static int __devinit gpiomux_probe(struct platform_device *pdev)
{
struct gpiomux *mux;
struct gpio_i2cmux_platform_data *pdata;
struct i2c_adapter *parent;
int (*deselect) (struct i2c_adapter *, void *, u32);
unsigned initial_state;
int i, ret;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "Missing platform data\n");
return -ENODEV;
}
parent = i2c_get_adapter(pdata->parent);
if (!parent) {
dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
pdata->parent);
return -ENODEV;
}
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux) {
ret = -ENOMEM;
goto alloc_failed;
}
mux->parent = parent;
mux->data = *pdata;
mux->adap = kzalloc(sizeof(struct i2c_adapter *) * pdata->n_values,
GFP_KERNEL);
if (!mux->adap) {
ret = -ENOMEM;
goto alloc_failed2;
}
if (pdata->idle != GPIO_I2CMUX_NO_IDLE) {
initial_state = pdata->idle;
deselect = gpiomux_deselect;
} else {
initial_state = pdata->values[0];
deselect = NULL;
}
for (i = 0; i < pdata->n_gpios; i++) {
ret = gpio_request(pdata->gpios[i], "gpio-i2cmux");
if (ret)
goto err_request_gpio;
gpio_direction_output(pdata->gpios[i],
initial_state & (1 << i));
}
for (i = 0; i < pdata->n_values; i++) {
u32 nr = pdata->base_nr ? (pdata->base_nr + i) : 0;
mux->adap[i] = i2c_add_mux_adapter(parent, mux, nr, i,
gpiomux_select, deselect);
if (!mux->adap[i]) {
ret = -ENODEV;
dev_err(&pdev->dev, "Failed to add adapter %d\n", i);
goto add_adapter_failed;
}
}
dev_info(&pdev->dev, "%d port mux on %s adapter\n",
pdata->n_values, parent->name);
platform_set_drvdata(pdev, mux);
return 0;
add_adapter_failed:
for (; i > 0; i--)
i2c_del_mux_adapter(mux->adap[i - 1]);
i = pdata->n_gpios;
err_request_gpio:
for (; i > 0; i--)
gpio_free(pdata->gpios[i - 1]);
kfree(mux->adap);
alloc_failed2:
kfree(mux);
alloc_failed:
i2c_put_adapter(parent);
return ret;
}
static int i2c_arbitrator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *parent_np;
struct i2c_arbitrator_data *arb;
enum of_gpio_flags gpio_flags;
unsigned long out_init;
int ret;
/* We only support probing from device tree; no platform_data */
if (!np) {
dev_err(dev, "Cannot find device tree node\n");
return -ENODEV;
}
if (dev->platform_data) {
dev_err(dev, "Platform data is not supported\n");
return -EINVAL;
}
arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL);
if (!arb) {
dev_err(dev, "Cannot allocate i2c_arbitrator_data\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, arb);
/* Request GPIOs */
ret = of_get_named_gpio_flags(np, "our-claim-gpio", 0, &gpio_flags);
if (!gpio_is_valid(ret)) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error getting our-claim-gpio\n");
return ret;
}
arb->our_gpio = ret;
arb->our_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
out_init = (gpio_flags & OF_GPIO_ACTIVE_LOW) ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
ret = devm_gpio_request_one(dev, arb->our_gpio, out_init,
"our-claim-gpio");
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error requesting our-claim-gpio\n");
return ret;
}
ret = of_get_named_gpio_flags(np, "their-claim-gpios", 0, &gpio_flags);
if (!gpio_is_valid(ret)) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error getting their-claim-gpio\n");
return ret;
}
arb->their_gpio = ret;
arb->their_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
ret = devm_gpio_request_one(dev, arb->their_gpio, GPIOF_IN,
"their-claim-gpio");
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error requesting their-claim-gpio\n");
return ret;
}
/* At the moment we only support a single two master (us + 1 other) */
if (gpio_is_valid(of_get_named_gpio(np, "their-claim-gpios", 1))) {
dev_err(dev, "Only one other master is supported\n");
return -EINVAL;
}
/* Arbitration parameters */
if (of_property_read_u32(np, "slew-delay-us", &arb->slew_delay_us))
arb->slew_delay_us = 10;
if (of_property_read_u32(np, "wait-retry-us", &arb->wait_retry_us))
arb->wait_retry_us = 3000;
if (of_property_read_u32(np, "wait-free-us", &arb->wait_free_us))
arb->wait_free_us = 50000;
/* Find our parent */
parent_np = of_parse_phandle(np, "i2c-parent", 0);
if (!parent_np) {
dev_err(dev, "Cannot parse i2c-parent\n");
return -EINVAL;
}
arb->parent = of_find_i2c_adapter_by_node(parent_np);
if (!arb->parent) {
dev_err(dev, "Cannot find parent bus\n");
return -EINVAL;
}
/* Actually add the mux adapter */
arb->child = i2c_add_mux_adapter(arb->parent, dev, arb, 0, 0, 0,
i2c_arbitrator_select,
i2c_arbitrator_deselect);
if (!arb->child) {
dev_err(dev, "Failed to add adapter\n");
ret = -ENODEV;
i2c_put_adapter(arb->parent);
}
return ret;
}
