_output(sc, group);
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if (!pin_value != !(pin_flags & GPIO_PIN_INVOUT))
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val |= (1 << index);
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else
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val &= ~(1 << index);
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ftgpio_group_set_output(sc, group, val);
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}
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static bool
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ftgpio_pin_read(struct ftgpio_softc *sc, uint32_t pin_num)
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{
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uint32_t pin_flags;
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unsigned group, index;
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uint8_t val;
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bool pin_value;
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GPIO_ASSERT_LOCKED(sc);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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index = FTGPIO_PIN_GETINDEX(pin_num);
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pin_flags = sc->pins[pin_num].gp_flags;
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if ((pin_flags & (GPIO_PIN_OUTPUT | GPIO_PIN_INPUT)) == 0) {
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FTGPIO_VERBOSE_PRINTF(sc->dev, "pin %u<GPIO%u%u> is not configured for input or output\n",
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pin_num, group, index);
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return (false);
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}
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if (pin_flags & GPIO_PIN_OUTPUT)
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val = ftgpio_group_get_output(sc, group);
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else
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val = ftgpio_group_get_status(sc, group);
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pin_value = GET_BIT(val, index);
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if (((pin_flags & (GPIO_PIN_OUTPUT|GPIO_PIN_INVOUT)) == (GPIO_PIN_OUTPUT|GPIO_PIN_INVOUT)) ||
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((pin_flags & (GPIO_PIN_INPUT |GPIO_PIN_INVIN )) == (GPIO_PIN_INPUT |GPIO_PIN_INVIN)))
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pin_value = !pin_value;
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FTGPIO_VERBOSE_PRINTF(sc->dev, "pin %u<GPIO%u%u> is %s\n",
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pin_num, group, index, (pin_value ? "on" : "off"));
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return (pin_value);
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}
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static void
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ftgpio_pin_set_drive(struct ftgpio_softc *sc, uint32_t pin_num, bool pin_drive)
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{
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unsigned group, index;
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uint8_t group_drive, ioreg;
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index = FTGPIO_PIN_GETINDEX(pin_num);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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ioreg = ftgpio_group_get_ioreg(sc, REG_DRIVE_ENABLE, group);
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group_drive = superio_read(sc->dev, ioreg);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "group GPIO%u drive is 0x%x (ioreg=0x%x)\n",
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group, group_drive, ioreg);
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if (pin_drive)
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group_drive |= (1 << index); /* push pull */
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else
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group_drive &= ~(1 << index); /* open drain */
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superio_write(sc->dev, ioreg, group_drive);
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}
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static bool
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ftgpio_pin_is_pushpull(struct ftgpio_softc *sc, uint32_t pin_num)
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{
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unsigned group, index;
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uint8_t group_drive, ioreg;
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bool is_pushpull;
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index = FTGPIO_PIN_GETINDEX(pin_num);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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ioreg = ftgpio_group_get_ioreg(sc, REG_DRIVE_ENABLE, group);
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group_drive = superio_read(sc->dev, ioreg);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "group GPIO%u drive is 0x%x (ioreg=0x%x)\n",
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group, group_drive, ioreg);
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is_pushpull = group_drive & (1 << index);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "pin %u<GPIO%u%u> drive is %s\n",
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pin_num, group, index, (is_pushpull ? "pushpull" : "opendrain"));
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return (is_pushpull);
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}
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static void
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ftgpio_pin_set_io(struct ftgpio_softc *sc, uint32_t pin_num, bool pin_io)
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{
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unsigned group, index;
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uint8_t group_io, ioreg;
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index = FTGPIO_PIN_GETINDEX(pin_num);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "set pin %u<GPIO%u%u> io to %s\n",
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pin_num, group, index, (pin_io ? "output" : "input"));
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ioreg = ftgpio_group_get_ioreg(sc, REG_OUTPUT_ENABLE, group);
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group_io = superio_read(sc->dev, ioreg);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "group GPIO%u io is 0x%x (ioreg=0x%x)\n",
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group, group_io, ioreg);
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if (pin_io)
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group_io |= (1 << index); /* output */
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else
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group_io &= ~(1 << index); /* input */
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superio_write(sc->dev, ioreg, group_io);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "set group GPIO%u io to 0x%x (ioreg=0x%x)\n",
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group, group_io, ioreg);
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}
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static bool
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ftgpio_pin_is_output(struct ftgpio_softc *sc, uint32_t pin_num)
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{
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unsigned group, index;
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bool is_output;
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index = FTGPIO_PIN_GETINDEX(pin_num);
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group = FTGPIO_PIN_GETGROUP(pin_num);
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is_output = ftgpio_group_get_status(sc, group) & (1 << index);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "pin %u<GPIO%u%u> io is %s\n",
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pin_num, group, index, (is_output ? "output" : "input"));
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return (is_output);
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}
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static int
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ftgpio_pin_setflags(struct ftgpio_softc *sc, uint32_t pin_num, uint32_t pin_flags)
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{
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/* check flags consistency */
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if ((pin_flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) ==
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(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT))
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return (EINVAL);
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if ((pin_flags & (GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL)) ==
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(GPIO_PIN_OPENDRAIN | GPIO_PIN_PUSHPULL))
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return (EINVAL);
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if (pin_flags & GPIO_PIN_OPENDRAIN)
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ftgpio_pin_set_drive(sc, pin_num, 0 /* open drain */);
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else if (pin_flags & GPIO_PIN_PUSHPULL)
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ftgpio_pin_set_drive(sc, pin_num, 1 /* push pull */);
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if (pin_flags & GPIO_PIN_INPUT)
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ftgpio_pin_set_io(sc, pin_num, 0 /* input */);
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else if (pin_flags & GPIO_PIN_OUTPUT)
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ftgpio_pin_set_io(sc, pin_num, 1 /* output */);
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sc->pins[pin_num].gp_flags = pin_flags;
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return (0);
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}
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static int
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ftgpio_probe(device_t dev)
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{
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uint16_t devid;
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int i;
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if (superio_vendor(dev) != SUPERIO_VENDOR_FINTEK)
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return (ENXIO);
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if (superio_get_type(dev) != SUPERIO_DEV_GPIO)
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return (ENXIO);
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/*
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* There are several GPIO devices, we attach only to one of them
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* and use the rest without attaching.
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*/
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if (superio_get_ldn(dev) != FTGPIO_LDN_GPIO)
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return (ENXIO);
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devid = superio_devid(dev);
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for (i = 0; i < nitems(ftgpio_devices); i++) {
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if (devid == ftgpio_devices[i].devid) {
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device_set_desc(dev, ftgpio_devices[i].descr);
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return (BUS_PROBE_DEFAULT);
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}
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}
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return (ENXIO);
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}
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static int
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ftgpio_attach(device_t dev)
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{
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struct ftgpio_softc *sc;
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int i;
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sc = device_get_softc(dev);
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sc->dev = dev;
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GPIO_LOCK_INIT(sc);
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GPIO_LOCK(sc);
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for (i = 0; i <= FTGPIO_MAX_PIN; i++) {
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struct gpio_pin *pin;
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pin = &sc->pins[i];
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pin->gp_pin = i;
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pin->gp_caps = FTGPIO_GPIO_CAPS;
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pin->gp_flags = 0;
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if (ftgpio_pin_is_output(sc, i))
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pin->gp_flags |= GPIO_PIN_OUTPUT;
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else
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pin->gp_flags |= GPIO_PIN_INPUT;
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if (ftgpio_pin_is_pushpull(sc, i))
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pin->gp_flags |= GPIO_PIN_PUSHPULL;
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else
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pin->gp_flags |= GPIO_PIN_OPENDRAIN;
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snprintf(pin->gp_name, GPIOMAXNAME, "GPIO%u%u",
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FTGPIO_PIN_GETGROUP(i), FTGPIO_PIN_GETINDEX(i));
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}
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/* Enable all groups */
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superio_write(sc->dev, GPIO1_ENABLE, 0xFF);
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superio_write(sc->dev, GPIO2_ENABLE, 0xFF);
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superio_write(sc->dev, GPIO3_ENABLE, 0xFF);
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superio_write(sc->dev, GPIO4_ENABLE, 0xFF);
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superio_write(sc->dev, FULL_UR5_UR6, 0x0A);
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FTGPIO_VERBOSE_PRINTF(sc->dev, "groups GPIO1..GPIO6 enabled\n");
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GPIO_UNLOCK(sc);
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sc->busdev = gpiobus_attach_bus(dev);
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if (sc->busdev == NULL) {
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GPIO_LOCK_DESTROY(sc);
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return (ENXIO);
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}
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return (0);
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}
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static int
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ftgpio_detach(device_t dev)
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{
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struct ftgpio_softc *sc;
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sc = device_get_softc(dev);
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gpiobus_detach_bus(dev);
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GPIO_ASSERT_UNLOCKED(sc);
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GPIO_LOCK_DESTROY(sc);
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return (0);
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}
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static device_t
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ftgpio_gpio_get_bus(device_t dev)
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{
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struct ftgpio_softc *sc;
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sc = device_get_softc(dev);
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return (sc->busdev);
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}
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static int
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ftgpio_gpio_pin_max(device_t dev, int *npins)
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{
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*npins = FTGPIO_MAX_PIN;
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return (0);
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}
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static int
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ftgpio_gpio_pin_set(device_t dev, uint32_t pin_num, uint32_t pin_value)
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{
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struct ftgpio_softc *sc;
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if (!FTGPIO_IS_VALID_PIN(pin_num))
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return (EINVAL);
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sc = device_get_softc(dev);
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GPIO_LOCK(sc);
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if ((sc->pins[pin_num].gp_flags & GPIO_PIN_OUTPUT) == 0) {
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GPIO_UNLOCK(sc);
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return (EINVAL);
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}
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ftgpio_pin_write(sc, pin_num, pin_value);
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GPIO_UNLOCK(sc);
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return (0);
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}
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static int
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ftgpio_gpio_pin_get(device_t dev, uint32_t pin_num, uint32_t *pin_value)
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{
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struct ftgpio_softc *sc;
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if (!FTGPIO_IS_VALID_PIN(pin_num))
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return (EINVAL);
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if (pin_value == NULL)
|
|
return (EINVAL);
|
|
|
|
sc = device_get_softc(dev);
|
|
GPIO_LOCK(sc);
|
|
*pin_value = ftgpio_pin_read(sc, pin_num);
|
|
GPIO_UNLOCK(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ftgpio_gpio_pin_toggle(device_t dev, uint32_t pin_num)
|
|
{
|
|
struct ftgpio_softc *sc;
|
|
bool pin_value;
|
|
|
|
if (!FTGPIO_IS_VALID_PIN(pin_num))
|
|
return (EINVAL);
|
|
|
|
sc = device_get_softc(dev);
|
|
GPIO_LOCK(sc);
|
|
pin_value = ftgpio_pin_read(sc, pin_num);
|
|
ftgpio_pin_write(sc, pin_num, !pin_value);
|
|
GPIO_UNLOCK(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ftgpio_gpio_pin_getname(device_t dev, uint32_t pin_num, char *pin_name)
|
|
{
|
|
struct ftgpio_softc *sc;
|
|
|
|
if (pin_name == NULL)
|
|
return (EINVAL);
|
|
|
|
if (!FTGPIO_IS_VALID_PIN(pin_num))
|
|
return (EINVAL);
|
|
|
|
sc = device_get_softc(dev);
|
|
strlcpy(pin_name, sc->pins[pin_num].gp_name, GPIOMAXNAME);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ftgpio_gpio_pin_getcaps(device_t dev, uint32_t pin_num, uint32_t *pin_caps)
|
|
{
|
|
struct ftgpio_softc *sc;
|
|
|
|
if (pin_caps == NULL)
|
|
return (EINVAL);
|
|
|
|
if (!FTGPIO_IS_VALID_PIN(pin_num))
|
|
return (EINVAL);
|
|
|
|
sc = device_get_softc(dev);
|
|
*pin_caps = sc->pins[pin_num].gp_caps;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ftgpio_gpio_pin_getflags(device_t dev, uint32_t pin_num, uint32_t *pin_flags)
|
|
{
|
|
struct ftgpio_softc *sc;
|
|
|
|
if (pin_flags == NULL)
|
|
return (EINVAL);
|
|
|
|
if (!FTGPIO_IS_VALID_PIN(pin_num))
|
|
return (EINVAL);
|
|
|
|
sc = device_get_softc(dev);
|
|
*pin_flags = sc->pins[pin_num].gp_flags;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ftgpio_gpio_pin_setflags(device_t dev, uint32_t pin_num, uint32_t pin_flags)
|
|
{
|
|
struct ftgpio_softc *sc;
|
|
int ret;
|
|
|
|
if (!FTGPIO_IS_VALID_PIN(pin_num)) {
|
|
FTGPIO_VERBOSE_PRINTF(dev, "invalid pin number: %u\n", pin_num);
|
|
return (EINVAL);
|
|
}
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
/* Check for unwanted flags. */
|
|
if ((pin_flags & sc->pins[pin_num].gp_caps) != pin_flags) {
|
|
FTGPIO_VERBOSE_PRINTF(dev, "invalid pin flags 0x%x, vs caps 0x%x\n",
|
|
pin_flags, sc->pins[pin_num].gp_caps);
|
|
return (EINVAL);
|
|
}
|
|
|
|
GPIO_LOCK(sc);
|
|
ret = ftgpio_pin_setflags(sc, pin_num, pin_flags);
|
|
GPIO_UNLOCK(sc);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static device_method_t ftgpio_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, ftgpio_probe),
|
|
DEVMETHOD(device_attach, ftgpio_attach),
|
|
DEVMETHOD(device_detach, ftgpio_detach),
|
|
|
|
/* GPIO */
|
|
DEVMETHOD(gpio_get_bus, ftgpio_gpio_get_bus),
|
|
DEVMETHOD(gpio_pin_max, ftgpio_gpio_pin_max),
|
|
DEVMETHOD(gpio_pin_set, ftgpio_gpio_pin_set),
|
|
DEVMETHOD(gpio_pin_get, ftgpio_gpio_pin_get),
|
|
DEVMETHOD(gpio_pin_toggle, ftgpio_gpio_pin_toggle),
|
|
DEVMETHOD(gpio_pin_getname, ftgpio_gpio_pin_getname),
|
|
DEVMETHOD(gpio_pin_getcaps, ftgpio_gpio_pin_getcaps),
|
|
DEVMETHOD(gpio_pin_getflags, ftgpio_gpio_pin_getflags),
|
|
DEVMETHOD(gpio_pin_setflags, ftgpio_gpio_pin_setflags),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t ftgpio_driver = {
|
|
"gpio",
|
|
ftgpio_methods,
|
|
sizeof(struct ftgpio_softc)
|
|
};
|
|
|
|
DRIVER_MODULE(ftgpio, superio, ftgpio_driver, NULL, NULL);
|
|
MODULE_DEPEND(ftgpio, gpiobus, 1, 1, 1);
|
|
MODULE_DEPEND(ftgpio, superio, 1, 1, 1);
|
|
MODULE_VERSION(ftgpio, 1);
|