Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mfd / wm831x-spi.c

diff --git a/kernel/drivers/mfd/wm831x-spi.c b/kernel/drivers/mfd/wm831x-spi.c
new file mode 100644 (file)
index 0000000..b8a5e3b
--- /dev/null
+++ b/kernel/drivers/mfd/wm831x-spi.c
@@ -0,0 +1,127 @@
+/*
+ * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
+ *
+ * Copyright 2009,2010 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.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/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+
+#include <linux/mfd/wm831x/core.h>
+
+static int wm831x_spi_probe(struct spi_device *spi)
+{
+       const struct spi_device_id *id = spi_get_device_id(spi);
+       struct wm831x *wm831x;
+       enum wm831x_parent type;
+       int ret;
+
+       type = (enum wm831x_parent)id->driver_data;
+
+       wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
+       if (wm831x == NULL)
+               return -ENOMEM;
+
+       spi->mode = SPI_MODE_0;
+
+       spi_set_drvdata(spi, wm831x);
+       wm831x->dev = &spi->dev;
+
+       wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
+       if (IS_ERR(wm831x->regmap)) {
+               ret = PTR_ERR(wm831x->regmap);
+               dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+                       ret);
+               return ret;
+       }
+
+       return wm831x_device_init(wm831x, type, spi->irq);
+}
+
+static int wm831x_spi_remove(struct spi_device *spi)
+{
+       struct wm831x *wm831x = spi_get_drvdata(spi);
+
+       wm831x_device_exit(wm831x);
+
+       return 0;
+}
+
+static int wm831x_spi_suspend(struct device *dev)
+{
+       struct wm831x *wm831x = dev_get_drvdata(dev);
+
+       return wm831x_device_suspend(wm831x);
+}
+
+static int wm831x_spi_poweroff(struct device *dev)
+{
+       struct wm831x *wm831x = dev_get_drvdata(dev);
+
+       wm831x_device_shutdown(wm831x);
+
+       return 0;
+}
+
+static const struct dev_pm_ops wm831x_spi_pm = {
+       .freeze = wm831x_spi_suspend,
+       .suspend = wm831x_spi_suspend,
+       .poweroff = wm831x_spi_poweroff,
+};
+
+static const struct spi_device_id wm831x_spi_ids[] = {
+       { "wm8310", WM8310 },
+       { "wm8311", WM8311 },
+       { "wm8312", WM8312 },
+       { "wm8320", WM8320 },
+       { "wm8321", WM8321 },
+       { "wm8325", WM8325 },
+       { "wm8326", WM8326 },
+       { },
+};
+MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
+
+static struct spi_driver wm831x_spi_driver = {
+       .driver = {
+               .name   = "wm831x",
+               .owner  = THIS_MODULE,
+               .pm     = &wm831x_spi_pm,
+       },
+       .id_table       = wm831x_spi_ids,
+       .probe          = wm831x_spi_probe,
+       .remove         = wm831x_spi_remove,
+};
+
+static int __init wm831x_spi_init(void)
+{
+       int ret;
+
+       ret = spi_register_driver(&wm831x_spi_driver);
+       if (ret != 0)
+               pr_err("Failed to register WM831x SPI driver: %d\n", ret);
+
+       return 0;
+}
+subsys_initcall(wm831x_spi_init);
+
+static void __exit wm831x_spi_exit(void)
+{
+       spi_unregister_driver(&wm831x_spi_driver);
+}
+module_exit(wm831x_spi_exit);
+
+MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mark Brown");