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/*
* Raspberry Pi Sense HAT core driver
* http://raspberrypi.org
*
* Copyright (C) 2015 Raspberry Pi
*
* Author: Serge Schneider
*
* 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; either version 2 of the License, or (at your
* option) any later version.
*
* This driver is based on wm8350 implementation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/mfd/rpisense/core.h>
#include <linux/slab.h>
static struct rpisense *rpisense;
static void rpisense_client_dev_register(struct rpisense *rpisense,
const char *name,
struct platform_device **pdev)
{
int ret;
*pdev = platform_device_alloc(name, -1);
if (*pdev == NULL) {
dev_err(rpisense->dev, "Failed to allocate %s\n", name);
return;
}
(*pdev)->dev.parent = rpisense->dev;
platform_set_drvdata(*pdev, rpisense);
ret = platform_device_add(*pdev);
if (ret != 0) {
dev_err(rpisense->dev, "Failed to register %s: %d\n",
name, ret);
platform_device_put(*pdev);
*pdev = NULL;
}
}
static int rpisense_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
int ret;
struct rpisense_js *rpisense_js;
rpisense = devm_kzalloc(&i2c->dev, sizeof(struct rpisense), GFP_KERNEL);
if (rpisense == NULL)
return -ENOMEM;
i2c_set_clientdata(i2c, rpisense);
rpisense->dev = &i2c->dev;
rpisense->i2c_client = i2c;
ret = rpisense_reg_read(rpisense, RPISENSE_WAI);
if (ret > 0) {
if (ret != 's')
return -EINVAL;
} else {
return ret;
}
ret = rpisense_reg_read(rpisense, RPISENSE_VER);
if (ret < 0)
return ret;
dev_info(rpisense->dev,
"Raspberry Pi Sense HAT firmware version %i\n", ret);
rpisense_js = &rpisense->joystick;
rpisense_js->keys_desc = devm_gpiod_get(&i2c->dev,
"keys-int", GPIOD_IN);
if (IS_ERR(rpisense_js->keys_desc)) {
dev_warn(&i2c->dev, "Failed to get keys-int descriptor.\n");
rpisense_js->keys_desc = gpio_to_desc(23);
if (rpisense_js->keys_desc == NULL) {
dev_err(&i2c->dev, "GPIO23 fallback failed.\n");
return PTR_ERR(rpisense_js->keys_desc);
}
}
rpisense_client_dev_register(rpisense, "rpi-sense-js",
&(rpisense->joystick.pdev));
rpisense_client_dev_register(rpisense, "rpi-sense-fb",
&(rpisense->framebuffer.pdev));
return 0;
}
static int rpisense_remove(struct i2c_client *i2c)
{
struct rpisense *rpisense = i2c_get_clientdata(i2c);
platform_device_unregister(rpisense->joystick.pdev);
return 0;
}
struct rpisense *rpisense_get_dev(void)
{
return rpisense;
}
EXPORT_SYMBOL_GPL(rpisense_get_dev);
s32 rpisense_reg_read(struct rpisense *rpisense, int reg)
{
int ret = i2c_smbus_read_byte_data(rpisense->i2c_client, reg);
if (ret < 0)
dev_err(rpisense->dev, "Read from reg %d failed\n", reg);
/* Due to the BCM270x I2C clock stretching bug, some values
* may have MSB set. Clear it to avoid incorrect values.
* */
return ret & 0x7F;
}
EXPORT_SYMBOL_GPL(rpisense_reg_read);
int rpisense_block_write(struct rpisense *rpisense, const char *buf, int count)
{
int ret = i2c_master_send(rpisense->i2c_client, buf, count);
if (ret < 0)
dev_err(rpisense->dev, "Block write failed\n");
return ret;
}
EXPORT_SYMBOL_GPL(rpisense_block_write);
static const struct i2c_device_id rpisense_i2c_id[] = {
{ "rpi-sense", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rpisense_i2c_id);
#ifdef CONFIG_OF
static const struct of_device_id rpisense_core_id[] = {
{ .compatible = "rpi,rpi-sense" },
{ },
};
MODULE_DEVICE_TABLE(of, rpisense_core_id);
#endif
static struct i2c_driver rpisense_driver = {
.driver = {
.name = "rpi-sense",
.owner = THIS_MODULE,
},
.probe = rpisense_probe,
.remove = rpisense_remove,
.id_table = rpisense_i2c_id,
};
module_i2c_driver(rpisense_driver);
MODULE_DESCRIPTION("Raspberry Pi Sense HAT core driver");
MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
MODULE_LICENSE("GPL");
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