tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models
3 *
4 * Copyright (c) 2004-2005 Richard Purdie
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12
13#include <linux/delay.h>
14#include <linux/platform_device.h>
15#include <linux/init.h>
16#include <linux/input.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <linux/slab.h>
20#include <linux/irq.h>
21
22#include <asm/arch/sharpsl.h>
23#include <asm/arch/hardware.h>
24#include <asm/arch/pxa-regs.h>
25
26
27#define PWR_MODE_ACTIVE 0
28#define PWR_MODE_SUSPEND 1
29
30#define X_AXIS_MAX 3830
31#define X_AXIS_MIN 150
32#define Y_AXIS_MAX 3830
33#define Y_AXIS_MIN 190
34#define PRESSURE_MIN 0
35#define PRESSURE_MAX 15000
36
37struct ts_event {
38 short pressure;
39 short x;
40 short y;
41};
42
43struct corgi_ts {
44 struct input_dev *input;
45 struct timer_list timer;
46 struct ts_event tc;
47 int pendown;
48 int power_mode;
49 int irq_gpio;
50 struct corgits_machinfo *machinfo;
51};
52
53#ifdef CONFIG_PXA25x
54#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
55#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
56#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
57#endif
58#ifdef CONFIG_PXA27x
59#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
60#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x))
61#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x))
62#endif
63
64/* ADS7846 Touch Screen Controller bit definitions */
65#define ADSCTRL_PD0 (1u << 0) /* PD0 */
66#define ADSCTRL_PD1 (1u << 1) /* PD1 */
67#define ADSCTRL_DFR (1u << 2) /* SER/DFR */
68#define ADSCTRL_MOD (1u << 3) /* Mode */
69#define ADSCTRL_ADR_SH 4 /* Address setting */
70#define ADSCTRL_STS (1u << 7) /* Start Bit */
71
72/* External Functions */
73extern unsigned int get_clk_frequency_khz(int info);
74
75static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
76{
77 unsigned long hsync_len = corgi_ts->machinfo->get_hsync_len();
78
79 if (hsync_len)
80 return get_clk_frequency_khz(0)*1000/hsync_len;
81 else
82 return 0;
83}
84
85static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend,
86 unsigned int address, unsigned long wait_time)
87{
88 unsigned long timer1 = 0, timer2, pmnc = 0;
89 int pos = 0;
90
91 if (wait_time && doSend) {
92 PMNC_GET(pmnc);
93 if (!(pmnc & 0x01))
94 PMNC_SET(0x01);
95
96 /* polling HSync */
97 corgi_ts->machinfo->wait_hsync();
98 /* get CCNT */
99 CCNT(timer1);
100 }
101
102 if (doRecive)
103 pos = corgi_ssp_ads7846_get();
104
105 if (doSend) {
106 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
107 /* dummy command */
108 corgi_ssp_ads7846_put(cmd);
109 corgi_ssp_ads7846_get();
110
111 if (wait_time) {
112 /* Wait after HSync */
113 CCNT(timer2);
114 if (timer2-timer1 > wait_time) {
115 /* too slow - timeout, try again */
116 corgi_ts->machinfo->wait_hsync();
117 /* get OSCR */
118 CCNT(timer1);
119 /* Wait after HSync */
120 CCNT(timer2);
121 }
122 while (timer2 - timer1 < wait_time)
123 CCNT(timer2);
124 }
125 corgi_ssp_ads7846_put(cmd);
126 if (wait_time && !(pmnc & 0x01))
127 PMNC_SET(pmnc);
128 }
129 return pos;
130}
131
132static int read_xydata(struct corgi_ts *corgi_ts)
133{
134 unsigned int x, y, z1, z2;
135 unsigned long flags, wait_time;
136
137 /* critical section */
138 local_irq_save(flags);
139 corgi_ssp_ads7846_lock();
140 wait_time = calc_waittime(corgi_ts);
141
142 /* Y-axis */
143 sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
144
145 /* Y-axis */
146 sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
147
148 /* X-axis */
149 y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
150
151 /* Z1 */
152 x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
153
154 /* Z2 */
155 z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time);
156 z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time);
157
158 /* Power-Down Enable */
159 corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
160 corgi_ssp_ads7846_get();
161
162 corgi_ssp_ads7846_unlock();
163 local_irq_restore(flags);
164
165 if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
166 corgi_ts->tc.pressure = 0;
167 return 0;
168 }
169
170 corgi_ts->tc.x = x;
171 corgi_ts->tc.y = y;
172 corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
173 return 1;
174}
175
176static void new_data(struct corgi_ts *corgi_ts)
177{
178 struct input_dev *dev = corgi_ts->input;
179
180 if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
181 return;
182
183 if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
184 return;
185
186 input_report_abs(dev, ABS_X, corgi_ts->tc.x);
187 input_report_abs(dev, ABS_Y, corgi_ts->tc.y);
188 input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure);
189 input_report_key(dev, BTN_TOUCH, corgi_ts->pendown);
190 input_sync(dev);
191}
192
193static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
194{
195 if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
196 /* Disable Interrupt */
197 set_irq_type(corgi_ts->irq_gpio, IRQT_NOEDGE);
198 if (read_xydata(corgi_ts)) {
199 corgi_ts->pendown = 1;
200 new_data(corgi_ts);
201 }
202 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
203 } else {
204 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
205 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
206 corgi_ts->pendown++;
207 return;
208 }
209
210 if (corgi_ts->pendown) {
211 corgi_ts->tc.pressure = 0;
212 new_data(corgi_ts);
213 }
214
215 /* Enable Falling Edge */
216 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
217 corgi_ts->pendown = 0;
218 }
219}
220
221static void corgi_ts_timer(unsigned long data)
222{
223 struct corgi_ts *corgits_data = (struct corgi_ts *) data;
224
225 ts_interrupt_main(corgits_data, 1);
226}
227
228static irqreturn_t ts_interrupt(int irq, void *dev_id)
229{
230 struct corgi_ts *corgits_data = dev_id;
231
232 ts_interrupt_main(corgits_data, 0);
233 return IRQ_HANDLED;
234}
235
236#ifdef CONFIG_PM
237static int corgits_suspend(struct platform_device *dev, pm_message_t state)
238{
239 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
240
241 if (corgi_ts->pendown) {
242 del_timer_sync(&corgi_ts->timer);
243 corgi_ts->tc.pressure = 0;
244 new_data(corgi_ts);
245 corgi_ts->pendown = 0;
246 }
247 corgi_ts->power_mode = PWR_MODE_SUSPEND;
248
249 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
250
251 return 0;
252}
253
254static int corgits_resume(struct platform_device *dev)
255{
256 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
257
258 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
259 /* Enable Falling Edge */
260 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
261 corgi_ts->power_mode = PWR_MODE_ACTIVE;
262
263 return 0;
264}
265#else
266#define corgits_suspend NULL
267#define corgits_resume NULL
268#endif
269
270static int __init corgits_probe(struct platform_device *pdev)
271{
272 struct corgi_ts *corgi_ts;
273 struct input_dev *input_dev;
274 int err = -ENOMEM;
275
276 corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
277 input_dev = input_allocate_device();
278 if (!corgi_ts || !input_dev)
279 goto fail1;
280
281 platform_set_drvdata(pdev, corgi_ts);
282
283 corgi_ts->machinfo = pdev->dev.platform_data;
284 corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
285
286 if (corgi_ts->irq_gpio < 0) {
287 err = -ENODEV;
288 goto fail1;
289 }
290
291 corgi_ts->input = input_dev;
292
293 init_timer(&corgi_ts->timer);
294 corgi_ts->timer.data = (unsigned long) corgi_ts;
295 corgi_ts->timer.function = corgi_ts_timer;
296
297 input_dev->name = "Corgi Touchscreen";
298 input_dev->phys = "corgits/input0";
299 input_dev->id.bustype = BUS_HOST;
300 input_dev->id.vendor = 0x0001;
301 input_dev->id.product = 0x0002;
302 input_dev->id.version = 0x0100;
303 input_dev->dev.parent = &pdev->dev;
304
305 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
306 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
307 input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
308 input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
309 input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
310
311 pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
312
313 /* Initiaize ADS7846 Difference Reference mode */
314 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
315 mdelay(5);
316 corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
317 mdelay(5);
318 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
319 mdelay(5);
320 corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
321 mdelay(5);
322
323 if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
324 err = -EBUSY;
325 goto fail1;
326 }
327
328 err = input_register_device(corgi_ts->input);
329 if (err)
330 goto fail2;
331
332 corgi_ts->power_mode = PWR_MODE_ACTIVE;
333
334 /* Enable Falling Edge */
335 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
336
337 return 0;
338
339 fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
340 fail1: input_free_device(input_dev);
341 kfree(corgi_ts);
342 return err;
343}
344
345static int corgits_remove(struct platform_device *pdev)
346{
347 struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
348
349 free_irq(corgi_ts->irq_gpio, corgi_ts);
350 del_timer_sync(&corgi_ts->timer);
351 corgi_ts->machinfo->put_hsync();
352 input_unregister_device(corgi_ts->input);
353 kfree(corgi_ts);
354 return 0;
355}
356
357static struct platform_driver corgits_driver = {
358 .probe = corgits_probe,
359 .remove = corgits_remove,
360 .suspend = corgits_suspend,
361 .resume = corgits_resume,
362 .driver = {
363 .name = "corgi-ts",
364 },
365};
366
367static int __devinit corgits_init(void)
368{
369 return platform_driver_register(&corgits_driver);
370}
371
372static void __exit corgits_exit(void)
373{
374 platform_driver_unregister(&corgits_driver);
375}
376
377module_init(corgits_init);
378module_exit(corgits_exit);
379
380MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
381MODULE_DESCRIPTION("Corgi TouchScreen Driver");
382MODULE_LICENSE("GPL");