mfd: Add LM3533 lighting-power core driver

Add support for National Semiconductor / TI LM3533 lighting power chips.

This is the core driver which provides register access over I2C and
registers the ambient-light-sensor, LED and backlight sub-drivers.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 134 insertions, 0 deletions

diff --git a/drivers/mfd/lm3533-ctrlbank.c b/drivers/mfd/lm3533-ctrlbank.c
new file mode 100644
index 000000000000..c2732a37c65a
--- /dev/null
+++ b/drivers/mfd/lm3533-ctrlbank.c
@@ -0,0 +1,134 @@
+/*
+ * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
+ *
+ * Copyright (C) 2011-2012 Texas Instruments
+ *
+ * Author: Johan Hovold <jhovold@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+
+#include <linux/mfd/lm3533.h>
+
+
+#define LM3533_BRIGHTNESS_MAX           255
+#define LM3533_MAX_CURRENT_MAX          31
+#define LM3533_PWM_MAX                  0x3f
+
+#define LM3533_REG_PWM_BASE             0x14
+#define LM3533_REG_MAX_CURRENT_BASE     0x1f
+#define LM3533_REG_CTRLBANK_ENABLE      0x27
+#define LM3533_REG_BRIGHTNESS_BASE      0x40
+
+
+static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
+{
+        return base + cb->id;
+}
+
+int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
+{
+        u8 mask;
+        int ret;
+
+        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
+
+        mask = 1 << cb->id;
+        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
+                                                                mask, mask);
+        if (ret)
+                dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
+
+int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
+{
+        u8 mask;
+        int ret;
+
+        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
+
+        mask = 1 << cb->id;
+        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
+        if (ret)
+                dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
+
+#define lm3533_ctrlbank_set(_name, _NAME)                               \
+int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val)     \
+{                                                                       \
+        u8 reg;                                                         \
+        int ret;                                                        \
+                                                                        \
+        if (val > LM3533_##_NAME##_MAX)                                 \
+                return -EINVAL;                                         \
+                                                                        \
+        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
+        ret = lm3533_write(cb->lm3533, reg, val);                       \
+        if (ret)                                                        \
+                dev_err(cb->dev, "failed to set " #_name "\n");         \
+                                                                        \
+        return ret;                                                     \
+}                                                                       \
+EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
+
+#define lm3533_ctrlbank_get(_name, _NAME)                               \
+int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val)    \
+{                                                                       \
+        u8 reg;                                                         \
+        int ret;                                                        \
+                                                                        \
+        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
+        ret = lm3533_read(cb->lm3533, reg, val);                        \
+        if (ret)                                                        \
+                dev_err(cb->dev, "failed to get " #_name "\n");         \
+                                                                        \
+        return ret;                                                     \
+}                                                                       \
+EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
+
+lm3533_ctrlbank_set(brightness, BRIGHTNESS);
+lm3533_ctrlbank_get(brightness, BRIGHTNESS);
+
+/*
+ * Full scale current.
+ *
+ * Imax = 5 + val * 0.8 mA, e.g.:
+ *
+ *    0 - 5 mA
+ *     ...
+ *   19 - 20.2 mA (default)
+ *     ...
+ *   31 - 29.8 mA
+ */
+lm3533_ctrlbank_set(max_current, MAX_CURRENT);
+lm3533_ctrlbank_get(max_current, MAX_CURRENT);
+
+/*
+ * PWM-input control mask:
+ *
+ *   bit 5 - PWM-input enabled in Zone 4
+ *   bit 4 - PWM-input enabled in Zone 3
+ *   bit 3 - PWM-input enabled in Zone 2
+ *   bit 2 - PWM-input enabled in Zone 1
+ *   bit 1 - PWM-input enabled in Zone 0
+ *   bit 0 - PWM-input enabled
+ */
+lm3533_ctrlbank_set(pwm, PWM);
+lm3533_ctrlbank_get(pwm, PWM);
+
+
+MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
+MODULE_DESCRIPTION("LM3533 Control Bank interface");
+MODULE_LICENSE("GPL");