1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the ADC present in the Atmel AT91 evaluation boards. 4 * 5 * Copyright 2011 Free Electrons 6 */ 7 8 #include <linux/bitmap.h> 9 #include <linux/bitops.h> 10 #include <linux/clk.h> 11 #include <linux/err.h> 12 #include <linux/io.h> 13 #include <linux/input.h> 14 #include <linux/interrupt.h> 15 #include <linux/jiffies.h> 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/of_device.h> 20 #include <linux/platform_device.h> 21 #include <linux/sched.h> 22 #include <linux/slab.h> 23 #include <linux/wait.h> 24 25 #include <linux/iio/iio.h> 26 #include <linux/iio/buffer.h> 27 #include <linux/iio/trigger.h> 28 #include <linux/iio/trigger_consumer.h> 29 #include <linux/iio/triggered_buffer.h> 30 #include <linux/pinctrl/consumer.h> 31 32 /* Registers */ 33 #define AT91_ADC_CR 0x00 /* Control Register */ 34 #define AT91_ADC_SWRST (1 << 0) /* Software Reset */ 35 #define AT91_ADC_START (1 << 1) /* Start Conversion */ 36 37 #define AT91_ADC_MR 0x04 /* Mode Register */ 38 #define AT91_ADC_TSAMOD (3 << 0) /* ADC mode */ 39 #define AT91_ADC_TSAMOD_ADC_ONLY_MODE (0 << 0) /* ADC Mode */ 40 #define AT91_ADC_TSAMOD_TS_ONLY_MODE (1 << 0) /* Touch Screen Only Mode */ 41 #define AT91_ADC_TRGEN (1 << 0) /* Trigger Enable */ 42 #define AT91_ADC_TRGSEL (7 << 1) /* Trigger Selection */ 43 #define AT91_ADC_TRGSEL_TC0 (0 << 1) 44 #define AT91_ADC_TRGSEL_TC1 (1 << 1) 45 #define AT91_ADC_TRGSEL_TC2 (2 << 1) 46 #define AT91_ADC_TRGSEL_EXTERNAL (6 << 1) 47 #define AT91_ADC_LOWRES (1 << 4) /* Low Resolution */ 48 #define AT91_ADC_SLEEP (1 << 5) /* Sleep Mode */ 49 #define AT91_ADC_PENDET (1 << 6) /* Pen contact detection enable */ 50 #define AT91_ADC_PRESCAL_9260 (0x3f << 8) /* Prescalar Rate Selection */ 51 #define AT91_ADC_PRESCAL_9G45 (0xff << 8) 52 #define AT91_ADC_PRESCAL_(x) ((x) << 8) 53 #define AT91_ADC_STARTUP_9260 (0x1f << 16) /* Startup Up Time */ 54 #define AT91_ADC_STARTUP_9G45 (0x7f << 16) 55 #define AT91_ADC_STARTUP_9X5 (0xf << 16) 56 #define AT91_ADC_STARTUP_(x) ((x) << 16) 57 #define AT91_ADC_SHTIM (0xf << 24) /* Sample & Hold Time */ 58 #define AT91_ADC_SHTIM_(x) ((x) << 24) 59 #define AT91_ADC_PENDBC (0x0f << 28) /* Pen Debounce time */ 60 #define AT91_ADC_PENDBC_(x) ((x) << 28) 61 62 #define AT91_ADC_TSR 0x0C 63 #define AT91_ADC_TSR_SHTIM (0xf << 24) /* Sample & Hold Time */ 64 #define AT91_ADC_TSR_SHTIM_(x) ((x) << 24) 65 66 #define AT91_ADC_CHER 0x10 /* Channel Enable Register */ 67 #define AT91_ADC_CHDR 0x14 /* Channel Disable Register */ 68 #define AT91_ADC_CHSR 0x18 /* Channel Status Register */ 69 #define AT91_ADC_CH(n) (1 << (n)) /* Channel Number */ 70 71 #define AT91_ADC_SR 0x1C /* Status Register */ 72 #define AT91_ADC_EOC(n) (1 << (n)) /* End of Conversion on Channel N */ 73 #define AT91_ADC_OVRE(n) (1 << ((n) + 8))/* Overrun Error on Channel N */ 74 #define AT91_ADC_DRDY (1 << 16) /* Data Ready */ 75 #define AT91_ADC_GOVRE (1 << 17) /* General Overrun Error */ 76 #define AT91_ADC_ENDRX (1 << 18) /* End of RX Buffer */ 77 #define AT91_ADC_RXFUFF (1 << 19) /* RX Buffer Full */ 78 79 #define AT91_ADC_SR_9X5 0x30 /* Status Register for 9x5 */ 80 #define AT91_ADC_SR_DRDY_9X5 (1 << 24) /* Data Ready */ 81 82 #define AT91_ADC_LCDR 0x20 /* Last Converted Data Register */ 83 #define AT91_ADC_LDATA (0x3ff) 84 85 #define AT91_ADC_IER 0x24 /* Interrupt Enable Register */ 86 #define AT91_ADC_IDR 0x28 /* Interrupt Disable Register */ 87 #define AT91_ADC_IMR 0x2C /* Interrupt Mask Register */ 88 #define AT91RL_ADC_IER_PEN (1 << 20) 89 #define AT91RL_ADC_IER_NOPEN (1 << 21) 90 #define AT91_ADC_IER_PEN (1 << 29) 91 #define AT91_ADC_IER_NOPEN (1 << 30) 92 #define AT91_ADC_IER_XRDY (1 << 20) 93 #define AT91_ADC_IER_YRDY (1 << 21) 94 #define AT91_ADC_IER_PRDY (1 << 22) 95 #define AT91_ADC_ISR_PENS (1 << 31) 96 97 #define AT91_ADC_CHR(n) (0x30 + ((n) * 4)) /* Channel Data Register N */ 98 #define AT91_ADC_DATA (0x3ff) 99 100 #define AT91_ADC_CDR0_9X5 (0x50) /* Channel Data Register 0 for 9X5 */ 101 102 #define AT91_ADC_ACR 0x94 /* Analog Control Register */ 103 #define AT91_ADC_ACR_PENDETSENS (0x3 << 0) /* pull-up resistor */ 104 105 #define AT91_ADC_TSMR 0xB0 106 #define AT91_ADC_TSMR_TSMODE (3 << 0) /* Touch Screen Mode */ 107 #define AT91_ADC_TSMR_TSMODE_NONE (0 << 0) 108 #define AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS (1 << 0) 109 #define AT91_ADC_TSMR_TSMODE_4WIRE_PRESS (2 << 0) 110 #define AT91_ADC_TSMR_TSMODE_5WIRE (3 << 0) 111 #define AT91_ADC_TSMR_TSAV (3 << 4) /* Averages samples */ 112 #define AT91_ADC_TSMR_TSAV_(x) ((x) << 4) 113 #define AT91_ADC_TSMR_SCTIM (0x0f << 16) /* Switch closure time */ 114 #define AT91_ADC_TSMR_SCTIM_(x) ((x) << 16) 115 #define AT91_ADC_TSMR_PENDBC (0x0f << 28) /* Pen Debounce time */ 116 #define AT91_ADC_TSMR_PENDBC_(x) ((x) << 28) 117 #define AT91_ADC_TSMR_NOTSDMA (1 << 22) /* No Touchscreen DMA */ 118 #define AT91_ADC_TSMR_PENDET_DIS (0 << 24) /* Pen contact detection disable */ 119 #define AT91_ADC_TSMR_PENDET_ENA (1 << 24) /* Pen contact detection enable */ 120 121 #define AT91_ADC_TSXPOSR 0xB4 122 #define AT91_ADC_TSYPOSR 0xB8 123 #define AT91_ADC_TSPRESSR 0xBC 124 125 #define AT91_ADC_TRGR_9260 AT91_ADC_MR 126 #define AT91_ADC_TRGR_9G45 0x08 127 #define AT91_ADC_TRGR_9X5 0xC0 128 129 /* Trigger Register bit field */ 130 #define AT91_ADC_TRGR_TRGPER (0xffff << 16) 131 #define AT91_ADC_TRGR_TRGPER_(x) ((x) << 16) 132 #define AT91_ADC_TRGR_TRGMOD (0x7 << 0) 133 #define AT91_ADC_TRGR_NONE (0 << 0) 134 #define AT91_ADC_TRGR_MOD_PERIOD_TRIG (5 << 0) 135 136 #define AT91_ADC_CHAN(st, ch) \ 137 (st->registers->channel_base + (ch * 4)) 138 #define at91_adc_readl(st, reg) \ 139 (readl_relaxed(st->reg_base + reg)) 140 #define at91_adc_writel(st, reg, val) \ 141 (writel_relaxed(val, st->reg_base + reg)) 142 143 #define DRIVER_NAME "at91_adc" 144 #define MAX_POS_BITS 12 145 146 #define TOUCH_SAMPLE_PERIOD_US 2000 /* 2ms */ 147 #define TOUCH_PEN_DETECT_DEBOUNCE_US 200 148 149 #define MAX_RLPOS_BITS 10 150 #define TOUCH_SAMPLE_PERIOD_US_RL 10000 /* 10ms, the SoC can't keep up with 2ms */ 151 #define TOUCH_SHTIM 0xa 152 #define TOUCH_SCTIM_US 10 /* 10us for the Touchscreen Switches Closure Time */ 153 154 enum atmel_adc_ts_type { 155 ATMEL_ADC_TOUCHSCREEN_NONE = 0, 156 ATMEL_ADC_TOUCHSCREEN_4WIRE = 4, 157 ATMEL_ADC_TOUCHSCREEN_5WIRE = 5, 158 }; 159 160 /** 161 * struct at91_adc_trigger - description of triggers 162 * @name: name of the trigger advertised to the user 163 * @value: value to set in the ADC's trigger setup register 164 * to enable the trigger 165 * @is_external: Does the trigger rely on an external pin? 166 */ 167 struct at91_adc_trigger { 168 const char *name; 169 u8 value; 170 bool is_external; 171 }; 172 173 /** 174 * struct at91_adc_reg_desc - Various informations relative to registers 175 * @channel_base: Base offset for the channel data registers 176 * @drdy_mask: Mask of the DRDY field in the relevant registers 177 * (Interruptions registers mostly) 178 * @status_register: Offset of the Interrupt Status Register 179 * @trigger_register: Offset of the Trigger setup register 180 * @mr_prescal_mask: Mask of the PRESCAL field in the adc MR register 181 * @mr_startup_mask: Mask of the STARTUP field in the adc MR register 182 */ 183 struct at91_adc_reg_desc { 184 u8 channel_base; 185 u32 drdy_mask; 186 u8 status_register; 187 u8 trigger_register; 188 u32 mr_prescal_mask; 189 u32 mr_startup_mask; 190 }; 191 192 struct at91_adc_caps { 193 bool has_ts; /* Support touch screen */ 194 bool has_tsmr; /* only at91sam9x5, sama5d3 have TSMR reg */ 195 /* 196 * Numbers of sampling data will be averaged. Can be 0~3. 197 * Hardware can average (2 ^ ts_filter_average) sample data. 198 */ 199 u8 ts_filter_average; 200 /* Pen Detection input pull-up resistor, can be 0~3 */ 201 u8 ts_pen_detect_sensitivity; 202 203 /* startup time calculate function */ 204 u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz); 205 206 u8 num_channels; 207 208 u8 low_res_bits; 209 u8 high_res_bits; 210 u32 trigger_number; 211 const struct at91_adc_trigger *triggers; 212 struct at91_adc_reg_desc registers; 213 }; 214 215 struct at91_adc_state { 216 struct clk *adc_clk; 217 u16 *buffer; 218 unsigned long channels_mask; 219 struct clk *clk; 220 bool done; 221 int irq; 222 u16 last_value; 223 int chnb; 224 struct mutex lock; 225 u8 num_channels; 226 void __iomem *reg_base; 227 const struct at91_adc_reg_desc *registers; 228 u32 startup_time; 229 u8 sample_hold_time; 230 bool sleep_mode; 231 struct iio_trigger **trig; 232 bool use_external; 233 u32 vref_mv; 234 u32 res; /* resolution used for convertions */ 235 wait_queue_head_t wq_data_avail; 236 const struct at91_adc_caps *caps; 237 238 /* 239 * Following ADC channels are shared by touchscreen: 240 * 241 * CH0 -- Touch screen XP/UL 242 * CH1 -- Touch screen XM/UR 243 * CH2 -- Touch screen YP/LL 244 * CH3 -- Touch screen YM/Sense 245 * CH4 -- Touch screen LR(5-wire only) 246 * 247 * The bitfields below represents the reserved channel in the 248 * touchscreen mode. 249 */ 250 #define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 0) 251 #define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 0) 252 enum atmel_adc_ts_type touchscreen_type; 253 struct input_dev *ts_input; 254 255 u16 ts_sample_period_val; 256 u32 ts_pressure_threshold; 257 u16 ts_pendbc; 258 259 bool ts_bufferedmeasure; 260 u32 ts_prev_absx; 261 u32 ts_prev_absy; 262 }; 263 264 static irqreturn_t at91_adc_trigger_handler(int irq, void *p) 265 { 266 struct iio_poll_func *pf = p; 267 struct iio_dev *idev = pf->indio_dev; 268 struct at91_adc_state *st = iio_priv(idev); 269 struct iio_chan_spec const *chan; 270 int i, j = 0; 271 272 for (i = 0; i < idev->masklength; i++) { 273 if (!test_bit(i, idev->active_scan_mask)) 274 continue; 275 chan = idev->channels + i; 276 st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel)); 277 j++; 278 } 279 280 iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp); 281 282 iio_trigger_notify_done(idev->trig); 283 284 /* Needed to ACK the DRDY interruption */ 285 at91_adc_readl(st, AT91_ADC_LCDR); 286 287 enable_irq(st->irq); 288 289 return IRQ_HANDLED; 290 } 291 292 /* Handler for classic adc channel eoc trigger */ 293 static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) 294 { 295 struct at91_adc_state *st = iio_priv(idev); 296 297 if (iio_buffer_enabled(idev)) { 298 disable_irq_nosync(irq); 299 iio_trigger_poll(idev->trig); 300 } else { 301 st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb)); 302 /* Needed to ACK the DRDY interruption */ 303 at91_adc_readl(st, AT91_ADC_LCDR); 304 st->done = true; 305 wake_up_interruptible(&st->wq_data_avail); 306 } 307 } 308 309 static int at91_ts_sample(struct iio_dev *idev) 310 { 311 struct at91_adc_state *st = iio_priv(idev); 312 unsigned int xscale, yscale, reg, z1, z2; 313 unsigned int x, y, pres, xpos, ypos; 314 unsigned int rxp = 1; 315 unsigned int factor = 1000; 316 317 unsigned int xyz_mask_bits = st->res; 318 unsigned int xyz_mask = (1 << xyz_mask_bits) - 1; 319 320 /* calculate position */ 321 /* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */ 322 reg = at91_adc_readl(st, AT91_ADC_TSXPOSR); 323 xpos = reg & xyz_mask; 324 x = (xpos << MAX_POS_BITS) - xpos; 325 xscale = (reg >> 16) & xyz_mask; 326 if (xscale == 0) { 327 dev_err(&idev->dev, "Error: xscale == 0!\n"); 328 return -1; 329 } 330 x /= xscale; 331 332 /* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */ 333 reg = at91_adc_readl(st, AT91_ADC_TSYPOSR); 334 ypos = reg & xyz_mask; 335 y = (ypos << MAX_POS_BITS) - ypos; 336 yscale = (reg >> 16) & xyz_mask; 337 if (yscale == 0) { 338 dev_err(&idev->dev, "Error: yscale == 0!\n"); 339 return -1; 340 } 341 y /= yscale; 342 343 /* calculate the pressure */ 344 reg = at91_adc_readl(st, AT91_ADC_TSPRESSR); 345 z1 = reg & xyz_mask; 346 z2 = (reg >> 16) & xyz_mask; 347 348 if (z1 != 0) 349 pres = rxp * (x * factor / 1024) * (z2 * factor / z1 - factor) 350 / factor; 351 else 352 pres = st->ts_pressure_threshold; /* no pen contacted */ 353 354 dev_dbg(&idev->dev, "xpos = %d, xscale = %d, ypos = %d, yscale = %d, z1 = %d, z2 = %d, press = %d\n", 355 xpos, xscale, ypos, yscale, z1, z2, pres); 356 357 if (pres < st->ts_pressure_threshold) { 358 dev_dbg(&idev->dev, "x = %d, y = %d, pressure = %d\n", 359 x, y, pres / factor); 360 input_report_abs(st->ts_input, ABS_X, x); 361 input_report_abs(st->ts_input, ABS_Y, y); 362 input_report_abs(st->ts_input, ABS_PRESSURE, pres); 363 input_report_key(st->ts_input, BTN_TOUCH, 1); 364 input_sync(st->ts_input); 365 } else { 366 dev_dbg(&idev->dev, "pressure too low: not reporting\n"); 367 } 368 369 return 0; 370 } 371 372 static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) 373 { 374 struct iio_dev *idev = private; 375 struct at91_adc_state *st = iio_priv(idev); 376 u32 status = at91_adc_readl(st, st->registers->status_register); 377 unsigned int reg; 378 379 status &= at91_adc_readl(st, AT91_ADC_IMR); 380 if (status & GENMASK(st->num_channels - 1, 0)) 381 handle_adc_eoc_trigger(irq, idev); 382 383 if (status & AT91RL_ADC_IER_PEN) { 384 /* Disabling pen debounce is required to get a NOPEN irq */ 385 reg = at91_adc_readl(st, AT91_ADC_MR); 386 reg &= ~AT91_ADC_PENDBC; 387 at91_adc_writel(st, AT91_ADC_MR, reg); 388 389 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN); 390 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_NOPEN 391 | AT91_ADC_EOC(3)); 392 /* Set up period trigger for sampling */ 393 at91_adc_writel(st, st->registers->trigger_register, 394 AT91_ADC_TRGR_MOD_PERIOD_TRIG | 395 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val)); 396 } else if (status & AT91RL_ADC_IER_NOPEN) { 397 reg = at91_adc_readl(st, AT91_ADC_MR); 398 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC; 399 at91_adc_writel(st, AT91_ADC_MR, reg); 400 at91_adc_writel(st, st->registers->trigger_register, 401 AT91_ADC_TRGR_NONE); 402 403 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_NOPEN 404 | AT91_ADC_EOC(3)); 405 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN); 406 st->ts_bufferedmeasure = false; 407 input_report_key(st->ts_input, BTN_TOUCH, 0); 408 input_sync(st->ts_input); 409 } else if (status & AT91_ADC_EOC(3) && st->ts_input) { 410 /* Conversion finished and we've a touchscreen */ 411 if (st->ts_bufferedmeasure) { 412 /* 413 * Last measurement is always discarded, since it can 414 * be erroneous. 415 * Always report previous measurement 416 */ 417 input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx); 418 input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy); 419 input_report_key(st->ts_input, BTN_TOUCH, 1); 420 input_sync(st->ts_input); 421 } else 422 st->ts_bufferedmeasure = true; 423 424 /* Now make new measurement */ 425 st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3)) 426 << MAX_RLPOS_BITS; 427 st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2)); 428 429 st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1)) 430 << MAX_RLPOS_BITS; 431 st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0)); 432 } 433 434 return IRQ_HANDLED; 435 } 436 437 static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) 438 { 439 struct iio_dev *idev = private; 440 struct at91_adc_state *st = iio_priv(idev); 441 u32 status = at91_adc_readl(st, st->registers->status_register); 442 const uint32_t ts_data_irq_mask = 443 AT91_ADC_IER_XRDY | 444 AT91_ADC_IER_YRDY | 445 AT91_ADC_IER_PRDY; 446 447 if (status & GENMASK(st->num_channels - 1, 0)) 448 handle_adc_eoc_trigger(irq, idev); 449 450 if (status & AT91_ADC_IER_PEN) { 451 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN); 452 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_NOPEN | 453 ts_data_irq_mask); 454 /* Set up period trigger for sampling */ 455 at91_adc_writel(st, st->registers->trigger_register, 456 AT91_ADC_TRGR_MOD_PERIOD_TRIG | 457 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val)); 458 } else if (status & AT91_ADC_IER_NOPEN) { 459 at91_adc_writel(st, st->registers->trigger_register, 0); 460 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_NOPEN | 461 ts_data_irq_mask); 462 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN); 463 464 input_report_key(st->ts_input, BTN_TOUCH, 0); 465 input_sync(st->ts_input); 466 } else if ((status & ts_data_irq_mask) == ts_data_irq_mask) { 467 /* Now all touchscreen data is ready */ 468 469 if (status & AT91_ADC_ISR_PENS) { 470 /* validate data by pen contact */ 471 at91_ts_sample(idev); 472 } else { 473 /* triggered by event that is no pen contact, just read 474 * them to clean the interrupt and discard all. 475 */ 476 at91_adc_readl(st, AT91_ADC_TSXPOSR); 477 at91_adc_readl(st, AT91_ADC_TSYPOSR); 478 at91_adc_readl(st, AT91_ADC_TSPRESSR); 479 } 480 } 481 482 return IRQ_HANDLED; 483 } 484 485 static int at91_adc_channel_init(struct iio_dev *idev) 486 { 487 struct at91_adc_state *st = iio_priv(idev); 488 struct iio_chan_spec *chan_array, *timestamp; 489 int bit, idx = 0; 490 unsigned long rsvd_mask = 0; 491 492 /* If touchscreen is enable, then reserve the adc channels */ 493 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE) 494 rsvd_mask = CHAN_MASK_TOUCHSCREEN_4WIRE; 495 else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE) 496 rsvd_mask = CHAN_MASK_TOUCHSCREEN_5WIRE; 497 498 /* set up the channel mask to reserve touchscreen channels */ 499 st->channels_mask &= ~rsvd_mask; 500 501 idev->num_channels = bitmap_weight(&st->channels_mask, 502 st->num_channels) + 1; 503 504 chan_array = devm_kzalloc(&idev->dev, 505 ((idev->num_channels + 1) * 506 sizeof(struct iio_chan_spec)), 507 GFP_KERNEL); 508 509 if (!chan_array) 510 return -ENOMEM; 511 512 for_each_set_bit(bit, &st->channels_mask, st->num_channels) { 513 struct iio_chan_spec *chan = chan_array + idx; 514 515 chan->type = IIO_VOLTAGE; 516 chan->indexed = 1; 517 chan->channel = bit; 518 chan->scan_index = idx; 519 chan->scan_type.sign = 'u'; 520 chan->scan_type.realbits = st->res; 521 chan->scan_type.storagebits = 16; 522 chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); 523 chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); 524 idx++; 525 } 526 timestamp = chan_array + idx; 527 528 timestamp->type = IIO_TIMESTAMP; 529 timestamp->channel = -1; 530 timestamp->scan_index = idx; 531 timestamp->scan_type.sign = 's'; 532 timestamp->scan_type.realbits = 64; 533 timestamp->scan_type.storagebits = 64; 534 535 idev->channels = chan_array; 536 return idev->num_channels; 537 } 538 539 static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev, 540 const struct at91_adc_trigger *triggers, 541 const char *trigger_name) 542 { 543 struct at91_adc_state *st = iio_priv(idev); 544 int i; 545 546 for (i = 0; i < st->caps->trigger_number; i++) { 547 char *name = kasprintf(GFP_KERNEL, 548 "%s-dev%d-%s", 549 idev->name, 550 iio_device_id(idev), 551 triggers[i].name); 552 if (!name) 553 return -ENOMEM; 554 555 if (strcmp(trigger_name, name) == 0) { 556 kfree(name); 557 if (triggers[i].value == 0) 558 return -EINVAL; 559 return triggers[i].value; 560 } 561 562 kfree(name); 563 } 564 565 return -EINVAL; 566 } 567 568 static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) 569 { 570 struct iio_dev *idev = iio_trigger_get_drvdata(trig); 571 struct at91_adc_state *st = iio_priv(idev); 572 const struct at91_adc_reg_desc *reg = st->registers; 573 u32 status = at91_adc_readl(st, reg->trigger_register); 574 int value; 575 u8 bit; 576 577 value = at91_adc_get_trigger_value_by_name(idev, 578 st->caps->triggers, 579 idev->trig->name); 580 if (value < 0) 581 return value; 582 583 if (state) { 584 st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL); 585 if (st->buffer == NULL) 586 return -ENOMEM; 587 588 at91_adc_writel(st, reg->trigger_register, 589 status | value); 590 591 for_each_set_bit(bit, idev->active_scan_mask, 592 st->num_channels) { 593 struct iio_chan_spec const *chan = idev->channels + bit; 594 at91_adc_writel(st, AT91_ADC_CHER, 595 AT91_ADC_CH(chan->channel)); 596 } 597 598 at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask); 599 600 } else { 601 at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask); 602 603 at91_adc_writel(st, reg->trigger_register, 604 status & ~value); 605 606 for_each_set_bit(bit, idev->active_scan_mask, 607 st->num_channels) { 608 struct iio_chan_spec const *chan = idev->channels + bit; 609 at91_adc_writel(st, AT91_ADC_CHDR, 610 AT91_ADC_CH(chan->channel)); 611 } 612 kfree(st->buffer); 613 } 614 615 return 0; 616 } 617 618 static const struct iio_trigger_ops at91_adc_trigger_ops = { 619 .set_trigger_state = &at91_adc_configure_trigger, 620 }; 621 622 static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev, 623 const struct at91_adc_trigger *trigger) 624 { 625 struct iio_trigger *trig; 626 int ret; 627 628 trig = iio_trigger_alloc(idev->dev.parent, "%s-dev%d-%s", idev->name, 629 iio_device_id(idev), trigger->name); 630 if (trig == NULL) 631 return NULL; 632 633 iio_trigger_set_drvdata(trig, idev); 634 trig->ops = &at91_adc_trigger_ops; 635 636 ret = iio_trigger_register(trig); 637 if (ret) { 638 iio_trigger_free(trig); 639 return NULL; 640 } 641 642 return trig; 643 } 644 645 static int at91_adc_trigger_init(struct iio_dev *idev) 646 { 647 struct at91_adc_state *st = iio_priv(idev); 648 int i, ret; 649 650 st->trig = devm_kcalloc(&idev->dev, 651 st->caps->trigger_number, sizeof(*st->trig), 652 GFP_KERNEL); 653 654 if (st->trig == NULL) { 655 ret = -ENOMEM; 656 goto error_ret; 657 } 658 659 for (i = 0; i < st->caps->trigger_number; i++) { 660 if (st->caps->triggers[i].is_external && !(st->use_external)) 661 continue; 662 663 st->trig[i] = at91_adc_allocate_trigger(idev, 664 st->caps->triggers + i); 665 if (st->trig[i] == NULL) { 666 dev_err(&idev->dev, 667 "Could not allocate trigger %d\n", i); 668 ret = -ENOMEM; 669 goto error_trigger; 670 } 671 } 672 673 return 0; 674 675 error_trigger: 676 for (i--; i >= 0; i--) { 677 iio_trigger_unregister(st->trig[i]); 678 iio_trigger_free(st->trig[i]); 679 } 680 error_ret: 681 return ret; 682 } 683 684 static void at91_adc_trigger_remove(struct iio_dev *idev) 685 { 686 struct at91_adc_state *st = iio_priv(idev); 687 int i; 688 689 for (i = 0; i < st->caps->trigger_number; i++) { 690 iio_trigger_unregister(st->trig[i]); 691 iio_trigger_free(st->trig[i]); 692 } 693 } 694 695 static int at91_adc_buffer_init(struct iio_dev *idev) 696 { 697 return iio_triggered_buffer_setup(idev, &iio_pollfunc_store_time, 698 &at91_adc_trigger_handler, NULL); 699 } 700 701 static void at91_adc_buffer_remove(struct iio_dev *idev) 702 { 703 iio_triggered_buffer_cleanup(idev); 704 } 705 706 static int at91_adc_read_raw(struct iio_dev *idev, 707 struct iio_chan_spec const *chan, 708 int *val, int *val2, long mask) 709 { 710 struct at91_adc_state *st = iio_priv(idev); 711 int ret; 712 713 switch (mask) { 714 case IIO_CHAN_INFO_RAW: 715 mutex_lock(&st->lock); 716 717 st->chnb = chan->channel; 718 at91_adc_writel(st, AT91_ADC_CHER, 719 AT91_ADC_CH(chan->channel)); 720 at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel)); 721 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); 722 723 ret = wait_event_interruptible_timeout(st->wq_data_avail, 724 st->done, 725 msecs_to_jiffies(1000)); 726 727 /* Disable interrupts, regardless if adc conversion was 728 * successful or not 729 */ 730 at91_adc_writel(st, AT91_ADC_CHDR, 731 AT91_ADC_CH(chan->channel)); 732 at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel)); 733 734 if (ret > 0) { 735 /* a valid conversion took place */ 736 *val = st->last_value; 737 st->last_value = 0; 738 st->done = false; 739 ret = IIO_VAL_INT; 740 } else if (ret == 0) { 741 /* conversion timeout */ 742 dev_err(&idev->dev, "ADC Channel %d timeout.\n", 743 chan->channel); 744 ret = -ETIMEDOUT; 745 } 746 747 mutex_unlock(&st->lock); 748 return ret; 749 750 case IIO_CHAN_INFO_SCALE: 751 *val = st->vref_mv; 752 *val2 = chan->scan_type.realbits; 753 return IIO_VAL_FRACTIONAL_LOG2; 754 default: 755 break; 756 } 757 return -EINVAL; 758 } 759 760 761 static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz) 762 { 763 /* 764 * Number of ticks needed to cover the startup time of the ADC 765 * as defined in the electrical characteristics of the board, 766 * divided by 8. The formula thus is : 767 * Startup Time = (ticks + 1) * 8 / ADC Clock 768 */ 769 return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8; 770 } 771 772 static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz) 773 { 774 /* 775 * For sama5d3x and at91sam9x5, the formula changes to: 776 * Startup Time = <lookup_table_value> / ADC Clock 777 */ 778 static const int startup_lookup[] = { 779 0, 8, 16, 24, 780 64, 80, 96, 112, 781 512, 576, 640, 704, 782 768, 832, 896, 960 783 }; 784 int i, size = ARRAY_SIZE(startup_lookup); 785 unsigned int ticks; 786 787 ticks = startup_time * adc_clk_khz / 1000; 788 for (i = 0; i < size; i++) 789 if (ticks < startup_lookup[i]) 790 break; 791 792 ticks = i; 793 if (ticks == size) 794 /* Reach the end of lookup table */ 795 ticks = size - 1; 796 797 return ticks; 798 } 799 800 static int at91_adc_probe_dt_ts(struct device_node *node, 801 struct at91_adc_state *st, struct device *dev) 802 { 803 int ret; 804 u32 prop; 805 806 ret = of_property_read_u32(node, "atmel,adc-ts-wires", &prop); 807 if (ret) { 808 dev_info(dev, "ADC Touch screen is disabled.\n"); 809 return 0; 810 } 811 812 switch (prop) { 813 case 4: 814 case 5: 815 st->touchscreen_type = prop; 816 break; 817 default: 818 dev_err(dev, "Unsupported number of touchscreen wires (%d). Should be 4 or 5.\n", prop); 819 return -EINVAL; 820 } 821 822 if (!st->caps->has_tsmr) 823 return 0; 824 prop = 0; 825 of_property_read_u32(node, "atmel,adc-ts-pressure-threshold", &prop); 826 st->ts_pressure_threshold = prop; 827 if (st->ts_pressure_threshold) { 828 return 0; 829 } else { 830 dev_err(dev, "Invalid pressure threshold for the touchscreen\n"); 831 return -EINVAL; 832 } 833 } 834 835 static const struct iio_info at91_adc_info = { 836 .read_raw = &at91_adc_read_raw, 837 }; 838 839 /* Touchscreen related functions */ 840 static int atmel_ts_open(struct input_dev *dev) 841 { 842 struct at91_adc_state *st = input_get_drvdata(dev); 843 844 if (st->caps->has_tsmr) 845 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN); 846 else 847 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN); 848 return 0; 849 } 850 851 static void atmel_ts_close(struct input_dev *dev) 852 { 853 struct at91_adc_state *st = input_get_drvdata(dev); 854 855 if (st->caps->has_tsmr) 856 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN); 857 else 858 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN); 859 } 860 861 static int at91_ts_hw_init(struct iio_dev *idev, u32 adc_clk_khz) 862 { 863 struct at91_adc_state *st = iio_priv(idev); 864 u32 reg = 0; 865 u32 tssctim = 0; 866 int i = 0; 867 868 /* a Pen Detect Debounce Time is necessary for the ADC Touch to avoid 869 * pen detect noise. 870 * The formula is : Pen Detect Debounce Time = (2 ^ pendbc) / ADCClock 871 */ 872 st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz / 873 1000, 1); 874 875 while (st->ts_pendbc >> ++i) 876 ; /* Empty! Find the shift offset */ 877 if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1)))) 878 st->ts_pendbc = i; 879 else 880 st->ts_pendbc = i - 1; 881 882 if (!st->caps->has_tsmr) { 883 reg = at91_adc_readl(st, AT91_ADC_MR); 884 reg |= AT91_ADC_TSAMOD_TS_ONLY_MODE | AT91_ADC_PENDET; 885 886 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC; 887 at91_adc_writel(st, AT91_ADC_MR, reg); 888 889 reg = AT91_ADC_TSR_SHTIM_(TOUCH_SHTIM) & AT91_ADC_TSR_SHTIM; 890 at91_adc_writel(st, AT91_ADC_TSR, reg); 891 892 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL * 893 adc_clk_khz / 1000) - 1, 1); 894 895 return 0; 896 } 897 898 /* Touchscreen Switches Closure time needed for allowing the value to 899 * stabilize. 900 * Switch Closure Time = (TSSCTIM * 4) ADCClock periods 901 */ 902 tssctim = DIV_ROUND_UP(TOUCH_SCTIM_US * adc_clk_khz / 1000, 4); 903 dev_dbg(&idev->dev, "adc_clk at: %d KHz, tssctim at: %d\n", 904 adc_clk_khz, tssctim); 905 906 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE) 907 reg = AT91_ADC_TSMR_TSMODE_4WIRE_PRESS; 908 else 909 reg = AT91_ADC_TSMR_TSMODE_5WIRE; 910 911 reg |= AT91_ADC_TSMR_SCTIM_(tssctim) & AT91_ADC_TSMR_SCTIM; 912 reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average) 913 & AT91_ADC_TSMR_TSAV; 914 reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC; 915 reg |= AT91_ADC_TSMR_NOTSDMA; 916 reg |= AT91_ADC_TSMR_PENDET_ENA; 917 reg |= 0x03 << 8; /* TSFREQ, needs to be bigger than TSAV */ 918 919 at91_adc_writel(st, AT91_ADC_TSMR, reg); 920 921 /* Change adc internal resistor value for better pen detection, 922 * default value is 100 kOhm. 923 * 0 = 200 kOhm, 1 = 150 kOhm, 2 = 100 kOhm, 3 = 50 kOhm 924 * option only available on ES2 and higher 925 */ 926 at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity 927 & AT91_ADC_ACR_PENDETSENS); 928 929 /* Sample Period Time = (TRGPER + 1) / ADCClock */ 930 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US * 931 adc_clk_khz / 1000) - 1, 1); 932 933 return 0; 934 } 935 936 static int at91_ts_register(struct iio_dev *idev, 937 struct platform_device *pdev) 938 { 939 struct at91_adc_state *st = iio_priv(idev); 940 struct input_dev *input; 941 int ret; 942 943 input = input_allocate_device(); 944 if (!input) { 945 dev_err(&idev->dev, "Failed to allocate TS device!\n"); 946 return -ENOMEM; 947 } 948 949 input->name = DRIVER_NAME; 950 input->id.bustype = BUS_HOST; 951 input->dev.parent = &pdev->dev; 952 input->open = atmel_ts_open; 953 input->close = atmel_ts_close; 954 955 __set_bit(EV_ABS, input->evbit); 956 __set_bit(EV_KEY, input->evbit); 957 __set_bit(BTN_TOUCH, input->keybit); 958 if (st->caps->has_tsmr) { 959 input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1, 960 0, 0); 961 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1, 962 0, 0); 963 input_set_abs_params(input, ABS_PRESSURE, 0, 0xffffff, 0, 0); 964 } else { 965 if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) { 966 dev_err(&pdev->dev, 967 "This touchscreen controller only support 4 wires\n"); 968 ret = -EINVAL; 969 goto err; 970 } 971 972 input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1, 973 0, 0); 974 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1, 975 0, 0); 976 } 977 978 st->ts_input = input; 979 input_set_drvdata(input, st); 980 981 ret = input_register_device(input); 982 if (ret) 983 goto err; 984 985 return ret; 986 987 err: 988 input_free_device(st->ts_input); 989 return ret; 990 } 991 992 static void at91_ts_unregister(struct at91_adc_state *st) 993 { 994 input_unregister_device(st->ts_input); 995 } 996 997 static int at91_adc_probe(struct platform_device *pdev) 998 { 999 unsigned int prsc, mstrclk, ticks, adc_clk, adc_clk_khz, shtim; 1000 struct device_node *node = pdev->dev.of_node; 1001 int ret; 1002 struct iio_dev *idev; 1003 struct at91_adc_state *st; 1004 u32 reg, prop; 1005 char *s; 1006 1007 idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state)); 1008 if (!idev) 1009 return -ENOMEM; 1010 1011 st = iio_priv(idev); 1012 1013 st->caps = of_device_get_match_data(&pdev->dev); 1014 1015 st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers"); 1016 1017 if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) { 1018 dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n"); 1019 return -EINVAL; 1020 } 1021 st->channels_mask = prop; 1022 1023 st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode"); 1024 1025 if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) { 1026 dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n"); 1027 return -EINVAL; 1028 } 1029 st->startup_time = prop; 1030 1031 prop = 0; 1032 of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop); 1033 st->sample_hold_time = prop; 1034 1035 if (of_property_read_u32(node, "atmel,adc-vref", &prop)) { 1036 dev_err(&idev->dev, "Missing adc-vref property in the DT.\n"); 1037 return -EINVAL; 1038 } 1039 st->vref_mv = prop; 1040 1041 st->res = st->caps->high_res_bits; 1042 if (st->caps->low_res_bits && 1043 !of_property_read_string(node, "atmel,adc-use-res", (const char **)&s) 1044 && !strcmp(s, "lowres")) 1045 st->res = st->caps->low_res_bits; 1046 1047 dev_info(&idev->dev, "Resolution used: %u bits\n", st->res); 1048 1049 st->registers = &st->caps->registers; 1050 st->num_channels = st->caps->num_channels; 1051 1052 /* Check if touchscreen is supported. */ 1053 if (st->caps->has_ts) { 1054 ret = at91_adc_probe_dt_ts(node, st, &idev->dev); 1055 if (ret) 1056 return ret; 1057 } 1058 1059 platform_set_drvdata(pdev, idev); 1060 1061 idev->name = dev_name(&pdev->dev); 1062 idev->modes = INDIO_DIRECT_MODE; 1063 idev->info = &at91_adc_info; 1064 1065 st->irq = platform_get_irq(pdev, 0); 1066 if (st->irq < 0) 1067 return -ENODEV; 1068 1069 st->reg_base = devm_platform_ioremap_resource(pdev, 0); 1070 if (IS_ERR(st->reg_base)) 1071 return PTR_ERR(st->reg_base); 1072 1073 1074 /* 1075 * Disable all IRQs before setting up the handler 1076 */ 1077 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST); 1078 at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF); 1079 1080 if (st->caps->has_tsmr) 1081 ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0, 1082 pdev->dev.driver->name, idev); 1083 else 1084 ret = request_irq(st->irq, at91_adc_rl_interrupt, 0, 1085 pdev->dev.driver->name, idev); 1086 if (ret) { 1087 dev_err(&pdev->dev, "Failed to allocate IRQ.\n"); 1088 return ret; 1089 } 1090 1091 st->clk = devm_clk_get(&pdev->dev, "adc_clk"); 1092 if (IS_ERR(st->clk)) { 1093 dev_err(&pdev->dev, "Failed to get the clock.\n"); 1094 ret = PTR_ERR(st->clk); 1095 goto error_free_irq; 1096 } 1097 1098 ret = clk_prepare_enable(st->clk); 1099 if (ret) { 1100 dev_err(&pdev->dev, 1101 "Could not prepare or enable the clock.\n"); 1102 goto error_free_irq; 1103 } 1104 1105 st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk"); 1106 if (IS_ERR(st->adc_clk)) { 1107 dev_err(&pdev->dev, "Failed to get the ADC clock.\n"); 1108 ret = PTR_ERR(st->adc_clk); 1109 goto error_disable_clk; 1110 } 1111 1112 ret = clk_prepare_enable(st->adc_clk); 1113 if (ret) { 1114 dev_err(&pdev->dev, 1115 "Could not prepare or enable the ADC clock.\n"); 1116 goto error_disable_clk; 1117 } 1118 1119 /* 1120 * Prescaler rate computation using the formula from the Atmel's 1121 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being 1122 * specified by the electrical characteristics of the board. 1123 */ 1124 mstrclk = clk_get_rate(st->clk); 1125 adc_clk = clk_get_rate(st->adc_clk); 1126 adc_clk_khz = adc_clk / 1000; 1127 1128 dev_dbg(&pdev->dev, "Master clock is set as: %d Hz, adc_clk should set as: %d Hz\n", 1129 mstrclk, adc_clk); 1130 1131 prsc = (mstrclk / (2 * adc_clk)) - 1; 1132 1133 if (!st->startup_time) { 1134 dev_err(&pdev->dev, "No startup time available.\n"); 1135 ret = -EINVAL; 1136 goto error_disable_adc_clk; 1137 } 1138 ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz); 1139 1140 /* 1141 * a minimal Sample and Hold Time is necessary for the ADC to guarantee 1142 * the best converted final value between two channels selection 1143 * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock 1144 */ 1145 if (st->sample_hold_time > 0) 1146 shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000) 1147 - 1, 1); 1148 else 1149 shtim = 0; 1150 1151 reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask; 1152 reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask; 1153 if (st->res == st->caps->low_res_bits) 1154 reg |= AT91_ADC_LOWRES; 1155 if (st->sleep_mode) 1156 reg |= AT91_ADC_SLEEP; 1157 reg |= AT91_ADC_SHTIM_(shtim) & AT91_ADC_SHTIM; 1158 at91_adc_writel(st, AT91_ADC_MR, reg); 1159 1160 /* Setup the ADC channels available on the board */ 1161 ret = at91_adc_channel_init(idev); 1162 if (ret < 0) { 1163 dev_err(&pdev->dev, "Couldn't initialize the channels.\n"); 1164 goto error_disable_adc_clk; 1165 } 1166 1167 init_waitqueue_head(&st->wq_data_avail); 1168 mutex_init(&st->lock); 1169 1170 /* 1171 * Since touch screen will set trigger register as period trigger. So 1172 * when touch screen is enabled, then we have to disable hardware 1173 * trigger for classic adc. 1174 */ 1175 if (!st->touchscreen_type) { 1176 ret = at91_adc_buffer_init(idev); 1177 if (ret < 0) { 1178 dev_err(&pdev->dev, "Couldn't initialize the buffer.\n"); 1179 goto error_disable_adc_clk; 1180 } 1181 1182 ret = at91_adc_trigger_init(idev); 1183 if (ret < 0) { 1184 dev_err(&pdev->dev, "Couldn't setup the triggers.\n"); 1185 at91_adc_buffer_remove(idev); 1186 goto error_disable_adc_clk; 1187 } 1188 } else { 1189 ret = at91_ts_register(idev, pdev); 1190 if (ret) 1191 goto error_disable_adc_clk; 1192 1193 at91_ts_hw_init(idev, adc_clk_khz); 1194 } 1195 1196 ret = iio_device_register(idev); 1197 if (ret < 0) { 1198 dev_err(&pdev->dev, "Couldn't register the device.\n"); 1199 goto error_iio_device_register; 1200 } 1201 1202 return 0; 1203 1204 error_iio_device_register: 1205 if (!st->touchscreen_type) { 1206 at91_adc_trigger_remove(idev); 1207 at91_adc_buffer_remove(idev); 1208 } else { 1209 at91_ts_unregister(st); 1210 } 1211 error_disable_adc_clk: 1212 clk_disable_unprepare(st->adc_clk); 1213 error_disable_clk: 1214 clk_disable_unprepare(st->clk); 1215 error_free_irq: 1216 free_irq(st->irq, idev); 1217 return ret; 1218 } 1219 1220 static int at91_adc_remove(struct platform_device *pdev) 1221 { 1222 struct iio_dev *idev = platform_get_drvdata(pdev); 1223 struct at91_adc_state *st = iio_priv(idev); 1224 1225 iio_device_unregister(idev); 1226 if (!st->touchscreen_type) { 1227 at91_adc_trigger_remove(idev); 1228 at91_adc_buffer_remove(idev); 1229 } else { 1230 at91_ts_unregister(st); 1231 } 1232 clk_disable_unprepare(st->adc_clk); 1233 clk_disable_unprepare(st->clk); 1234 free_irq(st->irq, idev); 1235 1236 return 0; 1237 } 1238 1239 static int at91_adc_suspend(struct device *dev) 1240 { 1241 struct iio_dev *idev = dev_get_drvdata(dev); 1242 struct at91_adc_state *st = iio_priv(idev); 1243 1244 pinctrl_pm_select_sleep_state(dev); 1245 clk_disable_unprepare(st->clk); 1246 1247 return 0; 1248 } 1249 1250 static int at91_adc_resume(struct device *dev) 1251 { 1252 struct iio_dev *idev = dev_get_drvdata(dev); 1253 struct at91_adc_state *st = iio_priv(idev); 1254 1255 clk_prepare_enable(st->clk); 1256 pinctrl_pm_select_default_state(dev); 1257 1258 return 0; 1259 } 1260 1261 static DEFINE_SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, 1262 at91_adc_resume); 1263 1264 static const struct at91_adc_trigger at91sam9260_triggers[] = { 1265 { .name = "timer-counter-0", .value = 0x1 }, 1266 { .name = "timer-counter-1", .value = 0x3 }, 1267 { .name = "timer-counter-2", .value = 0x5 }, 1268 { .name = "external", .value = 0xd, .is_external = true }, 1269 }; 1270 1271 static struct at91_adc_caps at91sam9260_caps = { 1272 .calc_startup_ticks = calc_startup_ticks_9260, 1273 .num_channels = 4, 1274 .low_res_bits = 8, 1275 .high_res_bits = 10, 1276 .registers = { 1277 .channel_base = AT91_ADC_CHR(0), 1278 .drdy_mask = AT91_ADC_DRDY, 1279 .status_register = AT91_ADC_SR, 1280 .trigger_register = AT91_ADC_TRGR_9260, 1281 .mr_prescal_mask = AT91_ADC_PRESCAL_9260, 1282 .mr_startup_mask = AT91_ADC_STARTUP_9260, 1283 }, 1284 .triggers = at91sam9260_triggers, 1285 .trigger_number = ARRAY_SIZE(at91sam9260_triggers), 1286 }; 1287 1288 static const struct at91_adc_trigger at91sam9x5_triggers[] = { 1289 { .name = "external-rising", .value = 0x1, .is_external = true }, 1290 { .name = "external-falling", .value = 0x2, .is_external = true }, 1291 { .name = "external-any", .value = 0x3, .is_external = true }, 1292 { .name = "continuous", .value = 0x6 }, 1293 }; 1294 1295 static struct at91_adc_caps at91sam9rl_caps = { 1296 .has_ts = true, 1297 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ 1298 .num_channels = 6, 1299 .low_res_bits = 8, 1300 .high_res_bits = 10, 1301 .registers = { 1302 .channel_base = AT91_ADC_CHR(0), 1303 .drdy_mask = AT91_ADC_DRDY, 1304 .status_register = AT91_ADC_SR, 1305 .trigger_register = AT91_ADC_TRGR_9G45, 1306 .mr_prescal_mask = AT91_ADC_PRESCAL_9260, 1307 .mr_startup_mask = AT91_ADC_STARTUP_9G45, 1308 }, 1309 .triggers = at91sam9x5_triggers, 1310 .trigger_number = ARRAY_SIZE(at91sam9x5_triggers), 1311 }; 1312 1313 static struct at91_adc_caps at91sam9g45_caps = { 1314 .has_ts = true, 1315 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ 1316 .num_channels = 8, 1317 .low_res_bits = 8, 1318 .high_res_bits = 10, 1319 .registers = { 1320 .channel_base = AT91_ADC_CHR(0), 1321 .drdy_mask = AT91_ADC_DRDY, 1322 .status_register = AT91_ADC_SR, 1323 .trigger_register = AT91_ADC_TRGR_9G45, 1324 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, 1325 .mr_startup_mask = AT91_ADC_STARTUP_9G45, 1326 }, 1327 .triggers = at91sam9x5_triggers, 1328 .trigger_number = ARRAY_SIZE(at91sam9x5_triggers), 1329 }; 1330 1331 static struct at91_adc_caps at91sam9x5_caps = { 1332 .has_ts = true, 1333 .has_tsmr = true, 1334 .ts_filter_average = 3, 1335 .ts_pen_detect_sensitivity = 2, 1336 .calc_startup_ticks = calc_startup_ticks_9x5, 1337 .num_channels = 12, 1338 .low_res_bits = 8, 1339 .high_res_bits = 10, 1340 .registers = { 1341 .channel_base = AT91_ADC_CDR0_9X5, 1342 .drdy_mask = AT91_ADC_SR_DRDY_9X5, 1343 .status_register = AT91_ADC_SR_9X5, 1344 .trigger_register = AT91_ADC_TRGR_9X5, 1345 /* prescal mask is same as 9G45 */ 1346 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, 1347 .mr_startup_mask = AT91_ADC_STARTUP_9X5, 1348 }, 1349 .triggers = at91sam9x5_triggers, 1350 .trigger_number = ARRAY_SIZE(at91sam9x5_triggers), 1351 }; 1352 1353 static struct at91_adc_caps sama5d3_caps = { 1354 .has_ts = true, 1355 .has_tsmr = true, 1356 .ts_filter_average = 3, 1357 .ts_pen_detect_sensitivity = 2, 1358 .calc_startup_ticks = calc_startup_ticks_9x5, 1359 .num_channels = 12, 1360 .low_res_bits = 0, 1361 .high_res_bits = 12, 1362 .registers = { 1363 .channel_base = AT91_ADC_CDR0_9X5, 1364 .drdy_mask = AT91_ADC_SR_DRDY_9X5, 1365 .status_register = AT91_ADC_SR_9X5, 1366 .trigger_register = AT91_ADC_TRGR_9X5, 1367 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, 1368 .mr_startup_mask = AT91_ADC_STARTUP_9X5, 1369 }, 1370 .triggers = at91sam9x5_triggers, 1371 .trigger_number = ARRAY_SIZE(at91sam9x5_triggers), 1372 }; 1373 1374 static const struct of_device_id at91_adc_dt_ids[] = { 1375 { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps }, 1376 { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps }, 1377 { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps }, 1378 { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps }, 1379 { .compatible = "atmel,sama5d3-adc", .data = &sama5d3_caps }, 1380 {}, 1381 }; 1382 MODULE_DEVICE_TABLE(of, at91_adc_dt_ids); 1383 1384 static struct platform_driver at91_adc_driver = { 1385 .probe = at91_adc_probe, 1386 .remove = at91_adc_remove, 1387 .driver = { 1388 .name = DRIVER_NAME, 1389 .of_match_table = at91_adc_dt_ids, 1390 .pm = pm_sleep_ptr(&at91_adc_pm_ops), 1391 }, 1392 }; 1393 1394 module_platform_driver(at91_adc_driver); 1395 1396 MODULE_LICENSE("GPL"); 1397 MODULE_DESCRIPTION("Atmel AT91 ADC Driver"); 1398 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 1399