Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 1 | /* |
| 2 | * TI Touch Screen driver |
| 3 | * |
| 4 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation version 2. |
| 9 | * |
| 10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 11 | * kind, whether express or implied; without even the implied warranty |
| 12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/input.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/io.h> |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 26 | #include <linux/delay.h> |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 27 | #include <linux/of.h> |
| 28 | #include <linux/of_device.h> |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 29 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 30 | #include <linux/mfd/ti_am335x_tscadc.h> |
Patil, Rachna | 33f5cc6 | 2012-10-16 12:55:38 +0530 | [diff] [blame] | 31 | |
| 32 | #define ADCFSM_STEPID 0x10 |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 33 | #define SEQ_SETTLE 275 |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 34 | #define MAX_12BIT ((1 << 12) - 1) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 35 | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 36 | static const int config_pins[] = { |
| 37 | STEPCONFIG_XPP, |
| 38 | STEPCONFIG_XNN, |
| 39 | STEPCONFIG_YPP, |
| 40 | STEPCONFIG_YNN, |
| 41 | }; |
| 42 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 43 | struct titsc { |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 44 | struct input_dev *input; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 45 | struct ti_tscadc_dev *mfd_tscadc; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 46 | unsigned int irq; |
| 47 | unsigned int wires; |
| 48 | unsigned int x_plate_resistance; |
| 49 | bool pen_down; |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 50 | int coordinate_readouts; |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 51 | u32 config_inp[4]; |
| 52 | u32 bit_xp, bit_xn, bit_yp, bit_yn; |
| 53 | u32 inp_xp, inp_xn, inp_yp, inp_yn; |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 54 | u32 step_mask; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 55 | }; |
| 56 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 57 | static unsigned int titsc_readl(struct titsc *ts, unsigned int reg) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 58 | { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 59 | return readl(ts->mfd_tscadc->tscadc_base + reg); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 60 | } |
| 61 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 62 | static void titsc_writel(struct titsc *tsc, unsigned int reg, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 63 | unsigned int val) |
| 64 | { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 65 | writel(val, tsc->mfd_tscadc->tscadc_base + reg); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 66 | } |
| 67 | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 68 | static int titsc_config_wires(struct titsc *ts_dev) |
| 69 | { |
| 70 | u32 analog_line[4]; |
| 71 | u32 wire_order[4]; |
| 72 | int i, bit_cfg; |
| 73 | |
| 74 | for (i = 0; i < 4; i++) { |
| 75 | /* |
| 76 | * Get the order in which TSC wires are attached |
| 77 | * w.r.t. each of the analog input lines on the EVM. |
| 78 | */ |
| 79 | analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4; |
| 80 | wire_order[i] = ts_dev->config_inp[i] & 0x0F; |
| 81 | if (WARN_ON(analog_line[i] > 7)) |
| 82 | return -EINVAL; |
| 83 | if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins))) |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
| 87 | for (i = 0; i < 4; i++) { |
| 88 | int an_line; |
| 89 | int wi_order; |
| 90 | |
| 91 | an_line = analog_line[i]; |
| 92 | wi_order = wire_order[i]; |
| 93 | bit_cfg = config_pins[wi_order]; |
| 94 | if (bit_cfg == 0) |
| 95 | return -EINVAL; |
| 96 | switch (wi_order) { |
| 97 | case 0: |
| 98 | ts_dev->bit_xp = bit_cfg; |
| 99 | ts_dev->inp_xp = an_line; |
| 100 | break; |
| 101 | |
| 102 | case 1: |
| 103 | ts_dev->bit_xn = bit_cfg; |
| 104 | ts_dev->inp_xn = an_line; |
| 105 | break; |
| 106 | |
| 107 | case 2: |
| 108 | ts_dev->bit_yp = bit_cfg; |
| 109 | ts_dev->inp_yp = an_line; |
| 110 | break; |
| 111 | case 3: |
| 112 | ts_dev->bit_yn = bit_cfg; |
| 113 | ts_dev->inp_yn = an_line; |
| 114 | break; |
| 115 | } |
| 116 | } |
| 117 | return 0; |
| 118 | } |
| 119 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 120 | static void titsc_step_config(struct titsc *ts_dev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 121 | { |
| 122 | unsigned int config; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 123 | int i; |
| 124 | int end_step; |
| 125 | u32 stepenable; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 126 | |
| 127 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 128 | STEPCONFIG_AVG_16 | ts_dev->bit_xp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 129 | switch (ts_dev->wires) { |
| 130 | case 4: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 131 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 132 | break; |
| 133 | case 5: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 134 | config |= ts_dev->bit_yn | |
| 135 | STEPCONFIG_INP_AN4 | ts_dev->bit_xn | |
| 136 | ts_dev->bit_yp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 137 | break; |
| 138 | case 8: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 139 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 140 | break; |
| 141 | } |
| 142 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 143 | /* 1 … coordinate_readouts is for X */ |
| 144 | end_step = ts_dev->coordinate_readouts; |
| 145 | for (i = 0; i < end_step; i++) { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 146 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
| 147 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | config = 0; |
| 151 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 152 | STEPCONFIG_AVG_16 | ts_dev->bit_yn | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 153 | STEPCONFIG_INM_ADCREFM; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 154 | switch (ts_dev->wires) { |
| 155 | case 4: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 156 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 157 | break; |
| 158 | case 5: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 159 | config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 | |
| 160 | ts_dev->bit_xn | ts_dev->bit_yp; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 161 | break; |
| 162 | case 8: |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 163 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 164 | break; |
| 165 | } |
| 166 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 167 | /* coordinate_readouts … coordinate_readouts * 2 is for Y */ |
| 168 | end_step = ts_dev->coordinate_readouts * 2; |
| 169 | for (i = ts_dev->coordinate_readouts; i < end_step; i++) { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 170 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
| 171 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 174 | /* Charge step configuration */ |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 175 | config = ts_dev->bit_xp | ts_dev->bit_yn | |
Patil, Rachna | 33f5cc6 | 2012-10-16 12:55:38 +0530 | [diff] [blame] | 176 | STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 177 | STEPCHARGE_INM_AN1 | STEPCHARGE_INP(ts_dev->inp_yp); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 178 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 179 | titsc_writel(ts_dev, REG_CHARGECONFIG, config); |
| 180 | titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 181 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 182 | /* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */ |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 183 | config = STEPCONFIG_MODE_HWSYNC | |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 184 | STEPCONFIG_AVG_16 | ts_dev->bit_yp | |
| 185 | ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | |
| 186 | STEPCONFIG_INP(ts_dev->inp_xp); |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 187 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); |
| 188 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), |
Patil, Rachna | d1fb574 | 2012-10-16 12:55:39 +0530 | [diff] [blame] | 189 | STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 190 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 191 | end_step++; |
| 192 | config |= STEPCONFIG_INP(ts_dev->inp_yn); |
| 193 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); |
| 194 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), |
Patil, Rachna | d1fb574 | 2012-10-16 12:55:39 +0530 | [diff] [blame] | 195 | STEPCONFIG_OPENDLY); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 196 | |
Patil, Rachna | abeccee | 2013-01-24 03:45:05 +0000 | [diff] [blame] | 197 | /* The steps1 … end and bit 0 for TS_Charge */ |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 198 | stepenable = (1 << (end_step + 2)) - 1; |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 199 | ts_dev->step_mask = stepenable; |
Sebastian Andrzej Siewior | 7e170c6 | 2013-12-19 16:28:29 +0100 | [diff] [blame] | 200 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 201 | } |
| 202 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 203 | static void titsc_read_coordinates(struct titsc *ts_dev, |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 204 | u32 *x, u32 *y, u32 *z1, u32 *z2) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 205 | { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 206 | unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 207 | unsigned int prev_val_x = ~0, prev_val_y = ~0; |
| 208 | unsigned int prev_diff_x = ~0, prev_diff_y = ~0; |
| 209 | unsigned int read, diff; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 210 | unsigned int i, channel; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 211 | unsigned int creads = ts_dev->coordinate_readouts; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 212 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 213 | *z1 = *z2 = 0; |
| 214 | if (fifocount % (creads * 2 + 2)) |
| 215 | fifocount -= fifocount % (creads * 2 + 2); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 216 | /* |
| 217 | * Delta filter is used to remove large variations in sampled |
| 218 | * values from ADC. The filter tries to predict where the next |
| 219 | * coordinate could be. This is done by taking a previous |
| 220 | * coordinate and subtracting it form current one. Further the |
| 221 | * algorithm compares the difference with that of a present value, |
| 222 | * if true the value is reported to the sub system. |
| 223 | */ |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 224 | for (i = 0; i < fifocount; i++) { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 225 | read = titsc_readl(ts_dev, REG_FIFO0); |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 226 | |
| 227 | channel = (read & 0xf0000) >> 16; |
| 228 | read &= 0xfff; |
| 229 | if (channel < creads) { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 230 | diff = abs(read - prev_val_x); |
| 231 | if (diff < prev_diff_x) { |
| 232 | prev_diff_x = diff; |
| 233 | *x = read; |
| 234 | } |
| 235 | prev_val_x = read; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 236 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 237 | } else if (channel < creads * 2) { |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 238 | diff = abs(read - prev_val_y); |
| 239 | if (diff < prev_diff_y) { |
| 240 | prev_diff_y = diff; |
| 241 | *y = read; |
| 242 | } |
| 243 | prev_val_y = read; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 244 | |
| 245 | } else if (channel < creads * 2 + 1) { |
| 246 | *z1 = read; |
| 247 | |
| 248 | } else if (channel < creads * 2 + 2) { |
| 249 | *z2 = read; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 250 | } |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 251 | } |
| 252 | } |
| 253 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 254 | static irqreturn_t titsc_irq(int irq, void *dev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 255 | { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 256 | struct titsc *ts_dev = dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 257 | struct input_dev *input_dev = ts_dev->input; |
| 258 | unsigned int status, irqclr = 0; |
| 259 | unsigned int x = 0, y = 0; |
| 260 | unsigned int z1, z2, z; |
| 261 | unsigned int fsm; |
| 262 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 263 | status = titsc_readl(ts_dev, REG_IRQSTATUS); |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 264 | /* |
| 265 | * ADC and touchscreen share the IRQ line. |
| 266 | * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only |
| 267 | */ |
Patil, Rachna | 30af55f | 2012-10-16 12:55:40 +0530 | [diff] [blame] | 268 | if (status & IRQENB_FIFO0THRES) { |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 269 | |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 270 | titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 271 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 272 | if (ts_dev->pen_down && z1 != 0 && z2 != 0) { |
| 273 | /* |
| 274 | * Calculate pressure using formula |
| 275 | * Resistance(touch) = x plate resistance * |
| 276 | * x postion/4096 * ((z2 / z1) - 1) |
| 277 | */ |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 278 | z = z1 - z2; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 279 | z *= x; |
| 280 | z *= ts_dev->x_plate_resistance; |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 281 | z /= z2; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 282 | z = (z + 2047) >> 12; |
| 283 | |
| 284 | if (z <= MAX_12BIT) { |
| 285 | input_report_abs(input_dev, ABS_X, x); |
| 286 | input_report_abs(input_dev, ABS_Y, y); |
| 287 | input_report_abs(input_dev, ABS_PRESSURE, z); |
| 288 | input_report_key(input_dev, BTN_TOUCH, 1); |
| 289 | input_sync(input_dev); |
| 290 | } |
| 291 | } |
Patil, Rachna | 30af55f | 2012-10-16 12:55:40 +0530 | [diff] [blame] | 292 | irqclr |= IRQENB_FIFO0THRES; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Time for sequencer to settle, to read |
| 297 | * correct state of the sequencer. |
| 298 | */ |
| 299 | udelay(SEQ_SETTLE); |
| 300 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 301 | status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 302 | if (status & IRQENB_PENUP) { |
| 303 | /* Pen up event */ |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 304 | fsm = titsc_readl(ts_dev, REG_ADCFSM); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 305 | if (fsm == ADCFSM_STEPID) { |
| 306 | ts_dev->pen_down = false; |
| 307 | input_report_key(input_dev, BTN_TOUCH, 0); |
| 308 | input_report_abs(input_dev, ABS_PRESSURE, 0); |
| 309 | input_sync(input_dev); |
| 310 | } else { |
| 311 | ts_dev->pen_down = true; |
| 312 | } |
| 313 | irqclr |= IRQENB_PENUP; |
| 314 | } |
| 315 | |
Sebastian Andrzej Siewior | 00789e5 | 2013-06-05 16:23:18 +0200 | [diff] [blame] | 316 | if (status & IRQENB_HW_PEN) { |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 317 | |
Sebastian Andrzej Siewior | 00789e5 | 2013-06-05 16:23:18 +0200 | [diff] [blame] | 318 | titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00); |
| 319 | titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); |
| 320 | } |
| 321 | |
Sebastian Andrzej Siewior | 9a28b88 | 2013-06-05 16:30:00 +0200 | [diff] [blame] | 322 | if (irqclr) { |
| 323 | titsc_writel(ts_dev, REG_IRQSTATUS, irqclr); |
Sebastian Andrzej Siewior | 7e170c6 | 2013-12-19 16:28:29 +0100 | [diff] [blame] | 324 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); |
Sebastian Andrzej Siewior | 9a28b88 | 2013-06-05 16:30:00 +0200 | [diff] [blame] | 325 | return IRQ_HANDLED; |
| 326 | } |
| 327 | return IRQ_NONE; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 328 | } |
| 329 | |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 330 | static int titsc_parse_dt(struct platform_device *pdev, |
| 331 | struct titsc *ts_dev) |
| 332 | { |
| 333 | struct device_node *node = pdev->dev.of_node; |
| 334 | int err; |
| 335 | |
| 336 | if (!node) |
| 337 | return -EINVAL; |
| 338 | |
| 339 | err = of_property_read_u32(node, "ti,wires", &ts_dev->wires); |
| 340 | if (err < 0) |
| 341 | return err; |
| 342 | switch (ts_dev->wires) { |
| 343 | case 4: |
| 344 | case 5: |
| 345 | case 8: |
| 346 | break; |
| 347 | default: |
| 348 | return -EINVAL; |
| 349 | } |
| 350 | |
| 351 | err = of_property_read_u32(node, "ti,x-plate-resistance", |
| 352 | &ts_dev->x_plate_resistance); |
| 353 | if (err < 0) |
| 354 | return err; |
| 355 | |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 356 | /* |
| 357 | * Try with the new binding first. If it fails, try again with |
| 358 | * bogus, miss-spelled version. |
| 359 | */ |
| 360 | err = of_property_read_u32(node, "ti,coordinate-readouts", |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 361 | &ts_dev->coordinate_readouts); |
Felipe Balbi | 31972f6 | 2014-06-15 00:15:09 -0700 | [diff] [blame] | 362 | if (err < 0) { |
| 363 | dev_warn(&pdev->dev, "please use 'ti,coordinate-readouts' instead\n"); |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 364 | err = of_property_read_u32(node, "ti,coordiante-readouts", |
| 365 | &ts_dev->coordinate_readouts); |
Felipe Balbi | 31972f6 | 2014-06-15 00:15:09 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Felipe Balbi | c9aeb24 | 2013-11-10 23:56:43 -0800 | [diff] [blame] | 368 | if (err < 0) |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 369 | return err; |
| 370 | |
| 371 | return of_property_read_u32_array(node, "ti,wire-config", |
| 372 | ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp)); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /* |
| 376 | * The functions for inserting/removing driver as a module. |
| 377 | */ |
| 378 | |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 379 | static int titsc_probe(struct platform_device *pdev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 380 | { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 381 | struct titsc *ts_dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 382 | struct input_dev *input_dev; |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 383 | struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 384 | int err; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 385 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 386 | /* Allocate memory for device */ |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 387 | ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 388 | input_dev = input_allocate_device(); |
| 389 | if (!ts_dev || !input_dev) { |
| 390 | dev_err(&pdev->dev, "failed to allocate memory.\n"); |
| 391 | err = -ENOMEM; |
| 392 | goto err_free_mem; |
| 393 | } |
| 394 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 395 | tscadc_dev->tsc = ts_dev; |
| 396 | ts_dev->mfd_tscadc = tscadc_dev; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 397 | ts_dev->input = input_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 398 | ts_dev->irq = tscadc_dev->irq; |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 399 | |
Sebastian Andrzej Siewior | b9194fd | 2013-05-21 17:39:13 +0200 | [diff] [blame] | 400 | err = titsc_parse_dt(pdev, ts_dev); |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 401 | if (err) { |
| 402 | dev_err(&pdev->dev, "Could not find valid DT data.\n"); |
| 403 | goto err_free_mem; |
| 404 | } |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 405 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 406 | err = request_irq(ts_dev->irq, titsc_irq, |
Zubair Lutfullah | baee539 | 2013-09-19 07:24:00 +0100 | [diff] [blame] | 407 | IRQF_SHARED, pdev->dev.driver->name, ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 408 | if (err) { |
| 409 | dev_err(&pdev->dev, "failed to allocate irq.\n"); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 410 | goto err_free_mem; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 411 | } |
| 412 | |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 413 | titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES); |
Patil, Rachna | bb76dc0 | 2013-01-24 03:45:06 +0000 | [diff] [blame] | 414 | err = titsc_config_wires(ts_dev); |
| 415 | if (err) { |
| 416 | dev_err(&pdev->dev, "wrong i/p wire configuration\n"); |
| 417 | goto err_free_irq; |
| 418 | } |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 419 | titsc_step_config(ts_dev); |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 420 | titsc_writel(ts_dev, REG_FIFO0THR, |
| 421 | ts_dev->coordinate_readouts * 2 + 2 - 1); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 422 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 423 | input_dev->name = "ti-tsc"; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 424 | input_dev->dev.parent = &pdev->dev; |
| 425 | |
| 426 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 427 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 428 | |
| 429 | input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); |
| 430 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); |
| 431 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); |
| 432 | |
| 433 | /* register to the input system */ |
| 434 | err = input_register_device(input_dev); |
| 435 | if (err) |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 436 | goto err_free_irq; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 437 | |
| 438 | platform_set_drvdata(pdev, ts_dev); |
| 439 | return 0; |
| 440 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 441 | err_free_irq: |
| 442 | free_irq(ts_dev->irq, ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 443 | err_free_mem: |
| 444 | input_free_device(input_dev); |
| 445 | kfree(ts_dev); |
| 446 | return err; |
| 447 | } |
| 448 | |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 449 | static int titsc_remove(struct platform_device *pdev) |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 450 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 451 | struct titsc *ts_dev = platform_get_drvdata(pdev); |
| 452 | u32 steps; |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 453 | |
| 454 | free_irq(ts_dev->irq, ts_dev); |
| 455 | |
Patil, Rachna | abeccee | 2013-01-24 03:45:05 +0000 | [diff] [blame] | 456 | /* total steps followed by the enable mask */ |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 457 | steps = 2 * ts_dev->coordinate_readouts + 2; |
Patil, Rachna | abeccee | 2013-01-24 03:45:05 +0000 | [diff] [blame] | 458 | steps = (1 << steps) - 1; |
| 459 | am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps); |
| 460 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 461 | input_unregister_device(ts_dev->input); |
| 462 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 463 | kfree(ts_dev); |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 464 | return 0; |
| 465 | } |
| 466 | |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 467 | #ifdef CONFIG_PM |
| 468 | static int titsc_suspend(struct device *dev) |
| 469 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 470 | struct titsc *ts_dev = dev_get_drvdata(dev); |
| 471 | struct ti_tscadc_dev *tscadc_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 472 | unsigned int idle; |
| 473 | |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 474 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 475 | if (device_may_wakeup(tscadc_dev->dev)) { |
| 476 | idle = titsc_readl(ts_dev, REG_IRQENABLE); |
| 477 | titsc_writel(ts_dev, REG_IRQENABLE, |
| 478 | (idle | IRQENB_HW_PEN)); |
| 479 | titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); |
| 480 | } |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | static int titsc_resume(struct device *dev) |
| 485 | { |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 486 | struct titsc *ts_dev = dev_get_drvdata(dev); |
| 487 | struct ti_tscadc_dev *tscadc_dev; |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 488 | |
Sebastian Andrzej Siewior | a9bce1b | 2013-06-05 16:13:47 +0200 | [diff] [blame] | 489 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 490 | if (device_may_wakeup(tscadc_dev->dev)) { |
| 491 | titsc_writel(ts_dev, REG_IRQWAKEUP, |
| 492 | 0x00); |
| 493 | titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); |
| 494 | } |
| 495 | titsc_step_config(ts_dev); |
| 496 | titsc_writel(ts_dev, REG_FIFO0THR, |
Sebastian Andrzej Siewior | 8c89630 | 2013-05-29 14:46:21 +0200 | [diff] [blame] | 497 | ts_dev->coordinate_readouts * 2 + 2 - 1); |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static const struct dev_pm_ops titsc_pm_ops = { |
| 502 | .suspend = titsc_suspend, |
| 503 | .resume = titsc_resume, |
| 504 | }; |
| 505 | #define TITSC_PM_OPS (&titsc_pm_ops) |
| 506 | #else |
| 507 | #define TITSC_PM_OPS NULL |
| 508 | #endif |
| 509 | |
Patil, Rachna | 0396310 | 2013-01-24 03:45:10 +0000 | [diff] [blame] | 510 | static const struct of_device_id ti_tsc_dt_ids[] = { |
| 511 | { .compatible = "ti,am3359-tsc", }, |
| 512 | { } |
| 513 | }; |
| 514 | MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids); |
| 515 | |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 516 | static struct platform_driver ti_tsc_driver = { |
Patil, Rachna | 55c04de | 2012-10-16 12:55:42 +0530 | [diff] [blame] | 517 | .probe = titsc_probe, |
Linus Torvalds | 31564cb | 2012-12-18 12:46:37 -0800 | [diff] [blame] | 518 | .remove = titsc_remove, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 519 | .driver = { |
Sebastian Andrzej Siewior | 5f184e6 | 2013-05-27 17:08:28 +0200 | [diff] [blame] | 520 | .name = "TI-am335x-tsc", |
Patil, Rachna | 2b99baf | 2012-10-16 12:55:44 +0530 | [diff] [blame] | 521 | .pm = TITSC_PM_OPS, |
Sachin Kamat | 8e6146b | 2013-10-06 00:53:52 -0700 | [diff] [blame] | 522 | .of_match_table = ti_tsc_dt_ids, |
Rachna Patil | 1b8be32 | 2012-03-04 08:11:57 -0800 | [diff] [blame] | 523 | }, |
| 524 | }; |
| 525 | module_platform_driver(ti_tsc_driver); |
| 526 | |
| 527 | MODULE_DESCRIPTION("TI touchscreen controller driver"); |
| 528 | MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); |
| 529 | MODULE_LICENSE("GPL"); |