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path: root/drivers/mfd/ab8500-sysctrl.c
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-rw-r--r--drivers/mfd/ab8500-sysctrl.c80
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 0000000..3921859
--- /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");