Release 4.11 drivers/input/rmi4/rmi_driver.c

/*
 * 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>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/of.h>
#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



void rmi_free_function_list(struct rmi_device *rmi_dev)
{
	struct rmi_function *fn, *tmp;
	struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev);

	rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n");

	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;

	data->f01_container = NULL;
	data->f34_container = NULL;

	/* 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);
	}
}

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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;
}

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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;
}

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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;
}

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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;
}

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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);
	if (fh->attention) {
		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)
{
	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;

	if (!data->attn_data.data) {
		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)
		process_one_interrupt(data, entry);

	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);
}
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EXPORT_SYMBOL_GPL(rmi_set_attn_data);



static irqreturn_t rmi_irq_fn(int irq, void *dev_id)
{
	struct rmi_device *rmi_dev = dev_id;
	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;
		drvdata->attn_data = attn_data;
	}

	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);

	if (count)
		kfree(attn_data.data);

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

	return IRQ_HANDLED;
}

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static int rmi_irq_init(struct rmi_device *rmi_dev)
{
	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_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,
					dev_name(rmi_dev->xport->dev),
					rmi_dev);
	if (ret < 0) {
		dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n",
			pdata->irq);

		return ret;
	}

	data->enabled = true;

	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;
}

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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;
}

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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;
}

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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)
{
	int retval = 0;

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

	return rmi_process_interrupt_requests(rmi_dev);
}

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/**
 * 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;
}

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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);
	const char *device_name = rmi_f01_get_product_ID(data->f01_container);
	char *name;

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

	input->name = name;
}

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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;
}

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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;
}

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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)
{
	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;
}

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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;
}

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#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;
}

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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))
{
	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;
}

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Andrew Duggan
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Nick Dyer
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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