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8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/clk.h>
12#include <linux/delay.h>
13#include <linux/gpio.h>
14#include <linux/input.h>
15#include <linux/input/navpoint.h>
16#include <linux/interrupt.h>
17#include <linux/mutex.h>
18#include <linux/pxa2xx_ssp.h>
19#include <linux/slab.h>
20
21
22
23
24
25
26
27#define HEADER_LENGTH(byte) ((byte) & 0x07)
28#define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03)
29#define HEADER_ADDRESS(byte) ((byte) >> 5)
30
31struct navpoint {
32 struct ssp_device *ssp;
33 struct input_dev *input;
34 struct device *dev;
35 int gpio;
36 int index;
37 u8 data[1 + HEADER_LENGTH(0xff)];
38};
39
40
41
42
43static const u32 sscr0 = 0
44 | SSCR0_TUM
45 | SSCR0_RIM
46 | SSCR0_SSE
47 | SSCR0_Motorola
48 | SSCR0_DataSize(16)
49 ;
50static const u32 sscr1 = 0
51 | SSCR1_SCFR
52 | SSCR1_SCLKDIR
53 | SSCR1_SFRMDIR
54 | SSCR1_RWOT
55 | SSCR1_RxTresh(1)
56 | SSCR1_SPH
57 | SSCR1_RIE
58 ;
59static const u32 sssr = 0
60 | SSSR_BCE
61 | SSSR_TUR
62 | SSSR_EOC
63 | SSSR_TINT
64 | SSSR_PINT
65 | SSSR_ROR
66 ;
67
68
69
70
71
72#define NAVPOINT_X_MIN 1278
73#define NAVPOINT_X_MAX 5340
74#define NAVPOINT_Y_MIN 1572
75#define NAVPOINT_Y_MAX 4396
76#define NAVPOINT_PRESSURE_MIN 0
77#define NAVPOINT_PRESSURE_MAX 255
78
79static void navpoint_packet(struct navpoint *navpoint)
80{
81 int finger;
82 int gesture;
83 int x, y, z;
84
85 switch (navpoint->data[0]) {
86 case 0xff:
87 case 0x00:
88 break;
89
90 case 0x0e:
91 finger = (navpoint->data[1] & 0x01);
92 gesture = (navpoint->data[1] & 0x02);
93 x = ((navpoint->data[2] & 0x1f) << 8) | navpoint->data[3];
94 y = ((navpoint->data[4] & 0x1f) << 8) | navpoint->data[5];
95 z = navpoint->data[6];
96 input_report_key(navpoint->input, BTN_TOUCH, finger);
97 input_report_abs(navpoint->input, ABS_X, x);
98 input_report_abs(navpoint->input, ABS_Y, y);
99 input_report_abs(navpoint->input, ABS_PRESSURE, z);
100 input_report_key(navpoint->input, BTN_TOOL_FINGER, finger);
101 input_report_key(navpoint->input, BTN_LEFT, gesture);
102 input_sync(navpoint->input);
103 break;
104
105 case 0x19:
106 if ((navpoint->data[1] & 0xf0) == 0x10)
107 break;
108
109 default:
110 dev_warn(navpoint->dev,
111 "spurious packet: data=0x%02x,0x%02x,...\n",
112 navpoint->data[0], navpoint->data[1]);
113 break;
114 }
115}
116
117static irqreturn_t navpoint_irq(int irq, void *dev_id)
118{
119 struct navpoint *navpoint = dev_id;
120 struct ssp_device *ssp = navpoint->ssp;
121 irqreturn_t ret = IRQ_NONE;
122 u32 status;
123
124 status = pxa_ssp_read_reg(ssp, SSSR);
125 if (status & sssr) {
126 dev_warn(navpoint->dev,
127 "unexpected interrupt: status=0x%08x\n", status);
128 pxa_ssp_write_reg(ssp, SSSR, (status & sssr));
129 ret = IRQ_HANDLED;
130 }
131
132 while (status & SSSR_RNE) {
133 u32 data;
134
135 data = pxa_ssp_read_reg(ssp, SSDR);
136 navpoint->data[navpoint->index + 0] = (data >> 8);
137 navpoint->data[navpoint->index + 1] = data;
138 navpoint->index += 2;
139 if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) {
140 navpoint_packet(navpoint);
141 navpoint->index = 0;
142 }
143 status = pxa_ssp_read_reg(ssp, SSSR);
144 ret = IRQ_HANDLED;
145 }
146
147 return ret;
148}
149
150static void navpoint_up(struct navpoint *navpoint)
151{
152 struct ssp_device *ssp = navpoint->ssp;
153 int timeout;
154
155 clk_prepare_enable(ssp->clk);
156
157 pxa_ssp_write_reg(ssp, SSCR1, sscr1);
158 pxa_ssp_write_reg(ssp, SSSR, sssr);
159 pxa_ssp_write_reg(ssp, SSTO, 0);
160 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
161
162
163 for (timeout = 100; timeout != 0; --timeout) {
164 if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS))
165 break;
166 msleep(1);
167 }
168
169 if (timeout == 0)
170 dev_err(navpoint->dev,
171 "timeout waiting for SSSR[CSS] to clear\n");
172
173 if (gpio_is_valid(navpoint->gpio))
174 gpio_set_value(navpoint->gpio, 1);
175}
176
177static void navpoint_down(struct navpoint *navpoint)
178{
179 struct ssp_device *ssp = navpoint->ssp;
180
181 if (gpio_is_valid(navpoint->gpio))
182 gpio_set_value(navpoint->gpio, 0);
183
184 pxa_ssp_write_reg(ssp, SSCR0, 0);
185
186 clk_disable_unprepare(ssp->clk);
187}
188
189static int navpoint_open(struct input_dev *input)
190{
191 struct navpoint *navpoint = input_get_drvdata(input);
192
193 navpoint_up(navpoint);
194
195 return 0;
196}
197
198static void navpoint_close(struct input_dev *input)
199{
200 struct navpoint *navpoint = input_get_drvdata(input);
201
202 navpoint_down(navpoint);
203}
204
205static int navpoint_probe(struct platform_device *pdev)
206{
207 const struct navpoint_platform_data *pdata =
208 dev_get_platdata(&pdev->dev);
209 struct ssp_device *ssp;
210 struct input_dev *input;
211 struct navpoint *navpoint;
212 int error;
213
214 if (!pdata) {
215 dev_err(&pdev->dev, "no platform data\n");
216 return -EINVAL;
217 }
218
219 if (gpio_is_valid(pdata->gpio)) {
220 error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW,
221 "SYNAPTICS_ON");
222 if (error)
223 return error;
224 }
225
226 ssp = pxa_ssp_request(pdata->port, pdev->name);
227 if (!ssp) {
228 error = -ENODEV;
229 goto err_free_gpio;
230 }
231
232
233 if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
234 pxa_ssp_write_reg(ssp, SSCR0, 0);
235 dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port);
236 }
237
238 navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL);
239 input = input_allocate_device();
240 if (!navpoint || !input) {
241 error = -ENOMEM;
242 goto err_free_mem;
243 }
244
245 navpoint->ssp = ssp;
246 navpoint->input = input;
247 navpoint->dev = &pdev->dev;
248 navpoint->gpio = pdata->gpio;
249
250 input->name = pdev->name;
251 input->dev.parent = &pdev->dev;
252
253 __set_bit(EV_KEY, input->evbit);
254 __set_bit(EV_ABS, input->evbit);
255 __set_bit(BTN_LEFT, input->keybit);
256 __set_bit(BTN_TOUCH, input->keybit);
257 __set_bit(BTN_TOOL_FINGER, input->keybit);
258
259 input_set_abs_params(input, ABS_X,
260 NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0);
261 input_set_abs_params(input, ABS_Y,
262 NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0);
263 input_set_abs_params(input, ABS_PRESSURE,
264 NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX,
265 0, 0);
266
267 input->open = navpoint_open;
268 input->close = navpoint_close;
269
270 input_set_drvdata(input, navpoint);
271
272 error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint);
273 if (error)
274 goto err_free_mem;
275
276 error = input_register_device(input);
277 if (error)
278 goto err_free_irq;
279
280 platform_set_drvdata(pdev, navpoint);
281 dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq);
282
283 return 0;
284
285err_free_irq:
286 free_irq(ssp->irq, navpoint);
287err_free_mem:
288 input_free_device(input);
289 kfree(navpoint);
290 pxa_ssp_free(ssp);
291err_free_gpio:
292 if (gpio_is_valid(pdata->gpio))
293 gpio_free(pdata->gpio);
294
295 return error;
296}
297
298static int navpoint_remove(struct platform_device *pdev)
299{
300 const struct navpoint_platform_data *pdata =
301 dev_get_platdata(&pdev->dev);
302 struct navpoint *navpoint = platform_get_drvdata(pdev);
303 struct ssp_device *ssp = navpoint->ssp;
304
305 free_irq(ssp->irq, navpoint);
306
307 input_unregister_device(navpoint->input);
308 kfree(navpoint);
309
310 pxa_ssp_free(ssp);
311
312 if (gpio_is_valid(pdata->gpio))
313 gpio_free(pdata->gpio);
314
315 return 0;
316}
317
318static int __maybe_unused navpoint_suspend(struct device *dev)
319{
320 struct platform_device *pdev = to_platform_device(dev);
321 struct navpoint *navpoint = platform_get_drvdata(pdev);
322 struct input_dev *input = navpoint->input;
323
324 mutex_lock(&input->mutex);
325 if (input->users)
326 navpoint_down(navpoint);
327 mutex_unlock(&input->mutex);
328
329 return 0;
330}
331
332static int __maybe_unused navpoint_resume(struct device *dev)
333{
334 struct platform_device *pdev = to_platform_device(dev);
335 struct navpoint *navpoint = platform_get_drvdata(pdev);
336 struct input_dev *input = navpoint->input;
337
338 mutex_lock(&input->mutex);
339 if (input->users)
340 navpoint_up(navpoint);
341 mutex_unlock(&input->mutex);
342
343 return 0;
344}
345
346static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume);
347
348static struct platform_driver navpoint_driver = {
349 .probe = navpoint_probe,
350 .remove = navpoint_remove,
351 .driver = {
352 .name = "navpoint",
353 .pm = &navpoint_pm_ops,
354 },
355};
356
357module_platform_driver(navpoint_driver);
358
359MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
360MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver");
361MODULE_LICENSE("GPL");
362MODULE_ALIAS("platform:navpoint");
363
