smsc-ece1099.c

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/*
 * TI SMSC MFD Driver
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: Sourav Poddar <[email protected]>
 *
 *  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;  GPL v2.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/irq.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/smsc.h>
#include <linux/of_platform.h>

static struct regmap_config smsc_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .max_register = SMSC_VEN_ID_H,
        .cache_type = REGCACHE_RBTREE,
};

static int smsc_i2c_probe(struct i2c_client *i2c,
            const struct i2c_device_id *id)
{
    struct smsc *smsc;
    int devid, rev, venid_l, venid_h;
    int ret = 0;

    smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
                GFP_KERNEL);
    if (!smsc) {
        dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
        return -ENOMEM;
    }

    smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
    if (IS_ERR(smsc->regmap)) {
        ret = PTR_ERR(smsc->regmap);
        goto err;
    }

    i2c_set_clientdata(i2c, smsc);
    smsc->dev = &i2c->dev;

#ifdef CONFIG_OF
    of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
#endif

    regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
    regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
    regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
    regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);

    dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
        devid, rev, (venid_h << 8) | venid_l);

    ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
    if (ret)
        goto err;

#ifdef CONFIG_OF
    if (i2c->dev.of_node)
        ret = of_platform_populate(i2c->dev.of_node,
                       NULL, NULL, &i2c->dev);
#endif

err:
    return ret;
}

static int smsc_i2c_remove(struct i2c_client *i2c)
{
    struct smsc *smsc = i2c_get_clientdata(i2c);

    mfd_remove_devices(smsc->dev);

    return 0;
}

static const struct i2c_device_id smsc_i2c_id[] = {
    { "smscece1099", 0},
    {},
};
MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);

static struct i2c_driver smsc_i2c_driver = {
    .driver = {
           .name = "smsc",
           .owner = THIS_MODULE,
    },
    .probe = smsc_i2c_probe,
    .remove = smsc_i2c_remove,
    .id_table = smsc_i2c_id,
};

module_i2c_driver(smsc_i2c_driver);

MODULE_AUTHOR("Sourav Poddar <[email protected]>");
MODULE_DESCRIPTION("SMSC chip multi-function driver");
MODULE_LICENSE("GPL v2");