Input: Add Synaptics NavPoint (PXA27x SSP/SPI) driver
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. Signed-off-by: Paul Parsons <lost.distance@yahoo.com> Tested-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Paul Parsons
Dmitry Torokhov
parent
6ee3dbf93a
commit
ae99ea562b
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@ -339,4 +339,16 @@ config MOUSE_SYNAPTICS_USB
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To compile this driver as a module, choose M here: the
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module will be called synaptics_usb.
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config MOUSE_NAVPOINT_PXA27x
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tristate "Synaptics NavPoint (PXA27x SSP/SPI)"
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depends on PXA27x && PXA_SSP
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help
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This driver adds support for the Synaptics NavPoint touchpad connected
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to a PXA27x SSP port in SPI slave mode. The device emulates a mouse;
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a tap or tap-and-a-half drag gesture emulates the left mouse button.
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For example, use the xf86-input-evdev driver for an X pointing device.
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To compile this driver as a module, choose M here: the
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module will be called navpoint.
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endif
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@ -12,6 +12,7 @@ obj-$(CONFIG_MOUSE_GPIO) += gpio_mouse.o
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obj-$(CONFIG_MOUSE_INPORT) += inport.o
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obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
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obj-$(CONFIG_MOUSE_MAPLE) += maplemouse.o
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obj-$(CONFIG_MOUSE_NAVPOINT_PXA27x) += navpoint.o
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obj-$(CONFIG_MOUSE_PC110PAD) += pc110pad.o
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obj-$(CONFIG_MOUSE_PS2) += psmouse.o
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obj-$(CONFIG_MOUSE_PXA930_TRKBALL) += pxa930_trkball.o
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@ -0,0 +1,369 @@
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/*
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* Synaptics NavPoint (PXA27x SSP/SPI) driver.
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*
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* Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/input.h>
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#include <linux/input/navpoint.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/pxa2xx_ssp.h>
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#include <linux/slab.h>
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/*
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* Synaptics Modular Embedded Protocol: Module Packet Format.
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* Module header byte 2:0 = Length (# bytes that follow)
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* Module header byte 4:3 = Control
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* Module header byte 7:5 = Module Address
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*/
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#define HEADER_LENGTH(byte) ((byte) & 0x07)
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#define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03)
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#define HEADER_ADDRESS(byte) ((byte) >> 5)
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struct navpoint {
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struct ssp_device *ssp;
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struct input_dev *input;
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struct device *dev;
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int gpio;
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int index;
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u8 data[1 + HEADER_LENGTH(0xff)];
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};
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/*
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* Initialization values for SSCR0_x, SSCR1_x, SSSR_x.
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*/
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static const u32 sscr0 = 0
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| SSCR0_TUM /* TIM = 1; No TUR interrupts */
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| SSCR0_RIM /* RIM = 1; No ROR interrupts */
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| SSCR0_SSE /* SSE = 1; SSP enabled */
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| SSCR0_Motorola /* FRF = 0; Motorola SPI */
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| SSCR0_DataSize(16) /* DSS = 15; Data size = 16-bit */
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;
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static const u32 sscr1 = 0
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| SSCR1_SCFR /* SCFR = 1; SSPSCLK only during transfers */
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| SSCR1_SCLKDIR /* SCLKDIR = 1; Slave mode */
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| SSCR1_SFRMDIR /* SFRMDIR = 1; Slave mode */
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| SSCR1_RWOT /* RWOT = 1; Receive without transmit mode */
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| SSCR1_RxTresh(1) /* RFT = 0; Receive FIFO threshold = 1 */
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| SSCR1_SPH /* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */
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| SSCR1_RIE /* RIE = 1; Receive FIFO interrupt enabled */
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;
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static const u32 sssr = 0
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| SSSR_BCE /* BCE = 1; Clear BCE */
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| SSSR_TUR /* TUR = 1; Clear TUR */
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| SSSR_EOC /* EOC = 1; Clear EOC */
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| SSSR_TINT /* TINT = 1; Clear TINT */
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| SSSR_PINT /* PINT = 1; Clear PINT */
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| SSSR_ROR /* ROR = 1; Clear ROR */
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;
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/*
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* MEP Query $22: Touchpad Coordinate Range Query is not supported by
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* the NavPoint module, so sampled values provide the default limits.
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*/
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#define NAVPOINT_X_MIN 1278
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#define NAVPOINT_X_MAX 5340
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#define NAVPOINT_Y_MIN 1572
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#define NAVPOINT_Y_MAX 4396
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#define NAVPOINT_PRESSURE_MIN 0
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#define NAVPOINT_PRESSURE_MAX 255
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static void navpoint_packet(struct navpoint *navpoint)
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{
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int finger;
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int gesture;
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int x, y, z;
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switch (navpoint->data[0]) {
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case 0xff: /* Garbage (packet?) between reset and Hello packet */
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case 0x00: /* Module 0, NULL packet */
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break;
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case 0x0e: /* Module 0, Absolute packet */
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finger = (navpoint->data[1] & 0x01);
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gesture = (navpoint->data[1] & 0x02);
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x = ((navpoint->data[2] & 0x1f) << 8) | navpoint->data[3];
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y = ((navpoint->data[4] & 0x1f) << 8) | navpoint->data[5];
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z = navpoint->data[6];
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input_report_key(navpoint->input, BTN_TOUCH, finger);
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input_report_abs(navpoint->input, ABS_X, x);
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input_report_abs(navpoint->input, ABS_Y, y);
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input_report_abs(navpoint->input, ABS_PRESSURE, z);
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input_report_key(navpoint->input, BTN_TOOL_FINGER, finger);
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input_report_key(navpoint->input, BTN_LEFT, gesture);
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input_sync(navpoint->input);
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break;
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case 0x19: /* Module 0, Hello packet */
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if ((navpoint->data[1] & 0xf0) == 0x10)
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break;
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/* FALLTHROUGH */
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default:
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dev_warn(navpoint->dev,
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"spurious packet: data=0x%02x,0x%02x,...\n",
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navpoint->data[0], navpoint->data[1]);
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break;
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}
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}
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static irqreturn_t navpoint_irq(int irq, void *dev_id)
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{
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struct navpoint *navpoint = dev_id;
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struct ssp_device *ssp = navpoint->ssp;
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irqreturn_t ret = IRQ_NONE;
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u32 status;
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status = pxa_ssp_read_reg(ssp, SSSR);
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if (status & sssr) {
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dev_warn(navpoint->dev,
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"unexpected interrupt: status=0x%08x\n", status);
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pxa_ssp_write_reg(ssp, SSSR, (status & sssr));
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ret = IRQ_HANDLED;
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}
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while (status & SSSR_RNE) {
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u32 data;
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data = pxa_ssp_read_reg(ssp, SSDR);
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navpoint->data[navpoint->index + 0] = (data >> 8);
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navpoint->data[navpoint->index + 1] = data;
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navpoint->index += 2;
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if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) {
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navpoint_packet(navpoint);
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navpoint->index = 0;
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}
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status = pxa_ssp_read_reg(ssp, SSSR);
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ret = IRQ_HANDLED;
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}
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return ret;
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}
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static void navpoint_up(struct navpoint *navpoint)
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{
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struct ssp_device *ssp = navpoint->ssp;
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int timeout;
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clk_prepare_enable(ssp->clk);
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pxa_ssp_write_reg(ssp, SSCR1, sscr1);
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pxa_ssp_write_reg(ssp, SSSR, sssr);
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pxa_ssp_write_reg(ssp, SSTO, 0);
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pxa_ssp_write_reg(ssp, SSCR0, sscr0); /* SSCR0_SSE written last */
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/* Wait until SSP port is ready for slave clock operations */
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for (timeout = 100; timeout != 0; --timeout) {
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if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS))
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break;
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msleep(1);
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}
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if (timeout == 0)
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dev_err(navpoint->dev,
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"timeout waiting for SSSR[CSS] to clear\n");
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if (gpio_is_valid(navpoint->gpio))
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gpio_set_value(navpoint->gpio, 1);
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}
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static void navpoint_down(struct navpoint *navpoint)
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{
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struct ssp_device *ssp = navpoint->ssp;
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if (gpio_is_valid(navpoint->gpio))
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gpio_set_value(navpoint->gpio, 0);
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pxa_ssp_write_reg(ssp, SSCR0, 0);
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clk_disable_unprepare(ssp->clk);
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}
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static int navpoint_open(struct input_dev *input)
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{
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struct navpoint *navpoint = input_get_drvdata(input);
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navpoint_up(navpoint);
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return 0;
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}
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static void navpoint_close(struct input_dev *input)
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{
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struct navpoint *navpoint = input_get_drvdata(input);
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navpoint_down(navpoint);
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}
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static int __devinit navpoint_probe(struct platform_device *pdev)
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{
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const struct navpoint_platform_data *pdata =
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dev_get_platdata(&pdev->dev);
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struct ssp_device *ssp;
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struct input_dev *input;
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struct navpoint *navpoint;
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int error;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data\n");
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return -EINVAL;
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}
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if (gpio_is_valid(pdata->gpio)) {
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error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW,
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"SYNAPTICS_ON");
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if (error)
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return error;
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}
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ssp = pxa_ssp_request(pdata->port, pdev->name);
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if (!ssp) {
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error = -ENODEV;
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goto err_free_gpio;
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}
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/* HaRET does not disable devices before jumping into Linux */
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if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
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pxa_ssp_write_reg(ssp, SSCR0, 0);
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dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port);
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}
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navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL);
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input = input_allocate_device();
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if (!navpoint || !input) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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navpoint->ssp = ssp;
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navpoint->input = input;
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navpoint->dev = &pdev->dev;
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navpoint->gpio = pdata->gpio;
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input->name = pdev->name;
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input->dev.parent = &pdev->dev;
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__set_bit(EV_KEY, input->evbit);
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__set_bit(EV_ABS, input->evbit);
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__set_bit(BTN_LEFT, input->keybit);
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__set_bit(BTN_TOUCH, input->keybit);
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__set_bit(BTN_TOOL_FINGER, input->keybit);
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input_set_abs_params(input, ABS_X,
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NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0);
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input_set_abs_params(input, ABS_Y,
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NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0);
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input_set_abs_params(input, ABS_PRESSURE,
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NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX,
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0, 0);
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input->open = navpoint_open;
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input->close = navpoint_close;
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input_set_drvdata(input, navpoint);
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error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint);
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if (error)
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goto err_free_mem;
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error = input_register_device(input);
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if (error)
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goto err_free_irq;
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platform_set_drvdata(pdev, navpoint);
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dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq);
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return 0;
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err_free_irq:
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free_irq(ssp->irq, &pdev->dev);
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err_free_mem:
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input_free_device(input);
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kfree(navpoint);
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pxa_ssp_free(ssp);
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err_free_gpio:
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if (gpio_is_valid(pdata->gpio))
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gpio_free(pdata->gpio);
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return error;
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}
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static int __devexit navpoint_remove(struct platform_device *pdev)
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{
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const struct navpoint_platform_data *pdata =
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dev_get_platdata(&pdev->dev);
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struct navpoint *navpoint = platform_get_drvdata(pdev);
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struct ssp_device *ssp = navpoint->ssp;
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free_irq(ssp->irq, navpoint);
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input_unregister_device(navpoint->input);
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kfree(navpoint);
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pxa_ssp_free(ssp);
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if (gpio_is_valid(pdata->gpio))
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gpio_free(pdata->gpio);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int navpoint_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct navpoint *navpoint = platform_get_drvdata(pdev);
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struct input_dev *input = navpoint->input;
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mutex_lock(&input->mutex);
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if (input->users)
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navpoint_down(navpoint);
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mutex_unlock(&input->mutex);
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return 0;
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}
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static int navpoint_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct navpoint *navpoint = platform_get_drvdata(pdev);
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struct input_dev *input = navpoint->input;
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mutex_lock(&input->mutex);
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if (input->users)
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navpoint_up(navpoint);
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mutex_unlock(&input->mutex);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume);
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static struct platform_driver navpoint_driver = {
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.probe = navpoint_probe,
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.remove = __devexit_p(navpoint_remove),
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.driver = {
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.name = "navpoint",
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.owner = THIS_MODULE,
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.pm = &navpoint_pm_ops,
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},
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};
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module_platform_driver(navpoint_driver);
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MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
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MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:navpoint");
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@ -0,0 +1,12 @@
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/*
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* Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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struct navpoint_platform_data {
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int port; /* PXA SSP port for pxa_ssp_request() */
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int gpio; /* GPIO for power on/off */
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};
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