diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-ixp4xx.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ixp4xx.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/drivers/i2c/busses/i2c-ixp4xx.c b/drivers/i2c/busses/i2c-ixp4xx.c deleted file mode 100644 index 069ed7f3b39..00000000000 --- a/drivers/i2c/busses/i2c-ixp4xx.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * drivers/i2c/busses/i2c-ixp4xx.c - * - * Intel's IXP4xx XScale NPU chipsets (IXP420, 421, 422, 425) do not have - * an on board I2C controller but provide 16 GPIO pins that are often - * used to create an I2C bus. This driver provides an i2c_adapter - * interface that plugs in under algo_bit and drives the GPIO pins - * as instructed by the alogorithm driver. - * - * Author: Deepak Saxena <dsaxena@plexity.net> - * - * 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. - * - * NOTE: Since different platforms will use different GPIO pins for - * I2C, this driver uses an IXP4xx-specific platform_data - * pointer to pass the GPIO numbers to the driver. This - * allows us to support all the different IXP4xx platforms - * w/o having to put #ifdefs in this driver. - * - * See arch/arm/mach-ixp4xx/ixdp425.c for an example of building a - * device list and filling in the ixp4xx_i2c_pins data structure - * that is passed as the platform_data to this driver. - */ - -#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 <asm/hardware.h> /* Pick up IXP4xx-specific bits */ - -static inline int ixp4xx_scl_pin(void *data) -{ - return ((struct ixp4xx_i2c_pins*)data)->scl_pin; -} - -static inline int ixp4xx_sda_pin(void *data) -{ - return ((struct ixp4xx_i2c_pins*)data)->sda_pin; -} - -static void ixp4xx_bit_setscl(void *data, int val) -{ - gpio_line_set(ixp4xx_scl_pin(data), 0); - gpio_line_config(ixp4xx_scl_pin(data), - val ? IXP4XX_GPIO_IN : IXP4XX_GPIO_OUT ); -} - -static void ixp4xx_bit_setsda(void *data, int val) -{ - gpio_line_set(ixp4xx_sda_pin(data), 0); - gpio_line_config(ixp4xx_sda_pin(data), - val ? IXP4XX_GPIO_IN : IXP4XX_GPIO_OUT ); -} - -static int ixp4xx_bit_getscl(void *data) -{ - int scl; - - gpio_line_config(ixp4xx_scl_pin(data), IXP4XX_GPIO_IN ); - gpio_line_get(ixp4xx_scl_pin(data), &scl); - - return scl; -} - -static int ixp4xx_bit_getsda(void *data) -{ - int sda; - - gpio_line_config(ixp4xx_sda_pin(data), IXP4XX_GPIO_IN ); - gpio_line_get(ixp4xx_sda_pin(data), &sda); - - return sda; -} - -struct ixp4xx_i2c_data { - struct ixp4xx_i2c_pins *gpio_pins; - struct i2c_adapter adapter; - struct i2c_algo_bit_data algo_data; -}; - -static int ixp4xx_i2c_remove(struct platform_device *plat_dev) -{ - struct ixp4xx_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 ixp4xx_i2c_probe(struct platform_device *plat_dev) -{ - int err; - struct ixp4xx_i2c_pins *gpio = plat_dev->dev.platform_data; - struct ixp4xx_i2c_data *drv_data = - kzalloc(sizeof(struct ixp4xx_i2c_data), GFP_KERNEL); - - if(!drv_data) - return -ENOMEM; - - drv_data->gpio_pins = gpio; - - /* - * We could make a lot of these structures static, but - * certain platforms may have multiple GPIO-based I2C - * buses for various device domains, so we need per-device - * algo_data->data. - */ - drv_data->algo_data.data = gpio; - drv_data->algo_data.setsda = ixp4xx_bit_setsda; - drv_data->algo_data.setscl = ixp4xx_bit_setscl; - drv_data->algo_data.getsda = ixp4xx_bit_getsda; - drv_data->algo_data.getscl = ixp4xx_bit_getscl; - drv_data->algo_data.udelay = 10; - drv_data->algo_data.timeout = 100; - - drv_data->adapter.id = I2C_HW_B_IXP4XX; - drv_data->adapter.class = I2C_CLASS_HWMON; - 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->scl_pin, IXP4XX_GPIO_IN); - gpio_line_config(gpio->sda_pin, IXP4XX_GPIO_IN); - gpio_line_set(gpio->scl_pin, 0); - gpio_line_set(gpio->sda_pin, 0); - - err = i2c_bit_add_bus(&drv_data->adapter); - if (err) { - printk(KERN_ERR "ERROR: Could not install %s\n", plat_dev->dev.bus_id); - - kfree(drv_data); - return err; - } - - platform_set_drvdata(plat_dev, drv_data); - - return 0; -} - -static struct platform_driver ixp4xx_i2c_driver = { - .probe = ixp4xx_i2c_probe, - .remove = ixp4xx_i2c_remove, - .driver = { - .name = "IXP4XX-I2C", - .owner = THIS_MODULE, - }, -}; - -static int __init ixp4xx_i2c_init(void) -{ - return platform_driver_register(&ixp4xx_i2c_driver); -} - -static void __exit ixp4xx_i2c_exit(void) -{ - platform_driver_unregister(&ixp4xx_i2c_driver); -} - -module_init(ixp4xx_i2c_init); -module_exit(ixp4xx_i2c_exit); - -MODULE_DESCRIPTION("GPIO-based I2C adapter for IXP4xx systems"); -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); - |