--- /dev/null
+/*
+ * 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/config.h>
+#ifdef CONFIG_I2C_DEBUG_BUS
+#define DEBUG 1
+#endif
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/hardware.h> /* Pick up IXP42000-specific bits */
+
+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 device *dev)
+{
+ struct platform_device *plat_dev = to_platform_device(dev);
+ struct ixp2000_i2c_data *drv_data = dev_get_drvdata(&plat_dev->dev);
+
+ dev_set_drvdata(&plat_dev->dev, NULL);
+
+ i2c_bit_del_bus(&drv_data->adapter);
+
+ kfree(drv_data);
+
+ return 0;
+}
+
+static int ixp2000_i2c_probe(struct device *dev)
+{
+ int err;
+ struct platform_device *plat_dev = to_platform_device(dev);
+ struct ixp2000_i2c_pins *gpio = plat_dev->dev.platform_data;
+ struct ixp2000_i2c_data *drv_data =
+ kmalloc(sizeof(struct ixp2000_i2c_data), GFP_KERNEL);
+
+ if (!drv_data)
+ return -ENOMEM;
+ memzero(drv_data, sizeof(*drv_data));
+ 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.mdelay = 6;
+ drv_data->algo_data.timeout = 100;
+
+ drv_data->adapter.id = I2C_HW_B_IXP2000,
+ 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(dev, "Could not install, error %d\n", err);
+ kfree(drv_data);
+ return err;
+ }
+
+ dev_set_drvdata(&plat_dev->dev, drv_data);
+
+ return 0;
+}
+
+static struct device_driver ixp2000_i2c_driver = {
+ .name = "IXP2000-I2C",
+ .bus = &platform_bus_type,
+ .probe = ixp2000_i2c_probe,
+ .remove = ixp2000_i2c_remove,
+};
+
+static int __init ixp2000_i2c_init(void)
+{
+ return driver_register(&ixp2000_i2c_driver);
+}
+
+static void __exit ixp2000_i2c_exit(void)
+{
+ 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");
+
git://git.onelab.eu / linux-2.6.git / blobdiff