mfd: Add mc13xxx i2c driver

Adds support for mc13xxx family ICs connected via i2c.

Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
Acked-by: Oskar Schirmer <oskar@scara.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 137 insertions, 1 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9c8294c26efb..ef86a741b7e2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -597,7 +597,7 @@ config MFD_MC13783
 
 config MFD_MC13XXX
         tristate "Support Freescale MC13783 and MC13892"
-        depends on SPI_MASTER
+        depends on SPI_MASTER || I2C
         select MFD_CORE
         select MFD_MC13783
         help
@@ -615,6 +615,13 @@ config MFD_MC13XXX_SPI
         help
           Select this if your MC13xxx is connected via an SPI bus.
 
+config MFD_MC13XXX_I2C
+        tristate "MC13xxx I2C interface" if I2C
+        default I2C
+        select REGMAP_I2C
+        help
+          Select this if your MC13xxx is connected via an I2C bus.
+
 endif
 
 config ABX500_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 7ce5b5c15dee..5dd6be7aa350 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_TWL6040_CORE)	+= twl6040-core.o twl6040-irq.o
 
 obj-$(CONFIG_MFD_MC13XXX)       += mc13xxx-core.o
 obj-$(CONFIG_MFD_MC13XXX_SPI)   += mc13xxx-spi.o
+obj-$(CONFIG_MFD_MC13XXX_I2C)   += mc13xxx-i2c.o
 
 obj-$(CONFIG_MFD_CORE)          += mfd-core.o
 
diff --git a/drivers/mfd/mc13xxx-i2c.c b/drivers/mfd/mc13xxx-i2c.c
new file mode 100644
index 000000000000..d22501dad6a6
--- /dev/null
+++ b/drivers/mfd/mc13xxx-i2c.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2009-2010 Creative Product Design
+ * Marc Reilly marc@cpdesign.com.au
+ *
+ * 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/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mc13xxx.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+
+#include "mc13xxx.h"
+
+static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
+        {
+                .name = "mc13892",
+                .driver_data = MC13XXX_ID_MC13892,
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
+
+static const struct of_device_id mc13xxx_dt_ids[] = {
+        {
+                .compatible = "fsl,mc13892",
+                .data = (void *) &mc13xxx_i2c_device_id[0],
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
+
+static struct regmap_config mc13xxx_regmap_i2c_config = {
+        .reg_bits = 8,
+        .val_bits = 24,
+
+        .max_register = MC13XXX_NUMREGS,
+
+        .cache_type = REGCACHE_NONE,
+};
+
+static int mc13xxx_i2c_probe(struct i2c_client *client,
+                const struct i2c_device_id *id)
+{
+        const struct of_device_id *of_id;
+        struct i2c_driver *idrv = to_i2c_driver(client->dev.driver);
+        struct mc13xxx *mc13xxx;
+        struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
+        int ret;
+
+        of_id = of_match_device(mc13xxx_dt_ids, &client->dev);
+        if (of_id)
+                idrv->id_table = (const struct i2c_device_id*) of_id->data;
+
+        mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
+        if (!mc13xxx)
+                return -ENOMEM;
+
+        dev_set_drvdata(&client->dev, mc13xxx);
+
+        mc13xxx->dev = &client->dev;
+        mutex_init(&mc13xxx->lock);
+
+        mc13xxx->regmap = regmap_init_i2c(client, &mc13xxx_regmap_i2c_config);
+        if (IS_ERR(mc13xxx->regmap)) {
+                ret = PTR_ERR(mc13xxx->regmap);
+                dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
+                                ret);
+                dev_set_drvdata(&client->dev, NULL);
+                kfree(mc13xxx);
+                return ret;
+        }
+
+        ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
+
+        if (ret == 0 && (id->driver_data != mc13xxx->ictype))
+                dev_warn(mc13xxx->dev,
+                                "device id doesn't match auto detection!\n");
+
+        return ret;
+}
+
+static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
+{
+        struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
+
+        mc13xxx_common_cleanup(mc13xxx);
+
+        return 0;
+}
+
+static struct i2c_driver mc13xxx_i2c_driver = {
+        .id_table = mc13xxx_i2c_device_id,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "mc13xxx",
+                .of_match_table = mc13xxx_dt_ids,
+        },
+        .probe = mc13xxx_i2c_probe,
+        .remove = __devexit_p(mc13xxx_i2c_remove),
+};
+
+static int __init mc13xxx_i2c_init(void)
+{
+        return i2c_add_driver(&mc13xxx_i2c_driver);
+}
+subsys_initcall(mc13xxx_i2c_init);
+
+static void __exit mc13xxx_i2c_exit(void)
+{
+        i2c_del_driver(&mc13xxx_i2c_driver);
+}
+module_exit(mc13xxx_i2c_exit);
+
+MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
+MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
+MODULE_LICENSE("GPL v2");