static int __devinit pca953x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca953x_platform_data *pdata;
struct pca953x_chip *chip;
int ret;
pdata = client->dev.platform_data;
if (pdata == NULL) {
dev_dbg(&client->dev, "no platform data\n");
return -EINVAL;
}
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->client = client;
chip->gpio_start = pdata->gpio_base;
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
pca953x_setup_gpio(chip, id->driver_data);
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
if (ret)
goto out_failed;
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
if (ret)
goto out_failed;
/* set platform specific polarity inversion */
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
if (ret)
goto out_failed;
ret = gpiochip_add(&chip->gpio_chip);
if (ret)
goto out_failed;
if (pdata->setup) {
ret = pdata->setup(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, chip);
return 0;
out_failed:
kfree(chip);
return ret;
}
static int pca953x_suspend(struct i2c_client *client, pm_message_t state)
{
struct pca953x_platform_data *pdata = client->dev.platform_data;
struct pca953x_chip *chip = i2c_get_clientdata(client);
int ret;
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
if (ret)
return ret;
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
return ret;
}
static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
{
uint16_t cur_stat;
uint16_t old_stat;
uint16_t pending;
uint16_t trigger;
int ret;
ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat);
if (ret)
return 0;
/* Remove output pins from the equation */
cur_stat &= chip->reg_direction;
old_stat = chip->irq_stat;
trigger = (cur_stat ^ old_stat) & chip->irq_mask;
if (!trigger)
return 0;
chip->irq_stat = cur_stat;
pending = (old_stat & chip->irq_trig_fall) |
(cur_stat & chip->irq_trig_raise);
pending &= trigger;
return pending;
}
static int pca953x_irq_setup(struct pca953x_chip *chip,
const struct i2c_device_id *id)
{
struct i2c_client *client = chip->client;
struct pca953x_platform_data *pdata = client->dev.platform_data;
int ret;
if (pdata->irq_base != -1
&& (id->driver_data & PCA953X_INT)) {
int lvl;
ret = pca953x_read_reg(chip, PCA953X_INPUT,
&chip->irq_stat);
if (ret)
goto out_failed;
/*
* There is no way to know which GPIO line generated the
* interrupt. We have to rely on the previous read for
* this purpose.
*/
chip->irq_stat &= chip->reg_direction;
chip->irq_base = pdata->irq_base;
mutex_init(&chip->irq_lock);
for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
int irq = lvl + chip->irq_base;
irq_set_chip_data(irq, chip);
irq_set_chip_and_handler(irq, &pca953x_irq_chip,
handle_edge_irq);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
}
ret = request_threaded_irq(client->irq,
NULL,
pca953x_irq_handler,
IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
dev_name(&client->dev), chip);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
client->irq);
goto out_failed;
}
chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
}
return 0;
out_failed:
chip->irq_base = -1;
return ret;
}
static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip;
uint16_t reg_val;
int ret;
chip = container_of(gc, struct pca953x_chip, gpio_chip);
ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
if (ret < 0) {
/* NOTE: diagnostic already emitted; that's all we should
* do unless gpio_*_value_cansleep() calls become different
* from their nonsleeping siblings (and report faults).
*/
return 0;
}
return (reg_val & (1u << off)) ? 1 : 0;
}
static int pca953x_resume(struct i2c_client *client)
{
struct pca953x_platform_data *pdata = client->dev.platform_data;
struct pca953x_chip *chip = i2c_get_clientdata(client);
uint16_t reg_val;
int ret = 0;
/* set platform specific polarity inversion */
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
if (ret)
return ret;
ret = pca953x_write_reg(chip, PCA953X_OUTPUT, chip->reg_output);
if (ret)
return ret;
ret = pca953x_write_reg(chip, PCA953X_DIRECTION, chip->reg_direction);
if (ret)
return ret;
ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
return ret;
}
static int __devinit pca953x_probe(struct i2c_client *client)
{
struct pca953x_platform_data *pdata;
struct pca953x_chip *chip;
int ret, i;
const struct pca953x_desc *id = NULL;
pdata = client->dev.platform_data;
if (pdata == NULL)
return -ENODEV;
/* this loop vanishes when we get i2c_device_id */
for (i = 0; i < ARRAY_SIZE(pca953x_descs); i++)
if (!strcmp(pca953x_descs[i].name, client->name)) {
id = pca953x_descs + i;
break;
}
if (!id)
return -ENODEV;
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->client = client;
chip->gpio_start = pdata->gpio_base;
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
pca953x_setup_gpio(chip, id->driver_data);
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
if (ret)
goto out_failed;
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
if (ret)
goto out_failed;
/* set platform specific polarity inversion */
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
if (ret)
goto out_failed;
ret = gpiochip_add(&chip->gpio_chip);
if (ret)
goto out_failed;
if (pdata->setup) {
ret = pdata->setup(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, chip);
return 0;
out_failed:
kfree(chip);
return ret;
}
static int __devinit pca953x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca953x_platform_data *pdata;
struct pca953x_chip *chip;
int ret;
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
pdata = client->dev.platform_data;
if (pdata == NULL) {
pdata = pca953x_get_alt_pdata(client);
/*
* Unlike normal platform_data, this is allocated
* dynamically and must be freed in the driver
*/
chip->dyn_pdata = pdata;
}
if (pdata == NULL) {
dev_dbg(&client->dev, "no platform data\n");
ret = -EINVAL;
goto out_failed;
}
chip->client = client;
chip->gpio_start = pdata->gpio_base;
chip->names = pdata->names;
mutex_init(&chip->i2c_lock);
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS);
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
if (ret)
goto out_failed;
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
if (ret)
goto out_failed;
/* set platform specific polarity inversion */
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
if (ret)
goto out_failed;
ret = pca953x_irq_setup(chip, id);
if (ret)
goto out_failed;
ret = gpiochip_add(&chip->gpio_chip);
if (ret)
goto out_failed_irq;
if (pdata->setup) {
ret = pdata->setup(client, chip->gpio_chip.base,
chip->gpio_chip.ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, chip);
return 0;
out_failed_irq:
pca953x_irq_teardown(chip);
out_failed:
kfree(chip->dyn_pdata);
kfree(chip);
return ret;
}
