1 /* 2 * twl6040-vibra.c - TWL6040 Vibrator driver 3 * 4 * Author: Jorge Eduardo Candelaria <jorge.candelaria@ti.com> 5 * Author: Misael Lopez Cruz <misael.lopez@ti.com> 6 * 7 * Copyright: (C) 2011 Texas Instruments, Inc. 8 * 9 * Based on twl4030-vibra.c by Henrik Saari <henrik.saari@nokia.com> 10 * Felipe Balbi <felipe.balbi@nokia.com> 11 * Jari Vanhala <ext-javi.vanhala@nokia.com> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 25 * 02110-1301 USA 26 * 27 */ 28 #include <linux/module.h> 29 #include <linux/platform_device.h> 30 #include <linux/of.h> 31 #include <linux/workqueue.h> 32 #include <linux/input.h> 33 #include <linux/mfd/twl6040.h> 34 #include <linux/slab.h> 35 #include <linux/delay.h> 36 #include <linux/regulator/consumer.h> 37 38 #define EFFECT_DIR_180_DEG 0x8000 39 40 /* Recommended modulation index 85% */ 41 #define TWL6040_VIBRA_MOD 85 42 43 #define TWL6040_NUM_SUPPLIES 2 44 45 struct vibra_info { 46 struct device *dev; 47 struct input_dev *input_dev; 48 struct workqueue_struct *workqueue; 49 struct work_struct play_work; 50 struct mutex mutex; 51 int irq; 52 53 bool enabled; 54 int weak_speed; 55 int strong_speed; 56 int direction; 57 58 unsigned int vibldrv_res; 59 unsigned int vibrdrv_res; 60 unsigned int viblmotor_res; 61 unsigned int vibrmotor_res; 62 63 struct regulator_bulk_data supplies[TWL6040_NUM_SUPPLIES]; 64 65 struct twl6040 *twl6040; 66 }; 67 68 static irqreturn_t twl6040_vib_irq_handler(int irq, void *data) 69 { 70 struct vibra_info *info = data; 71 struct twl6040 *twl6040 = info->twl6040; 72 u8 status; 73 74 status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS); 75 if (status & TWL6040_VIBLOCDET) { 76 dev_warn(info->dev, "Left Vibrator overcurrent detected\n"); 77 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLL, 78 TWL6040_VIBENA); 79 } 80 if (status & TWL6040_VIBROCDET) { 81 dev_warn(info->dev, "Right Vibrator overcurrent detected\n"); 82 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLR, 83 TWL6040_VIBENA); 84 } 85 86 return IRQ_HANDLED; 87 } 88 89 static void twl6040_vibra_enable(struct vibra_info *info) 90 { 91 struct twl6040 *twl6040 = info->twl6040; 92 int ret; 93 94 ret = regulator_bulk_enable(ARRAY_SIZE(info->supplies), info->supplies); 95 if (ret) { 96 dev_err(info->dev, "failed to enable regulators %d\n", ret); 97 return; 98 } 99 100 twl6040_power(info->twl6040, 1); 101 if (twl6040_get_revid(twl6040) <= TWL6040_REV_ES1_1) { 102 /* 103 * ERRATA: Disable overcurrent protection for at least 104 * 3ms when enabling vibrator drivers to avoid false 105 * overcurrent detection 106 */ 107 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 108 TWL6040_VIBENA | TWL6040_VIBCTRL); 109 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 110 TWL6040_VIBENA | TWL6040_VIBCTRL); 111 usleep_range(3000, 3500); 112 } 113 114 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 115 TWL6040_VIBENA); 116 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 117 TWL6040_VIBENA); 118 119 info->enabled = true; 120 } 121 122 static void twl6040_vibra_disable(struct vibra_info *info) 123 { 124 struct twl6040 *twl6040 = info->twl6040; 125 126 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 0x00); 127 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 0x00); 128 twl6040_power(info->twl6040, 0); 129 130 regulator_bulk_disable(ARRAY_SIZE(info->supplies), info->supplies); 131 132 info->enabled = false; 133 } 134 135 static u8 twl6040_vibra_code(int vddvib, int vibdrv_res, int motor_res, 136 int speed, int direction) 137 { 138 int vpk, max_code; 139 u8 vibdat; 140 141 /* output swing */ 142 vpk = (vddvib * motor_res * TWL6040_VIBRA_MOD) / 143 (100 * (vibdrv_res + motor_res)); 144 145 /* 50mV per VIBDAT code step */ 146 max_code = vpk / 50; 147 if (max_code > TWL6040_VIBDAT_MAX) 148 max_code = TWL6040_VIBDAT_MAX; 149 150 /* scale speed to max allowed code */ 151 vibdat = (u8)((speed * max_code) / USHRT_MAX); 152 153 /* 2's complement for direction > 180 degrees */ 154 vibdat *= direction; 155 156 return vibdat; 157 } 158 159 static void twl6040_vibra_set_effect(struct vibra_info *info) 160 { 161 struct twl6040 *twl6040 = info->twl6040; 162 u8 vibdatl, vibdatr; 163 int volt; 164 165 /* weak motor */ 166 volt = regulator_get_voltage(info->supplies[0].consumer) / 1000; 167 vibdatl = twl6040_vibra_code(volt, info->vibldrv_res, 168 info->viblmotor_res, 169 info->weak_speed, info->direction); 170 171 /* strong motor */ 172 volt = regulator_get_voltage(info->supplies[1].consumer) / 1000; 173 vibdatr = twl6040_vibra_code(volt, info->vibrdrv_res, 174 info->vibrmotor_res, 175 info->strong_speed, info->direction); 176 177 twl6040_reg_write(twl6040, TWL6040_REG_VIBDATL, vibdatl); 178 twl6040_reg_write(twl6040, TWL6040_REG_VIBDATR, vibdatr); 179 } 180 181 static void vibra_play_work(struct work_struct *work) 182 { 183 struct vibra_info *info = container_of(work, 184 struct vibra_info, play_work); 185 186 mutex_lock(&info->mutex); 187 188 if (info->weak_speed || info->strong_speed) { 189 if (!info->enabled) 190 twl6040_vibra_enable(info); 191 192 twl6040_vibra_set_effect(info); 193 } else if (info->enabled) 194 twl6040_vibra_disable(info); 195 196 mutex_unlock(&info->mutex); 197 } 198 199 static int vibra_play(struct input_dev *input, void *data, 200 struct ff_effect *effect) 201 { 202 struct vibra_info *info = input_get_drvdata(input); 203 int ret; 204 205 /* Do not allow effect, while the routing is set to use audio */ 206 ret = twl6040_get_vibralr_status(info->twl6040); 207 if (ret & TWL6040_VIBSEL) { 208 dev_info(&input->dev, "Vibra is configured for audio\n"); 209 return -EBUSY; 210 } 211 212 info->weak_speed = effect->u.rumble.weak_magnitude; 213 info->strong_speed = effect->u.rumble.strong_magnitude; 214 info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1; 215 216 ret = queue_work(info->workqueue, &info->play_work); 217 if (!ret) { 218 dev_info(&input->dev, "work is already on queue\n"); 219 return ret; 220 } 221 222 return 0; 223 } 224 225 static void twl6040_vibra_close(struct input_dev *input) 226 { 227 struct vibra_info *info = input_get_drvdata(input); 228 229 cancel_work_sync(&info->play_work); 230 231 mutex_lock(&info->mutex); 232 233 if (info->enabled) 234 twl6040_vibra_disable(info); 235 236 mutex_unlock(&info->mutex); 237 } 238 239 #ifdef CONFIG_PM_SLEEP 240 static int twl6040_vibra_suspend(struct device *dev) 241 { 242 struct platform_device *pdev = to_platform_device(dev); 243 struct vibra_info *info = platform_get_drvdata(pdev); 244 245 mutex_lock(&info->mutex); 246 247 if (info->enabled) 248 twl6040_vibra_disable(info); 249 250 mutex_unlock(&info->mutex); 251 252 return 0; 253 } 254 #endif 255 256 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL); 257 258 static int twl6040_vibra_probe(struct platform_device *pdev) 259 { 260 struct device *twl6040_core_dev = pdev->dev.parent; 261 struct device_node *twl6040_core_node; 262 struct vibra_info *info; 263 int vddvibl_uV = 0; 264 int vddvibr_uV = 0; 265 int error; 266 267 twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node, 268 "vibra"); 269 if (!twl6040_core_node) { 270 dev_err(&pdev->dev, "parent of node is missing?\n"); 271 return -EINVAL; 272 } 273 274 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 275 if (!info) { 276 of_node_put(twl6040_core_node); 277 dev_err(&pdev->dev, "couldn't allocate memory\n"); 278 return -ENOMEM; 279 } 280 281 info->dev = &pdev->dev; 282 283 info->twl6040 = dev_get_drvdata(pdev->dev.parent); 284 285 of_property_read_u32(twl6040_core_node, "ti,vibldrv-res", 286 &info->vibldrv_res); 287 of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res", 288 &info->vibrdrv_res); 289 of_property_read_u32(twl6040_core_node, "ti,viblmotor-res", 290 &info->viblmotor_res); 291 of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res", 292 &info->vibrmotor_res); 293 of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV", &vddvibl_uV); 294 of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV", &vddvibr_uV); 295 296 of_node_put(twl6040_core_node); 297 298 if ((!info->vibldrv_res && !info->viblmotor_res) || 299 (!info->vibrdrv_res && !info->vibrmotor_res)) { 300 dev_err(info->dev, "invalid vibra driver/motor resistance\n"); 301 return -EINVAL; 302 } 303 304 info->irq = platform_get_irq(pdev, 0); 305 if (info->irq < 0) { 306 dev_err(info->dev, "invalid irq\n"); 307 return -EINVAL; 308 } 309 310 mutex_init(&info->mutex); 311 312 error = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, 313 twl6040_vib_irq_handler, 0, 314 "twl6040_irq_vib", info); 315 if (error) { 316 dev_err(info->dev, "VIB IRQ request failed: %d\n", error); 317 return error; 318 } 319 320 info->supplies[0].supply = "vddvibl"; 321 info->supplies[1].supply = "vddvibr"; 322 /* 323 * When booted with Device tree the regulators are attached to the 324 * parent device (twl6040 MFD core) 325 */ 326 error = devm_regulator_bulk_get(twl6040_core_dev, 327 ARRAY_SIZE(info->supplies), 328 info->supplies); 329 if (error) { 330 dev_err(info->dev, "couldn't get regulators %d\n", error); 331 return error; 332 } 333 334 if (vddvibl_uV) { 335 error = regulator_set_voltage(info->supplies[0].consumer, 336 vddvibl_uV, vddvibl_uV); 337 if (error) { 338 dev_err(info->dev, "failed to set VDDVIBL volt %d\n", 339 error); 340 return error; 341 } 342 } 343 344 if (vddvibr_uV) { 345 error = regulator_set_voltage(info->supplies[1].consumer, 346 vddvibr_uV, vddvibr_uV); 347 if (error) { 348 dev_err(info->dev, "failed to set VDDVIBR volt %d\n", 349 error); 350 return error; 351 } 352 } 353 354 INIT_WORK(&info->play_work, vibra_play_work); 355 356 info->input_dev = devm_input_allocate_device(&pdev->dev); 357 if (!info->input_dev) { 358 dev_err(info->dev, "couldn't allocate input device\n"); 359 return -ENOMEM; 360 } 361 362 input_set_drvdata(info->input_dev, info); 363 364 info->input_dev->name = "twl6040:vibrator"; 365 info->input_dev->id.version = 1; 366 info->input_dev->dev.parent = pdev->dev.parent; 367 info->input_dev->close = twl6040_vibra_close; 368 __set_bit(FF_RUMBLE, info->input_dev->ffbit); 369 370 error = input_ff_create_memless(info->input_dev, NULL, vibra_play); 371 if (error) { 372 dev_err(info->dev, "couldn't register vibrator to FF\n"); 373 return error; 374 } 375 376 error = input_register_device(info->input_dev); 377 if (error) { 378 dev_err(info->dev, "couldn't register input device\n"); 379 return error; 380 } 381 382 platform_set_drvdata(pdev, info); 383 384 return 0; 385 } 386 387 static struct platform_driver twl6040_vibra_driver = { 388 .probe = twl6040_vibra_probe, 389 .driver = { 390 .name = "twl6040-vibra", 391 .owner = THIS_MODULE, 392 .pm = &twl6040_vibra_pm_ops, 393 }, 394 }; 395 module_platform_driver(twl6040_vibra_driver); 396 397 MODULE_ALIAS("platform:twl6040-vibra"); 398 MODULE_DESCRIPTION("TWL6040 Vibra driver"); 399 MODULE_LICENSE("GPL"); 400 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>"); 401 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>"); 402