Commit | Line | Data |
---|---|---|
1b8be32e RP |
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 | ||
1b8be32e RP |
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> | |
1b8be32e | 26 | #include <linux/delay.h> |
0396310b PR |
27 | #include <linux/of.h> |
28 | #include <linux/of_device.h> | |
83edfdf3 | 29 | #include <linux/sort.h> |
1b8be32e | 30 | |
2b99bafa | 31 | #include <linux/mfd/ti_am335x_tscadc.h> |
33f5cc60 PR |
32 | |
33 | #define ADCFSM_STEPID 0x10 | |
1b8be32e | 34 | #define SEQ_SETTLE 275 |
1b8be32e | 35 | #define MAX_12BIT ((1 << 12) - 1) |
1b8be32e | 36 | |
bb76dc09 PR |
37 | static const int config_pins[] = { |
38 | STEPCONFIG_XPP, | |
39 | STEPCONFIG_XNN, | |
40 | STEPCONFIG_YPP, | |
41 | STEPCONFIG_YNN, | |
42 | }; | |
43 | ||
55c04de5 | 44 | struct titsc { |
1b8be32e | 45 | struct input_dev *input; |
2b99bafa | 46 | struct ti_tscadc_dev *mfd_tscadc; |
1b8be32e RP |
47 | unsigned int irq; |
48 | unsigned int wires; | |
49 | unsigned int x_plate_resistance; | |
50 | bool pen_down; | |
0396310b | 51 | int coordinate_readouts; |
bb76dc09 PR |
52 | u32 config_inp[4]; |
53 | u32 bit_xp, bit_xn, bit_yp, bit_yn; | |
54 | u32 inp_xp, inp_xn, inp_yp, inp_yn; | |
baee5399 | 55 | u32 step_mask; |
bf223612 | 56 | u32 charge_delay; |
1b8be32e RP |
57 | }; |
58 | ||
55c04de5 | 59 | static unsigned int titsc_readl(struct titsc *ts, unsigned int reg) |
1b8be32e | 60 | { |
2b99bafa | 61 | return readl(ts->mfd_tscadc->tscadc_base + reg); |
1b8be32e RP |
62 | } |
63 | ||
55c04de5 | 64 | static void titsc_writel(struct titsc *tsc, unsigned int reg, |
1b8be32e RP |
65 | unsigned int val) |
66 | { | |
2b99bafa | 67 | writel(val, tsc->mfd_tscadc->tscadc_base + reg); |
1b8be32e RP |
68 | } |
69 | ||
bb76dc09 PR |
70 | static int titsc_config_wires(struct titsc *ts_dev) |
71 | { | |
72 | u32 analog_line[4]; | |
73 | u32 wire_order[4]; | |
74 | int i, bit_cfg; | |
75 | ||
76 | for (i = 0; i < 4; i++) { | |
77 | /* | |
78 | * Get the order in which TSC wires are attached | |
79 | * w.r.t. each of the analog input lines on the EVM. | |
80 | */ | |
81 | analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4; | |
82 | wire_order[i] = ts_dev->config_inp[i] & 0x0F; | |
83 | if (WARN_ON(analog_line[i] > 7)) | |
84 | return -EINVAL; | |
85 | if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins))) | |
86 | return -EINVAL; | |
87 | } | |
88 | ||
89 | for (i = 0; i < 4; i++) { | |
90 | int an_line; | |
91 | int wi_order; | |
92 | ||
93 | an_line = analog_line[i]; | |
94 | wi_order = wire_order[i]; | |
95 | bit_cfg = config_pins[wi_order]; | |
96 | if (bit_cfg == 0) | |
97 | return -EINVAL; | |
98 | switch (wi_order) { | |
99 | case 0: | |
100 | ts_dev->bit_xp = bit_cfg; | |
101 | ts_dev->inp_xp = an_line; | |
102 | break; | |
103 | ||
104 | case 1: | |
105 | ts_dev->bit_xn = bit_cfg; | |
106 | ts_dev->inp_xn = an_line; | |
107 | break; | |
108 | ||
109 | case 2: | |
110 | ts_dev->bit_yp = bit_cfg; | |
111 | ts_dev->inp_yp = an_line; | |
112 | break; | |
113 | case 3: | |
114 | ts_dev->bit_yn = bit_cfg; | |
115 | ts_dev->inp_yn = an_line; | |
116 | break; | |
117 | } | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
55c04de5 | 122 | static void titsc_step_config(struct titsc *ts_dev) |
1b8be32e RP |
123 | { |
124 | unsigned int config; | |
8c896308 | 125 | int i; |
3a59684c | 126 | int end_step, first_step, tsc_steps; |
8c896308 | 127 | u32 stepenable; |
1b8be32e RP |
128 | |
129 | config = STEPCONFIG_MODE_HWSYNC | | |
bb76dc09 | 130 | STEPCONFIG_AVG_16 | ts_dev->bit_xp; |
1b8be32e RP |
131 | switch (ts_dev->wires) { |
132 | case 4: | |
bb76dc09 | 133 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
1b8be32e RP |
134 | break; |
135 | case 5: | |
bb76dc09 PR |
136 | config |= ts_dev->bit_yn | |
137 | STEPCONFIG_INP_AN4 | ts_dev->bit_xn | | |
138 | ts_dev->bit_yp; | |
1b8be32e RP |
139 | break; |
140 | case 8: | |
bb76dc09 | 141 | config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn; |
1b8be32e RP |
142 | break; |
143 | } | |
144 | ||
3a59684c BG |
145 | tsc_steps = ts_dev->coordinate_readouts * 2 + 2; |
146 | first_step = TOTAL_STEPS - tsc_steps; | |
147 | /* Steps 16 to 16-coordinate_readouts is for X */ | |
148 | end_step = first_step + tsc_steps; | |
149 | for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) { | |
55c04de5 PR |
150 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
151 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); | |
1b8be32e RP |
152 | } |
153 | ||
154 | config = 0; | |
155 | config = STEPCONFIG_MODE_HWSYNC | | |
bb76dc09 | 156 | STEPCONFIG_AVG_16 | ts_dev->bit_yn | |
8c896308 | 157 | STEPCONFIG_INM_ADCREFM; |
1b8be32e RP |
158 | switch (ts_dev->wires) { |
159 | case 4: | |
bb76dc09 | 160 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
1b8be32e RP |
161 | break; |
162 | case 5: | |
bb76dc09 PR |
163 | config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 | |
164 | ts_dev->bit_xn | ts_dev->bit_yp; | |
1b8be32e RP |
165 | break; |
166 | case 8: | |
bb76dc09 | 167 | config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); |
1b8be32e RP |
168 | break; |
169 | } | |
170 | ||
3a59684c BG |
171 | /* 1 ... coordinate_readouts is for Y */ |
172 | end_step = first_step + ts_dev->coordinate_readouts; | |
173 | for (i = first_step; i < end_step; i++) { | |
55c04de5 PR |
174 | titsc_writel(ts_dev, REG_STEPCONFIG(i), config); |
175 | titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); | |
1b8be32e RP |
176 | } |
177 | ||
344d635b | 178 | /* Make CHARGECONFIG same as IDLECONFIG */ |
1b8be32e | 179 | |
344d635b | 180 | config = titsc_readl(ts_dev, REG_IDLECONFIG); |
55c04de5 | 181 | titsc_writel(ts_dev, REG_CHARGECONFIG, config); |
bf223612 | 182 | titsc_writel(ts_dev, REG_CHARGEDELAY, ts_dev->charge_delay); |
1b8be32e | 183 | |
3a59684c | 184 | /* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */ |
1b8be32e | 185 | config = STEPCONFIG_MODE_HWSYNC | |
bb76dc09 PR |
186 | STEPCONFIG_AVG_16 | ts_dev->bit_yp | |
187 | ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | | |
188 | STEPCONFIG_INP(ts_dev->inp_xp); | |
8c896308 SAS |
189 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); |
190 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), | |
d1fb5743 | 191 | STEPCONFIG_OPENDLY); |
1b8be32e | 192 | |
8c896308 SAS |
193 | end_step++; |
194 | config |= STEPCONFIG_INP(ts_dev->inp_yn); | |
195 | titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); | |
196 | titsc_writel(ts_dev, REG_STEPDELAY(end_step), | |
d1fb5743 | 197 | STEPCONFIG_OPENDLY); |
1b8be32e | 198 | |
3a59684c BG |
199 | /* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */ |
200 | stepenable = 1; | |
201 | for (i = 0; i < tsc_steps; i++) | |
202 | stepenable |= 1 << (first_step + i + 1); | |
203 | ||
baee5399 | 204 | ts_dev->step_mask = stepenable; |
7e170c6e | 205 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); |
1b8be32e RP |
206 | } |
207 | ||
83edfdf3 V |
208 | static int titsc_cmp_coord(const void *a, const void *b) |
209 | { | |
210 | return *(int *)a - *(int *)b; | |
211 | } | |
212 | ||
55c04de5 | 213 | static void titsc_read_coordinates(struct titsc *ts_dev, |
8c896308 | 214 | u32 *x, u32 *y, u32 *z1, u32 *z2) |
1b8be32e | 215 | { |
83edfdf3 V |
216 | unsigned int yvals[7], xvals[7]; |
217 | unsigned int i, xsum = 0, ysum = 0; | |
8c896308 | 218 | unsigned int creads = ts_dev->coordinate_readouts; |
1b8be32e | 219 | |
83edfdf3 V |
220 | for (i = 0; i < creads; i++) { |
221 | yvals[i] = titsc_readl(ts_dev, REG_FIFO0); | |
222 | yvals[i] &= 0xfff; | |
223 | } | |
1b8be32e | 224 | |
83edfdf3 V |
225 | *z1 = titsc_readl(ts_dev, REG_FIFO0); |
226 | *z1 &= 0xfff; | |
227 | *z2 = titsc_readl(ts_dev, REG_FIFO0); | |
228 | *z2 &= 0xfff; | |
3a59684c | 229 | |
83edfdf3 V |
230 | for (i = 0; i < creads; i++) { |
231 | xvals[i] = titsc_readl(ts_dev, REG_FIFO0); | |
232 | xvals[i] &= 0xfff; | |
233 | } | |
3a59684c | 234 | |
83edfdf3 V |
235 | /* |
236 | * If co-ordinates readouts is less than 4 then | |
237 | * report the average. In case of 4 or more | |
238 | * readouts, sort the co-ordinate samples, drop | |
239 | * min and max values and report the average of | |
240 | * remaining values. | |
241 | */ | |
242 | if (creads <= 3) { | |
243 | for (i = 0; i < creads; i++) { | |
244 | ysum += yvals[i]; | |
245 | xsum += xvals[i]; | |
1b8be32e | 246 | } |
83edfdf3 V |
247 | ysum /= creads; |
248 | xsum /= creads; | |
249 | } else { | |
250 | sort(yvals, creads, sizeof(unsigned int), | |
251 | titsc_cmp_coord, NULL); | |
252 | sort(xvals, creads, sizeof(unsigned int), | |
253 | titsc_cmp_coord, NULL); | |
254 | for (i = 1; i < creads - 1; i++) { | |
255 | ysum += yvals[i]; | |
256 | xsum += xvals[i]; | |
257 | } | |
258 | ysum /= creads - 2; | |
259 | xsum /= creads - 2; | |
1b8be32e | 260 | } |
83edfdf3 V |
261 | *y = ysum; |
262 | *x = xsum; | |
1b8be32e RP |
263 | } |
264 | ||
55c04de5 | 265 | static irqreturn_t titsc_irq(int irq, void *dev) |
1b8be32e | 266 | { |
55c04de5 | 267 | struct titsc *ts_dev = dev; |
1b8be32e | 268 | struct input_dev *input_dev = ts_dev->input; |
344d635b | 269 | unsigned int fsm, status, irqclr = 0; |
1b8be32e RP |
270 | unsigned int x = 0, y = 0; |
271 | unsigned int z1, z2, z; | |
1b8be32e | 272 | |
344d635b BG |
273 | status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); |
274 | if (status & IRQENB_HW_PEN) { | |
275 | ts_dev->pen_down = true; | |
344d635b BG |
276 | irqclr |= IRQENB_HW_PEN; |
277 | } | |
278 | ||
279 | if (status & IRQENB_PENUP) { | |
280 | fsm = titsc_readl(ts_dev, REG_ADCFSM); | |
281 | if (fsm == ADCFSM_STEPID) { | |
282 | ts_dev->pen_down = false; | |
283 | input_report_key(input_dev, BTN_TOUCH, 0); | |
284 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
285 | input_sync(input_dev); | |
286 | } else { | |
287 | ts_dev->pen_down = true; | |
288 | } | |
289 | irqclr |= IRQENB_PENUP; | |
290 | } | |
291 | ||
292 | if (status & IRQENB_EOS) | |
293 | irqclr |= IRQENB_EOS; | |
294 | ||
baee5399 ZL |
295 | /* |
296 | * ADC and touchscreen share the IRQ line. | |
297 | * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only | |
298 | */ | |
30af55f9 | 299 | if (status & IRQENB_FIFO0THRES) { |
1b8be32e | 300 | |
8c896308 | 301 | titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2); |
2b99bafa | 302 | |
1b8be32e RP |
303 | if (ts_dev->pen_down && z1 != 0 && z2 != 0) { |
304 | /* | |
305 | * Calculate pressure using formula | |
306 | * Resistance(touch) = x plate resistance * | |
307 | * x postion/4096 * ((z2 / z1) - 1) | |
308 | */ | |
8c896308 | 309 | z = z1 - z2; |
1b8be32e RP |
310 | z *= x; |
311 | z *= ts_dev->x_plate_resistance; | |
8c896308 | 312 | z /= z2; |
1b8be32e RP |
313 | z = (z + 2047) >> 12; |
314 | ||
315 | if (z <= MAX_12BIT) { | |
316 | input_report_abs(input_dev, ABS_X, x); | |
317 | input_report_abs(input_dev, ABS_Y, y); | |
318 | input_report_abs(input_dev, ABS_PRESSURE, z); | |
319 | input_report_key(input_dev, BTN_TOUCH, 1); | |
320 | input_sync(input_dev); | |
321 | } | |
322 | } | |
30af55f9 | 323 | irqclr |= IRQENB_FIFO0THRES; |
1b8be32e | 324 | } |
9a28b883 SAS |
325 | if (irqclr) { |
326 | titsc_writel(ts_dev, REG_IRQSTATUS, irqclr); | |
344d635b BG |
327 | if (status & IRQENB_EOS) |
328 | am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, | |
329 | ts_dev->step_mask); | |
9a28b883 SAS |
330 | return IRQ_HANDLED; |
331 | } | |
332 | return IRQ_NONE; | |
1b8be32e RP |
333 | } |
334 | ||
0396310b PR |
335 | static int titsc_parse_dt(struct platform_device *pdev, |
336 | struct titsc *ts_dev) | |
337 | { | |
338 | struct device_node *node = pdev->dev.of_node; | |
339 | int err; | |
340 | ||
341 | if (!node) | |
342 | return -EINVAL; | |
343 | ||
344 | err = of_property_read_u32(node, "ti,wires", &ts_dev->wires); | |
345 | if (err < 0) | |
346 | return err; | |
347 | switch (ts_dev->wires) { | |
348 | case 4: | |
349 | case 5: | |
350 | case 8: | |
351 | break; | |
352 | default: | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
356 | err = of_property_read_u32(node, "ti,x-plate-resistance", | |
357 | &ts_dev->x_plate_resistance); | |
358 | if (err < 0) | |
359 | return err; | |
360 | ||
c9aeb249 FB |
361 | /* |
362 | * Try with the new binding first. If it fails, try again with | |
363 | * bogus, miss-spelled version. | |
364 | */ | |
365 | err = of_property_read_u32(node, "ti,coordinate-readouts", | |
0396310b | 366 | &ts_dev->coordinate_readouts); |
31972f6e FB |
367 | if (err < 0) { |
368 | dev_warn(&pdev->dev, "please use 'ti,coordinate-readouts' instead\n"); | |
c9aeb249 FB |
369 | err = of_property_read_u32(node, "ti,coordiante-readouts", |
370 | &ts_dev->coordinate_readouts); | |
31972f6e FB |
371 | } |
372 | ||
0396310b PR |
373 | if (err < 0) |
374 | return err; | |
375 | ||
83edfdf3 V |
376 | if (ts_dev->coordinate_readouts <= 0) { |
377 | dev_warn(&pdev->dev, | |
378 | "invalid co-ordinate readouts, resetting it to 5\n"); | |
379 | ts_dev->coordinate_readouts = 5; | |
380 | } | |
381 | ||
bf223612 V |
382 | err = of_property_read_u32(node, "ti,charge-delay", |
383 | &ts_dev->charge_delay); | |
384 | /* | |
385 | * If ti,charge-delay value is not specified, then use | |
386 | * CHARGEDLY_OPENDLY as the default value. | |
387 | */ | |
388 | if (err < 0) { | |
389 | ts_dev->charge_delay = CHARGEDLY_OPENDLY; | |
390 | dev_warn(&pdev->dev, "ti,charge-delay not specified\n"); | |
391 | } | |
392 | ||
0396310b PR |
393 | return of_property_read_u32_array(node, "ti,wire-config", |
394 | ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp)); | |
1b8be32e RP |
395 | } |
396 | ||
397 | /* | |
398 | * The functions for inserting/removing driver as a module. | |
399 | */ | |
400 | ||
31564cbd | 401 | static int titsc_probe(struct platform_device *pdev) |
1b8be32e | 402 | { |
55c04de5 | 403 | struct titsc *ts_dev; |
1b8be32e | 404 | struct input_dev *input_dev; |
a9bce1b0 | 405 | struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev); |
1b8be32e | 406 | int err; |
1b8be32e | 407 | |
1b8be32e | 408 | /* Allocate memory for device */ |
55c04de5 | 409 | ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL); |
1b8be32e RP |
410 | input_dev = input_allocate_device(); |
411 | if (!ts_dev || !input_dev) { | |
412 | dev_err(&pdev->dev, "failed to allocate memory.\n"); | |
413 | err = -ENOMEM; | |
414 | goto err_free_mem; | |
415 | } | |
416 | ||
2b99bafa PR |
417 | tscadc_dev->tsc = ts_dev; |
418 | ts_dev->mfd_tscadc = tscadc_dev; | |
1b8be32e | 419 | ts_dev->input = input_dev; |
2b99bafa | 420 | ts_dev->irq = tscadc_dev->irq; |
0396310b | 421 | |
b9194fdf | 422 | err = titsc_parse_dt(pdev, ts_dev); |
0396310b PR |
423 | if (err) { |
424 | dev_err(&pdev->dev, "Could not find valid DT data.\n"); | |
425 | goto err_free_mem; | |
426 | } | |
1b8be32e | 427 | |
55c04de5 | 428 | err = request_irq(ts_dev->irq, titsc_irq, |
baee5399 | 429 | IRQF_SHARED, pdev->dev.driver->name, ts_dev); |
1b8be32e RP |
430 | if (err) { |
431 | dev_err(&pdev->dev, "failed to allocate irq.\n"); | |
2b99bafa | 432 | goto err_free_mem; |
1b8be32e | 433 | } |
1b8be32e | 434 | |
55c04de5 | 435 | titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES); |
344d635b | 436 | titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS); |
bb76dc09 PR |
437 | err = titsc_config_wires(ts_dev); |
438 | if (err) { | |
439 | dev_err(&pdev->dev, "wrong i/p wire configuration\n"); | |
440 | goto err_free_irq; | |
441 | } | |
55c04de5 | 442 | titsc_step_config(ts_dev); |
8c896308 SAS |
443 | titsc_writel(ts_dev, REG_FIFO0THR, |
444 | ts_dev->coordinate_readouts * 2 + 2 - 1); | |
1b8be32e | 445 | |
2b99bafa | 446 | input_dev->name = "ti-tsc"; |
1b8be32e RP |
447 | input_dev->dev.parent = &pdev->dev; |
448 | ||
449 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
450 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
451 | ||
452 | input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); | |
453 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); | |
454 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); | |
455 | ||
456 | /* register to the input system */ | |
457 | err = input_register_device(input_dev); | |
458 | if (err) | |
2b99bafa | 459 | goto err_free_irq; |
1b8be32e RP |
460 | |
461 | platform_set_drvdata(pdev, ts_dev); | |
462 | return 0; | |
463 | ||
1b8be32e RP |
464 | err_free_irq: |
465 | free_irq(ts_dev->irq, ts_dev); | |
1b8be32e RP |
466 | err_free_mem: |
467 | input_free_device(input_dev); | |
468 | kfree(ts_dev); | |
469 | return err; | |
470 | } | |
471 | ||
31564cbd | 472 | static int titsc_remove(struct platform_device *pdev) |
1b8be32e | 473 | { |
a9bce1b0 SAS |
474 | struct titsc *ts_dev = platform_get_drvdata(pdev); |
475 | u32 steps; | |
1b8be32e RP |
476 | |
477 | free_irq(ts_dev->irq, ts_dev); | |
478 | ||
abeccee4 | 479 | /* total steps followed by the enable mask */ |
0396310b | 480 | steps = 2 * ts_dev->coordinate_readouts + 2; |
abeccee4 PR |
481 | steps = (1 << steps) - 1; |
482 | am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps); | |
483 | ||
1b8be32e RP |
484 | input_unregister_device(ts_dev->input); |
485 | ||
2b99bafa PR |
486 | kfree(ts_dev); |
487 | return 0; | |
488 | } | |
1b8be32e | 489 | |
20aa787e | 490 | static int __maybe_unused titsc_suspend(struct device *dev) |
2b99bafa | 491 | { |
a9bce1b0 SAS |
492 | struct titsc *ts_dev = dev_get_drvdata(dev); |
493 | struct ti_tscadc_dev *tscadc_dev; | |
2b99bafa PR |
494 | unsigned int idle; |
495 | ||
a9bce1b0 | 496 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
2b99bafa PR |
497 | if (device_may_wakeup(tscadc_dev->dev)) { |
498 | idle = titsc_readl(ts_dev, REG_IRQENABLE); | |
499 | titsc_writel(ts_dev, REG_IRQENABLE, | |
500 | (idle | IRQENB_HW_PEN)); | |
501 | titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); | |
502 | } | |
503 | return 0; | |
504 | } | |
1b8be32e | 505 | |
20aa787e | 506 | static int __maybe_unused titsc_resume(struct device *dev) |
2b99bafa | 507 | { |
a9bce1b0 SAS |
508 | struct titsc *ts_dev = dev_get_drvdata(dev); |
509 | struct ti_tscadc_dev *tscadc_dev; | |
1b8be32e | 510 | |
a9bce1b0 | 511 | tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev)); |
2b99bafa PR |
512 | if (device_may_wakeup(tscadc_dev->dev)) { |
513 | titsc_writel(ts_dev, REG_IRQWAKEUP, | |
514 | 0x00); | |
515 | titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); | |
516 | } | |
517 | titsc_step_config(ts_dev); | |
518 | titsc_writel(ts_dev, REG_FIFO0THR, | |
8c896308 | 519 | ts_dev->coordinate_readouts * 2 + 2 - 1); |
1b8be32e RP |
520 | return 0; |
521 | } | |
522 | ||
20aa787e | 523 | static SIMPLE_DEV_PM_OPS(titsc_pm_ops, titsc_suspend, titsc_resume); |
2b99bafa | 524 | |
0396310b PR |
525 | static const struct of_device_id ti_tsc_dt_ids[] = { |
526 | { .compatible = "ti,am3359-tsc", }, | |
527 | { } | |
528 | }; | |
529 | MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids); | |
530 | ||
1b8be32e | 531 | static struct platform_driver ti_tsc_driver = { |
55c04de5 | 532 | .probe = titsc_probe, |
31564cbd | 533 | .remove = titsc_remove, |
1b8be32e | 534 | .driver = { |
5f184e63 | 535 | .name = "TI-am335x-tsc", |
20aa787e | 536 | .pm = &titsc_pm_ops, |
8e6146bf | 537 | .of_match_table = ti_tsc_dt_ids, |
1b8be32e RP |
538 | }, |
539 | }; | |
540 | module_platform_driver(ti_tsc_driver); | |
541 | ||
542 | MODULE_DESCRIPTION("TI touchscreen controller driver"); | |
543 | MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); | |
544 | MODULE_LICENSE("GPL"); |