+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Synaptics NavPoint (PXA27x SSP/SPI) driver.
- *
- * Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/gpio/consumer.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;
- struct gpio_desc *gpiod;
- 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");
-
- gpiod_set_value(navpoint->gpiod, 1);
-}
-
-static void navpoint_down(struct navpoint *navpoint)
-{
- struct ssp_device *ssp = navpoint->ssp;
-
- gpiod_set_value(navpoint->gpiod, 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 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;
- }
-
- ssp = pxa_ssp_request(pdata->port, pdev->name);
- if (!ssp)
- return -ENODEV;
-
- /* 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->gpiod = gpiod_get_optional(&pdev->dev,
- NULL, GPIOD_OUT_LOW);
- if (IS_ERR(navpoint->gpiod)) {
- error = PTR_ERR(navpoint->gpiod);
- dev_err(&pdev->dev, "error getting GPIO\n");
- goto err_free_mem;
- }
- gpiod_set_consumer_name(navpoint->gpiod, "SYNAPTICS_ON");
-
- navpoint->ssp = ssp;
- navpoint->input = input;
- navpoint->dev = &pdev->dev;
-
- 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, navpoint);
-err_free_mem:
- input_free_device(input);
- kfree(navpoint);
- pxa_ssp_free(ssp);
-
- return error;
-}
-
-static void navpoint_remove(struct platform_device *pdev)
-{
- 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);
-}
-
-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_device_enabled(input))
- 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_device_enabled(input))
- navpoint_up(navpoint);
- mutex_unlock(&input->mutex);
-
- return 0;
-}
-
-static DEFINE_SIMPLE_DEV_PM_OPS(navpoint_pm_ops,
- navpoint_suspend, navpoint_resume);
-
-static struct platform_driver navpoint_driver = {
- .probe = navpoint_probe,
- .remove_new = navpoint_remove,
- .driver = {
- .name = "navpoint",
- .pm = pm_sleep_ptr(&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");
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