diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-ixp2000.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ixp2000.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/drivers/i2c/busses/i2c-ixp2000.c b/drivers/i2c/busses/i2c-ixp2000.c deleted file mode 100644 index 5d8aed5ec21..00000000000 --- a/drivers/i2c/busses/i2c-ixp2000.c +++ /dev/null @@ -1,168 +0,0 @@ -/* - * drivers/i2c/busses/i2c-ixp2000.c - * - * I2C adapter for IXP2000 systems using GPIOs for I2C bus - * - * Author: Deepak Saxena <dsaxena@plexity.net> - * Based on IXDP2400 code by: Naeem M. Afzal <naeem.m.afzal@intel.com> - * Made generic by: Jeff Daly <jeffrey.daly@intel.com> - * - * Copyright (c) 2003-2004 MontaVista Software Inc. - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - * - * From Jeff Daly: - * - * I2C adapter driver for Intel IXDP2xxx platforms. This should work for any - * IXP2000 platform if it uses the HW GPIO in the same manner. Basically, - * SDA and SCL GPIOs have external pullups. Setting the respective GPIO to - * an input will make the signal a '1' via the pullup. Setting them to - * outputs will pull them down. - * - * The GPIOs are open drain signals and are used as configuration strap inputs - * during power-up so there's generally a buffer on the board that needs to be - * 'enabled' to drive the GPIOs. - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/module.h> -#include <linux/i2c.h> -#include <linux/i2c-algo-bit.h> -#include <linux/slab.h> - -#include <mach/hardware.h> /* Pick up IXP2000-specific bits */ -#include <mach/gpio.h> - -static inline int ixp2000_scl_pin(void *data) -{ - return ((struct ixp2000_i2c_pins*)data)->scl_pin; -} - -static inline int ixp2000_sda_pin(void *data) -{ - return ((struct ixp2000_i2c_pins*)data)->sda_pin; -} - - -static void ixp2000_bit_setscl(void *data, int val) -{ - int i = 5000; - - if (val) { - gpio_line_config(ixp2000_scl_pin(data), GPIO_IN); - while(!gpio_line_get(ixp2000_scl_pin(data)) && i--); - } else { - gpio_line_config(ixp2000_scl_pin(data), GPIO_OUT); - } -} - -static void ixp2000_bit_setsda(void *data, int val) -{ - if (val) { - gpio_line_config(ixp2000_sda_pin(data), GPIO_IN); - } else { - gpio_line_config(ixp2000_sda_pin(data), GPIO_OUT); - } -} - -static int ixp2000_bit_getscl(void *data) -{ - return gpio_line_get(ixp2000_scl_pin(data)); -} - -static int ixp2000_bit_getsda(void *data) -{ - return gpio_line_get(ixp2000_sda_pin(data)); -} - -struct ixp2000_i2c_data { - struct ixp2000_i2c_pins *gpio_pins; - struct i2c_adapter adapter; - struct i2c_algo_bit_data algo_data; -}; - -static int ixp2000_i2c_remove(struct platform_device *plat_dev) -{ - struct ixp2000_i2c_data *drv_data = platform_get_drvdata(plat_dev); - - platform_set_drvdata(plat_dev, NULL); - - i2c_del_adapter(&drv_data->adapter); - - kfree(drv_data); - - return 0; -} - -static int ixp2000_i2c_probe(struct platform_device *plat_dev) -{ - int err; - struct ixp2000_i2c_pins *gpio = plat_dev->dev.platform_data; - struct ixp2000_i2c_data *drv_data = - kzalloc(sizeof(struct ixp2000_i2c_data), GFP_KERNEL); - - if (!drv_data) - return -ENOMEM; - drv_data->gpio_pins = gpio; - - drv_data->algo_data.data = gpio; - drv_data->algo_data.setsda = ixp2000_bit_setsda; - drv_data->algo_data.setscl = ixp2000_bit_setscl; - drv_data->algo_data.getsda = ixp2000_bit_getsda; - drv_data->algo_data.getscl = ixp2000_bit_getscl; - drv_data->algo_data.udelay = 6; - drv_data->algo_data.timeout = HZ; - - strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name, - sizeof(drv_data->adapter.name)); - drv_data->adapter.algo_data = &drv_data->algo_data, - - drv_data->adapter.dev.parent = &plat_dev->dev; - - gpio_line_config(gpio->sda_pin, GPIO_IN); - gpio_line_config(gpio->scl_pin, GPIO_IN); - gpio_line_set(gpio->scl_pin, 0); - gpio_line_set(gpio->sda_pin, 0); - - if ((err = i2c_bit_add_bus(&drv_data->adapter)) != 0) { - dev_err(&plat_dev->dev, "Could not install, error %d\n", err); - kfree(drv_data); - return err; - } - - platform_set_drvdata(plat_dev, drv_data); - - return 0; -} - -static struct platform_driver ixp2000_i2c_driver = { - .probe = ixp2000_i2c_probe, - .remove = ixp2000_i2c_remove, - .driver = { - .name = "IXP2000-I2C", - .owner = THIS_MODULE, - }, -}; - -static int __init ixp2000_i2c_init(void) -{ - return platform_driver_register(&ixp2000_i2c_driver); -} - -static void __exit ixp2000_i2c_exit(void) -{ - platform_driver_unregister(&ixp2000_i2c_driver); -} - -module_init(ixp2000_i2c_init); -module_exit(ixp2000_i2c_exit); - -MODULE_AUTHOR ("Deepak Saxena <dsaxena@plexity.net>"); -MODULE_DESCRIPTION("IXP2000 GPIO-based I2C bus driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:IXP2000-I2C"); - |