spring: Add LP5562 driver

BUG=chrome-os-partner:17341
TEST=Set LED color on Spring board
BRANCH=none

Change-Id: Ibae11a0cf8a724a38e96c5c49952799101bb5764
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/41693
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

4 files changed, 128 insertions, 0 deletions

diff --git a/board/spring/board.h b/board/spring/board.h
index dd2ef7bf99..dee62008ce 100644
--- a/board/spring/board.h
+++ b/board/spring/board.h
@@ -58,6 +58,9 @@
 /* Charger/accessories detection */
 #define CONFIG_TSU6721
 
+/* LED driver */
+#define CONFIG_LP5562
+
 /* Timer selection */
 #define TIM_CLOCK_MSB 2
 #define TIM_CLOCK_LSB 4
diff --git a/common/build.mk b/common/build.mk
index ee73575399..3366e0c254 100644
--- a/common/build.mk
+++ b/common/build.mk
@@ -18,6 +18,7 @@ common-$(CONFIG_FLASH)+=flash_common.o fmap.o
 common-$(CONFIG_I2C)+=i2c_commands.o
 common-$(CONFIG_IR357x)+=ir357x.o
 common-$(CONFIG_KEYBOARD_TEST)+=keyboard_test.o
+common-$(CONFIG_LP5562)+=lp5562.o
 common-$(CONFIG_LPC)+=port80.o
 common-$(CONFIG_POWER_LED)+=power_led.o
 common-$(CONFIG_PSTORE)+=pstore_commands.o
diff --git a/common/lp5562.c b/common/lp5562.c
new file mode 100644
index 0000000000..50f0f940a2
--- /dev/null
+++ b/common/lp5562.c
@@ -0,0 +1,86 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * TI LP5562 driver.
+ */
+
+#include "board.h"
+#include "console.h"
+#include "i2c.h"
+#include "lp5562.h"
+#include "timer.h"
+#include "uart.h"
+#include "util.h"
+
+/* 8-bit I2C address */
+#define LP5562_I2C_ADDR (0x30 << 1)
+
+inline int lp5562_write(uint8_t reg, uint8_t val)
+{
+	return i2c_write8(I2C_PORT_HOST, LP5562_I2C_ADDR, reg, val);
+}
+
+int lp5562_set_color(uint8_t red, uint8_t green, uint8_t blue)
+{
+	int ret = 0;
+
+	ret |= lp5562_write(LP5562_REG_B_PWM, blue);
+	ret |= lp5562_write(LP5562_REG_G_PWM, green);
+	ret |= lp5562_write(LP5562_REG_R_PWM, red);
+
+	return ret;
+}
+
+int lp5562_poweron(void)
+{
+	int ret = 0;
+
+	ret |= lp5562_write(LP5562_REG_ENABLE, 0x40);
+	udelay(500); /* start-up delay */
+
+	ret |= lp5562_write(LP5562_REG_CONFIG, 0x1);
+	ret |= lp5562_write(LP5562_REG_LED_MAP, 0x0);
+
+	return ret;
+}
+
+int lp5562_poweroff(void)
+{
+	return lp5562_write(LP5562_REG_ENABLE, 0x0);
+}
+
+/*****************************************************************************/
+/* Console commands */
+
+static int command_lp5562(int argc, char **argv)
+{
+	if (argc == 4) {
+		char *e;
+		uint8_t red, green, blue;
+
+		red = strtoi(argv[1], &e, 0);
+		if (e && *e)
+			return EC_ERROR_PARAM1;
+		green = strtoi(argv[2], &e, 0);
+		if (e && *e)
+			return EC_ERROR_PARAM2;
+		blue = strtoi(argv[3], &e, 0);
+		if (e && *e)
+			return EC_ERROR_PARAM3;
+
+		return lp5562_set_color(red, green, blue);
+	} else if (argc == 2) {
+		if (!strcasecmp(argv[1], "on"))
+			return lp5562_poweron();
+		else if (!strcasecmp(argv[1], "off"))
+			return lp5562_poweroff();
+		return EC_ERROR_PARAM1;
+	}
+
+	return EC_ERROR_INVAL;
+}
+DECLARE_CONSOLE_COMMAND(lp5562, command_lp5562,
+			"on | off | <red> <green> <blue>",
+			"Set the color of the LED",
+			NULL);
diff --git a/include/lp5562.h b/include/lp5562.h
new file mode 100644
index 0000000000..5e848ec9ac
--- /dev/null
+++ b/include/lp5562.h
@@ -0,0 +1,38 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * TI LP5562 LED driver.
+ */
+
+#ifndef LP5562_H
+#define LP5562_H
+
+#define LP5562_REG_ENABLE	0x00
+#define LP5562_REG_OP_MODE	0x01
+#define LP5562_REG_B_PWM	0x02
+#define LP5562_REG_G_PWM	0x03
+#define LP5562_REG_R_PWM	0x04
+#define LP5562_REG_B_CURRENT	0x05
+#define LP5562_REG_G_CURRENT	0x06
+#define LP5562_REG_R_CURRENT	0x07
+#define LP5562_REG_CONFIG	0x08
+#define LP5562_REG_ENG1_PC	0x09
+#define LP5562_REG_ENG2_PC	0x0a
+#define LP5562_REG_ENG3_PC	0x0b
+#define LP5562_REG_STATUS	0x0c
+#define LP5562_REG_RESET	0x0d
+#define LP5562_REG_W_PWM	0x0e
+#define LP5562_REG_W_CURRENT	0x0f
+#define LP5562_REG_LED_MAP	0x70
+
+/* Power on and initialize LP5562. */
+int lp5562_poweron(void);
+
+/* Power off LP5562. */
+int lp5562_poweroff(void);
+
+/* Set LED color. */
+int lp5562_set_color(uint8_t red, uint8_t green, uint8_t blue);
+
+#endif /* LP5562_H */