From: Wolfram Sang <wsa+rene...@sang-engineering.com>
Something simple to show and explain at ELCE15. Not for inclusion!
Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
---
As promised, here is the driver from my talk. Educational only!
drivers/i2c/Kconfig | 3 ++
drivers/i2c/Makefile | 1 +
drivers/i2c/i2c-slave-8bitseccnt.c | 66 ++++++++++++++++++++++++++++++++++++++
3 files changed, 70 insertions(+)
create mode 100644 drivers/i2c/i2c-slave-8bitseccnt.c
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 78fbee46362828..c43e00e88b86a3 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -118,6 +118,9 @@ if I2C_SLAVE
config I2C_SLAVE_EEPROM
tristate "I2C eeprom slave driver"
+config I2C_SLAVE_8BIT_SEC_CNT
+ tristate "I2C 8 bit second counter slave driver"
+
endif
config I2C_DEBUG_CORE
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 45095b3d16a914..19e8be1020865a 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
obj-$(CONFIG_I2C_MUX) += i2c-mux.o
obj-y += algos/ busses/ muxes/
obj-$(CONFIG_I2C_STUB) += i2c-stub.o
+obj-$(CONFIG_I2C_SLAVE_8BIT_SEC_CNT) += i2c-slave-8bitseccnt.o
obj-$(CONFIG_I2C_SLAVE_EEPROM) += i2c-slave-eeprom.o
ccflags-$(CONFIG_I2C_DEBUG_CORE) := -DDEBUG
diff --git a/drivers/i2c/i2c-slave-8bitseccnt.c
b/drivers/i2c/i2c-slave-8bitseccnt.c
new file mode 100644
index 00000000000000..6049989523de6c
--- /dev/null
+++ b/drivers/i2c/i2c-slave-8bitseccnt.c
@@ -0,0 +1,66 @@
+/*
+ * I2C slave mode 8 bit seconds counter backend :)
+ *
+ * Copyright (C) 2015 by Wolfram Sang, Sang Engineering
<w...@sang-engineering.com>
+ * Copyright (C) 2015 by Renesas Electronics Corporation
+ *
+ * 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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/timekeeping.h>
+
+static int i2c_slave_8bit_seconds_slave_cb(struct i2c_client *client,
+ enum i2c_slave_event event, u8 *val)
+{
+ switch (event) {
+ case I2C_SLAVE_READ_REQUESTED:
+ case I2C_SLAVE_READ_PROCESSED:
+ /* Always get the most recent value */
+ *val = get_seconds() & 0xff;
+ break;
+
+ case I2C_SLAVE_WRITE_REQUESTED:
+ case I2C_SLAVE_WRITE_RECEIVED:
+ case I2C_SLAVE_STOP:
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int i2c_slave_8bit_seconds_probe(struct i2c_client *client, const
struct i2c_device_id *id)
+{
+ return i2c_slave_register(client, i2c_slave_8bit_seconds_slave_cb);
+};
+
+static int i2c_slave_8bit_seconds_remove(struct i2c_client *client)
+{
+ i2c_slave_unregister(client);
+ return 0;
+}
+
+static const struct i2c_device_id i2c_slave_8bit_seconds_id[] = {
+ { "slave-8bit_seconds", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, i2c_slave_8bit_seconds_id);
+
+static struct i2c_driver i2c_slave_8bit_seconds_driver = {
+ .driver = {
+ .name = "i2c-slave-8bit_seconds",
+ },
+ .probe = i2c_slave_8bit_seconds_probe,
+ .remove = i2c_slave_8bit_seconds_remove,
+ .id_table = i2c_slave_8bit_seconds_id,
+};
+module_i2c_driver(i2c_slave_8bit_seconds_driver);
+
+MODULE_AUTHOR("Wolfram Sang <w...@sang-engineering.com>");
+MODULE_DESCRIPTION("I2C slave mode 8 bit seconds counter backend");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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