+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver
- *
- * Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC.
- * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
- * Parts Copyright : Ian Molton <spyro@f2s.com>
- * Andrew Zabolotny <zap@homelink.ru>
- *
- * Notes:
- * This is a wm97xx extended touch driver supporting interrupt driven
- * and continuous operation on Marvell Zylonite development systems
- * (which have a WM9713 on board).
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
-#include <linux/irq.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/soc/pxa/cpu.h>
-#include <linux/wm97xx.h>
-
-#include <sound/pxa2xx-lib.h>
-
-struct continuous {
- u16 id; /* codec id */
- u8 code; /* continuous code */
- u8 reads; /* number of coord reads per read cycle */
- u32 speed; /* number of coords per second */
-};
-
-#define WM_READS(sp) ((sp / HZ) + 1)
-
-static const struct continuous cinfo[] = {
- { WM9713_ID2, 0, WM_READS(94), 94 },
- { WM9713_ID2, 1, WM_READS(120), 120 },
- { WM9713_ID2, 2, WM_READS(154), 154 },
- { WM9713_ID2, 3, WM_READS(188), 188 },
-};
-
-/* continuous speed index */
-static int sp_idx;
-
-/*
- * Pen sampling frequency (Hz) in continuous mode.
- */
-static int cont_rate = 200;
-module_param(cont_rate, int, 0);
-MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
-
-/*
- * Pressure readback.
- *
- * Set to 1 to read back pen down pressure
- */
-static int pressure;
-module_param(pressure, int, 0);
-MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
-
-/*
- * AC97 touch data slot.
- *
- * Touch screen readback data ac97 slot
- */
-static int ac97_touch_slot = 5;
-module_param(ac97_touch_slot, int, 0);
-MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
-
-
-/* flush AC97 slot 5 FIFO machines */
-static void wm97xx_acc_pen_up(struct wm97xx *wm)
-{
- int i;
-
- msleep(1);
-
- for (i = 0; i < 16; i++)
- pxa2xx_ac97_read_modr();
-}
-
-static int wm97xx_acc_pen_down(struct wm97xx *wm)
-{
- u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
- int reads = 0;
- static u16 last, tries;
-
- /* When the AC97 queue has been drained we need to allow time
- * to buffer up samples otherwise we end up spinning polling
- * for samples. The controller can't have a suitably low
- * threshold set to use the notifications it gives.
- */
- msleep(1);
-
- if (tries > 5) {
- tries = 0;
- return RC_PENUP;
- }
-
- x = pxa2xx_ac97_read_modr();
- if (x == last) {
- tries++;
- return RC_AGAIN;
- }
- last = x;
- do {
- if (reads)
- x = pxa2xx_ac97_read_modr();
- y = pxa2xx_ac97_read_modr();
- if (pressure)
- p = pxa2xx_ac97_read_modr();
-
- dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
- x, y, p);
-
- /* are samples valid */
- if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X ||
- (y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y ||
- (p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES)
- goto up;
-
- /* coordinate is good */
- tries = 0;
- input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
- input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
- input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
- input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
- input_sync(wm->input_dev);
- reads++;
- } while (reads < cinfo[sp_idx].reads);
-up:
- return RC_PENDOWN | RC_AGAIN;
-}
-
-static int wm97xx_acc_startup(struct wm97xx *wm)
-{
- int idx;
-
- /* check we have a codec */
- if (wm->ac97 == NULL)
- return -ENODEV;
-
- /* Go you big red fire engine */
- for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
- if (wm->id != cinfo[idx].id)
- continue;
- sp_idx = idx;
- if (cont_rate <= cinfo[idx].speed)
- break;
- }
- wm->acc_rate = cinfo[sp_idx].code;
- wm->acc_slot = ac97_touch_slot;
- dev_info(wm->dev,
- "zylonite accelerated touchscreen driver, %d samples/sec\n",
- cinfo[sp_idx].speed);
-
- return 0;
-}
-
-static struct wm97xx_mach_ops zylonite_mach_ops = {
- .acc_enabled = 1,
- .acc_pen_up = wm97xx_acc_pen_up,
- .acc_pen_down = wm97xx_acc_pen_down,
- .acc_startup = wm97xx_acc_startup,
- .irq_gpio = WM97XX_GPIO_2,
-};
-
-static int zylonite_wm97xx_probe(struct platform_device *pdev)
-{
- struct wm97xx *wm = platform_get_drvdata(pdev);
- struct gpio_desc *gpio_touch_irq;
- int err;
-
- gpio_touch_irq = devm_gpiod_get(&pdev->dev, "touch", GPIOD_IN);
- err = PTR_ERR_OR_ZERO(gpio_touch_irq);
- if (err) {
- dev_err(&pdev->dev, "Cannot get irq gpio: %d\n", err);
- return err;
- }
-
- wm->pen_irq = gpiod_to_irq(gpio_touch_irq);
- irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
-
- wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
- WM97XX_GPIO_POL_HIGH,
- WM97XX_GPIO_STICKY,
- WM97XX_GPIO_WAKE);
- wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
- WM97XX_GPIO_POL_HIGH,
- WM97XX_GPIO_NOTSTICKY,
- WM97XX_GPIO_NOWAKE);
-
- return wm97xx_register_mach_ops(wm, &zylonite_mach_ops);
-}
-
-static int zylonite_wm97xx_remove(struct platform_device *pdev)
-{
- struct wm97xx *wm = platform_get_drvdata(pdev);
-
- wm97xx_unregister_mach_ops(wm);
-
- return 0;
-}
-
-static struct platform_driver zylonite_wm97xx_driver = {
- .probe = zylonite_wm97xx_probe,
- .remove = zylonite_wm97xx_remove,
- .driver = {
- .name = "wm97xx-touch",
- },
-};
-module_platform_driver(zylonite_wm97xx_driver);
-
-/* Module information */
-MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
-MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite");
-MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff