drivers/mfd/stmpe-i2c.c

   1 /*
   2  * ST Microelectronics MFD: stmpe's i2c client specific driver
   3  *
   4  * Copyright (C) ST-Ericsson SA 2010
   5  * Copyright (C) ST Microelectronics SA 2011
   6  *
   7  * License Terms: GNU General Public License, version 2
   8  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   9  * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics
  10  */
  11
  12 #include <linux/i2c.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/of_device.h>
  18 #include "stmpe.h"
  19
  20 static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
  21 {
  22         struct i2c_client *i2c = stmpe->client;
  23
  24         return i2c_smbus_read_byte_data(i2c, reg);
  25 }
  26
  27 static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
  28 {
  29         struct i2c_client *i2c = stmpe->client;
  30
  31         return i2c_smbus_write_byte_data(i2c, reg, val);
  32 }
  33
  34 static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
  35 {
  36         struct i2c_client *i2c = stmpe->client;
  37
  38         return i2c_smbus_read_i2c_block_data(i2c, reg, length, values);
  39 }
  40
  41 static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length,
  42                 const u8 *values)
  43 {
  44         struct i2c_client *i2c = stmpe->client;
  45
  46         return i2c_smbus_write_i2c_block_data(i2c, reg, length, values);
  47 }
  48
  49 static struct stmpe_client_info i2c_ci = {
  50         .read_byte = i2c_reg_read,
  51         .write_byte = i2c_reg_write,
  52         .read_block = i2c_block_read,
  53         .write_block = i2c_block_write,
  54 };
  55
  56 static const struct of_device_id stmpe_of_match[] = {
  57         { .compatible = "st,stmpe610", .data = (void *)STMPE610, },
  58         { .compatible = "st,stmpe801", .data = (void *)STMPE801, },
  59         { .compatible = "st,stmpe811", .data = (void *)STMPE811, },
  60         { .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
  61         { .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
  62         { .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
  63         { .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
  64         {},
  65 };
  66 MODULE_DEVICE_TABLE(of, stmpe_of_match);
  67
  68 static int
  69 stmpe_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
  70 {
  71         enum stmpe_partnum partnum;
  72         const struct of_device_id *of_id;
  73
  74         i2c_ci.data = (void *)id;
  75         i2c_ci.irq = i2c->irq;
  76         i2c_ci.client = i2c;
  77         i2c_ci.dev = &i2c->dev;
  78
  79         of_id = of_match_device(stmpe_of_match, &i2c->dev);
  80         if (!of_id) {
  81                 /*
  82                  * This happens when the I2C ID matches the node name
  83                  * but no real compatible string has been given.
  84                  */
  85                 dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
  86                 partnum = id->driver_data;
  87         } else
  88                 partnum = (enum stmpe_partnum)of_id->data;
  89
  90         return stmpe_probe(&i2c_ci, partnum);
  91 }
  92
  93 static int stmpe_i2c_remove(struct i2c_client *i2c)
  94 {
  95         struct stmpe *stmpe = dev_get_drvdata(&i2c->dev);
  96
  97         return stmpe_remove(stmpe);
  98 }
  99
 100 static const struct i2c_device_id stmpe_i2c_id[] = {
 101         { "stmpe610", STMPE610 },
 102         { "stmpe801", STMPE801 },
 103         { "stmpe811", STMPE811 },
 104         { "stmpe1601", STMPE1601 },
 105         { "stmpe1801", STMPE1801 },
 106         { "stmpe2401", STMPE2401 },
 107         { "stmpe2403", STMPE2403 },
 108         { }
 109 };
 110 MODULE_DEVICE_TABLE(i2c, stmpe_id);
 111
 112 static struct i2c_driver stmpe_i2c_driver = {
 113         .driver = {
 114                 .name = "stmpe-i2c",
 115                 .owner = THIS_MODULE,
 116 #ifdef CONFIG_PM
 117                 .pm = &stmpe_dev_pm_ops,
 118 #endif
 119                 .of_match_table = stmpe_of_match,
 120         },
 121         .probe          = stmpe_i2c_probe,
 122         .remove         = stmpe_i2c_remove,
 123         .id_table       = stmpe_i2c_id,
 124 };
 125
 126 static int __init stmpe_init(void)
 127 {
 128         return i2c_add_driver(&stmpe_i2c_driver);
 129 }
 130 subsys_initcall(stmpe_init);
 131
 132 static void __exit stmpe_exit(void)
 133 {
 134         i2c_del_driver(&stmpe_i2c_driver);
 135 }
 136 module_exit(stmpe_exit);
 137
 138 MODULE_LICENSE("GPL v2");
 139 MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
 140 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");