[PATCHv3 3/4] mc13xxx: Add i2c driver

From: Marc Reilly <marc-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	u.kleine-koenig-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org
Cc: w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org,
	spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Marc Reilly <marc-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org>
Subject: [PATCHv3 3/4] mc13xxx: Add i2c driver
Date: Mon, 20 Dec 2010 14:50:54 +1100	[thread overview]
Message-ID: <1292817055-17715-4-git-send-email-marc@cpdesign.com.au> (raw)
In-Reply-To: <1292817055-17715-1-git-send-email-marc-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org>

Adds i2c specific code for mc13xxx.

Signed-off-by: Marc Reilly <marc-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org>
---
 drivers/mfd/mc13xxx-i2c.c |  115 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 115 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mfd/mc13xxx-i2c.c

diff --git a/drivers/mfd/mc13xxx-i2c.c b/drivers/mfd/mc13xxx-i2c.c
new file mode 100644
index 0000000..f7ceed8
--- /dev/null
+++ b/drivers/mfd/mc13xxx-i2c.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2009-2010 Creative Product Design
+ * Marc Reilly marc-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org
+ *
+ *
+ * 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/i2c.h>
+
+static int mc13xxx_i2c_reg_read(struct mc13xxx *mc13xxx, unsigned int offset,
+		u32 *val)
+{
+	int ret;
+	unsigned char buf[3] = {0, 0, 0};
+
+	ret = i2c_smbus_read_i2c_block_data(mc13xxx->i2cclient,
+			offset, 3, buf);
+	*val = buf[0] << 16 | buf[1] << 8 | buf[2];
+
+	return ret == 3 ? 0 : ret;
+}
+
+static int mc13xxx_i2c_reg_write(struct mc13xxx *mc13xxx, unsigned int offset,
+		u32 val)
+{
+	int ret;
+	unsigned char buf[3];
+
+	buf[0] = (val >> 16) & 0xff;
+	buf[1] = (val >> 8) & 0xff;
+	buf[2] = val & 0xff;
+
+	ret = i2c_smbus_write_i2c_block_data(mc13xxx->i2cclient,
+			offset, 3, buf);
+
+	return ret;
+}
+
+static int mc13xxx_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct mc13xxx *mc13xxx;
+	struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
+	int ret;
+
+	mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
+	if (!mc13xxx)
+		return -ENOMEM;
+
+	dev_set_drvdata(&client->dev, mc13xxx);
+	mc13xxx->dev = &client->dev;
+	mc13xxx->i2cclient = client;
+	mc13xxx->read_dev = mc13xxx_i2c_reg_read;
+	mc13xxx->write_dev = mc13xxx_i2c_reg_write;
+
+	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);
+
+	free_irq(client->irq, mc13xxx);
+
+	mfd_remove_devices(&client->dev);
+
+	kfree(mc13xxx);
+
+	return 0;
+}
+
+static const struct i2c_device_id mc13xxx_i2c_idtable[] = {
+	{ "mc13892", MC13XXX_ID_MC13892},
+	{ }
+};
+
+static struct i2c_driver mc13xxx_i2c_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "mc13xxx-i2c"
+	},
+	.id_table = mc13xxx_i2c_idtable,
+	.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-DtE7ei5U7Kg0n/F98K4Iww@public.gmane.org");
+MODULE_LICENSE("GPL v2");
-- 
1.7.1
