summaryrefslogtreecommitdiffstats
path: root/drivers/input/rmi4/rmi_f30.c
blob: a90dad1d9ac785b5e3573cd349c95917869ef45d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2012-2016 Synaptics Incorporated
 */

#include <linux/kernel.h>
#include <linux/rmi.h>
#include <linux/input.h>
#include <linux/slab.h>
#include "rmi_driver.h"

#define RMI_F30_QUERY_SIZE			2

/* Defs for Query 0 */
#define RMI_F30_EXTENDED_PATTERNS		0x01
#define RMI_F30_HAS_MAPPABLE_BUTTONS		BIT(1)
#define RMI_F30_HAS_LED				BIT(2)
#define RMI_F30_HAS_GPIO			BIT(3)
#define RMI_F30_HAS_HAPTIC			BIT(4)
#define RMI_F30_HAS_GPIO_DRV_CTL		BIT(5)
#define RMI_F30_HAS_MECH_MOUSE_BTNS		BIT(6)

/* Defs for Query 1 */
#define RMI_F30_GPIO_LED_COUNT			0x1F

/* Defs for Control Registers */
#define RMI_F30_CTRL_1_GPIO_DEBOUNCE		0x01
#define RMI_F30_CTRL_1_HALT			BIT(4)
#define RMI_F30_CTRL_1_HALTED			BIT(5)
#define RMI_F30_CTRL_10_NUM_MECH_MOUSE_BTNS	0x03

#define RMI_F30_CTRL_MAX_REGS		32
#define RMI_F30_CTRL_MAX_BYTES		DIV_ROUND_UP(RMI_F30_CTRL_MAX_REGS, 8)
#define RMI_F30_CTRL_MAX_REG_BLOCKS	11

#define RMI_F30_CTRL_REGS_MAX_SIZE (RMI_F30_CTRL_MAX_BYTES		\
					+ 1				\
					+ RMI_F30_CTRL_MAX_BYTES	\
					+ RMI_F30_CTRL_MAX_BYTES	\
					+ RMI_F30_CTRL_MAX_BYTES	\
					+ 6				\
					+ RMI_F30_CTRL_MAX_REGS		\
					+ RMI_F30_CTRL_MAX_REGS		\
					+ RMI_F30_CTRL_MAX_BYTES	\
					+ 1				\
					+ 1)

#define TRACKSTICK_RANGE_START		3
#define TRACKSTICK_RANGE_END		6

struct rmi_f30_ctrl_data {
	int address;
	int length;
	u8 *regs;
};

struct f30_data {
	/* Query Data */
	bool has_extended_pattern;
	bool has_mappable_buttons;
	bool has_led;
	bool has_gpio;
	bool has_haptic;
	bool has_gpio_driver_control;
	bool has_mech_mouse_btns;
	u8 gpioled_count;

	u8 register_count;

	/* Control Register Data */
	struct rmi_f30_ctrl_data ctrl[RMI_F30_CTRL_MAX_REG_BLOCKS];
	u8 ctrl_regs[RMI_F30_CTRL_REGS_MAX_SIZE];
	u32 ctrl_regs_size;

	u8 data_regs[RMI_F30_CTRL_MAX_BYTES];
	u16 *gpioled_key_map;

	struct input_dev *input;

	struct rmi_function *f03;
	bool trackstick_buttons;
};

static int rmi_f30_read_control_parameters(struct rmi_function *fn,
						struct f30_data *f30)
{
	int error;

	error = rmi_read_block(fn->rmi_dev, fn->fd.control_base_addr,
			       f30->ctrl_regs, f30->ctrl_regs_size);
	if (error) {
		dev_err(&fn->dev,
			"%s: Could not read control registers at 0x%x: %d\n",
			__func__, fn->fd.control_base_addr, error);
		return error;
	}

	return 0;
}

static void rmi_f30_report_button(struct rmi_function *fn,
				  struct f30_data *f30, unsigned int button)
{
	unsigned int reg_num = button >> 3;
	unsigned int bit_num = button & 0x07;
	u16 key_code = f30->gpioled_key_map[button];
	bool key_down = !(f30->data_regs[reg_num] & BIT(bit_num));

	if (f30->trackstick_buttons &&
	    button >= TRACKSTICK_RANGE_START &&
	    button <= TRACKSTICK_RANGE_END) {
		rmi_f03_overwrite_button(f30->f03, key_code, key_down);
	} else {
		rmi_dbg(RMI_DEBUG_FN, &fn->dev,
			"%s: call input report key (0x%04x) value (0x%02x)",
			__func__, key_code, key_down);

		input_report_key(f30->input, key_code, key_down);
	}
}

static irqreturn_t rmi_f30_attention(int irq, void *ctx)
{
	struct rmi_function *fn = ctx;
	struct f30_data *f30 = dev_get_drvdata(&fn->dev);
	struct rmi_driver_data *drvdata = dev_get_drvdata(&fn->rmi_dev->dev);
	int error;
	int i;

	/* Read the gpi led data. */
	if (drvdata->attn_data.data) {
		if (drvdata->attn_data.size < f30->register_count) {
			dev_warn(&fn->dev,
				 "F30 interrupted, but data is missing\n");
			return IRQ_HANDLED;
		}
		memcpy(f30->data_regs, drvdata->attn_data.data,
			f30->register_count);
		drvdata->attn_data.data += f30->register_count;
		drvdata->attn_data.size -= f30->register_count;
	} else {
		error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr,
				       f30->data_regs, f30->register_count);
		if (error) {
			dev_err(&fn->dev,
				"%s: Failed to read F30 data registers: %d\n",
				__func__, error);
			return IRQ_RETVAL(error);
		}
	}

	if (f30->has_gpio) {
		for (i = 0; i < f30->gpioled_count; i++)
			if (f30->gpioled_key_map[i] != KEY_RESERVED)
				rmi_f30_report_button(fn, f30, i);
		if (f30->trackstick_buttons)
			rmi_f03_commit_buttons(f30->f03);
	}

	return IRQ_HANDLED;
}

static int rmi_f30_config(struct rmi_function *fn)
{
	struct f30_data *f30 = dev_get_drvdata(&fn->dev);
	struct rmi_driver *drv = fn->rmi_dev->driver;
	const struct rmi_device_platform_data *pdata =
				rmi_get_platform_data(fn->rmi_dev);
	int error;

	/* can happen if f30_data.disable is set */
	if (!f30)
		return 0;

	if (pdata->f30_data.trackstick_buttons) {
		/* Try [re-]establish link to F03. */
		f30->f03 = rmi_find_function(fn->rmi_dev, 0x03);
		f30->trackstick_buttons = f30->f03 != NULL;
	}

	if (pdata->f30_data.disable) {
		drv->clear_irq_bits(fn->rmi_dev, fn->irq_mask);
	} else {
		/* Write Control Register values back to device */
		error = rmi_write_block(fn->rmi_dev, fn->fd.control_base_addr,
					f30->ctrl_regs, f30->ctrl_regs_size);
		if (error) {
			dev_err(&fn->dev,
				"%s: Could not write control registers at 0x%x: %d\n",
				__func__, fn->fd.control_base_addr, error);
			return error;
		}

		drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
	}

	return 0;
}

static void rmi_f30_set_ctrl_data(struct rmi_f30_ctrl_data *ctrl,
				  int *ctrl_addr, int len, u8 **reg)
{
	ctrl->address = *ctrl_addr;
	ctrl->length = len;
	ctrl->regs = *reg;
	*ctrl_addr += len;
	*reg += len;
}

static bool rmi_f30_is_valid_button(int button, struct rmi_f30_ctrl_data *ctrl)
{
	int byte_position = button >> 3;
	int bit_position = button & 0x07;

	/*
	 * ctrl2 -> dir == 0 -> input mode
	 * ctrl3 -> data == 1 -> actual button
	 */
	return !(ctrl[2].regs[byte_position] & BIT(bit_position)) &&
		(ctrl[3].regs[byte_position] & BIT(bit_position));
}

static int rmi_f30_map_gpios(struct rmi_function *fn,
			     struct f30_data *f30)
{
	const struct rmi_device_platform_data *pdata =
					rmi_get_platform_data(fn->rmi_dev);
	struct input_dev *input = f30->input;
	unsigned int button = BTN_LEFT;
	unsigned int trackstick_button = BTN_LEFT;
	bool button_mapped = false;
	int i;
	int button_count = min_t(u8, f30->gpioled_count, TRACKSTICK_RANGE_END);

	f30->gpioled_key_map = devm_kcalloc(&fn->dev,
					    button_count,
					    sizeof(f30->gpioled_key_map[0]),
					    GFP_KERNEL);
	if (!f30->gpioled_key_map) {
		dev_err(&fn->dev, "Failed to allocate gpioled map memory.\n");
		return -ENOMEM;
	}

	for (i = 0; i < button_count; i++) {
		if (!rmi_f30_is_valid_button(i, f30->ctrl))
			continue;

		if (pdata->f30_data.trackstick_buttons &&
		    i >= TRACKSTICK_RANGE_START && i < TRACKSTICK_RANGE_END) {
			f30->gpioled_key_map[i] = trackstick_button++;
		} else if (!pdata->f30_data.buttonpad || !button_mapped) {
			f30->gpioled_key_map[i] = button;
			input_set_capability(input, EV_KEY, button++);
			button_mapped = true;
		}
	}

	input->keycode = f30->gpioled_key_map;
	input->keycodesize = sizeof(f30->gpioled_key_map[0]);
	input->keycodemax = f30->gpioled_count;

	/*
	 * Buttonpad could be also inferred from f30->has_mech_mouse_btns,
	 * but I am not sure, so use only the pdata info and the number of
	 * mapped buttons.
	 */
	if (pdata->f30_data.buttonpad || (button - BTN_LEFT == 1))
		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

	return 0;
}

static int rmi_f30_initialize(struct rmi_function *fn, struct f30_data *f30)
{
	u8 *ctrl_reg = f30->ctrl_regs;
	int control_address = fn->fd.control_base_addr;
	u8 buf[RMI_F30_QUERY_SIZE];
	int error;

	error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr,
			       buf, RMI_F30_QUERY_SIZE);
	if (error) {
		dev_err(&fn->dev, "Failed to read query register\n");
		return error;
	}

	f30->has_extended_pattern = buf[0] & RMI_F30_EXTENDED_PATTERNS;
	f30->has_mappable_buttons = buf[0] & RMI_F30_HAS_MAPPABLE_BUTTONS;
	f30->has_led = buf[0] & RMI_F30_HAS_LED;
	f30->has_gpio = buf[0] & RMI_F30_HAS_GPIO;
	f30->has_haptic = buf[0] & RMI_F30_HAS_HAPTIC;
	f30->has_gpio_driver_control = buf[0] & RMI_F30_HAS_GPIO_DRV_CTL;
	f30->has_mech_mouse_btns = buf[0] & RMI_F30_HAS_MECH_MOUSE_BTNS;
	f30->gpioled_count = buf[1] & RMI_F30_GPIO_LED_COUNT;

	f30->register_count = DIV_ROUND_UP(f30->gpioled_count, 8);

	if (f30->has_gpio && f30->has_led)
		rmi_f30_set_ctrl_data(&f30->ctrl[0], &control_address,
				      f30->register_count, &ctrl_reg);

	rmi_f30_set_ctrl_data(&f30->ctrl[1], &control_address,
			      sizeof(u8), &ctrl_reg);

	if (f30->has_gpio) {
		rmi_f30_set_ctrl_data(&f30->ctrl[2], &control_address,
				      f30->register_count, &ctrl_reg);

		rmi_f30_set_ctrl_data(&f30->ctrl[3], &control_address,
				      f30->register_count, &ctrl_reg);
	}

	if (f30->has_led) {
		rmi_f30_set_ctrl_data(&f30->ctrl[4], &control_address,
				      f30->register_count, &ctrl_reg);

		rmi_f30_set_ctrl_data(&f30->ctrl[5], &control_address,
				      f30->has_extended_pattern ? 6 : 2,
				      &ctrl_reg);
	}

	if (f30->has_led || f30->has_gpio_driver_control) {
		/* control 6 uses a byte per gpio/led */
		rmi_f30_set_ctrl_data(&f30->ctrl[6], &control_address,
				      f30->gpioled_count, &ctrl_reg);
	}

	if (f30->has_mappable_buttons) {
		/* control 7 uses a byte per gpio/led */
		rmi_f30_set_ctrl_data(&f30->ctrl[7], &control_address,
				      f30->gpioled_count, &ctrl_reg);
	}

	if (f30->has_haptic) {
		rmi_f30_set_ctrl_data(&f30->ctrl[8], &control_address,
				      f30->register_count, &ctrl_reg);

		rmi_f30_set_ctrl_data(&f30->ctrl[9], &control_address,
				      sizeof(u8), &ctrl_reg);
	}

	if (f30->has_mech_mouse_btns)
		rmi_f30_set_ctrl_data(&f30->ctrl[10], &control_address,
				      sizeof(u8), &ctrl_reg);

	f30->ctrl_regs_size = ctrl_reg -
				f30->ctrl_regs ?: RMI_F30_CTRL_REGS_MAX_SIZE;

	error = rmi_f30_read_control_parameters(fn, f30);
	if (error) {
		dev_err(&fn->dev,
			"Failed to initialize F30 control params: %d\n",
			error);
		return error;
	}

	if (f30->has_gpio) {
		error = rmi_f30_map_gpios(fn, f30);
		if (error)
			return error;
	}

	return 0;
}

static int rmi_f30_probe(struct rmi_function *fn)
{
	struct rmi_device *rmi_dev = fn->rmi_dev;
	const struct rmi_device_platform_data *pdata =
					rmi_get_platform_data(rmi_dev);
	struct rmi_driver_data *drv_data = dev_get_drvdata(&rmi_dev->dev);
	struct f30_data *f30;
	int error;

	if (pdata->f30_data.disable)
		return 0;

	if (!drv_data->input) {
		dev_info(&fn->dev, "F30: no input device found, ignoring\n");
		return -ENXIO;
	}

	f30 = devm_kzalloc(&fn->dev, sizeof(*f30), GFP_KERNEL);
	if (!f30)
		return -ENOMEM;

	f30->input = drv_data->input;

	error = rmi_f30_initialize(fn, f30);
	if (error)
		return error;

	dev_set_drvdata(&fn->dev, f30);
	return 0;
}

struct rmi_function_handler rmi_f30_handler = {
	.driver = {
		.name = "rmi4_f30",
	},
	.func = 0x30,
	.probe = rmi_f30_probe,
	.config = rmi_f30_config,
	.attention = rmi_f30_attention,
};