LXR linux/drivers/mfd/smsc-ece1099.c

   1/*
   2 * TI SMSC MFD Driver
   3 *
   4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5 *
   6 * Author: Sourav Poddar <sourav.poddar@ti.com>
   7 *
   8 *  This program is free software; you can redistribute it and/or modify it
   9 *  under  the terms of the GNU General  Public License as published by the
  10 *  Free Software Foundation;  GPL v2.
  11 *
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/slab.h>
  16#include <linux/i2c.h>
  17#include <linux/gpio.h>
  18#include <linux/workqueue.h>
  19#include <linux/irq.h>
  20#include <linux/regmap.h>
  21#include <linux/err.h>
  22#include <linux/mfd/core.h>
  23#include <linux/mfd/smsc.h>
  24#include <linux/of_platform.h>
  25
  26static const struct regmap_config smsc_regmap_config = {
  27                .reg_bits = 8,
  28                .val_bits = 8,
  29                .max_register = SMSC_VEN_ID_H,
  30                .cache_type = REGCACHE_RBTREE,
  31};
  32
  33static int smsc_i2c_probe(struct i2c_client *i2c,
  34                        const struct i2c_device_id *id)
  35{
  36        struct smsc *smsc;
  37        int devid, rev, venid_l, venid_h;
  38        int ret;
  39
  40        smsc = devm_kzalloc(&i2c->dev, sizeof(*smsc), GFP_KERNEL);
  41        if (!smsc)
  42                return -ENOMEM;
  43
  44        smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
  45        if (IS_ERR(smsc->regmap))
  46                return PTR_ERR(smsc->regmap);
  47
  48        i2c_set_clientdata(i2c, smsc);
  49        smsc->dev = &i2c->dev;
  50
  51#ifdef CONFIG_OF
  52        of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
  53#endif
  54
  55        regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
  56        regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
  57        regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
  58        regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
  59
  60        dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
  61                devid, rev, (venid_h << 8) | venid_l);
  62
  63        ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
  64        if (ret)
  65                return ret;
  66
  67#ifdef CONFIG_OF
  68        if (i2c->dev.of_node)
  69                ret = devm_of_platform_populate(&i2c->dev);
  70#endif
  71
  72        return ret;
  73}
  74
  75static const struct i2c_device_id smsc_i2c_id[] = {
  76        { "smscece1099", 0},
  77        {},
  78};
  79
  80static struct i2c_driver smsc_i2c_driver = {
  81        .driver = {
  82                   .name = "smsc",
  83        },
  84        .probe = smsc_i2c_probe,
  85        .id_table = smsc_i2c_id,
  86};
  87builtin_i2c_driver(smsc_i2c_driver);
  88