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#include <asm/arch/pxa2xx-gpio.h>
26
27
28#define PWR_MODE_ACTIVE 0
29#define PWR_MODE_SUSPEND 1
30
31#define X_AXIS_MAX 3830
32#define X_AXIS_MIN 150
33#define Y_AXIS_MAX 3830
34#define Y_AXIS_MIN 190
35#define PRESSURE_MIN 0
36#define PRESSURE_MAX 15000
37
38struct ts_event {
39 short pressure;
40 short x;
41 short y;
42};
43
44struct corgi_ts {
45 struct input_dev *input;
46 struct timer_list timer;
47 struct ts_event tc;
48 int pendown;
49 int power_mode;
50 int irq_gpio;
51 struct corgits_machinfo *machinfo;
52};
53
54#ifdef CONFIG_PXA25x
55#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
56#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
57#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
58#endif
59#ifdef CONFIG_PXA27x
60#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
61#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x))
62#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x))
63#endif
64
65/* ADS7846 Touch Screen Controller bit definitions */
66#define ADSCTRL_PD0 (1u << 0) /* PD0 */
67#define ADSCTRL_PD1 (1u << 1) /* PD1 */
68#define ADSCTRL_DFR (1u << 2) /* SER/DFR */
69#define ADSCTRL_MOD (1u << 3) /* Mode */
70#define ADSCTRL_ADR_SH 4 /* Address setting */
71#define ADSCTRL_STS (1u << 7) /* Start Bit */
72
73/* External Functions */
74extern unsigned int get_clk_frequency_khz(int info);
75
76static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
77{
78 unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod();
79
80 if (hsync_invperiod)
81 return get_clk_frequency_khz(0)*1000/hsync_invperiod;
82 else
83 return 0;
84}
85
86static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend,
87 unsigned int address, unsigned long wait_time)
88{
89 unsigned long timer1 = 0, timer2, pmnc = 0;
90 int pos = 0;
91
92 if (wait_time && doSend) {
93 PMNC_GET(pmnc);
94 if (!(pmnc & 0x01))
95 PMNC_SET(0x01);
96
97 /* polling HSync */
98 corgi_ts->machinfo->wait_hsync();
99 /* get CCNT */
100 CCNT(timer1);
101 }
102
103 if (doRecive)
104 pos = corgi_ssp_ads7846_get();
105
106 if (doSend) {
107 int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
108 /* dummy command */
109 corgi_ssp_ads7846_put(cmd);
110 corgi_ssp_ads7846_get();
111
112 if (wait_time) {
113 /* Wait after HSync */
114 CCNT(timer2);
115 if (timer2-timer1 > wait_time) {
116 /* too slow - timeout, try again */
117 corgi_ts->machinfo->wait_hsync();
118 /* get CCNT */
119 CCNT(timer1);
120 /* Wait after HSync */
121 CCNT(timer2);
122 }
123 while (timer2 - timer1 < wait_time)
124 CCNT(timer2);
125 }
126 corgi_ssp_ads7846_put(cmd);
127 if (wait_time && !(pmnc & 0x01))
128 PMNC_SET(pmnc);
129 }
130 return pos;
131}
132
133static int read_xydata(struct corgi_ts *corgi_ts)
134{
135 unsigned int x, y, z1, z2;
136 unsigned long flags, wait_time;
137
138 /* critical section */
139 local_irq_save(flags);
140 corgi_ssp_ads7846_lock();
141 wait_time = calc_waittime(corgi_ts);
142
143 /* Y-axis */
144 sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
145
146 /* Y-axis */
147 sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
148
149 /* X-axis */
150 y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
151
152 /* Z1 */
153 x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
154
155 /* Z2 */
156 z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time);
157 z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time);
158
159 /* Power-Down Enable */
160 corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
161 corgi_ssp_ads7846_get();
162
163 corgi_ssp_ads7846_unlock();
164 local_irq_restore(flags);
165
166 if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
167 corgi_ts->tc.pressure = 0;
168 return 0;
169 }
170
171 corgi_ts->tc.x = x;
172 corgi_ts->tc.y = y;
173 corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
174 return 1;
175}
176
177static void new_data(struct corgi_ts *corgi_ts)
178{
179 struct input_dev *dev = corgi_ts->input;
180
181 if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
182 return;
183
184 if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
185 return;
186
187 input_report_abs(dev, ABS_X, corgi_ts->tc.x);
188 input_report_abs(dev, ABS_Y, corgi_ts->tc.y);
189 input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure);
190 input_report_key(dev, BTN_TOUCH, corgi_ts->pendown);
191 input_sync(dev);
192}
193
194static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
195{
196 if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
197 /* Disable Interrupt */
198 set_irq_type(corgi_ts->irq_gpio, IRQT_NOEDGE);
199 if (read_xydata(corgi_ts)) {
200 corgi_ts->pendown = 1;
201 new_data(corgi_ts);
202 }
203 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
204 } else {
205 if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
206 mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
207 corgi_ts->pendown++;
208 return;
209 }
210
211 if (corgi_ts->pendown) {
212 corgi_ts->tc.pressure = 0;
213 new_data(corgi_ts);
214 }
215
216 /* Enable Falling Edge */
217 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
218 corgi_ts->pendown = 0;
219 }
220}
221
222static void corgi_ts_timer(unsigned long data)
223{
224 struct corgi_ts *corgits_data = (struct corgi_ts *) data;
225
226 ts_interrupt_main(corgits_data, 1);
227}
228
229static irqreturn_t ts_interrupt(int irq, void *dev_id)
230{
231 struct corgi_ts *corgits_data = dev_id;
232
233 ts_interrupt_main(corgits_data, 0);
234 return IRQ_HANDLED;
235}
236
237#ifdef CONFIG_PM
238static int corgits_suspend(struct platform_device *dev, pm_message_t state)
239{
240 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
241
242 if (corgi_ts->pendown) {
243 del_timer_sync(&corgi_ts->timer);
244 corgi_ts->tc.pressure = 0;
245 new_data(corgi_ts);
246 corgi_ts->pendown = 0;
247 }
248 corgi_ts->power_mode = PWR_MODE_SUSPEND;
249
250 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
251
252 return 0;
253}
254
255static int corgits_resume(struct platform_device *dev)
256{
257 struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
258
259 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
260 /* Enable Falling Edge */
261 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
262 corgi_ts->power_mode = PWR_MODE_ACTIVE;
263
264 return 0;
265}
266#else
267#define corgits_suspend NULL
268#define corgits_resume NULL
269#endif
270
271static int __init corgits_probe(struct platform_device *pdev)
272{
273 struct corgi_ts *corgi_ts;
274 struct input_dev *input_dev;
275 int err = -ENOMEM;
276
277 corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
278 input_dev = input_allocate_device();
279 if (!corgi_ts || !input_dev)
280 goto fail1;
281
282 platform_set_drvdata(pdev, corgi_ts);
283
284 corgi_ts->machinfo = pdev->dev.platform_data;
285 corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
286
287 if (corgi_ts->irq_gpio < 0) {
288 err = -ENODEV;
289 goto fail1;
290 }
291
292 corgi_ts->input = input_dev;
293
294 init_timer(&corgi_ts->timer);
295 corgi_ts->timer.data = (unsigned long) corgi_ts;
296 corgi_ts->timer.function = corgi_ts_timer;
297
298 input_dev->name = "Corgi Touchscreen";
299 input_dev->phys = "corgits/input0";
300 input_dev->id.bustype = BUS_HOST;
301 input_dev->id.vendor = 0x0001;
302 input_dev->id.product = 0x0002;
303 input_dev->id.version = 0x0100;
304 input_dev->dev.parent = &pdev->dev;
305
306 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
307 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
308 input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
309 input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
310 input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
311
312 pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
313
314 /* Initiaize ADS7846 Difference Reference mode */
315 corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
316 mdelay(5);
317 corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
318 mdelay(5);
319 corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
320 mdelay(5);
321 corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
322 mdelay(5);
323
324 if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
325 err = -EBUSY;
326 goto fail1;
327 }
328
329 err = input_register_device(corgi_ts->input);
330 if (err)
331 goto fail2;
332
333 corgi_ts->power_mode = PWR_MODE_ACTIVE;
334
335 /* Enable Falling Edge */
336 set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
337
338 return 0;
339
340 fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
341 fail1: input_free_device(input_dev);
342 kfree(corgi_ts);
343 return err;
344}
345
346static int corgits_remove(struct platform_device *pdev)
347{
348 struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
349
350 free_irq(corgi_ts->irq_gpio, corgi_ts);
351 del_timer_sync(&corgi_ts->timer);
352 corgi_ts->machinfo->put_hsync();
353 input_unregister_device(corgi_ts->input);
354 kfree(corgi_ts);
355 return 0;
356}
357
358static struct platform_driver corgits_driver = {
359 .probe = corgits_probe,
360 .remove = corgits_remove,
361 .suspend = corgits_suspend,
362 .resume = corgits_resume,
363 .driver = {
364 .name = "corgi-ts",
365 .owner = THIS_MODULE,
366 },
367};
368
369static int __devinit corgits_init(void)
370{
371 return platform_driver_register(&corgits_driver);
372}
373
374static void __exit corgits_exit(void)
375{
376 platform_driver_unregister(&corgits_driver);
377}
378
379module_init(corgits_init);
380module_exit(corgits_exit);
381
382MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
383MODULE_DESCRIPTION("Corgi TouchScreen Driver");
384MODULE_LICENSE("GPL");
385MODULE_ALIAS("platform:corgi-ts");