6b13f685e
김민수
BSP 최초 추가
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#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 WM9705_VERSION "1.00"
#define DEFAULT_PRESSURE 0xb0c0
static int pil;
module_param(pil, int, 0);
MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
static int pressure = DEFAULT_PRESSURE & 0xfff;
module_param(pressure, int, 0);
MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
static int delay = 4;
module_param(delay, int, 0);
MODULE_PARM_DESC(delay, "Set adc sample delay.");
static int pdd = 8;
module_param(pdd, int, 0);
MODULE_PARM_DESC(pdd, "Set pen detect comparator threshold");
static int mask;
module_param(mask, int, 0);
MODULE_PARM_DESC(mask, "Set adc mask function.");
static const int delay_table[] = {
21,
42,
84,
167,
333,
667,
1000,
1333,
2000,
2667,
3333,
4000,
4667,
5333,
6000,
0
};
static inline void poll_delay(int d)
{
udelay(3 * AC97_LINK_FRAME + delay_table[d]);
}
static void wm9705_phy_init(struct wm97xx *wm)
{
u16 dig1 = 0, dig2 = WM97XX_RPR;
wm97xx_reg_write(wm, AC97_AUX, 0x8000);
wm97xx_reg_write(wm, AC97_VIDEO, 0x8000);
if (pil == 2) {
dig2 |= WM9705_PIL;
dev_dbg(wm->dev,
"setting pressure measurement current to 400uA.");
} else if (pil)
dev_dbg(wm->dev,
"setting pressure measurement current to 200uA.");
if (!pil)
pressure = 0;
if (delay != 4) {
if (delay < 0 || delay > 15) {
dev_dbg(wm->dev, "supplied delay out of range.");
delay = 4;
}
}
dig1 &= 0xff0f;
dig1 |= WM97XX_DELAY(delay);
dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",
delay_table[delay]);
dig2 |= (pdd & 0x000f);
dev_dbg(wm->dev, "setting pdd to Vmid/%d", 1 - (pdd & 0x000f));
dig2 |= ((mask & 0x3) << 4);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
}
static void wm9705_dig_enable(struct wm97xx *wm, int enable)
{
if (enable) {
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
wm->dig[2] | WM97XX_PRP_DET_DIG);
wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
} else
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
wm->dig[2] & ~WM97XX_PRP_DET_DIG);
}
static void wm9705_aux_prepare(struct wm97xx *wm)
{
memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
}
static void wm9705_dig_restore(struct wm97xx *wm)
{
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
}
static inline int is_pden(struct wm97xx *wm)
{
return wm->dig[2] & WM9705_PDEN;
}
static int wm9705_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
{
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;
}
if (wm->mach_ops && wm->mach_ops->pre_sample)
wm->mach_ops->pre_sample(adcsel);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, (adcsel & WM97XX_ADCSEL_MASK)
| WM97XX_POLL | WM97XX_DELAY(delay));
poll_delay(delay);
while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
&& timeout) {
udelay(AC97_LINK_FRAME);
timeout--;
}
if (timeout == 0) {
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);
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;
}
static int wm9705_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
{
int rc;
rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);
if (rc != RC_VALID)
return rc;
rc = wm9705_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
if (rc != RC_VALID)
return rc;
if (pil) {
rc = wm9705_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;
}
static int wm9705_acc_enable(struct wm97xx *wm, int enable)
{
u16 dig1, dig2;
int ret = 0;
dig1 = wm->dig[1];
dig2 = wm->dig[2];
if (enable) {
if (wm->mach_ops->acc_startup &&
(ret = wm->mach_ops->acc_startup(wm)) < 0)
return ret;
dig1 &= ~(WM97XX_CM_RATE_MASK | WM97XX_ADCSEL_MASK |
WM97XX_DELAY_MASK | WM97XX_SLT_MASK);
dig1 |= WM97XX_CTC | WM97XX_COO | WM97XX_SLEN |
WM97XX_DELAY(delay) |
WM97XX_SLT(wm->acc_slot) |
WM97XX_RATE(wm->acc_rate);
if (pil)
dig1 |= WM97XX_ADCSEL_PRES;
dig2 |= WM9705_PDEN;
} else {
dig1 &= ~(WM97XX_CTC | WM97XX_COO | WM97XX_SLEN);
dig2 &= ~WM9705_PDEN;
if (wm->mach_ops->acc_shutdown)
wm->mach_ops->acc_shutdown(wm);
}
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
return ret;
}
struct wm97xx_codec_drv wm9705_codec = {
.id = WM9705_ID2,
.name = "wm9705",
.poll_sample = wm9705_poll_sample,
.poll_touch = wm9705_poll_touch,
.acc_enable = wm9705_acc_enable,
.phy_init = wm9705_phy_init,
.dig_enable = wm9705_dig_enable,
.dig_restore = wm9705_dig_restore,
.aux_prepare = wm9705_aux_prepare,
};
EXPORT_SYMBOL_GPL(wm9705_codec);
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("WM9705 Touch Screen Driver");
MODULE_LICENSE("GPL");
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