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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/input.h>
16#include <linux/delay.h>
17#include <linux/interrupt.h>
18#include <linux/keyboard.h>
19#include <linux/platform_device.h>
20#include <linux/slab.h>
21#include <linux/of.h>
22#include <asm/irq.h>
23#include <linux/io.h>
24#include <linux/clk.h>
25#include <linux/serio.h>
26
27#define IPROC_TS_NAME "iproc-ts"
28
29#define PEN_DOWN_STATUS 1
30#define PEN_UP_STATUS 0
31
32#define X_MIN 0
33#define Y_MIN 0
34#define X_MAX 0xFFF
35#define Y_MAX 0xFFF
36
37
38#define INVALID_COORD 0xFFFFFFFF
39
40
41#define REGCTL1 0x00
42#define REGCTL2 0x04
43#define INTERRUPT_THRES 0x08
44#define INTERRUPT_MASK 0x0c
45
46#define INTERRUPT_STATUS 0x10
47#define CONTROLLER_STATUS 0x14
48#define FIFO_DATA 0x18
49#define FIFO_DATA_X_Y_MASK 0xFFFF
50#define ANALOG_CONTROL 0x1c
51
52#define AUX_DATA 0x20
53#define DEBOUNCE_CNTR_STAT 0x24
54#define SCAN_CNTR_STAT 0x28
55#define REM_CNTR_STAT 0x2c
56
57#define SETTLING_TIMER_STAT 0x30
58#define SPARE_REG 0x34
59#define SOFT_BYPASS_CONTROL 0x38
60#define SOFT_BYPASS_DATA 0x3c
61
62
63
64#define TS_PEN_INTR_MASK BIT(0)
65#define TS_FIFO_INTR_MASK BIT(2)
66
67
68#define TS_PEN_DOWN BIT(0)
69
70
71#define SCANNING_PERIOD_SHIFT 24
72#define DEBOUNCE_TIMEOUT_SHIFT 16
73#define SETTLING_TIMEOUT_SHIFT 8
74#define TOUCH_TIMEOUT_SHIFT 0
75
76
77#define X_COORD_SHIFT 0
78#define Y_COORD_SHIFT 16
79
80
81#define TS_CONTROLLER_EN_BIT BIT(16)
82#define TS_CONTROLLER_AVGDATA_SHIFT 8
83#define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
84#define TS_CONTROLLER_PWR_LDO BIT(5)
85#define TS_CONTROLLER_PWR_ADC BIT(4)
86#define TS_CONTROLLER_PWR_BGP BIT(3)
87#define TS_CONTROLLER_PWR_TS BIT(2)
88#define TS_WIRE_MODE_BIT BIT(1)
89
90#define dbg_reg(dev, priv, reg) \
91 dev_dbg(dev, "%20s= 0x%08x\n", #reg, readl((priv)->regs + reg))
92
93struct tsc_param {
94
95 u32 scanning_period;
96
97
98 u32 debounce_timeout;
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117 u32 settling_timeout;
118
119
120 u32 touch_timeout;
121
122
123
124
125
126 u32 average_data;
127
128
129 u32 fifo_threshold;
130
131
132 u32 max_x;
133 u32 max_y;
134 u32 fuzz_x;
135 u32 fuzz_y;
136 bool invert_x;
137 bool invert_y;
138};
139
140struct iproc_ts_priv {
141 struct platform_device *pdev;
142 struct input_dev *idev;
143
144 void __iomem *regs;
145 struct clk *tsc_clk;
146
147 int pen_status;
148 struct tsc_param cfg_params;
149};
150
151
152
153
154
155static const struct tsc_param iproc_default_config = {
156 .scanning_period = 0x5,
157 .debounce_timeout = 0x28,
158 .settling_timeout = 0x7,
159 .touch_timeout = 0xa,
160 .average_data = 5,
161 .fifo_threshold = 1,
162 .max_x = X_MAX,
163 .max_y = Y_MAX,
164};
165
166static void ts_reg_dump(struct iproc_ts_priv *priv)
167{
168 struct device *dev = &priv->pdev->dev;
169
170 dbg_reg(dev, priv, REGCTL1);
171 dbg_reg(dev, priv, REGCTL2);
172 dbg_reg(dev, priv, INTERRUPT_THRES);
173 dbg_reg(dev, priv, INTERRUPT_MASK);
174 dbg_reg(dev, priv, INTERRUPT_STATUS);
175 dbg_reg(dev, priv, CONTROLLER_STATUS);
176 dbg_reg(dev, priv, FIFO_DATA);
177 dbg_reg(dev, priv, ANALOG_CONTROL);
178 dbg_reg(dev, priv, AUX_DATA);
179 dbg_reg(dev, priv, DEBOUNCE_CNTR_STAT);
180 dbg_reg(dev, priv, SCAN_CNTR_STAT);
181 dbg_reg(dev, priv, REM_CNTR_STAT);
182 dbg_reg(dev, priv, SETTLING_TIMER_STAT);
183 dbg_reg(dev, priv, SPARE_REG);
184 dbg_reg(dev, priv, SOFT_BYPASS_CONTROL);
185 dbg_reg(dev, priv, SOFT_BYPASS_DATA);
186}
187
188static irqreturn_t iproc_touchscreen_interrupt(int irq, void *data)
189{
190 struct platform_device *pdev = data;
191 struct iproc_ts_priv *priv = platform_get_drvdata(pdev);
192 u32 intr_status;
193 u32 raw_coordinate;
194 u16 x;
195 u16 y;
196 int i;
197 bool needs_sync = false;
198
199 intr_status = readl(priv->regs + INTERRUPT_STATUS);
200 intr_status &= TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
201 if (intr_status == 0)
202 return IRQ_NONE;
203
204
205 writel(intr_status, priv->regs + INTERRUPT_STATUS);
206
207
208 if (intr_status & TS_PEN_INTR_MASK) {
209 if (readl(priv->regs + CONTROLLER_STATUS) & TS_PEN_DOWN)
210 priv->pen_status = PEN_DOWN_STATUS;
211 else
212 priv->pen_status = PEN_UP_STATUS;
213
214 input_report_key(priv->idev, BTN_TOUCH, priv->pen_status);
215 needs_sync = true;
216
217 dev_dbg(&priv->pdev->dev,
218 "pen up-down (%d)\n", priv->pen_status);
219 }
220
221
222 if (intr_status & TS_FIFO_INTR_MASK) {
223 for (i = 0; i < priv->cfg_params.fifo_threshold; i++) {
224 raw_coordinate = readl(priv->regs + FIFO_DATA);
225 if (raw_coordinate == INVALID_COORD)
226 continue;
227
228
229
230
231
232
233 x = (raw_coordinate >> X_COORD_SHIFT) &
234 FIFO_DATA_X_Y_MASK;
235 y = (raw_coordinate >> Y_COORD_SHIFT) &
236 FIFO_DATA_X_Y_MASK;
237
238
239 x = (x >> 4) & 0x0FFF;
240 y = (y >> 4) & 0x0FFF;
241
242
243 if (priv->cfg_params.invert_x)
244 x = priv->cfg_params.max_x - x;
245
246 if (priv->cfg_params.invert_y)
247 y = priv->cfg_params.max_y - y;
248
249 input_report_abs(priv->idev, ABS_X, x);
250 input_report_abs(priv->idev, ABS_Y, y);
251 needs_sync = true;
252
253 dev_dbg(&priv->pdev->dev, "xy (0x%x 0x%x)\n", x, y);
254 }
255 }
256
257 if (needs_sync)
258 input_sync(priv->idev);
259
260 return IRQ_HANDLED;
261}
262
263static int iproc_ts_start(struct input_dev *idev)
264{
265 struct iproc_ts_priv *priv = input_get_drvdata(idev);
266 u32 val;
267 int error;
268
269
270 error = clk_prepare_enable(priv->tsc_clk);
271 if (error) {
272 dev_err(&priv->pdev->dev, "%s clk_prepare_enable failed %d\n",
273 __func__, error);
274 return error;
275 }
276
277
278
279
280
281 val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
282 writel(val, priv->regs + INTERRUPT_MASK);
283
284 writel(priv->cfg_params.fifo_threshold, priv->regs + INTERRUPT_THRES);
285
286
287 val = 0;
288 val |= priv->cfg_params.scanning_period << SCANNING_PERIOD_SHIFT;
289 val |= priv->cfg_params.debounce_timeout << DEBOUNCE_TIMEOUT_SHIFT;
290 val |= priv->cfg_params.settling_timeout << SETTLING_TIMEOUT_SHIFT;
291 val |= priv->cfg_params.touch_timeout << TOUCH_TIMEOUT_SHIFT;
292 writel(val, priv->regs + REGCTL1);
293
294
295 val = readl(priv->regs + INTERRUPT_STATUS);
296 val |= TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
297 writel(val, priv->regs + INTERRUPT_STATUS);
298
299
300 val = readl(priv->regs + REGCTL2);
301 val |= TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
302
303 val &= ~TS_CONTROLLER_AVGDATA_MASK;
304 val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
305
306 val &= ~(TS_CONTROLLER_PWR_LDO |
307 TS_CONTROLLER_PWR_ADC |
308 TS_CONTROLLER_PWR_BGP |
309 TS_CONTROLLER_PWR_TS);
310
311 writel(val, priv->regs + REGCTL2);
312
313 ts_reg_dump(priv);
314
315 return 0;
316}
317
318static void iproc_ts_stop(struct input_dev *dev)
319{
320 u32 val;
321 struct iproc_ts_priv *priv = input_get_drvdata(dev);
322
323 writel(0, priv->regs + INTERRUPT_MASK);
324
325
326 val = readl(priv->regs + REGCTL2);
327 val |= TS_CONTROLLER_PWR_TS;
328 writel(val, priv->regs + REGCTL2);
329
330 clk_disable(priv->tsc_clk);
331}
332
333static int iproc_get_tsc_config(struct device *dev, struct iproc_ts_priv *priv)
334{
335 struct device_node *np = dev->of_node;
336 u32 val;
337
338 priv->cfg_params = iproc_default_config;
339
340 if (!np)
341 return 0;
342
343 if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
344 if (val < 1 || val > 256) {
345 dev_err(dev, "scanning_period (%u) must be [1-256]\n",
346 val);
347 return -EINVAL;
348 }
349 priv->cfg_params.scanning_period = val;
350 }
351
352 if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
353 if (val > 255) {
354 dev_err(dev, "debounce_timeout (%u) must be [0-255]\n",
355 val);
356 return -EINVAL;
357 }
358 priv->cfg_params.debounce_timeout = val;
359 }
360
361 if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
362 if (val > 11) {
363 dev_err(dev, "settling_timeout (%u) must be [0-11]\n",
364 val);
365 return -EINVAL;
366 }
367 priv->cfg_params.settling_timeout = val;
368 }
369
370 if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
371 if (val > 255) {
372 dev_err(dev, "touch_timeout (%u) must be [0-255]\n",
373 val);
374 return -EINVAL;
375 }
376 priv->cfg_params.touch_timeout = val;
377 }
378
379 if (of_property_read_u32(np, "average_data", &val) >= 0) {
380 if (val > 8) {
381 dev_err(dev, "average_data (%u) must be [0-8]\n", val);
382 return -EINVAL;
383 }
384 priv->cfg_params.average_data = val;
385 }
386
387 if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
388 if (val > 31) {
389 dev_err(dev, "fifo_threshold (%u)) must be [0-31]\n",
390 val);
391 return -EINVAL;
392 }
393 priv->cfg_params.fifo_threshold = val;
394 }
395
396
397 of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
398 of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
399
400 of_property_read_u32(np, "touchscreen-fuzz-x",
401 &priv->cfg_params.fuzz_x);
402 of_property_read_u32(np, "touchscreen-fuzz-y",
403 &priv->cfg_params.fuzz_y);
404
405 priv->cfg_params.invert_x =
406 of_property_read_bool(np, "touchscreen-inverted-x");
407 priv->cfg_params.invert_y =
408 of_property_read_bool(np, "touchscreen-inverted-y");
409
410 return 0;
411}
412
413static int iproc_ts_probe(struct platform_device *pdev)
414{
415 struct iproc_ts_priv *priv;
416 struct input_dev *idev;
417 struct resource *res;
418 int irq;
419 int error;
420
421 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
422 if (!priv)
423 return -ENOMEM;
424
425
426 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
427 priv->regs = devm_ioremap_resource(&pdev->dev, res);
428 if (IS_ERR(priv->regs)) {
429 error = PTR_ERR(priv->regs);
430 dev_err(&pdev->dev, "unable to map I/O memory: %d\n", error);
431 return error;
432 }
433
434 priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
435 if (IS_ERR(priv->tsc_clk)) {
436 error = PTR_ERR(priv->tsc_clk);
437 dev_err(&pdev->dev,
438 "failed getting clock tsc_clk: %d\n", error);
439 return error;
440 }
441
442 priv->pdev = pdev;
443 error = iproc_get_tsc_config(&pdev->dev, priv);
444 if (error) {
445 dev_err(&pdev->dev, "get_tsc_config failed: %d\n", error);
446 return error;
447 }
448
449 idev = devm_input_allocate_device(&pdev->dev);
450 if (!idev) {
451 dev_err(&pdev->dev, "failed to allocate input device\n");
452 return -ENOMEM;
453 }
454
455 priv->idev = idev;
456 priv->pen_status = PEN_UP_STATUS;
457
458
459 idev->name = IPROC_TS_NAME;
460 idev->dev.parent = &pdev->dev;
461
462 idev->id.bustype = BUS_HOST;
463 idev->id.vendor = SERIO_UNKNOWN;
464 idev->id.product = 0;
465 idev->id.version = 0;
466
467 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
468 __set_bit(BTN_TOUCH, idev->keybit);
469
470 input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
471 priv->cfg_params.fuzz_x, 0);
472 input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
473 priv->cfg_params.fuzz_y, 0);
474
475 idev->open = iproc_ts_start;
476 idev->close = iproc_ts_stop;
477
478 input_set_drvdata(idev, priv);
479 platform_set_drvdata(pdev, priv);
480
481
482 irq = platform_get_irq(pdev, 0);
483 if (irq < 0) {
484 dev_err(&pdev->dev, "platform_get_irq failed: %d\n", irq);
485 return irq;
486 }
487
488 error = devm_request_irq(&pdev->dev, irq,
489 iproc_touchscreen_interrupt,
490 IRQF_SHARED, IPROC_TS_NAME, pdev);
491 if (error)
492 return error;
493
494 error = input_register_device(priv->idev);
495 if (error) {
496 dev_err(&pdev->dev,
497 "failed to register input device: %d\n", error);
498 return error;
499 }
500
501 return 0;
502}
503
504static const struct of_device_id iproc_ts_of_match[] = {
505 {.compatible = "brcm,iproc-touchscreen", },
506 { },
507};
508MODULE_DEVICE_TABLE(of, iproc_ts_of_match);
509
510static struct platform_driver iproc_ts_driver = {
511 .probe = iproc_ts_probe,
512 .driver = {
513 .name = IPROC_TS_NAME,
514 .of_match_table = of_match_ptr(iproc_ts_of_match),
515 },
516};
517
518module_platform_driver(iproc_ts_driver);
519
520MODULE_DESCRIPTION("IPROC Touchscreen driver");
521MODULE_AUTHOR("Broadcom");
522MODULE_LICENSE("GPL v2");
523
