zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-ixp2000.c b/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-ixp2000.c
new file mode 100644
index 0000000..5d263f9
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-ixp2000.c
@@ -0,0 +1,157 @@
+/*
+ * 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-ixp2000.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,
+ },
+};
+
+module_platform_driver(ixp2000_i2c_driver);
+
+MODULE_AUTHOR ("Deepak Saxena <dsaxena@plexity.net>");
+MODULE_DESCRIPTION("IXP2000 GPIO-based I2C bus driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:IXP2000-I2C");
+