mfd: arizona: SPI bus interface

Several forthcoming Wolfson devices are based on a common platform
known as Arizona allowing a great deal of reuse of driver code. This
patch adds SPI bus interface code for the devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
new file mode 100644 (file)
index 0000000..f4bedaf
--- /dev/null
+++ b/drivers/mfd/arizona-spi.c
@@ -0,0 +1,91 @@
+/*
+ * arizona-spi.c  --  Arizona SPI bus interface
+ *
+ * Copyright 2012 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 version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+
+#include <linux/mfd/arizona/core.h>
+
+#include "arizona.h"
+
+static int __devinit arizona_spi_probe(struct spi_device *spi)
+{
+       const struct spi_device_id *id = spi_get_device_id(spi);
+       struct arizona *arizona;
+       const struct regmap_config *regmap_config;
+       int ret;
+
+       switch (id->driver_data) {
+#ifdef CONFIG_MFD_WM5102
+       case WM5102:
+               regmap_config = &wm5102_spi_regmap;
+               break;
+#endif
+       default:
+               dev_err(&spi->dev, "Unknown device type %ld\n",
+                       id->driver_data);
+               return -EINVAL;
+       }
+
+       arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
+       if (arizona == NULL)
+               return -ENOMEM;
+
+       arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
+       if (IS_ERR(arizona->regmap)) {
+               ret = PTR_ERR(arizona->regmap);
+               dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+                       ret);
+               return ret;
+       }
+
+       arizona->type = id->driver_data;
+       arizona->dev = &spi->dev;
+       arizona->irq = spi->irq;
+
+       return arizona_dev_init(arizona);
+}
+
+static int __devexit arizona_spi_remove(struct spi_device *spi)
+{
+       struct arizona *arizona = dev_get_drvdata(&spi->dev);
+       arizona_dev_exit(arizona);
+       return 0;
+}
+
+static const struct spi_device_id arizona_spi_ids[] = {
+       { "wm5102", WM5102 },
+       { },
+};
+MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
+
+static struct spi_driver arizona_spi_driver = {
+       .driver = {
+               .name   = "arizona",
+               .owner  = THIS_MODULE,
+               .pm     = &arizona_pm_ops,
+       },
+       .probe          = arizona_spi_probe,
+       .remove         = __devexit_p(arizona_spi_remove),
+       .id_table       = arizona_spi_ids,
+};
+
+module_spi_driver(arizona_spi_driver);
+
+MODULE_DESCRIPTION("Arizona SPI bus interface");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");