mfd: AB8500 register access via PRCMU I2C
This patch adds the choice of accessing the AB8500 registers
via prcmu I2C. Access either via SPI or I2C is supported.
Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/ab8500-i2c.c b/drivers/mfd/ab8500-i2c.c
new file mode 100644
index 0000000..6820327
--- /dev/null
+++ b/drivers/mfd/ab8500-i2c.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
+ * License Terms: GNU General Public License v2
+ * This file was based on drivers/mfd/ab8500-spi.c
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ab8500.h>
+
+#include <mach/prcmu.h>
+
+static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
+{
+ int ret;
+
+ ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
+ if (ret < 0)
+ dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
+ return ret;
+}
+
+static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
+{
+ int ret;
+ u8 data;
+
+ ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
+ if (ret < 0) {
+ dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
+ return ret;
+ }
+ return (int)data;
+}
+
+static int __devinit ab8500_i2c_probe(struct platform_device *plf)
+{
+ struct ab8500 *ab8500;
+ struct resource *resource;
+ int ret;
+
+ ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
+ if (!ab8500)
+ return -ENOMEM;
+
+ ab8500->dev = &plf->dev;
+
+ resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
+ if (!resource) {
+ kfree(ab8500);
+ return -ENODEV;
+ }
+
+ ab8500->irq = resource->start;
+
+ ab8500->read = ab8500_i2c_read;
+ ab8500->write = ab8500_i2c_write;
+
+ platform_set_drvdata(plf, ab8500);
+
+ ret = ab8500_init(ab8500);
+ if (ret)
+ kfree(ab8500);
+
+ return ret;
+}
+
+static int __devexit ab8500_i2c_remove(struct platform_device *plf)
+{
+ struct ab8500 *ab8500 = platform_get_drvdata(plf);
+
+ ab8500_exit(ab8500);
+ kfree(ab8500);
+
+ return 0;
+}
+
+static struct platform_driver ab8500_i2c_driver = {
+ .driver = {
+ .name = "ab8500-i2c",
+ .owner = THIS_MODULE,
+ },
+ .probe = ab8500_i2c_probe,
+ .remove = __devexit_p(ab8500_i2c_remove)
+};
+
+static int __init ab8500_i2c_init(void)
+{
+ return platform_driver_register(&ab8500_i2c_driver);
+}
+
+static void __exit ab8500_i2c_exit(void)
+{
+ platform_driver_unregister(&ab8500_i2c_driver);
+}
+subsys_initcall(ab8500_i2c_init);
+module_exit(ab8500_i2c_exit);
+
+MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
+MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
+MODULE_LICENSE("GPL v2");