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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
228 lines
5.4 KiB
C
228 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* zylonite-wm97xx.c -- Zylonite Continuous Touch screen driver
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*
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* Copyright 2004, 2007, 2008 Wolfson Microelectronics PLC.
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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* Parts Copyright : Ian Molton <spyro@f2s.com>
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* Andrew Zabolotny <zap@homelink.ru>
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*
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* Notes:
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* This is a wm97xx extended touch driver supporting interrupt driven
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* and continuous operation on Marvell Zylonite development systems
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* (which have a WM9713 on board).
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/wm97xx.h>
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#include <mach/hardware.h>
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#include <mach/mfp.h>
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#include <mach/regs-ac97.h>
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struct continuous {
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u16 id; /* codec id */
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u8 code; /* continuous code */
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u8 reads; /* number of coord reads per read cycle */
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u32 speed; /* number of coords per second */
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};
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#define WM_READS(sp) ((sp / HZ) + 1)
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static const struct continuous cinfo[] = {
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{ WM9713_ID2, 0, WM_READS(94), 94 },
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{ WM9713_ID2, 1, WM_READS(120), 120 },
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{ WM9713_ID2, 2, WM_READS(154), 154 },
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{ WM9713_ID2, 3, WM_READS(188), 188 },
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};
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/* continuous speed index */
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static int sp_idx;
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/*
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* Pen sampling frequency (Hz) in continuous mode.
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*/
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static int cont_rate = 200;
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module_param(cont_rate, int, 0);
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MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
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/*
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* Pressure readback.
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*
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* Set to 1 to read back pen down pressure
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*/
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static int pressure;
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module_param(pressure, int, 0);
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MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
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/*
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* AC97 touch data slot.
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*
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* Touch screen readback data ac97 slot
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*/
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static int ac97_touch_slot = 5;
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module_param(ac97_touch_slot, int, 0);
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MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
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/* flush AC97 slot 5 FIFO machines */
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static void wm97xx_acc_pen_up(struct wm97xx *wm)
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{
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int i;
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msleep(1);
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for (i = 0; i < 16; i++)
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MODR;
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}
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static int wm97xx_acc_pen_down(struct wm97xx *wm)
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{
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u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
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int reads = 0;
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static u16 last, tries;
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/* When the AC97 queue has been drained we need to allow time
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* to buffer up samples otherwise we end up spinning polling
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* for samples. The controller can't have a suitably low
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* threshold set to use the notifications it gives.
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*/
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msleep(1);
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if (tries > 5) {
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tries = 0;
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return RC_PENUP;
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}
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x = MODR;
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if (x == last) {
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tries++;
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return RC_AGAIN;
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}
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last = x;
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do {
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if (reads)
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x = MODR;
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y = MODR;
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if (pressure)
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p = MODR;
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dev_dbg(wm->dev, "Raw coordinates: x=%x, y=%x, p=%x\n",
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x, y, p);
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/* are samples valid */
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if ((x & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_X ||
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(y & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_Y ||
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(p & WM97XX_ADCSEL_MASK) != WM97XX_ADCSEL_PRES)
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goto up;
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/* coordinate is good */
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tries = 0;
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input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
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input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
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input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
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input_report_key(wm->input_dev, BTN_TOUCH, (p != 0));
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input_sync(wm->input_dev);
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reads++;
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} while (reads < cinfo[sp_idx].reads);
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up:
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return RC_PENDOWN | RC_AGAIN;
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}
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static int wm97xx_acc_startup(struct wm97xx *wm)
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{
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int idx;
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/* check we have a codec */
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if (wm->ac97 == NULL)
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return -ENODEV;
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/* Go you big red fire engine */
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for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
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if (wm->id != cinfo[idx].id)
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continue;
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sp_idx = idx;
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if (cont_rate <= cinfo[idx].speed)
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break;
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}
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wm->acc_rate = cinfo[sp_idx].code;
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wm->acc_slot = ac97_touch_slot;
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dev_info(wm->dev,
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"zylonite accelerated touchscreen driver, %d samples/sec\n",
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cinfo[sp_idx].speed);
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return 0;
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}
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static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
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{
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if (enable)
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enable_irq(wm->pen_irq);
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else
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disable_irq_nosync(wm->pen_irq);
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}
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static struct wm97xx_mach_ops zylonite_mach_ops = {
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.acc_enabled = 1,
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.acc_pen_up = wm97xx_acc_pen_up,
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.acc_pen_down = wm97xx_acc_pen_down,
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.acc_startup = wm97xx_acc_startup,
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.irq_enable = wm97xx_irq_enable,
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.irq_gpio = WM97XX_GPIO_2,
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};
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static int zylonite_wm97xx_probe(struct platform_device *pdev)
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{
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struct wm97xx *wm = platform_get_drvdata(pdev);
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int gpio_touch_irq;
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if (cpu_is_pxa320())
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gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO15);
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else
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gpio_touch_irq = mfp_to_gpio(MFP_PIN_GPIO26);
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wm->pen_irq = gpio_to_irq(gpio_touch_irq);
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irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
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wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
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WM97XX_GPIO_POL_HIGH,
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WM97XX_GPIO_STICKY,
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WM97XX_GPIO_WAKE);
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wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
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WM97XX_GPIO_POL_HIGH,
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WM97XX_GPIO_NOTSTICKY,
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WM97XX_GPIO_NOWAKE);
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return wm97xx_register_mach_ops(wm, &zylonite_mach_ops);
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}
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static int zylonite_wm97xx_remove(struct platform_device *pdev)
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{
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struct wm97xx *wm = platform_get_drvdata(pdev);
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wm97xx_unregister_mach_ops(wm);
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return 0;
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}
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static struct platform_driver zylonite_wm97xx_driver = {
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.probe = zylonite_wm97xx_probe,
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.remove = zylonite_wm97xx_remove,
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.driver = {
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.name = "wm97xx-touch",
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},
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};
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module_platform_driver(zylonite_wm97xx_driver);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("wm97xx continuous touch driver for Zylonite");
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MODULE_LICENSE("GPL");
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