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/init.h> 1855c04de5SPatil, Rachna #include <linux/kernel.h> 1955c04de5SPatil, Rachna #include <linux/err.h> 2055c04de5SPatil, Rachna #include <linux/module.h> 2155c04de5SPatil, Rachna #include <linux/input.h> 2255c04de5SPatil, Rachna #include <linux/slab.h> 2355c04de5SPatil, Rachna #include <linux/interrupt.h> 2455c04de5SPatil, Rachna #include <linux/clk.h> 2555c04de5SPatil, Rachna #include <linux/platform_device.h> 2655c04de5SPatil, Rachna #include <linux/io.h> 2755c04de5SPatil, Rachna #include <linux/delay.h> 280396310bSPatil, Rachna #include <linux/of.h> 290396310bSPatil, Rachna #include <linux/of_device.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 37bb76dc09SPatil, Rachna static const int config_pins[] = { 38bb76dc09SPatil, Rachna STEPCONFIG_XPP, 39bb76dc09SPatil, Rachna STEPCONFIG_XNN, 40bb76dc09SPatil, Rachna STEPCONFIG_YPP, 41bb76dc09SPatil, Rachna STEPCONFIG_YNN, 42bb76dc09SPatil, Rachna }; 43bb76dc09SPatil, Rachna 4455c04de5SPatil, Rachna struct titsc { 4555c04de5SPatil, Rachna struct input_dev *input; 462b99bafaSPatil, Rachna struct ti_tscadc_dev *mfd_tscadc; 4755c04de5SPatil, Rachna unsigned int irq; 4855c04de5SPatil, Rachna unsigned int wires; 4955c04de5SPatil, Rachna unsigned int x_plate_resistance; 5055c04de5SPatil, Rachna bool pen_down; 510396310bSPatil, Rachna int coordinate_readouts; 52bb76dc09SPatil, Rachna u32 config_inp[4]; 53bb76dc09SPatil, Rachna u32 bit_xp, bit_xn, bit_yp, bit_yn; 54bb76dc09SPatil, Rachna u32 inp_xp, inp_xn, inp_yp, inp_yn; 55*baee5399SZubair Lutfullah u32 step_mask; 5655c04de5SPatil, Rachna }; 5755c04de5SPatil, Rachna 5855c04de5SPatil, Rachna static unsigned int titsc_readl(struct titsc *ts, unsigned int reg) 5955c04de5SPatil, Rachna { 602b99bafaSPatil, Rachna return readl(ts->mfd_tscadc->tscadc_base + reg); 6155c04de5SPatil, Rachna } 6255c04de5SPatil, Rachna 6355c04de5SPatil, Rachna static void titsc_writel(struct titsc *tsc, unsigned int reg, 6455c04de5SPatil, Rachna unsigned int val) 6555c04de5SPatil, Rachna { 662b99bafaSPatil, Rachna writel(val, tsc->mfd_tscadc->tscadc_base + reg); 6755c04de5SPatil, Rachna } 6855c04de5SPatil, Rachna 69bb76dc09SPatil, Rachna static int titsc_config_wires(struct titsc *ts_dev) 70bb76dc09SPatil, Rachna { 71bb76dc09SPatil, Rachna u32 analog_line[4]; 72bb76dc09SPatil, Rachna u32 wire_order[4]; 73bb76dc09SPatil, Rachna int i, bit_cfg; 74bb76dc09SPatil, Rachna 75bb76dc09SPatil, Rachna for (i = 0; i < 4; i++) { 76bb76dc09SPatil, Rachna /* 77bb76dc09SPatil, Rachna * Get the order in which TSC wires are attached 78bb76dc09SPatil, Rachna * w.r.t. each of the analog input lines on the EVM. 79bb76dc09SPatil, Rachna */ 80bb76dc09SPatil, Rachna analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4; 81bb76dc09SPatil, Rachna wire_order[i] = ts_dev->config_inp[i] & 0x0F; 82bb76dc09SPatil, Rachna if (WARN_ON(analog_line[i] > 7)) 83bb76dc09SPatil, Rachna return -EINVAL; 84bb76dc09SPatil, Rachna if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins))) 85bb76dc09SPatil, Rachna return -EINVAL; 86bb76dc09SPatil, Rachna } 87bb76dc09SPatil, Rachna 88bb76dc09SPatil, Rachna for (i = 0; i < 4; i++) { 89bb76dc09SPatil, Rachna int an_line; 90bb76dc09SPatil, Rachna int wi_order; 91bb76dc09SPatil, Rachna 92bb76dc09SPatil, Rachna an_line = analog_line[i]; 93bb76dc09SPatil, Rachna wi_order = wire_order[i]; 94bb76dc09SPatil, Rachna bit_cfg = config_pins[wi_order]; 95bb76dc09SPatil, Rachna if (bit_cfg == 0) 96bb76dc09SPatil, Rachna return -EINVAL; 97bb76dc09SPatil, Rachna switch (wi_order) { 98bb76dc09SPatil, Rachna case 0: 99bb76dc09SPatil, Rachna ts_dev->bit_xp = bit_cfg; 100bb76dc09SPatil, Rachna ts_dev->inp_xp = an_line; 101bb76dc09SPatil, Rachna break; 102bb76dc09SPatil, Rachna 103bb76dc09SPatil, Rachna case 1: 104bb76dc09SPatil, Rachna ts_dev->bit_xn = bit_cfg; 105bb76dc09SPatil, Rachna ts_dev->inp_xn = an_line; 106bb76dc09SPatil, Rachna break; 107bb76dc09SPatil, Rachna 108bb76dc09SPatil, Rachna case 2: 109bb76dc09SPatil, Rachna ts_dev->bit_yp = bit_cfg; 110bb76dc09SPatil, Rachna ts_dev->inp_yp = an_line; 111bb76dc09SPatil, Rachna break; 112bb76dc09SPatil, Rachna case 3: 113bb76dc09SPatil, Rachna ts_dev->bit_yn = bit_cfg; 114bb76dc09SPatil, Rachna ts_dev->inp_yn = an_line; 115bb76dc09SPatil, Rachna break; 116bb76dc09SPatil, Rachna } 117bb76dc09SPatil, Rachna } 118bb76dc09SPatil, Rachna return 0; 119bb76dc09SPatil, Rachna } 120bb76dc09SPatil, Rachna 12155c04de5SPatil, Rachna static void titsc_step_config(struct titsc *ts_dev) 12255c04de5SPatil, Rachna { 12355c04de5SPatil, Rachna unsigned int config; 1248c896308SSebastian Andrzej Siewior int i; 1258c896308SSebastian Andrzej Siewior int end_step; 1268c896308SSebastian Andrzej Siewior u32 stepenable; 12755c04de5SPatil, Rachna 12855c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC | 129bb76dc09SPatil, Rachna STEPCONFIG_AVG_16 | ts_dev->bit_xp; 13055c04de5SPatil, Rachna switch (ts_dev->wires) { 13155c04de5SPatil, Rachna case 4: 132bb76dc09SPatil, Rachna config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; 13355c04de5SPatil, Rachna break; 13455c04de5SPatil, Rachna case 5: 135bb76dc09SPatil, Rachna config |= ts_dev->bit_yn | 136bb76dc09SPatil, Rachna STEPCONFIG_INP_AN4 | ts_dev->bit_xn | 137bb76dc09SPatil, Rachna ts_dev->bit_yp; 13855c04de5SPatil, Rachna break; 13955c04de5SPatil, Rachna case 8: 140bb76dc09SPatil, Rachna config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; 14155c04de5SPatil, Rachna break; 14255c04de5SPatil, Rachna } 14355c04de5SPatil, Rachna 1448c896308SSebastian Andrzej Siewior /* 1 … coordinate_readouts is for X */ 1458c896308SSebastian Andrzej Siewior end_step = ts_dev->coordinate_readouts; 1468c896308SSebastian Andrzej Siewior for (i = 0; i < end_step; i++) { 14755c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPCONFIG(i), config); 14855c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); 14955c04de5SPatil, Rachna } 15055c04de5SPatil, Rachna 15155c04de5SPatil, Rachna config = 0; 15255c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC | 153bb76dc09SPatil, Rachna STEPCONFIG_AVG_16 | ts_dev->bit_yn | 1548c896308SSebastian Andrzej Siewior STEPCONFIG_INM_ADCREFM; 15555c04de5SPatil, Rachna switch (ts_dev->wires) { 15655c04de5SPatil, Rachna case 4: 157bb76dc09SPatil, Rachna config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); 15855c04de5SPatil, Rachna break; 15955c04de5SPatil, Rachna case 5: 160bb76dc09SPatil, Rachna config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 | 161bb76dc09SPatil, Rachna ts_dev->bit_xn | ts_dev->bit_yp; 16255c04de5SPatil, Rachna break; 16355c04de5SPatil, Rachna case 8: 164bb76dc09SPatil, Rachna config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); 16555c04de5SPatil, Rachna break; 16655c04de5SPatil, Rachna } 16755c04de5SPatil, Rachna 1688c896308SSebastian Andrzej Siewior /* coordinate_readouts … coordinate_readouts * 2 is for Y */ 1698c896308SSebastian Andrzej Siewior end_step = ts_dev->coordinate_readouts * 2; 1708c896308SSebastian Andrzej Siewior for (i = ts_dev->coordinate_readouts; i < end_step; i++) { 17155c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPCONFIG(i), config); 17255c04de5SPatil, Rachna titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); 17355c04de5SPatil, Rachna } 17455c04de5SPatil, Rachna 17555c04de5SPatil, Rachna /* Charge step configuration */ 176bb76dc09SPatil, Rachna config = ts_dev->bit_xp | ts_dev->bit_yn | 17755c04de5SPatil, Rachna STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR | 178bb76dc09SPatil, Rachna STEPCHARGE_INM_AN1 | STEPCHARGE_INP(ts_dev->inp_yp); 17955c04de5SPatil, Rachna 18055c04de5SPatil, Rachna titsc_writel(ts_dev, REG_CHARGECONFIG, config); 18155c04de5SPatil, Rachna titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY); 18255c04de5SPatil, Rachna 1838c896308SSebastian Andrzej Siewior /* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */ 18455c04de5SPatil, Rachna config = STEPCONFIG_MODE_HWSYNC | 185bb76dc09SPatil, Rachna STEPCONFIG_AVG_16 | ts_dev->bit_yp | 186bb76dc09SPatil, Rachna ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | 187bb76dc09SPatil, Rachna STEPCONFIG_INP(ts_dev->inp_xp); 1888c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); 1898c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPDELAY(end_step), 19055c04de5SPatil, Rachna STEPCONFIG_OPENDLY); 19155c04de5SPatil, Rachna 1928c896308SSebastian Andrzej Siewior end_step++; 1938c896308SSebastian Andrzej Siewior config |= STEPCONFIG_INP(ts_dev->inp_yn); 1948c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); 1958c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_STEPDELAY(end_step), 19655c04de5SPatil, Rachna STEPCONFIG_OPENDLY); 19755c04de5SPatil, Rachna 198abeccee4SPatil, Rachna /* The steps1 … end and bit 0 for TS_Charge */ 1998c896308SSebastian Andrzej Siewior stepenable = (1 << (end_step + 2)) - 1; 200*baee5399SZubair Lutfullah ts_dev->step_mask = stepenable; 201*baee5399SZubair Lutfullah am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask); 20255c04de5SPatil, Rachna } 20355c04de5SPatil, Rachna 20455c04de5SPatil, Rachna static void titsc_read_coordinates(struct titsc *ts_dev, 2058c896308SSebastian Andrzej Siewior u32 *x, u32 *y, u32 *z1, u32 *z2) 20655c04de5SPatil, Rachna { 20755c04de5SPatil, Rachna unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT); 20855c04de5SPatil, Rachna unsigned int prev_val_x = ~0, prev_val_y = ~0; 20955c04de5SPatil, Rachna unsigned int prev_diff_x = ~0, prev_diff_y = ~0; 21055c04de5SPatil, Rachna unsigned int read, diff; 2112b99bafaSPatil, Rachna unsigned int i, channel; 2128c896308SSebastian Andrzej Siewior unsigned int creads = ts_dev->coordinate_readouts; 21355c04de5SPatil, Rachna 2148c896308SSebastian Andrzej Siewior *z1 = *z2 = 0; 2158c896308SSebastian Andrzej Siewior if (fifocount % (creads * 2 + 2)) 2168c896308SSebastian Andrzej Siewior fifocount -= fifocount % (creads * 2 + 2); 21755c04de5SPatil, Rachna /* 21855c04de5SPatil, Rachna * Delta filter is used to remove large variations in sampled 21955c04de5SPatil, Rachna * values from ADC. The filter tries to predict where the next 22055c04de5SPatil, Rachna * coordinate could be. This is done by taking a previous 22155c04de5SPatil, Rachna * coordinate and subtracting it form current one. Further the 22255c04de5SPatil, Rachna * algorithm compares the difference with that of a present value, 22355c04de5SPatil, Rachna * if true the value is reported to the sub system. 22455c04de5SPatil, Rachna */ 2258c896308SSebastian Andrzej Siewior for (i = 0; i < fifocount; i++) { 2262b99bafaSPatil, Rachna read = titsc_readl(ts_dev, REG_FIFO0); 2278c896308SSebastian Andrzej Siewior 2288c896308SSebastian Andrzej Siewior channel = (read & 0xf0000) >> 16; 2292b99bafaSPatil, Rachna read &= 0xfff; 2308c896308SSebastian Andrzej Siewior if (channel < creads) { 23155c04de5SPatil, Rachna diff = abs(read - prev_val_x); 23255c04de5SPatil, Rachna if (diff < prev_diff_x) { 23355c04de5SPatil, Rachna prev_diff_x = diff; 23455c04de5SPatil, Rachna *x = read; 23555c04de5SPatil, Rachna } 23655c04de5SPatil, Rachna prev_val_x = read; 23755c04de5SPatil, Rachna 2388c896308SSebastian Andrzej Siewior } else if (channel < creads * 2) { 23955c04de5SPatil, Rachna diff = abs(read - prev_val_y); 24055c04de5SPatil, Rachna if (diff < prev_diff_y) { 24155c04de5SPatil, Rachna prev_diff_y = diff; 24255c04de5SPatil, Rachna *y = read; 24355c04de5SPatil, Rachna } 24455c04de5SPatil, Rachna prev_val_y = read; 2458c896308SSebastian Andrzej Siewior 2468c896308SSebastian Andrzej Siewior } else if (channel < creads * 2 + 1) { 2478c896308SSebastian Andrzej Siewior *z1 = read; 2488c896308SSebastian Andrzej Siewior 2498c896308SSebastian Andrzej Siewior } else if (channel < creads * 2 + 2) { 2508c896308SSebastian Andrzej Siewior *z2 = read; 25155c04de5SPatil, Rachna } 25255c04de5SPatil, Rachna } 2532b99bafaSPatil, Rachna } 25455c04de5SPatil, Rachna 25555c04de5SPatil, Rachna static irqreturn_t titsc_irq(int irq, void *dev) 25655c04de5SPatil, Rachna { 25755c04de5SPatil, Rachna struct titsc *ts_dev = dev; 25855c04de5SPatil, Rachna struct input_dev *input_dev = ts_dev->input; 25955c04de5SPatil, Rachna unsigned int status, irqclr = 0; 26055c04de5SPatil, Rachna unsigned int x = 0, y = 0; 26155c04de5SPatil, Rachna unsigned int z1, z2, z; 26255c04de5SPatil, Rachna unsigned int fsm; 26355c04de5SPatil, Rachna 26455c04de5SPatil, Rachna status = titsc_readl(ts_dev, REG_IRQSTATUS); 265*baee5399SZubair Lutfullah /* 266*baee5399SZubair Lutfullah * ADC and touchscreen share the IRQ line. 267*baee5399SZubair Lutfullah * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only 268*baee5399SZubair Lutfullah */ 26955c04de5SPatil, Rachna if (status & IRQENB_FIFO0THRES) { 27055c04de5SPatil, Rachna 2718c896308SSebastian Andrzej Siewior titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2); 2722b99bafaSPatil, Rachna 27355c04de5SPatil, Rachna if (ts_dev->pen_down && z1 != 0 && z2 != 0) { 27455c04de5SPatil, Rachna /* 27555c04de5SPatil, Rachna * Calculate pressure using formula 27655c04de5SPatil, Rachna * Resistance(touch) = x plate resistance * 27755c04de5SPatil, Rachna * x postion/4096 * ((z2 / z1) - 1) 27855c04de5SPatil, Rachna */ 2798c896308SSebastian Andrzej Siewior z = z1 - z2; 28055c04de5SPatil, Rachna z *= x; 28155c04de5SPatil, Rachna z *= ts_dev->x_plate_resistance; 2828c896308SSebastian Andrzej Siewior z /= z2; 28355c04de5SPatil, Rachna z = (z + 2047) >> 12; 28455c04de5SPatil, Rachna 28555c04de5SPatil, Rachna if (z <= MAX_12BIT) { 28655c04de5SPatil, Rachna input_report_abs(input_dev, ABS_X, x); 28755c04de5SPatil, Rachna input_report_abs(input_dev, ABS_Y, y); 28855c04de5SPatil, Rachna input_report_abs(input_dev, ABS_PRESSURE, z); 28955c04de5SPatil, Rachna input_report_key(input_dev, BTN_TOUCH, 1); 29055c04de5SPatil, Rachna input_sync(input_dev); 29155c04de5SPatil, Rachna } 29255c04de5SPatil, Rachna } 29355c04de5SPatil, Rachna irqclr |= IRQENB_FIFO0THRES; 29455c04de5SPatil, Rachna } 29555c04de5SPatil, Rachna 29655c04de5SPatil, Rachna /* 29755c04de5SPatil, Rachna * Time for sequencer to settle, to read 29855c04de5SPatil, Rachna * correct state of the sequencer. 29955c04de5SPatil, Rachna */ 30055c04de5SPatil, Rachna udelay(SEQ_SETTLE); 30155c04de5SPatil, Rachna 30255c04de5SPatil, Rachna status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); 30355c04de5SPatil, Rachna if (status & IRQENB_PENUP) { 30455c04de5SPatil, Rachna /* Pen up event */ 30555c04de5SPatil, Rachna fsm = titsc_readl(ts_dev, REG_ADCFSM); 30655c04de5SPatil, Rachna if (fsm == ADCFSM_STEPID) { 30755c04de5SPatil, Rachna ts_dev->pen_down = false; 30855c04de5SPatil, Rachna input_report_key(input_dev, BTN_TOUCH, 0); 30955c04de5SPatil, Rachna input_report_abs(input_dev, ABS_PRESSURE, 0); 31055c04de5SPatil, Rachna input_sync(input_dev); 31155c04de5SPatil, Rachna } else { 31255c04de5SPatil, Rachna ts_dev->pen_down = true; 31355c04de5SPatil, Rachna } 31455c04de5SPatil, Rachna irqclr |= IRQENB_PENUP; 31555c04de5SPatil, Rachna } 31655c04de5SPatil, Rachna 31700789e5dSSebastian Andrzej Siewior if (status & IRQENB_HW_PEN) { 31855c04de5SPatil, Rachna 31900789e5dSSebastian Andrzej Siewior titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00); 32000789e5dSSebastian Andrzej Siewior titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); 32100789e5dSSebastian Andrzej Siewior } 32200789e5dSSebastian Andrzej Siewior 3239a28b883SSebastian Andrzej Siewior if (irqclr) { 32455c04de5SPatil, Rachna titsc_writel(ts_dev, REG_IRQSTATUS, irqclr); 325*baee5399SZubair Lutfullah am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask); 32655c04de5SPatil, Rachna return IRQ_HANDLED; 32755c04de5SPatil, Rachna } 3289a28b883SSebastian Andrzej Siewior return IRQ_NONE; 3299a28b883SSebastian Andrzej Siewior } 33055c04de5SPatil, Rachna 3310396310bSPatil, Rachna static int titsc_parse_dt(struct platform_device *pdev, 3320396310bSPatil, Rachna struct titsc *ts_dev) 3330396310bSPatil, Rachna { 3340396310bSPatil, Rachna struct device_node *node = pdev->dev.of_node; 3350396310bSPatil, Rachna int err; 3360396310bSPatil, Rachna 3370396310bSPatil, Rachna if (!node) 3380396310bSPatil, Rachna return -EINVAL; 3390396310bSPatil, Rachna 3400396310bSPatil, Rachna err = of_property_read_u32(node, "ti,wires", &ts_dev->wires); 3410396310bSPatil, Rachna if (err < 0) 3420396310bSPatil, Rachna return err; 3430396310bSPatil, Rachna switch (ts_dev->wires) { 3440396310bSPatil, Rachna case 4: 3450396310bSPatil, Rachna case 5: 3460396310bSPatil, Rachna case 8: 3470396310bSPatil, Rachna break; 3480396310bSPatil, Rachna default: 3490396310bSPatil, Rachna return -EINVAL; 3500396310bSPatil, Rachna } 3510396310bSPatil, Rachna 3520396310bSPatil, Rachna err = of_property_read_u32(node, "ti,x-plate-resistance", 3530396310bSPatil, Rachna &ts_dev->x_plate_resistance); 3540396310bSPatil, Rachna if (err < 0) 3550396310bSPatil, Rachna return err; 3560396310bSPatil, Rachna 3570396310bSPatil, Rachna err = of_property_read_u32(node, "ti,coordiante-readouts", 3580396310bSPatil, Rachna &ts_dev->coordinate_readouts); 3590396310bSPatil, Rachna if (err < 0) 3600396310bSPatil, Rachna return err; 3610396310bSPatil, Rachna 3620396310bSPatil, Rachna return of_property_read_u32_array(node, "ti,wire-config", 3630396310bSPatil, Rachna ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp)); 3640396310bSPatil, Rachna } 36555c04de5SPatil, Rachna 36655c04de5SPatil, Rachna /* 36755c04de5SPatil, Rachna * The functions for inserting/removing driver as a module. 36855c04de5SPatil, Rachna */ 36955c04de5SPatil, Rachna 37031564cbdSLinus Torvalds static int titsc_probe(struct platform_device *pdev) 37155c04de5SPatil, Rachna { 37255c04de5SPatil, Rachna struct titsc *ts_dev; 37355c04de5SPatil, Rachna struct input_dev *input_dev; 374a9bce1b0SSebastian Andrzej Siewior struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev); 37555c04de5SPatil, Rachna int err; 3762b99bafaSPatil, Rachna 37755c04de5SPatil, Rachna /* Allocate memory for device */ 37855c04de5SPatil, Rachna ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL); 37955c04de5SPatil, Rachna input_dev = input_allocate_device(); 38055c04de5SPatil, Rachna if (!ts_dev || !input_dev) { 38155c04de5SPatil, Rachna dev_err(&pdev->dev, "failed to allocate memory.\n"); 38255c04de5SPatil, Rachna err = -ENOMEM; 38355c04de5SPatil, Rachna goto err_free_mem; 38455c04de5SPatil, Rachna } 38555c04de5SPatil, Rachna 3862b99bafaSPatil, Rachna tscadc_dev->tsc = ts_dev; 3872b99bafaSPatil, Rachna ts_dev->mfd_tscadc = tscadc_dev; 38855c04de5SPatil, Rachna ts_dev->input = input_dev; 3892b99bafaSPatil, Rachna ts_dev->irq = tscadc_dev->irq; 3900396310bSPatil, Rachna 3910396310bSPatil, Rachna err = titsc_parse_dt(pdev, ts_dev); 3920396310bSPatil, Rachna if (err) { 3930396310bSPatil, Rachna dev_err(&pdev->dev, "Could not find valid DT data.\n"); 3940396310bSPatil, Rachna goto err_free_mem; 3950396310bSPatil, Rachna } 39655c04de5SPatil, Rachna 39755c04de5SPatil, Rachna err = request_irq(ts_dev->irq, titsc_irq, 398*baee5399SZubair Lutfullah IRQF_SHARED, pdev->dev.driver->name, ts_dev); 39955c04de5SPatil, Rachna if (err) { 40055c04de5SPatil, Rachna dev_err(&pdev->dev, "failed to allocate irq.\n"); 4012b99bafaSPatil, Rachna goto err_free_mem; 40255c04de5SPatil, Rachna } 40355c04de5SPatil, Rachna 40455c04de5SPatil, Rachna titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES); 405bb76dc09SPatil, Rachna err = titsc_config_wires(ts_dev); 406bb76dc09SPatil, Rachna if (err) { 407bb76dc09SPatil, Rachna dev_err(&pdev->dev, "wrong i/p wire configuration\n"); 408bb76dc09SPatil, Rachna goto err_free_irq; 409bb76dc09SPatil, Rachna } 41055c04de5SPatil, Rachna titsc_step_config(ts_dev); 4118c896308SSebastian Andrzej Siewior titsc_writel(ts_dev, REG_FIFO0THR, 4128c896308SSebastian Andrzej Siewior ts_dev->coordinate_readouts * 2 + 2 - 1); 41355c04de5SPatil, Rachna 4142b99bafaSPatil, Rachna input_dev->name = "ti-tsc"; 41555c04de5SPatil, Rachna input_dev->dev.parent = &pdev->dev; 41655c04de5SPatil, Rachna 41755c04de5SPatil, Rachna input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 41855c04de5SPatil, Rachna input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 41955c04de5SPatil, Rachna 42055c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); 42155c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); 42255c04de5SPatil, Rachna input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); 42355c04de5SPatil, Rachna 42455c04de5SPatil, Rachna /* register to the input system */ 42555c04de5SPatil, Rachna err = input_register_device(input_dev); 42655c04de5SPatil, Rachna if (err) 4272b99bafaSPatil, Rachna goto err_free_irq; 42855c04de5SPatil, Rachna 42955c04de5SPatil, Rachna platform_set_drvdata(pdev, ts_dev); 43055c04de5SPatil, Rachna return 0; 43155c04de5SPatil, Rachna 43255c04de5SPatil, Rachna err_free_irq: 43355c04de5SPatil, Rachna free_irq(ts_dev->irq, ts_dev); 43455c04de5SPatil, Rachna err_free_mem: 43555c04de5SPatil, Rachna input_free_device(input_dev); 43655c04de5SPatil, Rachna kfree(ts_dev); 43755c04de5SPatil, Rachna return err; 43855c04de5SPatil, Rachna } 43955c04de5SPatil, Rachna 44031564cbdSLinus Torvalds static int titsc_remove(struct platform_device *pdev) 44155c04de5SPatil, Rachna { 442a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = platform_get_drvdata(pdev); 443a9bce1b0SSebastian Andrzej Siewior u32 steps; 44455c04de5SPatil, Rachna 44555c04de5SPatil, Rachna free_irq(ts_dev->irq, ts_dev); 44655c04de5SPatil, Rachna 447abeccee4SPatil, Rachna /* total steps followed by the enable mask */ 4480396310bSPatil, Rachna steps = 2 * ts_dev->coordinate_readouts + 2; 449abeccee4SPatil, Rachna steps = (1 << steps) - 1; 450abeccee4SPatil, Rachna am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps); 451abeccee4SPatil, Rachna 45255c04de5SPatil, Rachna input_unregister_device(ts_dev->input); 45355c04de5SPatil, Rachna 4542b99bafaSPatil, Rachna kfree(ts_dev); 45555c04de5SPatil, Rachna return 0; 45655c04de5SPatil, Rachna } 45755c04de5SPatil, Rachna 4582b99bafaSPatil, Rachna #ifdef CONFIG_PM 4592b99bafaSPatil, Rachna static int titsc_suspend(struct device *dev) 4602b99bafaSPatil, Rachna { 461a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = dev_get_drvdata(dev); 462a9bce1b0SSebastian Andrzej Siewior struct ti_tscadc_dev *tscadc_dev; 4632b99bafaSPatil, Rachna unsigned int idle; 4642b99bafaSPatil, Rachna 465a9bce1b0SSebastian Andrzej Siewior tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); 4662b99bafaSPatil, Rachna if (device_may_wakeup(tscadc_dev->dev)) { 4672b99bafaSPatil, Rachna idle = titsc_readl(ts_dev, REG_IRQENABLE); 4682b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQENABLE, 4692b99bafaSPatil, Rachna (idle | IRQENB_HW_PEN)); 4702b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); 4712b99bafaSPatil, Rachna } 4722b99bafaSPatil, Rachna return 0; 4732b99bafaSPatil, Rachna } 4742b99bafaSPatil, Rachna 4752b99bafaSPatil, Rachna static int titsc_resume(struct device *dev) 4762b99bafaSPatil, Rachna { 477a9bce1b0SSebastian Andrzej Siewior struct titsc *ts_dev = dev_get_drvdata(dev); 478a9bce1b0SSebastian Andrzej Siewior struct ti_tscadc_dev *tscadc_dev; 4792b99bafaSPatil, Rachna 480a9bce1b0SSebastian Andrzej Siewior tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); 4812b99bafaSPatil, Rachna if (device_may_wakeup(tscadc_dev->dev)) { 4822b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQWAKEUP, 4832b99bafaSPatil, Rachna 0x00); 4842b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); 4852b99bafaSPatil, Rachna } 4862b99bafaSPatil, Rachna titsc_step_config(ts_dev); 4872b99bafaSPatil, Rachna titsc_writel(ts_dev, REG_FIFO0THR, 4888c896308SSebastian Andrzej Siewior ts_dev->coordinate_readouts * 2 + 2 - 1); 4892b99bafaSPatil, Rachna return 0; 4902b99bafaSPatil, Rachna } 4912b99bafaSPatil, Rachna 4922b99bafaSPatil, Rachna static const struct dev_pm_ops titsc_pm_ops = { 4932b99bafaSPatil, Rachna .suspend = titsc_suspend, 4942b99bafaSPatil, Rachna .resume = titsc_resume, 4952b99bafaSPatil, Rachna }; 4962b99bafaSPatil, Rachna #define TITSC_PM_OPS (&titsc_pm_ops) 4972b99bafaSPatil, Rachna #else 4982b99bafaSPatil, Rachna #define TITSC_PM_OPS NULL 4992b99bafaSPatil, Rachna #endif 5002b99bafaSPatil, Rachna 5010396310bSPatil, Rachna static const struct of_device_id ti_tsc_dt_ids[] = { 5020396310bSPatil, Rachna { .compatible = "ti,am3359-tsc", }, 5030396310bSPatil, Rachna { } 5040396310bSPatil, Rachna }; 5050396310bSPatil, Rachna MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids); 5060396310bSPatil, Rachna 50755c04de5SPatil, Rachna static struct platform_driver ti_tsc_driver = { 50855c04de5SPatil, Rachna .probe = titsc_probe, 50931564cbdSLinus Torvalds .remove = titsc_remove, 51055c04de5SPatil, Rachna .driver = { 5115f184e63SSebastian Andrzej Siewior .name = "TI-am335x-tsc", 51255c04de5SPatil, Rachna .owner = THIS_MODULE, 5132b99bafaSPatil, Rachna .pm = TITSC_PM_OPS, 5140396310bSPatil, Rachna .of_match_table = of_match_ptr(ti_tsc_dt_ids), 51555c04de5SPatil, Rachna }, 51655c04de5SPatil, Rachna }; 51755c04de5SPatil, Rachna module_platform_driver(ti_tsc_driver); 51855c04de5SPatil, Rachna 51955c04de5SPatil, Rachna MODULE_DESCRIPTION("TI touchscreen controller driver"); 52055c04de5SPatil, Rachna MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); 52155c04de5SPatil, Rachna MODULE_LICENSE("GPL"); 522