linux/drivers/mfd/stmpe-i2c.c
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   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 <viresh.linux@gmail.com> 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
  20static 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
  27static 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
  34static 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
  41static 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
  49static 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
  56static 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};
  66MODULE_DEVICE_TABLE(of, stmpe_of_match);
  67
  68static int
  69stmpe_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
  93static 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
 100static 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};
 110MODULE_DEVICE_TABLE(i2c, stmpe_id);
 111
 112static 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
 126static int __init stmpe_init(void)
 127{
 128        return i2c_add_driver(&stmpe_i2c_driver);
 129}
 130subsys_initcall(stmpe_init);
 131
 132static void __exit stmpe_exit(void)
 133{
 134        i2c_del_driver(&stmpe_i2c_driver);
 135}
 136module_exit(stmpe_exit);
 137
 138MODULE_LICENSE("GPL v2");
 139MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
 140MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");
 141
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