1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VTI CMA3000_D0x Accelerometer driver 4 * 5 * Copyright (C) 2010 Texas Instruments 6 * Author: Hemanth V <hemanthv@ti.com> 7 */ 8 9 #include <linux/types.h> 10 #include <linux/interrupt.h> 11 #include <linux/delay.h> 12 #include <linux/slab.h> 13 #include <linux/input.h> 14 #include <linux/input/cma3000.h> 15 #include <linux/module.h> 16 17 #include "cma3000_d0x.h" 18 19 #define CMA3000_WHOAMI 0x00 20 #define CMA3000_REVID 0x01 21 #define CMA3000_CTRL 0x02 22 #define CMA3000_STATUS 0x03 23 #define CMA3000_RSTR 0x04 24 #define CMA3000_INTSTATUS 0x05 25 #define CMA3000_DOUTX 0x06 26 #define CMA3000_DOUTY 0x07 27 #define CMA3000_DOUTZ 0x08 28 #define CMA3000_MDTHR 0x09 29 #define CMA3000_MDFFTMR 0x0A 30 #define CMA3000_FFTHR 0x0B 31 32 #define CMA3000_RANGE2G (1 << 7) 33 #define CMA3000_RANGE8G (0 << 7) 34 #define CMA3000_BUSI2C (0 << 4) 35 #define CMA3000_MODEMASK (7 << 1) 36 #define CMA3000_GRANGEMASK (1 << 7) 37 38 #define CMA3000_STATUS_PERR 1 39 #define CMA3000_INTSTATUS_FFDET (1 << 2) 40 41 /* Settling time delay in ms */ 42 #define CMA3000_SETDELAY 30 43 44 /* Delay for clearing interrupt in us */ 45 #define CMA3000_INTDELAY 44 46 47 48 /* 49 * Bit weights in mg for bit 0, other bits need 50 * multiply factor 2^n. Eight bit is the sign bit. 51 */ 52 #define BIT_TO_2G 18 53 #define BIT_TO_8G 71 54 55 struct cma3000_accl_data { 56 const struct cma3000_bus_ops *bus_ops; 57 const struct cma3000_platform_data *pdata; 58 59 struct device *dev; 60 struct input_dev *input_dev; 61 62 int bit_to_mg; 63 int irq; 64 65 int g_range; 66 u8 mode; 67 68 struct mutex mutex; 69 bool opened; 70 bool suspended; 71 }; 72 73 #define CMA3000_READ(data, reg, msg) \ 74 (data->bus_ops->read(data->dev, reg, msg)) 75 #define CMA3000_SET(data, reg, val, msg) \ 76 ((data)->bus_ops->write(data->dev, reg, val, msg)) 77 78 /* 79 * Conversion for each of the eight modes to g, depending 80 * on G range i.e 2G or 8G. Some modes always operate in 81 * 8G. 82 */ 83 84 static int mode_to_mg[8][2] = { 85 { 0, 0 }, 86 { BIT_TO_8G, BIT_TO_2G }, 87 { BIT_TO_8G, BIT_TO_2G }, 88 { BIT_TO_8G, BIT_TO_8G }, 89 { BIT_TO_8G, BIT_TO_8G }, 90 { BIT_TO_8G, BIT_TO_2G }, 91 { BIT_TO_8G, BIT_TO_2G }, 92 { 0, 0}, 93 }; 94 95 static void decode_mg(struct cma3000_accl_data *data, int *datax, 96 int *datay, int *dataz) 97 { 98 /* Data in 2's complement, convert to mg */ 99 *datax = ((s8)*datax) * data->bit_to_mg; 100 *datay = ((s8)*datay) * data->bit_to_mg; 101 *dataz = ((s8)*dataz) * data->bit_to_mg; 102 } 103 104 static irqreturn_t cma3000_thread_irq(int irq, void *dev_id) 105 { 106 struct cma3000_accl_data *data = dev_id; 107 int datax, datay, dataz, intr_status; 108 u8 ctrl, mode, range; 109 110 intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status"); 111 if (intr_status < 0) 112 return IRQ_NONE; 113 114 /* Check if free fall is detected, report immediately */ 115 if (intr_status & CMA3000_INTSTATUS_FFDET) { 116 input_report_abs(data->input_dev, ABS_MISC, 1); 117 input_sync(data->input_dev); 118 } else { 119 input_report_abs(data->input_dev, ABS_MISC, 0); 120 } 121 122 datax = CMA3000_READ(data, CMA3000_DOUTX, "X"); 123 datay = CMA3000_READ(data, CMA3000_DOUTY, "Y"); 124 dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z"); 125 126 ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl"); 127 mode = (ctrl & CMA3000_MODEMASK) >> 1; 128 range = (ctrl & CMA3000_GRANGEMASK) >> 7; 129 130 data->bit_to_mg = mode_to_mg[mode][range]; 131 132 /* Interrupt not for this device */ 133 if (data->bit_to_mg == 0) 134 return IRQ_NONE; 135 136 /* Decode register values to milli g */ 137 decode_mg(data, &datax, &datay, &dataz); 138 139 input_report_abs(data->input_dev, ABS_X, datax); 140 input_report_abs(data->input_dev, ABS_Y, datay); 141 input_report_abs(data->input_dev, ABS_Z, dataz); 142 input_sync(data->input_dev); 143 144 return IRQ_HANDLED; 145 } 146 147 static int cma3000_reset(struct cma3000_accl_data *data) 148 { 149 int val; 150 151 /* Reset sequence */ 152 CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset"); 153 CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset"); 154 CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset"); 155 156 /* Settling time delay */ 157 mdelay(10); 158 159 val = CMA3000_READ(data, CMA3000_STATUS, "Status"); 160 if (val < 0) { 161 dev_err(data->dev, "Reset failed\n"); 162 return val; 163 } 164 165 if (val & CMA3000_STATUS_PERR) { 166 dev_err(data->dev, "Parity Error\n"); 167 return -EIO; 168 } 169 170 return 0; 171 } 172 173 static int cma3000_poweron(struct cma3000_accl_data *data) 174 { 175 const struct cma3000_platform_data *pdata = data->pdata; 176 u8 ctrl = 0; 177 int ret; 178 179 if (data->g_range == CMARANGE_2G) { 180 ctrl = (data->mode << 1) | CMA3000_RANGE2G; 181 } else if (data->g_range == CMARANGE_8G) { 182 ctrl = (data->mode << 1) | CMA3000_RANGE8G; 183 } else { 184 dev_info(data->dev, 185 "Invalid G range specified, assuming 8G\n"); 186 ctrl = (data->mode << 1) | CMA3000_RANGE8G; 187 } 188 189 ctrl |= data->bus_ops->ctrl_mod; 190 191 CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr, 192 "Motion Detect Threshold"); 193 CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr, 194 "Time register"); 195 CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr, 196 "Free fall threshold"); 197 ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting"); 198 if (ret < 0) 199 return -EIO; 200 201 msleep(CMA3000_SETDELAY); 202 203 return 0; 204 } 205 206 static int cma3000_poweroff(struct cma3000_accl_data *data) 207 { 208 int ret; 209 210 ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting"); 211 msleep(CMA3000_SETDELAY); 212 213 return ret; 214 } 215 216 static int cma3000_open(struct input_dev *input_dev) 217 { 218 struct cma3000_accl_data *data = input_get_drvdata(input_dev); 219 220 mutex_lock(&data->mutex); 221 222 if (!data->suspended) 223 cma3000_poweron(data); 224 225 data->opened = true; 226 227 mutex_unlock(&data->mutex); 228 229 return 0; 230 } 231 232 static void cma3000_close(struct input_dev *input_dev) 233 { 234 struct cma3000_accl_data *data = input_get_drvdata(input_dev); 235 236 mutex_lock(&data->mutex); 237 238 if (!data->suspended) 239 cma3000_poweroff(data); 240 241 data->opened = false; 242 243 mutex_unlock(&data->mutex); 244 } 245 246 void cma3000_suspend(struct cma3000_accl_data *data) 247 { 248 mutex_lock(&data->mutex); 249 250 if (!data->suspended && data->opened) 251 cma3000_poweroff(data); 252 253 data->suspended = true; 254 255 mutex_unlock(&data->mutex); 256 } 257 EXPORT_SYMBOL(cma3000_suspend); 258 259 260 void cma3000_resume(struct cma3000_accl_data *data) 261 { 262 mutex_lock(&data->mutex); 263 264 if (data->suspended && data->opened) 265 cma3000_poweron(data); 266 267 data->suspended = false; 268 269 mutex_unlock(&data->mutex); 270 } 271 EXPORT_SYMBOL(cma3000_resume); 272 273 struct cma3000_accl_data *cma3000_init(struct device *dev, int irq, 274 const struct cma3000_bus_ops *bops) 275 { 276 const struct cma3000_platform_data *pdata = dev_get_platdata(dev); 277 struct cma3000_accl_data *data; 278 struct input_dev *input_dev; 279 int rev; 280 int error; 281 282 if (!pdata) { 283 dev_err(dev, "platform data not found\n"); 284 error = -EINVAL; 285 goto err_out; 286 } 287 288 289 /* if no IRQ return error */ 290 if (irq == 0) { 291 error = -EINVAL; 292 goto err_out; 293 } 294 295 data = kzalloc(sizeof(*data), GFP_KERNEL); 296 input_dev = input_allocate_device(); 297 if (!data || !input_dev) { 298 error = -ENOMEM; 299 goto err_free_mem; 300 } 301 302 data->dev = dev; 303 data->input_dev = input_dev; 304 data->bus_ops = bops; 305 data->pdata = pdata; 306 data->irq = irq; 307 mutex_init(&data->mutex); 308 309 data->mode = pdata->mode; 310 if (data->mode > CMAMODE_POFF) { 311 data->mode = CMAMODE_MOTDET; 312 dev_warn(dev, 313 "Invalid mode specified, assuming Motion Detect\n"); 314 } 315 316 data->g_range = pdata->g_range; 317 if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) { 318 dev_info(dev, 319 "Invalid G range specified, assuming 8G\n"); 320 data->g_range = CMARANGE_8G; 321 } 322 323 input_dev->name = "cma3000-accelerometer"; 324 input_dev->id.bustype = bops->bustype; 325 input_dev->open = cma3000_open; 326 input_dev->close = cma3000_close; 327 328 input_set_abs_params(input_dev, ABS_X, 329 -data->g_range, data->g_range, pdata->fuzz_x, 0); 330 input_set_abs_params(input_dev, ABS_Y, 331 -data->g_range, data->g_range, pdata->fuzz_y, 0); 332 input_set_abs_params(input_dev, ABS_Z, 333 -data->g_range, data->g_range, pdata->fuzz_z, 0); 334 input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0); 335 336 input_set_drvdata(input_dev, data); 337 338 error = cma3000_reset(data); 339 if (error) 340 goto err_free_mem; 341 342 rev = CMA3000_READ(data, CMA3000_REVID, "Revid"); 343 if (rev < 0) { 344 error = rev; 345 goto err_free_mem; 346 } 347 348 pr_info("CMA3000 Accelerometer: Revision %x\n", rev); 349 350 error = request_threaded_irq(irq, NULL, cma3000_thread_irq, 351 pdata->irqflags | IRQF_ONESHOT, 352 "cma3000_d0x", data); 353 if (error) { 354 dev_err(dev, "request_threaded_irq failed\n"); 355 goto err_free_mem; 356 } 357 358 error = input_register_device(data->input_dev); 359 if (error) { 360 dev_err(dev, "Unable to register input device\n"); 361 goto err_free_irq; 362 } 363 364 return data; 365 366 err_free_irq: 367 free_irq(irq, data); 368 err_free_mem: 369 input_free_device(input_dev); 370 kfree(data); 371 err_out: 372 return ERR_PTR(error); 373 } 374 EXPORT_SYMBOL(cma3000_init); 375 376 void cma3000_exit(struct cma3000_accl_data *data) 377 { 378 free_irq(data->irq, data); 379 input_unregister_device(data->input_dev); 380 kfree(data); 381 } 382 EXPORT_SYMBOL(cma3000_exit); 383 384 MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver"); 385 MODULE_LICENSE("GPL"); 386 MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>"); 387