3 * Sponsored by ARMadeus Systems
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Driver for Austria Microsystems joysticks AS5011
22 * - Power on the chip when open() and power down when close()
26 #include <linux/i2c.h>
27 #include <linux/interrupt.h>
28 #include <linux/input.h>
29 #include <linux/gpio.h>
30 #include <linux/delay.h>
31 #include <linux/input/as5011.h>
32 #include <linux/slab.h>
34 #define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
35 #define MODULE_DEVICE_ALIAS "as5011"
38 MODULE_DESCRIPTION(DRIVER_DESC);
39 MODULE_LICENSE("GPL");
42 #define AS5011_CTRL1 0x76
43 #define AS5011_CTRL2 0x75
44 #define AS5011_XP 0x43
45 #define AS5011_XN 0x44
46 #define AS5011_YP 0x53
47 #define AS5011_YN 0x54
48 #define AS5011_X_REG 0x41
49 #define AS5011_Y_REG 0x42
50 #define AS5011_X_RES_INT 0x51
51 #define AS5011_Y_RES_INT 0x52
54 #define AS5011_CTRL1_LP_PULSED 0x80
55 #define AS5011_CTRL1_LP_ACTIVE 0x40
56 #define AS5011_CTRL1_LP_CONTINUE 0x20
57 #define AS5011_CTRL1_INT_WUP_EN 0x10
58 #define AS5011_CTRL1_INT_ACT_EN 0x08
59 #define AS5011_CTRL1_EXT_CLK_EN 0x04
60 #define AS5011_CTRL1_SOFT_RST 0x02
61 #define AS5011_CTRL1_DATA_VALID 0x01
64 #define AS5011_CTRL2_EXT_SAMPLE_EN 0x08
65 #define AS5011_CTRL2_RC_BIAS_ON 0x04
66 #define AS5011_CTRL2_INV_SPINNING 0x02
68 #define AS5011_MAX_AXIS 80
69 #define AS5011_MIN_AXIS (-80)
71 #define AS5011_FLAT 40
73 struct as5011_device {
74 struct input_dev *input_dev;
75 struct i2c_client *i2c_client;
76 unsigned int button_gpio;
77 unsigned int button_irq;
78 unsigned int axis_irq;
81 static int as5011_i2c_write(struct i2c_client *client,
85 uint8_t data[2] = { aregaddr, avalue };
86 struct i2c_msg msg = {
87 client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data
91 error = i2c_transfer(client->adapter, &msg, 1);
92 return error < 0 ? error : 0;
95 static int as5011_i2c_read(struct i2c_client *client,
96 uint8_t aregaddr, signed char *value)
98 uint8_t data[2] = { aregaddr };
99 struct i2c_msg msg_set[2] = {
100 { client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data },
101 { client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (uint8_t *)data }
105 error = i2c_transfer(client->adapter, msg_set, 2);
109 *value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
113 static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
115 struct as5011_device *as5011 = dev_id;
116 int val = gpio_get_value_cansleep(as5011->button_gpio);
118 input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
119 input_sync(as5011->input_dev);
124 static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
126 struct as5011_device *as5011 = dev_id;
130 error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
134 error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
138 input_report_abs(as5011->input_dev, ABS_X, x);
139 input_report_abs(as5011->input_dev, ABS_Y, y);
140 input_sync(as5011->input_dev);
146 static int __devinit as5011_configure_chip(struct as5011_device *as5011,
147 const struct as5011_platform_data *plat_dat)
149 struct i2c_client *client = as5011->i2c_client;
153 /* chip soft reset */
154 error = as5011_i2c_write(client, AS5011_CTRL1,
155 AS5011_CTRL1_SOFT_RST);
157 dev_err(&client->dev, "Soft reset failed\n");
163 error = as5011_i2c_write(client, AS5011_CTRL1,
164 AS5011_CTRL1_LP_PULSED |
165 AS5011_CTRL1_LP_ACTIVE |
166 AS5011_CTRL1_INT_ACT_EN);
168 dev_err(&client->dev, "Power config failed\n");
172 error = as5011_i2c_write(client, AS5011_CTRL2,
173 AS5011_CTRL2_INV_SPINNING);
175 dev_err(&client->dev, "Can't invert spinning\n");
179 /* write threshold */
180 error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
182 dev_err(&client->dev, "Can't write threshold\n");
186 error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
188 dev_err(&client->dev, "Can't write threshold\n");
192 error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
194 dev_err(&client->dev, "Can't write threshold\n");
198 error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
200 dev_err(&client->dev, "Can't write threshold\n");
204 /* to free irq gpio in chip */
205 error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
207 dev_err(&client->dev, "Can't read i2c X resolution value\n");
214 static int __devinit as5011_probe(struct i2c_client *client,
215 const struct i2c_device_id *id)
217 const struct as5011_platform_data *plat_data;
218 struct as5011_device *as5011;
219 struct input_dev *input_dev;
223 plat_data = client->dev.platform_data;
227 if (!plat_data->axis_irq) {
228 dev_err(&client->dev, "No axis IRQ?\n");
232 if (!i2c_check_functionality(client->adapter,
233 I2C_FUNC_PROTOCOL_MANGLING)) {
234 dev_err(&client->dev,
235 "need i2c bus that supports protocol mangling\n");
239 as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
240 input_dev = input_allocate_device();
241 if (!as5011 || !input_dev) {
242 dev_err(&client->dev,
243 "Can't allocate memory for device structure\n");
248 as5011->i2c_client = client;
249 as5011->input_dev = input_dev;
250 as5011->button_gpio = plat_data->button_gpio;
251 as5011->axis_irq = plat_data->axis_irq;
253 input_dev->name = "Austria Microsystem as5011 joystick";
254 input_dev->id.bustype = BUS_I2C;
255 input_dev->dev.parent = &client->dev;
257 __set_bit(EV_KEY, input_dev->evbit);
258 __set_bit(EV_ABS, input_dev->evbit);
259 __set_bit(BTN_JOYSTICK, input_dev->keybit);
261 input_set_abs_params(input_dev, ABS_X,
262 AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
263 input_set_abs_params(as5011->input_dev, ABS_Y,
264 AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
266 error = gpio_request(as5011->button_gpio, "AS5011 button");
268 dev_err(&client->dev, "Failed to request button gpio\n");
272 irq = gpio_to_irq(as5011->button_gpio);
274 dev_err(&client->dev,
275 "Failed to get irq number for button gpio\n");
276 goto err_free_button_gpio;
279 as5011->button_irq = irq;
281 error = request_threaded_irq(as5011->button_irq,
282 NULL, as5011_button_interrupt,
283 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
284 "as5011_button", as5011);
286 dev_err(&client->dev,
287 "Can't allocate button irq %d\n", as5011->button_irq);
288 goto err_free_button_gpio;
291 error = as5011_configure_chip(as5011, plat_data);
293 goto err_free_button_irq;
295 error = request_threaded_irq(as5011->axis_irq, NULL,
296 as5011_axis_interrupt,
297 plat_data->axis_irqflags,
298 "as5011_joystick", as5011);
300 dev_err(&client->dev,
301 "Can't allocate axis irq %d\n", plat_data->axis_irq);
302 goto err_free_button_irq;
305 error = input_register_device(as5011->input_dev);
307 dev_err(&client->dev, "Failed to register input device\n");
308 goto err_free_axis_irq;
311 i2c_set_clientdata(client, as5011);
316 free_irq(as5011->axis_irq, as5011);
318 free_irq(as5011->button_irq, as5011);
319 err_free_button_gpio:
320 gpio_free(as5011->button_gpio);
322 input_free_device(input_dev);
328 static int __devexit as5011_remove(struct i2c_client *client)
330 struct as5011_device *as5011 = i2c_get_clientdata(client);
332 free_irq(as5011->axis_irq, as5011);
333 free_irq(as5011->button_irq, as5011);
334 gpio_free(as5011->button_gpio);
336 input_unregister_device(as5011->input_dev);
342 static const struct i2c_device_id as5011_id[] = {
343 { MODULE_DEVICE_ALIAS, 0 },
346 MODULE_DEVICE_TABLE(i2c, as5011_id);
348 static struct i2c_driver as5011_driver = {
352 .probe = as5011_probe,
353 .remove = __devexit_p(as5011_remove),
354 .id_table = as5011_id,
357 static int __init as5011_init(void)
359 return i2c_add_driver(&as5011_driver);
361 module_init(as5011_init);
363 static void __exit as5011_exit(void)
365 i2c_del_driver(&as5011_driver);
367 module_exit(as5011_exit);