[POWERPC] i2c: OF helpers for the i2c API (612212a3) · Commits · 戴 / test

drivers/of/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -7,3 +7,9 @@ config OF_GPIO
		depends on OF && PPC_OF && HAVE_GPIO_LIB
		help
		OpenFirmware GPIO accessors

		config OF_I2C
		def_bool y
		depends on OF && I2C
		help
		OpenFirmware I2C accessors

drivers/of/Makefile

+1 −0

Original line number	Diff line number	Diff line
		obj-y = base.o
		obj-$(CONFIG_OF_DEVICE) += device.o platform.o
		obj-$(CONFIG_OF_GPIO) += gpio.o
		obj-$(CONFIG_OF_I2C) += i2c.o

drivers/of/i2c.c

0 → 100644

+115 −0

Original line number	Diff line number	Diff line
		/*
		* OF helpers for the I2C API
		*
		* Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
		*
		* Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*/

		#include <linux/i2c.h>
		#include <linux/of.h>

		struct i2c_driver_device {
		char *of_device;
		char *i2c_type;
		};

		static struct i2c_driver_device i2c_devices[] = {
		{ "dallas,ds1374", "rtc-ds1374" },
		};

		static int of_find_i2c_driver(struct device_node *node,
		struct i2c_board_info *info)
		{
		int i, cplen;
		const char *compatible;
		const char *p;

		/* 1. search for exception list entry */
		for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
		continue;
		if (strlcpy(info->type, i2c_devices[i].i2c_type,
		I2C_NAME_SIZE) >= I2C_NAME_SIZE)
		return -ENOMEM;

		return 0;
		}

		compatible = of_get_property(node, "compatible", &cplen);
		if (!compatible)
		return -ENODEV;

		/* 2. search for linux,<i2c-type> entry */
		p = compatible;
		while (cplen > 0) {
		if (!strncmp(p, "linux,", 6)) {
		p += 6;
		if (strlcpy(info->type, p,
		I2C_NAME_SIZE) >= I2C_NAME_SIZE)
		return -ENOMEM;
		return 0;
		}

		i = strlen(p) + 1;
		p += i;
		cplen -= i;
		}

		/* 3. take fist compatible entry and strip manufacturer */
		p = strchr(compatible, ',');
		if (!p)
		return -ENODEV;
		p++;
		if (strlcpy(info->type, p, I2C_NAME_SIZE) >= I2C_NAME_SIZE)
		return -ENOMEM;
		return 0;
		}

		void of_register_i2c_devices(struct i2c_adapter *adap,
		struct device_node *adap_node)
		{
		void *result;
		struct device_node *node;

		for_each_child_of_node(adap_node, node) {
		struct i2c_board_info info = {};
		const u32 *addr;
		int len;

		addr = of_get_property(node, "reg", &len);
		if (!addr \|\| len < sizeof(int) \|\| *addr > (1 << 10) - 1) {
		printk(KERN_ERR
		"of-i2c: invalid i2c device entry\n");
		continue;
		}

		info.irq = irq_of_parse_and_map(node, 0);
		if (info.irq == NO_IRQ)
		info.irq = -1;

		if (of_find_i2c_driver(node, &info) < 0) {
		irq_dispose_mapping(info.irq);
		continue;
		}

		info.addr = *addr;

		request_module(info.type);

		result = i2c_new_device(adap, &info);
		if (result == NULL) {
		printk(KERN_ERR
		"of-i2c: Failed to load driver for %s\n",
		info.type);
		irq_dispose_mapping(info.irq);
		continue;
		}
		}
		}
		EXPORT_SYMBOL(of_register_i2c_devices);

include/linux/of_i2c.h

0 → 100644

+24 −0

Original line number	Diff line number	Diff line
		/*
		* Generic I2C API implementation for PowerPC.
		*
		* Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*/

		#ifndef __LINUX_OF_I2C_H
		#define __LINUX_OF_I2C_H

		#include <linux/i2c.h>

		#ifdef CONFIG_OF_I2C

		void of_register_i2c_devices(struct i2c_adapter *adap,
		struct device_node *adap_node);

		#endif /* CONFIG_OF_I2C */

		#endif /* __LINUX_OF_I2C_H */

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