Squashandroid-20111012

Change-Id: If0ae9fa8067740ab2ede33703c79ec134f204a5e

1 files changed, 102 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
new file mode 100644
index 00000000000..e6de6a279a5
--- /dev/null
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -0,0 +1,102 @@
+/*
+ * 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/pm.h>
+#include <linux/signal.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/ab8500/sysctrl.h>
+
+static struct device *sysctrl_dev;
+
+void ab8500_power_off(void)
+{
+	sigset_t old;
+	sigset_t all;
+
+	sigfillset(&all);
+
+	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
+					 AB8500_STW4500CTRL1_SWOFF |
+					 AB8500_STW4500CTRL1_SWRESET4500N);
+		(void)sigprocmask(SIG_SETMASK, &old, NULL);
+	}
+}
+
+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)
+{
+	struct ab8500_platform_data *plat;
+
+	sysctrl_dev = &pdev->dev;
+	plat = dev_get_platdata(pdev->dev.parent);
+	if (plat->pm_power_off)
+		pm_power_off = ab8500_power_off;
+	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");