linux/drivers/gpio/gpio-adnp.c
Linus Walleij 57ef04288a gpio: switch drivers to use new callback
This switches all GPIO and pin control drivers with irqchips
that were using .startup() and .shutdown() callbacks to lock
GPIO lines for IRQ usage over to using the .request_resources()
and .release_resources() callbacks just introduced into the
irqchip vtable.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-03-18 09:28:30 +01:00

630 lines
14 KiB
C

/*
* Copyright (C) 2011-2012 Avionic Design GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#define GPIO_DDR(gpio) (0x00 << (gpio)->reg_shift)
#define GPIO_PLR(gpio) (0x01 << (gpio)->reg_shift)
#define GPIO_IER(gpio) (0x02 << (gpio)->reg_shift)
#define GPIO_ISR(gpio) (0x03 << (gpio)->reg_shift)
#define GPIO_PTR(gpio) (0x04 << (gpio)->reg_shift)
struct adnp {
struct i2c_client *client;
struct gpio_chip gpio;
unsigned int reg_shift;
struct mutex i2c_lock;
struct irq_domain *domain;
struct mutex irq_lock;
u8 *irq_enable;
u8 *irq_level;
u8 *irq_rise;
u8 *irq_fall;
u8 *irq_high;
u8 *irq_low;
};
static inline struct adnp *to_adnp(struct gpio_chip *chip)
{
return container_of(chip, struct adnp, gpio);
}
static int adnp_read(struct adnp *adnp, unsigned offset, uint8_t *value)
{
int err;
err = i2c_smbus_read_byte_data(adnp->client, offset);
if (err < 0) {
dev_err(adnp->gpio.dev, "%s failed: %d\n",
"i2c_smbus_read_byte_data()", err);
return err;
}
*value = err;
return 0;
}
static int adnp_write(struct adnp *adnp, unsigned offset, uint8_t value)
{
int err;
err = i2c_smbus_write_byte_data(adnp->client, offset, value);
if (err < 0) {
dev_err(adnp->gpio.dev, "%s failed: %d\n",
"i2c_smbus_write_byte_data()", err);
return err;
}
return 0;
}
static int adnp_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct adnp *adnp = to_adnp(chip);
unsigned int reg = offset >> adnp->reg_shift;
unsigned int pos = offset & 7;
u8 value;
int err;
err = adnp_read(adnp, GPIO_PLR(adnp) + reg, &value);
if (err < 0)
return err;
return (value & BIT(pos)) ? 1 : 0;
}
static void __adnp_gpio_set(struct adnp *adnp, unsigned offset, int value)
{
unsigned int reg = offset >> adnp->reg_shift;
unsigned int pos = offset & 7;
int err;
u8 val;
err = adnp_read(adnp, GPIO_PLR(adnp) + reg, &val);
if (err < 0)
return;
if (value)
val |= BIT(pos);
else
val &= ~BIT(pos);
adnp_write(adnp, GPIO_PLR(adnp) + reg, val);
}
static void adnp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct adnp *adnp = to_adnp(chip);
mutex_lock(&adnp->i2c_lock);
__adnp_gpio_set(adnp, offset, value);
mutex_unlock(&adnp->i2c_lock);
}
static int adnp_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
struct adnp *adnp = to_adnp(chip);
unsigned int reg = offset >> adnp->reg_shift;
unsigned int pos = offset & 7;
u8 value;
int err;
mutex_lock(&adnp->i2c_lock);
err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &value);
if (err < 0)
goto out;
value &= ~BIT(pos);
err = adnp_write(adnp, GPIO_DDR(adnp) + reg, value);
if (err < 0)
goto out;
err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &value);
if (err < 0)
goto out;
if (err & BIT(pos))
err = -EACCES;
err = 0;
out:
mutex_unlock(&adnp->i2c_lock);
return err;
}
static int adnp_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct adnp *adnp = to_adnp(chip);
unsigned int reg = offset >> adnp->reg_shift;
unsigned int pos = offset & 7;
int err;
u8 val;
mutex_lock(&adnp->i2c_lock);
err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &val);
if (err < 0)
goto out;
val |= BIT(pos);
err = adnp_write(adnp, GPIO_DDR(adnp) + reg, val);
if (err < 0)
goto out;
err = adnp_read(adnp, GPIO_DDR(adnp) + reg, &val);
if (err < 0)
goto out;
if (!(val & BIT(pos))) {
err = -EPERM;
goto out;
}
__adnp_gpio_set(adnp, offset, value);
err = 0;
out:
mutex_unlock(&adnp->i2c_lock);
return err;
}
static void adnp_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
struct adnp *adnp = to_adnp(chip);
unsigned int num_regs = 1 << adnp->reg_shift, i, j;
int err;
for (i = 0; i < num_regs; i++) {
u8 ddr, plr, ier, isr;
mutex_lock(&adnp->i2c_lock);
err = adnp_read(adnp, GPIO_DDR(adnp) + i, &ddr);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
return;
}
err = adnp_read(adnp, GPIO_PLR(adnp) + i, &plr);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
return;
}
err = adnp_read(adnp, GPIO_IER(adnp) + i, &ier);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
return;
}
err = adnp_read(adnp, GPIO_ISR(adnp) + i, &isr);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
return;
}
mutex_unlock(&adnp->i2c_lock);
for (j = 0; j < 8; j++) {
unsigned int bit = (i << adnp->reg_shift) + j;
const char *direction = "input ";
const char *level = "low ";
const char *interrupt = "disabled";
const char *pending = "";
if (ddr & BIT(j))
direction = "output";
if (plr & BIT(j))
level = "high";
if (ier & BIT(j))
interrupt = "enabled ";
if (isr & BIT(j))
pending = "pending";
seq_printf(s, "%2u: %s %s IRQ %s %s\n", bit,
direction, level, interrupt, pending);
}
}
}
static int adnp_gpio_setup(struct adnp *adnp, unsigned int num_gpios)
{
struct gpio_chip *chip = &adnp->gpio;
adnp->reg_shift = get_count_order(num_gpios) - 3;
chip->direction_input = adnp_gpio_direction_input;
chip->direction_output = adnp_gpio_direction_output;
chip->get = adnp_gpio_get;
chip->set = adnp_gpio_set;
chip->can_sleep = true;
if (IS_ENABLED(CONFIG_DEBUG_FS))
chip->dbg_show = adnp_gpio_dbg_show;
chip->base = -1;
chip->ngpio = num_gpios;
chip->label = adnp->client->name;
chip->dev = &adnp->client->dev;
chip->of_node = chip->dev->of_node;
chip->owner = THIS_MODULE;
return 0;
}
static irqreturn_t adnp_irq(int irq, void *data)
{
struct adnp *adnp = data;
unsigned int num_regs, i;
num_regs = 1 << adnp->reg_shift;
for (i = 0; i < num_regs; i++) {
unsigned int base = i << adnp->reg_shift, bit;
u8 changed, level, isr, ier;
unsigned long pending;
int err;
mutex_lock(&adnp->i2c_lock);
err = adnp_read(adnp, GPIO_PLR(adnp) + i, &level);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
continue;
}
err = adnp_read(adnp, GPIO_ISR(adnp) + i, &isr);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
continue;
}
err = adnp_read(adnp, GPIO_IER(adnp) + i, &ier);
if (err < 0) {
mutex_unlock(&adnp->i2c_lock);
continue;
}
mutex_unlock(&adnp->i2c_lock);
/* determine pins that changed levels */
changed = level ^ adnp->irq_level[i];
/* compute edge-triggered interrupts */
pending = changed & ((adnp->irq_fall[i] & ~level) |
(adnp->irq_rise[i] & level));
/* add in level-triggered interrupts */
pending |= (adnp->irq_high[i] & level) |
(adnp->irq_low[i] & ~level);
/* mask out non-pending and disabled interrupts */
pending &= isr & ier;
for_each_set_bit(bit, &pending, 8) {
unsigned int child_irq;
child_irq = irq_find_mapping(adnp->domain, base + bit);
handle_nested_irq(child_irq);
}
}
return IRQ_HANDLED;
}
static int adnp_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct adnp *adnp = to_adnp(chip);
return irq_create_mapping(adnp->domain, offset);
}
static void adnp_irq_mask(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
unsigned int reg = data->hwirq >> adnp->reg_shift;
unsigned int pos = data->hwirq & 7;
adnp->irq_enable[reg] &= ~BIT(pos);
}
static void adnp_irq_unmask(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
unsigned int reg = data->hwirq >> adnp->reg_shift;
unsigned int pos = data->hwirq & 7;
adnp->irq_enable[reg] |= BIT(pos);
}
static int adnp_irq_set_type(struct irq_data *data, unsigned int type)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
unsigned int reg = data->hwirq >> adnp->reg_shift;
unsigned int pos = data->hwirq & 7;
if (type & IRQ_TYPE_EDGE_RISING)
adnp->irq_rise[reg] |= BIT(pos);
else
adnp->irq_rise[reg] &= ~BIT(pos);
if (type & IRQ_TYPE_EDGE_FALLING)
adnp->irq_fall[reg] |= BIT(pos);
else
adnp->irq_fall[reg] &= ~BIT(pos);
if (type & IRQ_TYPE_LEVEL_HIGH)
adnp->irq_high[reg] |= BIT(pos);
else
adnp->irq_high[reg] &= ~BIT(pos);
if (type & IRQ_TYPE_LEVEL_LOW)
adnp->irq_low[reg] |= BIT(pos);
else
adnp->irq_low[reg] &= ~BIT(pos);
return 0;
}
static void adnp_irq_bus_lock(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
mutex_lock(&adnp->irq_lock);
}
static void adnp_irq_bus_unlock(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
unsigned int num_regs = 1 << adnp->reg_shift, i;
mutex_lock(&adnp->i2c_lock);
for (i = 0; i < num_regs; i++)
adnp_write(adnp, GPIO_IER(adnp) + i, adnp->irq_enable[i]);
mutex_unlock(&adnp->i2c_lock);
mutex_unlock(&adnp->irq_lock);
}
static int adnp_irq_reqres(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
if (gpio_lock_as_irq(&adnp->gpio, data->hwirq)) {
dev_err(adnp->gpio.dev,
"unable to lock HW IRQ %lu for IRQ\n",
data->hwirq);
return -EINVAL;
}
return 0;
}
static void adnp_irq_relres(struct irq_data *data)
{
struct adnp *adnp = irq_data_get_irq_chip_data(data);
gpio_unlock_as_irq(&adnp->gpio, data->hwirq);
}
static struct irq_chip adnp_irq_chip = {
.name = "gpio-adnp",
.irq_mask = adnp_irq_mask,
.irq_unmask = adnp_irq_unmask,
.irq_set_type = adnp_irq_set_type,
.irq_bus_lock = adnp_irq_bus_lock,
.irq_bus_sync_unlock = adnp_irq_bus_unlock,
.irq_request_resources = adnp_irq_reqres,
.irq_release_resources = adnp_irq_relres,
};
static int adnp_irq_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_data(irq, domain->host_data);
irq_set_chip(irq, &adnp_irq_chip);
irq_set_nested_thread(irq, true);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
return 0;
}
static const struct irq_domain_ops adnp_irq_domain_ops = {
.map = adnp_irq_map,
.xlate = irq_domain_xlate_twocell,
};
static int adnp_irq_setup(struct adnp *adnp)
{
unsigned int num_regs = 1 << adnp->reg_shift, i;
struct gpio_chip *chip = &adnp->gpio;
int err;
mutex_init(&adnp->irq_lock);
/*
* Allocate memory to keep track of the current level and trigger
* modes of the interrupts. To avoid multiple allocations, a single
* large buffer is allocated and pointers are setup to point at the
* corresponding offsets. For consistency, the layout of the buffer
* is chosen to match the register layout of the hardware in that
* each segment contains the corresponding bits for all interrupts.
*/
adnp->irq_enable = devm_kzalloc(chip->dev, num_regs * 6, GFP_KERNEL);
if (!adnp->irq_enable)
return -ENOMEM;
adnp->irq_level = adnp->irq_enable + (num_regs * 1);
adnp->irq_rise = adnp->irq_enable + (num_regs * 2);
adnp->irq_fall = adnp->irq_enable + (num_regs * 3);
adnp->irq_high = adnp->irq_enable + (num_regs * 4);
adnp->irq_low = adnp->irq_enable + (num_regs * 5);
for (i = 0; i < num_regs; i++) {
/*
* Read the initial level of all pins to allow the emulation
* of edge triggered interrupts.
*/
err = adnp_read(adnp, GPIO_PLR(adnp) + i, &adnp->irq_level[i]);
if (err < 0)
return err;
/* disable all interrupts */
err = adnp_write(adnp, GPIO_IER(adnp) + i, 0);
if (err < 0)
return err;
adnp->irq_enable[i] = 0x00;
}
adnp->domain = irq_domain_add_linear(chip->of_node, chip->ngpio,
&adnp_irq_domain_ops, adnp);
err = request_threaded_irq(adnp->client->irq, NULL, adnp_irq,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
dev_name(chip->dev), adnp);
if (err != 0) {
dev_err(chip->dev, "can't request IRQ#%d: %d\n",
adnp->client->irq, err);
return err;
}
chip->to_irq = adnp_gpio_to_irq;
return 0;
}
static void adnp_irq_teardown(struct adnp *adnp)
{
unsigned int irq, i;
free_irq(adnp->client->irq, adnp);
for (i = 0; i < adnp->gpio.ngpio; i++) {
irq = irq_find_mapping(adnp->domain, i);
if (irq > 0)
irq_dispose_mapping(irq);
}
irq_domain_remove(adnp->domain);
}
static int adnp_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device_node *np = client->dev.of_node;
struct adnp *adnp;
u32 num_gpios;
int err;
err = of_property_read_u32(np, "nr-gpios", &num_gpios);
if (err < 0)
return err;
client->irq = irq_of_parse_and_map(np, 0);
if (!client->irq)
return -EPROBE_DEFER;
adnp = devm_kzalloc(&client->dev, sizeof(*adnp), GFP_KERNEL);
if (!adnp)
return -ENOMEM;
mutex_init(&adnp->i2c_lock);
adnp->client = client;
err = adnp_gpio_setup(adnp, num_gpios);
if (err < 0)
return err;
if (of_find_property(np, "interrupt-controller", NULL)) {
err = adnp_irq_setup(adnp);
if (err < 0)
goto teardown;
}
err = gpiochip_add(&adnp->gpio);
if (err < 0)
goto teardown;
i2c_set_clientdata(client, adnp);
return 0;
teardown:
if (of_find_property(np, "interrupt-controller", NULL))
adnp_irq_teardown(adnp);
return err;
}
static int adnp_i2c_remove(struct i2c_client *client)
{
struct adnp *adnp = i2c_get_clientdata(client);
struct device_node *np = client->dev.of_node;
int err;
err = gpiochip_remove(&adnp->gpio);
if (err < 0) {
dev_err(&client->dev, "%s failed: %d\n", "gpiochip_remove()",
err);
return err;
}
if (of_find_property(np, "interrupt-controller", NULL))
adnp_irq_teardown(adnp);
return 0;
}
static const struct i2c_device_id adnp_i2c_id[] = {
{ "gpio-adnp" },
{ },
};
MODULE_DEVICE_TABLE(i2c, adnp_i2c_id);
static const struct of_device_id adnp_of_match[] = {
{ .compatible = "ad,gpio-adnp", },
{ },
};
MODULE_DEVICE_TABLE(of, adnp_of_match);
static struct i2c_driver adnp_i2c_driver = {
.driver = {
.name = "gpio-adnp",
.owner = THIS_MODULE,
.of_match_table = adnp_of_match,
},
.probe = adnp_i2c_probe,
.remove = adnp_i2c_remove,
.id_table = adnp_i2c_id,
};
module_i2c_driver(adnp_i2c_driver);
MODULE_DESCRIPTION("Avionic Design N-bit GPIO expander");
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_LICENSE("GPL");