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[mirror_ubuntu-bionic-kernel.git] / drivers / iio / adc / at91_adc.c
CommitLineData
0e589d5f
MR		 1/*
2 * Driver for the ADC present in the Atmel AT91 evaluation boards.
3 *
4 * Copyright 2011 Free Electrons
5 *
6 * Licensed under the GPLv2 or later.
7 */
8
9#include <linux/bitmap.h>
10#include <linux/bitops.h>
11#include <linux/clk.h>
12#include <linux/err.h>
13#include <linux/io.h>
c8b11de0 14#include <linux/input.h>
0e589d5f
MR		 15#include <linux/interrupt.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
e364185f
MR		 19#include <linux/of.h>
20#include <linux/of_device.h>
0e589d5f
MR		 21#include <linux/platform_device.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/wait.h>
25
26#include <linux/platform_data/at91_adc.h>
27
28#include <linux/iio/iio.h>
29#include <linux/iio/buffer.h>
0e589d5f
MR		 30#include <linux/iio/trigger.h>
31#include <linux/iio/trigger_consumer.h>
90032e4e 32#include <linux/iio/triggered_buffer.h>
0e589d5f 33
bee20c4b
AB		 34/* Registers */
35#define AT91_ADC_CR 0x00 /* Control Register */
36#define AT91_ADC_SWRST (1 << 0) /* Software Reset */
37#define AT91_ADC_START (1 << 1) /* Start Conversion */
38
39#define AT91_ADC_MR 0x04 /* Mode Register */
40#define AT91_ADC_TSAMOD (3 << 0) /* ADC mode */
41#define AT91_ADC_TSAMOD_ADC_ONLY_MODE (0 << 0) /* ADC Mode */
42#define AT91_ADC_TSAMOD_TS_ONLY_MODE (1 << 0) /* Touch Screen Only Mode */
43#define AT91_ADC_TRGEN (1 << 0) /* Trigger Enable */
44#define AT91_ADC_TRGSEL (7 << 1) /* Trigger Selection */
45#define AT91_ADC_TRGSEL_TC0 (0 << 1)
46#define AT91_ADC_TRGSEL_TC1 (1 << 1)
47#define AT91_ADC_TRGSEL_TC2 (2 << 1)
48#define AT91_ADC_TRGSEL_EXTERNAL (6 << 1)
49#define AT91_ADC_LOWRES (1 << 4) /* Low Resolution */
50#define AT91_ADC_SLEEP (1 << 5) /* Sleep Mode */
51#define AT91_ADC_PENDET (1 << 6) /* Pen contact detection enable */
52#define AT91_ADC_PRESCAL_9260 (0x3f << 8) /* Prescalar Rate Selection */
53#define AT91_ADC_PRESCAL_9G45 (0xff << 8)
54#define AT91_ADC_PRESCAL_(x) ((x) << 8)
55#define AT91_ADC_STARTUP_9260 (0x1f << 16) /* Startup Up Time */
56#define AT91_ADC_STARTUP_9G45 (0x7f << 16)
57#define AT91_ADC_STARTUP_9X5 (0xf << 16)
58#define AT91_ADC_STARTUP_(x) ((x) << 16)
59#define AT91_ADC_SHTIM (0xf << 24) /* Sample & Hold Time */
60#define AT91_ADC_SHTIM_(x) ((x) << 24)
61#define AT91_ADC_PENDBC (0x0f << 28) /* Pen Debounce time */
62#define AT91_ADC_PENDBC_(x) ((x) << 28)
63
64#define AT91_ADC_TSR 0x0C
65#define AT91_ADC_TSR_SHTIM (0xf << 24) /* Sample & Hold Time */
66#define AT91_ADC_TSR_SHTIM_(x) ((x) << 24)
67
68#define AT91_ADC_CHER 0x10 /* Channel Enable Register */
69#define AT91_ADC_CHDR 0x14 /* Channel Disable Register */
70#define AT91_ADC_CHSR 0x18 /* Channel Status Register */
71#define AT91_ADC_CH(n) (1 << (n)) /* Channel Number */
72
73#define AT91_ADC_SR 0x1C /* Status Register */
74#define AT91_ADC_EOC(n) (1 << (n)) /* End of Conversion on Channel N */
75#define AT91_ADC_OVRE(n) (1 << ((n) + 8))/* Overrun Error on Channel N */
76#define AT91_ADC_DRDY (1 << 16) /* Data Ready */
77#define AT91_ADC_GOVRE (1 << 17) /* General Overrun Error */
78#define AT91_ADC_ENDRX (1 << 18) /* End of RX Buffer */
79#define AT91_ADC_RXFUFF (1 << 19) /* RX Buffer Full */
80
81#define AT91_ADC_SR_9X5 0x30 /* Status Register for 9x5 */
82#define AT91_ADC_SR_DRDY_9X5 (1 << 24) /* Data Ready */
83
84#define AT91_ADC_LCDR 0x20 /* Last Converted Data Register */
85#define AT91_ADC_LDATA (0x3ff)
86
87#define AT91_ADC_IER 0x24 /* Interrupt Enable Register */
88#define AT91_ADC_IDR 0x28 /* Interrupt Disable Register */
89#define AT91_ADC_IMR 0x2C /* Interrupt Mask Register */
90#define AT91RL_ADC_IER_PEN (1 << 20)
91#define AT91RL_ADC_IER_NOPEN (1 << 21)
92#define AT91_ADC_IER_PEN (1 << 29)
93#define AT91_ADC_IER_NOPEN (1 << 30)
94#define AT91_ADC_IER_XRDY (1 << 20)
95#define AT91_ADC_IER_YRDY (1 << 21)
96#define AT91_ADC_IER_PRDY (1 << 22)
97#define AT91_ADC_ISR_PENS (1 << 31)
98
99#define AT91_ADC_CHR(n) (0x30 + ((n) * 4)) /* Channel Data Register N */
100#define AT91_ADC_DATA (0x3ff)
101
102#define AT91_ADC_CDR0_9X5 (0x50) /* Channel Data Register 0 for 9X5 */
103
104#define AT91_ADC_ACR 0x94 /* Analog Control Register */
105#define AT91_ADC_ACR_PENDETSENS (0x3 << 0) /* pull-up resistor */
106
107#define AT91_ADC_TSMR 0xB0
108#define AT91_ADC_TSMR_TSMODE (3 << 0) /* Touch Screen Mode */
109#define AT91_ADC_TSMR_TSMODE_NONE (0 << 0)
110#define AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS (1 << 0)
111#define AT91_ADC_TSMR_TSMODE_4WIRE_PRESS (2 << 0)
112#define AT91_ADC_TSMR_TSMODE_5WIRE (3 << 0)
113#define AT91_ADC_TSMR_TSAV (3 << 4) /* Averages samples */
114#define AT91_ADC_TSMR_TSAV_(x) ((x) << 4)
115#define AT91_ADC_TSMR_SCTIM (0x0f << 16) /* Switch closure time */
116#define AT91_ADC_TSMR_PENDBC (0x0f << 28) /* Pen Debounce time */
117#define AT91_ADC_TSMR_PENDBC_(x) ((x) << 28)
118#define AT91_ADC_TSMR_NOTSDMA (1 << 22) /* No Touchscreen DMA */
119#define AT91_ADC_TSMR_PENDET_DIS (0 << 24) /* Pen contact detection disable */
120#define AT91_ADC_TSMR_PENDET_ENA (1 << 24) /* Pen contact detection enable */
121
122#define AT91_ADC_TSXPOSR 0xB4
123#define AT91_ADC_TSYPOSR 0xB8
124#define AT91_ADC_TSPRESSR 0xBC
125
126#define AT91_ADC_TRGR_9260 AT91_ADC_MR
127#define AT91_ADC_TRGR_9G45 0x08
128#define AT91_ADC_TRGR_9X5 0xC0
129
130/* Trigger Register bit field */
131#define AT91_ADC_TRGR_TRGPER (0xffff << 16)
132#define AT91_ADC_TRGR_TRGPER_(x) ((x) << 16)
133#define AT91_ADC_TRGR_TRGMOD (0x7 << 0)
134#define AT91_ADC_TRGR_NONE (0 << 0)
135#define AT91_ADC_TRGR_MOD_PERIOD_TRIG (5 << 0)
0e589d5f
MR		 136
137#define AT91_ADC_CHAN(st, ch) \
138 (st->registers->channel_base + (ch * 4))
139#define at91_adc_readl(st, reg) \
140 (readl_relaxed(st->reg_base + reg))
141#define at91_adc_writel(st, reg, val) \
142 (writel_relaxed(val, st->reg_base + reg))
143
c8b11de0
JW		 144#define DRIVER_NAME "at91_adc"
145#define MAX_POS_BITS 12
146
147#define TOUCH_SAMPLE_PERIOD_US 2000 /* 2ms */
148#define TOUCH_PEN_DETECT_DEBOUNCE_US 200
149
84882b06
AB		 150#define MAX_RLPOS_BITS 10
151#define TOUCH_SAMPLE_PERIOD_US_RL 10000 /* 10ms, the SoC can't keep up with 2ms */
152#define TOUCH_SHTIM 0xa
153
2de0c019
AB		 154/**
155 * struct at91_adc_reg_desc - Various informations relative to registers
156 * @channel_base: Base offset for the channel data registers
157 * @drdy_mask: Mask of the DRDY field in the relevant registers
158 (Interruptions registers mostly)
159 * @status_register: Offset of the Interrupt Status Register
160 * @trigger_register: Offset of the Trigger setup register
161 * @mr_prescal_mask: Mask of the PRESCAL field in the adc MR register
162 * @mr_startup_mask: Mask of the STARTUP field in the adc MR register
163 */
164struct at91_adc_reg_desc {
165 u8 channel_base;
166 u32 drdy_mask;
167 u8 status_register;
168 u8 trigger_register;
169 u32 mr_prescal_mask;
170 u32 mr_startup_mask;
171};
172
e1811f97 173struct at91_adc_caps {
c8b11de0
JW		 174 bool has_ts; /* Support touch screen */
175 bool has_tsmr; /* only at91sam9x5, sama5d3 have TSMR reg */
176 /*
177 * Numbers of sampling data will be averaged. Can be 0~3.
178 * Hardware can average (2 ^ ts_filter_average) sample data.
179 */
180 u8 ts_filter_average;
181 /* Pen Detection input pull-up resistor, can be 0~3 */
182 u8 ts_pen_detect_sensitivity;
183
c4601666 184 /* startup time calculate function */
2ab5f39b 185 u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz);
c4601666 186
2b6d598b 187 u8 num_channels;
e1811f97
JW		 188 struct at91_adc_reg_desc registers;
189};
190
0e589d5f
MR		 191struct at91_adc_state {
192 struct clk *adc_clk;
193 u16 *buffer;
194 unsigned long channels_mask;
195 struct clk *clk;
196 bool done;
197 int irq;
0e589d5f 198 u16 last_value;
d4f51956 199 int chnb;
0e589d5f
MR		 200 struct mutex lock;
201 u8 num_channels;
202 void __iomem *reg_base;
203 struct at91_adc_reg_desc *registers;
2ab5f39b 204 u32 startup_time;
beca9e76 205 u8 sample_hold_time;
e748783c 206 bool sleep_mode;
0e589d5f
MR		 207 struct iio_trigger **trig;
208 struct at91_adc_trigger *trigger_list;
209 u32 trigger_number;
210 bool use_external;
211 u32 vref_mv;
47be16b6
LD		 212 u32 res; /* resolution used for convertions */
213 bool low_res; /* the resolution corresponds to the lowest one */
0e589d5f 214 wait_queue_head_t wq_data_avail;
e1811f97 215 struct at91_adc_caps *caps;
c8b11de0
JW		 216
217 /*
218 * Following ADC channels are shared by touchscreen:
219 *
220 * CH0 -- Touch screen XP/UL
221 * CH1 -- Touch screen XM/UR
222 * CH2 -- Touch screen YP/LL
223 * CH3 -- Touch screen YM/Sense
224 * CH4 -- Touch screen LR(5-wire only)
225 *
226 * The bitfields below represents the reserved channel in the
227 * touchscreen mode.
228 */
229#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 0)
230#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 0)
231 enum atmel_adc_ts_type touchscreen_type;
232 struct input_dev *ts_input;
233
234 u16 ts_sample_period_val;
235 u32 ts_pressure_threshold;
84882b06
AB		 236 u16 ts_pendbc;
237
238 bool ts_bufferedmeasure;
239 u32 ts_prev_absx;
240 u32 ts_prev_absy;
0e589d5f
MR		 241};
242
243static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
244{
245 struct iio_poll_func *pf = p;
246 struct iio_dev *idev = pf->indio_dev;
247 struct at91_adc_state *st = iio_priv(idev);
0e589d5f
MR		 248 int i, j = 0;
249
250 for (i = 0; i < idev->masklength; i++) {
251 if (!test_bit(i, idev->active_scan_mask))
252 continue;
253 st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, i));
254 j++;
255 }
256
e79cece0 257 iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp);
0e589d5f
MR		 258
259 iio_trigger_notify_done(idev->trig);
0e589d5f
MR		 260
261 /* Needed to ACK the DRDY interruption */
262 at91_adc_readl(st, AT91_ADC_LCDR);
263
264 enable_irq(st->irq);
265
266 return IRQ_HANDLED;
267}
268
c8b11de0 269/* Handler for classic adc channel eoc trigger */
3068ab20 270static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev)
0e589d5f 271{
0e589d5f 272 struct at91_adc_state *st = iio_priv(idev);
0e589d5f
MR		 273
274 if (iio_buffer_enabled(idev)) {
275 disable_irq_nosync(irq);
398fd22b 276 iio_trigger_poll(idev->trig);
0e589d5f 277 } else {
d4f51956 278 st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb));
0e589d5f
MR		 279 st->done = true;
280 wake_up_interruptible(&st->wq_data_avail);
281 }
c8b11de0
JW		 282}
283
284static int at91_ts_sample(struct at91_adc_state *st)
285{
286 unsigned int xscale, yscale, reg, z1, z2;
287 unsigned int x, y, pres, xpos, ypos;
288 unsigned int rxp = 1;
289 unsigned int factor = 1000;
290 struct iio_dev *idev = iio_priv_to_dev(st);
291
292 unsigned int xyz_mask_bits = st->res;
293 unsigned int xyz_mask = (1 << xyz_mask_bits) - 1;
294
295 /* calculate position */
296 /* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */
297 reg = at91_adc_readl(st, AT91_ADC_TSXPOSR);
298 xpos = reg & xyz_mask;
299 x = (xpos << MAX_POS_BITS) - xpos;
300 xscale = (reg >> 16) & xyz_mask;
301 if (xscale == 0) {
302 dev_err(&idev->dev, "Error: xscale == 0!\n");
303 return -1;
304 }
305 x /= xscale;
306
307 /* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */
308 reg = at91_adc_readl(st, AT91_ADC_TSYPOSR);
309 ypos = reg & xyz_mask;
310 y = (ypos << MAX_POS_BITS) - ypos;
311 yscale = (reg >> 16) & xyz_mask;
312 if (yscale == 0) {
313 dev_err(&idev->dev, "Error: yscale == 0!\n");
314 return -1;
315 }
316 y /= yscale;
317
318 /* calculate the pressure */
319 reg = at91_adc_readl(st, AT91_ADC_TSPRESSR);
320 z1 = reg & xyz_mask;
321 z2 = (reg >> 16) & xyz_mask;
322
323 if (z1 != 0)
324 pres = rxp * (x * factor / 1024) * (z2 * factor / z1 - factor)
325 / factor;
326 else
327 pres = st->ts_pressure_threshold; /* no pen contacted */
328
329 dev_dbg(&idev->dev, "xpos = %d, xscale = %d, ypos = %d, yscale = %d, z1 = %d, z2 = %d, press = %d\n",
330 xpos, xscale, ypos, yscale, z1, z2, pres);
331
332 if (pres < st->ts_pressure_threshold) {
333 dev_dbg(&idev->dev, "x = %d, y = %d, pressure = %d\n",
334 x, y, pres / factor);
335 input_report_abs(st->ts_input, ABS_X, x);
336 input_report_abs(st->ts_input, ABS_Y, y);
337 input_report_abs(st->ts_input, ABS_PRESSURE, pres);
338 input_report_key(st->ts_input, BTN_TOUCH, 1);
339 input_sync(st->ts_input);
340 } else {
341 dev_dbg(&idev->dev, "pressure too low: not reporting\n");
342 }
343
344 return 0;
345}
346
84882b06
AB		 347static irqreturn_t at91_adc_rl_interrupt(int irq, void *private)
348{
349 struct iio_dev *idev = private;
350 struct at91_adc_state *st = iio_priv(idev);
351 u32 status = at91_adc_readl(st, st->registers->status_register);
352 unsigned int reg;
353
354 status &= at91_adc_readl(st, AT91_ADC_IMR);
d4f51956 355 if (status & GENMASK(st->num_channels - 1, 0))
84882b06
AB		 356 handle_adc_eoc_trigger(irq, idev);
357
358 if (status & AT91RL_ADC_IER_PEN) {
359 /* Disabling pen debounce is required to get a NOPEN irq */
360 reg = at91_adc_readl(st, AT91_ADC_MR);
361 reg &= ~AT91_ADC_PENDBC;
362 at91_adc_writel(st, AT91_ADC_MR, reg);
363
364 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);
365 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_NOPEN
366 | AT91_ADC_EOC(3));
367 /* Set up period trigger for sampling */
368 at91_adc_writel(st, st->registers->trigger_register,
369 AT91_ADC_TRGR_MOD_PERIOD_TRIG |
370 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));
371 } else if (status & AT91RL_ADC_IER_NOPEN) {
372 reg = at91_adc_readl(st, AT91_ADC_MR);
373 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;
374 at91_adc_writel(st, AT91_ADC_MR, reg);
375 at91_adc_writel(st, st->registers->trigger_register,
376 AT91_ADC_TRGR_NONE);
377
378 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_NOPEN
379 | AT91_ADC_EOC(3));
380 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);
381 st->ts_bufferedmeasure = false;
382 input_report_key(st->ts_input, BTN_TOUCH, 0);
383 input_sync(st->ts_input);
c2ab4474
AD		 384 } else if (status & AT91_ADC_EOC(3) && st->ts_input) {
385 /* Conversion finished and we've a touchscreen */
84882b06
AB		 386 if (st->ts_bufferedmeasure) {
387 /*
388 * Last measurement is always discarded, since it can
389 * be erroneous.
390 * Always report previous measurement
391 */
392 input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx);
393 input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy);
394 input_report_key(st->ts_input, BTN_TOUCH, 1);
395 input_sync(st->ts_input);
396 } else
397 st->ts_bufferedmeasure = true;
398
399 /* Now make new measurement */
400 st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3))
401 << MAX_RLPOS_BITS;
402 st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2));
403
404 st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1))
405 << MAX_RLPOS_BITS;
406 st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0));
407 }
408
409 return IRQ_HANDLED;
410}
411
412static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private)
c8b11de0
JW		 413{
414 struct iio_dev *idev = private;
415 struct at91_adc_state *st = iio_priv(idev);
416 u32 status = at91_adc_readl(st, st->registers->status_register);
417 const uint32_t ts_data_irq_mask =
418 AT91_ADC_IER_XRDY |
419 AT91_ADC_IER_YRDY |
420 AT91_ADC_IER_PRDY;
421
d4f51956 422 if (status & GENMASK(st->num_channels - 1, 0))
c8b11de0
JW		 423 handle_adc_eoc_trigger(irq, idev);
424
425 if (status & AT91_ADC_IER_PEN) {
426 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);
427 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_NOPEN |
428 ts_data_irq_mask);
429 /* Set up period trigger for sampling */
430 at91_adc_writel(st, st->registers->trigger_register,
431 AT91_ADC_TRGR_MOD_PERIOD_TRIG |
432 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));
433 } else if (status & AT91_ADC_IER_NOPEN) {
434 at91_adc_writel(st, st->registers->trigger_register, 0);
435 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_NOPEN |
436 ts_data_irq_mask);
437 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);
438
439 input_report_key(st->ts_input, BTN_TOUCH, 0);
440 input_sync(st->ts_input);
441 } else if ((status & ts_data_irq_mask) == ts_data_irq_mask) {
442 /* Now all touchscreen data is ready */
443
444 if (status & AT91_ADC_ISR_PENS) {
445 /* validate data by pen contact */
446 at91_ts_sample(st);
447 } else {
448 /* triggered by event that is no pen contact, just read
449 * them to clean the interrupt and discard all.
450 */
451 at91_adc_readl(st, AT91_ADC_TSXPOSR);
452 at91_adc_readl(st, AT91_ADC_TSYPOSR);
453 at91_adc_readl(st, AT91_ADC_TSPRESSR);
454 }
455 }
0e589d5f
MR		 456
457 return IRQ_HANDLED;
458}
459
460static int at91_adc_channel_init(struct iio_dev *idev)
461{
462 struct at91_adc_state *st = iio_priv(idev);
463 struct iio_chan_spec *chan_array, *timestamp;
464 int bit, idx = 0;
c8b11de0
JW		 465 unsigned long rsvd_mask = 0;
466
467 /* If touchscreen is enable, then reserve the adc channels */
468 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)
469 rsvd_mask = CHAN_MASK_TOUCHSCREEN_4WIRE;
470 else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE)
471 rsvd_mask = CHAN_MASK_TOUCHSCREEN_5WIRE;
472
473 /* set up the channel mask to reserve touchscreen channels */
474 st->channels_mask &= ~rsvd_mask;
0e589d5f
MR		 475
476 idev->num_channels = bitmap_weight(&st->channels_mask,
477 st->num_channels) + 1;
478
6b3aa313
AL		 479 chan_array = devm_kzalloc(&idev->dev,
480 ((idev->num_channels + 1) *
481 sizeof(struct iio_chan_spec)),
482 GFP_KERNEL);
0e589d5f
MR		 483
484 if (!chan_array)
485 return -ENOMEM;
486
487 for_each_set_bit(bit, &st->channels_mask, st->num_channels) {
488 struct iio_chan_spec *chan = chan_array + idx;
489
490 chan->type = IIO_VOLTAGE;
491 chan->indexed = 1;
492 chan->channel = bit;
493 chan->scan_index = idx;
494 chan->scan_type.sign = 'u';
47be16b6 495 chan->scan_type.realbits = st->res;
0e589d5f 496 chan->scan_type.storagebits = 16;
01bdab66
JC		 497 chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
498 chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
0e589d5f
MR		 499 idx++;
500 }
501 timestamp = chan_array + idx;
502
503 timestamp->type = IIO_TIMESTAMP;
504 timestamp->channel = -1;
505 timestamp->scan_index = idx;
506 timestamp->scan_type.sign = 's';
507 timestamp->scan_type.realbits = 64;
508 timestamp->scan_type.storagebits = 64;
509
510 idev->channels = chan_array;
511 return idev->num_channels;
512}
513
4f3bcd87 514static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
0e589d5f
MR		 515 struct at91_adc_trigger *triggers,
516 const char *trigger_name)
517{
518 struct at91_adc_state *st = iio_priv(idev);
0e589d5f
MR		 519 int i;
520
521 for (i = 0; i < st->trigger_number; i++) {
522 char *name = kasprintf(GFP_KERNEL,
523 "%s-dev%d-%s",
524 idev->name,
525 idev->id,
526 triggers[i].name);
527 if (!name)
528 return -ENOMEM;
529
530 if (strcmp(trigger_name, name) == 0) {
0e589d5f 531 kfree(name);
4f3bcd87
DC		 532 if (triggers[i].value == 0)
533 return -EINVAL;
534 return triggers[i].value;
0e589d5f
MR		 535 }
536
537 kfree(name);
538 }
539
4f3bcd87 540 return -EINVAL;
0e589d5f
MR		 541}
542
543static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
544{
1e9663c6 545 struct iio_dev *idev = iio_trigger_get_drvdata(trig);
0e589d5f 546 struct at91_adc_state *st = iio_priv(idev);
0e589d5f
MR		 547 struct at91_adc_reg_desc *reg = st->registers;
548 u32 status = at91_adc_readl(st, reg->trigger_register);
4f3bcd87 549 int value;
0e589d5f
MR		 550 u8 bit;
551
552 value = at91_adc_get_trigger_value_by_name(idev,
553 st->trigger_list,
554 idev->trig->name);
4f3bcd87
DC		 555 if (value < 0)
556 return value;
0e589d5f
MR		 557
558 if (state) {
559 st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL);
560 if (st->buffer == NULL)
561 return -ENOMEM;
562
563 at91_adc_writel(st, reg->trigger_register,
564 status | value);
565
70dddeee 566 for_each_set_bit(bit, idev->active_scan_mask,
0e589d5f
MR		 567 st->num_channels) {
568 struct iio_chan_spec const *chan = idev->channels + bit;
569 at91_adc_writel(st, AT91_ADC_CHER,
570 AT91_ADC_CH(chan->channel));
571 }
572
573 at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask);
574
575 } else {
576 at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask);
577
578 at91_adc_writel(st, reg->trigger_register,
579 status & ~value);
580
70dddeee 581 for_each_set_bit(bit, idev->active_scan_mask,
0e589d5f
MR		 582 st->num_channels) {
583 struct iio_chan_spec const *chan = idev->channels + bit;
584 at91_adc_writel(st, AT91_ADC_CHDR,
585 AT91_ADC_CH(chan->channel));
586 }
587 kfree(st->buffer);
588 }
589
590 return 0;
591}
592
593static const struct iio_trigger_ops at91_adc_trigger_ops = {
594 .owner = THIS_MODULE,
595 .set_trigger_state = &at91_adc_configure_trigger,
596};
597
598static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev,
599 struct at91_adc_trigger *trigger)
600{
601 struct iio_trigger *trig;
602 int ret;
603
604 trig = iio_trigger_alloc("%s-dev%d-%s", idev->name,
605 idev->id, trigger->name);
606 if (trig == NULL)
607 return NULL;
608
609 trig->dev.parent = idev->dev.parent;
1e9663c6 610 iio_trigger_set_drvdata(trig, idev);
0e589d5f
MR		 611 trig->ops = &at91_adc_trigger_ops;
612
613 ret = iio_trigger_register(trig);
614 if (ret)
615 return NULL;
616
617 return trig;
618}
619
620static int at91_adc_trigger_init(struct iio_dev *idev)
621{
622 struct at91_adc_state *st = iio_priv(idev);
623 int i, ret;
624
6b3aa313 625 st->trig = devm_kzalloc(&idev->dev,
42877236 626 st->trigger_number * sizeof(*st->trig),
6b3aa313 627 GFP_KERNEL);
0e589d5f
MR		 628
629 if (st->trig == NULL) {
630 ret = -ENOMEM;
631 goto error_ret;
632 }
633
634 for (i = 0; i < st->trigger_number; i++) {
635 if (st->trigger_list[i].is_external && !(st->use_external))
636 continue;
637
638 st->trig[i] = at91_adc_allocate_trigger(idev,
639 st->trigger_list + i);
640 if (st->trig[i] == NULL) {
641 dev_err(&idev->dev,
642 "Could not allocate trigger %d\n", i);
643 ret = -ENOMEM;
644 goto error_trigger;
645 }
646 }
647
648 return 0;
649
650error_trigger:
651 for (i--; i >= 0; i--) {
652 iio_trigger_unregister(st->trig[i]);
653 iio_trigger_free(st->trig[i]);
654 }
655error_ret:
656 return ret;
657}
658
659static void at91_adc_trigger_remove(struct iio_dev *idev)
660{
661 struct at91_adc_state *st = iio_priv(idev);
662 int i;
663
664 for (i = 0; i < st->trigger_number; i++) {
665 iio_trigger_unregister(st->trig[i]);
666 iio_trigger_free(st->trig[i]);
667 }
668}
669
0e589d5f
MR		 670static int at91_adc_buffer_init(struct iio_dev *idev)
671{
90032e4e
LPC		 672 return iio_triggered_buffer_setup(idev, &iio_pollfunc_store_time,
673 &at91_adc_trigger_handler, NULL);
0e589d5f
MR		 674}
675
676static void at91_adc_buffer_remove(struct iio_dev *idev)
677{
90032e4e 678 iio_triggered_buffer_cleanup(idev);
0e589d5f
MR		 679}
680
681static int at91_adc_read_raw(struct iio_dev *idev,
682 struct iio_chan_spec const *chan,
683 int *val, int *val2, long mask)
684{
685 struct at91_adc_state *st = iio_priv(idev);
686 int ret;
687
688 switch (mask) {
689 case IIO_CHAN_INFO_RAW:
690 mutex_lock(&st->lock);
691
d4f51956 692 st->chnb = chan->channel;
0e589d5f
MR		 693 at91_adc_writel(st, AT91_ADC_CHER,
694 AT91_ADC_CH(chan->channel));
d4f51956 695 at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel));
0e589d5f
MR		 696 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START);
697
698 ret = wait_event_interruptible_timeout(st->wq_data_avail,
699 st->done,
700 msecs_to_jiffies(1000));
701 if (ret == 0)
90e6dc7c
LPC		 702 ret = -ETIMEDOUT;
703 if (ret < 0) {
704 mutex_unlock(&st->lock);
0e589d5f 705 return ret;
90e6dc7c 706 }
0e589d5f
MR		 707
708 *val = st->last_value;
709
710 at91_adc_writel(st, AT91_ADC_CHDR,
711 AT91_ADC_CH(chan->channel));
d4f51956 712 at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel));
0e589d5f
MR		 713
714 st->last_value = 0;
715 st->done = false;
716 mutex_unlock(&st->lock);
717 return IIO_VAL_INT;
718
719 case IIO_CHAN_INFO_SCALE:
c45e561e
LPC		 720 *val = st->vref_mv;
721 *val2 = chan->scan_type.realbits;
722 return IIO_VAL_FRACTIONAL_LOG2;
0e589d5f
MR		 723 default:
724 break;
725 }
726 return -EINVAL;
727}
728
47be16b6
LD		 729static int at91_adc_of_get_resolution(struct at91_adc_state *st,
730 struct platform_device *pdev)
731{
732 struct iio_dev *idev = iio_priv_to_dev(st);
733 struct device_node *np = pdev->dev.of_node;
734 int count, i, ret = 0;
735 char *res_name, *s;
736 u32 *resolutions;
737
738 count = of_property_count_strings(np, "atmel,adc-res-names");
739 if (count < 2) {
740 dev_err(&idev->dev, "You must specified at least two resolution names for "
741 "adc-res-names property in the DT\n");
742 return count;
743 }
744
3fba9b5f 745 resolutions = kmalloc_array(count, sizeof(*resolutions), GFP_KERNEL);
47be16b6
LD		 746 if (!resolutions)
747 return -ENOMEM;
748
749 if (of_property_read_u32_array(np, "atmel,adc-res", resolutions, count)) {
750 dev_err(&idev->dev, "Missing adc-res property in the DT.\n");
751 ret = -ENODEV;
752 goto ret;
753 }
754
755 if (of_property_read_string(np, "atmel,adc-use-res", (const char **)&res_name))
756 res_name = "highres";
757
758 for (i = 0; i < count; i++) {
759 if (of_property_read_string_index(np, "atmel,adc-res-names", i, (const char **)&s))
760 continue;
761
762 if (strcmp(res_name, s))
763 continue;
764
765 st->res = resolutions[i];
766 if (!strcmp(res_name, "lowres"))
767 st->low_res = true;
768 else
769 st->low_res = false;
770
771 dev_info(&idev->dev, "Resolution used: %u bits\n", st->res);
772 goto ret;
773 }
774
775 dev_err(&idev->dev, "There is no resolution for %s\n", res_name);
776
777ret:
778 kfree(resolutions);
779 return ret;
780}
781
2ab5f39b 782static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz)
c4601666
JW		 783{
784 /*
785 * Number of ticks needed to cover the startup time of the ADC
786 * as defined in the electrical characteristics of the board,
787 * divided by 8. The formula thus is :
788 * Startup Time = (ticks + 1) * 8 / ADC Clock
789 */
790 return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8;
791}
792
2ab5f39b 793static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz)
c4601666
JW		 794{
795 /*
796 * For sama5d3x and at91sam9x5, the formula changes to:
797 * Startup Time = <lookup_table_value> / ADC Clock
798 */
799 const int startup_lookup[] = {
4c79dd00
SS		 800 0, 8, 16, 24,
801 64, 80, 96, 112,
c4601666
JW		 802 512, 576, 640, 704,
803 768, 832, 896, 960
804 };
805 int i, size = ARRAY_SIZE(startup_lookup);
806 unsigned int ticks;
807
808 ticks = startup_time * adc_clk_khz / 1000;
809 for (i = 0; i < size; i++)
810 if (ticks < startup_lookup[i])
811 break;
812
813 ticks = i;
814 if (ticks == size)
815 /* Reach the end of lookup table */
816 ticks = size - 1;
817
818 return ticks;
819}
820
e1811f97
JW		 821static const struct of_device_id at91_adc_dt_ids[];
822
c8b11de0
JW		 823static int at91_adc_probe_dt_ts(struct device_node *node,
824 struct at91_adc_state *st, struct device *dev)
825{
826 int ret;
827 u32 prop;
828
829 ret = of_property_read_u32(node, "atmel,adc-ts-wires", &prop);
830 if (ret) {
831 dev_info(dev, "ADC Touch screen is disabled.\n");
832 return 0;
833 }
834
835 switch (prop) {
836 case 4:
837 case 5:
838 st->touchscreen_type = prop;
839 break;
840 default:
841 dev_err(dev, "Unsupported number of touchscreen wires (%d). Should be 4 or 5.\n", prop);
842 return -EINVAL;
843 }
844
84882b06
AB		 845 if (!st->caps->has_tsmr)
846 return 0;
c8b11de0
JW		 847 prop = 0;
848 of_property_read_u32(node, "atmel,adc-ts-pressure-threshold", &prop);
849 st->ts_pressure_threshold = prop;
850 if (st->ts_pressure_threshold) {
851 return 0;
852 } else {
853 dev_err(dev, "Invalid pressure threshold for the touchscreen\n");
854 return -EINVAL;
855 }
856}
857
e364185f
MR		 858static int at91_adc_probe_dt(struct at91_adc_state *st,
859 struct platform_device *pdev)
860{
861 struct iio_dev *idev = iio_priv_to_dev(st);
862 struct device_node *node = pdev->dev.of_node;
863 struct device_node *trig_node;
864 int i = 0, ret;
865 u32 prop;
866
867 if (!node)
868 return -EINVAL;
869
e1811f97
JW		 870 st->caps = (struct at91_adc_caps *)
871 of_match_device(at91_adc_dt_ids, &pdev->dev)->data;
872
e364185f
MR		 873 st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
874
875 if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {
876 dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n");
877 ret = -EINVAL;
878 goto error_ret;
879 }
880 st->channels_mask = prop;
881
e748783c
JCPV		 882 st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");
883
e364185f
MR		 884 if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
885 dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");
886 ret = -EINVAL;
887 goto error_ret;
888 }
889 st->startup_time = prop;
890
beca9e76
JCPV		 891 prop = 0;
892 of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop);
893 st->sample_hold_time = prop;
e364185f
MR		 894
895 if (of_property_read_u32(node, "atmel,adc-vref", &prop)) {
896 dev_err(&idev->dev, "Missing adc-vref property in the DT.\n");
897 ret = -EINVAL;
898 goto error_ret;
899 }
900 st->vref_mv = prop;
901
47be16b6
LD		 902 ret = at91_adc_of_get_resolution(st, pdev);
903 if (ret)
904 goto error_ret;
905
e1811f97 906 st->registers = &st->caps->registers;
2b6d598b 907 st->num_channels = st->caps->num_channels;
e364185f 908 st->trigger_number = of_get_child_count(node);
6b3aa313
AL		 909 st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
910 sizeof(struct at91_adc_trigger),
911 GFP_KERNEL);
e364185f
MR		 912 if (!st->trigger_list) {
913 dev_err(&idev->dev, "Could not allocate trigger list memory.\n");
914 ret = -ENOMEM;
915 goto error_ret;
916 }
917
918 for_each_child_of_node(node, trig_node) {
919 struct at91_adc_trigger *trig = st->trigger_list + i;
920 const char *name;
921
922 if (of_property_read_string(trig_node, "trigger-name", &name)) {
923 dev_err(&idev->dev, "Missing trigger-name property in the DT.\n");
924 ret = -EINVAL;
925 goto error_ret;
926 }
4c79dd00 927 trig->name = name;
e364185f
MR		 928
929 if (of_property_read_u32(trig_node, "trigger-value", &prop)) {
930 dev_err(&idev->dev, "Missing trigger-value property in the DT.\n");
931 ret = -EINVAL;
932 goto error_ret;
933 }
4c79dd00 934 trig->value = prop;
e364185f
MR		 935 trig->is_external = of_property_read_bool(trig_node, "trigger-external");
936 i++;
937 }
938
c8b11de0
JW		 939 /* Check if touchscreen is supported. */
940 if (st->caps->has_ts)
941 return at91_adc_probe_dt_ts(node, st, &idev->dev);
942 else
943 dev_info(&idev->dev, "not support touchscreen in the adc compatible string.\n");
944
e364185f
MR		 945 return 0;
946
947error_ret:
948 return ret;
949}
950
0e589d5f
MR		 951static int at91_adc_probe_pdata(struct at91_adc_state *st,
952 struct platform_device *pdev)
953{
954 struct at91_adc_data *pdata = pdev->dev.platform_data;
955
956 if (!pdata)
957 return -EINVAL;
958
467a44b0
AB		 959 st->caps = (struct at91_adc_caps *)
960 platform_get_device_id(pdev)->driver_data;
961
0e589d5f
MR		 962 st->use_external = pdata->use_external_triggers;
963 st->vref_mv = pdata->vref;
964 st->channels_mask = pdata->channels_used;
467a44b0 965 st->num_channels = st->caps->num_channels;
0e589d5f
MR		 966 st->startup_time = pdata->startup_time;
967 st->trigger_number = pdata->trigger_number;
968 st->trigger_list = pdata->trigger_list;
467a44b0 969 st->registers = &st->caps->registers;
84882b06 970 st->touchscreen_type = pdata->touchscreen_type;
0e589d5f
MR		 971
972 return 0;
973}
974
975static const struct iio_info at91_adc_info = {
976 .driver_module = THIS_MODULE,
977 .read_raw = &at91_adc_read_raw,
978};
979
c8b11de0
JW		 980/* Touchscreen related functions */
981static int atmel_ts_open(struct input_dev *dev)
982{
983 struct at91_adc_state *st = input_get_drvdata(dev);
984
84882b06
AB		 985 if (st->caps->has_tsmr)
986 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);
987 else
988 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);
c8b11de0
JW		 989 return 0;
990}
991
992static void atmel_ts_close(struct input_dev *dev)
993{
994 struct at91_adc_state *st = input_get_drvdata(dev);
995
84882b06
AB		 996 if (st->caps->has_tsmr)
997 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);
998 else
999 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);
c8b11de0
JW		 1000}
1001
1002static int at91_ts_hw_init(struct at91_adc_state *st, u32 adc_clk_khz)
1003{
84882b06 1004 u32 reg = 0;
c8b11de0
JW		 1005 int i = 0;
1006
c8b11de0
JW		 1007 /* a Pen Detect Debounce Time is necessary for the ADC Touch to avoid
1008 * pen detect noise.
1009 * The formula is : Pen Detect Debounce Time = (2 ^ pendbc) / ADCClock
1010 */
84882b06
AB		 1011 st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz /
1012 1000, 1);
c8b11de0 1013
84882b06 1014 while (st->ts_pendbc >> ++i)
c8b11de0 1015 ; /* Empty! Find the shift offset */
84882b06
AB		 1016 if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1))))
1017 st->ts_pendbc = i;
c8b11de0 1018 else
84882b06 1019 st->ts_pendbc = i - 1;
c8b11de0 1020
84882b06
AB		 1021 if (!st->caps->has_tsmr) {
1022 reg = at91_adc_readl(st, AT91_ADC_MR);
1023 reg |= AT91_ADC_TSAMOD_TS_ONLY_MODE | AT91_ADC_PENDET;
1024
1025 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;
1026 at91_adc_writel(st, AT91_ADC_MR, reg);
1027
1028 reg = AT91_ADC_TSR_SHTIM_(TOUCH_SHTIM) & AT91_ADC_TSR_SHTIM;
1029 at91_adc_writel(st, AT91_ADC_TSR, reg);
1030
1031 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL *
1032 adc_clk_khz / 1000) - 1, 1);
1033
1034 return 0;
c8b11de0
JW		 1035 }
1036
84882b06
AB		 1037 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)
1038 reg = AT91_ADC_TSMR_TSMODE_4WIRE_PRESS;
1039 else
1040 reg = AT91_ADC_TSMR_TSMODE_5WIRE;
1041
1042 reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average)
1043 & AT91_ADC_TSMR_TSAV;
1044 reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC;
1045 reg |= AT91_ADC_TSMR_NOTSDMA;
1046 reg |= AT91_ADC_TSMR_PENDET_ENA;
1047 reg |= 0x03 << 8; /* TSFREQ, needs to be bigger than TSAV */
1048
1049 at91_adc_writel(st, AT91_ADC_TSMR, reg);
1050
c8b11de0
JW		 1051 /* Change adc internal resistor value for better pen detection,
1052 * default value is 100 kOhm.
1053 * 0 = 200 kOhm, 1 = 150 kOhm, 2 = 100 kOhm, 3 = 50 kOhm
1054 * option only available on ES2 and higher
1055 */
1056 at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity
1057 & AT91_ADC_ACR_PENDETSENS);
1058
84882b06 1059 /* Sample Period Time = (TRGPER + 1) / ADCClock */
c8b11de0
JW		 1060 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US *
1061 adc_clk_khz / 1000) - 1, 1);
1062
1063 return 0;
1064}
1065
1066static int at91_ts_register(struct at91_adc_state *st,
1067 struct platform_device *pdev)
1068{
1069 struct input_dev *input;
1070 struct iio_dev *idev = iio_priv_to_dev(st);
1071 int ret;
1072
1073 input = input_allocate_device();
1074 if (!input) {
1075 dev_err(&idev->dev, "Failed to allocate TS device!\n");
1076 return -ENOMEM;
1077 }
1078
1079 input->name = DRIVER_NAME;
1080 input->id.bustype = BUS_HOST;
1081 input->dev.parent = &pdev->dev;
1082 input->open = atmel_ts_open;
1083 input->close = atmel_ts_close;
1084
1085 __set_bit(EV_ABS, input->evbit);
1086 __set_bit(EV_KEY, input->evbit);
1087 __set_bit(BTN_TOUCH, input->keybit);
84882b06
AB		 1088 if (st->caps->has_tsmr) {
1089 input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1,
1090 0, 0);
1091 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1,
1092 0, 0);
1093 input_set_abs_params(input, ABS_PRESSURE, 0, 0xffffff, 0, 0);
1094 } else {
1095 if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) {
1096 dev_err(&pdev->dev,
1097 "This touchscreen controller only support 4 wires\n");
1098 ret = -EINVAL;
1099 goto err;
1100 }
1101
1102 input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1,
1103 0, 0);
1104 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1,
1105 0, 0);
1106 }
c8b11de0
JW		 1107
1108 st->ts_input = input;
1109 input_set_drvdata(input, st);
1110
1111 ret = input_register_device(input);
1112 if (ret)
84882b06
AB		 1113 goto err;
1114
1115 return ret;
c8b11de0 1116
84882b06
AB		 1117err:
1118 input_free_device(st->ts_input);
c8b11de0
JW		 1119 return ret;
1120}
1121
1122static void at91_ts_unregister(struct at91_adc_state *st)
1123{
1124 input_unregister_device(st->ts_input);
1125}
1126
fc52692c 1127static int at91_adc_probe(struct platform_device *pdev)
0e589d5f 1128{
db10e201 1129 unsigned int prsc, mstrclk, ticks, adc_clk, adc_clk_khz, shtim;
0e589d5f
MR		 1130 int ret;
1131 struct iio_dev *idev;
1132 struct at91_adc_state *st;
1133 struct resource *res;
e748783c 1134 u32 reg;
0e589d5f 1135
f8837532
SK		 1136 idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state));
1137 if (!idev)
1138 return -ENOMEM;
0e589d5f
MR		 1139
1140 st = iio_priv(idev);
1141
e364185f
MR		 1142 if (pdev->dev.of_node)
1143 ret = at91_adc_probe_dt(st, pdev);
1144 else
1145 ret = at91_adc_probe_pdata(st, pdev);
1146
0e589d5f
MR		 1147 if (ret) {
1148 dev_err(&pdev->dev, "No platform data available.\n");
f8837532 1149 return -EINVAL;
0e589d5f
MR		 1150 }
1151
0e589d5f
MR		 1152 platform_set_drvdata(pdev, idev);
1153
1154 idev->dev.parent = &pdev->dev;
1155 idev->name = dev_name(&pdev->dev);
1156 idev->modes = INDIO_DIRECT_MODE;
1157 idev->info = &at91_adc_info;
1158
1159 st->irq = platform_get_irq(pdev, 0);
1160 if (st->irq < 0) {
1161 dev_err(&pdev->dev, "No IRQ ID is designated\n");
f8837532 1162 return -ENODEV;
0e589d5f
MR		 1163 }
1164
390d75c1 1165 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0e589d5f 1166
5fd98466
TR		 1167 st->reg_base = devm_ioremap_resource(&pdev->dev, res);
1168 if (IS_ERR(st->reg_base)) {
f8837532 1169 return PTR_ERR(st->reg_base);
0e589d5f
MR		 1170 }
1171
1172 /*
1173 * Disable all IRQs before setting up the handler
1174 */
1175 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST);
1176 at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF);
84882b06
AB		 1177
1178 if (st->caps->has_tsmr)
1179 ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0,
1180 pdev->dev.driver->name, idev);
1181 else
1182 ret = request_irq(st->irq, at91_adc_rl_interrupt, 0,
1183 pdev->dev.driver->name, idev);
0e589d5f
MR		 1184 if (ret) {
1185 dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
f8837532 1186 return ret;
0e589d5f
MR		 1187 }
1188
390d75c1 1189 st->clk = devm_clk_get(&pdev->dev, "adc_clk");
0e589d5f
MR		 1190 if (IS_ERR(st->clk)) {
1191 dev_err(&pdev->dev, "Failed to get the clock.\n");
1192 ret = PTR_ERR(st->clk);
1193 goto error_free_irq;
1194 }
1195
00062a9c 1196 ret = clk_prepare_enable(st->clk);
0e589d5f 1197 if (ret) {
00062a9c
JL		 1198 dev_err(&pdev->dev,
1199 "Could not prepare or enable the clock.\n");
390d75c1 1200 goto error_free_irq;
0e589d5f
MR		 1201 }
1202
390d75c1 1203 st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk");
0e589d5f
MR		 1204 if (IS_ERR(st->adc_clk)) {
1205 dev_err(&pdev->dev, "Failed to get the ADC clock.\n");
f755bbbf 1206 ret = PTR_ERR(st->adc_clk);
0e589d5f
MR		 1207 goto error_disable_clk;
1208 }
1209
00062a9c 1210 ret = clk_prepare_enable(st->adc_clk);
0e589d5f 1211 if (ret) {
00062a9c
JL		 1212 dev_err(&pdev->dev,
1213 "Could not prepare or enable the ADC clock.\n");
390d75c1 1214 goto error_disable_clk;
0e589d5f
MR		 1215 }
1216
0e589d5f
MR		 1217 /*
1218 * Prescaler rate computation using the formula from the Atmel's
1219 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being
1220 * specified by the electrical characteristics of the board.
1221 */
1222 mstrclk = clk_get_rate(st->clk);
1223 adc_clk = clk_get_rate(st->adc_clk);
db10e201 1224 adc_clk_khz = adc_clk / 1000;
c8b11de0
JW		 1225
1226 dev_dbg(&pdev->dev, "Master clock is set as: %d Hz, adc_clk should set as: %d Hz\n",
1227 mstrclk, adc_clk);
1228
0e589d5f
MR		 1229 prsc = (mstrclk / (2 * adc_clk)) - 1;
1230
1231 if (!st->startup_time) {
1232 dev_err(&pdev->dev, "No startup time available.\n");
1233 ret = -EINVAL;
1234 goto error_disable_adc_clk;
1235 }
c4601666 1236 ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz);
0e589d5f 1237
beca9e76
JCPV		 1238 /*
1239 * a minimal Sample and Hold Time is necessary for the ADC to guarantee
1240 * the best converted final value between two channels selection
1241 * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock
1242 */
8f32b6ba
AB		 1243 if (st->sample_hold_time > 0)
1244 shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000)
1245 - 1, 1);
1246 else
1247 shtim = 0;
beca9e76 1248
9120c0be
JW		 1249 reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask;
1250 reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask;
47be16b6 1251 if (st->low_res)
e748783c
JCPV		 1252 reg |= AT91_ADC_LOWRES;
1253 if (st->sleep_mode)
1254 reg |= AT91_ADC_SLEEP;
beca9e76 1255 reg |= AT91_ADC_SHTIM_(shtim) & AT91_ADC_SHTIM;
e748783c 1256 at91_adc_writel(st, AT91_ADC_MR, reg);
0e589d5f
MR		 1257
1258 /* Setup the ADC channels available on the board */
1259 ret = at91_adc_channel_init(idev);
1260 if (ret < 0) {
1261 dev_err(&pdev->dev, "Couldn't initialize the channels.\n");
1262 goto error_disable_adc_clk;
1263 }
1264
1265 init_waitqueue_head(&st->wq_data_avail);
1266 mutex_init(&st->lock);
1267
c8b11de0
JW		 1268 /*
1269 * Since touch screen will set trigger register as period trigger. So
1270 * when touch screen is enabled, then we have to disable hardware
1271 * trigger for classic adc.
1272 */
1273 if (!st->touchscreen_type) {
1274 ret = at91_adc_buffer_init(idev);
1275 if (ret < 0) {
1276 dev_err(&pdev->dev, "Couldn't initialize the buffer.\n");
1277 goto error_disable_adc_clk;
1278 }
0e589d5f 1279
c8b11de0
JW		 1280 ret = at91_adc_trigger_init(idev);
1281 if (ret < 0) {
1282 dev_err(&pdev->dev, "Couldn't setup the triggers.\n");
1283 at91_adc_buffer_remove(idev);
1284 goto error_disable_adc_clk;
1285 }
1286 } else {
c8b11de0
JW		 1287 ret = at91_ts_register(st, pdev);
1288 if (ret)
1289 goto error_disable_adc_clk;
1290
1291 at91_ts_hw_init(st, adc_clk_khz);
0e589d5f
MR		 1292 }
1293
1294 ret = iio_device_register(idev);
1295 if (ret < 0) {
1296 dev_err(&pdev->dev, "Couldn't register the device.\n");
c8b11de0 1297 goto error_iio_device_register;
0e589d5f
MR		 1298 }
1299
1300 return 0;
1301
c8b11de0
JW		 1302error_iio_device_register:
1303 if (!st->touchscreen_type) {
1304 at91_adc_trigger_remove(idev);
1305 at91_adc_buffer_remove(idev);
1306 } else {
1307 at91_ts_unregister(st);
1308 }
0e589d5f 1309error_disable_adc_clk:
00062a9c 1310 clk_disable_unprepare(st->adc_clk);
0e589d5f 1311error_disable_clk:
00062a9c 1312 clk_disable_unprepare(st->clk);
0e589d5f
MR		 1313error_free_irq:
1314 free_irq(st->irq, idev);
0e589d5f
MR		 1315 return ret;
1316}
1317
fc52692c 1318static int at91_adc_remove(struct platform_device *pdev)
0e589d5f
MR		 1319{
1320 struct iio_dev *idev = platform_get_drvdata(pdev);
0e589d5f
MR		 1321 struct at91_adc_state *st = iio_priv(idev);
1322
1323 iio_device_unregister(idev);
c8b11de0
JW		 1324 if (!st->touchscreen_type) {
1325 at91_adc_trigger_remove(idev);
1326 at91_adc_buffer_remove(idev);
1327 } else {
1328 at91_ts_unregister(st);
1329 }
0e589d5f 1330 clk_disable_unprepare(st->adc_clk);
00062a9c 1331 clk_disable_unprepare(st->clk);
0e589d5f 1332 free_irq(st->irq, idev);
0e589d5f
MR		 1333
1334 return 0;
1335}
1336
e1811f97 1337static struct at91_adc_caps at91sam9260_caps = {
c4601666 1338 .calc_startup_ticks = calc_startup_ticks_9260,
2b6d598b 1339 .num_channels = 4,
e1811f97
JW		 1340 .registers = {
1341 .channel_base = AT91_ADC_CHR(0),
1342 .drdy_mask = AT91_ADC_DRDY,
1343 .status_register = AT91_ADC_SR,
1344 .trigger_register = AT91_ADC_TRGR_9260,
9120c0be
JW		 1345 .mr_prescal_mask = AT91_ADC_PRESCAL_9260,
1346 .mr_startup_mask = AT91_ADC_STARTUP_9260,
e1811f97
JW		 1347 },
1348};
1349
65b1fdba
AB		 1350static struct at91_adc_caps at91sam9rl_caps = {
1351 .has_ts = true,
1352 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */
1353 .num_channels = 6,
1354 .registers = {
1355 .channel_base = AT91_ADC_CHR(0),
1356 .drdy_mask = AT91_ADC_DRDY,
1357 .status_register = AT91_ADC_SR,
1358 .trigger_register = AT91_ADC_TRGR_9G45,
1359 .mr_prescal_mask = AT91_ADC_PRESCAL_9260,
1360 .mr_startup_mask = AT91_ADC_STARTUP_9G45,
1361 },
1362};
1363
e1811f97 1364static struct at91_adc_caps at91sam9g45_caps = {
c8b11de0 1365 .has_ts = true,
c4601666 1366 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */
2b6d598b 1367 .num_channels = 8,
e1811f97
JW		 1368 .registers = {
1369 .channel_base = AT91_ADC_CHR(0),
1370 .drdy_mask = AT91_ADC_DRDY,
1371 .status_register = AT91_ADC_SR,
1372 .trigger_register = AT91_ADC_TRGR_9G45,
9120c0be
JW		 1373 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45,
1374 .mr_startup_mask = AT91_ADC_STARTUP_9G45,
e1811f97
JW		 1375 },
1376};
1377
1378static struct at91_adc_caps at91sam9x5_caps = {
c8b11de0
JW		 1379 .has_ts = true,
1380 .has_tsmr = true,
1381 .ts_filter_average = 3,
1382 .ts_pen_detect_sensitivity = 2,
c4601666 1383 .calc_startup_ticks = calc_startup_ticks_9x5,
2b6d598b 1384 .num_channels = 12,
e1811f97
JW		 1385 .registers = {
1386 .channel_base = AT91_ADC_CDR0_9X5,
1387 .drdy_mask = AT91_ADC_SR_DRDY_9X5,
1388 .status_register = AT91_ADC_SR_9X5,
1389 .trigger_register = AT91_ADC_TRGR_9X5,
9120c0be
JW		 1390 /* prescal mask is same as 9G45 */
1391 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45,
1392 .mr_startup_mask = AT91_ADC_STARTUP_9X5,
e1811f97
JW		 1393 },
1394};
1395
e364185f 1396static const struct of_device_id at91_adc_dt_ids[] = {
e1811f97 1397 { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps },
65b1fdba 1398 { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps },
e1811f97
JW		 1399 { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps },
1400 { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps },
e364185f
MR		 1401 {},
1402};
1403MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);
467a44b0
AB		 1404
1405static const struct platform_device_id at91_adc_ids[] = {
1406 {
1407 .name = "at91sam9260-adc",
1408 .driver_data = (unsigned long)&at91sam9260_caps,
65b1fdba
AB		 1409 }, {
1410 .name = "at91sam9rl-adc",
1411 .driver_data = (unsigned long)&at91sam9rl_caps,
467a44b0
AB		 1412 }, {
1413 .name = "at91sam9g45-adc",
1414 .driver_data = (unsigned long)&at91sam9g45_caps,
1415 }, {
1416 .name = "at91sam9x5-adc",
1417 .driver_data = (unsigned long)&at91sam9x5_caps,
1418 }, {
1419 /* terminator */
1420 }
1421};
1422MODULE_DEVICE_TABLE(platform, at91_adc_ids);
e364185f 1423
0e589d5f
MR		 1424static struct platform_driver at91_adc_driver = {
1425 .probe = at91_adc_probe,
fc52692c 1426 .remove = at91_adc_remove,
467a44b0 1427 .id_table = at91_adc_ids,
0e589d5f 1428 .driver = {
c8b11de0 1429 .name = DRIVER_NAME,
e364185f 1430 .of_match_table = of_match_ptr(at91_adc_dt_ids),
0e589d5f
MR		 1431 },
1432};
1433
1434module_platform_driver(at91_adc_driver);
1435
1436MODULE_LICENSE("GPL");
1437MODULE_DESCRIPTION("Atmel AT91 ADC Driver");
1438MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
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