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
  26 static 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
  33 static 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(struct smsc),
  41                                 GFP_KERNEL);
  42         if (!smsc) {
  43                 dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
  44                 return -ENOMEM;
  45         }
  46
  47         smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
  48         if (IS_ERR(smsc->regmap))
  49                 return PTR_ERR(smsc->regmap);
  50
  51         i2c_set_clientdata(i2c, smsc);
  52         smsc->dev = &i2c->dev;
  53
  54 #ifdef CONFIG_OF
  55         of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
  56 #endif
  57
  58         regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
  59         regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
  60         regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
  61         regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
  62
  63         dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
  64                 devid, rev, (venid_h << 8) | venid_l);
  65
  66         ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
  67         if (ret)
  68                 return ret;
  69
  70 #ifdef CONFIG_OF
  71         if (i2c->dev.of_node)
  72                 ret = of_platform_populate(i2c->dev.of_node,
  73                                            NULL, NULL, &i2c->dev);
  74 #endif
  75
  76         return ret;
  77 }
  78
  79 static const struct i2c_device_id smsc_i2c_id[] = {
  80         { "smscece1099", 0},
  81         {},
  82 };
  83
  84 static struct i2c_driver smsc_i2c_driver = {
  85         .driver = {
  86                    .name = "smsc",
  87         },
  88         .probe = smsc_i2c_probe,
  89         .id_table = smsc_i2c_id,
  90 };
  91 builtin_i2c_driver(smsc_i2c_driver);