leds-lp55xx: add new common driver for lp5521/5523

 This patch supports basic common driver code for LP5521, LP5523/55231 devices.

 ( Driver Structure Data )

 lp55xx_led and lp55xx_chip
 In lp55xx common driver, two different data structure is used.
 o lp55xx_led
   control multi output LED channels such as led current, channel index.
 o lp55xx_chip
   general chip control such like the I2C and platform data.

 For example, LP5521 has maximum 3 LED channels.
 LP5523/55231 has 9 output channels.

 lp55xx_chip for LP5521 ... lp55xx_led #1
                            lp55xx_led #2
                            lp55xx_led #3

 lp55xx_chip for LP5523 ... lp55xx_led #1
                            lp55xx_led #2
                            .
                            .
                            lp55xx_led #9

 ( Platform Data )

 LP5521 and LP5523/55231 have own specific platform data.
 However, this data can be handled with just one platform data structure.
 The lp55xx platform data is declared in the header.
 This structure is derived from leds-lp5521.h and leds-lp5523.h

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
new file mode 100644
index 000000000000..1c716ecfa817
--- /dev/null
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -0,0 +1,59 @@
+/*
+ * LP5521/LP5523/LP55231 Common Driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from leds-lp5521.c, leds-lp5523.c
+ */
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-lp55xx.h>
+
+#include "leds-lp55xx-common.h"
+
+int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
+{
+	return i2c_smbus_write_byte_data(chip->cl, reg, val);
+}
+EXPORT_SYMBOL_GPL(lp55xx_write);
+
+int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
+{
+	s32 ret;
+
+	ret = i2c_smbus_read_byte_data(chip->cl, reg);
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_read);
+
+int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
+{
+	int ret;
+	u8 tmp;
+
+	ret = lp55xx_read(chip, reg, &tmp);
+	if (ret)
+		return ret;
+
+	tmp &= ~mask;
+	tmp |= val & mask;
+
+	return lp55xx_write(chip, reg, tmp);
+}
+EXPORT_SYMBOL_GPL(lp55xx_update_bits);
+
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_DESCRIPTION("LP55xx Common Driver");
+MODULE_LICENSE("GPL");