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
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");