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26#include <linux/errno.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/gpio.h>
30#include <linux/input.h>
31#include <linux/delay.h>
32#include <linux/interrupt.h>
33#include <linux/platform_device.h>
34#include <linux/clk.h>
35#include <linux/io.h>
36
37#include <plat/adc.h>
38#include <plat/regs-adc.h>
39#include <linux/platform_data/touchscreen-s3c2410.h>
40
41#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
42
43#define INT_DOWN (0)
44#define INT_UP (1 << 8)
45
46#define WAIT4INT (S3C2410_ADCTSC_YM_SEN | \
47 S3C2410_ADCTSC_YP_SEN | \
48 S3C2410_ADCTSC_XP_SEN | \
49 S3C2410_ADCTSC_XY_PST(3))
50
51#define AUTOPST (S3C2410_ADCTSC_YM_SEN | \
52 S3C2410_ADCTSC_YP_SEN | \
53 S3C2410_ADCTSC_XP_SEN | \
54 S3C2410_ADCTSC_AUTO_PST | \
55 S3C2410_ADCTSC_XY_PST(0))
56
57#define FEAT_PEN_IRQ (1 << 0)
58
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74
75struct s3c2410ts {
76 struct s3c_adc_client *client;
77 struct device *dev;
78 struct input_dev *input;
79 struct clk *clock;
80 void __iomem *io;
81 unsigned long xp;
82 unsigned long yp;
83 int irq_tc;
84 int count;
85 int shift;
86 int features;
87};
88
89static struct s3c2410ts ts;
90
91
92
93
94
95
96
97
98static inline bool get_down(unsigned long data0, unsigned long data1)
99{
100
101 return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
102 !(data1 & S3C2410_ADCDAT0_UPDOWN));
103}
104
105static void touch_timer_fire(unsigned long data)
106{
107 unsigned long data0;
108 unsigned long data1;
109 bool down;
110
111 data0 = readl(ts.io + S3C2410_ADCDAT0);
112 data1 = readl(ts.io + S3C2410_ADCDAT1);
113
114 down = get_down(data0, data1);
115
116 if (down) {
117 if (ts.count == (1 << ts.shift)) {
118 ts.xp >>= ts.shift;
119 ts.yp >>= ts.shift;
120
121 dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
122 __func__, ts.xp, ts.yp, ts.count);
123
124 input_report_abs(ts.input, ABS_X, ts.xp);
125 input_report_abs(ts.input, ABS_Y, ts.yp);
126
127 input_report_key(ts.input, BTN_TOUCH, 1);
128 input_sync(ts.input);
129
130 ts.xp = 0;
131 ts.yp = 0;
132 ts.count = 0;
133 }
134
135 s3c_adc_start(ts.client, 0, 1 << ts.shift);
136 } else {
137 ts.xp = 0;
138 ts.yp = 0;
139 ts.count = 0;
140
141 input_report_key(ts.input, BTN_TOUCH, 0);
142 input_sync(ts.input);
143
144 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
145 }
146}
147
148static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);
149
150
151
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153
154
155
156
157static irqreturn_t stylus_irq(int irq, void *dev_id)
158{
159 unsigned long data0;
160 unsigned long data1;
161 bool down;
162
163 data0 = readl(ts.io + S3C2410_ADCDAT0);
164 data1 = readl(ts.io + S3C2410_ADCDAT1);
165
166 down = get_down(data0, data1);
167
168
169
170
171
172 if (down)
173 s3c_adc_start(ts.client, 0, 1 << ts.shift);
174 else
175 dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count);
176
177 if (ts.features & FEAT_PEN_IRQ) {
178
179 writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP);
180 }
181
182 return IRQ_HANDLED;
183}
184
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189
190
191
192
193
194static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
195 unsigned data0, unsigned data1,
196 unsigned *left)
197{
198 dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);
199
200 ts.xp += data0;
201 ts.yp += data1;
202
203 ts.count++;
204
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210
211
212
213}
214
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220
221
222static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
223{
224 if (select) {
225 writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
226 ts.io + S3C2410_ADCTSC);
227 } else {
228 mod_timer(&touch_timer, jiffies+1);
229 writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC);
230 }
231}
232
233
234
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237
238
239
240static int s3c2410ts_probe(struct platform_device *pdev)
241{
242 struct s3c2410_ts_mach_info *info;
243 struct device *dev = &pdev->dev;
244 struct input_dev *input_dev;
245 struct resource *res;
246 int ret = -EINVAL;
247
248
249 memset(&ts, 0, sizeof(struct s3c2410ts));
250
251 ts.dev = dev;
252
253 info = dev_get_platdata(&pdev->dev);
254 if (!info) {
255 dev_err(dev, "no platform data, cannot attach\n");
256 return -EINVAL;
257 }
258
259 dev_dbg(dev, "initialising touchscreen\n");
260
261 ts.clock = clk_get(dev, "adc");
262 if (IS_ERR(ts.clock)) {
263 dev_err(dev, "cannot get adc clock source\n");
264 return -ENOENT;
265 }
266
267 clk_prepare_enable(ts.clock);
268 dev_dbg(dev, "got and enabled clocks\n");
269
270 ts.irq_tc = ret = platform_get_irq(pdev, 0);
271 if (ret < 0) {
272 dev_err(dev, "no resource for interrupt\n");
273 goto err_clk;
274 }
275
276 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
277 if (!res) {
278 dev_err(dev, "no resource for registers\n");
279 ret = -ENOENT;
280 goto err_clk;
281 }
282
283 ts.io = ioremap(res->start, resource_size(res));
284 if (ts.io == NULL) {
285 dev_err(dev, "cannot map registers\n");
286 ret = -ENOMEM;
287 goto err_clk;
288 }
289
290
291 if (info->cfg_gpio)
292 info->cfg_gpio(to_platform_device(ts.dev));
293
294 ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
295 s3c24xx_ts_conversion, 1);
296 if (IS_ERR(ts.client)) {
297 dev_err(dev, "failed to register adc client\n");
298 ret = PTR_ERR(ts.client);
299 goto err_iomap;
300 }
301
302
303 if ((info->delay & 0xffff) > 0)
304 writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
305
306 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
307
308 input_dev = input_allocate_device();
309 if (!input_dev) {
310 dev_err(dev, "Unable to allocate the input device !!\n");
311 ret = -ENOMEM;
312 goto err_iomap;
313 }
314
315 ts.input = input_dev;
316 ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
317 ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
318 input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
319 input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);
320
321 ts.input->name = "S3C24XX TouchScreen";
322 ts.input->id.bustype = BUS_HOST;
323 ts.input->id.vendor = 0xDEAD;
324 ts.input->id.product = 0xBEEF;
325 ts.input->id.version = 0x0102;
326
327 ts.shift = info->oversampling_shift;
328 ts.features = platform_get_device_id(pdev)->driver_data;
329
330 ret = request_irq(ts.irq_tc, stylus_irq, 0,
331 "s3c2410_ts_pen", ts.input);
332 if (ret) {
333 dev_err(dev, "cannot get TC interrupt\n");
334 goto err_inputdev;
335 }
336
337 dev_info(dev, "driver attached, registering input device\n");
338
339
340 ret = input_register_device(ts.input);
341 if (ret < 0) {
342 dev_err(dev, "failed to register input device\n");
343 ret = -EIO;
344 goto err_tcirq;
345 }
346
347 return 0;
348
349 err_tcirq:
350 free_irq(ts.irq_tc, ts.input);
351 err_inputdev:
352 input_free_device(ts.input);
353 err_iomap:
354 iounmap(ts.io);
355 err_clk:
356 del_timer_sync(&touch_timer);
357 clk_put(ts.clock);
358 return ret;
359}
360
361
362
363
364
365
366
367static int s3c2410ts_remove(struct platform_device *pdev)
368{
369 free_irq(ts.irq_tc, ts.input);
370 del_timer_sync(&touch_timer);
371
372 clk_disable_unprepare(ts.clock);
373 clk_put(ts.clock);
374
375 input_unregister_device(ts.input);
376 iounmap(ts.io);
377
378 return 0;
379}
380
381#ifdef CONFIG_PM
382static int s3c2410ts_suspend(struct device *dev)
383{
384 writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
385 disable_irq(ts.irq_tc);
386 clk_disable(ts.clock);
387
388 return 0;
389}
390
391static int s3c2410ts_resume(struct device *dev)
392{
393 struct platform_device *pdev = to_platform_device(dev);
394 struct s3c2410_ts_mach_info *info = dev_get_platdata(&pdev->dev);
395
396 clk_enable(ts.clock);
397 enable_irq(ts.irq_tc);
398
399
400 if ((info->delay & 0xffff) > 0)
401 writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
402
403 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
404
405 return 0;
406}
407
408static const struct dev_pm_ops s3c_ts_pmops = {
409 .suspend = s3c2410ts_suspend,
410 .resume = s3c2410ts_resume,
411};
412#endif
413
414static const struct platform_device_id s3cts_driver_ids[] = {
415 { "s3c2410-ts", 0 },
416 { "s3c2440-ts", 0 },
417 { "s3c64xx-ts", FEAT_PEN_IRQ },
418 { }
419};
420MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);
421
422static struct platform_driver s3c_ts_driver = {
423 .driver = {
424 .name = "samsung-ts",
425#ifdef CONFIG_PM
426 .pm = &s3c_ts_pmops,
427#endif
428 },
429 .id_table = s3cts_driver_ids,
430 .probe = s3c2410ts_probe,
431 .remove = s3c2410ts_remove,
432};
433module_platform_driver(s3c_ts_driver);
434
435MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
436 "Ben Dooks <ben@simtec.co.uk>, "
437 "Simtec Electronics <linux@simtec.co.uk>");
438MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
439MODULE_LICENSE("GPL v2");
440