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195 lines
4.6 KiB
195 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com> |
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* |
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* Original author: |
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* Ben Collins <[email protected]> |
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* |
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* Additional work by: |
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* John Brooks <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/fs.h> |
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#include <linux/delay.h> |
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#include <linux/uaccess.h> |
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#include "solo6x10.h" |
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static void solo_gpio_mode(struct solo_dev *solo_dev, |
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unsigned int port_mask, unsigned int mode) |
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{ |
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int port; |
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unsigned int ret; |
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ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0); |
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/* To set gpio */ |
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for (port = 0; port < 16; port++) { |
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if (!((1 << port) & port_mask)) |
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continue; |
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ret &= (~(3 << (port << 1))); |
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ret |= ((mode & 3) << (port << 1)); |
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} |
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solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_0, ret); |
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/* To set extended gpio - sensor */ |
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ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1); |
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for (port = 0; port < 16; port++) { |
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if (!((1UL << (port + 16)) & port_mask)) |
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continue; |
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if (!mode) |
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ret &= ~(1UL << port); |
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else |
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ret |= 1UL << port; |
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} |
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/* Enable GPIO[31:16] */ |
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ret |= 0xffff0000; |
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solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_1, ret); |
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} |
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static void solo_gpio_set(struct solo_dev *solo_dev, unsigned int value) |
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{ |
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solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT, |
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solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) | value); |
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} |
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static void solo_gpio_clear(struct solo_dev *solo_dev, unsigned int value) |
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{ |
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solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT, |
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solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) & ~value); |
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} |
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static void solo_gpio_config(struct solo_dev *solo_dev) |
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{ |
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/* Video reset */ |
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solo_gpio_mode(solo_dev, 0x30, 1); |
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solo_gpio_clear(solo_dev, 0x30); |
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udelay(100); |
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solo_gpio_set(solo_dev, 0x30); |
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udelay(100); |
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/* Warning: Don't touch the next line unless you're sure of what |
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* you're doing: first four gpio [0-3] are used for video. */ |
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solo_gpio_mode(solo_dev, 0x0f, 2); |
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/* We use bit 8-15 of SOLO_GPIO_CONFIG_0 for relay purposes */ |
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solo_gpio_mode(solo_dev, 0xff00, 1); |
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/* Initially set relay status to 0 */ |
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solo_gpio_clear(solo_dev, 0xff00); |
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/* Set input pins direction */ |
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solo_gpio_mode(solo_dev, 0xffff0000, 0); |
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} |
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#ifdef CONFIG_GPIOLIB |
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/* Pins 0-7 are not exported, because it seems from code above they are |
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* used for internal purposes. So offset 0 corresponds to pin 8, therefore |
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* offsets 0-7 are relay GPIOs, 8-23 - input GPIOs. |
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*/ |
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static int solo_gpiochip_get_direction(struct gpio_chip *chip, |
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unsigned int offset) |
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{ |
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int ret, mode; |
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struct solo_dev *solo_dev = gpiochip_get_data(chip); |
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if (offset < 8) { |
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ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0); |
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mode = 3 & (ret >> ((offset + 8) * 2)); |
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} else { |
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ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1); |
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mode = 1 & (ret >> (offset - 8)); |
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} |
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if (!mode) |
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return 1; |
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else if (mode == 1) |
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return 0; |
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return -1; |
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} |
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static int solo_gpiochip_direction_input(struct gpio_chip *chip, |
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unsigned int offset) |
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{ |
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return -1; |
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} |
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static int solo_gpiochip_direction_output(struct gpio_chip *chip, |
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unsigned int offset, int value) |
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{ |
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return -1; |
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} |
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static int solo_gpiochip_get(struct gpio_chip *chip, |
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unsigned int offset) |
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{ |
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int ret; |
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struct solo_dev *solo_dev = gpiochip_get_data(chip); |
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ret = solo_reg_read(solo_dev, SOLO_GPIO_DATA_IN); |
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return 1 & (ret >> (offset + 8)); |
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} |
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static void solo_gpiochip_set(struct gpio_chip *chip, |
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unsigned int offset, int value) |
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{ |
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struct solo_dev *solo_dev = gpiochip_get_data(chip); |
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if (value) |
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solo_gpio_set(solo_dev, 1 << (offset + 8)); |
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else |
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solo_gpio_clear(solo_dev, 1 << (offset + 8)); |
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} |
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#endif |
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int solo_gpio_init(struct solo_dev *solo_dev) |
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{ |
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#ifdef CONFIG_GPIOLIB |
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int ret; |
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#endif |
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solo_gpio_config(solo_dev); |
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#ifdef CONFIG_GPIOLIB |
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solo_dev->gpio_dev.label = SOLO6X10_NAME"_gpio"; |
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solo_dev->gpio_dev.parent = &solo_dev->pdev->dev; |
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solo_dev->gpio_dev.owner = THIS_MODULE; |
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solo_dev->gpio_dev.base = -1; |
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solo_dev->gpio_dev.ngpio = 24; |
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solo_dev->gpio_dev.can_sleep = 0; |
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solo_dev->gpio_dev.get_direction = solo_gpiochip_get_direction; |
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solo_dev->gpio_dev.direction_input = solo_gpiochip_direction_input; |
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solo_dev->gpio_dev.direction_output = solo_gpiochip_direction_output; |
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solo_dev->gpio_dev.get = solo_gpiochip_get; |
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solo_dev->gpio_dev.set = solo_gpiochip_set; |
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ret = gpiochip_add_data(&solo_dev->gpio_dev, solo_dev); |
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if (ret) { |
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solo_dev->gpio_dev.label = NULL; |
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return -1; |
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} |
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#endif |
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return 0; |
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} |
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void solo_gpio_exit(struct solo_dev *solo_dev) |
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{ |
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#ifdef CONFIG_GPIOLIB |
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if (solo_dev->gpio_dev.label) { |
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gpiochip_remove(&solo_dev->gpio_dev); |
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solo_dev->gpio_dev.label = NULL; |
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} |
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#endif |
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solo_gpio_clear(solo_dev, 0x30); |
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solo_gpio_config(solo_dev); |
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}
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