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ae99ea56 PP |
1 | /* |
2 | * Synaptics NavPoint (PXA27x SSP/SPI) driver. | |
3 | * | |
4 | * Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com> | |
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 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/input/navpoint.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/pxa2xx_ssp.h> | |
23 | #include <linux/slab.h> | |
24 | ||
25 | /* | |
26 | * Synaptics Modular Embedded Protocol: Module Packet Format. | |
27 | * Module header byte 2:0 = Length (# bytes that follow) | |
28 | * Module header byte 4:3 = Control | |
29 | * Module header byte 7:5 = Module Address | |
30 | */ | |
31 | #define HEADER_LENGTH(byte) ((byte) & 0x07) | |
32 | #define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03) | |
33 | #define HEADER_ADDRESS(byte) ((byte) >> 5) | |
34 | ||
35 | struct navpoint { | |
36 | struct ssp_device *ssp; | |
37 | struct input_dev *input; | |
38 | struct device *dev; | |
39 | int gpio; | |
40 | int index; | |
41 | u8 data[1 + HEADER_LENGTH(0xff)]; | |
42 | }; | |
43 | ||
44 | /* | |
45 | * Initialization values for SSCR0_x, SSCR1_x, SSSR_x. | |
46 | */ | |
47 | static const u32 sscr0 = 0 | |
48 | | SSCR0_TUM /* TIM = 1; No TUR interrupts */ | |
49 | | SSCR0_RIM /* RIM = 1; No ROR interrupts */ | |
50 | | SSCR0_SSE /* SSE = 1; SSP enabled */ | |
51 | | SSCR0_Motorola /* FRF = 0; Motorola SPI */ | |
52 | | SSCR0_DataSize(16) /* DSS = 15; Data size = 16-bit */ | |
53 | ; | |
54 | static const u32 sscr1 = 0 | |
55 | | SSCR1_SCFR /* SCFR = 1; SSPSCLK only during transfers */ | |
56 | | SSCR1_SCLKDIR /* SCLKDIR = 1; Slave mode */ | |
57 | | SSCR1_SFRMDIR /* SFRMDIR = 1; Slave mode */ | |
58 | | SSCR1_RWOT /* RWOT = 1; Receive without transmit mode */ | |
59 | | SSCR1_RxTresh(1) /* RFT = 0; Receive FIFO threshold = 1 */ | |
60 | | SSCR1_SPH /* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */ | |
61 | | SSCR1_RIE /* RIE = 1; Receive FIFO interrupt enabled */ | |
62 | ; | |
63 | static const u32 sssr = 0 | |
64 | | SSSR_BCE /* BCE = 1; Clear BCE */ | |
65 | | SSSR_TUR /* TUR = 1; Clear TUR */ | |
66 | | SSSR_EOC /* EOC = 1; Clear EOC */ | |
67 | | SSSR_TINT /* TINT = 1; Clear TINT */ | |
68 | | SSSR_PINT /* PINT = 1; Clear PINT */ | |
69 | | SSSR_ROR /* ROR = 1; Clear ROR */ | |
70 | ; | |
71 | ||
72 | /* | |
73 | * MEP Query $22: Touchpad Coordinate Range Query is not supported by | |
74 | * the NavPoint module, so sampled values provide the default limits. | |
75 | */ | |
76 | #define NAVPOINT_X_MIN 1278 | |
77 | #define NAVPOINT_X_MAX 5340 | |
78 | #define NAVPOINT_Y_MIN 1572 | |
79 | #define NAVPOINT_Y_MAX 4396 | |
80 | #define NAVPOINT_PRESSURE_MIN 0 | |
81 | #define NAVPOINT_PRESSURE_MAX 255 | |
82 | ||
83 | static void navpoint_packet(struct navpoint *navpoint) | |
84 | { | |
85 | int finger; | |
86 | int gesture; | |
87 | int x, y, z; | |
88 | ||
89 | switch (navpoint->data[0]) { | |
90 | case 0xff: /* Garbage (packet?) between reset and Hello packet */ | |
91 | case 0x00: /* Module 0, NULL packet */ | |
92 | break; | |
93 | ||
94 | case 0x0e: /* Module 0, Absolute packet */ | |
95 | finger = (navpoint->data[1] & 0x01); | |
96 | gesture = (navpoint->data[1] & 0x02); | |
97 | x = ((navpoint->data[2] & 0x1f) << 8) | navpoint->data[3]; | |
98 | y = ((navpoint->data[4] & 0x1f) << 8) | navpoint->data[5]; | |
99 | z = navpoint->data[6]; | |
100 | input_report_key(navpoint->input, BTN_TOUCH, finger); | |
101 | input_report_abs(navpoint->input, ABS_X, x); | |
102 | input_report_abs(navpoint->input, ABS_Y, y); | |
103 | input_report_abs(navpoint->input, ABS_PRESSURE, z); | |
104 | input_report_key(navpoint->input, BTN_TOOL_FINGER, finger); | |
105 | input_report_key(navpoint->input, BTN_LEFT, gesture); | |
106 | input_sync(navpoint->input); | |
107 | break; | |
108 | ||
109 | case 0x19: /* Module 0, Hello packet */ | |
110 | if ((navpoint->data[1] & 0xf0) == 0x10) | |
111 | break; | |
112 | /* FALLTHROUGH */ | |
113 | default: | |
114 | dev_warn(navpoint->dev, | |
115 | "spurious packet: data=0x%02x,0x%02x,...\n", | |
116 | navpoint->data[0], navpoint->data[1]); | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | static irqreturn_t navpoint_irq(int irq, void *dev_id) | |
122 | { | |
123 | struct navpoint *navpoint = dev_id; | |
124 | struct ssp_device *ssp = navpoint->ssp; | |
125 | irqreturn_t ret = IRQ_NONE; | |
126 | u32 status; | |
127 | ||
128 | status = pxa_ssp_read_reg(ssp, SSSR); | |
129 | if (status & sssr) { | |
130 | dev_warn(navpoint->dev, | |
131 | "unexpected interrupt: status=0x%08x\n", status); | |
132 | pxa_ssp_write_reg(ssp, SSSR, (status & sssr)); | |
133 | ret = IRQ_HANDLED; | |
134 | } | |
135 | ||
136 | while (status & SSSR_RNE) { | |
137 | u32 data; | |
138 | ||
139 | data = pxa_ssp_read_reg(ssp, SSDR); | |
140 | navpoint->data[navpoint->index + 0] = (data >> 8); | |
141 | navpoint->data[navpoint->index + 1] = data; | |
142 | navpoint->index += 2; | |
143 | if (HEADER_LENGTH(navpoint->data[0]) < navpoint->index) { | |
144 | navpoint_packet(navpoint); | |
145 | navpoint->index = 0; | |
146 | } | |
147 | status = pxa_ssp_read_reg(ssp, SSSR); | |
148 | ret = IRQ_HANDLED; | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static void navpoint_up(struct navpoint *navpoint) | |
155 | { | |
156 | struct ssp_device *ssp = navpoint->ssp; | |
157 | int timeout; | |
158 | ||
159 | clk_prepare_enable(ssp->clk); | |
160 | ||
161 | pxa_ssp_write_reg(ssp, SSCR1, sscr1); | |
162 | pxa_ssp_write_reg(ssp, SSSR, sssr); | |
163 | pxa_ssp_write_reg(ssp, SSTO, 0); | |
164 | pxa_ssp_write_reg(ssp, SSCR0, sscr0); /* SSCR0_SSE written last */ | |
165 | ||
166 | /* Wait until SSP port is ready for slave clock operations */ | |
167 | for (timeout = 100; timeout != 0; --timeout) { | |
168 | if (!(pxa_ssp_read_reg(ssp, SSSR) & SSSR_CSS)) | |
169 | break; | |
170 | msleep(1); | |
171 | } | |
172 | ||
173 | if (timeout == 0) | |
174 | dev_err(navpoint->dev, | |
175 | "timeout waiting for SSSR[CSS] to clear\n"); | |
176 | ||
177 | if (gpio_is_valid(navpoint->gpio)) | |
178 | gpio_set_value(navpoint->gpio, 1); | |
179 | } | |
180 | ||
181 | static void navpoint_down(struct navpoint *navpoint) | |
182 | { | |
183 | struct ssp_device *ssp = navpoint->ssp; | |
184 | ||
185 | if (gpio_is_valid(navpoint->gpio)) | |
186 | gpio_set_value(navpoint->gpio, 0); | |
187 | ||
188 | pxa_ssp_write_reg(ssp, SSCR0, 0); | |
189 | ||
190 | clk_disable_unprepare(ssp->clk); | |
191 | } | |
192 | ||
193 | static int navpoint_open(struct input_dev *input) | |
194 | { | |
195 | struct navpoint *navpoint = input_get_drvdata(input); | |
196 | ||
197 | navpoint_up(navpoint); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static void navpoint_close(struct input_dev *input) | |
203 | { | |
204 | struct navpoint *navpoint = input_get_drvdata(input); | |
205 | ||
206 | navpoint_down(navpoint); | |
207 | } | |
208 | ||
209 | static int __devinit navpoint_probe(struct platform_device *pdev) | |
210 | { | |
211 | const struct navpoint_platform_data *pdata = | |
212 | dev_get_platdata(&pdev->dev); | |
213 | struct ssp_device *ssp; | |
214 | struct input_dev *input; | |
215 | struct navpoint *navpoint; | |
216 | int error; | |
217 | ||
218 | if (!pdata) { | |
219 | dev_err(&pdev->dev, "no platform data\n"); | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
223 | if (gpio_is_valid(pdata->gpio)) { | |
224 | error = gpio_request_one(pdata->gpio, GPIOF_OUT_INIT_LOW, | |
225 | "SYNAPTICS_ON"); | |
226 | if (error) | |
227 | return error; | |
228 | } | |
229 | ||
230 | ssp = pxa_ssp_request(pdata->port, pdev->name); | |
231 | if (!ssp) { | |
232 | error = -ENODEV; | |
233 | goto err_free_gpio; | |
234 | } | |
235 | ||
236 | /* HaRET does not disable devices before jumping into Linux */ | |
237 | if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) { | |
238 | pxa_ssp_write_reg(ssp, SSCR0, 0); | |
239 | dev_warn(&pdev->dev, "ssp%d already enabled\n", pdata->port); | |
240 | } | |
241 | ||
242 | navpoint = kzalloc(sizeof(*navpoint), GFP_KERNEL); | |
243 | input = input_allocate_device(); | |
244 | if (!navpoint || !input) { | |
245 | error = -ENOMEM; | |
246 | goto err_free_mem; | |
247 | } | |
248 | ||
249 | navpoint->ssp = ssp; | |
250 | navpoint->input = input; | |
251 | navpoint->dev = &pdev->dev; | |
252 | navpoint->gpio = pdata->gpio; | |
253 | ||
254 | input->name = pdev->name; | |
255 | input->dev.parent = &pdev->dev; | |
256 | ||
257 | __set_bit(EV_KEY, input->evbit); | |
258 | __set_bit(EV_ABS, input->evbit); | |
259 | __set_bit(BTN_LEFT, input->keybit); | |
260 | __set_bit(BTN_TOUCH, input->keybit); | |
261 | __set_bit(BTN_TOOL_FINGER, input->keybit); | |
262 | ||
263 | input_set_abs_params(input, ABS_X, | |
264 | NAVPOINT_X_MIN, NAVPOINT_X_MAX, 0, 0); | |
265 | input_set_abs_params(input, ABS_Y, | |
266 | NAVPOINT_Y_MIN, NAVPOINT_Y_MAX, 0, 0); | |
267 | input_set_abs_params(input, ABS_PRESSURE, | |
268 | NAVPOINT_PRESSURE_MIN, NAVPOINT_PRESSURE_MAX, | |
269 | 0, 0); | |
270 | ||
271 | input->open = navpoint_open; | |
272 | input->close = navpoint_close; | |
273 | ||
274 | input_set_drvdata(input, navpoint); | |
275 | ||
276 | error = request_irq(ssp->irq, navpoint_irq, 0, pdev->name, navpoint); | |
277 | if (error) | |
278 | goto err_free_mem; | |
279 | ||
280 | error = input_register_device(input); | |
281 | if (error) | |
282 | goto err_free_irq; | |
283 | ||
284 | platform_set_drvdata(pdev, navpoint); | |
285 | dev_dbg(&pdev->dev, "ssp%d, irq %d\n", pdata->port, ssp->irq); | |
286 | ||
287 | return 0; | |
288 | ||
289 | err_free_irq: | |
290 | free_irq(ssp->irq, &pdev->dev); | |
291 | err_free_mem: | |
292 | input_free_device(input); | |
293 | kfree(navpoint); | |
294 | pxa_ssp_free(ssp); | |
295 | err_free_gpio: | |
296 | if (gpio_is_valid(pdata->gpio)) | |
297 | gpio_free(pdata->gpio); | |
298 | ||
299 | return error; | |
300 | } | |
301 | ||
302 | static int __devexit navpoint_remove(struct platform_device *pdev) | |
303 | { | |
304 | const struct navpoint_platform_data *pdata = | |
305 | dev_get_platdata(&pdev->dev); | |
306 | struct navpoint *navpoint = platform_get_drvdata(pdev); | |
307 | struct ssp_device *ssp = navpoint->ssp; | |
308 | ||
309 | free_irq(ssp->irq, navpoint); | |
310 | ||
311 | input_unregister_device(navpoint->input); | |
312 | kfree(navpoint); | |
313 | ||
314 | pxa_ssp_free(ssp); | |
315 | ||
316 | if (gpio_is_valid(pdata->gpio)) | |
317 | gpio_free(pdata->gpio); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | #ifdef CONFIG_PM_SLEEP | |
323 | static int navpoint_suspend(struct device *dev) | |
324 | { | |
325 | struct platform_device *pdev = to_platform_device(dev); | |
326 | struct navpoint *navpoint = platform_get_drvdata(pdev); | |
327 | struct input_dev *input = navpoint->input; | |
328 | ||
329 | mutex_lock(&input->mutex); | |
330 | if (input->users) | |
331 | navpoint_down(navpoint); | |
332 | mutex_unlock(&input->mutex); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int navpoint_resume(struct device *dev) | |
338 | { | |
339 | struct platform_device *pdev = to_platform_device(dev); | |
340 | struct navpoint *navpoint = platform_get_drvdata(pdev); | |
341 | struct input_dev *input = navpoint->input; | |
342 | ||
343 | mutex_lock(&input->mutex); | |
344 | if (input->users) | |
345 | navpoint_up(navpoint); | |
346 | mutex_unlock(&input->mutex); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | #endif | |
351 | ||
352 | static SIMPLE_DEV_PM_OPS(navpoint_pm_ops, navpoint_suspend, navpoint_resume); | |
353 | ||
354 | static struct platform_driver navpoint_driver = { | |
355 | .probe = navpoint_probe, | |
356 | .remove = __devexit_p(navpoint_remove), | |
357 | .driver = { | |
358 | .name = "navpoint", | |
359 | .owner = THIS_MODULE, | |
360 | .pm = &navpoint_pm_ops, | |
361 | }, | |
362 | }; | |
363 | ||
364 | module_platform_driver(navpoint_driver); | |
365 | ||
366 | MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>"); | |
367 | MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver"); | |
368 | MODULE_LICENSE("GPL"); | |
369 | MODULE_ALIAS("platform:navpoint"); |