linux-imx

/*

 * max8660.c  --  Voltage regulation for the Maxim 8660/8661

 *

 * based on max1586.c and wm8400-regulator.c

 *

 * Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the Free

 * Software Foundation; version 2 of the License.

 *

 * 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., 59 Temple

 * Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Some info:

 *

 * Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf

 *

 * This chip is a bit nasty because it is a write-only device. Thus, the driver

 * uses shadow registers to keep track of its values. The main problem appears

 * to be the initialization: When Linux boots up, we cannot know if the chip is

 * in the default state or not, so we would have to pass such information in

 * platform_data. As this adds a bit of complexity to the driver, this is left

 * out for now until it is really needed.

 *

 * [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.

 *

 * If the driver is feature complete, it might be worth to check if one set of

 * functions for V3-V7 is sufficient. For maximum flexibility during

 * development, they are separated for now.

 *

 */

​

#include <linux/module.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/platform_device.h>

#include <linux/regulator/driver.h>

#include <linux/slab.h>

#include <linux/regulator/max8660.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/regulator/of_regulator.h>

​

#define MAX8660_DCDC_MIN_UV  725000

#define MAX8660_DCDC_MAX_UV 1800000

#define MAX8660_DCDC_STEP     25000

#define MAX8660_DCDC_MAX_SEL    0x2b

​

#define MAX8660_LDO5_MIN_UV 1700000

#define MAX8660_LDO5_MAX_UV 2000000

#define MAX8660_LDO5_STEP     25000

#define MAX8660_LDO5_MAX_SEL    0x0c

​

#define MAX8660_LDO67_MIN_UV    1800000

#define MAX8660_LDO67_MAX_UV    3300000

#define MAX8660_LDO67_STEP   100000

#define MAX8660_LDO67_MAX_SEL   0x0f

​

enum {

    MAX8660_OVER1,

    MAX8660_OVER2,

    MAX8660_VCC1,

    MAX8660_ADTV1,

    MAX8660_ADTV2,

    MAX8660_SDTV1,

    MAX8660_SDTV2,

    MAX8660_MDTV1,

    MAX8660_MDTV2,

    MAX8660_L12VCR,

    MAX8660_FPWM,

    MAX8660_N_REGS, /* not a real register */

};

​

struct max8660 {

    struct i2c_client *client;

    u8 shadow_regs[MAX8660_N_REGS];     /* as chip is write only */

};

​

static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)

{

    static const u8 max8660_addresses[MAX8660_N_REGS] = {

     0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80

    };

​

    int ret;