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authorArnaud Patard <arnaud.patard@rtp-net.org>2009-11-23 12:47:12 -0500
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-23 12:47:47 -0500
commitf5f96b93e745dd054110d511779e7ec5cfdfdfe6 (patch)
tree5bd38887dcd5fdc74b87d2750941ebedab7149da /drivers/input/touchscreen
parent2330ed18b27a8f4f10e48e0a1c65ede56e03825c (diff)
Input: add S3C24XX touchscreen driver
S3C24XX touchscreen driver, originally written by Arnaud Patard and other contributors. The driver has had substantial testing as well as a number of tidying up passes done by Ben Dooks, as noted: - added kernel-doc comments to most of the routines - removed old code from pre adc framework days - updated device probe code to use platform id list matching - cleaned up debug, since printk() now has timestamp feature - ensure code uses dev_() reporting macros where necessary - remove ABS_PRESSURE reporting, tslib can be fixed - ensure timer is removed on driver exit - move to using dev_pmops for power management Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org> Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Simtec Linux Team <linux@simtec.co.uk> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/Kconfig12
-rw-r--r--drivers/input/touchscreen/Makefile3
-rw-r--r--drivers/input/touchscreen/s3c2410_ts.c457
3 files changed, 471 insertions, 1 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index c04fb531d63d..acf00896f48a 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -145,6 +145,18 @@ config TOUCHSCREEN_FUJITSU
145 To compile this driver as a module, choose M here: the 145 To compile this driver as a module, choose M here: the
146 module will be called fujitsu-ts. 146 module will be called fujitsu-ts.
147 147
148config TOUCHSCREEN_S3C2410
149 tristate "Samsung S3C2410 touchscreen input driver"
150 depends on ARCH_S3C2410
151 select S3C24XX_ADC
152 help
153 Say Y here if you have the s3c2410 touchscreen.
154
155 If unsure, say N.
156
157 To compile this driver as a module, choose M here: the
158 module will be called s3c2410_ts.
159
148config TOUCHSCREEN_GUNZE 160config TOUCHSCREEN_GUNZE
149 tristate "Gunze AHL-51S touchscreen" 161 tristate "Gunze AHL-51S touchscreen"
150 select SERIO 162 select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 1f5cccd3a16a..f1f59c9e1211 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -26,7 +26,9 @@ obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
26obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o 26obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o
27obj-$(CONFIG_TOUCHSCREEN_HTCPEN) += htcpen.o 27obj-$(CONFIG_TOUCHSCREEN_HTCPEN) += htcpen.o
28obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o 28obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o
29obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
29obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o 30obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
31obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
30obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o 32obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
31obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o 33obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
32obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o 34obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
@@ -42,4 +44,3 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o
42obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o 44obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
43obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o 45obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
44obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o 46obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
45obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c
new file mode 100644
index 000000000000..6386b441ef85
--- /dev/null
+++ b/drivers/input/touchscreen/s3c2410_ts.c
@@ -0,0 +1,457 @@
1/*
2 * Samsung S3C24XX touchscreen driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the term of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
19 * Copyright 2008 Ben Dooks <ben-linux@fluff.org>
20 * Copyright 2009 Simtec Electronics <linux@simtec.co.uk>
21 *
22 * Additional work by Herbert Pƶtzl <herbert@13thfloor.at> and
23 * Harald Welte <laforge@openmoko.org>
24 */
25
26#include <linux/errno.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/gpio.h>
31#include <linux/input.h>
32#include <linux/init.h>
33#include <linux/delay.h>
34#include <linux/interrupt.h>
35#include <linux/platform_device.h>
36#include <linux/clk.h>
37#include <linux/io.h>
38
39#include <plat/adc.h>
40#include <plat/regs-adc.h>
41
42#include <mach/regs-gpio.h>
43#include <mach/ts.h>
44
45#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
46
47#define INT_DOWN (0)
48#define INT_UP (1 << 8)
49
50#define WAIT4INT (S3C2410_ADCTSC_YM_SEN | \
51 S3C2410_ADCTSC_YP_SEN | \
52 S3C2410_ADCTSC_XP_SEN | \
53 S3C2410_ADCTSC_XY_PST(3))
54
55#define AUTOPST (S3C2410_ADCTSC_YM_SEN | \
56 S3C2410_ADCTSC_YP_SEN | \
57 S3C2410_ADCTSC_XP_SEN | \
58 S3C2410_ADCTSC_AUTO_PST | \
59 S3C2410_ADCTSC_XY_PST(0))
60
61/* Per-touchscreen data. */
62
63/**
64 * struct s3c2410ts - driver touchscreen state.
65 * @client: The ADC client we registered with the core driver.
66 * @dev: The device we are bound to.
67 * @input: The input device we registered with the input subsystem.
68 * @clock: The clock for the adc.
69 * @io: Pointer to the IO base.
70 * @xp: The accumulated X position data.
71 * @yp: The accumulated Y position data.
72 * @irq_tc: The interrupt number for pen up/down interrupt
73 * @count: The number of samples collected.
74 * @shift: The log2 of the maximum count to read in one go.
75 */
76struct s3c2410ts {
77 struct s3c_adc_client *client;
78 struct device *dev;
79 struct input_dev *input;
80 struct clk *clock;
81 void __iomem *io;
82 unsigned long xp;
83 unsigned long yp;
84 int irq_tc;
85 int count;
86 int shift;
87};
88
89static struct s3c2410ts ts;
90
91/**
92 * s3c2410_ts_connect - configure gpio for s3c2410 systems
93 *
94 * Configure the GPIO for the S3C2410 system, where we have external FETs
95 * connected to the device (later systems such as the S3C2440 integrate
96 * these into the device).
97*/
98static inline void s3c2410_ts_connect(void)
99{
100 s3c2410_gpio_cfgpin(S3C2410_GPG(12), S3C2410_GPG12_XMON);
101 s3c2410_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPG13_nXPON);
102 s3c2410_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPG14_YMON);
103 s3c2410_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPG15_nYPON);
104}
105
106/**
107 * get_down - return the down state of the pen
108 * @data0: The data read from ADCDAT0 register.
109 * @data1: The data read from ADCDAT1 register.
110 *
111 * Return non-zero if both readings show that the pen is down.
112 */
113static inline bool get_down(unsigned long data0, unsigned long data1)
114{
115 /* returns true if both data values show stylus down */
116 return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
117 !(data1 & S3C2410_ADCDAT0_UPDOWN));
118}
119
120static void touch_timer_fire(unsigned long data)
121{
122 unsigned long data0;
123 unsigned long data1;
124 bool down;
125
126 data0 = readl(ts.io + S3C2410_ADCDAT0);
127 data1 = readl(ts.io + S3C2410_ADCDAT1);
128
129 down = get_down(data0, data1);
130
131 if (ts.count == (1 << ts.shift)) {
132 ts.xp >>= ts.shift;
133 ts.yp >>= ts.shift;
134
135 dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
136 __func__, ts.xp, ts.yp, ts.count);
137
138 input_report_abs(ts.input, ABS_X, ts.xp);
139 input_report_abs(ts.input, ABS_Y, ts.yp);
140
141 input_report_key(ts.input, BTN_TOUCH, 1);
142 input_sync(ts.input);
143
144 ts.xp = 0;
145 ts.yp = 0;
146 ts.count = 0;
147 }
148
149 if (down) {
150 s3c_adc_start(ts.client, 0, 1 << ts.shift);
151 } else {
152 ts.count = 0;
153
154 input_report_key(ts.input, BTN_TOUCH, 0);
155 input_sync(ts.input);
156
157 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
158 }
159}
160
161static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);
162
163/**
164 * stylus_irq - touchscreen stylus event interrupt
165 * @irq: The interrupt number
166 * @dev_id: The device ID.
167 *
168 * Called when the IRQ_TC is fired for a pen up or down event.
169 */
170static irqreturn_t stylus_irq(int irq, void *dev_id)
171{
172 unsigned long data0;
173 unsigned long data1;
174 bool down;
175
176 data0 = readl(ts.io + S3C2410_ADCDAT0);
177 data1 = readl(ts.io + S3C2410_ADCDAT1);
178
179 down = get_down(data0, data1);
180
181 /* TODO we should never get an interrupt with down set while
182 * the timer is running, but maybe we ought to verify that the
183 * timer isn't running anyways. */
184
185 if (down)
186 s3c_adc_start(ts.client, 0, 1 << ts.shift);
187 else
188 dev_info(ts.dev, "%s: count=%d\n", __func__, ts.count);
189
190 return IRQ_HANDLED;
191}
192
193/**
194 * s3c24xx_ts_conversion - ADC conversion callback
195 * @client: The client that was registered with the ADC core.
196 * @data0: The reading from ADCDAT0.
197 * @data1: The reading from ADCDAT1.
198 * @left: The number of samples left.
199 *
200 * Called when a conversion has finished.
201 */
202static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
203 unsigned data0, unsigned data1,
204 unsigned *left)
205{
206 dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);
207
208 ts.xp += data0;
209 ts.yp += data1;
210
211 ts.count++;
212
213 /* From tests, it seems that it is unlikely to get a pen-up
214 * event during the conversion process which means we can
215 * ignore any pen-up events with less than the requisite
216 * count done.
217 *
218 * In several thousand conversions, no pen-ups where detected
219 * before count completed.
220 */
221}
222
223/**
224 * s3c24xx_ts_select - ADC selection callback.
225 * @client: The client that was registered with the ADC core.
226 * @select: The reason for select.
227 *
228 * Called when the ADC core selects (or deslects) us as a client.
229 */
230static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
231{
232 if (select) {
233 writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
234 ts.io + S3C2410_ADCTSC);
235 } else {
236 mod_timer(&touch_timer, jiffies+1);
237 writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC);
238 }
239}
240
241/**
242 * s3c2410ts_probe - device core probe entry point
243 * @pdev: The device we are being bound to.
244 *
245 * Initialise, find and allocate any resources we need to run and then
246 * register with the ADC and input systems.
247 */
248static int __devinit s3c2410ts_probe(struct platform_device *pdev)
249{
250 struct s3c2410_ts_mach_info *info;
251 struct device *dev = &pdev->dev;
252 struct input_dev *input_dev;
253 struct resource *res;
254 int ret = -EINVAL;
255
256 /* Initialise input stuff */
257 memset(&ts, 0, sizeof(struct s3c2410ts));
258
259 ts.dev = dev;
260
261 info = pdev->dev.platform_data;
262 if (!info) {
263 dev_err(dev, "no platform data, cannot attach\n");
264 return -EINVAL;
265 }
266
267 dev_dbg(dev, "initialising touchscreen\n");
268
269 ts.clock = clk_get(dev, "adc");
270 if (IS_ERR(ts.clock)) {
271 dev_err(dev, "cannot get adc clock source\n");
272 return -ENOENT;
273 }
274
275 clk_enable(ts.clock);
276 dev_dbg(dev, "got and enabled clocks\n");
277
278 ts.irq_tc = ret = platform_get_irq(pdev, 0);
279 if (ret < 0) {
280 dev_err(dev, "no resource for interrupt\n");
281 goto err_clk;
282 }
283
284 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
285 if (!res) {
286 dev_err(dev, "no resource for registers\n");
287 ret = -ENOENT;
288 goto err_clk;
289 }
290
291 ts.io = ioremap(res->start, resource_size(res));
292 if (ts.io == NULL) {
293 dev_err(dev, "cannot map registers\n");
294 ret = -ENOMEM;
295 goto err_clk;
296 }
297
298 /* Configure the touchscreen external FETs on the S3C2410 */
299 if (!platform_get_device_id(pdev)->driver_data)
300 s3c2410_ts_connect();
301
302 ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
303 s3c24xx_ts_conversion, 1);
304 if (IS_ERR(ts.client)) {
305 dev_err(dev, "failed to register adc client\n");
306 ret = PTR_ERR(ts.client);
307 goto err_iomap;
308 }
309
310 /* Initialise registers */
311 if ((info->delay & 0xffff) > 0)
312 writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
313
314 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
315
316 input_dev = input_allocate_device();
317 if (!input_dev) {
318 dev_err(dev, "Unable to allocate the input device !!\n");
319 ret = -ENOMEM;
320 goto err_iomap;
321 }
322
323 ts.input = input_dev;
324 ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
325 ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
326 input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
327 input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);
328
329 ts.input->name = "S3C24XX TouchScreen";
330 ts.input->id.bustype = BUS_HOST;
331 ts.input->id.vendor = 0xDEAD;
332 ts.input->id.product = 0xBEEF;
333 ts.input->id.version = 0x0102;
334
335 ts.shift = info->oversampling_shift;
336
337 ret = request_irq(ts.irq_tc, stylus_irq, IRQF_DISABLED,
338 "s3c2410_ts_pen", ts.input);
339 if (ret) {
340 dev_err(dev, "cannot get TC interrupt\n");
341 goto err_inputdev;
342 }
343
344 dev_info(dev, "driver attached, registering input device\n");
345
346 /* All went ok, so register to the input system */
347 ret = input_register_device(ts.input);
348 if (ret < 0) {
349 dev_err(dev, "failed to register input device\n");
350 ret = -EIO;
351 goto err_tcirq;
352 }
353
354 return 0;
355
356 err_tcirq:
357 free_irq(ts.irq_tc, ts.input);
358 err_inputdev:
359 input_unregister_device(ts.input);
360 err_iomap:
361 iounmap(ts.io);
362 err_clk:
363 del_timer_sync(&touch_timer);
364 clk_put(ts.clock);
365 return ret;
366}
367
368/**
369 * s3c2410ts_remove - device core removal entry point
370 * @pdev: The device we are being removed from.
371 *
372 * Free up our state ready to be removed.
373 */
374static int __devexit s3c2410ts_remove(struct platform_device *pdev)
375{
376 free_irq(ts.irq_tc, ts.input);
377 del_timer_sync(&touch_timer);
378
379 clk_disable(ts.clock);
380 clk_put(ts.clock);
381
382 input_unregister_device(ts.input);
383 iounmap(ts.io);
384
385 return 0;
386}
387
388#ifdef CONFIG_PM
389static int s3c2410ts_suspend(struct device *dev)
390{
391 writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
392 disable_irq(ts.irq_tc);
393 clk_disable(ts.clock);
394
395 return 0;
396}
397
398static int s3c2410ts_resume(struct device *dev)
399{
400 struct platform_device *pdev = to_platform_device(dev);
401 struct s3c2410_ts_mach_info *info = pdev->dev.platform_data;
402
403 clk_enable(ts.clock);
404
405 /* Initialise registers */
406 if ((info->delay & 0xffff) > 0)
407 writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
408
409 writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
410
411 return 0;
412}
413
414static struct dev_pm_ops s3c_ts_pmops = {
415 .suspend = s3c2410ts_suspend,
416 .resume = s3c2410ts_resume,
417};
418#endif
419
420static struct platform_device_id s3cts_driver_ids[] = {
421 { "s3c2410-ts", 0 },
422 { "s3c2440-ts", 1 },
423 { }
424};
425MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);
426
427static struct platform_driver s3c_ts_driver = {
428 .driver = {
429 .name = "s3c24xx-ts",
430 .owner = THIS_MODULE,
431#ifdef CONFIG_PM
432 .pm = &s3c_ts_pmops,
433#endif
434 },
435 .id_table = s3cts_driver_ids,
436 .probe = s3c2410ts_probe,
437 .remove = __devexit_p(s3c2410ts_remove),
438};
439
440static int __init s3c2410ts_init(void)
441{
442 return platform_driver_register(&s3c_ts_driver);
443}
444
445static void __exit s3c2410ts_exit(void)
446{
447 platform_driver_unregister(&s3c_ts_driver);
448}
449
450module_init(s3c2410ts_init);
451module_exit(s3c2410ts_exit);
452
453MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
454 "Ben Dooks <ben@simtec.co.uk>, "
455 "Simtec Electronics <linux@simtec.co.uk>");
456MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
457MODULE_LICENSE("GPL v2");