linux-imx

/*

 * Regulator driver for National Semiconductors LP3971 PMIC chip

 *

 *  Copyright (C) 2009 Samsung Electronics

 *  Author: Marek Szyprowski <m.szyprowski@samsung.com>

 *

 * Based on wm8350.c

 *

 * 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.

 *

 */

​

#include <linux/bug.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/lp3971.h>

#include <linux/slab.h>

​

struct lp3971 {

    struct device *dev;

    struct mutex io_lock;

    struct i2c_client *i2c;

};

​

static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);

static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);

​

#define LP3971_SYS_CONTROL1_REG 0x07

​

/* System control register 1 initial value,

   bits 4 and 5 are EPROM programmable */

#define SYS_CONTROL1_INIT_VAL 0x40

#define SYS_CONTROL1_INIT_MASK 0xCF

​

#define LP3971_BUCK_VOL_ENABLE_REG 0x10

#define LP3971_BUCK_VOL_CHANGE_REG 0x20

​

/*  Voltage control registers shift:

    LP3971_BUCK1 -> 0

    LP3971_BUCK2 -> 4

    LP3971_BUCK3 -> 6

*/

#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))

#define BUCK_VOL_CHANGE_FLAG_GO 0x01

#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02

#define BUCK_VOL_CHANGE_FLAG_MASK 0x03

​

#define LP3971_BUCK1_BASE 0x23

#define LP3971_BUCK2_BASE 0x29

#define LP3971_BUCK3_BASE 0x32

​

static const int buck_base_addr[] = {

    LP3971_BUCK1_BASE,

    LP3971_BUCK2_BASE,

    LP3971_BUCK3_BASE,

};

​

#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])