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Linus Torvalds
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Jan 11, 2011
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| --- | ||
| refs/heads/master: 92f1c008ae79e32b83c0607d184b194f302bb3ee | ||
| refs/heads/master: 7bc4a4ce68f8c6d064ea949446852e996526f692 |
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| Kernel driver gpio-i2cmux | ||
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| Author: Peter Korsgaard <peter.korsgaard@barco.com> | ||
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| Description | ||
| ----------- | ||
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| gpio-i2cmux is an i2c mux driver providing access to I2C bus segments | ||
| from a master I2C bus and a hardware MUX controlled through GPIO pins. | ||
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| E.G.: | ||
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| ---------- ---------- Bus segment 1 - - - - - | ||
| | | SCL/SDA | |-------------- | | | ||
| | |------------| | | ||
| | | | | Bus segment 2 | | | ||
| | Linux | GPIO 1..N | MUX |--------------- Devices | ||
| | |------------| | | | | ||
| | | | | Bus segment M | ||
| | | | |---------------| | | ||
| ---------- ---------- - - - - - | ||
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| SCL/SDA of the master I2C bus is multiplexed to bus segment 1..M | ||
| according to the settings of the GPIO pins 1..N. | ||
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| Usage | ||
| ----- | ||
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| gpio-i2cmux uses the platform bus, so you need to provide a struct | ||
| platform_device with the platform_data pointing to a struct | ||
| gpio_i2cmux_platform_data with the I2C adapter number of the master | ||
| bus, the number of bus segments to create and the GPIO pins used | ||
| to control it. See include/linux/gpio-i2cmux.h for details. | ||
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| E.G. something like this for a MUX providing 4 bus segments | ||
| controlled through 3 GPIO pins: | ||
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| #include <linux/gpio-i2cmux.h> | ||
| #include <linux/platform_device.h> | ||
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| static const unsigned myboard_gpiomux_gpios[] = { | ||
| AT91_PIN_PC26, AT91_PIN_PC25, AT91_PIN_PC24 | ||
| }; | ||
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| static const unsigned myboard_gpiomux_values[] = { | ||
| 0, 1, 2, 3 | ||
| }; | ||
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| static struct gpio_i2cmux_platform_data myboard_i2cmux_data = { | ||
| .parent = 1, | ||
| .base_nr = 2, /* optional */ | ||
| .values = myboard_gpiomux_values, | ||
| .n_values = ARRAY_SIZE(myboard_gpiomux_values), | ||
| .gpios = myboard_gpiomux_gpios, | ||
| .n_gpios = ARRAY_SIZE(myboard_gpiomux_gpios), | ||
| .idle = 4, /* optional */ | ||
| }; | ||
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| static struct platform_device myboard_i2cmux = { | ||
| .name = "gpio-i2cmux", | ||
| .id = 0, | ||
| .dev = { | ||
| .platform_data = &myboard_i2cmux_data, | ||
| }, | ||
| }; |
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| /* | ||
| * include/asm-arm/arch-tegra/include/mach/sdhci.h | ||
| * | ||
| * Copyright (C) 2009 Palm, Inc. | ||
| * Author: Yvonne Yip <y@palm.com> | ||
| * | ||
| * This software is licensed under the terms of the GNU General Public | ||
| * License version 2, as published by the Free Software Foundation, and | ||
| * may be copied, distributed, and modified under those terms. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| */ | ||
| #ifndef __ASM_ARM_ARCH_TEGRA_SDHCI_H | ||
| #define __ASM_ARM_ARCH_TEGRA_SDHCI_H | ||
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| #include <linux/mmc/host.h> | ||
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| struct tegra_sdhci_platform_data { | ||
| int cd_gpio; | ||
| int wp_gpio; | ||
| int power_gpio; | ||
| int is_8bit; | ||
| }; | ||
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| #endif |
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