aboutsummaryrefslogtreecommitdiff
path: root/include/linux/rmi.h
blob: 64125443f8a638e787adfbaebab4755f5d63852a (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
/*
 * Copyright (c) 2011-2016 Synaptics Incorporated
 * Copyright (c) 2011 Unixphere
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#ifndef _RMI_H
#define _RMI_H
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/kfifo.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/types.h>

#define NAME_BUFFER_SIZE 256

/**
 * struct rmi_2d_axis_alignment - target axis alignment
 * @swap_axes: set to TRUE if desired to swap x- and y-axis
 * @flip_x: set to TRUE if desired to flip direction on x-axis
 * @flip_y: set to TRUE if desired to flip direction on y-axis
 * @clip_x_low - reported X coordinates below this setting will be clipped to
 *               the specified value
 * @clip_x_high - reported X coordinates above this setting will be clipped to
 *               the specified value
 * @clip_y_low - reported Y coordinates below this setting will be clipped to
 *               the specified value
 * @clip_y_high - reported Y coordinates above this setting will be clipped to
 *               the specified value
 * @offset_x - this value will be added to all reported X coordinates
 * @offset_y - this value will be added to all reported Y coordinates
 * @rel_report_enabled - if set to true, the relative reporting will be
 *               automatically enabled for this sensor.
 */
struct rmi_2d_axis_alignment {
	bool swap_axes;
	bool flip_x;
	bool flip_y;
	u16 clip_x_low;
	u16 clip_y_low;
	u16 clip_x_high;
	u16 clip_y_high;
	u16 offset_x;
	u16 offset_y;
	u8 delta_x_threshold;
	u8 delta_y_threshold;
};

/** This is used to override any hints an F11 2D sensor might have provided
 * as to what type of sensor it is.
 *
 * @rmi_f11_sensor_default - do not override, determine from F11_2D_QUERY14 if
 * available.
 * @rmi_f11_sensor_touchscreen - treat the sensor as a touchscreen (direct
 * pointing).
 * @rmi_f11_sensor_touchpad - thread the sensor as a touchpad (indirect
 * pointing).
 */
enum rmi_sensor_type {
	rmi_sensor_default = 0,
	rmi_sensor_touchscreen,
	rmi_sensor_touchpad
};

#define RMI_F11_DISABLE_ABS_REPORT      BIT(0)

/**
 * struct rmi_2d_sensor_data - overrides defaults for a 2D sensor.
 * @axis_align - provides axis alignment overrides (see above).
 * @sensor_type - Forces the driver to treat the sensor as an indirect
 * pointing device (touchpad) rather than a direct pointing device
 * (touchscreen).  This is useful when F11_2D_QUERY14 register is not
 * available.
 * @disable_report_mask - Force data to not be reported even if it is supported
 * by the firware.
 * @topbuttonpad - Used with the "5 buttons touchpads" found on the Lenovo 40
 * series
 * @kernel_tracking - most moderns RMI f11 firmwares implement Multifinger
 * Type B protocol. However, there are some corner cases where the user
 * triggers some jumps by tapping with two fingers on the touchpad.
 * Use this setting and dmax to filter out these jumps.
 * Also, when using an old sensor using MF Type A behavior, set to true to
 * report an actual MT protocol B.
 * @dmax - the maximum distance (in sensor units) the kernel tracking allows two
 * distincts fingers to be considered the same.
 */
struct rmi_2d_sensor_platform_data {
	struct rmi_2d_axis_alignment axis_align;
	enum rmi_sensor_type sensor_type;
	int x_mm;
	int y_mm;
	int disable_report_mask;
	u16 rezero_wait;
	bool topbuttonpad;
	bool kernel_tracking;
	int dmax;
	int dribble;
	int palm_detect;
};

/**
 * struct rmi_f30_data - overrides defaults for a single F30 GPIOs/LED chip.
 * @buttonpad - the touchpad is a buttonpad, so enable only the first actual
 * button that is found.
 * @trackstick_buttons - Set when the function 30 is handling the physical
 * buttons of the trackstick (as a PS/2 passthrough device).
 * @disable - the touchpad incorrectly reports F30 and it should be ignored.
 * This is a special case which is due to misconfigured firmware.
 */
struct rmi_f30_data {
	bool buttonpad;
	bool trackstick_buttons;
	bool disable;
};


/*
 * Set the state of a register
 *	DEFAULT - use the default value set by the firmware config
 *	OFF - explicitly disable the register
 *	ON - explicitly enable the register
 */
enum rmi_reg_state {
	RMI_REG_STATE_DEFAULT = 0,
	RMI_REG_STATE_OFF = 1,
	RMI_REG_STATE_ON = 2
};

/**
 * struct rmi_f01_power_management -When non-zero, these values will be written
 * to the touch sensor to override the default firmware settigns.  For a
 * detailed explanation of what each field does, see the corresponding
 * documention in the RMI4 specification.
 *
 * @nosleep - specifies whether the device is permitted to sleep or doze (that
 * is, enter a temporary low power state) when no fingers are touching the
 * sensor.
 * @wakeup_threshold - controls the capacitance threshold at which the touch
 * sensor will decide to wake up from that low power state.
 * @doze_holdoff - controls how long the touch sensor waits after the last
 * finger lifts before entering the doze state, in units of 100ms.
 * @doze_interval - controls the interval between checks for finger presence
 * when the touch sensor is in doze mode, in units of 10ms.
 */
struct rmi_f01_power_management {
	enum rmi_reg_state nosleep;
	u8 wakeup_threshold;
	u8 doze_holdoff;
	u8 doze_interval;
};

/**
 * struct rmi_device_platform_data_spi - provides parameters used in SPI
 * communications.  All Synaptics SPI products support a standard SPI
 * interface; some also support what is called SPI V2 mode, depending on
 * firmware and/or ASIC limitations.  In V2 mode, the touch sensor can
 * support shorter delays during certain operations, and these are specified
 * separately from the standard mode delays.
 *
 * @block_delay - for standard SPI transactions consisting of both a read and
 * write operation, the delay (in microseconds) between the read and write
 * operations.
 * @split_read_block_delay_us - for V2 SPI transactions consisting of both a
 * read and write operation, the delay (in microseconds) between the read and
 * write operations.
 * @read_delay_us - the delay between each byte of a read operation in normal
 * SPI mode.
 * @write_delay_us - the delay between each byte of a write operation in normal
 * SPI mode.
 * @split_read_byte_delay_us - the delay between each byte of a read operation
 * in V2 mode.
 * @pre_delay_us - the delay before the start of a SPI transaction.  This is
 * typically useful in conjunction with custom chip select assertions (see
 * below).
 * @post_delay_us - the delay after the completion of an SPI transaction.  This
 * is typically useful in conjunction with custom chip select assertions (see
 * below).
 * @cs_assert - For systems where the SPI subsystem does not control the CS/SSB
 * line, or where such control is broken, you can provide a custom routine to
 * handle a GPIO as CS/SSB.  This routine will be called at the beginning and
 * end of each SPI transaction.  The RMI SPI implementation will wait
 * pre_delay_us after this routine returns before starting the SPI transfer;
 * and post_delay_us after completion of the SPI transfer(s) before calling it
 * with assert==FALSE.
 */
struct rmi_device_platform_data_spi {
	u32 block_delay_us;
	u32 split_read_block_delay_us;
	u32 read_delay_us;
	u32 write_delay_us;
	u32 split_read_byte_delay_us;
	u32 pre_delay_us;
	u32 post_delay_us;
	u8 bits_per_word;
	u16 mode;

	void *cs_assert_data;
	int (*cs_assert)(const void *cs_assert_data, const bool assert);
};

/**
 * struct rmi_device_platform_data - system specific configuration info.
 *
 * @reset_delay_ms - after issuing a reset command to the touch sensor, the
 * driver waits a few milliseconds to give the firmware a chance to
 * to re-initialize.  You can override the default wait period here.
 * @irq: irq associated with the attn gpio line, or negative
 */
struct rmi_device_platform_data {
	int reset_delay_ms;
	int irq;

	struct rmi_device_platform_data_spi spi_data;

	/* function handler pdata */
	struct rmi_2d_sensor_platform_data sensor_pdata;
	struct rmi_f01_power_management power_management;
	struct rmi_f30_data f30_data;
};

/**
 * struct rmi_function_descriptor - RMI function base addresses
 *
 * @query_base_addr: The RMI Query base address
 * @command_base_addr: The RMI Command base address
 * @control_base_addr: The RMI Control base address
 * @data_base_addr: The RMI Data base address
 * @interrupt_source_count: The number of irqs this RMI function needs
 * @function_number: The RMI function number
 *
 * This struct is used when iterating the Page Description Table. The addresses
 * are 16-bit values to include the current page address.
 *
 */
struct rmi_function_descriptor {
	u16 query_base_addr;
	u16 command_base_addr;
	u16 control_base_addr;
	u16 data_base_addr;
	u8 interrupt_source_count;
	u8 function_number;
	u8 function_version;
};

struct rmi_device;

/**
 * struct rmi_transport_dev - represent an RMI transport device
 *
 * @dev: Pointer to the communication device, e.g. i2c or spi
 * @rmi_dev: Pointer to the RMI device
 * @proto_name: name of the transport protocol (SPI, i2c, etc)
 * @ops: pointer to transport operations implementation
 *
 * The RMI transport device implements the glue between different communication
 * buses such as I2C and SPI.
 *
 */
struct rmi_transport_dev {
	struct device *dev;
	struct rmi_device *rmi_dev;

	const char *proto_name;
	const struct rmi_transport_ops *ops;

	struct rmi_device_platform_data pdata;

	struct input_dev *input;
};

/**
 * struct rmi_transport_ops - defines transport protocol operations.
 *
 * @write_block: Writing a block of data to the specified address
 * @read_block: Read a block of data from the specified address.
 */
struct rmi_transport_ops {
	int (*write_block)(struct rmi_transport_dev *xport, u16 addr,
			   const void *buf, size_t len);
	int (*read_block)(struct rmi_transport_dev *xport, u16 addr,
			  void *buf, size_t len);
	int (*reset)(struct rmi_transport_dev *xport, u16 reset_addr);
};

/**
 * struct rmi_driver - driver for an RMI4 sensor on the RMI bus.
 *
 * @driver: Device driver model driver
 * @reset_handler: Called when a reset is detected.
 * @clear_irq_bits: Clear the specified bits in the current interrupt mask.
 * @set_irq_bist: Set the specified bits in the current interrupt mask.
 * @store_productid: Callback for cache product id from function 01
 * @data: Private data pointer
 *
 */
struct rmi_driver {
	struct device_driver driver;

	int (*reset_handler)(struct rmi_device *rmi_dev);
	int (*clear_irq_bits)(struct rmi_device *rmi_dev, unsigned long *mask);
	int (*set_irq_bits)(struct rmi_device *rmi_dev, unsigned long *mask);
	int (*store_productid)(struct rmi_device *rmi_dev);
	int (*set_input_params)(struct rmi_device *rmi_dev,
			struct input_dev *input);
	void *data;
};

/**
 * struct rmi_device - represents an RMI4 sensor device on the RMI bus.
 *
 * @dev: The device created for the RMI bus
 * @number: Unique number for the device on the bus.
 * @driver: Pointer to associated driver
 * @xport: Pointer to the transport interface
 *
 */
struct rmi_device {
	struct device dev;
	int number;

	struct rmi_driver *driver;
	struct rmi_transport_dev *xport;

};

struct rmi4_attn_data {
	unsigned long irq_status;
	size_t size;
	void *data;
};

struct rmi_driver_data {
	struct list_head function_list;

	struct rmi_device *rmi_dev;

	struct rmi_function *f01_container;
	struct rmi_function *f34_container;
	bool bootloader_mode;

	int num_of_irq_regs;
	int irq_count;
	void *irq_memory;
	unsigned long *irq_status;
	unsigned long *fn_irq_bits;
	unsigned long *current_irq_mask;
	unsigned long *new_irq_mask;
	struct mutex irq_mutex;
	struct input_dev *input;

	u8 pdt_props;

	u8 num_rx_electrodes;
	u8 num_tx_electrodes;

	bool enabled;
	struct mutex enabled_mutex;

	struct rmi4_attn_data attn_data;
	DECLARE_KFIFO(attn_fifo, struct rmi4_attn_data, 16);
};

int rmi_register_transport_device(struct rmi_transport_dev *xport);
void rmi_unregister_transport_device(struct rmi_transport_dev *xport);

void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
		       void *data, size_t size);

int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake);
int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake);
#endif