[PATCH 03/06] MFD: DA9052/53 MFD core module v9 Added SPI support

[Ashish Jangam]

The DA9052/53 is a highly integrated PMIC subsystem with supply domain
flexibility to support wide range of high performance application.

It provides voltage regulators, GPIO controller, Touch Screen, RTC, Battery
control and other functionality.

This patch is functionally tested on Samsung SMDKV6410.

Signed-off-by: David Dajun Chen <dchen@xxxxxxxxxxx>
Signed-off-by: Ashish Jangam <ashish.jangam@xxxxxxxxxxxxxxx>
---
 drivers/mfd/Kconfig               |   12 ++++
 drivers/mfd/Makefile              |    1 +
 drivers/mfd/da9052-spi.c          |  121 +++++++++++++++++++++++++++++++++++++
 include/linux/mfd/da9052/da9052.h |    1 +
 4 files changed, 135 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mfd/da9052-spi.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index baced42..c8322ee 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -332,6 +332,18 @@ config PMIC_DA9052
 	bool
 	select MFD_CORE
 
+config MFD_DA9052_SPI
+	bool "Support Dialog Semiconductor DA9052/53 PMIC variants with SPI"
+	select REGMAP_SPI
+	select REGMAP_IRQ
+	select PMIC_DA9052
+	depends on SPI_MASTER=y
+	help
+	  Support for the Dialog Semiconductor DA9052 PMIC
+	  when controlled using SPI. This driver provides common support
+	  for accessing the device, additional drivers must be enabled in
+	  order to use the functionality of the device.
+
 config MFD_DA9052_I2C
 	bool "Support Dialog Semiconductor DA9052/53 PMIC variants with I2C"
 	select REGMAP_I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 484f209..d5f5743 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_UCB1400_CORE)	+= ucb1400_core.o
 obj-$(CONFIG_PMIC_DA903X)	+= da903x.o
 
 obj-$(CONFIG_PMIC_DA9052)	+= da9052-core.o
+obj-$(CONFIG_MFD_DA9052_SPI)	+= da9052-spi.o
 obj-$(CONFIG_MFD_DA9052_I2C)	+= da9052-i2c.o
 
 max8925-objs			:= max8925-core.o max8925-i2c.o
diff --git a/drivers/mfd/da9052-spi.c b/drivers/mfd/da9052-spi.c
new file mode 100644
index 0000000..f74faa1
--- /dev/null
+++ b/drivers/mfd/da9052-spi.c
@@ -0,0 +1,121 @@
+/*
+ * SPI access for Dialog DA9052 PMICs.
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ * 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/device.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/mfd/core.h>
+#include <linux/spi/spi.h>
+#include <linux/err.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+static struct regmap_config da9052_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = 1,
+	.write_flag_mask = 0,
+};
+
+static int da9052_spi_probe(struct spi_device *spi)
+{
+	int ret;
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct da9052 *da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
+
+	if (!da9052)
+		return -ENOMEM;
+
+	spi->mode = SPI_MODE_0 | SPI_CPOL;
+	spi->bits_per_word = 8;
+	spi_setup(spi);
+
+	da9052->dev = &spi->dev;
+	da9052->spi_dev = spi;
+	da9052->chip_irq = spi->irq;
+
+	dev_set_drvdata(&spi->dev, da9052);
+
+	da9052->regmap = regmap_init_spi(spi, &da9052_regmap_config);
+	if (IS_ERR(da9052->regmap)) {
+		ret = PTR_ERR(da9052->regmap);
+		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+			ret);
+		goto err;
+	}
+
+	ret = da9052_device_init(da9052, id->driver_data);
+	if (ret != 0)
+		goto err;
+
+	return 0;
+
+err:
+	kfree(da9052);
+	return ret;
+}
+
+static int da9052_spi_remove(struct spi_device *spi)
+{
+	struct da9052 *da9052 = dev_get_drvdata(&spi->dev);
+
+	da9052_device_exit(da9052);
+	kfree(da9052);
+
+	return 0;
+}
+
+static struct spi_device_id da9052_spi_id[] = {
+	{"da9052", DA9052},
+	{"da9053-aa", DA9053_AA},
+	{"da9053-ba", DA9053_BA},
+	{"da9053-bb", DA9053_BB},
+	{}
+};
+
+static struct spi_driver da9052_spi_driver = {
+	.probe = da9052_spi_probe,
+	.remove = __devexit_p(da9052_spi_remove),
+	.id_table = da9052_spi_id,
+	.driver = {
+		.name = "da9052",
+		.bus = &spi_bus_type,
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init da9052_spi_init(void)
+{
+	int ret;
+
+	ret = spi_register_driver(&da9052_spi_driver);
+	if (ret != 0) {
+		pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+subsys_initcall(da9052_spi_init);
+
+static void __exit da9052_spi_exit(void)
+{
+	spi_unregister_driver(&da9052_spi_driver);
+}
+module_exit(da9052_spi_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index a4db9b8..a799655 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -94,6 +94,7 @@ struct da9052 {
 	struct mutex auxadc_lock;
 
 	struct device *dev;
+	struct spi_device *spi_dev;
 	struct i2c_client *i2c_client;
 	struct regmap *regmap;
 
-- 
1.7.1


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