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, 680 deletions

diff --git a/drivers/gpio/sx150x.c b/drivers/gpio/sx150x.c
deleted file mode 100644
index a4f73534394e..000000000000
--- a/drivers/gpio/sx150x.c
+++ /dev/null
@@ -1,680 +0,0 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-#include <linux/gpio.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <linux/workqueue.h>
-#include <linux/i2c/sx150x.h>
-
-#define NO_UPDATE_PENDING	-1
-
-struct sx150x_device_data {
-	u8 reg_pullup;
-	u8 reg_pulldn;
-	u8 reg_drain;
-	u8 reg_polarity;
-	u8 reg_dir;
-	u8 reg_data;
-	u8 reg_irq_mask;
-	u8 reg_irq_src;
-	u8 reg_sense;
-	u8 reg_clock;
-	u8 reg_misc;
-	u8 reg_reset;
-	u8 ngpios;
-};
-
-struct sx150x_chip {
-	struct gpio_chip                 gpio_chip;
-	struct i2c_client               *client;
-	const struct sx150x_device_data *dev_cfg;
-	int                              irq_summary;
-	int                              irq_base;
-	int				 irq_update;
-	u32                              irq_sense;
-	u32				 irq_masked;
-	u32				 dev_sense;
-	u32				 dev_masked;
-	struct irq_chip                  irq_chip;
-	struct mutex                     lock;
-};
-
-static const struct sx150x_device_data sx150x_devices[] = {
-	[0] = { /* sx1508q */
-		.reg_pullup   = 0x03,
-		.reg_pulldn   = 0x04,
-		.reg_drain    = 0x05,
-		.reg_polarity = 0x06,
-		.reg_dir      = 0x07,
-		.reg_data     = 0x08,
-		.reg_irq_mask = 0x09,
-		.reg_irq_src  = 0x0c,
-		.reg_sense    = 0x0b,
-		.reg_clock    = 0x0f,
-		.reg_misc     = 0x10,
-		.reg_reset    = 0x7d,
-		.ngpios       = 8
-	},
-	[1] = { /* sx1509q */
-		.reg_pullup   = 0x07,
-		.reg_pulldn   = 0x09,
-		.reg_drain    = 0x0b,
-		.reg_polarity = 0x0d,
-		.reg_dir      = 0x0f,
-		.reg_data     = 0x11,
-		.reg_irq_mask = 0x13,
-		.reg_irq_src  = 0x19,
-		.reg_sense    = 0x17,
-		.reg_clock    = 0x1e,
-		.reg_misc     = 0x1f,
-		.reg_reset    = 0x7d,
-		.ngpios       = 16
-	},
-};
-
-static const struct i2c_device_id sx150x_id[] = {
-	{"sx1508q", 0},
-	{"sx1509q", 1},
-	{}
-};
-MODULE_DEVICE_TABLE(i2c, sx150x_id);
-
-static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
-{
-	s32 err = i2c_smbus_write_byte_data(client, reg, val);
-
-	if (err < 0)
-		dev_warn(&client->dev,
-			"i2c write fail: can't write %02x to %02x: %d\n",
-			val, reg, err);
-	return err;
-}
-
-static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
-{
-	s32 err = i2c_smbus_read_byte_data(client, reg);
-
-	if (err >= 0)
-		*val = err;
-	else
-		dev_warn(&client->dev,
-			"i2c read fail: can't read from %02x: %d\n",
-			reg, err);
-	return err;
-}
-
-static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
-{
-	return (chip->dev_cfg->ngpios == offset);
-}
-
-/*
- * These utility functions solve the common problem of locating and setting
- * configuration bits.  Configuration bits are grouped into registers
- * whose indexes increase downwards.  For example, with eight-bit registers,
- * sixteen gpios would have their config bits grouped in the following order:
- * REGISTER N-1 [ f e d c b a 9 8 ]
- *          N   [ 7 6 5 4 3 2 1 0 ]
- *
- * For multi-bit configurations, the pattern gets wider:
- * REGISTER N-3 [ f f e e d d c c ]
- *          N-2 [ b b a a 9 9 8 8 ]
- *          N-1 [ 7 7 6 6 5 5 4 4 ]
- *          N   [ 3 3 2 2 1 1 0 0 ]
- *
- * Given the address of the starting register 'N', the index of the gpio
- * whose configuration we seek to change, and the width in bits of that
- * configuration, these functions allow us to locate the correct
- * register and mask the correct bits.
- */
-static inline void sx150x_find_cfg(u8 offset, u8 width,
-				u8 *reg, u8 *mask, u8 *shift)
-{
-	*reg   -= offset * width / 8;
-	*mask   = (1 << width) - 1;
-	*shift  = (offset * width) % 8;
-	*mask <<= *shift;
-}
-
-static s32 sx150x_write_cfg(struct sx150x_chip *chip,
-			u8 offset, u8 width, u8 reg, u8 val)
-{
-	u8  mask;
-	u8  data;
-	u8  shift;
-	s32 err;
-
-	sx150x_find_cfg(offset, width, &reg, &mask, &shift);
-	err = sx150x_i2c_read(chip->client, reg, &data);
-	if (err < 0)
-		return err;
-
-	data &= ~mask;
-	data |= (val << shift) & mask;
-	return sx150x_i2c_write(chip->client, reg, data);
-}
-
-static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
-{
-	u8  reg = chip->dev_cfg->reg_data;
-	u8  mask;
-	u8  data;
-	u8  shift;
-	s32 err;
-
-	sx150x_find_cfg(offset, 1, &reg, &mask, &shift);
-	err = sx150x_i2c_read(chip->client, reg, &data);
-	if (err >= 0)
-		err = (data & mask) != 0 ? 1 : 0;
-
-	return err;
-}
-
-static void sx150x_set_oscio(struct sx150x_chip *chip, int val)
-{
-	sx150x_i2c_write(chip->client,
-			chip->dev_cfg->reg_clock,
-			(val ? 0x1f : 0x10));
-}
-
-static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
-{
-	sx150x_write_cfg(chip,
-			offset,
-			1,
-			chip->dev_cfg->reg_data,
-			(val ? 1 : 0));
-}
-
-static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
-{
-	return sx150x_write_cfg(chip,
-				offset,
-				1,
-				chip->dev_cfg->reg_dir,
-				1);
-}
-
-static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
-{
-	int err;
-
-	err = sx150x_write_cfg(chip,
-			offset,
-			1,
-			chip->dev_cfg->reg_data,
-			(val ? 1 : 0));
-	if (err >= 0)
-		err = sx150x_write_cfg(chip,
-				offset,
-				1,
-				chip->dev_cfg->reg_dir,
-				0);
-	return err;
-}
-
-static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
-{
-	struct sx150x_chip *chip;
-	int status = -EINVAL;
-
-	chip = container_of(gc, struct sx150x_chip, gpio_chip);
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_get_io(chip, offset);
-		mutex_unlock(&chip->lock);
-	}
-
-	return status;
-}
-
-static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
-{
-	struct sx150x_chip *chip;
-
-	chip = container_of(gc, struct sx150x_chip, gpio_chip);
-
-	mutex_lock(&chip->lock);
-	if (offset_is_oscio(chip, offset))
-		sx150x_set_oscio(chip, val);
-	else
-		sx150x_set_io(chip, offset, val);
-	mutex_unlock(&chip->lock);
-}
-
-static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
-{
-	struct sx150x_chip *chip;
-	int status = -EINVAL;
-
-	chip = container_of(gc, struct sx150x_chip, gpio_chip);
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_io_input(chip, offset);
-		mutex_unlock(&chip->lock);
-	}
-	return status;
-}
-
-static int sx150x_gpio_direction_output(struct gpio_chip *gc,
-					unsigned offset,
-					int val)
-{
-	struct sx150x_chip *chip;
-	int status = 0;
-
-	chip = container_of(gc, struct sx150x_chip, gpio_chip);
-
-	if (!offset_is_oscio(chip, offset)) {
-		mutex_lock(&chip->lock);
-		status = sx150x_io_output(chip, offset, val);
-		mutex_unlock(&chip->lock);
-	}
-	return status;
-}
-
-static int sx150x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
-{
-	struct sx150x_chip *chip;
-
-	chip = container_of(gc, struct sx150x_chip, gpio_chip);
-
-	if (offset >= chip->dev_cfg->ngpios)
-		return -EINVAL;
-
-	if (chip->irq_base < 0)
-		return -EINVAL;
-
-	return chip->irq_base + offset;
-}
-
-static void sx150x_irq_mask(struct irq_data *d)
-{
-	struct irq_chip *ic = irq_data_get_irq_chip(d);
-	struct sx150x_chip *chip;
-	unsigned n;
-
-	chip = container_of(ic, struct sx150x_chip, irq_chip);
-	n = d->irq - chip->irq_base;
-	chip->irq_masked |= (1 << n);
-	chip->irq_update = n;
-}
-
-static void sx150x_irq_unmask(struct irq_data *d)
-{
-	struct irq_chip *ic = irq_data_get_irq_chip(d);
-	struct sx150x_chip *chip;
-	unsigned n;
-
-	chip = container_of(ic, struct sx150x_chip, irq_chip);
-	n = d->irq - chip->irq_base;
-
-	chip->irq_masked &= ~(1 << n);
-	chip->irq_update = n;
-}
-
-static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
-{
-	struct irq_chip *ic = irq_data_get_irq_chip(d);
-	struct sx150x_chip *chip;
-	unsigned n, val = 0;
-
-	if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
-		return -EINVAL;
-
-	chip = container_of(ic, struct sx150x_chip, irq_chip);
-	n = d->irq - chip->irq_base;
-
-	if (flow_type & IRQ_TYPE_EDGE_RISING)
-		val |= 0x1;
-	if (flow_type & IRQ_TYPE_EDGE_FALLING)
-		val |= 0x2;
-
-	chip->irq_sense &= ~(3UL << (n * 2));
-	chip->irq_sense |= val << (n * 2);
-	chip->irq_update = n;
-	return 0;
-}
-
-static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
-{
-	struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
-	unsigned nhandled = 0;
-	unsigned sub_irq;
-	unsigned n;
-	s32 err;
-	u8 val;
-	int i;
-
-	for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
-		err = sx150x_i2c_read(chip->client,
-				      chip->dev_cfg->reg_irq_src - i,
-				      &val);
-		if (err < 0)
-			continue;
-
-		sx150x_i2c_write(chip->client,
-				chip->dev_cfg->reg_irq_src - i,
-				val);
-		for (n = 0; n < 8; ++n) {
-			if (val & (1 << n)) {
-				sub_irq = chip->irq_base + (i * 8) + n;
-				handle_nested_irq(sub_irq);
-				++nhandled;
-			}
-		}
-	}
-
-	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
-}
-
-static void sx150x_irq_bus_lock(struct irq_data *d)
-{
-	struct irq_chip *ic = irq_data_get_irq_chip(d);
-	struct sx150x_chip *chip;
-
-	chip = container_of(ic, struct sx150x_chip, irq_chip);
-
-	mutex_lock(&chip->lock);
-}
-
-static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
-{
-	struct irq_chip *ic = irq_data_get_irq_chip(d);
-	struct sx150x_chip *chip;
-	unsigned n;
-
-	chip = container_of(ic, struct sx150x_chip, irq_chip);
-
-	if (chip->irq_update == NO_UPDATE_PENDING)
-		goto out;
-
-	n = chip->irq_update;
-	chip->irq_update = NO_UPDATE_PENDING;
-
-	/* Avoid updates if nothing changed */
-	if (chip->dev_sense == chip->irq_sense &&
-	    chip->dev_sense == chip->irq_masked)
-		goto out;
-
-	chip->dev_sense = chip->irq_sense;
-	chip->dev_masked = chip->irq_masked;
-
-	if (chip->irq_masked & (1 << n)) {
-		sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
-		sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
-	} else {
-		sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
-		sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
-				 chip->irq_sense >> (n * 2));
-	}
-out:
-	mutex_unlock(&chip->lock);
-}
-
-static void sx150x_init_chip(struct sx150x_chip *chip,
-			struct i2c_client *client,
-			kernel_ulong_t driver_data,
-			struct sx150x_platform_data *pdata)
-{
-	mutex_init(&chip->lock);
-
-	chip->client                     = client;
-	chip->dev_cfg                    = &sx150x_devices[driver_data];
-	chip->gpio_chip.label            = client->name;
-	chip->gpio_chip.direction_input  = sx150x_gpio_direction_input;
-	chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
-	chip->gpio_chip.get              = sx150x_gpio_get;
-	chip->gpio_chip.set              = sx150x_gpio_set;
-	chip->gpio_chip.to_irq           = sx150x_gpio_to_irq;
-	chip->gpio_chip.base             = pdata->gpio_base;
-	chip->gpio_chip.can_sleep        = 1;
-	chip->gpio_chip.ngpio            = chip->dev_cfg->ngpios;
-	if (pdata->oscio_is_gpo)
-		++chip->gpio_chip.ngpio;
-
-	chip->irq_chip.name                = client->name;
-	chip->irq_chip.irq_mask            = sx150x_irq_mask;
-	chip->irq_chip.irq_unmask          = sx150x_irq_unmask;
-	chip->irq_chip.irq_set_type        = sx150x_irq_set_type;
-	chip->irq_chip.irq_bus_lock        = sx150x_irq_bus_lock;
-	chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
-	chip->irq_summary                  = -1;
-	chip->irq_base                     = -1;
-	chip->irq_masked                   = ~0;
-	chip->irq_sense                    = 0;
-	chip->dev_masked                   = ~0;
-	chip->dev_sense                    = 0;
-	chip->irq_update		   = NO_UPDATE_PENDING;
-}
-
-static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
-{
-	int err = 0;
-	unsigned n;
-
-	for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
-		err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
-	return err;
-}
-
-static int sx150x_reset(struct sx150x_chip *chip)
-{
-	int err;
-
-	err = i2c_smbus_write_byte_data(chip->client,
-					chip->dev_cfg->reg_reset,
-					0x12);
-	if (err < 0)
-		return err;
-
-	err = i2c_smbus_write_byte_data(chip->client,
-					chip->dev_cfg->reg_reset,
-					0x34);
-	return err;
-}
-
-static int sx150x_init_hw(struct sx150x_chip *chip,
-			struct sx150x_platform_data *pdata)
-{
-	int err = 0;
-
-	if (pdata->reset_during_probe) {
-		err = sx150x_reset(chip);
-		if (err < 0)
-			return err;
-	}
-
-	err = sx150x_i2c_write(chip->client,
-			chip->dev_cfg->reg_misc,
-			0x01);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
-			pdata->io_pullup_ena);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
-			pdata->io_pulldn_ena);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_drain,
-			pdata->io_open_drain_ena);
-	if (err < 0)
-		return err;
-
-	err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity,
-			pdata->io_polarity);
-	if (err < 0)
-		return err;
-
-	if (pdata->oscio_is_gpo)
-		sx150x_set_oscio(chip, 0);
-
-	return err;
-}
-
-static int sx150x_install_irq_chip(struct sx150x_chip *chip,
-				int irq_summary,
-				int irq_base)
-{
-	int err;
-	unsigned n;
-	unsigned irq;
-
-	chip->irq_summary = irq_summary;
-	chip->irq_base    = irq_base;
-
-	for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
-		irq = irq_base + n;
-		irq_set_chip_and_handler(irq, &chip->irq_chip, handle_edge_irq);
-		irq_set_nested_thread(irq, 1);
-#ifdef CONFIG_ARM
-		set_irq_flags(irq, IRQF_VALID);
-#else
-		irq_set_noprobe(irq);
-#endif
-	}
-
-	err = request_threaded_irq(irq_summary,
-				NULL,
-				sx150x_irq_thread_fn,
-				IRQF_SHARED | IRQF_TRIGGER_FALLING,
-				chip->irq_chip.name,
-				chip);
-	if (err < 0) {
-		chip->irq_summary = -1;
-		chip->irq_base    = -1;
-	}
-
-	return err;
-}
-
-static void sx150x_remove_irq_chip(struct sx150x_chip *chip)
-{
-	unsigned n;
-	unsigned irq;
-
-	free_irq(chip->irq_summary, chip);
-
-	for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
-		irq = chip->irq_base + n;
-		irq_set_chip_and_handler(irq, NULL, NULL);
-	}
-}
-
-static int __devinit sx150x_probe(struct i2c_client *client,
-				const struct i2c_device_id *id)
-{
-	static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
-				     I2C_FUNC_SMBUS_WRITE_WORD_DATA;
-	struct sx150x_platform_data *pdata;
-	struct sx150x_chip *chip;
-	int rc;
-
-	pdata = client->dev.platform_data;
-	if (!pdata)
-		return -EINVAL;
-
-	if (!i2c_check_functionality(client->adapter, i2c_funcs))
-		return -ENOSYS;
-
-	chip = kzalloc(sizeof(struct sx150x_chip), GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
-	sx150x_init_chip(chip, client, id->driver_data, pdata);
-	rc = sx150x_init_hw(chip, pdata);
-	if (rc < 0)
-		goto probe_fail_pre_gpiochip_add;
-
-	rc = gpiochip_add(&chip->gpio_chip);
-	if (rc < 0)
-		goto probe_fail_pre_gpiochip_add;
-
-	if (pdata->irq_summary >= 0) {
-		rc = sx150x_install_irq_chip(chip,
-					pdata->irq_summary,
-					pdata->irq_base);
-		if (rc < 0)
-			goto probe_fail_post_gpiochip_add;
-	}
-
-	i2c_set_clientdata(client, chip);
-
-	return 0;
-probe_fail_post_gpiochip_add:
-	WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
-probe_fail_pre_gpiochip_add:
-	kfree(chip);
-	return rc;
-}
-
-static int __devexit sx150x_remove(struct i2c_client *client)
-{
-	struct sx150x_chip *chip;
-	int rc;
-
-	chip = i2c_get_clientdata(client);
-	rc = gpiochip_remove(&chip->gpio_chip);
-	if (rc < 0)
-		return rc;
-
-	if (chip->irq_summary >= 0)
-		sx150x_remove_irq_chip(chip);
-
-	kfree(chip);
-
-	return 0;
-}
-
-static struct i2c_driver sx150x_driver = {
-	.driver = {
-		.name = "sx150x",
-		.owner = THIS_MODULE
-	},
-	.probe    = sx150x_probe,
-	.remove   = __devexit_p(sx150x_remove),
-	.id_table = sx150x_id,
-};
-
-static int __init sx150x_init(void)
-{
-	return i2c_add_driver(&sx150x_driver);
-}
-subsys_initcall(sx150x_init);
-
-static void __exit sx150x_exit(void)
-{
-	return i2c_del_driver(&sx150x_driver);
-}
-module_exit(sx150x_exit);
-
-MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
-MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("i2c:sx150x");