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Input: synaptics-rmi4 - add device tree support for RMI4 I2C devices

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Add devicetree binding for I2C devices and add bindings for optional
parameters in the function drivers. Parameters for function drivers are
defined in child nodes for each of the functions.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Andrew Duggan
2016-03-10 15:46:32 -08:00
committed by Dmitry Torokhov
parent fdf51604f1
commit d8a8b3edfd
8 changed files with 217 additions and 5 deletions
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35
drivers/input/rmi4/rmi_bus.c
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@@ -153,6 +153,21 @@ static int rmi_function_match(struct device *dev, struct device_driver *drv)
return fn->fd.function_number == handler->func;
}
#ifdef CONFIG_OF
static void rmi_function_of_probe(struct rmi_function *fn)
{
char of_name[9];
snprintf(of_name, sizeof(of_name), "rmi4-f%02x",
fn->fd.function_number);
fn->dev.of_node = of_find_node_by_name(
fn->rmi_dev->xport->dev->of_node, of_name);
}
#else
static inline void rmi_function_of_probe(struct rmi_function *fn)
{}
#endif
static int rmi_function_probe(struct device *dev)
{
struct rmi_function *fn = to_rmi_function(dev);
@@ -160,6 +175,8 @@ static int rmi_function_probe(struct device *dev)
to_rmi_function_handler(dev->driver);
int error;
rmi_function_of_probe(fn);
if (handler->probe) {
error = handler->probe(fn);
return error;
@@ -325,6 +342,24 @@ err_unregister_function_handlers:
return ret;
}
int rmi_of_property_read_u32(struct device *dev, u32 *result,
const char *prop, bool optional)
{
int retval;
u32 val = 0;
retval = of_property_read_u32(dev->of_node, prop, &val);
if (retval && (!optional && retval == -EINVAL)) {
dev_err(dev, "Failed to get %s value: %d\n",
prop, retval);
return retval;
}
*result = val;
return 0;
}
EXPORT_SYMBOL_GPL(rmi_of_property_read_u32);
static int __init rmi_bus_init(void)
{
int error;