a0d9c63d36
i2c-algo-bit: Discard the mdelay data struct member The i2c_algo_bit_data structure has an mdelay member, which is not used by the algorithm code (the code has always been ifdef'd out.) Let's discard it to save some code and memory. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* linux/drivers/i2c/scx200_i2c.c
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Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
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National Semiconductor SCx200 I2C bus on GPIO pins
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Based on i2c-velleman.c Copyright (C) 1995-96, 2000 Simon G. Vogl
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/io.h>
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#include <linux/scx200_gpio.h>
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#define NAME "scx200_i2c"
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MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
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MODULE_DESCRIPTION("NatSemi SCx200 I2C Driver");
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MODULE_LICENSE("GPL");
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static int scl = CONFIG_SCx200_I2C_SCL;
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static int sda = CONFIG_SCx200_I2C_SDA;
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module_param(scl, int, 0);
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MODULE_PARM_DESC(scl, "GPIO line for SCL");
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module_param(sda, int, 0);
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MODULE_PARM_DESC(sda, "GPIO line for SDA");
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static void scx200_i2c_setscl(void *data, int state)
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{
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scx200_gpio_set(scl, state);
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}
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static void scx200_i2c_setsda(void *data, int state)
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{
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scx200_gpio_set(sda, state);
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}
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static int scx200_i2c_getscl(void *data)
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{
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return scx200_gpio_get(scl);
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}
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static int scx200_i2c_getsda(void *data)
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{
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return scx200_gpio_get(sda);
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}
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/* ------------------------------------------------------------------------
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* Encapsulate the above functions in the correct operations structure.
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* This is only done when more than one hardware adapter is supported.
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*/
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static struct i2c_algo_bit_data scx200_i2c_data = {
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.setsda = scx200_i2c_setsda,
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.setscl = scx200_i2c_setscl,
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.getsda = scx200_i2c_getsda,
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.getscl = scx200_i2c_getscl,
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.udelay = 10,
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.timeout = 100,
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};
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static struct i2c_adapter scx200_i2c_ops = {
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.owner = THIS_MODULE,
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.algo_data = &scx200_i2c_data,
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.name = "NatSemi SCx200 I2C",
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};
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static int scx200_i2c_init(void)
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{
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pr_debug(NAME ": NatSemi SCx200 I2C Driver\n");
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if (!scx200_gpio_present()) {
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printk(KERN_ERR NAME ": no SCx200 gpio pins available\n");
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return -ENODEV;
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}
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pr_debug(NAME ": SCL=GPIO%02u, SDA=GPIO%02u\n", scl, sda);
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if (scl == -1 || sda == -1 || scl == sda) {
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printk(KERN_ERR NAME ": scl and sda must be specified\n");
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return -EINVAL;
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}
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/* Configure GPIOs as open collector outputs */
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scx200_gpio_configure(scl, ~2, 5);
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scx200_gpio_configure(sda, ~2, 5);
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if (i2c_bit_add_bus(&scx200_i2c_ops) < 0) {
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printk(KERN_ERR NAME ": adapter %s registration failed\n",
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scx200_i2c_ops.name);
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return -ENODEV;
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}
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return 0;
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}
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static void scx200_i2c_cleanup(void)
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{
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i2c_bit_del_bus(&scx200_i2c_ops);
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}
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module_init(scx200_i2c_init);
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module_exit(scx200_i2c_cleanup);
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/*
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Local variables:
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compile-command: "make -k -C ../.. SUBDIRS=drivers/i2c modules"
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c-basic-offset: 8
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End:
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*/
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