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/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/slab.h>
  17 #include <linux/i2c.h>
  18 #include <linux/gpio.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/irq.h>
  21 #include <linux/regmap.h>
  22 #include <linux/err.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/smsc.h>
  25 #include <linux/of_platform.h>
  26
  27 static const struct regmap_config smsc_regmap_config = {
  28                 .reg_bits = 8,
  29                 .val_bits = 8,
  30                 .max_register = SMSC_VEN_ID_H,
  31                 .cache_type = REGCACHE_RBTREE,
  32 };
  33
  34 static int smsc_i2c_probe(struct i2c_client *i2c,
  35                         const struct i2c_device_id *id)
  36 {
  37         struct smsc *smsc;
  38         int devid, rev, venid_l, venid_h;
  39         int ret = 0;
  40
  41         smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
  42                                 GFP_KERNEL);
  43         if (!smsc) {
  44                 dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
  45                 return -ENOMEM;
  46         }
  47
  48         smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
  49         if (IS_ERR(smsc->regmap)) {
  50                 ret = PTR_ERR(smsc->regmap);
  51                 goto err;
  52         }
  53
  54         i2c_set_clientdata(i2c, smsc);
  55         smsc->dev = &i2c->dev;
  56
  57 #ifdef CONFIG_OF
  58         of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
  59 #endif
  60
  61         regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
  62         regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
  63         regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
  64         regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
  65
  66         dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
  67                 devid, rev, (venid_h << 8) | venid_l);
  68
  69         ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
  70         if (ret)
  71                 goto err;
  72
  73 #ifdef CONFIG_OF
  74         if (i2c->dev.of_node)
  75                 ret = of_platform_populate(i2c->dev.of_node,
  76                                            NULL, NULL, &i2c->dev);
  77 #endif
  78
  79 err:
  80         return ret;
  81 }
  82
  83 static int smsc_i2c_remove(struct i2c_client *i2c)
  84 {
  85         struct smsc *smsc = i2c_get_clientdata(i2c);
  86
  87         mfd_remove_devices(smsc->dev);
  88
  89         return 0;
  90 }
  91
  92 static const struct i2c_device_id smsc_i2c_id[] = {
  93         { "smscece1099", 0},
  94         {},
  95 };
  96 MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
  97
  98 static struct i2c_driver smsc_i2c_driver = {
  99         .driver = {
 100                    .name = "smsc",
 101                    .owner = THIS_MODULE,
 102         },
 103         .probe = smsc_i2c_probe,
 104         .remove = smsc_i2c_remove,
 105         .id_table = smsc_i2c_id,
 106 };
 107
 108 module_i2c_driver(smsc_i2c_driver);
 109
 110 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
 111 MODULE_DESCRIPTION("SMSC chip multi-function driver");
 112 MODULE_LICENSE("GPL v2");