linux/drivers/gpio/gpio-mc9s08dz60.c
Paul Gortmaker 0de6a80de1 gpio: mc9s08dz60: make explicitly non-modular
The Kconfig currently controlling compilation of this code is:

drivers/gpio/Kconfig:config GPIO_MC9S08DZ60
drivers/gpio/Kconfig:   bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_i2c_driver() uses the same init level priority as
builtin_i2c_driver() the init ordering remains unchanged with
this commit.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Wu Guoxing <b39297@freescale.com>
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-03-31 15:02:09 +02:00

122 lines
3.0 KiB
C

/*
* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
*
* Author: Wu Guoxing <b39297@freescale.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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#define GPIO_GROUP_NUM 2
#define GPIO_NUM_PER_GROUP 8
#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
struct mc9s08dz60 {
struct i2c_client *client;
struct gpio_chip chip;
};
static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
{
*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
*bit = offset % GPIO_NUM_PER_GROUP;
}
static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
{
u8 reg, bit;
s32 value;
struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
value = i2c_smbus_read_byte_data(mc9s->client, reg);
return (value >= 0) ? (value >> bit) & 0x1 : 0;
}
static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
{
u8 reg, bit;
s32 value;
mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
value = i2c_smbus_read_byte_data(mc9s->client, reg);
if (value >= 0) {
if (val)
value |= 1 << bit;
else
value &= ~(1 << bit);
return i2c_smbus_write_byte_data(mc9s->client, reg, value);
} else
return value;
}
static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
{
struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
mc9s08dz60_set(mc9s, offset, val);
}
static int mc9s08dz60_direction_output(struct gpio_chip *gc,
unsigned offset, int val)
{
struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
return mc9s08dz60_set(mc9s, offset, val);
}
static int mc9s08dz60_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mc9s08dz60 *mc9s;
mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
if (!mc9s)
return -ENOMEM;
mc9s->chip.label = client->name;
mc9s->chip.base = -1;
mc9s->chip.parent = &client->dev;
mc9s->chip.owner = THIS_MODULE;
mc9s->chip.ngpio = GPIO_NUM;
mc9s->chip.can_sleep = true;
mc9s->chip.get = mc9s08dz60_get_value;
mc9s->chip.set = mc9s08dz60_set_value;
mc9s->chip.direction_output = mc9s08dz60_direction_output;
mc9s->client = client;
i2c_set_clientdata(client, mc9s);
return devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s);
}
static const struct i2c_device_id mc9s08dz60_id[] = {
{"mc9s08dz60", 0},
{},
};
static struct i2c_driver mc9s08dz60_i2c_driver = {
.driver = {
.name = "mc9s08dz60",
},
.probe = mc9s08dz60_probe,
.id_table = mc9s08dz60_id,
};
builtin_i2c_driver(mc9s08dz60_i2c_driver);