Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bcda9f1eb0de0e1108c8b2765e5b7afa0dfb6c9f
Commit: bcda9f1eb0de0e1108c8b2765e5b7afa0dfb6c9f
Parent: 1c23af90dc44d05bbb6a3b5246ab664b1f943943
Author: Ben Dooks <[EMAIL PROTECTED]>
AuthorDate: Tue May 1 23:26:34 2007 +0200
Committer: Jean Delvare <[EMAIL PROTECTED]>
CommitDate: Tue May 1 23:26:34 2007 +0200
i2c: New Simtec I2C bus driver
Platform driver for the Simtec CPLD based simple I2C logic.
Signed-off-by: Ben Dooks <[EMAIL PROTECTED]>
Signed-off-by: Jean Delvare <[EMAIL PROTECTED]>
---
drivers/i2c/busses/Kconfig | 12 +++
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-simtec.c | 186 +++++++++++++++++++++++++++++++++++++++
3 files changed, 199 insertions(+), 0 deletions(-)
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 33a8a67..2178c9b 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -413,6 +413,18 @@ config I2C_SIBYTE
help
Supports the SiByte SOC on-chip I2C interfaces (2 channels).
+config I2C_SIMTEC
+ tristate "Simtec Generic I2C interface"
+ select I2C_ALGOBIT
+ help
+ If you say yes to this option, support will be inclyded for
+ the Simtec Generic I2C interface. This driver is for the
+ simple I2C bus used on newer Simtec products for general
+ I2C, such as DDC on the Simtec BBD2016A.
+
+ This driver can also be build as a module. If so, the module
+ will be called i2c-simtec.
+
config SCx200_I2C
tristate "NatSemi SCx200 I2C using GPIO pins"
depends on SCx200_GPIO
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 5689165..3a020ea 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_I2C_RPXLITE) += i2c-rpx.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
obj-$(CONFIG_I2C_SAVAGE4) += i2c-savage4.o
obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
+obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
obj-$(CONFIG_I2C_SIS5595) += i2c-sis5595.o
obj-$(CONFIG_I2C_SIS630) += i2c-sis630.o
obj-$(CONFIG_I2C_SIS96X) += i2c-sis96x.o
diff --git a/drivers/i2c/busses/i2c-simtec.c b/drivers/i2c/busses/i2c-simtec.c
new file mode 100644
index 0000000..10af8d3
--- /dev/null
+++ b/drivers/i2c/busses/i2c-simtec.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2005 Simtec Electronics
+ * Ben Dooks <[EMAIL PROTECTED]>
+ *
+ * Simtec Generic I2C Controller
+ *
+ * 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; either 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/io.h>
+
+struct simtec_i2c_data {
+ struct resource *ioarea;
+ void __iomem *reg;
+ struct i2c_adapter adap;
+ struct i2c_algo_bit_data bit;
+};
+
+#define CMD_SET_SDA (1<<2)
+#define CMD_SET_SCL (1<<3)
+
+#define STATE_SDA (1<<0)
+#define STATE_SCL (1<<1)
+
+/* i2c bit-bus functions */
+
+static void simtec_i2c_setsda(void *pw, int state)
+{
+ struct simtec_i2c_data *pd = pw;
+ writeb(CMD_SET_SDA | (state ? STATE_SDA : 0), pd->reg);
+}
+
+static void simtec_i2c_setscl(void *pw, int state)
+{
+ struct simtec_i2c_data *pd = pw;
+ writeb(CMD_SET_SCL | (state ? STATE_SCL : 0), pd->reg);
+}
+
+static int simtec_i2c_getsda(void *pw)
+{
+ struct simtec_i2c_data *pd = pw;
+ return readb(pd->reg) & STATE_SDA ? 1 : 0;
+}
+
+static int simtec_i2c_getscl(void *pw)
+{
+ struct simtec_i2c_data *pd = pw;
+ return readb(pd->reg) & STATE_SCL ? 1 : 0;
+}
+
+/* device registration */
+
+static int simtec_i2c_probe(struct platform_device *dev)
+{
+ struct simtec_i2c_data *pd;
+ struct resource *res;
+ int size;
+ int ret;
+
+ pd = kzalloc(sizeof(struct simtec_i2c_data), GFP_KERNEL);
+ if (pd == NULL) {
+ dev_err(&dev->dev, "cannot allocate private data\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(dev, pd);
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&dev->dev, "cannot find IO resource\n");
+ ret = -ENOENT;
+ goto err;
+ }
+
+ size = (res->end-res->start)+1;
+
+ pd->ioarea = request_mem_region(res->start, size, dev->name);
+ if (pd->ioarea == NULL) {
+ dev_err(&dev->dev, "cannot request IO\n");
+ ret = -ENXIO;
+ goto err;
+ }
+
+ pd->reg = ioremap(res->start, size);
+ if (pd->reg == NULL) {
+ dev_err(&dev->dev, "cannot map IO\n");
+ ret = -ENXIO;
+ goto err_res;
+ }
+
+ /* setup the private data */
+
+ pd->adap.owner = THIS_MODULE;
+ pd->adap.algo_data = &pd->bit;
+ pd->adap.dev.parent = &dev->dev;
+
+ strlcpy(pd->adap.name, "Simtec I2C", sizeof(pd->adap.name));
+
+ pd->bit.data = pd;
+ pd->bit.setsda = simtec_i2c_setsda;
+ pd->bit.setscl = simtec_i2c_setscl;
+ pd->bit.getsda = simtec_i2c_getsda;
+ pd->bit.getscl = simtec_i2c_getscl;
+ pd->bit.timeout = HZ;
+ pd->bit.udelay = 20;
+
+ ret = i2c_bit_add_bus(&pd->adap);
+ if (ret)
+ goto err_all;
+
+ return 0;
+
+ err_all:
+ iounmap(pd->reg);
+
+ err_res:
+ release_resource(pd->ioarea);
+ kfree(pd->ioarea);
+
+ err:
+ kfree(pd);
+ return ret;
+}
+
+static int simtec_i2c_remove(struct platform_device *dev)
+{
+ struct simtec_i2c_data *pd = platform_get_drvdata(dev);
+
+ i2c_del_adapter(&pd->adap);
+
+ iounmap(pd->reg);
+ release_resource(pd->ioarea);
+ kfree(pd->ioarea);
+ kfree(pd);
+
+ return 0;
+}
+
+
+/* device driver */
+
+static struct platform_driver simtec_i2c_driver = {
+ .driver = {
+ .name = "simtec-i2c",
+ .owner = THIS_MODULE,
+ },
+ .probe = simtec_i2c_probe,
+ .remove = simtec_i2c_remove,
+};
+
+static int __init i2c_adap_simtec_init(void)
+{
+ return platform_driver_register(&simtec_i2c_driver);
+}
+
+static void __exit i2c_adap_simtec_exit(void)
+{
+ platform_driver_unregister(&simtec_i2c_driver);
+}
+
+module_init(i2c_adap_simtec_init);
+module_exit(i2c_adap_simtec_exit);
+
+MODULE_DESCRIPTION("Simtec Generic I2C Bus driver");
+MODULE_AUTHOR("Ben Dooks <[EMAIL PROTECTED]>");
+MODULE_LICENSE("GPL");
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