gpio: reorganize drivers

Sort the gpio makefile and enforce the naming convention gpio-*.c for
gpio drivers.

v2: cleaned up filenames in Kconfig and comment blocks
v3: fixup use of BASIC_MMIO to GENERIC_GPIO for mxc

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 0 insertions, 369 deletions

diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c
deleted file mode 100644
index 879b473..0000000
--- a/drivers/gpio/pcf857x.c
+++ /dev/null
@@ -1,369 +0,0 @@
-/*
- * pcf857x - driver for pcf857x, pca857x, and pca967x I2C GPIO expanders
- *
- * Copyright (C) 2007 David Brownell
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/i2c.h>
-#include <linux/i2c/pcf857x.h>
-
-
-static const struct i2c_device_id pcf857x_id[] = {
-	{ "pcf8574", 8 },
-	{ "pcf8574a", 8 },
-	{ "pca8574", 8 },
-	{ "pca9670", 8 },
-	{ "pca9672", 8 },
-	{ "pca9674", 8 },
-	{ "pcf8575", 16 },
-	{ "pca8575", 16 },
-	{ "pca9671", 16 },
-	{ "pca9673", 16 },
-	{ "pca9675", 16 },
-	{ "max7328", 8 },
-	{ "max7329", 8 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, pcf857x_id);
-
-/*
- * The pcf857x, pca857x, and pca967x chips only expose one read and one
- * write register.  Writing a "one" bit (to match the reset state) lets
- * that pin be used as an input; it's not an open-drain model, but acts
- * a bit like one.  This is described as "quasi-bidirectional"; read the
- * chip documentation for details.
- *
- * Many other I2C GPIO expander chips (like the pca953x models) have
- * more complex register models and more conventional circuitry using
- * push/pull drivers.  They often use the same 0x20..0x27 addresses as
- * pcf857x parts, making the "legacy" I2C driver model problematic.
- */
-struct pcf857x {
-	struct gpio_chip	chip;
-	struct i2c_client	*client;
-	struct mutex		lock;		/* protect 'out' */
-	unsigned		out;		/* software latch */
-};
-
-/*-------------------------------------------------------------------------*/
-
-/* Talk to 8-bit I/O expander */
-
-static int pcf857x_input8(struct gpio_chip *chip, unsigned offset)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	int		status;
-
-	mutex_lock(&gpio->lock);
-	gpio->out |= (1 << offset);
-	status = i2c_smbus_write_byte(gpio->client, gpio->out);
-	mutex_unlock(&gpio->lock);
-
-	return status;
-}
-
-static int pcf857x_get8(struct gpio_chip *chip, unsigned offset)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	s32		value;
-
-	value = i2c_smbus_read_byte(gpio->client);
-	return (value < 0) ? 0 : (value & (1 << offset));
-}
-
-static int pcf857x_output8(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	unsigned	bit = 1 << offset;
-	int		status;
-
-	mutex_lock(&gpio->lock);
-	if (value)
-		gpio->out |= bit;
-	else
-		gpio->out &= ~bit;
-	status = i2c_smbus_write_byte(gpio->client, gpio->out);
-	mutex_unlock(&gpio->lock);
-
-	return status;
-}
-
-static void pcf857x_set8(struct gpio_chip *chip, unsigned offset, int value)
-{
-	pcf857x_output8(chip, offset, value);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* Talk to 16-bit I/O expander */
-
-static int i2c_write_le16(struct i2c_client *client, u16 word)
-{
-	u8 buf[2] = { word & 0xff, word >> 8, };
-	int status;
-
-	status = i2c_master_send(client, buf, 2);
-	return (status < 0) ? status : 0;
-}
-
-static int i2c_read_le16(struct i2c_client *client)
-{
-	u8 buf[2];
-	int status;
-
-	status = i2c_master_recv(client, buf, 2);
-	if (status < 0)
-		return status;
-	return (buf[1] << 8) | buf[0];
-}
-
-static int pcf857x_input16(struct gpio_chip *chip, unsigned offset)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	int		status;
-
-	mutex_lock(&gpio->lock);
-	gpio->out |= (1 << offset);
-	status = i2c_write_le16(gpio->client, gpio->out);
-	mutex_unlock(&gpio->lock);
-
-	return status;
-}
-
-static int pcf857x_get16(struct gpio_chip *chip, unsigned offset)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	int		value;
-
-	value = i2c_read_le16(gpio->client);
-	return (value < 0) ? 0 : (value & (1 << offset));
-}
-
-static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
-	unsigned	bit = 1 << offset;
-	int		status;
-
-	mutex_lock(&gpio->lock);
-	if (value)
-		gpio->out |= bit;
-	else
-		gpio->out &= ~bit;
-	status = i2c_write_le16(gpio->client, gpio->out);
-	mutex_unlock(&gpio->lock);
-
-	return status;
-}
-
-static void pcf857x_set16(struct gpio_chip *chip, unsigned offset, int value)
-{
-	pcf857x_output16(chip, offset, value);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int pcf857x_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
-{
-	struct pcf857x_platform_data	*pdata;
-	struct pcf857x			*gpio;
-	int				status;
-
-	pdata = client->dev.platform_data;
-	if (!pdata) {
-		dev_dbg(&client->dev, "no platform data\n");
-	}
-
-	/* Allocate, initialize, and register this gpio_chip. */
-	gpio = kzalloc(sizeof *gpio, GFP_KERNEL);
-	if (!gpio)
-		return -ENOMEM;
-
-	mutex_init(&gpio->lock);
-
-	gpio->chip.base = pdata ? pdata->gpio_base : -1;
-	gpio->chip.can_sleep = 1;
-	gpio->chip.dev = &client->dev;
-	gpio->chip.owner = THIS_MODULE;
-
-	/* NOTE:  the OnSemi jlc1562b is also largely compatible with
-	 * these parts, notably for output.  It has a low-resolution
-	 * DAC instead of pin change IRQs; and its inputs can be the
-	 * result of comparators.
-	 */
-
-	/* 8574 addresses are 0x20..0x27; 8574a uses 0x38..0x3f;
-	 * 9670, 9672, 9764, and 9764a use quite a variety.
-	 *
-	 * NOTE: we don't distinguish here between *4 and *4a parts.
-	 */
-	gpio->chip.ngpio = id->driver_data;
-	if (gpio->chip.ngpio == 8) {
-		gpio->chip.direction_input = pcf857x_input8;
-		gpio->chip.get = pcf857x_get8;
-		gpio->chip.direction_output = pcf857x_output8;
-		gpio->chip.set = pcf857x_set8;
-
-		if (!i2c_check_functionality(client->adapter,
-				I2C_FUNC_SMBUS_BYTE))
-			status = -EIO;
-
-		/* fail if there's no chip present */
-		else
-			status = i2c_smbus_read_byte(client);
-
-	/* '75/'75c addresses are 0x20..0x27, just like the '74;
-	 * the '75c doesn't have a current source pulling high.
-	 * 9671, 9673, and 9765 use quite a variety of addresses.
-	 *
-	 * NOTE: we don't distinguish here between '75 and '75c parts.
-	 */
-	} else if (gpio->chip.ngpio == 16) {
-		gpio->chip.direction_input = pcf857x_input16;
-		gpio->chip.get = pcf857x_get16;
-		gpio->chip.direction_output = pcf857x_output16;
-		gpio->chip.set = pcf857x_set16;
-
-		if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
-			status = -EIO;
-
-		/* fail if there's no chip present */
-		else
-			status = i2c_read_le16(client);
-
-	} else {
-		dev_dbg(&client->dev, "unsupported number of gpios\n");
-		status = -EINVAL;
-	}
-
-	if (status < 0)
-		goto fail;
-
-	gpio->chip.label = client->name;
-
-	gpio->client = client;
-	i2c_set_clientdata(client, gpio);
-
-	/* NOTE:  these chips have strange "quasi-bidirectional" I/O pins.
-	 * We can't actually know whether a pin is configured (a) as output
-	 * and driving the signal low, or (b) as input and reporting a low
-	 * value ... without knowing the last value written since the chip
-	 * came out of reset (if any).  We can't read the latched output.
-	 *
-	 * In short, the only reliable solution for setting up pin direction
-	 * is to do it explicitly.  The setup() method can do that, but it
-	 * may cause transient glitching since it can't know the last value
-	 * written (some pins may need to be driven low).
-	 *
-	 * Using pdata->n_latch avoids that trouble.  When left initialized
-	 * to zero, our software copy of the "latch" then matches the chip's
-	 * all-ones reset state.  Otherwise it flags pins to be driven low.
-	 */
-	gpio->out = pdata ? ~pdata->n_latch : ~0;
-
-	status = gpiochip_add(&gpio->chip);
-	if (status < 0)
-		goto fail;
-
-	/* NOTE: these chips can issue "some pin-changed" IRQs, which we
-	 * don't yet even try to use.  Among other issues, the relevant
-	 * genirq state isn't available to modular drivers; and most irq
-	 * methods can't be called from sleeping contexts.
-	 */
-
-	dev_info(&client->dev, "gpios %d..%d on a %s%s\n",
-			gpio->chip.base,
-			gpio->chip.base + gpio->chip.ngpio - 1,
-			client->name,
-			client->irq ? " (irq ignored)" : "");
-
-	/* Let platform code set up the GPIOs and their users.
-	 * Now is the first time anyone could use them.
-	 */
-	if (pdata && pdata->setup) {
-		status = pdata->setup(client,
-				gpio->chip.base, gpio->chip.ngpio,
-				pdata->context);
-		if (status < 0)
-			dev_warn(&client->dev, "setup --> %d\n", status);
-	}
-
-	return 0;
-
-fail:
-	dev_dbg(&client->dev, "probe error %d for '%s'\n",
-			status, client->name);
-	kfree(gpio);
-	return status;
-}
-
-static int pcf857x_remove(struct i2c_client *client)
-{
-	struct pcf857x_platform_data	*pdata = client->dev.platform_data;
-	struct pcf857x			*gpio = i2c_get_clientdata(client);
-	int				status = 0;
-
-	if (pdata && pdata->teardown) {
-		status = pdata->teardown(client,
-				gpio->chip.base, gpio->chip.ngpio,
-				pdata->context);
-		if (status < 0) {
-			dev_err(&client->dev, "%s --> %d\n",
-					"teardown", status);
-			return status;
-		}
-	}
-
-	status = gpiochip_remove(&gpio->chip);
-	if (status == 0)
-		kfree(gpio);
-	else
-		dev_err(&client->dev, "%s --> %d\n", "remove", status);
-	return status;
-}
-
-static struct i2c_driver pcf857x_driver = {
-	.driver = {
-		.name	= "pcf857x",
-		.owner	= THIS_MODULE,
-	},
-	.probe	= pcf857x_probe,
-	.remove	= pcf857x_remove,
-	.id_table = pcf857x_id,
-};
-
-static int __init pcf857x_init(void)
-{
-	return i2c_add_driver(&pcf857x_driver);
-}
-/* register after i2c postcore initcall and before
- * subsys initcalls that may rely on these GPIOs
- */
-subsys_initcall(pcf857x_init);
-
-static void __exit pcf857x_exit(void)
-{
-	i2c_del_driver(&pcf857x_driver);
-}
-module_exit(pcf857x_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Brownell");