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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / iio / adc / at91_adc.c
blob34b928cefeedbaff6932de3eba457930e3afd297
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>
14 #include <linux/input.h>
15 #include <linux/interrupt.h>
16 #include <linux/jiffies.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/of_device.h>
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>
30 #include <linux/iio/trigger.h>
31 #include <linux/iio/trigger_consumer.h>
32 #include <linux/iio/triggered_buffer.h>
33 #include <linux/pinctrl/consumer.h>
34
35 /* Registers */
36 #define AT91_ADC_CR 0x00 /* Control Register */
37 #define AT91_ADC_SWRST (1 << 0) /* Software Reset */
38 #define AT91_ADC_START (1 << 1) /* Start Conversion */
39
40 #define AT91_ADC_MR 0x04 /* Mode Register */
41 #define AT91_ADC_TSAMOD (3 << 0) /* ADC mode */
42 #define AT91_ADC_TSAMOD_ADC_ONLY_MODE (0 << 0) /* ADC Mode */
43 #define AT91_ADC_TSAMOD_TS_ONLY_MODE (1 << 0) /* Touch Screen Only Mode */
44 #define AT91_ADC_TRGEN (1 << 0) /* Trigger Enable */
45 #define AT91_ADC_TRGSEL (7 << 1) /* Trigger Selection */
46 #define AT91_ADC_TRGSEL_TC0 (0 << 1)
47 #define AT91_ADC_TRGSEL_TC1 (1 << 1)
48 #define AT91_ADC_TRGSEL_TC2 (2 << 1)
49 #define AT91_ADC_TRGSEL_EXTERNAL (6 << 1)
50 #define AT91_ADC_LOWRES (1 << 4) /* Low Resolution */
51 #define AT91_ADC_SLEEP (1 << 5) /* Sleep Mode */
52 #define AT91_ADC_PENDET (1 << 6) /* Pen contact detection enable */
53 #define AT91_ADC_PRESCAL_9260 (0x3f << 8) /* Prescalar Rate Selection */
54 #define AT91_ADC_PRESCAL_9G45 (0xff << 8)
55 #define AT91_ADC_PRESCAL_(x) ((x) << 8)
56 #define AT91_ADC_STARTUP_9260 (0x1f << 16) /* Startup Up Time */
57 #define AT91_ADC_STARTUP_9G45 (0x7f << 16)
58 #define AT91_ADC_STARTUP_9X5 (0xf << 16)
59 #define AT91_ADC_STARTUP_(x) ((x) << 16)
60 #define AT91_ADC_SHTIM (0xf << 24) /* Sample & Hold Time */
61 #define AT91_ADC_SHTIM_(x) ((x) << 24)
62 #define AT91_ADC_PENDBC (0x0f << 28) /* Pen Debounce time */
63 #define AT91_ADC_PENDBC_(x) ((x) << 28)
64
65 #define AT91_ADC_TSR 0x0C
66 #define AT91_ADC_TSR_SHTIM (0xf << 24) /* Sample & Hold Time */
67 #define AT91_ADC_TSR_SHTIM_(x) ((x) << 24)
68
69 #define AT91_ADC_CHER 0x10 /* Channel Enable Register */
70 #define AT91_ADC_CHDR 0x14 /* Channel Disable Register */
71 #define AT91_ADC_CHSR 0x18 /* Channel Status Register */
72 #define AT91_ADC_CH(n) (1 << (n)) /* Channel Number */
73
74 #define AT91_ADC_SR 0x1C /* Status Register */
75 #define AT91_ADC_EOC(n) (1 << (n)) /* End of Conversion on Channel N */
76 #define AT91_ADC_OVRE(n) (1 << ((n) + 8))/* Overrun Error on Channel N */
77 #define AT91_ADC_DRDY (1 << 16) /* Data Ready */
78 #define AT91_ADC_GOVRE (1 << 17) /* General Overrun Error */
79 #define AT91_ADC_ENDRX (1 << 18) /* End of RX Buffer */
80 #define AT91_ADC_RXFUFF (1 << 19) /* RX Buffer Full */
81
82 #define AT91_ADC_SR_9X5 0x30 /* Status Register for 9x5 */
83 #define AT91_ADC_SR_DRDY_9X5 (1 << 24) /* Data Ready */
84
85 #define AT91_ADC_LCDR 0x20 /* Last Converted Data Register */
86 #define AT91_ADC_LDATA (0x3ff)
87
88 #define AT91_ADC_IER 0x24 /* Interrupt Enable Register */
89 #define AT91_ADC_IDR 0x28 /* Interrupt Disable Register */
90 #define AT91_ADC_IMR 0x2C /* Interrupt Mask Register */
91 #define AT91RL_ADC_IER_PEN (1 << 20)
92 #define AT91RL_ADC_IER_NOPEN (1 << 21)
93 #define AT91_ADC_IER_PEN (1 << 29)
94 #define AT91_ADC_IER_NOPEN (1 << 30)
95 #define AT91_ADC_IER_XRDY (1 << 20)
96 #define AT91_ADC_IER_YRDY (1 << 21)
97 #define AT91_ADC_IER_PRDY (1 << 22)
98 #define AT91_ADC_ISR_PENS (1 << 31)
99
100 #define AT91_ADC_CHR(n) (0x30 + ((n) * 4)) /* Channel Data Register N */
101 #define AT91_ADC_DATA (0x3ff)
102
103 #define AT91_ADC_CDR0_9X5 (0x50) /* Channel Data Register 0 for 9X5 */
104
105 #define AT91_ADC_ACR 0x94 /* Analog Control Register */
106 #define AT91_ADC_ACR_PENDETSENS (0x3 << 0) /* pull-up resistor */
107
108 #define AT91_ADC_TSMR 0xB0
109 #define AT91_ADC_TSMR_TSMODE (3 << 0) /* Touch Screen Mode */
110 #define AT91_ADC_TSMR_TSMODE_NONE (0 << 0)
111 #define AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS (1 << 0)
112 #define AT91_ADC_TSMR_TSMODE_4WIRE_PRESS (2 << 0)
113 #define AT91_ADC_TSMR_TSMODE_5WIRE (3 << 0)
114 #define AT91_ADC_TSMR_TSAV (3 << 4) /* Averages samples */
115 #define AT91_ADC_TSMR_TSAV_(x) ((x) << 4)
116 #define AT91_ADC_TSMR_SCTIM (0x0f << 16) /* Switch closure time */
117 #define AT91_ADC_TSMR_SCTIM_(x) ((x) << 16)
118 #define AT91_ADC_TSMR_PENDBC (0x0f << 28) /* Pen Debounce time */
119 #define AT91_ADC_TSMR_PENDBC_(x) ((x) << 28)
120 #define AT91_ADC_TSMR_NOTSDMA (1 << 22) /* No Touchscreen DMA */
121 #define AT91_ADC_TSMR_PENDET_DIS (0 << 24) /* Pen contact detection disable */
122 #define AT91_ADC_TSMR_PENDET_ENA (1 << 24) /* Pen contact detection enable */
123
124 #define AT91_ADC_TSXPOSR 0xB4
125 #define AT91_ADC_TSYPOSR 0xB8
126 #define AT91_ADC_TSPRESSR 0xBC
127
128 #define AT91_ADC_TRGR_9260 AT91_ADC_MR
129 #define AT91_ADC_TRGR_9G45 0x08
130 #define AT91_ADC_TRGR_9X5 0xC0
131
132 /* Trigger Register bit field */
133 #define AT91_ADC_TRGR_TRGPER (0xffff << 16)
134 #define AT91_ADC_TRGR_TRGPER_(x) ((x) << 16)
135 #define AT91_ADC_TRGR_TRGMOD (0x7 << 0)
136 #define AT91_ADC_TRGR_NONE (0 << 0)
137 #define AT91_ADC_TRGR_MOD_PERIOD_TRIG (5 << 0)
138
139 #define AT91_ADC_CHAN(st, ch) \
140 (st->registers->channel_base + (ch * 4))
141 #define at91_adc_readl(st, reg) \
142 (readl_relaxed(st->reg_base + reg))
143 #define at91_adc_writel(st, reg, val) \
144 (writel_relaxed(val, st->reg_base + reg))
145
146 #define DRIVER_NAME "at91_adc"
147 #define MAX_POS_BITS 12
148
149 #define TOUCH_SAMPLE_PERIOD_US 2000 /* 2ms */
150 #define TOUCH_PEN_DETECT_DEBOUNCE_US 200
151
152 #define MAX_RLPOS_BITS 10
153 #define TOUCH_SAMPLE_PERIOD_US_RL 10000 /* 10ms, the SoC can't keep up with 2ms */
154 #define TOUCH_SHTIM 0xa
155 #define TOUCH_SCTIM_US 10 /* 10us for the Touchscreen Switches Closure Time */
156
157 /**
158 * struct at91_adc_reg_desc - Various informations relative to registers
159 * @channel_base: Base offset for the channel data registers
160 * @drdy_mask: Mask of the DRDY field in the relevant registers
161 (Interruptions registers mostly)
162 * @status_register: Offset of the Interrupt Status Register
163 * @trigger_register: Offset of the Trigger setup register
164 * @mr_prescal_mask: Mask of the PRESCAL field in the adc MR register
165 * @mr_startup_mask: Mask of the STARTUP field in the adc MR register
166 */
167 struct at91_adc_reg_desc {
168 u8 channel_base;
169 u32 drdy_mask;
170 u8 status_register;
171 u8 trigger_register;
172 u32 mr_prescal_mask;
173 u32 mr_startup_mask;
174 };
175
176 struct at91_adc_caps {
177 bool has_ts; /* Support touch screen */
178 bool has_tsmr; /* only at91sam9x5, sama5d3 have TSMR reg */
179 /*
180 * Numbers of sampling data will be averaged. Can be 0~3.
181 * Hardware can average (2 ^ ts_filter_average) sample data.
182 */
183 u8 ts_filter_average;
184 /* Pen Detection input pull-up resistor, can be 0~3 */
185 u8 ts_pen_detect_sensitivity;
186
187 /* startup time calculate function */
188 u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz);
189
190 u8 num_channels;
191 struct at91_adc_reg_desc registers;
192 };
193
194 struct at91_adc_state {
195 struct clk *adc_clk;
196 u16 *buffer;
197 unsigned long channels_mask;
198 struct clk *clk;
199 bool done;
200 int irq;
201 u16 last_value;
202 int chnb;
203 struct mutex lock;
204 u8 num_channels;
205 void __iomem *reg_base;
206 struct at91_adc_reg_desc *registers;
207 u32 startup_time;
208 u8 sample_hold_time;
209 bool sleep_mode;
210 struct iio_trigger **trig;
211 struct at91_adc_trigger *trigger_list;
212 u32 trigger_number;
213 bool use_external;
214 u32 vref_mv;
215 u32 res; /* resolution used for convertions */
216 bool low_res; /* the resolution corresponds to the lowest one */
217 wait_queue_head_t wq_data_avail;
218 struct at91_adc_caps *caps;
219
220 /*
221 * Following ADC channels are shared by touchscreen:
222 *
223 * CH0 -- Touch screen XP/UL
224 * CH1 -- Touch screen XM/UR
225 * CH2 -- Touch screen YP/LL
226 * CH3 -- Touch screen YM/Sense
227 * CH4 -- Touch screen LR(5-wire only)
228 *
229 * The bitfields below represents the reserved channel in the
230 * touchscreen mode.
231 */
232 #define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 0)
233 #define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 0)
234 enum atmel_adc_ts_type touchscreen_type;
235 struct input_dev *ts_input;
236
237 u16 ts_sample_period_val;
238 u32 ts_pressure_threshold;
239 u16 ts_pendbc;
240
241 bool ts_bufferedmeasure;
242 u32 ts_prev_absx;
243 u32 ts_prev_absy;
244 };
245
246 static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
247 {
248 struct iio_poll_func *pf = p;
249 struct iio_dev *idev = pf->indio_dev;
250 struct at91_adc_state *st = iio_priv(idev);
251 int i, j = 0;
252
253 for (i = 0; i < idev->masklength; i++) {
254 if (!test_bit(i, idev->active_scan_mask))
255 continue;
256 st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, i));
257 j++;
258 }
259
260 iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp);
261
262 iio_trigger_notify_done(idev->trig);
263
264 /* Needed to ACK the DRDY interruption */
265 at91_adc_readl(st, AT91_ADC_LCDR);
266
267 enable_irq(st->irq);
268
269 return IRQ_HANDLED;
270 }
271
272 /* Handler for classic adc channel eoc trigger */
273 static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev)
274 {
275 struct at91_adc_state *st = iio_priv(idev);
276
277 if (iio_buffer_enabled(idev)) {
278 disable_irq_nosync(irq);
279 iio_trigger_poll(idev->trig);
280 } else {
281 st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb));
282 st->done = true;
283 wake_up_interruptible(&st->wq_data_avail);
284 }
285 }
286
287 static int at91_ts_sample(struct at91_adc_state *st)
288 {
289 unsigned int xscale, yscale, reg, z1, z2;
290 unsigned int x, y, pres, xpos, ypos;
291 unsigned int rxp = 1;
292 unsigned int factor = 1000;
293 struct iio_dev *idev = iio_priv_to_dev(st);
294
295 unsigned int xyz_mask_bits = st->res;
296 unsigned int xyz_mask = (1 << xyz_mask_bits) - 1;
297
298 /* calculate position */
299 /* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */
300 reg = at91_adc_readl(st, AT91_ADC_TSXPOSR);
301 xpos = reg & xyz_mask;
302 x = (xpos << MAX_POS_BITS) - xpos;
303 xscale = (reg >> 16) & xyz_mask;
304 if (xscale == 0) {
305 dev_err(&idev->dev, "Error: xscale == 0!\n");
306 return -1;
307 }
308 x /= xscale;
309
310 /* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */
311 reg = at91_adc_readl(st, AT91_ADC_TSYPOSR);
312 ypos = reg & xyz_mask;
313 y = (ypos << MAX_POS_BITS) - ypos;
314 yscale = (reg >> 16) & xyz_mask;
315 if (yscale == 0) {
316 dev_err(&idev->dev, "Error: yscale == 0!\n");
317 return -1;
318 }
319 y /= yscale;
320
321 /* calculate the pressure */
322 reg = at91_adc_readl(st, AT91_ADC_TSPRESSR);
323 z1 = reg & xyz_mask;
324 z2 = (reg >> 16) & xyz_mask;
325
326 if (z1 != 0)
327 pres = rxp * (x * factor / 1024) * (z2 * factor / z1 - factor)
328 / factor;
329 else
330 pres = st->ts_pressure_threshold; /* no pen contacted */
331
332 dev_dbg(&idev->dev, "xpos = %d, xscale = %d, ypos = %d, yscale = %d, z1 = %d, z2 = %d, press = %d\n",
333 xpos, xscale, ypos, yscale, z1, z2, pres);
334
335 if (pres < st->ts_pressure_threshold) {
336 dev_dbg(&idev->dev, "x = %d, y = %d, pressure = %d\n",
337 x, y, pres / factor);
338 input_report_abs(st->ts_input, ABS_X, x);
339 input_report_abs(st->ts_input, ABS_Y, y);
340 input_report_abs(st->ts_input, ABS_PRESSURE, pres);
341 input_report_key(st->ts_input, BTN_TOUCH, 1);
342 input_sync(st->ts_input);
343 } else {
344 dev_dbg(&idev->dev, "pressure too low: not reporting\n");
345 }
346
347 return 0;
348 }
349
350 static irqreturn_t at91_adc_rl_interrupt(int irq, void *private)
351 {
352 struct iio_dev *idev = private;
353 struct at91_adc_state *st = iio_priv(idev);
354 u32 status = at91_adc_readl(st, st->registers->status_register);
355 unsigned int reg;
356
357 status &= at91_adc_readl(st, AT91_ADC_IMR);
358 if (status & GENMASK(st->num_channels - 1, 0))
359 handle_adc_eoc_trigger(irq, idev);
360
361 if (status & AT91RL_ADC_IER_PEN) {
362 /* Disabling pen debounce is required to get a NOPEN irq */
363 reg = at91_adc_readl(st, AT91_ADC_MR);
364 reg &= ~AT91_ADC_PENDBC;
365 at91_adc_writel(st, AT91_ADC_MR, reg);
366
367 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);
368 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_NOPEN
369 | AT91_ADC_EOC(3));
370 /* Set up period trigger for sampling */
371 at91_adc_writel(st, st->registers->trigger_register,
372 AT91_ADC_TRGR_MOD_PERIOD_TRIG |
373 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));
374 } else if (status & AT91RL_ADC_IER_NOPEN) {
375 reg = at91_adc_readl(st, AT91_ADC_MR);
376 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;
377 at91_adc_writel(st, AT91_ADC_MR, reg);
378 at91_adc_writel(st, st->registers->trigger_register,
379 AT91_ADC_TRGR_NONE);
380
381 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_NOPEN
382 | AT91_ADC_EOC(3));
383 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);
384 st->ts_bufferedmeasure = false;
385 input_report_key(st->ts_input, BTN_TOUCH, 0);
386 input_sync(st->ts_input);
387 } else if (status & AT91_ADC_EOC(3) && st->ts_input) {
388 /* Conversion finished and we've a touchscreen */
389 if (st->ts_bufferedmeasure) {
390 /*
391 * Last measurement is always discarded, since it can
392 * be erroneous.
393 * Always report previous measurement
394 */
395 input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx);
396 input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy);
397 input_report_key(st->ts_input, BTN_TOUCH, 1);
398 input_sync(st->ts_input);
399 } else
400 st->ts_bufferedmeasure = true;
401
402 /* Now make new measurement */
403 st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3))
404 << MAX_RLPOS_BITS;
405 st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2));
406
407 st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1))
408 << MAX_RLPOS_BITS;
409 st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0));
410 }
411
412 return IRQ_HANDLED;
413 }
414
415 static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private)
416 {
417 struct iio_dev *idev = private;
418 struct at91_adc_state *st = iio_priv(idev);
419 u32 status = at91_adc_readl(st, st->registers->status_register);
420 const uint32_t ts_data_irq_mask =
421 AT91_ADC_IER_XRDY |
422 AT91_ADC_IER_YRDY |
423 AT91_ADC_IER_PRDY;
424
425 if (status & GENMASK(st->num_channels - 1, 0))
426 handle_adc_eoc_trigger(irq, idev);
427
428 if (status & AT91_ADC_IER_PEN) {
429 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);
430 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_NOPEN |
431 ts_data_irq_mask);
432 /* Set up period trigger for sampling */
433 at91_adc_writel(st, st->registers->trigger_register,
434 AT91_ADC_TRGR_MOD_PERIOD_TRIG |
435 AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val));
436 } else if (status & AT91_ADC_IER_NOPEN) {
437 at91_adc_writel(st, st->registers->trigger_register, 0);
438 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_NOPEN |
439 ts_data_irq_mask);
440 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);
441
442 input_report_key(st->ts_input, BTN_TOUCH, 0);
443 input_sync(st->ts_input);
444 } else if ((status & ts_data_irq_mask) == ts_data_irq_mask) {
445 /* Now all touchscreen data is ready */
446
447 if (status & AT91_ADC_ISR_PENS) {
448 /* validate data by pen contact */
449 at91_ts_sample(st);
450 } else {
451 /* triggered by event that is no pen contact, just read
452 * them to clean the interrupt and discard all.
453 */
454 at91_adc_readl(st, AT91_ADC_TSXPOSR);
455 at91_adc_readl(st, AT91_ADC_TSYPOSR);
456 at91_adc_readl(st, AT91_ADC_TSPRESSR);
457 }
458 }
459
460 return IRQ_HANDLED;
461 }
462
463 static int at91_adc_channel_init(struct iio_dev *idev)
464 {
465 struct at91_adc_state *st = iio_priv(idev);
466 struct iio_chan_spec *chan_array, *timestamp;
467 int bit, idx = 0;
468 unsigned long rsvd_mask = 0;
469
470 /* If touchscreen is enable, then reserve the adc channels */
471 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)
472 rsvd_mask = CHAN_MASK_TOUCHSCREEN_4WIRE;
473 else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE)
474 rsvd_mask = CHAN_MASK_TOUCHSCREEN_5WIRE;
475
476 /* set up the channel mask to reserve touchscreen channels */
477 st->channels_mask &= ~rsvd_mask;
478
479 idev->num_channels = bitmap_weight(&st->channels_mask,
480 st->num_channels) + 1;
481
482 chan_array = devm_kzalloc(&idev->dev,
483 ((idev->num_channels + 1) *
484 sizeof(struct iio_chan_spec)),
485 GFP_KERNEL);
486
487 if (!chan_array)
488 return -ENOMEM;
489
490 for_each_set_bit(bit, &st->channels_mask, st->num_channels) {
491 struct iio_chan_spec *chan = chan_array + idx;
492
493 chan->type = IIO_VOLTAGE;
494 chan->indexed = 1;
495 chan->channel = bit;
496 chan->scan_index = idx;
497 chan->scan_type.sign = 'u';
498 chan->scan_type.realbits = st->res;
499 chan->scan_type.storagebits = 16;
500 chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
501 chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
502 idx++;
503 }
504 timestamp = chan_array + idx;
505
506 timestamp->type = IIO_TIMESTAMP;
507 timestamp->channel = -1;
508 timestamp->scan_index = idx;
509 timestamp->scan_type.sign = 's';
510 timestamp->scan_type.realbits = 64;
511 timestamp->scan_type.storagebits = 64;
512
513 idev->channels = chan_array;
514 return idev->num_channels;
515 }
516
517 static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
518 struct at91_adc_trigger *triggers,
519 const char *trigger_name)
520 {
521 struct at91_adc_state *st = iio_priv(idev);
522 int i;
523
524 for (i = 0; i < st->trigger_number; i++) {
525 char *name = kasprintf(GFP_KERNEL,
526 "%s-dev%d-%s",
527 idev->name,
528 idev->id,
529 triggers[i].name);
530 if (!name)
531 return -ENOMEM;
532
533 if (strcmp(trigger_name, name) == 0) {
534 kfree(name);
535 if (triggers[i].value == 0)
536 return -EINVAL;
537 return triggers[i].value;
538 }
539
540 kfree(name);
541 }
542
543 return -EINVAL;
544 }
545
546 static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
547 {
548 struct iio_dev *idev = iio_trigger_get_drvdata(trig);
549 struct at91_adc_state *st = iio_priv(idev);
550 struct at91_adc_reg_desc *reg = st->registers;
551 u32 status = at91_adc_readl(st, reg->trigger_register);
552 int value;
553 u8 bit;
554
555 value = at91_adc_get_trigger_value_by_name(idev,
556 st->trigger_list,
557 idev->trig->name);
558 if (value < 0)
559 return value;
560
561 if (state) {
562 st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL);
563 if (st->buffer == NULL)
564 return -ENOMEM;
565
566 at91_adc_writel(st, reg->trigger_register,
567 status | value);
568
569 for_each_set_bit(bit, idev->active_scan_mask,
570 st->num_channels) {
571 struct iio_chan_spec const *chan = idev->channels + bit;
572 at91_adc_writel(st, AT91_ADC_CHER,
573 AT91_ADC_CH(chan->channel));
574 }
575
576 at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask);
577
578 } else {
579 at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask);
580
581 at91_adc_writel(st, reg->trigger_register,
582 status & ~value);
583
584 for_each_set_bit(bit, idev->active_scan_mask,
585 st->num_channels) {
586 struct iio_chan_spec const *chan = idev->channels + bit;
587 at91_adc_writel(st, AT91_ADC_CHDR,
588 AT91_ADC_CH(chan->channel));
589 }
590 kfree(st->buffer);
591 }
592
593 return 0;
594 }
595
596 static const struct iio_trigger_ops at91_adc_trigger_ops = {
597 .owner = THIS_MODULE,
598 .set_trigger_state = &at91_adc_configure_trigger,
599 };
600
601 static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev,
602 struct at91_adc_trigger *trigger)
603 {
604 struct iio_trigger *trig;
605 int ret;
606
607 trig = iio_trigger_alloc("%s-dev%d-%s", idev->name,
608 idev->id, trigger->name);
609 if (trig == NULL)
610 return NULL;
611
612 trig->dev.parent = idev->dev.parent;
613 iio_trigger_set_drvdata(trig, idev);
614 trig->ops = &at91_adc_trigger_ops;
615
616 ret = iio_trigger_register(trig);
617 if (ret)
618 return NULL;
619
620 return trig;
621 }
622
623 static int at91_adc_trigger_init(struct iio_dev *idev)
624 {
625 struct at91_adc_state *st = iio_priv(idev);
626 int i, ret;
627
628 st->trig = devm_kzalloc(&idev->dev,
629 st->trigger_number * sizeof(*st->trig),
630 GFP_KERNEL);
631
632 if (st->trig == NULL) {
633 ret = -ENOMEM;
634 goto error_ret;
635 }
636
637 for (i = 0; i < st->trigger_number; i++) {
638 if (st->trigger_list[i].is_external && !(st->use_external))
639 continue;
640
641 st->trig[i] = at91_adc_allocate_trigger(idev,
642 st->trigger_list + i);
643 if (st->trig[i] == NULL) {
644 dev_err(&idev->dev,
645 "Could not allocate trigger %d\n", i);
646 ret = -ENOMEM;
647 goto error_trigger;
648 }
649 }
650
651 return 0;
652
653 error_trigger:
654 for (i--; i >= 0; i--) {
655 iio_trigger_unregister(st->trig[i]);
656 iio_trigger_free(st->trig[i]);
657 }
658 error_ret:
659 return ret;
660 }
661
662 static void at91_adc_trigger_remove(struct iio_dev *idev)
663 {
664 struct at91_adc_state *st = iio_priv(idev);
665 int i;
666
667 for (i = 0; i < st->trigger_number; i++) {
668 iio_trigger_unregister(st->trig[i]);
669 iio_trigger_free(st->trig[i]);
670 }
671 }
672
673 static int at91_adc_buffer_init(struct iio_dev *idev)
674 {
675 return iio_triggered_buffer_setup(idev, &iio_pollfunc_store_time,
676 &at91_adc_trigger_handler, NULL);
677 }
678
679 static void at91_adc_buffer_remove(struct iio_dev *idev)
680 {
681 iio_triggered_buffer_cleanup(idev);
682 }
683
684 static int at91_adc_read_raw(struct iio_dev *idev,
685 struct iio_chan_spec const *chan,
686 int *val, int *val2, long mask)
687 {
688 struct at91_adc_state *st = iio_priv(idev);
689 int ret;
690
691 switch (mask) {
692 case IIO_CHAN_INFO_RAW:
693 mutex_lock(&st->lock);
694
695 st->chnb = chan->channel;
696 at91_adc_writel(st, AT91_ADC_CHER,
697 AT91_ADC_CH(chan->channel));
698 at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel));
699 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START);
700
701 ret = wait_event_interruptible_timeout(st->wq_data_avail,
702 st->done,
703 msecs_to_jiffies(1000));
704 if (ret == 0)
705 ret = -ETIMEDOUT;
706 if (ret < 0) {
707 mutex_unlock(&st->lock);
708 return ret;
709 }
710
711 *val = st->last_value;
712
713 at91_adc_writel(st, AT91_ADC_CHDR,
714 AT91_ADC_CH(chan->channel));
715 at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel));
716
717 st->last_value = 0;
718 st->done = false;
719 mutex_unlock(&st->lock);
720 return IIO_VAL_INT;
721
722 case IIO_CHAN_INFO_SCALE:
723 *val = st->vref_mv;
724 *val2 = chan->scan_type.realbits;
725 return IIO_VAL_FRACTIONAL_LOG2;
726 default:
727 break;
728 }
729 return -EINVAL;
730 }
731
732 static int at91_adc_of_get_resolution(struct at91_adc_state *st,
733 struct platform_device *pdev)
734 {
735 struct iio_dev *idev = iio_priv_to_dev(st);
736 struct device_node *np = pdev->dev.of_node;
737 int count, i, ret = 0;
738 char *res_name, *s;
739 u32 *resolutions;
740
741 count = of_property_count_strings(np, "atmel,adc-res-names");
742 if (count < 2) {
743 dev_err(&idev->dev, "You must specified at least two resolution names for "
744 "adc-res-names property in the DT\n");
745 return count;
746 }
747
748 resolutions = kmalloc_array(count, sizeof(*resolutions), GFP_KERNEL);
749 if (!resolutions)
750 return -ENOMEM;
751
752 if (of_property_read_u32_array(np, "atmel,adc-res", resolutions, count)) {
753 dev_err(&idev->dev, "Missing adc-res property in the DT.\n");
754 ret = -ENODEV;
755 goto ret;
756 }
757
758 if (of_property_read_string(np, "atmel,adc-use-res", (const char **)&res_name))
759 res_name = "highres";
760
761 for (i = 0; i < count; i++) {
762 if (of_property_read_string_index(np, "atmel,adc-res-names", i, (const char **)&s))
763 continue;
764
765 if (strcmp(res_name, s))
766 continue;
767
768 st->res = resolutions[i];
769 if (!strcmp(res_name, "lowres"))
770 st->low_res = true;
771 else
772 st->low_res = false;
773
774 dev_info(&idev->dev, "Resolution used: %u bits\n", st->res);
775 goto ret;
776 }
777
778 dev_err(&idev->dev, "There is no resolution for %s\n", res_name);
779
780 ret:
781 kfree(resolutions);
782 return ret;
783 }
784
785 static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz)
786 {
787 /*
788 * Number of ticks needed to cover the startup time of the ADC
789 * as defined in the electrical characteristics of the board,
790 * divided by 8. The formula thus is :
791 * Startup Time = (ticks + 1) * 8 / ADC Clock
792 */
793 return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8;
794 }
795
796 static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz)
797 {
798 /*
799 * For sama5d3x and at91sam9x5, the formula changes to:
800 * Startup Time = <lookup_table_value> / ADC Clock
801 */
802 const int startup_lookup[] = {
803 0, 8, 16, 24,
804 64, 80, 96, 112,
805 512, 576, 640, 704,
806 768, 832, 896, 960
807 };
808 int i, size = ARRAY_SIZE(startup_lookup);
809 unsigned int ticks;
810
811 ticks = startup_time * adc_clk_khz / 1000;
812 for (i = 0; i < size; i++)
813 if (ticks < startup_lookup[i])
814 break;
815
816 ticks = i;
817 if (ticks == size)
818 /* Reach the end of lookup table */
819 ticks = size - 1;
820
821 return ticks;
822 }
823
824 static const struct of_device_id at91_adc_dt_ids[];
825
826 static int at91_adc_probe_dt_ts(struct device_node *node,
827 struct at91_adc_state *st, struct device *dev)
828 {
829 int ret;
830 u32 prop;
831
832 ret = of_property_read_u32(node, "atmel,adc-ts-wires", &prop);
833 if (ret) {
834 dev_info(dev, "ADC Touch screen is disabled.\n");
835 return 0;
836 }
837
838 switch (prop) {
839 case 4:
840 case 5:
841 st->touchscreen_type = prop;
842 break;
843 default:
844 dev_err(dev, "Unsupported number of touchscreen wires (%d). Should be 4 or 5.\n", prop);
845 return -EINVAL;
846 }
847
848 if (!st->caps->has_tsmr)
849 return 0;
850 prop = 0;
851 of_property_read_u32(node, "atmel,adc-ts-pressure-threshold", &prop);
852 st->ts_pressure_threshold = prop;
853 if (st->ts_pressure_threshold) {
854 return 0;
855 } else {
856 dev_err(dev, "Invalid pressure threshold for the touchscreen\n");
857 return -EINVAL;
858 }
859 }
860
861 static int at91_adc_probe_dt(struct at91_adc_state *st,
862 struct platform_device *pdev)
863 {
864 struct iio_dev *idev = iio_priv_to_dev(st);
865 struct device_node *node = pdev->dev.of_node;
866 struct device_node *trig_node;
867 int i = 0, ret;
868 u32 prop;
869
870 if (!node)
871 return -EINVAL;
872
873 st->caps = (struct at91_adc_caps *)
874 of_match_device(at91_adc_dt_ids, &pdev->dev)->data;
875
876 st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
877
878 if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {
879 dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n");
880 ret = -EINVAL;
881 goto error_ret;
882 }
883 st->channels_mask = prop;
884
885 st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode");
886
887 if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
888 dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");
889 ret = -EINVAL;
890 goto error_ret;
891 }
892 st->startup_time = prop;
893
894 prop = 0;
895 of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop);
896 st->sample_hold_time = prop;
897
898 if (of_property_read_u32(node, "atmel,adc-vref", &prop)) {
899 dev_err(&idev->dev, "Missing adc-vref property in the DT.\n");
900 ret = -EINVAL;
901 goto error_ret;
902 }
903 st->vref_mv = prop;
904
905 ret = at91_adc_of_get_resolution(st, pdev);
906 if (ret)
907 goto error_ret;
908
909 st->registers = &st->caps->registers;
910 st->num_channels = st->caps->num_channels;
911 st->trigger_number = of_get_child_count(node);
912 st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
913 sizeof(struct at91_adc_trigger),
914 GFP_KERNEL);
915 if (!st->trigger_list) {
916 dev_err(&idev->dev, "Could not allocate trigger list memory.\n");
917 ret = -ENOMEM;
918 goto error_ret;
919 }
920
921 for_each_child_of_node(node, trig_node) {
922 struct at91_adc_trigger *trig = st->trigger_list + i;
923 const char *name;
924
925 if (of_property_read_string(trig_node, "trigger-name", &name)) {
926 dev_err(&idev->dev, "Missing trigger-name property in the DT.\n");
927 ret = -EINVAL;
928 goto error_ret;
929 }
930 trig->name = name;
931
932 if (of_property_read_u32(trig_node, "trigger-value", &prop)) {
933 dev_err(&idev->dev, "Missing trigger-value property in the DT.\n");
934 ret = -EINVAL;
935 goto error_ret;
936 }
937 trig->value = prop;
938 trig->is_external = of_property_read_bool(trig_node, "trigger-external");
939 i++;
940 }
941
942 /* Check if touchscreen is supported. */
943 if (st->caps->has_ts)
944 return at91_adc_probe_dt_ts(node, st, &idev->dev);
945 else
946 dev_info(&idev->dev, "not support touchscreen in the adc compatible string.\n");
947
948 return 0;
949
950 error_ret:
951 return ret;
952 }
953
954 static int at91_adc_probe_pdata(struct at91_adc_state *st,
955 struct platform_device *pdev)
956 {
957 struct at91_adc_data *pdata = pdev->dev.platform_data;
958
959 if (!pdata)
960 return -EINVAL;
961
962 st->caps = (struct at91_adc_caps *)
963 platform_get_device_id(pdev)->driver_data;
964
965 st->use_external = pdata->use_external_triggers;
966 st->vref_mv = pdata->vref;
967 st->channels_mask = pdata->channels_used;
968 st->num_channels = st->caps->num_channels;
969 st->startup_time = pdata->startup_time;
970 st->trigger_number = pdata->trigger_number;
971 st->trigger_list = pdata->trigger_list;
972 st->registers = &st->caps->registers;
973 st->touchscreen_type = pdata->touchscreen_type;
974
975 return 0;
976 }
977
978 static const struct iio_info at91_adc_info = {
979 .driver_module = THIS_MODULE,
980 .read_raw = &at91_adc_read_raw,
981 };
982
983 /* Touchscreen related functions */
984 static int atmel_ts_open(struct input_dev *dev)
985 {
986 struct at91_adc_state *st = input_get_drvdata(dev);
987
988 if (st->caps->has_tsmr)
989 at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN);
990 else
991 at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN);
992 return 0;
993 }
994
995 static void atmel_ts_close(struct input_dev *dev)
996 {
997 struct at91_adc_state *st = input_get_drvdata(dev);
998
999 if (st->caps->has_tsmr)
1000 at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN);
1001 else
1002 at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN);
1003 }
1004
1005 static int at91_ts_hw_init(struct at91_adc_state *st, u32 adc_clk_khz)
1006 {
1007 struct iio_dev *idev = iio_priv_to_dev(st);
1008 u32 reg = 0;
1009 u32 tssctim = 0;
1010 int i = 0;
1011
1012 /* a Pen Detect Debounce Time is necessary for the ADC Touch to avoid
1013 * pen detect noise.
1014 * The formula is : Pen Detect Debounce Time = (2 ^ pendbc) / ADCClock
1015 */
1016 st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz /
1017 1000, 1);
1018
1019 while (st->ts_pendbc >> ++i)
1020 ; /* Empty! Find the shift offset */
1021 if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1))))
1022 st->ts_pendbc = i;
1023 else
1024 st->ts_pendbc = i - 1;
1025
1026 if (!st->caps->has_tsmr) {
1027 reg = at91_adc_readl(st, AT91_ADC_MR);
1028 reg |= AT91_ADC_TSAMOD_TS_ONLY_MODE | AT91_ADC_PENDET;
1029
1030 reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC;
1031 at91_adc_writel(st, AT91_ADC_MR, reg);
1032
1033 reg = AT91_ADC_TSR_SHTIM_(TOUCH_SHTIM) & AT91_ADC_TSR_SHTIM;
1034 at91_adc_writel(st, AT91_ADC_TSR, reg);
1035
1036 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL *
1037 adc_clk_khz / 1000) - 1, 1);
1038
1039 return 0;
1040 }
1041
1042 /* Touchscreen Switches Closure time needed for allowing the value to
1043 * stabilize.
1044 * Switch Closure Time = (TSSCTIM * 4) ADCClock periods
1045 */
1046 tssctim = DIV_ROUND_UP(TOUCH_SCTIM_US * adc_clk_khz / 1000, 4);
1047 dev_dbg(&idev->dev, "adc_clk at: %d KHz, tssctim at: %d\n",
1048 adc_clk_khz, tssctim);
1049
1050 if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE)
1051 reg = AT91_ADC_TSMR_TSMODE_4WIRE_PRESS;
1052 else
1053 reg = AT91_ADC_TSMR_TSMODE_5WIRE;
1054
1055 reg |= AT91_ADC_TSMR_SCTIM_(tssctim) & AT91_ADC_TSMR_SCTIM;
1056 reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average)
1057 & AT91_ADC_TSMR_TSAV;
1058 reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC;
1059 reg |= AT91_ADC_TSMR_NOTSDMA;
1060 reg |= AT91_ADC_TSMR_PENDET_ENA;
1061 reg |= 0x03 << 8; /* TSFREQ, needs to be bigger than TSAV */
1062
1063 at91_adc_writel(st, AT91_ADC_TSMR, reg);
1064
1065 /* Change adc internal resistor value for better pen detection,
1066 * default value is 100 kOhm.
1067 * 0 = 200 kOhm, 1 = 150 kOhm, 2 = 100 kOhm, 3 = 50 kOhm
1068 * option only available on ES2 and higher
1069 */
1070 at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity
1071 & AT91_ADC_ACR_PENDETSENS);
1072
1073 /* Sample Period Time = (TRGPER + 1) / ADCClock */
1074 st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US *
1075 adc_clk_khz / 1000) - 1, 1);
1076
1077 return 0;
1078 }
1079
1080 static int at91_ts_register(struct at91_adc_state *st,
1081 struct platform_device *pdev)
1082 {
1083 struct input_dev *input;
1084 struct iio_dev *idev = iio_priv_to_dev(st);
1085 int ret;
1086
1087 input = input_allocate_device();
1088 if (!input) {
1089 dev_err(&idev->dev, "Failed to allocate TS device!\n");
1090 return -ENOMEM;
1091 }
1092
1093 input->name = DRIVER_NAME;
1094 input->id.bustype = BUS_HOST;
1095 input->dev.parent = &pdev->dev;
1096 input->open = atmel_ts_open;
1097 input->close = atmel_ts_close;
1098
1099 __set_bit(EV_ABS, input->evbit);
1100 __set_bit(EV_KEY, input->evbit);
1101 __set_bit(BTN_TOUCH, input->keybit);
1102 if (st->caps->has_tsmr) {
1103 input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1,
1104 0, 0);
1105 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1,
1106 0, 0);
1107 input_set_abs_params(input, ABS_PRESSURE, 0, 0xffffff, 0, 0);
1108 } else {
1109 if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) {
1110 dev_err(&pdev->dev,
1111 "This touchscreen controller only support 4 wires\n");
1112 ret = -EINVAL;
1113 goto err;
1114 }
1115
1116 input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1,
1117 0, 0);
1118 input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1,
1119 0, 0);
1120 }
1121
1122 st->ts_input = input;
1123 input_set_drvdata(input, st);
1124
1125 ret = input_register_device(input);
1126 if (ret)
1127 goto err;
1128
1129 return ret;
1130
1131 err:
1132 input_free_device(st->ts_input);
1133 return ret;
1134 }
1135
1136 static void at91_ts_unregister(struct at91_adc_state *st)
1137 {
1138 input_unregister_device(st->ts_input);
1139 }
1140
1141 static int at91_adc_probe(struct platform_device *pdev)
1142 {
1143 unsigned int prsc, mstrclk, ticks, adc_clk, adc_clk_khz, shtim;
1144 int ret;
1145 struct iio_dev *idev;
1146 struct at91_adc_state *st;
1147 struct resource *res;
1148 u32 reg;
1149
1150 idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state));
1151 if (!idev)
1152 return -ENOMEM;
1153
1154 st = iio_priv(idev);
1155
1156 if (pdev->dev.of_node)
1157 ret = at91_adc_probe_dt(st, pdev);
1158 else
1159 ret = at91_adc_probe_pdata(st, pdev);
1160
1161 if (ret) {
1162 dev_err(&pdev->dev, "No platform data available.\n");
1163 return -EINVAL;
1164 }
1165
1166 platform_set_drvdata(pdev, idev);
1167
1168 idev->dev.parent = &pdev->dev;
1169 idev->name = dev_name(&pdev->dev);
1170 idev->modes = INDIO_DIRECT_MODE;
1171 idev->info = &at91_adc_info;
1172
1173 st->irq = platform_get_irq(pdev, 0);
1174 if (st->irq < 0) {
1175 dev_err(&pdev->dev, "No IRQ ID is designated\n");
1176 return -ENODEV;
1177 }
1178
1179 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1180
1181 st->reg_base = devm_ioremap_resource(&pdev->dev, res);
1182 if (IS_ERR(st->reg_base)) {
1183 return PTR_ERR(st->reg_base);
1184 }
1185
1186 /*
1187 * Disable all IRQs before setting up the handler
1188 */
1189 at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST);
1190 at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF);
1191
1192 if (st->caps->has_tsmr)
1193 ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0,
1194 pdev->dev.driver->name, idev);
1195 else
1196 ret = request_irq(st->irq, at91_adc_rl_interrupt, 0,
1197 pdev->dev.driver->name, idev);
1198 if (ret) {
1199 dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
1200 return ret;
1201 }
1202
1203 st->clk = devm_clk_get(&pdev->dev, "adc_clk");
1204 if (IS_ERR(st->clk)) {
1205 dev_err(&pdev->dev, "Failed to get the clock.\n");
1206 ret = PTR_ERR(st->clk);
1207 goto error_free_irq;
1208 }
1209
1210 ret = clk_prepare_enable(st->clk);
1211 if (ret) {
1212 dev_err(&pdev->dev,
1213 "Could not prepare or enable the clock.\n");
1214 goto error_free_irq;
1215 }
1216
1217 st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk");
1218 if (IS_ERR(st->adc_clk)) {
1219 dev_err(&pdev->dev, "Failed to get the ADC clock.\n");
1220 ret = PTR_ERR(st->adc_clk);
1221 goto error_disable_clk;
1222 }
1223
1224 ret = clk_prepare_enable(st->adc_clk);
1225 if (ret) {
1226 dev_err(&pdev->dev,
1227 "Could not prepare or enable the ADC clock.\n");
1228 goto error_disable_clk;
1229 }
1230
1231 /*
1232 * Prescaler rate computation using the formula from the Atmel's
1233 * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being
1234 * specified by the electrical characteristics of the board.
1235 */
1236 mstrclk = clk_get_rate(st->clk);
1237 adc_clk = clk_get_rate(st->adc_clk);
1238 adc_clk_khz = adc_clk / 1000;
1239
1240 dev_dbg(&pdev->dev, "Master clock is set as: %d Hz, adc_clk should set as: %d Hz\n",
1241 mstrclk, adc_clk);
1242
1243 prsc = (mstrclk / (2 * adc_clk)) - 1;
1244
1245 if (!st->startup_time) {
1246 dev_err(&pdev->dev, "No startup time available.\n");
1247 ret = -EINVAL;
1248 goto error_disable_adc_clk;
1249 }
1250 ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz);
1251
1252 /*
1253 * a minimal Sample and Hold Time is necessary for the ADC to guarantee
1254 * the best converted final value between two channels selection
1255 * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock
1256 */
1257 if (st->sample_hold_time > 0)
1258 shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000)
1259 - 1, 1);
1260 else
1261 shtim = 0;
1262
1263 reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask;
1264 reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask;
1265 if (st->low_res)
1266 reg |= AT91_ADC_LOWRES;
1267 if (st->sleep_mode)
1268 reg |= AT91_ADC_SLEEP;
1269 reg |= AT91_ADC_SHTIM_(shtim) & AT91_ADC_SHTIM;
1270 at91_adc_writel(st, AT91_ADC_MR, reg);
1271
1272 /* Setup the ADC channels available on the board */
1273 ret = at91_adc_channel_init(idev);
1274 if (ret < 0) {
1275 dev_err(&pdev->dev, "Couldn't initialize the channels.\n");
1276 goto error_disable_adc_clk;
1277 }
1278
1279 init_waitqueue_head(&st->wq_data_avail);
1280 mutex_init(&st->lock);
1281
1282 /*
1283 * Since touch screen will set trigger register as period trigger. So
1284 * when touch screen is enabled, then we have to disable hardware
1285 * trigger for classic adc.
1286 */
1287 if (!st->touchscreen_type) {
1288 ret = at91_adc_buffer_init(idev);
1289 if (ret < 0) {
1290 dev_err(&pdev->dev, "Couldn't initialize the buffer.\n");
1291 goto error_disable_adc_clk;
1292 }
1293
1294 ret = at91_adc_trigger_init(idev);
1295 if (ret < 0) {
1296 dev_err(&pdev->dev, "Couldn't setup the triggers.\n");
1297 at91_adc_buffer_remove(idev);
1298 goto error_disable_adc_clk;
1299 }
1300 } else {
1301 ret = at91_ts_register(st, pdev);
1302 if (ret)
1303 goto error_disable_adc_clk;
1304
1305 at91_ts_hw_init(st, adc_clk_khz);
1306 }
1307
1308 ret = iio_device_register(idev);
1309 if (ret < 0) {
1310 dev_err(&pdev->dev, "Couldn't register the device.\n");
1311 goto error_iio_device_register;
1312 }
1313
1314 return 0;
1315
1316 error_iio_device_register:
1317 if (!st->touchscreen_type) {
1318 at91_adc_trigger_remove(idev);
1319 at91_adc_buffer_remove(idev);
1320 } else {
1321 at91_ts_unregister(st);
1322 }
1323 error_disable_adc_clk:
1324 clk_disable_unprepare(st->adc_clk);
1325 error_disable_clk:
1326 clk_disable_unprepare(st->clk);
1327 error_free_irq:
1328 free_irq(st->irq, idev);
1329 return ret;
1330 }
1331
1332 static int at91_adc_remove(struct platform_device *pdev)
1333 {
1334 struct iio_dev *idev = platform_get_drvdata(pdev);
1335 struct at91_adc_state *st = iio_priv(idev);
1336
1337 iio_device_unregister(idev);
1338 if (!st->touchscreen_type) {
1339 at91_adc_trigger_remove(idev);
1340 at91_adc_buffer_remove(idev);
1341 } else {
1342 at91_ts_unregister(st);
1343 }
1344 clk_disable_unprepare(st->adc_clk);
1345 clk_disable_unprepare(st->clk);
1346 free_irq(st->irq, idev);
1347
1348 return 0;
1349 }
1350
1351 #ifdef CONFIG_PM_SLEEP
1352 static int at91_adc_suspend(struct device *dev)
1353 {
1354 struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev));
1355 struct at91_adc_state *st = iio_priv(idev);
1356
1357 pinctrl_pm_select_sleep_state(dev);
1358 clk_disable_unprepare(st->clk);
1359
1360 return 0;
1361 }
1362
1363 static int at91_adc_resume(struct device *dev)
1364 {
1365 struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev));
1366 struct at91_adc_state *st = iio_priv(idev);
1367
1368 clk_prepare_enable(st->clk);
1369 pinctrl_pm_select_default_state(dev);
1370
1371 return 0;
1372 }
1373 #endif
1374
1375 static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume);
1376
1377 static struct at91_adc_caps at91sam9260_caps = {
1378 .calc_startup_ticks = calc_startup_ticks_9260,
1379 .num_channels = 4,
1380 .registers = {
1381 .channel_base = AT91_ADC_CHR(0),
1382 .drdy_mask = AT91_ADC_DRDY,
1383 .status_register = AT91_ADC_SR,
1384 .trigger_register = AT91_ADC_TRGR_9260,
1385 .mr_prescal_mask = AT91_ADC_PRESCAL_9260,
1386 .mr_startup_mask = AT91_ADC_STARTUP_9260,
1387 },
1388 };
1389
1390 static struct at91_adc_caps at91sam9rl_caps = {
1391 .has_ts = true,
1392 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */
1393 .num_channels = 6,
1394 .registers = {
1395 .channel_base = AT91_ADC_CHR(0),
1396 .drdy_mask = AT91_ADC_DRDY,
1397 .status_register = AT91_ADC_SR,
1398 .trigger_register = AT91_ADC_TRGR_9G45,
1399 .mr_prescal_mask = AT91_ADC_PRESCAL_9260,
1400 .mr_startup_mask = AT91_ADC_STARTUP_9G45,
1401 },
1402 };
1403
1404 static struct at91_adc_caps at91sam9g45_caps = {
1405 .has_ts = true,
1406 .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */
1407 .num_channels = 8,
1408 .registers = {
1409 .channel_base = AT91_ADC_CHR(0),
1410 .drdy_mask = AT91_ADC_DRDY,
1411 .status_register = AT91_ADC_SR,
1412 .trigger_register = AT91_ADC_TRGR_9G45,
1413 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45,
1414 .mr_startup_mask = AT91_ADC_STARTUP_9G45,
1415 },
1416 };
1417
1418 static struct at91_adc_caps at91sam9x5_caps = {
1419 .has_ts = true,
1420 .has_tsmr = true,
1421 .ts_filter_average = 3,
1422 .ts_pen_detect_sensitivity = 2,
1423 .calc_startup_ticks = calc_startup_ticks_9x5,
1424 .num_channels = 12,
1425 .registers = {
1426 .channel_base = AT91_ADC_CDR0_9X5,
1427 .drdy_mask = AT91_ADC_SR_DRDY_9X5,
1428 .status_register = AT91_ADC_SR_9X5,
1429 .trigger_register = AT91_ADC_TRGR_9X5,
1430 /* prescal mask is same as 9G45 */
1431 .mr_prescal_mask = AT91_ADC_PRESCAL_9G45,
1432 .mr_startup_mask = AT91_ADC_STARTUP_9X5,
1433 },
1434 };
1435
1436 static const struct of_device_id at91_adc_dt_ids[] = {
1437 { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps },
1438 { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps },
1439 { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps },
1440 { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps },
1441 {},
1442 };
1443 MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);
1444
1445 static const struct platform_device_id at91_adc_ids[] = {
1446 {
1447 .name = "at91sam9260-adc",
1448 .driver_data = (unsigned long)&at91sam9260_caps,
1449 }, {
1450 .name = "at91sam9rl-adc",
1451 .driver_data = (unsigned long)&at91sam9rl_caps,
1452 }, {
1453 .name = "at91sam9g45-adc",
1454 .driver_data = (unsigned long)&at91sam9g45_caps,
1455 }, {
1456 .name = "at91sam9x5-adc",
1457 .driver_data = (unsigned long)&at91sam9x5_caps,
1458 }, {
1459 /* terminator */
1460 }
1461 };
1462 MODULE_DEVICE_TABLE(platform, at91_adc_ids);
1463
1464 static struct platform_driver at91_adc_driver = {
1465 .probe = at91_adc_probe,
1466 .remove = at91_adc_remove,
1467 .id_table = at91_adc_ids,
1468 .driver = {
1469 .name = DRIVER_NAME,
1470 .of_match_table = of_match_ptr(at91_adc_dt_ids),
1471 .pm = &at91_adc_pm_ops,
1472 },
1473 };
1474
1475 module_platform_driver(at91_adc_driver);
1476
1477 MODULE_LICENSE("GPL");
1478 MODULE_DESCRIPTION("Atmel AT91 ADC Driver");
1479 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
Linux with added FPC-III support