// 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/export.h>#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");
// 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/export.h>
#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");