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Subject[PATCH 1/2] drivers/gpio/gpio-adp5588.c: add device tree support
Make platform data optional and add DT id table.
Switch to dynamically mapped GPIOs and IRQs if not provided
via platform data.

Signed-off-by: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
---
drivers/gpio/gpio-adp5588.c | 151 ++++++++++++++++--------------------
1 file changed, 68 insertions(+), 83 deletions(-)

diff --git a/drivers/gpio/gpio-adp5588.c b/drivers/gpio/gpio-adp5588.c
index da9781a2ef4a..0a8cfccba818 100644
--- a/drivers/gpio/gpio-adp5588.c
+++ b/drivers/gpio/gpio-adp5588.c
@@ -15,6 +15,7 @@
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/of_device.h>

#include <linux/platform_data/adp5588.h>

@@ -33,8 +34,6 @@ struct adp5588_gpio {
struct mutex lock; /* protect cached dir, dat_out */
/* protect serialized access to the interrupt controller bus */
struct mutex irq_lock;
- unsigned gpio_start;
- unsigned irq_base;
uint8_t dat_out[3];
uint8_t dir[3];
uint8_t int_lvl[3];
@@ -148,16 +147,11 @@ static int adp5588_gpio_direction_output(struct gpio_chip *chip,
}

#ifdef CONFIG_GPIO_ADP5588_IRQ
-static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
-{
- struct adp5588_gpio *dev = gpiochip_get_data(chip);
-
- return dev->irq_base + off;
-}

static void adp5588_irq_bus_lock(struct irq_data *d)
{
- struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct adp5588_gpio *dev = gpiochip_get_data(gc);

mutex_lock(&dev->irq_lock);
}
@@ -172,7 +166,8 @@ static void adp5588_irq_bus_lock(struct irq_data *d)

static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
{
- struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct adp5588_gpio *dev = gpiochip_get_data(gc);
int i;

for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
@@ -203,24 +198,25 @@ static void adp5588_irq_bus_sync_unlock(struct irq_data *d)

static void adp5588_irq_mask(struct irq_data *d)
{
- struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
- unsigned gpio = d->irq - dev->irq_base;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct adp5588_gpio *dev = gpiochip_get_data(gc);

- dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
+ dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
}

static void adp5588_irq_unmask(struct irq_data *d)
{
- struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
- unsigned gpio = d->irq - dev->irq_base;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct adp5588_gpio *dev = gpiochip_get_data(gc);

- dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio);
+ dev->irq_mask[ADP5588_BANK(d->hwirq)] |= ADP5588_BIT(d->hwirq);
}

static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
{
- struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
- uint16_t gpio = d->irq - dev->irq_base;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct adp5588_gpio *dev = gpiochip_get_data(gc);
+ uint16_t gpio = d->hwirq;
unsigned bank, bit;

if ((type & IRQ_TYPE_EDGE_BOTH)) {
@@ -281,10 +277,11 @@ static irqreturn_t adp5588_irq_handler(int irq, void *devid)

while (pending) {
if (pending & (1 << bit)) {
- handle_nested_irq(dev->irq_base +
- (bank << 3) + bit);
+ handle_nested_irq(
+ irq_find_mapping(
+ dev->gpio_chip.irq.domain,
+ (bank << 3) + bit));
pending &= ~(1 << bit);
-
}
bit++;
}
@@ -299,53 +296,43 @@ static irqreturn_t adp5588_irq_handler(int irq, void *devid)
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
struct i2c_client *client = dev->client;
+ int ret;
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
- unsigned gpio;
- int ret;
+ int irq_base = pdata ? pdata->irq_base : 0;

adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */

- dev->irq_base = pdata->irq_base;
mutex_init(&dev->irq_lock);

- for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
- int irq = gpio + dev->irq_base;
- irq_set_chip_data(irq, dev);
- irq_set_chip_and_handler(irq, &adp5588_irq_chip,
- handle_level_irq);
- irq_set_nested_thread(irq, 1);
- irq_modify_status(irq, IRQ_NOREQUEST, IRQ_NOPROBE);
- }
-
- ret = request_threaded_irq(client->irq,
- NULL,
- adp5588_irq_handler,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- dev_name(&client->dev), dev);
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, adp5588_irq_handler, IRQF_ONESHOT
+ | IRQF_TRIGGER_FALLING | IRQF_SHARED,
+ dev_name(&client->dev), dev);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
client->irq);
- goto out;
+ return ret;
}
+ ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
+ &adp5588_irq_chip, irq_base,
+ handle_simple_irq,
+ IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(&client->dev,
+ "could not connect irqchip to gpiochip\n");
+ return ret;
+ }
+ gpiochip_set_nested_irqchip(&dev->gpio_chip,
+ &adp5588_irq_chip,
+ client->irq);

- dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
adp5588_gpio_write(client, CFG,
ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);

return 0;
-
-out:
- dev->irq_base = 0;
- return ret;
-}
-
-static void adp5588_irq_teardown(struct adp5588_gpio *dev)
-{
- if (dev->irq_base)
- free_irq(dev->client->irq, dev);
}

#else
@@ -357,24 +344,16 @@ static int adp5588_irq_setup(struct adp5588_gpio *dev)
return 0;
}

-static void adp5588_irq_teardown(struct adp5588_gpio *dev)
-{
-}
#endif /* CONFIG_GPIO_ADP5588_IRQ */

-static int adp5588_gpio_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int adp5588_gpio_probe(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp5588_gpio *dev;
struct gpio_chip *gc;
int ret, i, revid;
-
- if (!pdata) {
- dev_err(&client->dev, "missing platform data\n");
- return -ENODEV;
- }
+ unsigned int pullup_dis_mask = 0;

if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
@@ -394,18 +373,24 @@ static int adp5588_gpio_probe(struct i2c_client *client,
gc->get = adp5588_gpio_get_value;
gc->set = adp5588_gpio_set_value;
gc->can_sleep = true;
+ gc->base = -1;
+ gc->parent = &client->dev;
+
+ if (pdata) {
+ gc->base = pdata->gpio_start;
+ gc->names = pdata->names;
+ pullup_dis_mask = pdata->pullup_dis_mask;
+ }

- gc->base = pdata->gpio_start;
gc->ngpio = ADP5588_MAXGPIO;
gc->label = client->name;
gc->owner = THIS_MODULE;
- gc->names = pdata->names;

mutex_init(&dev->lock);

ret = adp5588_gpio_read(dev->client, DEV_ID);
if (ret < 0)
- goto err;
+ return ret;

revid = ret & ADP5588_DEVICE_ID_MASK;

@@ -414,30 +399,27 @@ static int adp5588_gpio_probe(struct i2c_client *client,
dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
- (pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
+ (pullup_dis_mask >> (8 * i)) & 0xFF);
ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
if (ret)
- goto err;
+ return ret;
}

- if (pdata->irq_base) {
+ if (client->irq) {
if (WA_DELAYED_READOUT_REVID(revid)) {
dev_warn(&client->dev, "GPIO int not supported\n");
} else {
ret = adp5588_irq_setup(dev);
if (ret)
- goto err;
+ return ret;
}
}

ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
if (ret)
- goto err_irq;
+ return ret;

- dev_info(&client->dev, "IRQ Base: %d Rev.: %d\n",
- pdata->irq_base, revid);
-
- if (pdata->setup) {
+ if (pdata && pdata->setup) {
ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
@@ -446,11 +428,6 @@ static int adp5588_gpio_probe(struct i2c_client *client,
i2c_set_clientdata(client, dev);

return 0;
-
-err_irq:
- adp5588_irq_teardown(dev);
-err:
- return ret;
}

static int adp5588_gpio_remove(struct i2c_client *client)
@@ -460,7 +437,7 @@ static int adp5588_gpio_remove(struct i2c_client *client)
struct adp5588_gpio *dev = i2c_get_clientdata(client);
int ret;

- if (pdata->teardown) {
+ if (pdata && pdata->teardown) {
ret = pdata->teardown(client,
dev->gpio_chip.base, dev->gpio_chip.ngpio,
pdata->context);
@@ -470,7 +447,7 @@ static int adp5588_gpio_remove(struct i2c_client *client)
}
}

- if (dev->irq_base)
+ if (dev->client->irq)
free_irq(dev->client->irq, dev);

return 0;
@@ -480,14 +457,22 @@ static const struct i2c_device_id adp5588_gpio_id[] = {
{DRV_NAME, 0},
{}
};
-
MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);

+#ifdef CONFIG_OF
+static const struct of_device_id adp5588_gpio_of_id[] = {
+ { .compatible = "adi," DRV_NAME, },
+ {},
+};
+MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
+#endif
+
static struct i2c_driver adp5588_gpio_driver = {
.driver = {
- .name = DRV_NAME,
- },
- .probe = adp5588_gpio_probe,
+ .name = DRV_NAME,
+ .of_match_table = of_match_ptr(adp5588_gpio_of_id),
+ },
+ .probe_new = adp5588_gpio_probe,
.remove = adp5588_gpio_remove,
.id_table = adp5588_gpio_id,
};
--
2.17.1
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