mfd: da9063: Add Dialog DA9063 core driver

This is MFD module providing access to registers and interrupts of DA906x
series PMIC. It is used by other functional modules, registered as MFD cells.
Driver uses regmap with paging to access extended register list. Register map
is divided into two pages, where the second page is used during initialisation.

This module provides support to following functional cells:
 - Regulators
 - RTC
 - HWMON
 - OnKey (power key misc input device)
 - Vibration (force-feedback input device)
 - Watchdog
 - LEDs

Signed-off-by: Krystian Garbaciak <krystian.garbaciak@diasemi.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c
new file mode 100644
index 000000000000..29f3ed1f076c
--- /dev/null
+++ b/drivers/mfd/da9063-core.c
@@ -0,0 +1,129 @@
+/*
+ * da9063-core.c: Device access for Dialog DA9063 modules
+ *
+ * Copyright 2012 Dialog Semiconductors Ltd.
+ * Copyright 2013 Philipp Zabel, Pengutronix
+ *
+ * Author: Krystian Garbaciak <krystian.garbaciak@diasemi.com>,
+ *         Michal Hajduk <michal.hajduk@diasemi.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/init.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/da9063/core.h>
+#include <linux/mfd/da9063/pdata.h>
+#include <linux/mfd/da9063/registers.h>
+
+#include <linux/proc_fs.h>
+#include <linux/kthread.h>
+#include <linux/uaccess.h>
+
+
+static struct mfd_cell da9063_devs[] = {
+	{
+		.name		= DA9063_DRVNAME_REGULATORS,
+	},
+	{
+		.name		= DA9063_DRVNAME_LEDS,
+	},
+	{
+		.name		= DA9063_DRVNAME_WATCHDOG,
+	},
+	{
+		.name		= DA9063_DRVNAME_HWMON,
+	},
+	{
+		.name		= DA9063_DRVNAME_ONKEY,
+	},
+	{
+		.name		= DA9063_DRVNAME_RTC,
+	},
+	{
+		.name		= DA9063_DRVNAME_VIBRATION,
+	},
+};
+
+int da9063_device_init(struct da9063 *da9063, unsigned int irq)
+{
+	struct da9063_pdata *pdata = da9063->dev->platform_data;
+	int model, revision;
+	int ret;
+
+	if (pdata) {
+		da9063->flags = pdata->flags;
+		da9063->irq_base = pdata->irq_base;
+	} else {
+		da9063->flags = 0;
+		da9063->irq_base = 0;
+	}
+	da9063->chip_irq = irq;
+
+	if (pdata && pdata->init != NULL) {
+		ret = pdata->init(da9063);
+		if (ret != 0) {
+			dev_err(da9063->dev,
+				"Platform initialization failed.\n");
+			return ret;
+		}
+	}
+
+	ret = regmap_read(da9063->regmap, DA9063_REG_CHIP_ID, &model);
+	if (ret < 0) {
+		dev_err(da9063->dev, "Cannot read chip model id.\n");
+		return -EIO;
+	}
+	if (model != PMIC_DA9063) {
+		dev_err(da9063->dev, "Invalid chip model id: 0x%02x\n", model);
+		return -ENODEV;
+	}
+
+	ret = regmap_read(da9063->regmap, DA9063_REG_CHIP_VARIANT, &revision);
+	if (ret < 0) {
+		dev_err(da9063->dev, "Cannot read chip revision id.\n");
+		return -EIO;
+	}
+	revision >>= DA9063_CHIP_VARIANT_SHIFT;
+	if (revision != 3) {
+		dev_err(da9063->dev, "Unknown chip revision: %d\n", revision);
+		return -ENODEV;
+	}
+
+	da9063->model = model;
+	da9063->revision = revision;
+
+	dev_info(da9063->dev,
+		 "Device detected (model-ID: 0x%02X  rev-ID: 0x%02X)\n",
+		 model, revision);
+
+	ret = mfd_add_devices(da9063->dev, -1, da9063_devs,
+			      ARRAY_SIZE(da9063_devs), NULL, da9063->irq_base,
+			      NULL);
+	if (ret)
+		dev_err(da9063->dev, "Cannot add MFD cells\n");
+
+	return ret;
+}
+
+void da9063_device_exit(struct da9063 *da9063)
+{
+	mfd_remove_devices(da9063->dev);
+}
+
+MODULE_DESCRIPTION("PMIC driver for Dialog DA9063");
+MODULE_AUTHOR("Krystian Garbaciak <krystian.garbaciak@diasemi.com>, Michal Hajduk <michal.hajduk@diasemi.com>");
+MODULE_LICENSE("GPL");