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;
  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                 return PTR_ERR(smsc->regmap);
  51
  52         i2c_set_clientdata(i2c, smsc);
  53         smsc->dev = &i2c->dev;
  54
  55 #ifdef CONFIG_OF
  56         of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
  57 #endif
  58
  59         regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
  60         regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
  61         regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
  62         regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
  63
  64         dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
  65                 devid, rev, (venid_h << 8) | venid_l);
  66
  67         ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
  68         if (ret)
  69                 return ret;
  70
  71 #ifdef CONFIG_OF
  72         if (i2c->dev.of_node)
  73                 ret = of_platform_populate(i2c->dev.of_node,
  74                                            NULL, NULL, &i2c->dev);
  75 #endif
  76
  77         return ret;
  78 }
  79
  80 static const struct i2c_device_id smsc_i2c_id[] = {
  81         { "smscece1099", 0},
  82         {},
  83 };
  84 MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
  85
  86 static struct i2c_driver smsc_i2c_driver = {
  87         .driver = {
  88                    .name = "smsc",
  89         },
  90         .probe = smsc_i2c_probe,
  91         .id_table = smsc_i2c_id,
  92 };
  93
  94 module_i2c_driver(smsc_i2c_driver);
  95
  96 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
  97 MODULE_DESCRIPTION("SMSC chip multi-function driver");
  98 MODULE_LICENSE("GPL v2");