forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
476 lines
12 KiB
476 lines
12 KiB
// 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 <[email protected]> |
|
* Parts Copyright : Ian Molton <[email protected]> |
|
* Andrew Zabolotny <[email protected]> |
|
* Russell King <[email protected]> |
|
*/ |
|
|
|
#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 <[email protected]>"); |
|
MODULE_DESCRIPTION("WM9713 Touch Screen Driver"); |
|
MODULE_LICENSE("GPL");
|
|
|