1 files changed, 80 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
new file mode 100644
index 000000000000..392185965b39
--- /dev/null
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/ab8500/sysctrl.h>
+
+static struct device *sysctrl_dev;
+
+static inline bool valid_bank(u8 bank)
+{
+        return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
+                (bank == AB8500_SYS_CTRL2_BLOCK));
+}
+
+int ab8500_sysctrl_read(u16 reg, u8 *value)
+{
+        u8 bank;
+
+        if (sysctrl_dev == NULL)
+                return -EAGAIN;
+
+        bank = (reg >> 8);
+        if (!valid_bank(bank))
+                return -EINVAL;
+
+        return abx500_get_register_interruptible(sysctrl_dev, bank,
+                (u8)(reg & 0xFF), value);
+}
+
+int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
+{
+        u8 bank;
+
+        if (sysctrl_dev == NULL)
+                return -EAGAIN;
+
+        bank = (reg >> 8);
+        if (!valid_bank(bank))
+                return -EINVAL;
+
+        return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
+                (u8)(reg & 0xFF), mask, value);
+}
+
+static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
+{
+        sysctrl_dev = &pdev->dev;
+        return 0;
+}
+
+static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
+{
+        sysctrl_dev = NULL;
+        return 0;
+}
+
+static struct platform_driver ab8500_sysctrl_driver = {
+        .driver = {
+                .name = "ab8500-sysctrl",
+                .owner = THIS_MODULE,
+        },
+        .probe = ab8500_sysctrl_probe,
+        .remove = __devexit_p(ab8500_sysctrl_remove),
+};
+
+static int __init ab8500_sysctrl_init(void)
+{
+        return platform_driver_register(&ab8500_sysctrl_driver);
+}
+subsys_initcall(ab8500_sysctrl_init);
+
+MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
+MODULE_DESCRIPTION("AB8500 system control driver");
+MODULE_LICENSE("GPL v2");