>From 817d814ecae91862f42a0447f455dae7f74cba27 Mon Sep 17 00:00:00 2001
From: Zhang Rui <rui.zhang@xxxxxxxxx>
Date: Fri, 24 Aug 2012 15:20:38 +0800
Subject: [RFC PATCH 6/6] Introduce INT33B1 I2C controller driver
This is a dummy platform device driver to illustrate my idea about
how a really I2C controller should work on ACPI 5 platforms.
It just probes the INT33B1 I2C controller which is enumerated by ACPI.
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/i2c/busses/Kconfig | 8 +++
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-33b1.c | 117 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 126 insertions(+), 0 deletions(-)
create mode 100644 drivers/i2c/busses/i2c-33b1.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index b4aaa1b..536a19c 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -257,6 +257,14 @@ config I2C_SCMI
To compile this driver as a module, choose M here:
the module will be called i2c-scmi.
+config I2C_33B1
+ tristate "INT33B1 I2C controller"
+ help
+ This driver supports the ACPI enumerated INT33B1 I2C controller.
+
+ To compile this driver as a module, choose M here:
+ the module will be called i2c-scmi.
+
endif # ACPI
comment "Mac SMBus host controller drivers"
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index ce3c2be..8e478bd 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -4,6 +4,7 @@
# ACPI drivers
obj-$(CONFIG_I2C_SCMI) += i2c-scmi.o
+obj-$(CONFIG_I2C_33B1) += i2c-33b1.o
# PC SMBus host controller drivers
obj-$(CONFIG_I2C_ALI1535) += i2c-ali1535.o
diff --git a/drivers/i2c/busses/i2c-33b1.c b/drivers/i2c/busses/i2c-33b1.c
new file mode 100644
index 0000000..152c3e4
--- /dev/null
+++ b/drivers/i2c/busses/i2c-33b1.c
@@ -0,0 +1,117 @@
+/*
+ * i2c_33b1.c -INT33B1 i2c Controller Driver
+ *
+ * Copyright (c) 2012 Intel Corp
+ * Copyright (c) 2012 Zhang Rui <rui.zhang@xxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+
+struct int33b1_i2c_private {
+ struct i2c_adapter adap;
+ void __iomem *iobase;
+};
+
+
+static int int33b1_i2c_xfer(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num)
+{
+ return 0;
+}
+
+static u32 int33b1_func(struct i2c_adapter *adap)
+{
+ /* Emulate SMBUS over I2C */
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm int33b1_i2c_algo = {
+ .master_xfer = int33b1_i2c_xfer,
+ .functionality = int33b1_func,
+};
+
+static int __devinit int33b1_i2c_probe(struct platform_device *pdev)
+{
+ struct int33b1_i2c_private *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->iobase = devm_request_and_ioremap(&pdev->dev, res);
+ if (!priv->iobase) {
+ dev_err(&pdev->dev, "devm_request_and_ioremap failed\n");
+ return -EBUSY;
+ }
+
+ priv->adap.dev.parent = &pdev->dev;
+ priv->adap.owner = THIS_MODULE;
+ priv->adap.algo_data = priv;
+ priv->adap.algo = &int33b1_i2c_algo;
+ priv->adap.nr = pdev->id;
+ priv->adap.class = I2C_CLASS_HWMON;
+ snprintf(priv->adap.name, sizeof(priv->adap.name), "int33b1-i2c");
+
+ i2c_set_adapdata(&priv->adap, priv);
+ ret = i2c_add_numbered_adapter(&priv->adap);
+ if (ret < 0) {
+ dev_err(&priv->adap.dev, "Failed to add i2c bus.\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, priv);
+ dev_info(&priv->adap.dev, "Added I2C Bus.\n");
+ return 0;
+}
+
+static int __devexit int33b1_i2c_remove(struct platform_device *pdev)
+{
+ struct int33b1_i2c_private *priv;
+
+ priv = platform_get_drvdata(pdev);
+ i2c_del_adapter(&priv->adap);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver int33b1_i2c_driver = {
+ .probe = int33b1_i2c_probe,
+ .remove = __devexit_p(int33b1_i2c_remove),
+ .driver = {
+ .name = "int33b1-i2cbus",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(int33b1_i2c_driver);
+
+MODULE_AUTHOR("Zhang Rui <rui.zhang@xxxxxxxxx>");
+MODULE_DESCRIPTION("INT33B1 I2C Controller driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:INT33B1");
--
1.7.7.6
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