![Nick Dyer](/assets/img/avatar_default.png)
When IRQ handling was moved to rmi_driver in 3aeed5b
the naming of the
interrupt changed from "rmi4_i2c" to "2-0020" (or similar). This patch
restores the previous behaviour and makes the interrupt easier to identify
in /proc/interrupts.
Signed-off-by: Nick Dyer <nick@shmanahar.org>
Tested-by: Chris Healy <cphealy@gmail.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1291 lines
31 KiB
C
1291 lines
31 KiB
C
/*
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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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* This driver provides the core support for a single RMI4-based device.
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*
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* The RMI4 specification can be found here (URL split for line length):
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*
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* http://www.synaptics.com/sites/default/files/
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* 511-000136-01-Rev-E-RMI4-Interfacing-Guide.pdf
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/bitmap.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/irq.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <uapi/linux/input.h>
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#include <linux/rmi.h>
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#include "rmi_bus.h"
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#include "rmi_driver.h"
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#define HAS_NONSTANDARD_PDT_MASK 0x40
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#define RMI4_MAX_PAGE 0xff
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#define RMI4_PAGE_SIZE 0x100
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#define RMI4_PAGE_MASK 0xFF00
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#define RMI_DEVICE_RESET_CMD 0x01
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#define DEFAULT_RESET_DELAY_MS 100
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void rmi_free_function_list(struct rmi_device *rmi_dev)
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{
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struct rmi_function *fn, *tmp;
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n");
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devm_kfree(&rmi_dev->dev, data->irq_memory);
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data->irq_memory = NULL;
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data->irq_status = NULL;
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data->fn_irq_bits = NULL;
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data->current_irq_mask = NULL;
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data->new_irq_mask = NULL;
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data->f01_container = NULL;
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data->f34_container = NULL;
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/* Doing it in the reverse order so F01 will be removed last */
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list_for_each_entry_safe_reverse(fn, tmp,
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&data->function_list, node) {
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list_del(&fn->node);
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rmi_unregister_function(fn);
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}
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}
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static int reset_one_function(struct rmi_function *fn)
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{
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struct rmi_function_handler *fh;
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int retval = 0;
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if (!fn || !fn->dev.driver)
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return 0;
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fh = to_rmi_function_handler(fn->dev.driver);
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if (fh->reset) {
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retval = fh->reset(fn);
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if (retval < 0)
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dev_err(&fn->dev, "Reset failed with code %d.\n",
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retval);
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}
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return retval;
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}
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static int configure_one_function(struct rmi_function *fn)
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{
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struct rmi_function_handler *fh;
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int retval = 0;
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if (!fn || !fn->dev.driver)
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return 0;
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fh = to_rmi_function_handler(fn->dev.driver);
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if (fh->config) {
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retval = fh->config(fn);
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if (retval < 0)
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dev_err(&fn->dev, "Config failed with code %d.\n",
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retval);
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}
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return retval;
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}
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static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct rmi_function *entry;
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int retval;
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list_for_each_entry(entry, &data->function_list, node) {
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retval = reset_one_function(entry);
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct rmi_function *entry;
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int retval;
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list_for_each_entry(entry, &data->function_list, node) {
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retval = configure_one_function(entry);
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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static void process_one_interrupt(struct rmi_driver_data *data,
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struct rmi_function *fn)
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{
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struct rmi_function_handler *fh;
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if (!fn || !fn->dev.driver)
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return;
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fh = to_rmi_function_handler(fn->dev.driver);
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if (fh->attention) {
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bitmap_and(data->fn_irq_bits, data->irq_status, fn->irq_mask,
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data->irq_count);
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if (!bitmap_empty(data->fn_irq_bits, data->irq_count))
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fh->attention(fn, data->fn_irq_bits);
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}
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}
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static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct device *dev = &rmi_dev->dev;
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struct rmi_function *entry;
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int error;
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if (!data)
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return 0;
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if (!data->attn_data.data) {
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error = rmi_read_block(rmi_dev,
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data->f01_container->fd.data_base_addr + 1,
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data->irq_status, data->num_of_irq_regs);
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if (error < 0) {
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dev_err(dev, "Failed to read irqs, code=%d\n", error);
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return error;
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}
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}
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mutex_lock(&data->irq_mutex);
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bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask,
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data->irq_count);
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/*
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* At this point, irq_status has all bits that are set in the
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* interrupt status register and are enabled.
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*/
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mutex_unlock(&data->irq_mutex);
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/*
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* It would be nice to be able to use irq_chip to handle these
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* nested IRQs. Unfortunately, most of the current customers for
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* this driver are using older kernels (3.0.x) that don't support
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* the features required for that. Once they've shifted to more
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* recent kernels (say, 3.3 and higher), this should be switched to
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* use irq_chip.
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*/
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list_for_each_entry(entry, &data->function_list, node)
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process_one_interrupt(data, entry);
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if (data->input)
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input_sync(data->input);
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return 0;
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}
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void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
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void *data, size_t size)
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{
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struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
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struct rmi4_attn_data attn_data;
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void *fifo_data;
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if (!drvdata->enabled)
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return;
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fifo_data = kmemdup(data, size, GFP_ATOMIC);
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if (!fifo_data)
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return;
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attn_data.irq_status = irq_status;
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attn_data.size = size;
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attn_data.data = fifo_data;
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kfifo_put(&drvdata->attn_fifo, attn_data);
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}
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EXPORT_SYMBOL_GPL(rmi_set_attn_data);
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static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
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{
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struct rmi_device *rmi_dev = dev_id;
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struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
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struct rmi4_attn_data attn_data = {0};
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int ret, count;
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count = kfifo_get(&drvdata->attn_fifo, &attn_data);
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if (count) {
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*(drvdata->irq_status) = attn_data.irq_status;
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drvdata->attn_data = attn_data;
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}
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ret = rmi_process_interrupt_requests(rmi_dev);
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if (ret)
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rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev,
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"Failed to process interrupt request: %d\n", ret);
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if (count)
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kfree(attn_data.data);
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if (!kfifo_is_empty(&drvdata->attn_fifo))
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return rmi_irq_fn(irq, dev_id);
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return IRQ_HANDLED;
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}
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static int rmi_irq_init(struct rmi_device *rmi_dev)
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{
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struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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int irq_flags = irq_get_trigger_type(pdata->irq);
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int ret;
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if (!irq_flags)
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irq_flags = IRQF_TRIGGER_LOW;
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ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL,
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rmi_irq_fn, irq_flags | IRQF_ONESHOT,
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dev_driver_string(rmi_dev->xport->dev),
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rmi_dev);
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if (ret < 0) {
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dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",
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pdata->irq);
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return ret;
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}
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data->enabled = true;
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return 0;
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}
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struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct rmi_function *entry;
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list_for_each_entry(entry, &data->function_list, node) {
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if (entry->fd.function_number == number)
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return entry;
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}
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return NULL;
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}
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static int suspend_one_function(struct rmi_function *fn)
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{
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struct rmi_function_handler *fh;
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int retval = 0;
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if (!fn || !fn->dev.driver)
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return 0;
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fh = to_rmi_function_handler(fn->dev.driver);
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if (fh->suspend) {
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retval = fh->suspend(fn);
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if (retval < 0)
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dev_err(&fn->dev, "Suspend failed with code %d.\n",
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retval);
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}
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return retval;
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}
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static int rmi_suspend_functions(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct rmi_function *entry;
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int retval;
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list_for_each_entry(entry, &data->function_list, node) {
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retval = suspend_one_function(entry);
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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static int resume_one_function(struct rmi_function *fn)
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{
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struct rmi_function_handler *fh;
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int retval = 0;
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if (!fn || !fn->dev.driver)
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return 0;
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fh = to_rmi_function_handler(fn->dev.driver);
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if (fh->resume) {
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retval = fh->resume(fn);
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if (retval < 0)
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dev_err(&fn->dev, "Resume failed with code %d.\n",
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retval);
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}
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return retval;
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}
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static int rmi_resume_functions(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct rmi_function *entry;
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int retval;
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list_for_each_entry(entry, &data->function_list, node) {
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retval = resume_one_function(entry);
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if (retval < 0)
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return retval;
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}
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return 0;
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}
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int rmi_enable_sensor(struct rmi_device *rmi_dev)
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{
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int retval = 0;
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retval = rmi_driver_process_config_requests(rmi_dev);
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if (retval < 0)
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return retval;
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return rmi_process_interrupt_requests(rmi_dev);
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}
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/**
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* rmi_driver_set_input_params - set input device id and other data.
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*
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* @rmi_dev: Pointer to an RMI device
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* @input: Pointer to input device
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*
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*/
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static int rmi_driver_set_input_params(struct rmi_device *rmi_dev,
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struct input_dev *input)
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{
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input->name = SYNAPTICS_INPUT_DEVICE_NAME;
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input->id.vendor = SYNAPTICS_VENDOR_ID;
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input->id.bustype = BUS_RMI;
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return 0;
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}
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static void rmi_driver_set_input_name(struct rmi_device *rmi_dev,
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struct input_dev *input)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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const char *device_name = rmi_f01_get_product_ID(data->f01_container);
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char *name;
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name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL,
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"Synaptics %s", device_name);
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if (!name)
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return;
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input->name = name;
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}
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static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev,
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unsigned long *mask)
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{
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int error = 0;
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct device *dev = &rmi_dev->dev;
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mutex_lock(&data->irq_mutex);
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bitmap_or(data->new_irq_mask,
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data->current_irq_mask, mask, data->irq_count);
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error = rmi_write_block(rmi_dev,
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data->f01_container->fd.control_base_addr + 1,
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data->new_irq_mask, data->num_of_irq_regs);
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if (error < 0) {
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dev_err(dev, "%s: Failed to change enabled interrupts!",
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__func__);
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goto error_unlock;
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}
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bitmap_copy(data->current_irq_mask, data->new_irq_mask,
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data->num_of_irq_regs);
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error_unlock:
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mutex_unlock(&data->irq_mutex);
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return error;
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}
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static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev,
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unsigned long *mask)
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{
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int error = 0;
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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struct device *dev = &rmi_dev->dev;
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mutex_lock(&data->irq_mutex);
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bitmap_andnot(data->new_irq_mask,
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data->current_irq_mask, mask, data->irq_count);
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error = rmi_write_block(rmi_dev,
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data->f01_container->fd.control_base_addr + 1,
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data->new_irq_mask, data->num_of_irq_regs);
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if (error < 0) {
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dev_err(dev, "%s: Failed to change enabled interrupts!",
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__func__);
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goto error_unlock;
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}
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bitmap_copy(data->current_irq_mask, data->new_irq_mask,
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data->num_of_irq_regs);
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error_unlock:
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mutex_unlock(&data->irq_mutex);
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return error;
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}
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static int rmi_driver_reset_handler(struct rmi_device *rmi_dev)
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{
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struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
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int error;
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|
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/*
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* Can get called before the driver is fully ready to deal with
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* this situation.
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*/
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if (!data || !data->f01_container) {
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dev_warn(&rmi_dev->dev,
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"Not ready to handle reset yet!\n");
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return 0;
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}
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error = rmi_read_block(rmi_dev,
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data->f01_container->fd.control_base_addr + 1,
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data->current_irq_mask, data->num_of_irq_regs);
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if (error < 0) {
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dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n",
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__func__);
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return error;
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}
|
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|
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error = rmi_driver_process_reset_requests(rmi_dev);
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if (error < 0)
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return error;
|
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|
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error = rmi_driver_process_config_requests(rmi_dev);
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if (error < 0)
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return error;
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|
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return 0;
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}
|
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|
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static int rmi_read_pdt_entry(struct rmi_device *rmi_dev,
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struct pdt_entry *entry, u16 pdt_address)
|
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{
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u8 buf[RMI_PDT_ENTRY_SIZE];
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int error;
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error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE);
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if (error) {
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dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n",
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pdt_address, error);
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return error;
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}
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entry->page_start = pdt_address & RMI4_PAGE_MASK;
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entry->query_base_addr = buf[0];
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entry->command_base_addr = buf[1];
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entry->control_base_addr = buf[2];
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entry->data_base_addr = buf[3];
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entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK;
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entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5;
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entry->function_number = buf[5];
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return 0;
|
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}
|
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|
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static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt,
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struct rmi_function_descriptor *fd)
|
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{
|
|
fd->query_base_addr = pdt->query_base_addr + pdt->page_start;
|
|
fd->command_base_addr = pdt->command_base_addr + pdt->page_start;
|
|
fd->control_base_addr = pdt->control_base_addr + pdt->page_start;
|
|
fd->data_base_addr = pdt->data_base_addr + pdt->page_start;
|
|
fd->function_number = pdt->function_number;
|
|
fd->interrupt_source_count = pdt->interrupt_source_count;
|
|
fd->function_version = pdt->function_version;
|
|
}
|
|
|
|
#define RMI_SCAN_CONTINUE 0
|
|
#define RMI_SCAN_DONE 1
|
|
|
|
static int rmi_scan_pdt_page(struct rmi_device *rmi_dev,
|
|
int page,
|
|
int *empty_pages,
|
|
void *ctx,
|
|
int (*callback)(struct rmi_device *rmi_dev,
|
|
void *ctx,
|
|
const struct pdt_entry *entry))
|
|
{
|
|
struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
|
|
struct pdt_entry pdt_entry;
|
|
u16 page_start = RMI4_PAGE_SIZE * page;
|
|
u16 pdt_start = page_start + PDT_START_SCAN_LOCATION;
|
|
u16 pdt_end = page_start + PDT_END_SCAN_LOCATION;
|
|
u16 addr;
|
|
int error;
|
|
int retval;
|
|
|
|
for (addr = pdt_start; addr >= pdt_end; addr -= RMI_PDT_ENTRY_SIZE) {
|
|
error = rmi_read_pdt_entry(rmi_dev, &pdt_entry, addr);
|
|
if (error)
|
|
return error;
|
|
|
|
if (RMI4_END_OF_PDT(pdt_entry.function_number))
|
|
break;
|
|
|
|
retval = callback(rmi_dev, ctx, &pdt_entry);
|
|
if (retval != RMI_SCAN_CONTINUE)
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Count number of empty PDT pages. If a gap of two pages
|
|
* or more is found, stop scanning.
|
|
*/
|
|
if (addr == pdt_start)
|
|
++*empty_pages;
|
|
else
|
|
*empty_pages = 0;
|
|
|
|
return (data->bootloader_mode || *empty_pages >= 2) ?
|
|
RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
|
|
}
|
|
|
|
int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx,
|
|
int (*callback)(struct rmi_device *rmi_dev,
|
|
void *ctx, const struct pdt_entry *entry))
|
|
{
|
|
int page;
|
|
int empty_pages = 0;
|
|
int retval = RMI_SCAN_DONE;
|
|
|
|
for (page = 0; page <= RMI4_MAX_PAGE; page++) {
|
|
retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages,
|
|
ctx, callback);
|
|
if (retval != RMI_SCAN_CONTINUE)
|
|
break;
|
|
}
|
|
|
|
return retval < 0 ? retval : 0;
|
|
}
|
|
|
|
int rmi_read_register_desc(struct rmi_device *d, u16 addr,
|
|
struct rmi_register_descriptor *rdesc)
|
|
{
|
|
int ret;
|
|
u8 size_presence_reg;
|
|
u8 buf[35];
|
|
int presense_offset = 1;
|
|
u8 *struct_buf;
|
|
int reg;
|
|
int offset = 0;
|
|
int map_offset = 0;
|
|
int i;
|
|
int b;
|
|
|
|
/*
|
|
* The first register of the register descriptor is the size of
|
|
* the register descriptor's presense register.
|
|
*/
|
|
ret = rmi_read(d, addr, &size_presence_reg);
|
|
if (ret)
|
|
return ret;
|
|
++addr;
|
|
|
|
if (size_presence_reg < 0 || size_presence_reg > 35)
|
|
return -EIO;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
/*
|
|
* The presence register contains the size of the register structure
|
|
* and a bitmap which identified which packet registers are present
|
|
* for this particular register type (ie query, control, or data).
|
|
*/
|
|
ret = rmi_read_block(d, addr, buf, size_presence_reg);
|
|
if (ret)
|
|
return ret;
|
|
++addr;
|
|
|
|
if (buf[0] == 0) {
|
|
presense_offset = 3;
|
|
rdesc->struct_size = buf[1] | (buf[2] << 8);
|
|
} else {
|
|
rdesc->struct_size = buf[0];
|
|
}
|
|
|
|
for (i = presense_offset; i < size_presence_reg; i++) {
|
|
for (b = 0; b < 8; b++) {
|
|
if (buf[i] & (0x1 << b))
|
|
bitmap_set(rdesc->presense_map, map_offset, 1);
|
|
++map_offset;
|
|
}
|
|
}
|
|
|
|
rdesc->num_registers = bitmap_weight(rdesc->presense_map,
|
|
RMI_REG_DESC_PRESENSE_BITS);
|
|
|
|
rdesc->registers = devm_kzalloc(&d->dev, rdesc->num_registers *
|
|
sizeof(struct rmi_register_desc_item),
|
|
GFP_KERNEL);
|
|
if (!rdesc->registers)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Allocate a temporary buffer to hold the register structure.
|
|
* I'm not using devm_kzalloc here since it will not be retained
|
|
* after exiting this function
|
|
*/
|
|
struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL);
|
|
if (!struct_buf)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* The register structure contains information about every packet
|
|
* register of this type. This includes the size of the packet
|
|
* register and a bitmap of all subpackets contained in the packet
|
|
* register.
|
|
*/
|
|
ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size);
|
|
if (ret)
|
|
goto free_struct_buff;
|
|
|
|
reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS);
|
|
for (i = 0; i < rdesc->num_registers; i++) {
|
|
struct rmi_register_desc_item *item = &rdesc->registers[i];
|
|
int reg_size = struct_buf[offset];
|
|
|
|
++offset;
|
|
if (reg_size == 0) {
|
|
reg_size = struct_buf[offset] |
|
|
(struct_buf[offset + 1] << 8);
|
|
offset += 2;
|
|
}
|
|
|
|
if (reg_size == 0) {
|
|
reg_size = struct_buf[offset] |
|
|
(struct_buf[offset + 1] << 8) |
|
|
(struct_buf[offset + 2] << 16) |
|
|
(struct_buf[offset + 3] << 24);
|
|
offset += 4;
|
|
}
|
|
|
|
item->reg = reg;
|
|
item->reg_size = reg_size;
|
|
|
|
map_offset = 0;
|
|
|
|
do {
|
|
for (b = 0; b < 7; b++) {
|
|
if (struct_buf[offset] & (0x1 << b))
|
|
bitmap_set(item->subpacket_map,
|
|
map_offset, 1);
|
|
++map_offset;
|
|
}
|
|
} while (struct_buf[offset++] & 0x80);
|
|
|
|
item->num_subpackets = bitmap_weight(item->subpacket_map,
|
|
RMI_REG_DESC_SUBPACKET_BITS);
|
|
|
|
rmi_dbg(RMI_DEBUG_CORE, &d->dev,
|
|
"%s: reg: %d reg size: %ld subpackets: %d\n", __func__,
|
|
item->reg, item->reg_size, item->num_subpackets);
|
|
|
|
reg = find_next_bit(rdesc->presense_map,
|
|
RMI_REG_DESC_PRESENSE_BITS, reg + 1);
|
|
}
|
|
|
|
free_struct_buff:
|
|
kfree(struct_buf);
|
|
return ret;
|
|
}
|
|
|
|
const struct rmi_register_desc_item *rmi_get_register_desc_item(
|
|
struct rmi_register_descriptor *rdesc, u16 reg)
|
|
{
|
|
const struct rmi_register_desc_item *item;
|
|
int i;
|
|
|
|
for (i = 0; i < rdesc->num_registers; i++) {
|
|
item = &rdesc->registers[i];
|
|
if (item->reg == reg)
|
|
return item;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc)
|
|
{
|
|
const struct rmi_register_desc_item *item;
|
|
int i;
|
|
size_t size = 0;
|
|
|
|
for (i = 0; i < rdesc->num_registers; i++) {
|
|
item = &rdesc->registers[i];
|
|
size += item->reg_size;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/* Compute the register offset relative to the base address */
|
|
int rmi_register_desc_calc_reg_offset(
|
|
struct rmi_register_descriptor *rdesc, u16 reg)
|
|
{
|
|
const struct rmi_register_desc_item *item;
|
|
int offset = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < rdesc->num_registers; i++) {
|
|
item = &rdesc->registers[i];
|
|
if (item->reg == reg)
|
|
return offset;
|
|
++offset;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item,
|
|
u8 subpacket)
|
|
{
|
|
return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS,
|
|
subpacket) == subpacket;
|
|
}
|
|
|
|
static int rmi_check_bootloader_mode(struct rmi_device *rmi_dev,
|
|
const struct pdt_entry *pdt)
|
|
{
|
|
struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
|
|
int ret;
|
|
u8 status;
|
|
|
|
if (pdt->function_number == 0x34 && pdt->function_version > 1) {
|
|
ret = rmi_read(rmi_dev, pdt->data_base_addr, &status);
|
|
if (ret) {
|
|
dev_err(&rmi_dev->dev,
|
|
"Failed to read F34 status: %d.\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (status & BIT(7))
|
|
data->bootloader_mode = true;
|
|
} else if (pdt->function_number == 0x01) {
|
|
ret = rmi_read(rmi_dev, pdt->data_base_addr, &status);
|
|
if (ret) {
|
|
dev_err(&rmi_dev->dev,
|
|
"Failed to read F01 status: %d.\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (status & BIT(6))
|
|
data->bootloader_mode = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rmi_count_irqs(struct rmi_device *rmi_dev,
|
|
void *ctx, const struct pdt_entry *pdt)
|
|
{
|
|
int *irq_count = ctx;
|
|
int ret;
|
|
|
|
*irq_count += pdt->interrupt_source_count;
|
|
|
|
ret = rmi_check_bootloader_mode(rmi_dev, pdt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return RMI_SCAN_CONTINUE;
|
|
}
|
|
|
|
int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx,
|
|
const struct pdt_entry *pdt)
|
|
{
|
|
int error;
|
|
|
|
if (pdt->function_number == 0x01) {
|
|
u16 cmd_addr = pdt->page_start + pdt->command_base_addr;
|
|
u8 cmd_buf = RMI_DEVICE_RESET_CMD;
|
|
const struct rmi_device_platform_data *pdata =
|
|
rmi_get_platform_data(rmi_dev);
|
|
|
|
if (rmi_dev->xport->ops->reset) {
|
|
error = rmi_dev->xport->ops->reset(rmi_dev->xport,
|
|
cmd_addr);
|
|
if (error)
|
|
return error;
|
|
|
|
return RMI_SCAN_DONE;
|
|
}
|
|
|
|
rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n");
|
|
error = rmi_write_block(rmi_dev, cmd_addr, &cmd_buf, 1);
|
|
if (error) {
|
|
dev_err(&rmi_dev->dev,
|
|
"Initial reset failed. Code = %d.\n", error);
|
|
return error;
|
|
}
|
|
|
|
mdelay(pdata->reset_delay_ms ?: DEFAULT_RESET_DELAY_MS);
|
|
|
|
return RMI_SCAN_DONE;
|
|
}
|
|
|
|
/* F01 should always be on page 0. If we don't find it there, fail. */
|
|
return pdt->page_start == 0 ? RMI_SCAN_CONTINUE : -ENODEV;
|
|
}
|
|
|
|
static int rmi_create_function(struct rmi_device *rmi_dev,
|
|
void *ctx, const struct pdt_entry *pdt)
|
|
{
|
|
struct device *dev = &rmi_dev->dev;
|
|
struct rmi_driver_data *data = dev_get_drvdata(dev);
|
|
int *current_irq_count = ctx;
|
|
struct rmi_function *fn;
|
|
int i;
|
|
int error;
|
|
|
|
rmi_dbg(RMI_DEBUG_CORE, dev, "Initializing F%02X.\n",
|
|
pdt->function_number);
|
|
|
|
fn = kzalloc(sizeof(struct rmi_function) +
|
|
BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long),
|
|
GFP_KERNEL);
|
|
if (!fn) {
|
|
dev_err(dev, "Failed to allocate memory for F%02X\n",
|
|
pdt->function_number);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&fn->node);
|
|
rmi_driver_copy_pdt_to_fd(pdt, &fn->fd);
|
|
|
|
fn->rmi_dev = rmi_dev;
|
|
|
|
fn->num_of_irqs = pdt->interrupt_source_count;
|
|
fn->irq_pos = *current_irq_count;
|
|
*current_irq_count += fn->num_of_irqs;
|
|
|
|
for (i = 0; i < fn->num_of_irqs; i++)
|
|
set_bit(fn->irq_pos + i, fn->irq_mask);
|
|
|
|
error = rmi_register_function(fn);
|
|
if (error)
|
|
goto err_put_fn;
|
|
|
|
if (pdt->function_number == 0x01)
|
|
data->f01_container = fn;
|
|
else if (pdt->function_number == 0x34)
|
|
data->f34_container = fn;
|
|
|
|
list_add_tail(&fn->node, &data->function_list);
|
|
|
|
return RMI_SCAN_CONTINUE;
|
|
|
|
err_put_fn:
|
|
put_device(&fn->dev);
|
|
return error;
|
|
}
|
|
|
|
void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake)
|
|
{
|
|
struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
|
|
struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
|
|
int irq = pdata->irq;
|
|
int irq_flags;
|
|
int retval;
|
|
|
|
mutex_lock(&data->enabled_mutex);
|
|
|
|
if (data->enabled)
|
|
goto out;
|
|
|
|
enable_irq(irq);
|
|
data->enabled = true;
|
|
if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) {
|
|
retval = disable_irq_wake(irq);
|
|
if (retval)
|
|
dev_warn(&rmi_dev->dev,
|
|
"Failed to disable irq for wake: %d\n",
|
|
retval);
|
|
}
|
|
|
|
/*
|
|
* Call rmi_process_interrupt_requests() after enabling irq,
|
|
* otherwise we may lose interrupt on edge-triggered systems.
|
|
*/
|
|
irq_flags = irq_get_trigger_type(pdata->irq);
|
|
if (irq_flags & IRQ_TYPE_EDGE_BOTH)
|
|
rmi_process_interrupt_requests(rmi_dev);
|
|
|
|
out:
|
|
mutex_unlock(&data->enabled_mutex);
|
|
}
|
|
|
|
void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake)
|
|
{
|
|
struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
|
|
struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
|
|
struct rmi4_attn_data attn_data = {0};
|
|
int irq = pdata->irq;
|
|
int retval, count;
|
|
|
|
mutex_lock(&data->enabled_mutex);
|
|
|
|
if (!data->enabled)
|
|
goto out;
|
|
|
|
data->enabled = false;
|
|
disable_irq(irq);
|
|
if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) {
|
|
retval = enable_irq_wake(irq);
|
|
if (retval)
|
|
dev_warn(&rmi_dev->dev,
|
|
"Failed to enable irq for wake: %d\n",
|
|
retval);
|
|
}
|
|
|
|
/* make sure the fifo is clean */
|
|
while (!kfifo_is_empty(&data->attn_fifo)) {
|
|
count = kfifo_get(&data->attn_fifo, &attn_data);
|
|
if (count)
|
|
kfree(attn_data.data);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&data->enabled_mutex);
|
|
}
|
|
|
|
int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake)
|
|
{
|
|
int retval;
|
|
|
|
retval = rmi_suspend_functions(rmi_dev);
|
|
if (retval)
|
|
dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
|
|
retval);
|
|
|
|
rmi_disable_irq(rmi_dev, enable_wake);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rmi_driver_suspend);
|
|
|
|
int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake)
|
|
{
|
|
int retval;
|
|
|
|
rmi_enable_irq(rmi_dev, clear_wake);
|
|
|
|
retval = rmi_resume_functions(rmi_dev);
|
|
if (retval)
|
|
dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
|
|
retval);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rmi_driver_resume);
|
|
|
|
static int rmi_driver_remove(struct device *dev)
|
|
{
|
|
struct rmi_device *rmi_dev = to_rmi_device(dev);
|
|
|
|
rmi_disable_irq(rmi_dev, false);
|
|
|
|
rmi_f34_remove_sysfs(rmi_dev);
|
|
rmi_free_function_list(rmi_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static int rmi_driver_of_probe(struct device *dev,
|
|
struct rmi_device_platform_data *pdata)
|
|
{
|
|
int retval;
|
|
|
|
retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms,
|
|
"syna,reset-delay-ms", 1);
|
|
if (retval)
|
|
return retval;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int rmi_driver_of_probe(struct device *dev,
|
|
struct rmi_device_platform_data *pdata)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
int rmi_probe_interrupts(struct rmi_driver_data *data)
|
|
{
|
|
struct rmi_device *rmi_dev = data->rmi_dev;
|
|
struct device *dev = &rmi_dev->dev;
|
|
int irq_count;
|
|
size_t size;
|
|
int retval;
|
|
|
|
/*
|
|
* We need to count the IRQs and allocate their storage before scanning
|
|
* the PDT and creating the function entries, because adding a new
|
|
* function can trigger events that result in the IRQ related storage
|
|
* being accessed.
|
|
*/
|
|
rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Counting IRQs.\n", __func__);
|
|
irq_count = 0;
|
|
data->bootloader_mode = false;
|
|
|
|
retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_count_irqs);
|
|
if (retval < 0) {
|
|
dev_err(dev, "IRQ counting failed with code %d.\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
if (data->bootloader_mode)
|
|
dev_warn(dev, "Device in bootloader mode.\n");
|
|
|
|
data->irq_count = irq_count;
|
|
data->num_of_irq_regs = (data->irq_count + 7) / 8;
|
|
|
|
size = BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long);
|
|
data->irq_memory = devm_kzalloc(dev, size * 4, GFP_KERNEL);
|
|
if (!data->irq_memory) {
|
|
dev_err(dev, "Failed to allocate memory for irq masks.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data->irq_status = data->irq_memory + size * 0;
|
|
data->fn_irq_bits = data->irq_memory + size * 1;
|
|
data->current_irq_mask = data->irq_memory + size * 2;
|
|
data->new_irq_mask = data->irq_memory + size * 3;
|
|
|
|
return retval;
|
|
}
|
|
|
|
int rmi_init_functions(struct rmi_driver_data *data)
|
|
{
|
|
struct rmi_device *rmi_dev = data->rmi_dev;
|
|
struct device *dev = &rmi_dev->dev;
|
|
int irq_count;
|
|
int retval;
|
|
|
|
irq_count = 0;
|
|
rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Creating functions.\n", __func__);
|
|
retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_create_function);
|
|
if (retval < 0) {
|
|
dev_err(dev, "Function creation failed with code %d.\n",
|
|
retval);
|
|
goto err_destroy_functions;
|
|
}
|
|
|
|
if (!data->f01_container) {
|
|
dev_err(dev, "Missing F01 container!\n");
|
|
retval = -EINVAL;
|
|
goto err_destroy_functions;
|
|
}
|
|
|
|
retval = rmi_read_block(rmi_dev,
|
|
data->f01_container->fd.control_base_addr + 1,
|
|
data->current_irq_mask, data->num_of_irq_regs);
|
|
if (retval < 0) {
|
|
dev_err(dev, "%s: Failed to read current IRQ mask.\n",
|
|
__func__);
|
|
goto err_destroy_functions;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_destroy_functions:
|
|
rmi_free_function_list(rmi_dev);
|
|
return retval;
|
|
}
|
|
|
|
static int rmi_driver_probe(struct device *dev)
|
|
{
|
|
struct rmi_driver *rmi_driver;
|
|
struct rmi_driver_data *data;
|
|
struct rmi_device_platform_data *pdata;
|
|
struct rmi_device *rmi_dev;
|
|
int retval;
|
|
|
|
rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Starting probe.\n",
|
|
__func__);
|
|
|
|
if (!rmi_is_physical_device(dev)) {
|
|
rmi_dbg(RMI_DEBUG_CORE, dev, "Not a physical device.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
rmi_dev = to_rmi_device(dev);
|
|
rmi_driver = to_rmi_driver(dev->driver);
|
|
rmi_dev->driver = rmi_driver;
|
|
|
|
pdata = rmi_get_platform_data(rmi_dev);
|
|
|
|
if (rmi_dev->xport->dev->of_node) {
|
|
retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct rmi_driver_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&data->function_list);
|
|
data->rmi_dev = rmi_dev;
|
|
dev_set_drvdata(&rmi_dev->dev, data);
|
|
|
|
/*
|
|
* Right before a warm boot, the sensor might be in some unusual state,
|
|
* such as F54 diagnostics, or F34 bootloader mode after a firmware
|
|
* or configuration update. In order to clear the sensor to a known
|
|
* state and/or apply any updates, we issue a initial reset to clear any
|
|
* previous settings and force it into normal operation.
|
|
*
|
|
* We have to do this before actually building the PDT because
|
|
* the reflash updates (if any) might cause various registers to move
|
|
* around.
|
|
*
|
|
* For a number of reasons, this initial reset may fail to return
|
|
* within the specified time, but we'll still be able to bring up the
|
|
* driver normally after that failure. This occurs most commonly in
|
|
* a cold boot situation (where then firmware takes longer to come up
|
|
* than from a warm boot) and the reset_delay_ms in the platform data
|
|
* has been set too short to accommodate that. Since the sensor will
|
|
* eventually come up and be usable, we don't want to just fail here
|
|
* and leave the customer's device unusable. So we warn them, and
|
|
* continue processing.
|
|
*/
|
|
retval = rmi_scan_pdt(rmi_dev, NULL, rmi_initial_reset);
|
|
if (retval < 0)
|
|
dev_warn(dev, "RMI initial reset failed! Continuing in spite of this.\n");
|
|
|
|
retval = rmi_read(rmi_dev, PDT_PROPERTIES_LOCATION, &data->pdt_props);
|
|
if (retval < 0) {
|
|
/*
|
|
* we'll print out a warning and continue since
|
|
* failure to get the PDT properties is not a cause to fail
|
|
*/
|
|
dev_warn(dev, "Could not read PDT properties from %#06x (code %d). Assuming 0x00.\n",
|
|
PDT_PROPERTIES_LOCATION, retval);
|
|
}
|
|
|
|
mutex_init(&data->irq_mutex);
|
|
mutex_init(&data->enabled_mutex);
|
|
|
|
retval = rmi_probe_interrupts(data);
|
|
if (retval)
|
|
goto err;
|
|
|
|
if (rmi_dev->xport->input) {
|
|
/*
|
|
* The transport driver already has an input device.
|
|
* In some cases it is preferable to reuse the transport
|
|
* devices input device instead of creating a new one here.
|
|
* One example is some HID touchpads report "pass-through"
|
|
* button events are not reported by rmi registers.
|
|
*/
|
|
data->input = rmi_dev->xport->input;
|
|
} else {
|
|
data->input = devm_input_allocate_device(dev);
|
|
if (!data->input) {
|
|
dev_err(dev, "%s: Failed to allocate input device.\n",
|
|
__func__);
|
|
retval = -ENOMEM;
|
|
goto err;
|
|
}
|
|
rmi_driver_set_input_params(rmi_dev, data->input);
|
|
data->input->phys = devm_kasprintf(dev, GFP_KERNEL,
|
|
"%s/input0", dev_name(dev));
|
|
}
|
|
|
|
retval = rmi_init_functions(data);
|
|
if (retval)
|
|
goto err;
|
|
|
|
retval = rmi_f34_create_sysfs(rmi_dev);
|
|
if (retval)
|
|
goto err;
|
|
|
|
if (data->input) {
|
|
rmi_driver_set_input_name(rmi_dev, data->input);
|
|
if (!rmi_dev->xport->input) {
|
|
if (input_register_device(data->input)) {
|
|
dev_err(dev, "%s: Failed to register input device.\n",
|
|
__func__);
|
|
goto err_destroy_functions;
|
|
}
|
|
}
|
|
}
|
|
|
|
retval = rmi_irq_init(rmi_dev);
|
|
if (retval < 0)
|
|
goto err_destroy_functions;
|
|
|
|
if (data->f01_container->dev.driver) {
|
|
/* Driver already bound, so enable ATTN now. */
|
|
retval = rmi_enable_sensor(rmi_dev);
|
|
if (retval)
|
|
goto err_disable_irq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_disable_irq:
|
|
rmi_disable_irq(rmi_dev, false);
|
|
err_destroy_functions:
|
|
rmi_free_function_list(rmi_dev);
|
|
err:
|
|
return retval;
|
|
}
|
|
|
|
static struct rmi_driver rmi_physical_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "rmi4_physical",
|
|
.bus = &rmi_bus_type,
|
|
.probe = rmi_driver_probe,
|
|
.remove = rmi_driver_remove,
|
|
},
|
|
.reset_handler = rmi_driver_reset_handler,
|
|
.clear_irq_bits = rmi_driver_clear_irq_bits,
|
|
.set_irq_bits = rmi_driver_set_irq_bits,
|
|
.set_input_params = rmi_driver_set_input_params,
|
|
};
|
|
|
|
bool rmi_is_physical_driver(struct device_driver *drv)
|
|
{
|
|
return drv == &rmi_physical_driver.driver;
|
|
}
|
|
|
|
int __init rmi_register_physical_driver(void)
|
|
{
|
|
int error;
|
|
|
|
error = driver_register(&rmi_physical_driver.driver);
|
|
if (error) {
|
|
pr_err("%s: driver register failed, code=%d.\n", __func__,
|
|
error);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __exit rmi_unregister_physical_driver(void)
|
|
{
|
|
driver_unregister(&rmi_physical_driver.driver);
|
|
}
|