477 строки
12 KiB
C
477 строки
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* wm9713.c -- Codec touch driver for Wolfson WM9713 AC97 Codec.
|
|
*
|
|
* Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
|
|
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
|
|
* Parts Copyright : Ian Molton <spyro@f2s.com>
|
|
* Andrew Zabolotny <zap@homelink.ru>
|
|
* Russell King <rmk@arm.linux.org.uk>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/input.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/wm97xx.h>
|
|
|
|
#define TS_NAME "wm97xx"
|
|
#define WM9713_VERSION "1.00"
|
|
#define DEFAULT_PRESSURE 0xb0c0
|
|
|
|
/*
|
|
* Module parameters
|
|
*/
|
|
|
|
/*
|
|
* Set internal pull up for pen detect.
|
|
*
|
|
* Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
|
|
* i.e. pull up resistance = 64k Ohms / rpu.
|
|
*
|
|
* Adjust this value if you are having problems with pen detect not
|
|
* detecting any down event.
|
|
*/
|
|
static int rpu = 8;
|
|
module_param(rpu, int, 0);
|
|
MODULE_PARM_DESC(rpu, "Set internal pull up resistor for pen detect.");
|
|
|
|
/*
|
|
* Set current used for pressure measurement.
|
|
*
|
|
* Set pil = 2 to use 400uA
|
|
* pil = 1 to use 200uA and
|
|
* pil = 0 to disable pressure measurement.
|
|
*
|
|
* This is used to increase the range of values returned by the adc
|
|
* when measureing touchpanel pressure.
|
|
*/
|
|
static int pil;
|
|
module_param(pil, int, 0);
|
|
MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
|
|
|
|
/*
|
|
* Set threshold for pressure measurement.
|
|
*
|
|
* Pen down pressure below threshold is ignored.
|
|
*/
|
|
static int pressure = DEFAULT_PRESSURE & 0xfff;
|
|
module_param(pressure, int, 0);
|
|
MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
|
|
|
|
/*
|
|
* Set adc sample delay.
|
|
*
|
|
* For accurate touchpanel measurements, some settling time may be
|
|
* required between the switch matrix applying a voltage across the
|
|
* touchpanel plate and the ADC sampling the signal.
|
|
*
|
|
* This delay can be set by setting delay = n, where n is the array
|
|
* position of the delay in the array delay_table below.
|
|
* Long delays > 1ms are supported for completeness, but are not
|
|
* recommended.
|
|
*/
|
|
static int delay = 4;
|
|
module_param(delay, int, 0);
|
|
MODULE_PARM_DESC(delay, "Set adc sample delay.");
|
|
|
|
/*
|
|
* Set five_wire = 1 to use a 5 wire touchscreen.
|
|
*
|
|
* NOTE: Five wire mode does not allow for readback of pressure.
|
|
*/
|
|
static int five_wire;
|
|
module_param(five_wire, int, 0);
|
|
MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
|
|
|
|
/*
|
|
* Set adc mask function.
|
|
*
|
|
* Sources of glitch noise, such as signals driving an LCD display, may feed
|
|
* through to the touch screen plates and affect measurement accuracy. In
|
|
* order to minimise this, a signal may be applied to the MASK pin to delay or
|
|
* synchronise the sampling.
|
|
*
|
|
* 0 = No delay or sync
|
|
* 1 = High on pin stops conversions
|
|
* 2 = Edge triggered, edge on pin delays conversion by delay param (above)
|
|
* 3 = Edge triggered, edge on pin starts conversion after delay param
|
|
*/
|
|
static int mask;
|
|
module_param(mask, int, 0);
|
|
MODULE_PARM_DESC(mask, "Set adc mask function.");
|
|
|
|
/*
|
|
* Coordinate Polling Enable.
|
|
*
|
|
* Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
|
|
* for every poll.
|
|
*/
|
|
static int coord;
|
|
module_param(coord, int, 0);
|
|
MODULE_PARM_DESC(coord, "Polling coordinate mode");
|
|
|
|
/*
|
|
* ADC sample delay times in uS
|
|
*/
|
|
static const int delay_table[] = {
|
|
21, /* 1 AC97 Link frames */
|
|
42, /* 2 */
|
|
84, /* 4 */
|
|
167, /* 8 */
|
|
333, /* 16 */
|
|
667, /* 32 */
|
|
1000, /* 48 */
|
|
1333, /* 64 */
|
|
2000, /* 96 */
|
|
2667, /* 128 */
|
|
3333, /* 160 */
|
|
4000, /* 192 */
|
|
4667, /* 224 */
|
|
5333, /* 256 */
|
|
6000, /* 288 */
|
|
0 /* No delay, switch matrix always on */
|
|
};
|
|
|
|
/*
|
|
* Delay after issuing a POLL command.
|
|
*
|
|
* The delay is 3 AC97 link frames + the touchpanel settling delay
|
|
*/
|
|
static inline void poll_delay(int d)
|
|
{
|
|
udelay(3 * AC97_LINK_FRAME + delay_table[d]);
|
|
}
|
|
|
|
/*
|
|
* set up the physical settings of the WM9713
|
|
*/
|
|
static void wm9713_phy_init(struct wm97xx *wm)
|
|
{
|
|
u16 dig1 = 0, dig2, dig3;
|
|
|
|
/* default values */
|
|
dig2 = WM97XX_DELAY(4) | WM97XX_SLT(5);
|
|
dig3 = WM9712_RPU(1);
|
|
|
|
/* rpu */
|
|
if (rpu) {
|
|
dig3 &= 0xffc0;
|
|
dig3 |= WM9712_RPU(rpu);
|
|
dev_info(wm->dev, "setting pen detect pull-up to %d Ohms\n",
|
|
64000 / rpu);
|
|
}
|
|
|
|
/* Five wire panel? */
|
|
if (five_wire) {
|
|
dig3 |= WM9713_45W;
|
|
dev_info(wm->dev, "setting 5-wire touchscreen mode.");
|
|
|
|
if (pil) {
|
|
dev_warn(wm->dev,
|
|
"Pressure measurement not supported in 5 "
|
|
"wire mode, disabling\n");
|
|
pil = 0;
|
|
}
|
|
}
|
|
|
|
/* touchpanel pressure */
|
|
if (pil == 2) {
|
|
dig3 |= WM9712_PIL;
|
|
dev_info(wm->dev,
|
|
"setting pressure measurement current to 400uA.");
|
|
} else if (pil)
|
|
dev_info(wm->dev,
|
|
"setting pressure measurement current to 200uA.");
|
|
if (!pil)
|
|
pressure = 0;
|
|
|
|
/* sample settling delay */
|
|
if (delay < 0 || delay > 15) {
|
|
dev_info(wm->dev, "supplied delay out of range.");
|
|
delay = 4;
|
|
dev_info(wm->dev, "setting adc sample delay to %d u Secs.",
|
|
delay_table[delay]);
|
|
}
|
|
dig2 &= 0xff0f;
|
|
dig2 |= WM97XX_DELAY(delay);
|
|
|
|
/* mask */
|
|
dig3 |= ((mask & 0x3) << 4);
|
|
if (coord)
|
|
dig3 |= WM9713_WAIT;
|
|
|
|
wm->misc = wm97xx_reg_read(wm, 0x5a);
|
|
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
|
|
wm97xx_reg_write(wm, AC97_GPIO_STICKY, 0x0);
|
|
}
|
|
|
|
static void wm9713_dig_enable(struct wm97xx *wm, int enable)
|
|
{
|
|
u16 val;
|
|
|
|
if (enable) {
|
|
val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
|
|
wm97xx_reg_write(wm, AC97_EXTENDED_MID, val & 0x7fff);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] |
|
|
WM97XX_PRP_DET_DIG);
|
|
wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
|
|
} else {
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] &
|
|
~WM97XX_PRP_DET_DIG);
|
|
val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
|
|
wm97xx_reg_write(wm, AC97_EXTENDED_MID, val | 0x8000);
|
|
}
|
|
}
|
|
|
|
static void wm9713_dig_restore(struct wm97xx *wm)
|
|
{
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]);
|
|
}
|
|
|
|
static void wm9713_aux_prepare(struct wm97xx *wm)
|
|
{
|
|
memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1, 0);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG2, 0);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, WM97XX_PRP_DET_DIG);
|
|
}
|
|
|
|
static inline int is_pden(struct wm97xx *wm)
|
|
{
|
|
return wm->dig[2] & WM9713_PDEN;
|
|
}
|
|
|
|
/*
|
|
* Read a sample from the WM9713 adc in polling mode.
|
|
*/
|
|
static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
|
|
{
|
|
u16 dig1;
|
|
int timeout = 5 * delay;
|
|
bool wants_pen = adcsel & WM97XX_PEN_DOWN;
|
|
|
|
if (wants_pen && !wm->pen_probably_down) {
|
|
u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
if (!(data & WM97XX_PEN_DOWN))
|
|
return RC_PENUP;
|
|
wm->pen_probably_down = 1;
|
|
}
|
|
|
|
/* set up digitiser */
|
|
dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
|
|
dig1 &= ~WM9713_ADCSEL_MASK;
|
|
/* WM97XX_ADCSEL_* channels need to be converted to WM9713 format */
|
|
dig1 |= 1 << ((adcsel & WM97XX_ADCSEL_MASK) >> 12);
|
|
|
|
if (wm->mach_ops && wm->mach_ops->pre_sample)
|
|
wm->mach_ops->pre_sample(adcsel);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | WM9713_POLL);
|
|
|
|
/* wait 3 AC97 time slots + delay for conversion */
|
|
poll_delay(delay);
|
|
|
|
/* wait for POLL to go low */
|
|
while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) &&
|
|
timeout) {
|
|
udelay(AC97_LINK_FRAME);
|
|
timeout--;
|
|
}
|
|
|
|
if (timeout <= 0) {
|
|
/* If PDEN is set, we can get a timeout when pen goes up */
|
|
if (is_pden(wm))
|
|
wm->pen_probably_down = 0;
|
|
else
|
|
dev_dbg(wm->dev, "adc sample timeout");
|
|
return RC_PENUP;
|
|
}
|
|
|
|
*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
if (wm->mach_ops && wm->mach_ops->post_sample)
|
|
wm->mach_ops->post_sample(adcsel);
|
|
|
|
/* check we have correct sample */
|
|
if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
|
|
dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
|
|
adcsel & WM97XX_ADCSEL_MASK,
|
|
*sample & WM97XX_ADCSEL_MASK);
|
|
return RC_PENUP;
|
|
}
|
|
|
|
if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
|
|
wm->pen_probably_down = 0;
|
|
return RC_PENUP;
|
|
}
|
|
|
|
return RC_VALID;
|
|
}
|
|
|
|
/*
|
|
* Read a coordinate from the WM9713 adc in polling mode.
|
|
*/
|
|
static int wm9713_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
|
|
{
|
|
u16 dig1;
|
|
int timeout = 5 * delay;
|
|
|
|
if (!wm->pen_probably_down) {
|
|
u16 val = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
if (!(val & WM97XX_PEN_DOWN))
|
|
return RC_PENUP;
|
|
wm->pen_probably_down = 1;
|
|
}
|
|
|
|
/* set up digitiser */
|
|
dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
|
|
dig1 &= ~WM9713_ADCSEL_MASK;
|
|
if (pil)
|
|
dig1 |= WM9713_ADCSEL_PRES;
|
|
|
|
if (wm->mach_ops && wm->mach_ops->pre_sample)
|
|
wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1,
|
|
dig1 | WM9713_POLL | WM9713_COO);
|
|
|
|
/* wait 3 AC97 time slots + delay for conversion */
|
|
poll_delay(delay);
|
|
data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
/* wait for POLL to go low */
|
|
while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL)
|
|
&& timeout) {
|
|
udelay(AC97_LINK_FRAME);
|
|
timeout--;
|
|
}
|
|
|
|
if (timeout <= 0) {
|
|
/* If PDEN is set, we can get a timeout when pen goes up */
|
|
if (is_pden(wm))
|
|
wm->pen_probably_down = 0;
|
|
else
|
|
dev_dbg(wm->dev, "adc sample timeout");
|
|
return RC_PENUP;
|
|
}
|
|
|
|
/* read back data */
|
|
data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
if (pil)
|
|
data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
|
|
else
|
|
data->p = DEFAULT_PRESSURE;
|
|
|
|
if (wm->mach_ops && wm->mach_ops->post_sample)
|
|
wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
|
|
|
|
/* check we have correct sample */
|
|
if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
|
|
goto err;
|
|
if (pil && !(data->p & WM97XX_ADCSEL_PRES))
|
|
goto err;
|
|
|
|
if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
|
|
wm->pen_probably_down = 0;
|
|
return RC_PENUP;
|
|
}
|
|
return RC_VALID;
|
|
err:
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Sample the WM9713 touchscreen in polling mode
|
|
*/
|
|
static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
|
|
{
|
|
int rc;
|
|
|
|
if (coord) {
|
|
rc = wm9713_poll_coord(wm, data);
|
|
if (rc != RC_VALID)
|
|
return rc;
|
|
} else {
|
|
rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);
|
|
if (rc != RC_VALID)
|
|
return rc;
|
|
rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
|
|
if (rc != RC_VALID)
|
|
return rc;
|
|
if (pil) {
|
|
rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
|
|
&data->p);
|
|
if (rc != RC_VALID)
|
|
return rc;
|
|
} else
|
|
data->p = DEFAULT_PRESSURE;
|
|
}
|
|
return RC_VALID;
|
|
}
|
|
|
|
/*
|
|
* Enable WM9713 continuous mode, i.e. touch data is streamed across
|
|
* an AC97 slot
|
|
*/
|
|
static int wm9713_acc_enable(struct wm97xx *wm, int enable)
|
|
{
|
|
u16 dig1, dig2, dig3;
|
|
int ret = 0;
|
|
|
|
dig1 = wm->dig[0];
|
|
dig2 = wm->dig[1];
|
|
dig3 = wm->dig[2];
|
|
|
|
if (enable) {
|
|
/* continuous mode */
|
|
if (wm->mach_ops->acc_startup &&
|
|
(ret = wm->mach_ops->acc_startup(wm)) < 0)
|
|
return ret;
|
|
|
|
dig1 &= ~WM9713_ADCSEL_MASK;
|
|
dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X |
|
|
WM9713_ADCSEL_Y;
|
|
if (pil)
|
|
dig1 |= WM9713_ADCSEL_PRES;
|
|
dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK |
|
|
WM97XX_CM_RATE_MASK);
|
|
dig2 |= WM97XX_SLEN | WM97XX_DELAY(delay) |
|
|
WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate);
|
|
dig3 |= WM9713_PDEN;
|
|
} else {
|
|
dig1 &= ~(WM9713_CTC | WM9713_COO);
|
|
dig2 &= ~WM97XX_SLEN;
|
|
dig3 &= ~WM9713_PDEN;
|
|
if (wm->mach_ops->acc_shutdown)
|
|
wm->mach_ops->acc_shutdown(wm);
|
|
}
|
|
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
|
|
wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct wm97xx_codec_drv wm9713_codec = {
|
|
.id = WM9713_ID2,
|
|
.name = "wm9713",
|
|
.poll_sample = wm9713_poll_sample,
|
|
.poll_touch = wm9713_poll_touch,
|
|
.acc_enable = wm9713_acc_enable,
|
|
.phy_init = wm9713_phy_init,
|
|
.dig_enable = wm9713_dig_enable,
|
|
.dig_restore = wm9713_dig_restore,
|
|
.aux_prepare = wm9713_aux_prepare,
|
|
};
|
|
EXPORT_SYMBOL_GPL(wm9713_codec);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
|
|
MODULE_DESCRIPTION("WM9713 Touch Screen Driver");
|
|
MODULE_LICENSE("GPL");
|