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>

Documentation/ABI/testing/sysfs-bus-i2c-devices-lm3533

+What:		/sys/bus/i2c/devices/.../boost_freq
+Date:		April 2012
+KernelVersion:	3.5
+Contact:	Johan Hovold <jhovold@gmail.com>
+Description:
+		Set the boost converter switching frequency (0, 1), where
+
+		0 -  500Hz
+		1 - 1000Hz
+
+What:		/sys/bus/i2c/devices/.../boost_ovp
+Date:		April 2012
+KernelVersion:	3.5
+Contact:	Johan Hovold <jhovold@gmail.com>
+Description:
+		Set the boost converter over-voltage protection threshold
+		(0..3), where
+
+		0 - 16V
+		1 - 24V
+		2 - 32V
+		3 - 40V
+
+What:		/sys/bus/i2c/devices/.../output_hvled[n]
+Date:		April 2012
+KernelVersion:	3.5
+Contact:	Johan Hovold <jhovold@gmail.com>
+Description:
+		Set the controlling backlight device for high-voltage current
+		sink HVLED[n] (n = 1, 2) (0, 1).
+
+What:		/sys/bus/i2c/devices/.../output_lvled[n]
+Date:		April 2012
+KernelVersion:	3.5
+Contact:	Johan Hovold <jhovold@gmail.com>
+Description:
+		Set the controlling led device for low-voltage current sink
+		LVLED[n] (n = 1..5) (0..3).

drivers/mfd/Kconfig

@@ -106,6 +106,19 @@ config UCB1400_CORE
 	  To compile this driver as a module, choose M here: the
 	  module will be called ucb1400_core.
 
+config MFD_LM3533
+	tristate "LM3533 Lighting Power chip"
+	depends on I2C
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  Say yes here to enable support for National Semiconductor / TI
+	  LM3533 Lighting Power chips.
+
+	  This driver provides common support for accessing the device;
+	  additional drivers must be enabled in order to use the LED,
+	  backlight or ambient-light-sensor functionality of the device.
+
 config TPS6105X
 	tristate "TPS61050/61052 Boost Converters"
 	depends on I2C

drivers/mfd/Makefile

@@ -120,3 +120,4 @@ obj-$(CONFIG_MFD_INTEL_MSIC)	+= intel_msic.o
 obj-$(CONFIG_MFD_RC5T583)	+= rc5t583.o rc5t583-irq.o
 obj-$(CONFIG_MFD_S5M_CORE)	+= s5m-core.o s5m-irq.o
 obj-$(CONFIG_MFD_ANATOP)	+= anatop-mfd.o
+obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o

drivers/mfd/lm3533-ctrlbank.c

+/*
+ * 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");

include/linux/mfd/lm3533.h

+/*
+ * lm3533.h -- LM3533 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.
+ */
+
+#ifndef __LINUX_MFD_LM3533_H
+#define __LINUX_MFD_LM3533_H
+
+#define LM3533_ATTR_RO(_name) \
+	DEVICE_ATTR(_name, S_IRUGO, show_##_name, NULL)
+#define LM3533_ATTR_RW(_name) \
+	DEVICE_ATTR(_name, S_IRUGO | S_IWUSR , show_##_name, store_##_name)
+
+struct device;
+struct regmap;
+
+struct lm3533 {
+	struct device *dev;
+
+	struct regmap *regmap;
+
+	int gpio_hwen;
+	int irq;
+
+	unsigned have_als:1;
+	unsigned have_backlights:1;
+	unsigned have_leds:1;
+};
+
+struct lm3533_ctrlbank {
+	struct lm3533 *lm3533;
+	struct device *dev;
+	int id;
+};
+
+struct lm3533_als_platform_data {
+	unsigned pwm_mode:1;		/* PWM input mode (default analog) */
+};
+
+struct lm3533_bl_platform_data {
+	char *name;
+	u8 default_brightness;		/* 0 - 255 */
+	u8 max_current;			/* 0 - 31 */
+	u8 pwm;				/* 0 - 0x3f */
+};
+
+struct lm3533_led_platform_data {
+	char *name;
+	const char *default_trigger;
+	u8 max_current;			/* 0 - 31 */
+	u8 pwm;				/* 0 - 0x3f */
+};
+
+struct lm3533_platform_data {
+	int gpio_hwen;
+
+	struct lm3533_als_platform_data *als;
+
+	struct lm3533_bl_platform_data *backlights;
+	int num_backlights;
+
+	struct lm3533_led_platform_data *leds;
+	int num_leds;
+};
+
+extern int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb);
+extern int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb);
+
+extern int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val);
+extern int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val);
+extern int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u8 val);
+extern int lm3533_ctrlbank_get_max_current(struct lm3533_ctrlbank *cb,
+								u8 *val);
+extern int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val);
+extern int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val);
+
+extern int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val);
+extern int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val);
+extern int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask);
+
+#endif	/* __LINUX_MFD_LM3533_H */