[linux-2.6-block.git] / arch / arm / plat-omap / i2c.c

/*
 * linux/arch/arm/plat-omap/i2c.c
 *
 * Helper module for board specific I2C bus registration
 *
 * Copyright (C) 2007 Nokia Corporation.
 *
 * Contact: Jarkko Nikula <jhnikula@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/i2c-omap.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>

#include <plat/i2c.h>

#define OMAP_I2C_MAX_CONTROLLERS 4
static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];

#define OMAP_I2C_CMDLINE_SETUP	(BIT(31))

/**
 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
 * @str: String of options
 *
 * This function allow to override the default I2C bus speed for given I2C
 * bus with a command line option.
 *
 * Format: i2c_bus=bus_id,clkrate (in kHz)
 *
 * Returns 1 on success, 0 otherwise.
 */
static int __init omap_i2c_bus_setup(char *str)
{
	int ints[3];

	get_options(str, 3, ints);
	if (ints[0] < 2 || ints[1] < 1 ||
			ints[1] > OMAP_I2C_MAX_CONTROLLERS)
		return 0;
	i2c_pdata[ints[1] - 1].clkrate = ints[2];
	i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;

	return 1;
}
__setup("i2c_bus=", omap_i2c_bus_setup);

/*
 * Register busses defined in command line but that are not registered with
 * omap_register_i2c_bus from board initialization code.
 */
int __init omap_register_i2c_bus_cmdline(void)
{
	int i, err = 0;

	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
		if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
			i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
			err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
			if (err)
				goto out;
		}

out:
	return err;
}

/**
 * omap_register_i2c_bus - register I2C bus with device descriptors
 * @bus_id: bus id counting from number 1
 * @clkrate: clock rate of the bus in kHz
 * @info: pointer into I2C device descriptor table or NULL
 * @len: number of descriptors in the table
 *
 * Returns 0 on success or an error code.
 */
int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
			  struct i2c_board_info const *info,
			  unsigned len)
{
	int err;

	BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);

	if (info) {
		err = i2c_register_board_info(bus_id, info, len);
		if (err)
			return err;
	}

	if (!i2c_pdata[bus_id - 1].clkrate)
		i2c_pdata[bus_id - 1].clkrate = clkrate;

	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;

	return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
}
Commit	Line	Data
85d05fb3 JN	1	/*
	2	* linux/arch/arm/plat-omap/i2c.c
	3	*
	4	* Helper module for board specific I2C bus registration
	5	*
	6	* Copyright (C) 2007 Nokia Corporation.
	7	*
ddf25dfe	8	* Contact: Jarkko Nikula <jhnikula@gmail.com>
85d05fb3 JN	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* version 2 as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	22	* 02110-1301 USA
	23	*
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/i2c.h>
3a8761c0	29	#include <linux/i2c-omap.h>
4d17aeb1 PW	30	#include <linux/slab.h>
	31	#include <linux/err.h>
	32	#include <linux/clk.h>
20c9d2c4	33
01480bad	34	#include <plat/i2c.h>
e4c060db	35
4d17aeb1 PW	36	#define OMAP_I2C_MAX_CONTROLLERS 4
4d17aeb1 PW	37	static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
85d05fb3	38
7954763b JN	39	#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
7954763b JN	40
3a853fb9 JN	41	/**
	42	* omap_i2c_bus_setup - Process command line options for the I2C bus speed
	43	* @str: String of options
	44	*
	45	* This function allow to override the default I2C bus speed for given I2C
	46	* bus with a command line option.
	47	*
	48	* Format: i2c_bus=bus_id,clkrate (in kHz)
	49	*
	50	* Returns 1 on success, 0 otherwise.
	51	*/
	52	static int __init omap_i2c_bus_setup(char *str)
	53	{
3a853fb9 JN	54	int ints[3];
3a853fb9 JN	55
3a853fb9	56	get_options(str, 3, ints);
c34f7c69 TL	57	if (ints[0] < 2 \|\| ints[1] < 1 \|\|
c34f7c69 TL	58	ints[1] > OMAP_I2C_MAX_CONTROLLERS)
3a853fb9	59	return 0;
20c9d2c4 KJ	60	i2c_pdata[ints[1] - 1].clkrate = ints[2];
20c9d2c4 KJ	61	i2c_pdata[ints[1] - 1].clkrate \|= OMAP_I2C_CMDLINE_SETUP;
3a853fb9 JN	62
	63	return 1;
	64	}
	65	__setup("i2c_bus=", omap_i2c_bus_setup);
	66
7954763b JN	67	/*
	68	* Register busses defined in command line but that are not registered with
	69	* omap_register_i2c_bus from board initialization code.
	70	*/
a6cf912c	71	int __init omap_register_i2c_bus_cmdline(void)
7954763b JN	72	{
	73	int i, err = 0;
	74
20c9d2c4 KJ	75	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
	76	if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
	77	i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
3a8761c0	78	err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
7954763b JN	79	if (err)
	80	goto out;
	81	}
	82
	83	out:
	84	return err;
	85	}
7954763b	86
d4c58bf4	87	/**
9833eff3	88	* omap_register_i2c_bus - register I2C bus with device descriptors
d4c58bf4 JN	89	* @bus_id: bus id counting from number 1
	90	* @clkrate: clock rate of the bus in kHz
	91	* @info: pointer into I2C device descriptor table or NULL
	92	* @len: number of descriptors in the table
	93	*
	94	* Returns 0 on success or an error code.
	95	*/
9833eff3	96	int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
85d05fb3 JN	97	struct i2c_board_info const *info,
	98	unsigned len)
	99	{
3a853fb9	100	int err;
85d05fb3	101
c34f7c69	102	BUG_ON(bus_id < 1 \|\| bus_id > OMAP_I2C_MAX_CONTROLLERS);
85d05fb3 JN	103
	104	if (info) {
	105	err = i2c_register_board_info(bus_id, info, len);
	106	if (err)
	107	return err;
	108	}
	109
20c9d2c4 KJ	110	if (!i2c_pdata[bus_id - 1].clkrate)
	111	i2c_pdata[bus_id - 1].clkrate = clkrate;
	112
	113	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
85d05fb3	114
3a8761c0	115	return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
85d05fb3	116	}