leds: LED driver for TI LP3952 6-Channel Color LED

The chip can drive 2 sets of RGB leds. Controller can be controlled via PWM, I2C and audio synchronisation. This driver uses I2C to communicate with the chip. Datasheet: http://www.ti.com/lit/gpn/lp3952 Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
2016-07-11 11:48:49 +01:00
parent bff23714bc
commit d966c943e4
4 changed files with 441 additions and 0 deletions
--- a/include/linux/leds-lp3952.h
+++ b/include/linux/leds-lp3952.h
@@ -0,0 +1,125 @@
+/*
+ *	LED driver for TI lp3952 controller
+ *
+ *	Copyright (C) 2016, DAQRI, LLC.
+ *	Author: Tony Makkiel <tony.makkiel@daqri.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.
+ *
+ */
+
+#ifndef LEDS_LP3952_H_
+#define LEDS_LP3952_H_
+
+#define LP3952_NAME                         "lp3952"
+#define LP3952_CMD_REG_COUNT                8
+#define LP3952_BRIGHT_MAX                   4
+#define LP3952_LABEL_MAX_LEN                15
+
+#define LP3952_REG_LED_CTRL                 0x00
+#define LP3952_REG_R1_BLNK_TIME_CTRL        0x01
+#define LP3952_REG_R1_BLNK_CYCLE_CTRL       0x02
+#define LP3952_REG_G1_BLNK_TIME_CTRL        0x03
+#define LP3952_REG_G1_BLNK_CYCLE_CTRL       0x04
+#define LP3952_REG_B1_BLNK_TIME_CTRL        0x05
+#define LP3952_REG_B1_BLNK_CYCLE_CTRL       0x06
+#define LP3952_REG_ENABLES                  0x0B
+#define LP3952_REG_PAT_GEN_CTRL             0x11
+#define LP3952_REG_RGB1_MAX_I_CTRL          0x12
+#define LP3952_REG_RGB2_MAX_I_CTRL          0x13
+#define LP3952_REG_CMD_0                    0x50
+#define LP3952_REG_RESET                    0x60
+#define REG_MAX                             LP3952_REG_RESET
+
+#define LP3952_PATRN_LOOP                   BIT(1)
+#define LP3952_PATRN_GEN_EN                 BIT(2)
+#define LP3952_INT_B00ST_LDR                BIT(2)
+#define LP3952_ACTIVE_MODE                  BIT(6)
+#define LP3952_LED_MASK_ALL                 0x3f
+
+/* Transition Time in ms */
+enum lp3952_tt {
+	TT0,
+	TT55,
+	TT110,
+	TT221,
+	TT422,
+	TT885,
+	TT1770,
+	TT3539
+};
+
+/* Command Execution Time in ms */
+enum lp3952_cet {
+	CET197,
+	CET393,
+	CET590,
+	CET786,
+	CET1180,
+	CET1376,
+	CET1573,
+	CET1769,
+	CET1966,
+	CET2163,
+	CET2359,
+	CET2556,
+	CET2763,
+	CET2949,
+	CET3146
+};
+
+/* Max Current in % */
+enum lp3952_colour_I_log_0 {
+	I0,
+	I7,
+	I14,
+	I21,
+	I32,
+	I46,
+	I71,
+	I100
+};
+
+enum lp3952_leds {
+	LP3952_BLUE_2,
+	LP3952_GREEN_2,
+	LP3952_RED_2,
+	LP3952_BLUE_1,
+	LP3952_GREEN_1,
+	LP3952_RED_1,
+	LP3952_LED_ALL
+};
+
+struct lp3952_ctrl_hdl {
+	struct led_classdev cdev;
+	char name[LP3952_LABEL_MAX_LEN];
+	enum lp3952_leds channel;
+	void *priv;
+};
+
+struct ptrn_gen_cmd {
+	union {
+		struct {
+			u16 tt:3;
+			u16 b:3;
+			u16 cet:4;
+			u16 g:3;
+			u16 r:3;
+		};
+		struct {
+			u8 lsb;
+			u8 msb;
+		} bytes;
+	};
+} __packed;
+
+struct lp3952_led_array {
+	struct regmap *regmap;
+	struct i2c_client *client;
+	struct gpio_desc *enable_gpio;
+	struct lp3952_ctrl_hdl leds[LP3952_LED_ALL];
+};
+
+#endif /* LEDS_LP3952_H_ */