Implement the I2C control interface for the WM8350. This code was
originally written by Liam Girdwood and has been updated for submission
by Mark Brown.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
drivers/mfd/Kconfig | 11 ++++
drivers/mfd/Makefile | 1 +
drivers/mfd/wm8350-i2c.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 132 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/wm8350-i2c.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index c32d676..b2930cc 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -133,6 +133,17 @@ config MFD_WM8350_CONFIG_MODE_3
If unsure say Y
+config MFD_WM8350_I2C
+ tristate "Support Wolfson Microelectronics WM8350 with I2C"
+ select MFD_WM8350
+ depends on I2C
+ help
+ The WM8350 is an integrated audio and power management
+ subsystem with watchdog and RTC functionality for embedded
+ systems. This option enables core support for the WM8350 with
+ I2C as the control interface. Additional options must be
+ selected to enable support for the functionality of the chip.
+
endmenu
menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b0adca0..746d37b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_MFD_TC6393XB) += tc6393xb.o
obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
wm8350-objs := wm8350-core.o wm8350-regmap.o
obj-$(CONFIG_MFD_WM8350) += wm8350.o
+obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
obj-$(CONFIG_MFD_CORE) += mfd-core.o
diff --git a/drivers/mfd/wm8350-i2c.c b/drivers/mfd/wm8350-i2c.c
new file mode 100644
index 0000000..2b0569c
--- /dev/null
+++ b/drivers/mfd/wm8350-i2c.c
@@ -0,0 +1,120 @@
+/*
+ * wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
+ *
+ * This driver defines and configures the WM8350 for the Freescale i.MX32ADS.
+ *
+ * Copyright 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ * Author: Liam Girdwood
+ * linux@wolfsonmicro.com
+ *
+ * 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, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/wm8350/core.h>
+
+static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
+ int bytes, void *dest)
+{
+ int ret;
+
+ ret = i2c_master_send(wm8350->i2c_client, ®, 1);
+ if (ret < 0)
+ return ret;
+ return i2c_master_recv(wm8350->i2c_client, dest, bytes);
+}
+
+static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
+ int bytes, void *src)
+{
+ /* we add 1 byte for device register */
+ u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
+
+ if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
+ return -EINVAL;
+
+ msg[0] = reg;
+ memcpy(&msg[1], src, bytes);
+ return i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
+}
+
+static int wm8350_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct wm8350 *wm8350;
+ int ret = 0;
+
+ wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
+ if (wm8350 == NULL) {
+ kfree(i2c);
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(i2c, wm8350);
+ wm8350->dev = &i2c->dev;
+ wm8350->i2c_client = i2c;
+ wm8350->read_dev = wm8350_i2c_read_device;
+ wm8350->write_dev = wm8350_i2c_write_device;
+
+ ret = wm8350_device_init(wm8350);
+ if (ret < 0)
+ goto err;
+
+ return ret;
+
+err:
+ kfree(wm8350);
+ return ret;
+}
+
+static int wm8350_i2c_remove(struct i2c_client *i2c)
+{
+ struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
+
+ wm8350_device_exit(wm8350);
+ kfree(wm8350);
+
+ return 0;
+}
+
+static const struct i2c_device_id wm8350_i2c_id[] = {
+ { "wm8350", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
+
+
+static struct i2c_driver wm8350_i2c_driver = {
+ .driver = {
+ .name = "wm8350",
+ .owner = THIS_MODULE,
+ },
+ .probe = wm8350_i2c_probe,
+ .remove = wm8350_i2c_remove,
+ .id_table = wm8350_i2c_id,
+};
+
+static int __init wm8350_i2c_init(void)
+{
+ return i2c_add_driver(&wm8350_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(wm8350_i2c_init);
+
+static void __exit wm8350_i2c_exit(void)
+{
+ i2c_del_driver(&wm8350_i2c_driver);
+}
+module_exit(wm8350_i2c_exit);
+
+MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
+MODULE_LICENSE("GPL");
--
1.5.6.5
--
