Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-25 13:41:51 +00:00
Code Issues Packages Projects Releases Wiki Activity
ca0d9997f5
linux/drivers/input/touchscreen/mainstone-wm97xx.c
Arnd Bergmann d6df7df7ae ARM: pxa: remove unused board files 
The majority of all pxa board files has not been touched in a long time,
and no users have spoken up in favor of keeping them around. This leaves
only support for the platforms that were already converted to DT, as
well as the gumstix and spitz/akita/borzoi machines that work in qemu
and can still be converted to DT later.

Cc: Ales Bardorfer <ales@i-tech.si>
Cc: Ales Snuparek <snuparek@atlas.cz>
Cc: Alex Osborne <ato@meshy.org>
Cc: Alex Osborne <bobofdoom@gmail.com>
Cc: Dirk Opfer <dirk@opfer-online.de>
Cc: Ian Molton <spyro@f2s.com>
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Michael Petchkovsky <mkpetch@internode.on.net>
Cc: Nick Bane <nick@cecomputing.co.uk>
Cc: Paul Parsons <lost.distance@yahoo.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Sergey Lapin <slapin@ossfans.org>
Cc: Tomas Cech <sleep_walker@suse.cz>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2023-01-20 11:23:44 +01:00

277 lines
6.8 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
* Wolfson WM97xx AC97 Codecs.
*
* Copyright 2004, 2007 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
* Parts Copyright : Ian Molton <spyro@f2s.com>
* Andrew Zabolotny <zap@homelink.ru>
*
* Notes:
* This is a wm97xx extended touch driver to capture touch
* data in a continuous manner on the Intel XScale architecture
*
* Features:
* - codecs supported:- WM9705, WM9712, WM9713
* - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
*/
#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>
#include <asm/mach-types.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[] = {
{ WM9705_ID2, 0, WM_READS(94), 94 },
{ WM9705_ID2, 1, WM_READS(188), 188 },
{ WM9705_ID2, 2, WM_READS(375), 375 },
{ WM9705_ID2, 3, WM_READS(750), 750 },
{ WM9712_ID2, 0, WM_READS(94), 94 },
{ WM9712_ID2, 1, WM_READS(188), 188 },
{ WM9712_ID2, 2, WM_READS(375), 375 },
{ WM9712_ID2, 3, WM_READS(750), 750 },
{ 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;
static struct gpio_desc *gpiod_irq;
/*
* 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)");
/*
* Pen down detection.
*
* This driver can either poll or use an interrupt to indicate a pen down
* event. If the irq request fails then it will fall back to polling mode.
*/
static int pen_int;
module_param(pen_int, int, 0);
MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
/*
* 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 on pxa machines */
static void wm97xx_acc_pen_up(struct wm97xx *wm)
{
unsigned int count;
msleep(1);
if (cpu_is_pxa27x()) {
while (pxa2xx_ac97_read_misr() & (1 << 2))
pxa2xx_ac97_read_modr();
} else if (cpu_is_pxa3xx()) {
for (count = 0; count < 16; count++)
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 = 0, ret = 0;
/* 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,
"mainstone accelerated touchscreen driver, %d samples/sec\n",
cinfo[sp_idx].speed);
if (pen_int) {
gpiod_irq = gpiod_get(wm->dev, "touch", GPIOD_IN);
if (IS_ERR(gpiod_irq))
pen_int = 0;
}
if (pen_int) {
wm->pen_irq = gpiod_to_irq(gpiod_irq);
irq_set_irq_type(wm->pen_irq, IRQ_TYPE_EDGE_BOTH);
}
/* codec specific irq config */
if (pen_int) {
switch (wm->id) {
case WM9705_ID2:
break;
case WM9712_ID2:
case WM9713_ID2:
/* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
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);
break;
default:
dev_err(wm->dev,
"pen down irq not supported on this device\n");
pen_int = 0;
break;
}
}
return ret;
}
static void wm97xx_acc_shutdown(struct wm97xx *wm)
{
/* codec specific deconfig */
if (pen_int) {
if (gpiod_irq)
gpiod_put(gpiod_irq);
wm->pen_irq = 0;
}
}
static struct wm97xx_mach_ops mainstone_mach_ops = {
.acc_enabled = 1,
.acc_pen_up = wm97xx_acc_pen_up,
.acc_pen_down = wm97xx_acc_pen_down,
.acc_startup = wm97xx_acc_startup,
.acc_shutdown = wm97xx_acc_shutdown,
.irq_gpio = WM97XX_GPIO_2,
};
static int mainstone_wm97xx_probe(struct platform_device *pdev)
{
struct wm97xx *wm = platform_get_drvdata(pdev);
return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
}
static int mainstone_wm97xx_remove(struct platform_device *pdev)
{
struct wm97xx *wm = platform_get_drvdata(pdev);
wm97xx_unregister_mach_ops(wm);
return 0;
}
static struct platform_driver mainstone_wm97xx_driver = {
.probe = mainstone_wm97xx_probe,
.remove = mainstone_wm97xx_remove,
.driver = {
.name = "wm97xx-touch",
},
};
module_platform_driver(mainstone_wm97xx_driver);
/* Module information */
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink