Input: Add Synaptics NavPoint (PXA27x SSP/SPI) driver (ae99ea56) · Commits · e / devices / android_kernel_teracube_2e

drivers/input/mouse/Kconfig

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		@@ -339,4 +339,16 @@ config MOUSE_SYNAPTICS_USB
		To compile this driver as a module, choose M here: the
		module will be called synaptics_usb.

		config MOUSE_NAVPOINT_PXA27x
		tristate "Synaptics NavPoint (PXA27x SSP/SPI)"
		depends on PXA27x && PXA_SSP
		help
		This driver adds support for the Synaptics NavPoint touchpad connected
		to a PXA27x SSP port in SPI slave mode. The device emulates a mouse;
		a tap or tap-and-a-half drag gesture emulates the left mouse button.
		For example, use the xf86-input-evdev driver for an X pointing device.

		To compile this driver as a module, choose M here: the
		module will be called navpoint.

		endif

drivers/input/mouse/Makefile

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		@@ -12,6 +12,7 @@ obj-$(CONFIG_MOUSE_GPIO) += gpio_mouse.o
		obj-$(CONFIG_MOUSE_INPORT) += inport.o
		obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
		obj-$(CONFIG_MOUSE_MAPLE) += maplemouse.o
		obj-$(CONFIG_MOUSE_NAVPOINT_PXA27x) += navpoint.o
		obj-$(CONFIG_MOUSE_PC110PAD) += pc110pad.o
		obj-$(CONFIG_MOUSE_PS2) += psmouse.o
		obj-$(CONFIG_MOUSE_PXA930_TRKBALL) += pxa930_trkball.o

drivers/input/mouse/navpoint.c

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		/*
		* Synaptics NavPoint (PXA27x SSP/SPI) driver.
		*
		* Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
		*
		* 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/kernel.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/clk.h>
		#include <linux/delay.h>
		#include <linux/gpio.h>
		#include <linux/input.h>
		#include <linux/input/navpoint.h>
		#include <linux/interrupt.h>
		#include <linux/mutex.h>
		#include <linux/pxa2xx_ssp.h>
		#include <linux/slab.h>

		/*
		* Synaptics Modular Embedded Protocol: Module Packet Format.
		* Module header byte 2:0 = Length (# bytes that follow)
		* Module header byte 4:3 = Control
		* Module header byte 7:5 = Module Address
		*/
		#define HEADER_LENGTH(byte) ((byte) & 0x07)
		#define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03)
		#define HEADER_ADDRESS(byte) ((byte) >> 5)

		struct navpoint {
		struct ssp_device *ssp;
		struct input_dev *input;
		struct device *dev;
		int gpio;
		int index;
		u8 data[1 + HEADER_LENGTH(0xff)];
		};

		/*
		* Initialization values for SSCR0_x, SSCR1_x, SSSR_x.
		*/
		static const u32 sscr0 = 0
		\| SSCR0_TUM /* TIM = 1; No TUR interrupts */
		\| SSCR0_RIM /* RIM = 1; No ROR interrupts */
		\| SSCR0_SSE /* SSE = 1; SSP enabled */
		\| SSCR0_Motorola /* FRF = 0; Motorola SPI */
		\| SSCR0_DataSize(16) /* DSS = 15; Data size = 16-bit */
		;
		static const u32 sscr1 = 0
		\| SSCR1_SCFR /* SCFR = 1; SSPSCLK only during transfers */
		\| SSCR1_SCLKDIR /* SCLKDIR = 1; Slave mode */
		\| SSCR1_SFRMDIR /* SFRMDIR = 1; Slave mode */
		\| SSCR1_RWOT /* RWOT = 1; Receive without transmit mode */
		\| SSCR1_RxTresh(1) /* RFT = 0; Receive FIFO threshold = 1 */
		\| SSCR1_SPH /* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */
		\| SSCR1_RIE /* RIE = 1; Receive FIFO interrupt enabled */
		;
		static const u32 sssr = 0
		\| SSSR_BCE /* BCE = 1; Clear BCE */
		\| SSSR_TUR /* TUR = 1; Clear TUR */
		\| SSSR_EOC /* EOC = 1; Clear EOC */
		\| SSSR_TINT /* TINT = 1; Clear TINT */
		\| SSSR_PINT /* PINT = 1; Clear PINT */
		\| SSSR_ROR /* ROR = 1; Clear ROR */
		;

		/*
		* MEP Query $22: Touchpad Coordinate Range Query is not supported by
		* the NavPoint module, so sampled values provide the default limits.
		*/
		#define NAVPOINT_X_MIN 1278
		#define NAVPOINT_X_MAX 5340
		#define NAVPOINT_Y_MIN 1572
		#define NAVPOINT_Y_MAX 4396
		#define NAVPOINT_PRESSURE_MIN 0
		#define NAVPOINT_PRESSURE_MAX 255

		static void navpoint_packet(struct navpoint *navpoint)
		{
		int finger;
		int gesture;
		int x, y, z;

		switch (navpoint->data[0]) {
		case 0xff: /* Garbage (packet?) between reset and Hello packet */
		case 0x00: /* Module 0, NULL packet */
		break;

		case 0x0e: /* Module 0, Absolute packet */
		finger = (navpoint->data[1] & 0x01);
		gesture = (navpoint->data[1] & 0x02);
		x = ((navpoint->data[2] & 0x1f) << 8) \| navpoint->data[3];
		y = ((navpoint->data[4] & 0x1f) << 8) \| navpoint->data[5];
		z = navpoint->data[6];
		input_report_key(navpoint->input, BTN_TOUCH, finger);
		input_report_abs(navpoint->input, ABS_X, x);
		input_report_abs(navpoint->input, ABS_Y, y);
		input_report_abs(navpoint->input, ABS_PRESSURE, z);
		input_report_key(navpoint->input, BTN_TOOL_FINGER, finger);
		input_report_key(navpoint->input, BTN_LEFT, gesture);
		input_sync(navpoint->input);
		break;

		case 0x19: /* Module 0, Hello packet */
		if ((navpoint->data[1] & 0xf0) == 0x10)
		break;
		/* FALLTHROUGH */
		default:
		dev_warn(navpoint->dev,
		"spurious packet: data=0x%02x,0x%02x,...\n",
		navpoint->data[0], navpoint->data[1]);
		break;
		}
		}

		static irqreturn_t navpoint_irq(int irq, void *dev_id)
		{
		struct navpoint *navpoint = dev_id;
		struct ssp_device *ssp = navpoint->ssp;
		irqreturn_t ret = IRQ_NONE;
		u32 status;

		status = pxa_ssp_read_reg(ssp, SSSR);
		if (status & sssr) {
		dev_warn(navpoint->dev,
		"unexpected interrupt: status=0x%08x\n", status);
		pxa_ssp_write_reg(ssp, SSSR, (status & sssr));
		ret = IRQ_HANDLED;
		}

		while (status & SSSR_RNE) {
		u32 data;

		data = pxa_ssp_read_reg(ssp, SSDR);
		navpoint->data[navpoint->index + 0] = (data >> 8);
		navpoint->data[navpoint->index + 1] = data;
		navpoint->index += 2;
		if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) {
		navpoint_packet(navpoint);
		navpoint->index = 0;
		}
		status = pxa_ssp_read_reg(ssp, SSSR);
		ret = IRQ_HANDLED;
		}

		return ret;
		}

		static void navpoint_up(struct navpoint *navpoint)
		{
		struct ssp_device *ssp = navpoint->ssp;
		int timeout;

		clk_prepare_enable(ssp->clk);

		pxa_ssp_write_reg(ssp, SSCR1, sscr1);
		pxa_ssp_write_reg(ssp, SSSR, sssr);
		pxa_ssp_write_reg(ssp, SSTO, 0);
		pxa_ssp_write_reg(ssp, SSCR0, sscr0); /* SSCR0_SSE written last */

		/* Wait until SSP port is ready for slave clock operations */
		for (timeout = 100; timeout != 0; --timeout) {
		if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS))
		break;
		msleep(1);
		}

		if (timeout == 0)
		dev_err(navpoint->dev,
		"timeout waiting for SSSR[CSS] to clear\n");

		if (gpio_is_valid(navpoint->gpio))
		gpio_set_value(navpoint->gpio, 1);
		}

		static void navpoint_down(struct navpoint *navpoint)
		{
		struct ssp_device *ssp = navpoint->ssp;

		if (gpio_is_valid(navpoint->gpio))
		gpio_set_value(navpoint->gpio, 0);

		pxa_ssp_write_reg(ssp, SSCR0, 0);

		clk_disable_unprepare(ssp->clk);
		}

		static int navpoint_open(struct input_dev *input)
		{
		struct navpoint *navpoint = input_get_drvdata(input);

		navpoint_up(navpoint);

		return 0;
		}

		static void navpoint_close(struct input_dev *input)
		{
		struct navpoint *navpoint = input_get_drvdata(input);

		navpoint_down(navpoint);
		}

		static int __devinit navpoint_probe(struct platform_device *pdev)
		{
		const struct navpoint_platform_data *pdata =
		dev_get_platdata(&pdev->dev);
		struct ssp_device *ssp;
		struct input_dev *input;
		struct navpoint *navpoint;
		int error;

		if (!pdata) {
		dev_err(&pdev->dev, "no platform data\n");
		return -EINVAL;
		}

		if (gpio_is_valid(pdata->gpio)) {
		error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW,
		"SYNAPTICS_ON");
		if (error)
		return error;
		}

		ssp = pxa_ssp_request(pdata->port, pdev->name);
		if (!ssp) {
		error = -ENODEV;
		goto err_free_gpio;
		}

		/* HaRET does not disable devices before jumping into Linux */
		if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
		pxa_ssp_write_reg(ssp, SSCR0, 0);
		dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port);
		}

		navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL);
		input = input_allocate_device();
		if (!navpoint \|\| !input) {
		error = -ENOMEM;
		goto err_free_mem;
		}

		navpoint->ssp = ssp;
		navpoint->input = input;
		navpoint->dev = &pdev->dev;
		navpoint->gpio = pdata->gpio;

		input->name = pdev->name;
		input->dev.parent = &pdev->dev;

		__set_bit(EV_KEY, input->evbit);
		__set_bit(EV_ABS, input->evbit);
		__set_bit(BTN_LEFT, input->keybit);
		__set_bit(BTN_TOUCH, input->keybit);
		__set_bit(BTN_TOOL_FINGER, input->keybit);

		input_set_abs_params(input, ABS_X,
		NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0);
		input_set_abs_params(input, ABS_Y,
		NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0);
		input_set_abs_params(input, ABS_PRESSURE,
		NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX,
		0, 0);

		input->open = navpoint_open;
		input->close = navpoint_close;

		input_set_drvdata(input, navpoint);

		error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint);
		if (error)
		goto err_free_mem;

		error = input_register_device(input);
		if (error)
		goto err_free_irq;

		platform_set_drvdata(pdev, navpoint);
		dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq);

		return 0;

		err_free_irq:
		free_irq(ssp->irq, &pdev->dev);
		err_free_mem:
		input_free_device(input);
		kfree(navpoint);
		pxa_ssp_free(ssp);
		err_free_gpio:
		if (gpio_is_valid(pdata->gpio))
		gpio_free(pdata->gpio);

		return error;
		}

		static int __devexit navpoint_remove(struct platform_device *pdev)
		{
		const struct navpoint_platform_data *pdata =
		dev_get_platdata(&pdev->dev);
		struct navpoint *navpoint = platform_get_drvdata(pdev);
		struct ssp_device *ssp = navpoint->ssp;

		free_irq(ssp->irq, navpoint);

		input_unregister_device(navpoint->input);
		kfree(navpoint);

		pxa_ssp_free(ssp);

		if (gpio_is_valid(pdata->gpio))
		gpio_free(pdata->gpio);

		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static int navpoint_suspend(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct navpoint *navpoint = platform_get_drvdata(pdev);
		struct input_dev *input = navpoint->input;

		mutex_lock(&input->mutex);
		if (input->users)
		navpoint_down(navpoint);
		mutex_unlock(&input->mutex);

		return 0;
		}

		static int navpoint_resume(struct device *dev)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct navpoint *navpoint = platform_get_drvdata(pdev);
		struct input_dev *input = navpoint->input;

		mutex_lock(&input->mutex);
		if (input->users)
		navpoint_up(navpoint);
		mutex_unlock(&input->mutex);

		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume);

		static struct platform_driver navpoint_driver = {
		.probe = navpoint_probe,
		.remove = __devexit_p(navpoint_remove),
		.driver = {
		.name = "navpoint",
		.owner = THIS_MODULE,
		.pm = &navpoint_pm_ops,
		},
		};

		module_platform_driver(navpoint_driver);

		MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
		MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:navpoint");

include/linux/input/navpoint.h

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		/*
		* Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
		*
		* 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.
		*/

		struct navpoint_platform_data {
		int port; /* PXA SSP port for pxa_ssp_request() */
		int gpio; /* GPIO for power on/off */
		};