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path: root/drivers/input/touchscreen/atmel_tsadcc.c
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Diffstat (limited to 'drivers/input/touchscreen/atmel_tsadcc.c')
-rw-r--r--drivers/input/touchscreen/atmel_tsadcc.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/atmel_tsadcc.c b/drivers/input/touchscreen/atmel_tsadcc.c
new file mode 100644
index 000000000000..eee126b19e8b
--- /dev/null
+++ b/drivers/input/touchscreen/atmel_tsadcc.c
@@ -0,0 +1,332 @@
1/*
2 * Atmel Touch Screen Driver
3 *
4 * Copyright (c) 2008 ATMEL
5 * Copyright (c) 2008 Dan Liang
6 * Copyright (c) 2008 TimeSys Corporation
7 * Copyright (c) 2008 Justin Waters
8 *
9 * Based on touchscreen code from Atmel Corporation.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/input.h>
20#include <linux/slab.h>
21#include <linux/interrupt.h>
22#include <linux/clk.h>
23#include <linux/platform_device.h>
24#include <linux/io.h>
25
26/* Register definitions based on AT91SAM9RL64 preliminary draft datasheet */
27
28#define ATMEL_TSADCC_CR 0x00 /* Control register */
29#define ATMEL_TSADCC_SWRST (1 << 0) /* Software Reset*/
30#define ATMEL_TSADCC_START (1 << 1) /* Start conversion */
31
32#define ATMEL_TSADCC_MR 0x04 /* Mode register */
33#define ATMEL_TSADCC_TSAMOD (3 << 0) /* ADC mode */
34#define ATMEL_TSADCC_TSAMOD_ADC_ONLY_MODE (0x0) /* ADC Mode */
35#define ATMEL_TSADCC_TSAMOD_TS_ONLY_MODE (0x1) /* Touch Screen Only Mode */
36#define ATMEL_TSADCC_LOWRES (1 << 4) /* Resolution selection */
37#define ATMEL_TSADCC_SLEEP (1 << 5) /* Sleep mode */
38#define ATMEL_TSADCC_PENDET (1 << 6) /* Pen Detect selection */
39#define ATMEL_TSADCC_PRESCAL (0x3f << 8) /* Prescalar Rate Selection */
40#define ATMEL_TSADCC_STARTUP (0x7f << 16) /* Start Up time */
41#define ATMEL_TSADCC_SHTIM (0xf << 24) /* Sample & Hold time */
42#define ATMEL_TSADCC_PENDBC (0xf << 28) /* Pen Detect debouncing time */
43
44#define ATMEL_TSADCC_TRGR 0x08 /* Trigger register */
45#define ATMEL_TSADCC_TRGMOD (7 << 0) /* Trigger mode */
46#define ATMEL_TSADCC_TRGMOD_NONE (0 << 0)
47#define ATMEL_TSADCC_TRGMOD_EXT_RISING (1 << 0)
48#define ATMEL_TSADCC_TRGMOD_EXT_FALLING (2 << 0)
49#define ATMEL_TSADCC_TRGMOD_EXT_ANY (3 << 0)
50#define ATMEL_TSADCC_TRGMOD_PENDET (4 << 0)
51#define ATMEL_TSADCC_TRGMOD_PERIOD (5 << 0)
52#define ATMEL_TSADCC_TRGMOD_CONTINUOUS (6 << 0)
53#define ATMEL_TSADCC_TRGPER (0xffff << 16) /* Trigger period */
54
55#define ATMEL_TSADCC_TSR 0x0C /* Touch Screen register */
56#define ATMEL_TSADCC_TSFREQ (0xf << 0) /* TS Frequency in Interleaved mode */
57#define ATMEL_TSADCC_TSSHTIM (0xf << 24) /* Sample & Hold time */
58
59#define ATMEL_TSADCC_CHER 0x10 /* Channel Enable register */
60#define ATMEL_TSADCC_CHDR 0x14 /* Channel Disable register */
61#define ATMEL_TSADCC_CHSR 0x18 /* Channel Status register */
62#define ATMEL_TSADCC_CH(n) (1 << (n)) /* Channel number */
63
64#define ATMEL_TSADCC_SR 0x1C /* Status register */
65#define ATMEL_TSADCC_EOC(n) (1 << ((n)+0)) /* End of conversion for channel N */
66#define ATMEL_TSADCC_OVRE(n) (1 << ((n)+8)) /* Overrun error for channel N */
67#define ATMEL_TSADCC_DRDY (1 << 16) /* Data Ready */
68#define ATMEL_TSADCC_GOVRE (1 << 17) /* General Overrun Error */
69#define ATMEL_TSADCC_ENDRX (1 << 18) /* End of RX Buffer */
70#define ATMEL_TSADCC_RXBUFF (1 << 19) /* TX Buffer full */
71#define ATMEL_TSADCC_PENCNT (1 << 20) /* Pen contact */
72#define ATMEL_TSADCC_NOCNT (1 << 21) /* No contact */
73
74#define ATMEL_TSADCC_LCDR 0x20 /* Last Converted Data register */
75#define ATMEL_TSADCC_DATA (0x3ff << 0) /* Channel data */
76
77#define ATMEL_TSADCC_IER 0x24 /* Interrupt Enable register */
78#define ATMEL_TSADCC_IDR 0x28 /* Interrupt Disable register */
79#define ATMEL_TSADCC_IMR 0x2C /* Interrupt Mask register */
80#define ATMEL_TSADCC_CDR0 0x30 /* Channel Data 0 */
81#define ATMEL_TSADCC_CDR1 0x34 /* Channel Data 1 */
82#define ATMEL_TSADCC_CDR2 0x38 /* Channel Data 2 */
83#define ATMEL_TSADCC_CDR3 0x3C /* Channel Data 3 */
84#define ATMEL_TSADCC_CDR4 0x40 /* Channel Data 4 */
85#define ATMEL_TSADCC_CDR5 0x44 /* Channel Data 5 */
86
87#define ADC_CLOCK 1000000
88
89struct atmel_tsadcc {
90 struct input_dev *input;
91 char phys[32];
92 struct clk *clk;
93 int irq;
94};
95
96static void __iomem *tsc_base;
97
98#define atmel_tsadcc_read(reg) __raw_readl(tsc_base + (reg))
99#define atmel_tsadcc_write(reg, val) __raw_writel((val), tsc_base + (reg))
100
101static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
102{
103 struct input_dev *input_dev = ((struct atmel_tsadcc *)dev)->input;
104
105 unsigned int absx;
106 unsigned int absy;
107 unsigned int status;
108 unsigned int reg;
109
110 status = atmel_tsadcc_read(ATMEL_TSADCC_SR);
111 status &= atmel_tsadcc_read(ATMEL_TSADCC_IMR);
112
113 if (status & ATMEL_TSADCC_NOCNT) {
114 /* Contact lost */
115 reg = atmel_tsadcc_read(ATMEL_TSADCC_MR) | ATMEL_TSADCC_PENDBC;
116
117 atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
118 atmel_tsadcc_write(ATMEL_TSADCC_TRGR, ATMEL_TSADCC_TRGMOD_NONE);
119 atmel_tsadcc_write(ATMEL_TSADCC_IDR,
120 ATMEL_TSADCC_EOC(3) | ATMEL_TSADCC_NOCNT);
121 atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
122
123 input_report_key(input_dev, BTN_TOUCH, 0);
124 input_sync(input_dev);
125
126 } else if (status & ATMEL_TSADCC_PENCNT) {
127 /* Pen detected */
128 reg = atmel_tsadcc_read(ATMEL_TSADCC_MR);
129 reg &= ~ATMEL_TSADCC_PENDBC;
130
131 atmel_tsadcc_write(ATMEL_TSADCC_IDR, ATMEL_TSADCC_PENCNT);
132 atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
133 atmel_tsadcc_write(ATMEL_TSADCC_IER,
134 ATMEL_TSADCC_EOC(3) | ATMEL_TSADCC_NOCNT);
135 atmel_tsadcc_write(ATMEL_TSADCC_TRGR,
136 ATMEL_TSADCC_TRGMOD_PERIOD | (0x0FFF << 16));
137
138 } else if (status & ATMEL_TSADCC_EOC(3)) {
139 /* Conversion finished */
140
141 absx = atmel_tsadcc_read(ATMEL_TSADCC_CDR3) << 10;
142 absx /= atmel_tsadcc_read(ATMEL_TSADCC_CDR2);
143
144 absy = atmel_tsadcc_read(ATMEL_TSADCC_CDR1) << 10;
145 absy /= atmel_tsadcc_read(ATMEL_TSADCC_CDR0);
146
147 input_report_abs(input_dev, ABS_X, absx);
148 input_report_abs(input_dev, ABS_Y, absy);
149 input_report_key(input_dev, BTN_TOUCH, 1);
150 input_sync(input_dev);
151 }
152
153 return IRQ_HANDLED;
154}
155
156/*
157 * The functions for inserting/removing us as a module.
158 */
159
160static int __devinit atmel_tsadcc_probe(struct platform_device *pdev)
161{
162 struct atmel_tsadcc *ts_dev;
163 struct input_dev *input_dev;
164 struct resource *res;
165 int err = 0;
166 unsigned int prsc;
167 unsigned int reg;
168
169 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
170 if (!res) {
171 dev_err(&pdev->dev, "no mmio resource defined.\n");
172 return -ENXIO;
173 }
174
175 /* Allocate memory for device */
176 ts_dev = kzalloc(sizeof(struct atmel_tsadcc), GFP_KERNEL);
177 if (!ts_dev) {
178 dev_err(&pdev->dev, "failed to allocate memory.\n");
179 return -ENOMEM;
180 }
181 platform_set_drvdata(pdev, ts_dev);
182
183 input_dev = input_allocate_device();
184 if (!input_dev) {
185 dev_err(&pdev->dev, "failed to allocate input device.\n");
186 err = -EBUSY;
187 goto err_free_mem;
188 }
189
190 ts_dev->irq = platform_get_irq(pdev, 0);
191 if (ts_dev->irq < 0) {
192 dev_err(&pdev->dev, "no irq ID is designated.\n");
193 err = -ENODEV;
194 goto err_free_dev;
195 }
196
197 if (!request_mem_region(res->start, res->end - res->start + 1,
198 "atmel tsadcc regs")) {
199 dev_err(&pdev->dev, "resources is unavailable.\n");
200 err = -EBUSY;
201 goto err_free_dev;
202 }
203
204 tsc_base = ioremap(res->start, res->end - res->start + 1);
205 if (!tsc_base) {
206 dev_err(&pdev->dev, "failed to map registers.\n");
207 err = -ENOMEM;
208 goto err_release_mem;
209 }
210
211 err = request_irq(ts_dev->irq, atmel_tsadcc_interrupt, IRQF_DISABLED,
212 pdev->dev.driver->name, ts_dev);
213 if (err) {
214 dev_err(&pdev->dev, "failed to allocate irq.\n");
215 goto err_unmap_regs;
216 }
217
218 ts_dev->clk = clk_get(&pdev->dev, "tsc_clk");
219 if (IS_ERR(ts_dev->clk)) {
220 dev_err(&pdev->dev, "failed to get ts_clk\n");
221 err = PTR_ERR(ts_dev->clk);
222 goto err_free_irq;
223 }
224
225 ts_dev->input = input_dev;
226
227 snprintf(ts_dev->phys, sizeof(ts_dev->phys),
228 "%s/input0", pdev->dev.bus_id);
229
230 input_dev->name = "atmel touch screen controller";
231 input_dev->phys = ts_dev->phys;
232 input_dev->dev.parent = &pdev->dev;
233
234 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
235 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
236
237 input_set_abs_params(input_dev, ABS_X, 0, 0x3FF, 0, 0);
238 input_set_abs_params(input_dev, ABS_Y, 0, 0x3FF, 0, 0);
239
240 /* clk_enable() always returns 0, no need to check it */
241 clk_enable(ts_dev->clk);
242
243 prsc = clk_get_rate(ts_dev->clk);
244 dev_info(&pdev->dev, "Master clock is set at: %d Hz\n", prsc);
245
246 prsc = prsc / ADC_CLOCK / 2 - 1;
247
248 reg = ATMEL_TSADCC_TSAMOD_TS_ONLY_MODE |
249 ((0x00 << 5) & ATMEL_TSADCC_SLEEP) | /* Normal Mode */
250 ((0x01 << 6) & ATMEL_TSADCC_PENDET) | /* Enable Pen Detect */
251 ((prsc << 8) & ATMEL_TSADCC_PRESCAL) | /* PRESCAL */
252 ((0x13 << 16) & ATMEL_TSADCC_STARTUP) | /* STARTUP */
253 ((0x0F << 28) & ATMEL_TSADCC_PENDBC); /* PENDBC */
254
255 atmel_tsadcc_write(ATMEL_TSADCC_CR, ATMEL_TSADCC_SWRST);
256 atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
257 atmel_tsadcc_write(ATMEL_TSADCC_TRGR, ATMEL_TSADCC_TRGMOD_NONE);
258 atmel_tsadcc_write(ATMEL_TSADCC_TSR, (0x3 << 24) & ATMEL_TSADCC_TSSHTIM);
259
260 atmel_tsadcc_read(ATMEL_TSADCC_SR);
261 atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
262
263 /* All went ok, so register to the input system */
264 err = input_register_device(input_dev);
265 if (err)
266 goto err_fail;
267
268 return 0;
269
270err_fail:
271 clk_disable(ts_dev->clk);
272 clk_put(ts_dev->clk);
273err_free_irq:
274 free_irq(ts_dev->irq, ts_dev);
275err_unmap_regs:
276 iounmap(tsc_base);
277err_release_mem:
278 release_mem_region(res->start, res->end - res->start + 1);
279err_free_dev:
280 input_free_device(ts_dev->input);
281err_free_mem:
282 kfree(ts_dev);
283 return err;
284}
285
286static int __devexit atmel_tsadcc_remove(struct platform_device *pdev)
287{
288 struct atmel_tsadcc *ts_dev = dev_get_drvdata(&pdev->dev);
289 struct resource *res;
290
291 free_irq(ts_dev->irq, ts_dev);
292
293 input_unregister_device(ts_dev->input);
294
295 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
296 iounmap(tsc_base);
297 release_mem_region(res->start, res->end - res->start + 1);
298
299 clk_disable(ts_dev->clk);
300 clk_put(ts_dev->clk);
301
302 kfree(ts_dev);
303
304 return 0;
305}
306
307static struct platform_driver atmel_tsadcc_driver = {
308 .probe = atmel_tsadcc_probe,
309 .remove = __devexit_p(atmel_tsadcc_remove),
310 .driver = {
311 .name = "atmel_tsadcc",
312 },
313};
314
315static int __init atmel_tsadcc_init(void)
316{
317 return platform_driver_register(&atmel_tsadcc_driver);
318}
319
320static void __exit atmel_tsadcc_exit(void)
321{
322 platform_driver_unregister(&atmel_tsadcc_driver);
323}
324
325module_init(atmel_tsadcc_init);
326module_exit(atmel_tsadcc_exit);
327
328
329MODULE_LICENSE("GPL");
330MODULE_DESCRIPTION("Atmel TouchScreen Driver");
331MODULE_AUTHOR("Dan Liang <dan.liang@atmel.com>");
332
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 13:06:34 -0500