linux-imx

/*

 * LP5521 LED chip driver.

 *

 * Copyright (C) 2010 Nokia Corporation

 * Copyright (C) 2012 Texas Instruments

 *

 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>

 *          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.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA

 * 02110-1301 USA

 */

​

#include <linux/delay.h>

#include <linux/firmware.h>

#include <linux/i2c.h>

#include <linux/leds.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/platform_data/leds-lp55xx.h>

#include <linux/slab.h>

#include <linux/of.h>

​

#include "leds-lp55xx-common.h"

​

#define LP5521_PROGRAM_LENGTH       32

#define LP5521_MAX_LEDS         3

#define LP5521_CMD_DIRECT       0x3F

​

/* Registers */

#define LP5521_REG_ENABLE       0x00

#define LP5521_REG_OP_MODE      0x01

#define LP5521_REG_R_PWM        0x02

#define LP5521_REG_G_PWM        0x03

#define LP5521_REG_B_PWM        0x04

#define LP5521_REG_R_CURRENT        0x05

#define LP5521_REG_G_CURRENT        0x06

#define LP5521_REG_B_CURRENT        0x07

#define LP5521_REG_CONFIG       0x08

#define LP5521_REG_STATUS       0x0C

#define LP5521_REG_RESET        0x0D

#define LP5521_REG_R_PROG_MEM       0x10

#define LP5521_REG_G_PROG_MEM       0x30

#define LP5521_REG_B_PROG_MEM       0x50

​

/* Base register to set LED current */

#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT

/* Base register to set the brightness */

#define LP5521_REG_LED_PWM_BASE     LP5521_REG_R_PWM

​

/* Bits in ENABLE register */

#define LP5521_MASTER_ENABLE        0x40    /* Chip master enable */

#define LP5521_LOGARITHMIC_PWM      0x80    /* Logarithmic PWM adjustment */

#define LP5521_EXEC_RUN         0x2A

#define LP5521_ENABLE_DEFAULT   \

    (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)

#define LP5521_ENABLE_RUN_PROGRAM   \

    (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)

​

/* CONFIG register */

#define LP5521_PWM_HF           0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */

#define LP5521_PWRSAVE_EN       0x20    /* 1 = Power save mode */

#define LP5521_CP_MODE_OFF      0   /* Charge pump (CP) off */

#define LP5521_CP_MODE_BYPASS       8   /* CP forced to bypass mode */

#define LP5521_CP_MODE_1X5      0x10    /* CP forced to 1.5x mode */

#define LP5521_CP_MODE_AUTO     0x18    /* Automatic mode selection */

#define LP5521_R_TO_BATT        0x04    /* R out: 0 = CP, 1 = Vbat */

#define LP5521_CLK_INT          0x01    /* Internal clock */

#define LP5521_DEFAULT_CFG      \

    (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)

​

/* Status */

#define LP5521_EXT_CLK_USED     0x08

​

/* default R channel current register value */

#define LP5521_REG_R_CURR_DEFAULT   0xAF

​

/* Reset register value */

#define LP5521_RESET            0xFF

​

/* Program Memory Operations */