1 /* 2 * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com> 3 * Sponsored by ARMadeus Systems 4 * 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. 9 * 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. 14 * 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 18 * 19 * Driver for Austria Microsystems joysticks AS5011 20 * 21 * TODO: 22 * - Power on the chip when open() and power down when close() 23 * - Manage power mode 24 */ 25 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> 33 34 #define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick" 35 #define MODULE_DEVICE_ALIAS "as5011" 36 37 MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>"); 38 MODULE_DESCRIPTION(DRIVER_DESC); 39 MODULE_LICENSE("GPL"); 40 41 /* registers */ 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 52 53 /* CTRL1 bits */ 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 62 63 /* CTRL2 bits */ 64 #define AS5011_CTRL2_EXT_SAMPLE_EN 0x08 65 #define AS5011_CTRL2_RC_BIAS_ON 0x04 66 #define AS5011_CTRL2_INV_SPINNING 0x02 67 68 #define AS5011_MAX_AXIS 80 69 #define AS5011_MIN_AXIS (-80) 70 #define AS5011_FUZZ 8 71 #define AS5011_FLAT 40 72 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; 79 }; 80 81 static int as5011_i2c_write(struct i2c_client *client, 82 uint8_t aregaddr, 83 uint8_t avalue) 84 { 85 uint8_t data[2] = { aregaddr, avalue }; 86 struct i2c_msg msg = { 87 client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data 88 }; 89 int error; 90 91 error = i2c_transfer(client->adapter, &msg, 1); 92 return error < 0 ? error : 0; 93 } 94 95 static int as5011_i2c_read(struct i2c_client *client, 96 uint8_t aregaddr, signed char *value) 97 { 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 } 102 }; 103 int error; 104 105 error = i2c_transfer(client->adapter, msg_set, 2); 106 if (error < 0) 107 return error; 108 109 *value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0]; 110 return 0; 111 } 112 113 static irqreturn_t as5011_button_interrupt(int irq, void *dev_id) 114 { 115 struct as5011_device *as5011 = dev_id; 116 int val = gpio_get_value_cansleep(as5011->button_gpio); 117 118 input_report_key(as5011->input_dev, BTN_JOYSTICK, !val); 119 input_sync(as5011->input_dev); 120 121 return IRQ_HANDLED; 122 } 123 124 static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id) 125 { 126 struct as5011_device *as5011 = dev_id; 127 int error; 128 signed char x, y; 129 130 error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x); 131 if (error < 0) 132 goto out; 133 134 error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y); 135 if (error < 0) 136 goto out; 137 138 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); 141 142 out: 143 return IRQ_HANDLED; 144 } 145 146 static int __devinit as5011_configure_chip(struct as5011_device *as5011, 147 const struct as5011_platform_data *plat_dat) 148 { 149 struct i2c_client *client = as5011->i2c_client; 150 int error; 151 signed char value; 152 153 /* chip soft reset */ 154 error = as5011_i2c_write(client, AS5011_CTRL1, 155 AS5011_CTRL1_SOFT_RST); 156 if (error < 0) { 157 dev_err(&client->dev, "Soft reset failed\n"); 158 return error; 159 } 160 161 mdelay(10); 162 163 error = as5011_i2c_write(client, AS5011_CTRL1, 164 AS5011_CTRL1_LP_PULSED | 165 AS5011_CTRL1_LP_ACTIVE | 166 AS5011_CTRL1_INT_ACT_EN); 167 if (error < 0) { 168 dev_err(&client->dev, "Power config failed\n"); 169 return error; 170 } 171 172 error = as5011_i2c_write(client, AS5011_CTRL2, 173 AS5011_CTRL2_INV_SPINNING); 174 if (error < 0) { 175 dev_err(&client->dev, "Can't invert spinning\n"); 176 return error; 177 } 178 179 /* write threshold */ 180 error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp); 181 if (error < 0) { 182 dev_err(&client->dev, "Can't write threshold\n"); 183 return error; 184 } 185 186 error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn); 187 if (error < 0) { 188 dev_err(&client->dev, "Can't write threshold\n"); 189 return error; 190 } 191 192 error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp); 193 if (error < 0) { 194 dev_err(&client->dev, "Can't write threshold\n"); 195 return error; 196 } 197 198 error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn); 199 if (error < 0) { 200 dev_err(&client->dev, "Can't write threshold\n"); 201 return error; 202 } 203 204 /* to free irq gpio in chip */ 205 error = as5011_i2c_read(client, AS5011_X_RES_INT, &value); 206 if (error < 0) { 207 dev_err(&client->dev, "Can't read i2c X resolution value\n"); 208 return error; 209 } 210 211 return 0; 212 } 213 214 static int __devinit as5011_probe(struct i2c_client *client, 215 const struct i2c_device_id *id) 216 { 217 const struct as5011_platform_data *plat_data; 218 struct as5011_device *as5011; 219 struct input_dev *input_dev; 220 int irq; 221 int error; 222 223 plat_data = client->dev.platform_data; 224 if (!plat_data) 225 return -EINVAL; 226 227 if (!plat_data->axis_irq) { 228 dev_err(&client->dev, "No axis IRQ?\n"); 229 return -EINVAL; 230 } 231 232 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"); 236 return -ENODEV; 237 } 238 239 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"); 244 error = -ENOMEM; 245 goto err_free_mem; 246 } 247 248 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; 252 253 input_dev->name = "Austria Microsystem as5011 joystick"; 254 input_dev->id.bustype = BUS_I2C; 255 input_dev->dev.parent = &client->dev; 256 257 __set_bit(EV_KEY, input_dev->evbit); 258 __set_bit(EV_ABS, input_dev->evbit); 259 __set_bit(BTN_JOYSTICK, input_dev->keybit); 260 261 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); 265 266 error = gpio_request(as5011->button_gpio, "AS5011 button"); 267 if (error < 0) { 268 dev_err(&client->dev, "Failed to request button gpio\n"); 269 goto err_free_mem; 270 } 271 272 irq = gpio_to_irq(as5011->button_gpio); 273 if (irq < 0) { 274 dev_err(&client->dev, 275 "Failed to get irq number for button gpio\n"); 276 goto err_free_button_gpio; 277 } 278 279 as5011->button_irq = irq; 280 281 error = request_threaded_irq(as5011->button_irq, 282 NULL, as5011_button_interrupt, 283 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 284 "as5011_button", as5011); 285 if (error < 0) { 286 dev_err(&client->dev, 287 "Can't allocate button irq %d\n", as5011->button_irq); 288 goto err_free_button_gpio; 289 } 290 291 error = as5011_configure_chip(as5011, plat_data); 292 if (error) 293 goto err_free_button_irq; 294 295 error = request_threaded_irq(as5011->axis_irq, NULL, 296 as5011_axis_interrupt, 297 plat_data->axis_irqflags, 298 "as5011_joystick", as5011); 299 if (error) { 300 dev_err(&client->dev, 301 "Can't allocate axis irq %d\n", plat_data->axis_irq); 302 goto err_free_button_irq; 303 } 304 305 error = input_register_device(as5011->input_dev); 306 if (error) { 307 dev_err(&client->dev, "Failed to register input device\n"); 308 goto err_free_axis_irq; 309 } 310 311 i2c_set_clientdata(client, as5011); 312 313 return 0; 314 315 err_free_axis_irq: 316 free_irq(as5011->axis_irq, as5011); 317 err_free_button_irq: 318 free_irq(as5011->button_irq, as5011); 319 err_free_button_gpio: 320 gpio_free(as5011->button_gpio); 321 err_free_mem: 322 input_free_device(input_dev); 323 kfree(as5011); 324 325 return error; 326 } 327 328 static int __devexit as5011_remove(struct i2c_client *client) 329 { 330 struct as5011_device *as5011 = i2c_get_clientdata(client); 331 332 free_irq(as5011->axis_irq, as5011); 333 free_irq(as5011->button_irq, as5011); 334 gpio_free(as5011->button_gpio); 335 336 input_unregister_device(as5011->input_dev); 337 kfree(as5011); 338 339 return 0; 340 } 341 342 static const struct i2c_device_id as5011_id[] = { 343 { MODULE_DEVICE_ALIAS, 0 }, 344 { } 345 }; 346 MODULE_DEVICE_TABLE(i2c, as5011_id); 347 348 static struct i2c_driver as5011_driver = { 349 .driver = { 350 .name = "as5011", 351 }, 352 .probe = as5011_probe, 353 .remove = __devexit_p(as5011_remove), 354 .id_table = as5011_id, 355 }; 356 357 static int __init as5011_init(void) 358 { 359 return i2c_add_driver(&as5011_driver); 360 } 361 module_init(as5011_init); 362 363 static void __exit as5011_exit(void) 364 { 365 i2c_del_driver(&as5011_driver); 366 } 367 module_exit(as5011_exit); 368