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 #include <linux/module.h> 34 35 #define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick" 36 #define MODULE_DEVICE_ALIAS "as5011" 37 38 MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>"); 39 MODULE_DESCRIPTION(DRIVER_DESC); 40 MODULE_LICENSE("GPL"); 41 42 /* registers */ 43 #define AS5011_CTRL1 0x76 44 #define AS5011_CTRL2 0x75 45 #define AS5011_XP 0x43 46 #define AS5011_XN 0x44 47 #define AS5011_YP 0x53 48 #define AS5011_YN 0x54 49 #define AS5011_X_REG 0x41 50 #define AS5011_Y_REG 0x42 51 #define AS5011_X_RES_INT 0x51 52 #define AS5011_Y_RES_INT 0x52 53 54 /* CTRL1 bits */ 55 #define AS5011_CTRL1_LP_PULSED 0x80 56 #define AS5011_CTRL1_LP_ACTIVE 0x40 57 #define AS5011_CTRL1_LP_CONTINUE 0x20 58 #define AS5011_CTRL1_INT_WUP_EN 0x10 59 #define AS5011_CTRL1_INT_ACT_EN 0x08 60 #define AS5011_CTRL1_EXT_CLK_EN 0x04 61 #define AS5011_CTRL1_SOFT_RST 0x02 62 #define AS5011_CTRL1_DATA_VALID 0x01 63 64 /* CTRL2 bits */ 65 #define AS5011_CTRL2_EXT_SAMPLE_EN 0x08 66 #define AS5011_CTRL2_RC_BIAS_ON 0x04 67 #define AS5011_CTRL2_INV_SPINNING 0x02 68 69 #define AS5011_MAX_AXIS 80 70 #define AS5011_MIN_AXIS (-80) 71 #define AS5011_FUZZ 8 72 #define AS5011_FLAT 40 73 74 struct as5011_device { 75 struct input_dev *input_dev; 76 struct i2c_client *i2c_client; 77 unsigned int button_gpio; 78 unsigned int button_irq; 79 unsigned int axis_irq; 80 }; 81 82 static int as5011_i2c_write(struct i2c_client *client, 83 uint8_t aregaddr, 84 uint8_t avalue) 85 { 86 uint8_t data[2] = { aregaddr, avalue }; 87 struct i2c_msg msg = { 88 client->addr, I2C_M_IGNORE_NAK, 2, (uint8_t *)data 89 }; 90 int error; 91 92 error = i2c_transfer(client->adapter, &msg, 1); 93 return error < 0 ? error : 0; 94 } 95 96 static int as5011_i2c_read(struct i2c_client *client, 97 uint8_t aregaddr, signed char *value) 98 { 99 uint8_t data[2] = { aregaddr }; 100 struct i2c_msg msg_set[2] = { 101 { client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data }, 102 { client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (uint8_t *)data } 103 }; 104 int error; 105 106 error = i2c_transfer(client->adapter, msg_set, 2); 107 if (error < 0) 108 return error; 109 110 *value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0]; 111 return 0; 112 } 113 114 static irqreturn_t as5011_button_interrupt(int irq, void *dev_id) 115 { 116 struct as5011_device *as5011 = dev_id; 117 int val = gpio_get_value_cansleep(as5011->button_gpio); 118 119 input_report_key(as5011->input_dev, BTN_JOYSTICK, !val); 120 input_sync(as5011->input_dev); 121 122 return IRQ_HANDLED; 123 } 124 125 static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id) 126 { 127 struct as5011_device *as5011 = dev_id; 128 int error; 129 signed char x, y; 130 131 error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x); 132 if (error < 0) 133 goto out; 134 135 error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y); 136 if (error < 0) 137 goto out; 138 139 input_report_abs(as5011->input_dev, ABS_X, x); 140 input_report_abs(as5011->input_dev, ABS_Y, y); 141 input_sync(as5011->input_dev); 142 143 out: 144 return IRQ_HANDLED; 145 } 146 147 static int __devinit as5011_configure_chip(struct as5011_device *as5011, 148 const struct as5011_platform_data *plat_dat) 149 { 150 struct i2c_client *client = as5011->i2c_client; 151 int error; 152 signed char value; 153 154 /* chip soft reset */ 155 error = as5011_i2c_write(client, AS5011_CTRL1, 156 AS5011_CTRL1_SOFT_RST); 157 if (error < 0) { 158 dev_err(&client->dev, "Soft reset failed\n"); 159 return error; 160 } 161 162 mdelay(10); 163 164 error = as5011_i2c_write(client, AS5011_CTRL1, 165 AS5011_CTRL1_LP_PULSED | 166 AS5011_CTRL1_LP_ACTIVE | 167 AS5011_CTRL1_INT_ACT_EN); 168 if (error < 0) { 169 dev_err(&client->dev, "Power config failed\n"); 170 return error; 171 } 172 173 error = as5011_i2c_write(client, AS5011_CTRL2, 174 AS5011_CTRL2_INV_SPINNING); 175 if (error < 0) { 176 dev_err(&client->dev, "Can't invert spinning\n"); 177 return error; 178 } 179 180 /* write threshold */ 181 error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp); 182 if (error < 0) { 183 dev_err(&client->dev, "Can't write threshold\n"); 184 return error; 185 } 186 187 error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn); 188 if (error < 0) { 189 dev_err(&client->dev, "Can't write threshold\n"); 190 return error; 191 } 192 193 error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp); 194 if (error < 0) { 195 dev_err(&client->dev, "Can't write threshold\n"); 196 return error; 197 } 198 199 error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn); 200 if (error < 0) { 201 dev_err(&client->dev, "Can't write threshold\n"); 202 return error; 203 } 204 205 /* to free irq gpio in chip */ 206 error = as5011_i2c_read(client, AS5011_X_RES_INT, &value); 207 if (error < 0) { 208 dev_err(&client->dev, "Can't read i2c X resolution value\n"); 209 return error; 210 } 211 212 return 0; 213 } 214 215 static int __devinit as5011_probe(struct i2c_client *client, 216 const struct i2c_device_id *id) 217 { 218 const struct as5011_platform_data *plat_data; 219 struct as5011_device *as5011; 220 struct input_dev *input_dev; 221 int irq; 222 int error; 223 224 plat_data = client->dev.platform_data; 225 if (!plat_data) 226 return -EINVAL; 227 228 if (!plat_data->axis_irq) { 229 dev_err(&client->dev, "No axis IRQ?\n"); 230 return -EINVAL; 231 } 232 233 if (!i2c_check_functionality(client->adapter, 234 I2C_FUNC_PROTOCOL_MANGLING)) { 235 dev_err(&client->dev, 236 "need i2c bus that supports protocol mangling\n"); 237 return -ENODEV; 238 } 239 240 as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL); 241 input_dev = input_allocate_device(); 242 if (!as5011 || !input_dev) { 243 dev_err(&client->dev, 244 "Can't allocate memory for device structure\n"); 245 error = -ENOMEM; 246 goto err_free_mem; 247 } 248 249 as5011->i2c_client = client; 250 as5011->input_dev = input_dev; 251 as5011->button_gpio = plat_data->button_gpio; 252 as5011->axis_irq = plat_data->axis_irq; 253 254 input_dev->name = "Austria Microsystem as5011 joystick"; 255 input_dev->id.bustype = BUS_I2C; 256 input_dev->dev.parent = &client->dev; 257 258 __set_bit(EV_KEY, input_dev->evbit); 259 __set_bit(EV_ABS, input_dev->evbit); 260 __set_bit(BTN_JOYSTICK, input_dev->keybit); 261 262 input_set_abs_params(input_dev, ABS_X, 263 AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT); 264 input_set_abs_params(as5011->input_dev, ABS_Y, 265 AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT); 266 267 error = gpio_request(as5011->button_gpio, "AS5011 button"); 268 if (error < 0) { 269 dev_err(&client->dev, "Failed to request button gpio\n"); 270 goto err_free_mem; 271 } 272 273 irq = gpio_to_irq(as5011->button_gpio); 274 if (irq < 0) { 275 dev_err(&client->dev, 276 "Failed to get irq number for button gpio\n"); 277 goto err_free_button_gpio; 278 } 279 280 as5011->button_irq = irq; 281 282 error = request_threaded_irq(as5011->button_irq, 283 NULL, as5011_button_interrupt, 284 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 285 "as5011_button", as5011); 286 if (error < 0) { 287 dev_err(&client->dev, 288 "Can't allocate button irq %d\n", as5011->button_irq); 289 goto err_free_button_gpio; 290 } 291 292 error = as5011_configure_chip(as5011, plat_data); 293 if (error) 294 goto err_free_button_irq; 295 296 error = request_threaded_irq(as5011->axis_irq, NULL, 297 as5011_axis_interrupt, 298 plat_data->axis_irqflags, 299 "as5011_joystick", as5011); 300 if (error) { 301 dev_err(&client->dev, 302 "Can't allocate axis irq %d\n", plat_data->axis_irq); 303 goto err_free_button_irq; 304 } 305 306 error = input_register_device(as5011->input_dev); 307 if (error) { 308 dev_err(&client->dev, "Failed to register input device\n"); 309 goto err_free_axis_irq; 310 } 311 312 i2c_set_clientdata(client, as5011); 313 314 return 0; 315 316 err_free_axis_irq: 317 free_irq(as5011->axis_irq, as5011); 318 err_free_button_irq: 319 free_irq(as5011->button_irq, as5011); 320 err_free_button_gpio: 321 gpio_free(as5011->button_gpio); 322 err_free_mem: 323 input_free_device(input_dev); 324 kfree(as5011); 325 326 return error; 327 } 328 329 static int __devexit as5011_remove(struct i2c_client *client) 330 { 331 struct as5011_device *as5011 = i2c_get_clientdata(client); 332 333 free_irq(as5011->axis_irq, as5011); 334 free_irq(as5011->button_irq, as5011); 335 gpio_free(as5011->button_gpio); 336 337 input_unregister_device(as5011->input_dev); 338 kfree(as5011); 339 340 return 0; 341 } 342 343 static const struct i2c_device_id as5011_id[] = { 344 { MODULE_DEVICE_ALIAS, 0 }, 345 { } 346 }; 347 MODULE_DEVICE_TABLE(i2c, as5011_id); 348 349 static struct i2c_driver as5011_driver = { 350 .driver = { 351 .name = "as5011", 352 }, 353 .probe = as5011_probe, 354 .remove = __devexit_p(as5011_remove), 355 .id_table = as5011_id, 356 }; 357 358 static int __init as5011_init(void) 359 { 360 return i2c_add_driver(&as5011_driver); 361 } 362 module_init(as5011_init); 363 364 static void __exit as5011_exit(void) 365 { 366 i2c_del_driver(&as5011_driver); 367 } 368 module_exit(as5011_exit); 369