smsc-ece1099.c
2.58 KB
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/*
* TI SMSC MFD Driver
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
*
* Author: Sourav Poddar <sourav.poddar@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; GPL v2.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/irq.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/smsc.h>
#include <linux/of_platform.h>
static struct regmap_config smsc_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = SMSC_VEN_ID_H,
.cache_type = REGCACHE_RBTREE,
};
static int smsc_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct smsc *smsc;
int devid, rev, venid_l, venid_h;
int ret = 0;
smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
GFP_KERNEL);
if (!smsc) {
dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
return -ENOMEM;
}
smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
if (IS_ERR(smsc->regmap)) {
ret = PTR_ERR(smsc->regmap);
goto err;
}
i2c_set_clientdata(i2c, smsc);
smsc->dev = &i2c->dev;
#ifdef CONFIG_OF
of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
#endif
regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
devid, rev, (venid_h << 8) | venid_l);
ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
if (ret)
goto err;
#ifdef CONFIG_OF
if (i2c->dev.of_node)
ret = of_platform_populate(i2c->dev.of_node,
NULL, NULL, &i2c->dev);
#endif
err:
return ret;
}
static int smsc_i2c_remove(struct i2c_client *i2c)
{
struct smsc *smsc = i2c_get_clientdata(i2c);
mfd_remove_devices(smsc->dev);
return 0;
}
static const struct i2c_device_id smsc_i2c_id[] = {
{ "smscece1099", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
static struct i2c_driver smsc_i2c_driver = {
.driver = {
.name = "smsc",
.owner = THIS_MODULE,
},
.probe = smsc_i2c_probe,
.remove = smsc_i2c_remove,
.id_table = smsc_i2c_id,
};
module_i2c_driver(smsc_i2c_driver);
MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
MODULE_DESCRIPTION("SMSC chip multi-function driver");
MODULE_LICENSE("GPL v2");