mfd: Add I2C control support for WM8350
Mark Brown [Fri, 10 Oct 2008 14:58:11 +0000 (15:58 +0100)]
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>
Acked-by: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/mfd/Kconfig
drivers/mfd/Makefile
drivers/mfd/wm8350-i2c.c [new file with mode: 0644]

index 5d7bbf4..5eff8ad 100644 (file)
@@ -114,6 +114,17 @@ config MFD_WM8350_CONFIG_MODE_3
        bool
        depends on MFD_WM8350
 
+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"
index bec1e92..45038ae 100644 (file)
@@ -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 (file)
index 0000000..2b0569c
--- /dev/null
@@ -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, &reg, 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");