155c04de5SPatil, Rachna /*
255c04de5SPatil, Rachna * TI Touch Screen driver
355c04de5SPatil, Rachna *
455c04de5SPatil, Rachna * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
555c04de5SPatil, Rachna *
655c04de5SPatil, Rachna * This program is free software; you can redistribute it and/or
755c04de5SPatil, Rachna * modify it under the terms of the GNU General Public License as
855c04de5SPatil, Rachna * published by the Free Software Foundation version 2.
955c04de5SPatil, Rachna *
1055c04de5SPatil, Rachna * This program is distributed "as is" WITHOUT ANY WARRANTY of any
1155c04de5SPatil, Rachna * kind, whether express or implied; without even the implied warranty
1255c04de5SPatil, Rachna * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1355c04de5SPatil, Rachna * GNU General Public License for more details.
1455c04de5SPatil, Rachna */
1555c04de5SPatil, Rachna
1655c04de5SPatil, Rachna
1755c04de5SPatil, Rachna #include <linux/kernel.h>
1855c04de5SPatil, Rachna #include <linux/err.h>
1955c04de5SPatil, Rachna #include <linux/module.h>
2055c04de5SPatil, Rachna #include <linux/input.h>
2155c04de5SPatil, Rachna #include <linux/slab.h>
2255c04de5SPatil, Rachna #include <linux/interrupt.h>
2355c04de5SPatil, Rachna #include <linux/clk.h>
2455c04de5SPatil, Rachna #include <linux/platform_device.h>
2555c04de5SPatil, Rachna #include <linux/io.h>
2655c04de5SPatil, Rachna #include <linux/delay.h>
270396310bSPatil, Rachna #include <linux/of.h>
2883edfdf3SVignesh R #include <linux/sort.h>
297a39915bSVignesh R #include <linux/pm_wakeirq.h>
3055c04de5SPatil, Rachna
312b99bafaSPatil, Rachna #include <linux/mfd/ti_am335x_tscadc.h>
3255c04de5SPatil, Rachna
3355c04de5SPatil, Rachna #define ADCFSM_STEPID 0x10
3455c04de5SPatil, Rachna #define SEQ_SETTLE 275
3555c04de5SPatil, Rachna #define MAX_12BIT ((1 << 12) - 1)
3655c04de5SPatil, Rachna
3746850420SGrygorii Strashko #define TSC_IRQENB_MASK (IRQENB_FIFO0THRES | IRQENB_EOS | IRQENB_HW_PEN)
3846850420SGrygorii Strashko
39bb76dc09SPatil, Rachna static const int config_pins[] = {
40bb76dc09SPatil, Rachna STEPCONFIG_XPP,
41bb76dc09SPatil, Rachna STEPCONFIG_XNN,
42bb76dc09SPatil, Rachna STEPCONFIG_YPP,
43bb76dc09SPatil, Rachna STEPCONFIG_YNN,
44bb76dc09SPatil, Rachna };
45bb76dc09SPatil, Rachna
4655c04de5SPatil, Rachna struct titsc {
4755c04de5SPatil, Rachna struct input_dev *input;
482b99bafaSPatil, Rachna struct ti_tscadc_dev *mfd_tscadc;
49333e07ecSVignesh R struct device *dev;
5055c04de5SPatil, Rachna unsigned int irq;
5155c04de5SPatil, Rachna unsigned int wires;
5255c04de5SPatil, Rachna unsigned int x_plate_resistance;
5355c04de5SPatil, Rachna bool pen_down;
540396310bSPatil, Rachna int coordinate_readouts;
55bb76dc09SPatil, Rachna u32 config_inp[4];
56bb76dc09SPatil, Rachna u32 bit_xp, bit_xn, bit_yp, bit_yn;
57bb76dc09SPatil, Rachna u32 inp_xp, inp_xn, inp_yp, inp_yn;
58baee5399SZubair Lutfullah u32 step_mask;
59bf223612SVignesh R u32 charge_delay;
6055c04de5SPatil, Rachna };
6155c04de5SPatil, Rachna
titsc_readl(struct titsc * ts,unsigned int reg)6255c04de5SPatil, Rachna static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
6355c04de5SPatil, Rachna {
642b99bafaSPatil, Rachna return readl(ts->mfd_tscadc->tscadc_base + reg);
6555c04de5SPatil, Rachna }
6655c04de5SPatil, Rachna
titsc_writel(struct titsc * tsc,unsigned int reg,unsigned int val)6755c04de5SPatil, Rachna static void titsc_writel(struct titsc *tsc, unsigned int reg,
6855c04de5SPatil, Rachna unsigned int val)
6955c04de5SPatil, Rachna {
702b99bafaSPatil, Rachna writel(val, tsc->mfd_tscadc->tscadc_base + reg);
7155c04de5SPatil, Rachna }
7255c04de5SPatil, Rachna
titsc_config_wires(struct titsc * ts_dev)73bb76dc09SPatil, Rachna static int titsc_config_wires(struct titsc *ts_dev)
74bb76dc09SPatil, Rachna {
75bb76dc09SPatil, Rachna u32 analog_line[4];
76bb76dc09SPatil, Rachna u32 wire_order[4];
77bb76dc09SPatil, Rachna int i, bit_cfg;
78bb76dc09SPatil, Rachna
79bb76dc09SPatil, Rachna for (i = 0; i < 4; i++) {
80bb76dc09SPatil, Rachna /*
81bb76dc09SPatil, Rachna * Get the order in which TSC wires are attached
82bb76dc09SPatil, Rachna * w.r.t. each of the analog input lines on the EVM.
83bb76dc09SPatil, Rachna */
84bb76dc09SPatil, Rachna analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4;
85bb76dc09SPatil, Rachna wire_order[i] = ts_dev->config_inp[i] & 0x0F;
86bb76dc09SPatil, Rachna if (WARN_ON(analog_line[i] > 7))
87bb76dc09SPatil, Rachna return -EINVAL;
88bb76dc09SPatil, Rachna if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins)))
89bb76dc09SPatil, Rachna return -EINVAL;
90bb76dc09SPatil, Rachna }
91bb76dc09SPatil, Rachna
92bb76dc09SPatil, Rachna for (i = 0; i < 4; i++) {
93bb76dc09SPatil, Rachna int an_line;
94bb76dc09SPatil, Rachna int wi_order;
95bb76dc09SPatil, Rachna
96bb76dc09SPatil, Rachna an_line = analog_line[i];
97bb76dc09SPatil, Rachna wi_order = wire_order[i];
98bb76dc09SPatil, Rachna bit_cfg = config_pins[wi_order];
99bb76dc09SPatil, Rachna if (bit_cfg == 0)
100bb76dc09SPatil, Rachna return -EINVAL;
101bb76dc09SPatil, Rachna switch (wi_order) {
102bb76dc09SPatil, Rachna case 0:
103bb76dc09SPatil, Rachna ts_dev->bit_xp = bit_cfg;
104bb76dc09SPatil, Rachna ts_dev->inp_xp = an_line;
105bb76dc09SPatil, Rachna break;
106bb76dc09SPatil, Rachna
107bb76dc09SPatil, Rachna case 1:
108bb76dc09SPatil, Rachna ts_dev->bit_xn = bit_cfg;
109bb76dc09SPatil, Rachna ts_dev->inp_xn = an_line;
110bb76dc09SPatil, Rachna break;
111bb76dc09SPatil, Rachna
112bb76dc09SPatil, Rachna case 2:
113bb76dc09SPatil, Rachna ts_dev->bit_yp = bit_cfg;
114bb76dc09SPatil, Rachna ts_dev->inp_yp = an_line;
115bb76dc09SPatil, Rachna break;
116bb76dc09SPatil, Rachna case 3:
117bb76dc09SPatil, Rachna ts_dev->bit_yn = bit_cfg;
118bb76dc09SPatil, Rachna ts_dev->inp_yn = an_line;
119bb76dc09SPatil, Rachna break;
120bb76dc09SPatil, Rachna }
121bb76dc09SPatil, Rachna }
122bb76dc09SPatil, Rachna return 0;
123bb76dc09SPatil, Rachna }
124bb76dc09SPatil, Rachna
titsc_step_config(struct titsc * ts_dev)12555c04de5SPatil, Rachna static void titsc_step_config(struct titsc *ts_dev)
12655c04de5SPatil, Rachna {
12755c04de5SPatil, Rachna unsigned int config;
12823dee6c6SDario Binacchi int i, n;
1293a59684cSBrad Griffis int end_step, first_step, tsc_steps;
1308c896308SSebastian Andrzej Siewior u32 stepenable;
13155c04de5SPatil, Rachna
13255c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC |
13373cca71aSDario Binacchi STEPCONFIG_AVG_16 | ts_dev->bit_xp |
13473cca71aSDario Binacchi STEPCONFIG_INM_ADCREFM;
13555c04de5SPatil, Rachna switch (ts_dev->wires) {
13655c04de5SPatil, Rachna case 4:
137bb76dc09SPatil, Rachna config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
13855c04de5SPatil, Rachna break;
13955c04de5SPatil, Rachna case 5:
140bb76dc09SPatil, Rachna config |= ts_dev->bit_yn |
141bb76dc09SPatil, Rachna STEPCONFIG_INP_AN4 | ts_dev->bit_xn |
142bb76dc09SPatil, Rachna ts_dev->bit_yp;
14355c04de5SPatil, Rachna break;
14455c04de5SPatil, Rachna case 8:
145bb76dc09SPatil, Rachna config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
14655c04de5SPatil, Rachna break;
14755c04de5SPatil, Rachna }
14855c04de5SPatil, Rachna
1493a59684cSBrad Griffis tsc_steps = ts_dev->coordinate_readouts * 2 + 2;
1503a59684cSBrad Griffis first_step = TOTAL_STEPS - tsc_steps;
1513a59684cSBrad Griffis /* Steps 16 to 16-coordinate_readouts is for X */
1523a59684cSBrad Griffis end_step = first_step + tsc_steps;
15323dee6c6SDario Binacchi n = 0;
1543a59684cSBrad Griffis for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) {
15555c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
15623dee6c6SDario Binacchi titsc_writel(ts_dev, REG_STEPDELAY(i),
15723dee6c6SDario Binacchi n++ == 0 ? STEPCONFIG_OPENDLY : 0);
15855c04de5SPatil, Rachna }
15955c04de5SPatil, Rachna
16055c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC |
161bb76dc09SPatil, Rachna STEPCONFIG_AVG_16 | ts_dev->bit_yn |
1628c896308SSebastian Andrzej Siewior STEPCONFIG_INM_ADCREFM;
16355c04de5SPatil, Rachna switch (ts_dev->wires) {
16455c04de5SPatil, Rachna case 4:
165bb76dc09SPatil, Rachna config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
16655c04de5SPatil, Rachna break;
16755c04de5SPatil, Rachna case 5:
168bb76dc09SPatil, Rachna config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 |
169cf5dd489SJeff Lance STEPCONFIG_XNP | STEPCONFIG_YPN;
17055c04de5SPatil, Rachna break;
17155c04de5SPatil, Rachna case 8:
172bb76dc09SPatil, Rachna config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
17355c04de5SPatil, Rachna break;
17455c04de5SPatil, Rachna }
17555c04de5SPatil, Rachna
1763a59684cSBrad Griffis /* 1 ... coordinate_readouts is for Y */
1773a59684cSBrad Griffis end_step = first_step + ts_dev->coordinate_readouts;
17823dee6c6SDario Binacchi n = 0;
1793a59684cSBrad Griffis for (i = first_step; i < end_step; i++) {
18055c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
18123dee6c6SDario Binacchi titsc_writel(ts_dev, REG_STEPDELAY(i),
18223dee6c6SDario Binacchi n++ == 0 ? STEPCONFIG_OPENDLY : 0);
18355c04de5SPatil, Rachna }
18455c04de5SPatil, Rachna
185344d635bSBrad Griffis /* Make CHARGECONFIG same as IDLECONFIG */
18655c04de5SPatil, Rachna
187344d635bSBrad Griffis config = titsc_readl(ts_dev, REG_IDLECONFIG);
18855c04de5SPatil, Rachna titsc_writel(ts_dev, REG_CHARGECONFIG, config);
189bf223612SVignesh R titsc_writel(ts_dev, REG_CHARGEDELAY, ts_dev->charge_delay);
19055c04de5SPatil, Rachna
1913a59684cSBrad Griffis /* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */
19255c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC |
193bb76dc09SPatil, Rachna STEPCONFIG_AVG_16 | ts_dev->bit_yp |
194bb76dc09SPatil, Rachna ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
195bb76dc09SPatil, Rachna STEPCONFIG_INP(ts_dev->inp_xp);
1968c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
1978c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPDELAY(end_step),
19855c04de5SPatil, Rachna STEPCONFIG_OPENDLY);
19955c04de5SPatil, Rachna
2008c896308SSebastian Andrzej Siewior end_step++;
2016bfeb6c2SDario Binacchi config = STEPCONFIG_MODE_HWSYNC |
2026bfeb6c2SDario Binacchi STEPCONFIG_AVG_16 | ts_dev->bit_yp |
2036bfeb6c2SDario Binacchi ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
2046bfeb6c2SDario Binacchi STEPCONFIG_INP(ts_dev->inp_yn);
2058c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
2068c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPDELAY(end_step),
20755c04de5SPatil, Rachna STEPCONFIG_OPENDLY);
20855c04de5SPatil, Rachna
2093a59684cSBrad Griffis /* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */
2103a59684cSBrad Griffis stepenable = 1;
2113a59684cSBrad Griffis for (i = 0; i < tsc_steps; i++)
2123a59684cSBrad Griffis stepenable |= 1 << (first_step + i + 1);
2133a59684cSBrad Griffis
214baee5399SZubair Lutfullah ts_dev->step_mask = stepenable;
2157e170c6eSSebastian Andrzej Siewior am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask);
21655c04de5SPatil, Rachna }
21755c04de5SPatil, Rachna
titsc_cmp_coord(const void * a,const void * b)21883edfdf3SVignesh R static int titsc_cmp_coord(const void *a, const void *b)
21983edfdf3SVignesh R {
22083edfdf3SVignesh R return *(int *)a - *(int *)b;
22183edfdf3SVignesh R }
22283edfdf3SVignesh R
titsc_read_coordinates(struct titsc * ts_dev,u32 * x,u32 * y,u32 * z1,u32 * z2)22355c04de5SPatil, Rachna static void titsc_read_coordinates(struct titsc *ts_dev,
2248c896308SSebastian Andrzej Siewior u32 *x, u32 *y, u32 *z1, u32 *z2)
22555c04de5SPatil, Rachna {
22683edfdf3SVignesh R unsigned int yvals[7], xvals[7];
22783edfdf3SVignesh R unsigned int i, xsum = 0, ysum = 0;
2288c896308SSebastian Andrzej Siewior unsigned int creads = ts_dev->coordinate_readouts;
22955c04de5SPatil, Rachna
23083edfdf3SVignesh R for (i = 0; i < creads; i++) {
23183edfdf3SVignesh R yvals[i] = titsc_readl(ts_dev, REG_FIFO0);
23283edfdf3SVignesh R yvals[i] &= 0xfff;
23383edfdf3SVignesh R }
23483edfdf3SVignesh R
23583edfdf3SVignesh R *z1 = titsc_readl(ts_dev, REG_FIFO0);
23683edfdf3SVignesh R *z1 &= 0xfff;
23783edfdf3SVignesh R *z2 = titsc_readl(ts_dev, REG_FIFO0);
23883edfdf3SVignesh R *z2 &= 0xfff;
23983edfdf3SVignesh R
24083edfdf3SVignesh R for (i = 0; i < creads; i++) {
24183edfdf3SVignesh R xvals[i] = titsc_readl(ts_dev, REG_FIFO0);
24283edfdf3SVignesh R xvals[i] &= 0xfff;
24383edfdf3SVignesh R }
24483edfdf3SVignesh R
24555c04de5SPatil, Rachna /*
24683edfdf3SVignesh R * If co-ordinates readouts is less than 4 then
24783edfdf3SVignesh R * report the average. In case of 4 or more
24883edfdf3SVignesh R * readouts, sort the co-ordinate samples, drop
24983edfdf3SVignesh R * min and max values and report the average of
25083edfdf3SVignesh R * remaining values.
25155c04de5SPatil, Rachna */
25283edfdf3SVignesh R if (creads <= 3) {
25383edfdf3SVignesh R for (i = 0; i < creads; i++) {
25483edfdf3SVignesh R ysum += yvals[i];
25583edfdf3SVignesh R xsum += xvals[i];
25655c04de5SPatil, Rachna }
25783edfdf3SVignesh R ysum /= creads;
25883edfdf3SVignesh R xsum /= creads;
25983edfdf3SVignesh R } else {
26083edfdf3SVignesh R sort(yvals, creads, sizeof(unsigned int),
26183edfdf3SVignesh R titsc_cmp_coord, NULL);
26283edfdf3SVignesh R sort(xvals, creads, sizeof(unsigned int),
26383edfdf3SVignesh R titsc_cmp_coord, NULL);
26483edfdf3SVignesh R for (i = 1; i < creads - 1; i++) {
26583edfdf3SVignesh R ysum += yvals[i];
26683edfdf3SVignesh R xsum += xvals[i];
26755c04de5SPatil, Rachna }
26883edfdf3SVignesh R ysum /= creads - 2;
26983edfdf3SVignesh R xsum /= creads - 2;
27055c04de5SPatil, Rachna }
27183edfdf3SVignesh R *y = ysum;
27283edfdf3SVignesh R *x = xsum;
2732b99bafaSPatil, Rachna }
27455c04de5SPatil, Rachna
titsc_irq(int irq,void * dev)27555c04de5SPatil, Rachna static irqreturn_t titsc_irq(int irq, void *dev)
27655c04de5SPatil, Rachna {
27755c04de5SPatil, Rachna struct titsc *ts_dev = dev;
27855c04de5SPatil, Rachna struct input_dev *input_dev = ts_dev->input;
279344d635bSBrad Griffis unsigned int fsm, status, irqclr = 0;
28055c04de5SPatil, Rachna unsigned int x = 0, y = 0;
28155c04de5SPatil, Rachna unsigned int z1, z2, z;
28255c04de5SPatil, Rachna
283344d635bSBrad Griffis status = titsc_readl(ts_dev, REG_RAWIRQSTATUS);
284344d635bSBrad Griffis if (status & IRQENB_HW_PEN) {
285344d635bSBrad Griffis ts_dev->pen_down = true;
286344d635bSBrad Griffis irqclr |= IRQENB_HW_PEN;
287333e07ecSVignesh R pm_stay_awake(ts_dev->dev);
288344d635bSBrad Griffis }
289344d635bSBrad Griffis
290344d635bSBrad Griffis if (status & IRQENB_PENUP) {
291344d635bSBrad Griffis fsm = titsc_readl(ts_dev, REG_ADCFSM);
292344d635bSBrad Griffis if (fsm == ADCFSM_STEPID) {
293344d635bSBrad Griffis ts_dev->pen_down = false;
294344d635bSBrad Griffis input_report_key(input_dev, BTN_TOUCH, 0);
295344d635bSBrad Griffis input_report_abs(input_dev, ABS_PRESSURE, 0);
296344d635bSBrad Griffis input_sync(input_dev);
297333e07ecSVignesh R pm_relax(ts_dev->dev);
298344d635bSBrad Griffis } else {
299344d635bSBrad Griffis ts_dev->pen_down = true;
300344d635bSBrad Griffis }
301344d635bSBrad Griffis irqclr |= IRQENB_PENUP;
302344d635bSBrad Griffis }
303344d635bSBrad Griffis
304344d635bSBrad Griffis if (status & IRQENB_EOS)
305344d635bSBrad Griffis irqclr |= IRQENB_EOS;
306344d635bSBrad Griffis
307baee5399SZubair Lutfullah /*
308baee5399SZubair Lutfullah * ADC and touchscreen share the IRQ line.
309baee5399SZubair Lutfullah * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only
310baee5399SZubair Lutfullah */
31155c04de5SPatil, Rachna if (status & IRQENB_FIFO0THRES) {
31255c04de5SPatil, Rachna
3138c896308SSebastian Andrzej Siewior titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
3142b99bafaSPatil, Rachna
31555c04de5SPatil, Rachna if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
31655c04de5SPatil, Rachna /*
31755c04de5SPatil, Rachna * Calculate pressure using formula
31855c04de5SPatil, Rachna * Resistance(touch) = x plate resistance *
319b6e43dddSQinghua Jin * x position/4096 * ((z2 / z1) - 1)
32055c04de5SPatil, Rachna */
3218c896308SSebastian Andrzej Siewior z = z1 - z2;
32255c04de5SPatil, Rachna z *= x;
32355c04de5SPatil, Rachna z *= ts_dev->x_plate_resistance;
3248c896308SSebastian Andrzej Siewior z /= z2;
32555c04de5SPatil, Rachna z = (z + 2047) >> 12;
32655c04de5SPatil, Rachna
32755c04de5SPatil, Rachna if (z <= MAX_12BIT) {
32855c04de5SPatil, Rachna input_report_abs(input_dev, ABS_X, x);
32955c04de5SPatil, Rachna input_report_abs(input_dev, ABS_Y, y);
33055c04de5SPatil, Rachna input_report_abs(input_dev, ABS_PRESSURE, z);
33155c04de5SPatil, Rachna input_report_key(input_dev, BTN_TOUCH, 1);
33255c04de5SPatil, Rachna input_sync(input_dev);
33355c04de5SPatil, Rachna }
33455c04de5SPatil, Rachna }
33555c04de5SPatil, Rachna irqclr |= IRQENB_FIFO0THRES;
33655c04de5SPatil, Rachna }
3379a28b883SSebastian Andrzej Siewior if (irqclr) {
33855c04de5SPatil, Rachna titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
339344d635bSBrad Griffis if (status & IRQENB_EOS)
340344d635bSBrad Griffis am335x_tsc_se_set_cache(ts_dev->mfd_tscadc,
341344d635bSBrad Griffis ts_dev->step_mask);
34255c04de5SPatil, Rachna return IRQ_HANDLED;
34355c04de5SPatil, Rachna }
3449a28b883SSebastian Andrzej Siewior return IRQ_NONE;
3459a28b883SSebastian Andrzej Siewior }
34655c04de5SPatil, Rachna
titsc_parse_dt(struct platform_device * pdev,struct titsc * ts_dev)3470396310bSPatil, Rachna static int titsc_parse_dt(struct platform_device *pdev,
3480396310bSPatil, Rachna struct titsc *ts_dev)
3490396310bSPatil, Rachna {
3500396310bSPatil, Rachna struct device_node *node = pdev->dev.of_node;
3510396310bSPatil, Rachna int err;
3520396310bSPatil, Rachna
3530396310bSPatil, Rachna if (!node)
3540396310bSPatil, Rachna return -EINVAL;
3550396310bSPatil, Rachna
3560396310bSPatil, Rachna err = of_property_read_u32(node, "ti,wires", &ts_dev->wires);
3570396310bSPatil, Rachna if (err < 0)
3580396310bSPatil, Rachna return err;
3590396310bSPatil, Rachna switch (ts_dev->wires) {
3600396310bSPatil, Rachna case 4:
3610396310bSPatil, Rachna case 5:
3620396310bSPatil, Rachna case 8:
3630396310bSPatil, Rachna break;
3640396310bSPatil, Rachna default:
3650396310bSPatil, Rachna return -EINVAL;
3660396310bSPatil, Rachna }
3670396310bSPatil, Rachna
3680396310bSPatil, Rachna err = of_property_read_u32(node, "ti,x-plate-resistance",
3690396310bSPatil, Rachna &ts_dev->x_plate_resistance);
3700396310bSPatil, Rachna if (err < 0)
3710396310bSPatil, Rachna return err;
3720396310bSPatil, Rachna
373c9aeb249SFelipe Balbi /*
374c9aeb249SFelipe Balbi * Try with the new binding first. If it fails, try again with
375c9aeb249SFelipe Balbi * bogus, miss-spelled version.
376c9aeb249SFelipe Balbi */
377c9aeb249SFelipe Balbi err = of_property_read_u32(node, "ti,coordinate-readouts",
378c9aeb249SFelipe Balbi &ts_dev->coordinate_readouts);
37931972f6eSFelipe Balbi if (err < 0) {
38031972f6eSFelipe Balbi dev_warn(&pdev->dev, "please use 'ti,coordinate-readouts' instead\n");
3810396310bSPatil, Rachna err = of_property_read_u32(node, "ti,coordiante-readouts",
3820396310bSPatil, Rachna &ts_dev->coordinate_readouts);
38331972f6eSFelipe Balbi }
38431972f6eSFelipe Balbi
3850396310bSPatil, Rachna if (err < 0)
3860396310bSPatil, Rachna return err;
3870396310bSPatil, Rachna
38883edfdf3SVignesh R if (ts_dev->coordinate_readouts <= 0) {
38983edfdf3SVignesh R dev_warn(&pdev->dev,
39083edfdf3SVignesh R "invalid co-ordinate readouts, resetting it to 5\n");
39183edfdf3SVignesh R ts_dev->coordinate_readouts = 5;
39283edfdf3SVignesh R }
39383edfdf3SVignesh R
394bf223612SVignesh R err = of_property_read_u32(node, "ti,charge-delay",
395bf223612SVignesh R &ts_dev->charge_delay);
396bf223612SVignesh R /*
397bf223612SVignesh R * If ti,charge-delay value is not specified, then use
398bf223612SVignesh R * CHARGEDLY_OPENDLY as the default value.
399bf223612SVignesh R */
400bf223612SVignesh R if (err < 0) {
401bf223612SVignesh R ts_dev->charge_delay = CHARGEDLY_OPENDLY;
402bf223612SVignesh R dev_warn(&pdev->dev, "ti,charge-delay not specified\n");
403bf223612SVignesh R }
404bf223612SVignesh R
4050396310bSPatil, Rachna return of_property_read_u32_array(node, "ti,wire-config",
4060396310bSPatil, Rachna ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
4070396310bSPatil, Rachna }
40855c04de5SPatil, Rachna
40955c04de5SPatil, Rachna /*
41055c04de5SPatil, Rachna * The functions for inserting/removing driver as a module.
41155c04de5SPatil, Rachna */
41255c04de5SPatil, Rachna
titsc_probe(struct platform_device * pdev)41331564cbdSLinus Torvalds static int titsc_probe(struct platform_device *pdev)
41455c04de5SPatil, Rachna {
41555c04de5SPatil, Rachna struct titsc *ts_dev;
41655c04de5SPatil, Rachna struct input_dev *input_dev;
417a9bce1b0SSebastian Andrzej Siewior struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
41855c04de5SPatil, Rachna int err;
4192b99bafaSPatil, Rachna
42055c04de5SPatil, Rachna /* Allocate memory for device */
421520d8267SAndrew F. Davis ts_dev = kzalloc(sizeof(*ts_dev), GFP_KERNEL);
42255c04de5SPatil, Rachna input_dev = input_allocate_device();
42355c04de5SPatil, Rachna if (!ts_dev || !input_dev) {
42455c04de5SPatil, Rachna dev_err(&pdev->dev, "failed to allocate memory.\n");
42555c04de5SPatil, Rachna err = -ENOMEM;
42655c04de5SPatil, Rachna goto err_free_mem;
42755c04de5SPatil, Rachna }
42855c04de5SPatil, Rachna
4292b99bafaSPatil, Rachna tscadc_dev->tsc = ts_dev;
4302b99bafaSPatil, Rachna ts_dev->mfd_tscadc = tscadc_dev;
43155c04de5SPatil, Rachna ts_dev->input = input_dev;
4322b99bafaSPatil, Rachna ts_dev->irq = tscadc_dev->irq;
433333e07ecSVignesh R ts_dev->dev = &pdev->dev;
4340396310bSPatil, Rachna
4350396310bSPatil, Rachna err = titsc_parse_dt(pdev, ts_dev);
4360396310bSPatil, Rachna if (err) {
4370396310bSPatil, Rachna dev_err(&pdev->dev, "Could not find valid DT data.\n");
4380396310bSPatil, Rachna goto err_free_mem;
4390396310bSPatil, Rachna }
44055c04de5SPatil, Rachna
44155c04de5SPatil, Rachna err = request_irq(ts_dev->irq, titsc_irq,
442baee5399SZubair Lutfullah IRQF_SHARED, pdev->dev.driver->name, ts_dev);
44355c04de5SPatil, Rachna if (err) {
44455c04de5SPatil, Rachna dev_err(&pdev->dev, "failed to allocate irq.\n");
4452b99bafaSPatil, Rachna goto err_free_mem;
44655c04de5SPatil, Rachna }
44755c04de5SPatil, Rachna
448333e07ecSVignesh R device_init_wakeup(&pdev->dev, true);
4497a39915bSVignesh R err = dev_pm_set_wake_irq(&pdev->dev, ts_dev->irq);
4507a39915bSVignesh R if (err)
4517a39915bSVignesh R dev_err(&pdev->dev, "irq wake enable failed.\n");
452333e07ecSVignesh R
45346850420SGrygorii Strashko titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
45455c04de5SPatil, Rachna titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
455344d635bSBrad Griffis titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS);
456bb76dc09SPatil, Rachna err = titsc_config_wires(ts_dev);
457bb76dc09SPatil, Rachna if (err) {
458bb76dc09SPatil, Rachna dev_err(&pdev->dev, "wrong i/p wire configuration\n");
459bb76dc09SPatil, Rachna goto err_free_irq;
460bb76dc09SPatil, Rachna }
46155c04de5SPatil, Rachna titsc_step_config(ts_dev);
4628c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_FIFO0THR,
4638c896308SSebastian Andrzej Siewior ts_dev->coordinate_readouts * 2 + 2 - 1);
46455c04de5SPatil, Rachna
4652b99bafaSPatil, Rachna input_dev->name = "ti-tsc";
46655c04de5SPatil, Rachna input_dev->dev.parent = &pdev->dev;
46755c04de5SPatil, Rachna
46855c04de5SPatil, Rachna input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
46955c04de5SPatil, Rachna input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
47055c04de5SPatil, Rachna
47155c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
47255c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
47355c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);
47455c04de5SPatil, Rachna
47555c04de5SPatil, Rachna /* register to the input system */
47655c04de5SPatil, Rachna err = input_register_device(input_dev);
47755c04de5SPatil, Rachna if (err)
4782b99bafaSPatil, Rachna goto err_free_irq;
47955c04de5SPatil, Rachna
48055c04de5SPatil, Rachna platform_set_drvdata(pdev, ts_dev);
48155c04de5SPatil, Rachna return 0;
48255c04de5SPatil, Rachna
48355c04de5SPatil, Rachna err_free_irq:
4847a39915bSVignesh R dev_pm_clear_wake_irq(&pdev->dev);
485333e07ecSVignesh R device_init_wakeup(&pdev->dev, false);
48655c04de5SPatil, Rachna free_irq(ts_dev->irq, ts_dev);
48755c04de5SPatil, Rachna err_free_mem:
48855c04de5SPatil, Rachna input_free_device(input_dev);
48955c04de5SPatil, Rachna kfree(ts_dev);
49055c04de5SPatil, Rachna return err;
49155c04de5SPatil, Rachna }
49255c04de5SPatil, Rachna
titsc_remove(struct platform_device * pdev)493*d722a702SUwe Kleine-König static void titsc_remove(struct platform_device *pdev)
49455c04de5SPatil, Rachna {
495a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = platform_get_drvdata(pdev);
496a9bce1b0SSebastian Andrzej Siewior u32 steps;
49755c04de5SPatil, Rachna
4987a39915bSVignesh R dev_pm_clear_wake_irq(&pdev->dev);
499333e07ecSVignesh R device_init_wakeup(&pdev->dev, false);
50055c04de5SPatil, Rachna free_irq(ts_dev->irq, ts_dev);
50155c04de5SPatil, Rachna
502abeccee4SPatil, Rachna /* total steps followed by the enable mask */
5030396310bSPatil, Rachna steps = 2 * ts_dev->coordinate_readouts + 2;
504abeccee4SPatil, Rachna steps = (1 << steps) - 1;
505abeccee4SPatil, Rachna am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps);
506abeccee4SPatil, Rachna
50755c04de5SPatil, Rachna input_unregister_device(ts_dev->input);
50855c04de5SPatil, Rachna
5092b99bafaSPatil, Rachna kfree(ts_dev);
51055c04de5SPatil, Rachna }
51155c04de5SPatil, Rachna
titsc_suspend(struct device * dev)512f8401643SJonathan Cameron static int titsc_suspend(struct device *dev)
5132b99bafaSPatil, Rachna {
514a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = dev_get_drvdata(dev);
5152b99bafaSPatil, Rachna unsigned int idle;
5162b99bafaSPatil, Rachna
517333e07ecSVignesh R if (device_may_wakeup(dev)) {
51846850420SGrygorii Strashko titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
5192b99bafaSPatil, Rachna idle = titsc_readl(ts_dev, REG_IRQENABLE);
5202b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQENABLE,
5212b99bafaSPatil, Rachna (idle | IRQENB_HW_PEN));
5222b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
5232b99bafaSPatil, Rachna }
5242b99bafaSPatil, Rachna return 0;
5252b99bafaSPatil, Rachna }
5262b99bafaSPatil, Rachna
titsc_resume(struct device * dev)527f8401643SJonathan Cameron static int titsc_resume(struct device *dev)
5282b99bafaSPatil, Rachna {
529a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = dev_get_drvdata(dev);
5302b99bafaSPatil, Rachna
531333e07ecSVignesh R if (device_may_wakeup(dev)) {
5322b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQWAKEUP,
5332b99bafaSPatil, Rachna 0x00);
5342b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
535333e07ecSVignesh R pm_relax(dev);
5362b99bafaSPatil, Rachna }
5372b99bafaSPatil, Rachna titsc_step_config(ts_dev);
5382b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_FIFO0THR,
5398c896308SSebastian Andrzej Siewior ts_dev->coordinate_readouts * 2 + 2 - 1);
5402b99bafaSPatil, Rachna return 0;
5412b99bafaSPatil, Rachna }
5422b99bafaSPatil, Rachna
543f8401643SJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(titsc_pm_ops, titsc_suspend, titsc_resume);
5442b99bafaSPatil, Rachna
5450396310bSPatil, Rachna static const struct of_device_id ti_tsc_dt_ids[] = {
5460396310bSPatil, Rachna { .compatible = "ti,am3359-tsc", },
5470396310bSPatil, Rachna { }
5480396310bSPatil, Rachna };
5490396310bSPatil, Rachna MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids);
5500396310bSPatil, Rachna
55155c04de5SPatil, Rachna static struct platform_driver ti_tsc_driver = {
55255c04de5SPatil, Rachna .probe = titsc_probe,
553*d722a702SUwe Kleine-König .remove_new = titsc_remove,
55455c04de5SPatil, Rachna .driver = {
5555f184e63SSebastian Andrzej Siewior .name = "TI-am335x-tsc",
556f8401643SJonathan Cameron .pm = pm_sleep_ptr(&titsc_pm_ops),
5578e6146bfSSachin Kamat .of_match_table = ti_tsc_dt_ids,
55855c04de5SPatil, Rachna },
55955c04de5SPatil, Rachna };
56055c04de5SPatil, Rachna module_platform_driver(ti_tsc_driver);
56155c04de5SPatil, Rachna
56255c04de5SPatil, Rachna MODULE_DESCRIPTION("TI touchscreen controller driver");
56355c04de5SPatil, Rachna MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
56455c04de5SPatil, Rachna MODULE_LICENSE("GPL");
565