summaryrefslogtreecommitdiffstats
path: root/drivers/input/joystick/as5011.c
blob: f6732b57ca0794fc7dc307eeb6905c6e712aac5d (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
/*
 * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
 * Sponsored by ARMadeus Systems
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Driver for Austria Microsystems joysticks AS5011
 *
 * TODO:
 *	- Power on the chip when open() and power down when close()
 *	- Manage power mode
 */

#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/input/as5011.h>
#include <linux/slab.h>

#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
#define MODULE_DEVICE_ALIAS "as5011"

MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/* registers */
#define AS5011_CTRL1		0x76
#define AS5011_CTRL2		0x75
#define AS5011_XP		0x43
#define AS5011_XN		0x44
#define AS5011_YP		0x53
#define AS5011_YN		0x54
#define AS5011_X_REG		0x41
#define AS5011_Y_REG		0x42
#define AS5011_X_RES_INT	0x51
#define AS5011_Y_RES_INT	0x52

/* CTRL1 bits */
#define AS5011_CTRL1_LP_PULSED		0x80
#define AS5011_CTRL1_LP_ACTIVE		0x40
#define AS5011_CTRL1_LP_CONTINUE	0x20
#define AS5011_CTRL1_INT_WUP_EN		0x10
#define AS5011_CTRL1_INT_ACT_EN		0x08
#define AS5011_CTRL1_EXT_CLK_EN		0x04
#define AS5011_CTRL1_SOFT_RST		0x02
#define AS5011_CTRL1_DATA_VALID		0x01

/* CTRL2 bits */
#define AS5011_CTRL2_EXT_SAMPLE_EN	0x08
#define AS5011_CTRL2_RC_BIAS_ON		0x04
#define AS5011_CTRL2_INV_SPINNING	0x02

#define AS5011_MAX_AXIS	80
#define AS5011_MIN_AXIS	(-80)
#define AS5011_FUZZ	8
#define AS5011_FLAT	40

struct as5011_device {
	struct input_dev *input_dev;
	struct i2c_client *i2c_client;
	unsigned int button_gpio;
	unsigned int button_irq;
	unsigned int axis_irq;
};

static int as5011_i2c_write(struct i2c_client *client,
			    uint8_t aregaddr,
			    uint8_t avalue)
{
	uint8_t data[2] = { aregaddr, avalue };
	struct i2c_msg msg = {
		client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data
	};
	int error;

	error = i2c_transfer(client->adapter, &msg, 1);
	return error < 0 ? error : 0;
}

static int as5011_i2c_read(struct i2c_client *client,
			   uint8_t aregaddr, signed char *value)
{
	uint8_t data[2] = { aregaddr };
	struct i2c_msg msg_set[2] = {
		{ client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data },
		{ client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (uint8_t *)data }
	};
	int error;

	error = i2c_transfer(client->adapter, msg_set, 2);
	if (error < 0)
		return error;

	*value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
	return 0;
}

static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
{
	struct as5011_device *as5011 = dev_id;
	int val = gpio_get_value_cansleep(as5011->button_gpio);

	input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
	input_sync(as5011->input_dev);

	return IRQ_HANDLED;
}

static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
{
	struct as5011_device *as5011 = dev_id;
	int error;
	signed char x, y;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
	if (error < 0)
		goto out;

	error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
	if (error < 0)
		goto out;

	input_report_abs(as5011->input_dev, ABS_X, x);
	input_report_abs(as5011->input_dev, ABS_Y, y);
	input_sync(as5011->input_dev);

out:
	return IRQ_HANDLED;
}

static int __devinit as5011_configure_chip(struct as5011_device *as5011,
				const struct as5011_platform_data *plat_dat)
{
	struct i2c_client *client = as5011->i2c_client;
	int error;
	signed char value;

	/* chip soft reset */
	error = as5011_i2c_write(client, AS5011_CTRL1,
				 AS5011_CTRL1_SOFT_RST);
	if (error < 0) {
		dev_err(&client->dev, "Soft reset failed\n");
		return error;
	}

	mdelay(10);

	error = as5011_i2c_write(client, AS5011_CTRL1,
				 AS5011_CTRL1_LP_PULSED |
				 AS5011_CTRL1_LP_ACTIVE |
				 AS5011_CTRL1_INT_ACT_EN);
	if (error < 0) {
		dev_err(&client->dev, "Power config failed\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_CTRL2,
				 AS5011_CTRL2_INV_SPINNING);
	if (error < 0) {
		dev_err(&client->dev, "Can't invert spinning\n");
		return error;
	}

	/* write threshold */
	error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
	if (error < 0) {
		dev_err(&client->dev, "Can't write threshold\n");
		return error;
	}

	/* to free irq gpio in chip */
	error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
	if (error < 0) {
		dev_err(&client->dev, "Can't read i2c X resolution value\n");
		return error;
	}

	return 0;
}

static int __devinit as5011_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	const struct as5011_platform_data *plat_data;
	struct as5011_device *as5011;
	struct input_dev *input_dev;
	int irq;
	int error;

	plat_data = client->dev.platform_data;
	if (!plat_data)
		return -EINVAL;

	if (!plat_data->axis_irq) {
		dev_err(&client->dev, "No axis IRQ?\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_PROTOCOL_MANGLING)) {
		dev_err(&client->dev,
			"need i2c bus that supports protocol mangling\n");
		return -ENODEV;
	}

	as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!as5011 || !input_dev) {
		dev_err(&client->dev,
			"Can't allocate memory for device structure\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	as5011->i2c_client = client;
	as5011->input_dev = input_dev;
	as5011->button_gpio = plat_data->button_gpio;
	as5011->axis_irq = plat_data->axis_irq;

	input_dev->name = "Austria Microsystem as5011 joystick";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;

	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(EV_ABS, input_dev->evbit);
	__set_bit(BTN_JOYSTICK, input_dev->keybit);

	input_set_abs_params(input_dev, ABS_X,
		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
	input_set_abs_params(as5011->input_dev, ABS_Y,
		AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);

	error = gpio_request(as5011->button_gpio, "AS5011 button");
	if (error < 0) {
		dev_err(&client->dev, "Failed to request button gpio\n");
		goto err_free_mem;
	}

	irq = gpio_to_irq(as5011->button_gpio);
	if (irq < 0) {
		dev_err(&client->dev,
			"Failed to get irq number for button gpio\n");
		goto err_free_button_gpio;
	}

	as5011->button_irq = irq;

	error = request_threaded_irq(as5011->button_irq,
				     NULL, as5011_button_interrupt,
				     IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
				     "as5011_button", as5011);
	if (error < 0) {
		dev_err(&client->dev,
			"Can't allocate button irq %d\n", as5011->button_irq);
		goto err_free_button_gpio;
	}

	error = as5011_configure_chip(as5011, plat_data);
	if (error)
		goto err_free_button_irq;

	error = request_threaded_irq(as5011->axis_irq, NULL,
				     as5011_axis_interrupt,
				     plat_data->axis_irqflags,
				     "as5011_joystick", as5011);
	if (error) {
		dev_err(&client->dev,
			"Can't allocate axis irq %d\n", plat_data->axis_irq);
		goto err_free_button_irq;
	}

	error = input_register_device(as5011->input_dev);
	if (error) {
		dev_err(&client->dev, "Failed to register input device\n");
		goto err_free_axis_irq;
	}

	i2c_set_clientdata(client, as5011);

	return 0;

err_free_axis_irq:
	free_irq(as5011->axis_irq, as5011);
err_free_button_irq:
	free_irq(as5011->button_irq, as5011);
err_free_button_gpio:
	gpio_free(as5011->button_gpio);
err_free_mem:
	input_free_device(input_dev);
	kfree(as5011);

	return error;
}

static int __devexit as5011_remove(struct i2c_client *client)
{
	struct as5011_device *as5011 = i2c_get_clientdata(client);

	free_irq(as5011->axis_irq, as5011);
	free_irq(as5011->button_irq, as5011);
	gpio_free(as5011->button_gpio);

	input_unregister_device(as5011->input_dev);
	kfree(as5011);

	return 0;
}

static const struct i2c_device_id as5011_id[] = {
	{ MODULE_DEVICE_ALIAS, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, as5011_id);

static struct i2c_driver as5011_driver = {
	.driver = {
		.name = "as5011",
	},
	.probe		= as5011_probe,
	.remove		= __devexit_p(as5011_remove),
	.id_table	= as5011_id,
};

static int __init as5011_init(void)
{
	return i2c_add_driver(&as5011_driver);
}
module_init(as5011_init);

static void __exit as5011_exit(void)
{
	i2c_del_driver(&as5011_driver);
}
module_exit(as5011_exit);