rmi_driver.c 31.3 KB
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/*
 * Copyright (c) 2011-2016 Synaptics Incorporated
 * Copyright (c) 2011 Unixphere
 *
 * This driver provides the core support for a single RMI4-based device.
 *
 * The RMI4 specification can be found here (URL split for line length):
 *
 * http://www.synaptics.com/sites/default/files/
 *      511-000136-01-Rev-E-RMI4-Interfacing-Guide.pdf
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/bitmap.h>
#include <linux/delay.h>
#include <linux/fs.h>
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#include <linux/irq.h>
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#include <linux/pm.h>
#include <linux/slab.h>
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#include <linux/of.h>
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#include <uapi/linux/input.h>
#include <linux/rmi.h>
#include "rmi_bus.h"
#include "rmi_driver.h"

#define HAS_NONSTANDARD_PDT_MASK 0x40
#define RMI4_MAX_PAGE 0xff
#define RMI4_PAGE_SIZE 0x100
#define RMI4_PAGE_MASK 0xFF00

#define RMI_DEVICE_RESET_CMD	0x01
#define DEFAULT_RESET_DELAY_MS	100

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void rmi_free_function_list(struct rmi_device *rmi_dev)
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{
	struct rmi_function *fn, *tmp;
	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);
	data->irq_memory = NULL;
	data->irq_status = NULL;
	data->fn_irq_bits = NULL;
	data->current_irq_mask = NULL;
	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 */
	list_for_each_entry_safe_reverse(fn, tmp,
					 &data->function_list, node) {
		list_del(&fn->node);
		rmi_unregister_function(fn);
	}
}

static int reset_one_function(struct rmi_function *fn)
{
	struct rmi_function_handler *fh;
	int retval = 0;

	if (!fn || !fn->dev.driver)
		return 0;

	fh = to_rmi_function_handler(fn->dev.driver);
	if (fh->reset) {
		retval = fh->reset(fn);
		if (retval < 0)
			dev_err(&fn->dev, "Reset failed with code %d.\n",
				retval);
	}

	return retval;
}

static int configure_one_function(struct rmi_function *fn)
{
	struct rmi_function_handler *fh;
	int retval = 0;

	if (!fn || !fn->dev.driver)
		return 0;

	fh = to_rmi_function_handler(fn->dev.driver);
	if (fh->config) {
		retval = fh->config(fn);
		if (retval < 0)
			dev_err(&fn->dev, "Config failed with code %d.\n",
				retval);
	}

	return retval;
}

static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct rmi_function *entry;
	int retval;

	list_for_each_entry(entry, &data->function_list, node) {
		retval = reset_one_function(entry);
		if (retval < 0)
			return retval;
	}

	return 0;
}

static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct rmi_function *entry;
	int retval;

	list_for_each_entry(entry, &data->function_list, node) {
		retval = configure_one_function(entry);
		if (retval < 0)
			return retval;
	}

	return 0;
}

static void process_one_interrupt(struct rmi_driver_data *data,
				  struct rmi_function *fn)
{
	struct rmi_function_handler *fh;

	if (!fn || !fn->dev.driver)
		return;

	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,
				data->irq_count);
		if (!bitmap_empty(data->fn_irq_bits, data->irq_count))
			fh->attention(fn, data->fn_irq_bits);
	}
}

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static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev)
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{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct device *dev = &rmi_dev->dev;
	struct rmi_function *entry;
	int error;

	if (!data)
		return 0;

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	if (!data->attn_data.data) {
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		error = rmi_read_block(rmi_dev,
				data->f01_container->fd.data_base_addr + 1,
				data->irq_status, data->num_of_irq_regs);
		if (error < 0) {
			dev_err(dev, "Failed to read irqs, code=%d\n", error);
			return error;
		}
	}

	mutex_lock(&data->irq_mutex);
	bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask,
	       data->irq_count);
	/*
	 * At this point, irq_status has all bits that are set in the
	 * interrupt status register and are enabled.
	 */
	mutex_unlock(&data->irq_mutex);

	/*
	 * It would be nice to be able to use irq_chip to handle these
	 * nested IRQs.  Unfortunately, most of the current customers for
	 * this driver are using older kernels (3.0.x) that don't support
	 * the features required for that.  Once they've shifted to more
	 * recent kernels (say, 3.3 and higher), this should be switched to
	 * use irq_chip.
	 */
	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)
		input_sync(data->input);

	return 0;
}
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void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
		       void *data, size_t size)
{
	struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
	struct rmi4_attn_data attn_data;
	void *fifo_data;

	if (!drvdata->enabled)
		return;

	fifo_data = kmemdup(data, size, GFP_ATOMIC);
	if (!fifo_data)
		return;

	attn_data.irq_status = irq_status;
	attn_data.size = size;
	attn_data.data = fifo_data;

	kfifo_put(&drvdata->attn_fifo, attn_data);
}
EXPORT_SYMBOL_GPL(rmi_set_attn_data);

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static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
{
	struct rmi_device *rmi_dev = dev_id;
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	struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
	struct rmi4_attn_data attn_data = {0};
	int ret, count;

	count = kfifo_get(&drvdata->attn_fifo, &attn_data);
	if (count) {
		*(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);
	if (ret)
		rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev,
			"Failed to process interrupt request: %d\n", ret);

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	if (count)
		kfree(attn_data.data);

	if (!kfifo_is_empty(&drvdata->attn_fifo))
		return rmi_irq_fn(irq, dev_id);

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	return IRQ_HANDLED;
}

static int rmi_irq_init(struct rmi_device *rmi_dev)
{
	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);
	int ret;

	if (!irq_flags)
		irq_flags = IRQF_TRIGGER_LOW;

	ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL,
					rmi_irq_fn, irq_flags | IRQF_ONESHOT,
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					dev_driver_string(rmi_dev->xport->dev),
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					rmi_dev);
	if (ret < 0) {
		dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",
			pdata->irq);

		return ret;
	}

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	data->enabled = true;

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	return 0;
}
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struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct rmi_function *entry;

	list_for_each_entry(entry, &data->function_list, node) {
		if (entry->fd.function_number == number)
			return entry;
	}

	return NULL;
}

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static int suspend_one_function(struct rmi_function *fn)
{
	struct rmi_function_handler *fh;
	int retval = 0;

	if (!fn || !fn->dev.driver)
		return 0;

	fh = to_rmi_function_handler(fn->dev.driver);
	if (fh->suspend) {
		retval = fh->suspend(fn);
		if (retval < 0)
			dev_err(&fn->dev, "Suspend failed with code %d.\n",
				retval);
	}

	return retval;
}

static int rmi_suspend_functions(struct rmi_device *rmi_dev)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct rmi_function *entry;
	int retval;

	list_for_each_entry(entry, &data->function_list, node) {
		retval = suspend_one_function(entry);
		if (retval < 0)
			return retval;
	}

	return 0;
}

static int resume_one_function(struct rmi_function *fn)
{
	struct rmi_function_handler *fh;
	int retval = 0;

	if (!fn || !fn->dev.driver)
		return 0;

	fh = to_rmi_function_handler(fn->dev.driver);
	if (fh->resume) {
		retval = fh->resume(fn);
		if (retval < 0)
			dev_err(&fn->dev, "Resume failed with code %d.\n",
				retval);
	}

	return retval;
}

static int rmi_resume_functions(struct rmi_device *rmi_dev)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct rmi_function *entry;
	int retval;

	list_for_each_entry(entry, &data->function_list, node) {
		retval = resume_one_function(entry);
		if (retval < 0)
			return retval;
	}

	return 0;
}

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int rmi_enable_sensor(struct rmi_device *rmi_dev)
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{
	int retval = 0;

	retval = rmi_driver_process_config_requests(rmi_dev);
	if (retval < 0)
		return retval;

	return rmi_process_interrupt_requests(rmi_dev);
}

/**
 * rmi_driver_set_input_params - set input device id and other data.
 *
 * @rmi_dev: Pointer to an RMI device
 * @input: Pointer to input device
 *
 */
static int rmi_driver_set_input_params(struct rmi_device *rmi_dev,
				struct input_dev *input)
{
	input->name = SYNAPTICS_INPUT_DEVICE_NAME;
	input->id.vendor  = SYNAPTICS_VENDOR_ID;
	input->id.bustype = BUS_RMI;
	return 0;
}

static void rmi_driver_set_input_name(struct rmi_device *rmi_dev,
				struct input_dev *input)
{
	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;

	name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL,
			      "Synaptics %s", device_name);
	if (!name)
		return;

	input->name = name;
}

static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev,
				   unsigned long *mask)
{
	int error = 0;
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct device *dev = &rmi_dev->dev;

	mutex_lock(&data->irq_mutex);
	bitmap_or(data->new_irq_mask,
		  data->current_irq_mask, mask, data->irq_count);

	error = rmi_write_block(rmi_dev,
			data->f01_container->fd.control_base_addr + 1,
			data->new_irq_mask, data->num_of_irq_regs);
	if (error < 0) {
		dev_err(dev, "%s: Failed to change enabled interrupts!",
							__func__);
		goto error_unlock;
	}
	bitmap_copy(data->current_irq_mask, data->new_irq_mask,
		    data->num_of_irq_regs);

error_unlock:
	mutex_unlock(&data->irq_mutex);
	return error;
}

static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev,
				     unsigned long *mask)
{
	int error = 0;
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	struct device *dev = &rmi_dev->dev;

	mutex_lock(&data->irq_mutex);
	bitmap_andnot(data->new_irq_mask,
		  data->current_irq_mask, mask, data->irq_count);

	error = rmi_write_block(rmi_dev,
			data->f01_container->fd.control_base_addr + 1,
			data->new_irq_mask, data->num_of_irq_regs);
	if (error < 0) {
		dev_err(dev, "%s: Failed to change enabled interrupts!",
							__func__);
		goto error_unlock;
	}
	bitmap_copy(data->current_irq_mask, data->new_irq_mask,
		    data->num_of_irq_regs);

error_unlock:
	mutex_unlock(&data->irq_mutex);
	return error;
}

static int rmi_driver_reset_handler(struct rmi_device *rmi_dev)
{
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	int error;

	/*
	 * Can get called before the driver is fully ready to deal with
	 * this situation.
	 */
	if (!data || !data->f01_container) {
		dev_warn(&rmi_dev->dev,
			 "Not ready to handle reset yet!\n");
		return 0;
	}

	error = rmi_read_block(rmi_dev,
			       data->f01_container->fd.control_base_addr + 1,
			       data->current_irq_mask, data->num_of_irq_regs);
	if (error < 0) {
		dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n",
			__func__);
		return error;
	}

	error = rmi_driver_process_reset_requests(rmi_dev);
	if (error < 0)
		return error;

	error = rmi_driver_process_config_requests(rmi_dev);
	if (error < 0)
		return error;

	return 0;
}

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static int rmi_read_pdt_entry(struct rmi_device *rmi_dev,
			      struct pdt_entry *entry, u16 pdt_address)
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{
	u8 buf[RMI_PDT_ENTRY_SIZE];
	int error;

	error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE);
	if (error) {
		dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n",
				pdt_address, error);
		return error;
	}

	entry->page_start = pdt_address & RMI4_PAGE_MASK;
	entry->query_base_addr = buf[0];
	entry->command_base_addr = buf[1];
	entry->control_base_addr = buf[2];
	entry->data_base_addr = buf[3];
	entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK;
	entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5;
	entry->function_number = buf[5];

	return 0;
}

static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt,
				      struct rmi_function_descriptor *fd)
{
	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,
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			     int *empty_pages,
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			     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;
	}

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	/*
	 * 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;

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	return (data->bootloader_mode || *empty_pages >= 2) ?
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					RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
}

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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))
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{
	int page;
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	int empty_pages = 0;
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	int retval = RMI_SCAN_DONE;

	for (page = 0; page <= RMI4_MAX_PAGE; page++) {
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		retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages,
					   ctx, callback);
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		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;

685
686
		map_offset = 0;

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689
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766
		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)
{
767
768
769
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
	int ret;
	u8 status;
770

771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
	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;
791
792
	}

793
	return 0;
794
795
796
797
798
799
}

static int rmi_count_irqs(struct rmi_device *rmi_dev,
			 void *ctx, const struct pdt_entry *pdt)
{
	int *irq_count = ctx;
800
	int ret;
801
802

	*irq_count += pdt->interrupt_source_count;
803
804
805
806

	ret = rmi_check_bootloader_mode(rmi_dev, pdt);
	if (ret < 0)
		return ret;
807
808
809
810

	return RMI_SCAN_CONTINUE;
}

811
812
int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx,
		      const struct pdt_entry *pdt)
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
{
	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;
		}

831
		rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n");
832
833
834
835
836
837
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839
840
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843
844
845
846
847
848
849
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851
		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;
852
	struct rmi_driver_data *data = dev_get_drvdata(dev);
853
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859
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862
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864
865
866
867
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870
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877
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885
886
887
	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;
888
889
	else if (pdt->function_number == 0x34)
		data->f34_container = fn;
890
891
892
893
894
895
896
897
898
899

	list_add_tail(&fn->node, &data->function_list);

	return RMI_SCAN_CONTINUE;

err_put_fn:
	put_device(&fn->dev);
	return error;
}

900
void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake)
901
{
902
	struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev);
903
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);
904
	int irq = pdata->irq;
905
906
	int irq_flags;
	int retval;
907

908
909
910
911
912
913
914
915
916
	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);
917
		if (retval)
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
			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);
939
	struct rmi4_attn_data attn_data = {0};
940
	int irq = pdata->irq;
941
	int retval, count;
942
943
944
945
946

	mutex_lock(&data->enabled_mutex);

	if (!data->enabled)
		goto out;
947

948
	data->enabled = false;
949
950
951
	disable_irq(irq);
	if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) {
		retval = enable_irq_wake(irq);
952
		if (retval)
953
954
955
956
			dev_warn(&rmi_dev->dev,
				 "Failed to enable irq for wake: %d\n",
				 retval);
	}
957

958
959
960
961
962
963
964
	/* 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);
	}

965
966
967
968
969
970
971
out:
	mutex_unlock(&data->enabled_mutex);
}

int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake)
{
	int retval;
972
973
974
975
976
977

	retval = rmi_suspend_functions(rmi_dev);
	if (retval)
		dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n",
			retval);

978
	rmi_disable_irq(rmi_dev, enable_wake);
979
980
981
982
	return retval;
}
EXPORT_SYMBOL_GPL(rmi_driver_suspend);

983
int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake)
984
985
986
{
	int retval;

987
	rmi_enable_irq(rmi_dev, clear_wake);
988

989
990
991
992
993
994
995
996
997
998
999
1000
1001
	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);

1002
	rmi_disable_irq(rmi_dev, false);
1003

1004
	rmi_f34_remove_sysfs(rmi_dev);
1005
1006
1007
1008
1009
	rmi_free_function_list(rmi_dev);

	return 0;
}

1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
#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

1031
int rmi_probe_interrupts(struct rmi_driver_data *data)
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
{
	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;
1047
1048
	data->bootloader_mode = false;

1049
1050
1051
1052
1053
	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;
	}
1054

1055
	if (data->bootloader_mode)
1056
		dev_warn(dev, "Device in bootloader mode.\n");
1057

1058
1059
1060
1061
	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);
1062
1063
	data->irq_memory = devm_kzalloc(dev, size * 4, GFP_KERNEL);
	if (!data->irq_memory) {
1064
		dev_err(dev, "Failed to allocate memory for irq masks.\n");
1065
		return -ENOMEM;
1066
1067
	}

1068
1069
1070
1071
	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;
1072
1073
1074
1075

	return retval;
}

1076
int rmi_init_functions(struct rmi_driver_data *data)
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
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1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
{
	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;
}

1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
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);

1136
1137
1138
1139
1140
1141
	if (rmi_dev->xport->dev->of_node) {
		retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata);
		if (retval)
			return retval;
	}

1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
	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);
1186
	mutex_init(&data->enabled_mutex);
1187

1188
1189
	retval = rmi_probe_interrupts(data);
	if (retval)
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
		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;
1207
			goto err;
1208
1209
1210
1211
1212
1213
		}
		rmi_driver_set_input_params(rmi_dev, data->input);
		data->input->phys = devm_kasprintf(dev, GFP_KERNEL,
						"%s/input0", dev_name(dev));
	}

1214
1215
1216
	retval = rmi_init_functions(data);
	if (retval)
		goto err;
1217

1218
1219
1220
	retval = rmi_f34_create_sysfs(rmi_dev);
	if (retval)
		goto err;
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232

	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;
			}
		}
	}

1233
1234
1235
1236
	retval = rmi_irq_init(rmi_dev);
	if (retval < 0)
		goto err_destroy_functions;

1237
	if (data->f01_container->dev.driver) {
1238
		/* Driver already bound, so enable ATTN now. */
1239
1240
1241
1242
		retval = rmi_enable_sensor(rmi_dev);
		if (retval)
			goto err_disable_irq;
	}
1243
1244
1245

	return 0;

1246
1247
err_disable_irq:
	rmi_disable_irq(rmi_dev, false);
1248
1249
1250
err_destroy_functions:
	rmi_free_function_list(rmi_dev);
err:
1251
	return retval;
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
}

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);
}