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d6e680837e
No functional modification involved. drivers/input/rmi4/rmi_bus.c:300: warning: expecting prototype for rmi_register_function_handler(). Prototype was for __rmi_register_function_handler() instead. Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Link: https://lore.kernel.org/r/20230209040710.111456-1-jiapeng.chong@linux.alibaba.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
479 lines
11 KiB
C
479 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2011-2016 Synaptics Incorporated
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* Copyright (c) 2011 Unixphere
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/list.h>
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#include <linux/pm.h>
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#include <linux/rmi.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/of.h>
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#include "rmi_bus.h"
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#include "rmi_driver.h"
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static int debug_flags;
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module_param(debug_flags, int, 0644);
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MODULE_PARM_DESC(debug_flags, "control debugging information");
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void rmi_dbg(int flags, struct device *dev, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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if (flags & debug_flags) {
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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dev_printk(KERN_DEBUG, dev, "%pV", &vaf);
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va_end(args);
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}
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}
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EXPORT_SYMBOL_GPL(rmi_dbg);
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/*
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* RMI Physical devices
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*
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* Physical RMI device consists of several functions serving particular
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* purpose. For example F11 is a 2D touch sensor while F01 is a generic
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* function present in every RMI device.
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*/
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static void rmi_release_device(struct device *dev)
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{
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struct rmi_device *rmi_dev = to_rmi_device(dev);
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kfree(rmi_dev);
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}
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static const struct device_type rmi_device_type = {
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.name = "rmi4_sensor",
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.release = rmi_release_device,
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};
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bool rmi_is_physical_device(struct device *dev)
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{
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return dev->type == &rmi_device_type;
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}
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/**
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* rmi_register_transport_device - register a transport device connection
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* on the RMI bus. Transport drivers provide communication from the devices
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* on a bus (such as SPI, I2C, and so on) to the RMI4 sensor.
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*
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* @xport: the transport device to register
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*/
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int rmi_register_transport_device(struct rmi_transport_dev *xport)
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{
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static atomic_t transport_device_count = ATOMIC_INIT(0);
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struct rmi_device *rmi_dev;
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int error;
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rmi_dev = kzalloc(sizeof(struct rmi_device), GFP_KERNEL);
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if (!rmi_dev)
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return -ENOMEM;
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device_initialize(&rmi_dev->dev);
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rmi_dev->xport = xport;
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rmi_dev->number = atomic_inc_return(&transport_device_count) - 1;
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dev_set_name(&rmi_dev->dev, "rmi4-%02d", rmi_dev->number);
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rmi_dev->dev.bus = &rmi_bus_type;
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rmi_dev->dev.type = &rmi_device_type;
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rmi_dev->dev.parent = xport->dev;
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xport->rmi_dev = rmi_dev;
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error = device_add(&rmi_dev->dev);
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if (error)
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goto err_put_device;
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rmi_dbg(RMI_DEBUG_CORE, xport->dev,
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"%s: Registered %s as %s.\n", __func__,
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dev_name(rmi_dev->xport->dev), dev_name(&rmi_dev->dev));
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return 0;
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err_put_device:
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put_device(&rmi_dev->dev);
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return error;
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}
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EXPORT_SYMBOL_GPL(rmi_register_transport_device);
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/**
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* rmi_unregister_transport_device - unregister a transport device connection
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* @xport: the transport driver to unregister
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*
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*/
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void rmi_unregister_transport_device(struct rmi_transport_dev *xport)
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{
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struct rmi_device *rmi_dev = xport->rmi_dev;
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device_del(&rmi_dev->dev);
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put_device(&rmi_dev->dev);
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}
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EXPORT_SYMBOL(rmi_unregister_transport_device);
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/* Function specific stuff */
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static void rmi_release_function(struct device *dev)
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{
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struct rmi_function *fn = to_rmi_function(dev);
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kfree(fn);
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}
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static const struct device_type rmi_function_type = {
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.name = "rmi4_function",
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.release = rmi_release_function,
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};
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bool rmi_is_function_device(struct device *dev)
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{
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return dev->type == &rmi_function_type;
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}
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static int rmi_function_match(struct device *dev, struct device_driver *drv)
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{
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struct rmi_function_handler *handler = to_rmi_function_handler(drv);
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struct rmi_function *fn = to_rmi_function(dev);
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return fn->fd.function_number == handler->func;
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}
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#ifdef CONFIG_OF
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static void rmi_function_of_probe(struct rmi_function *fn)
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{
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char of_name[9];
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struct device_node *node = fn->rmi_dev->xport->dev->of_node;
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snprintf(of_name, sizeof(of_name), "rmi4-f%02x",
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fn->fd.function_number);
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fn->dev.of_node = of_get_child_by_name(node, of_name);
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}
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#else
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static inline void rmi_function_of_probe(struct rmi_function *fn)
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{}
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#endif
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static struct irq_chip rmi_irq_chip = {
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.name = "rmi4",
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};
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static int rmi_create_function_irq(struct rmi_function *fn,
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struct rmi_function_handler *handler)
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{
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struct rmi_driver_data *drvdata = dev_get_drvdata(&fn->rmi_dev->dev);
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int i, error;
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for (i = 0; i < fn->num_of_irqs; i++) {
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set_bit(fn->irq_pos + i, fn->irq_mask);
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fn->irq[i] = irq_create_mapping(drvdata->irqdomain,
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fn->irq_pos + i);
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irq_set_chip_data(fn->irq[i], fn);
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irq_set_chip_and_handler(fn->irq[i], &rmi_irq_chip,
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handle_simple_irq);
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irq_set_nested_thread(fn->irq[i], 1);
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error = devm_request_threaded_irq(&fn->dev, fn->irq[i], NULL,
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handler->attention, IRQF_ONESHOT,
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dev_name(&fn->dev), fn);
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if (error) {
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dev_err(&fn->dev, "Error %d registering IRQ\n", error);
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return error;
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}
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}
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return 0;
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}
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static int rmi_function_probe(struct device *dev)
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{
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struct rmi_function *fn = to_rmi_function(dev);
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struct rmi_function_handler *handler =
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to_rmi_function_handler(dev->driver);
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int error;
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rmi_function_of_probe(fn);
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if (handler->probe) {
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error = handler->probe(fn);
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if (error)
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return error;
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}
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if (fn->num_of_irqs && handler->attention) {
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error = rmi_create_function_irq(fn, handler);
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if (error)
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return error;
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}
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return 0;
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}
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static int rmi_function_remove(struct device *dev)
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{
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struct rmi_function *fn = to_rmi_function(dev);
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struct rmi_function_handler *handler =
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to_rmi_function_handler(dev->driver);
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if (handler->remove)
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handler->remove(fn);
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return 0;
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}
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int rmi_register_function(struct rmi_function *fn)
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{
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struct rmi_device *rmi_dev = fn->rmi_dev;
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int error;
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device_initialize(&fn->dev);
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dev_set_name(&fn->dev, "%s.fn%02x",
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dev_name(&rmi_dev->dev), fn->fd.function_number);
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fn->dev.parent = &rmi_dev->dev;
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fn->dev.type = &rmi_function_type;
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fn->dev.bus = &rmi_bus_type;
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error = device_add(&fn->dev);
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if (error) {
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dev_err(&rmi_dev->dev,
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"Failed device_register function device %s\n",
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dev_name(&fn->dev));
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goto err_put_device;
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}
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rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Registered F%02X.\n",
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fn->fd.function_number);
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return 0;
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err_put_device:
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put_device(&fn->dev);
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return error;
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}
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void rmi_unregister_function(struct rmi_function *fn)
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{
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int i;
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rmi_dbg(RMI_DEBUG_CORE, &fn->dev, "Unregistering F%02X.\n",
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fn->fd.function_number);
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device_del(&fn->dev);
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of_node_put(fn->dev.of_node);
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put_device(&fn->dev);
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for (i = 0; i < fn->num_of_irqs; i++)
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irq_dispose_mapping(fn->irq[i]);
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}
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/**
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* __rmi_register_function_handler - register a handler for an RMI function
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* @handler: RMI handler that should be registered.
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* @owner: pointer to module that implements the handler
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* @mod_name: name of the module implementing the handler
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*
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* This function performs additional setup of RMI function handler and
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* registers it with the RMI core so that it can be bound to
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* RMI function devices.
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*/
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int __rmi_register_function_handler(struct rmi_function_handler *handler,
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struct module *owner,
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const char *mod_name)
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{
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struct device_driver *driver = &handler->driver;
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int error;
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driver->bus = &rmi_bus_type;
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driver->owner = owner;
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driver->mod_name = mod_name;
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driver->probe = rmi_function_probe;
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driver->remove = rmi_function_remove;
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error = driver_register(driver);
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if (error) {
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pr_err("driver_register() failed for %s, error: %d\n",
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driver->name, error);
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return error;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(__rmi_register_function_handler);
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/**
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* rmi_unregister_function_handler - unregister given RMI function handler
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* @handler: RMI handler that should be unregistered.
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*
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* This function unregisters given function handler from RMI core which
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* causes it to be unbound from the function devices.
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*/
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void rmi_unregister_function_handler(struct rmi_function_handler *handler)
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{
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driver_unregister(&handler->driver);
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}
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EXPORT_SYMBOL_GPL(rmi_unregister_function_handler);
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/* Bus specific stuff */
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static int rmi_bus_match(struct device *dev, struct device_driver *drv)
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{
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bool physical = rmi_is_physical_device(dev);
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/* First see if types are not compatible */
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if (physical != rmi_is_physical_driver(drv))
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return 0;
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return physical || rmi_function_match(dev, drv);
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}
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struct bus_type rmi_bus_type = {
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.match = rmi_bus_match,
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.name = "rmi4",
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};
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static struct rmi_function_handler *fn_handlers[] = {
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&rmi_f01_handler,
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#ifdef CONFIG_RMI4_F03
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&rmi_f03_handler,
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#endif
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#ifdef CONFIG_RMI4_F11
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&rmi_f11_handler,
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#endif
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#ifdef CONFIG_RMI4_F12
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&rmi_f12_handler,
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#endif
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#ifdef CONFIG_RMI4_F30
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&rmi_f30_handler,
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#endif
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#ifdef CONFIG_RMI4_F34
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&rmi_f34_handler,
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#endif
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#ifdef CONFIG_RMI4_F3A
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&rmi_f3a_handler,
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#endif
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#ifdef CONFIG_RMI4_F54
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&rmi_f54_handler,
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#endif
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#ifdef CONFIG_RMI4_F55
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&rmi_f55_handler,
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#endif
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};
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static void __rmi_unregister_function_handlers(int start_idx)
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{
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int i;
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for (i = start_idx; i >= 0; i--)
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rmi_unregister_function_handler(fn_handlers[i]);
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}
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static void rmi_unregister_function_handlers(void)
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{
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__rmi_unregister_function_handlers(ARRAY_SIZE(fn_handlers) - 1);
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}
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static int rmi_register_function_handlers(void)
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{
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int ret;
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int i;
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for (i = 0; i < ARRAY_SIZE(fn_handlers); i++) {
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ret = rmi_register_function_handler(fn_handlers[i]);
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if (ret) {
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pr_err("%s: error registering the RMI F%02x handler: %d\n",
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__func__, fn_handlers[i]->func, ret);
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goto err_unregister_function_handlers;
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}
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}
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return 0;
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err_unregister_function_handlers:
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__rmi_unregister_function_handlers(i - 1);
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return ret;
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}
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int rmi_of_property_read_u32(struct device *dev, u32 *result,
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const char *prop, bool optional)
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{
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int retval;
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u32 val = 0;
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retval = of_property_read_u32(dev->of_node, prop, &val);
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if (retval && (!optional && retval == -EINVAL)) {
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dev_err(dev, "Failed to get %s value: %d\n",
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prop, retval);
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return retval;
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}
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*result = val;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rmi_of_property_read_u32);
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static int __init rmi_bus_init(void)
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{
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int error;
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error = bus_register(&rmi_bus_type);
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if (error) {
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pr_err("%s: error registering the RMI bus: %d\n",
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__func__, error);
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return error;
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}
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error = rmi_register_function_handlers();
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if (error)
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goto err_unregister_bus;
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error = rmi_register_physical_driver();
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if (error) {
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pr_err("%s: error registering the RMI physical driver: %d\n",
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__func__, error);
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goto err_unregister_bus;
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}
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return 0;
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err_unregister_bus:
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bus_unregister(&rmi_bus_type);
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return error;
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}
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module_init(rmi_bus_init);
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static void __exit rmi_bus_exit(void)
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{
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/*
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* We should only ever get here if all drivers are unloaded, so
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* all we have to do at this point is unregister ourselves.
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*/
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rmi_unregister_physical_driver();
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rmi_unregister_function_handlers();
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bus_unregister(&rmi_bus_type);
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}
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module_exit(rmi_bus_exit);
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MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com");
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MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com");
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MODULE_DESCRIPTION("RMI bus");
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MODULE_LICENSE("GPL");
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