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i2c-i801: Let i2c-mux-gpio find the GPIO chip 

Now that i2c-mux-gpio is able to find the GPIO chip by itself, we can
delegate this task. The great thing here is that i2c-mux-gpio can
defer device probing until the gpio chip is available, so we no longer
depend on the module loading order.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2012-10-05 22:23:54 +02:00 committed by Jean Delvare
parent 600a711cfe
commit f82b86267a
1 changed files with 4 additions and 33 deletions
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37
drivers/i2c/busses/i2c-i801.c
View File

@ -194,7 +194,6 @@ struct i801_priv {
#if defined CONFIG_I2C_MUX || defined CONFIG_I2C_MUX_MODULE
const struct i801_mux_config *mux_drvdata;
unsigned mux_priv[2];
struct platform_device *mux_pdev;
#endif
};
@ -1008,60 +1007,32 @@ static struct dmi_system_id __devinitdata mux_dmi_table[] = {
{ }
};
static int __devinit match_gpio_chip_by_label(struct gpio_chip *chip,
void *data)
{
return !strcmp(chip->label, data);
}
/* Setup multiplexing if needed */
static int __devinit i801_add_mux(struct i801_priv *priv)
{
struct device *dev = &priv->adapter.dev;
const struct i801_mux_config *mux_config;
struct gpio_chip *gpio;
struct i2c_mux_gpio_platform_data gpio_data;
int i, err;
int err;
if (!priv->mux_drvdata)
return 0;
mux_config = priv->mux_drvdata;
/* Find GPIO chip */
gpio = gpiochip_find(mux_config->gpio_chip, match_gpio_chip_by_label);
if (gpio) {
dev_info(dev,
"GPIO chip %s found, SMBus multiplexing enabled\n",
mux_config->gpio_chip);
} else {
dev_err(dev,
"GPIO chip %s not found, SMBus multiplexing disabled\n",
mux_config->gpio_chip);
return -ENODEV;
}
/* Find absolute GPIO pin numbers */
if (ARRAY_SIZE(priv->mux_priv) < mux_config->n_gpios) {
dev_err(dev, "i801_priv.mux_priv too small (%zu, need %d)\n",
ARRAY_SIZE(priv->mux_priv), mux_config->n_gpios);
return -ENODEV;
}
for (i = 0; i < mux_config->n_gpios; i++)
priv->mux_priv[i] = gpio->base + mux_config->gpios[i];
/* Prepare the platform data */
memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
gpio_data.parent = priv->adapter.nr;
gpio_data.values = mux_config->values;
gpio_data.n_values = mux_config->n_values;
gpio_data.classes = mux_config->classes;
gpio_data.gpios = priv->mux_priv;
gpio_data.gpio_chip = mux_config->gpio_chip;
gpio_data.gpios = mux_config->gpios;
gpio_data.n_gpios = mux_config->n_gpios;
gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
/* Register the mux device */
priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
priv->mux_priv[0], &gpio_data,
PLATFORM_DEVID_AUTO, &gpio_data,
sizeof(struct i2c_mux_gpio_platform_data));
if (IS_ERR(priv->mux_pdev)) {
err = PTR_ERR(priv->mux_pdev);