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Patil, Rachna5e53a692012-10-16 12:55:45 +05301/*
2 * TI ADC MFD driver
3 *
4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
Patil, Rachna5e53a692012-10-16 12:55:45 +053016#include <linux/kernel.h>
17#include <linux/err.h>
18#include <linux/module.h>
19#include <linux/slab.h>
20#include <linux/interrupt.h>
21#include <linux/platform_device.h>
22#include <linux/io.h>
23#include <linux/iio/iio.h>
Patil, Rachna6f39ac42013-01-24 03:45:11 +000024#include <linux/of.h>
25#include <linux/of_device.h>
Pantelis Antoniouc80df482012-10-13 16:37:24 +030026#include <linux/iio/machine.h>
27#include <linux/iio/driver.h>
Patil, Rachna5e53a692012-10-16 12:55:45 +053028
29#include <linux/mfd/ti_am335x_tscadc.h>
Zubair Lutfullahca9a5632013-09-19 07:24:00 +010030#include <linux/iio/buffer.h>
31#include <linux/iio/kfifo_buf.h>
Patil, Rachna5e53a692012-10-16 12:55:45 +053032
33struct tiadc_device {
34 struct ti_tscadc_dev *mfd_tscadc;
35 int channels;
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +020036 u8 channel_line[8];
37 u8 channel_step[8];
Zubair Lutfullahca9a5632013-09-19 07:24:00 +010038 int buffer_en_ch_steps;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +010039 u16 data[8];
Patil, Rachna5e53a692012-10-16 12:55:45 +053040};
41
42static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
43{
44 return readl(adc->mfd_tscadc->tscadc_base + reg);
45}
46
47static void tiadc_writel(struct tiadc_device *adc, unsigned int reg,
48 unsigned int val)
49{
50 writel(val, adc->mfd_tscadc->tscadc_base + reg);
51}
52
Patil, Rachnaabeccee2013-01-24 03:45:05 +000053static u32 get_adc_step_mask(struct tiadc_device *adc_dev)
54{
55 u32 step_en;
56
57 step_en = ((1 << adc_dev->channels) - 1);
58 step_en <<= TOTAL_STEPS - adc_dev->channels + 1;
59 return step_en;
60}
61
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +010062static u32 get_adc_chan_step_mask(struct tiadc_device *adc_dev,
63 struct iio_chan_spec const *chan)
64{
65 int i;
66
67 for (i = 0; i < ARRAY_SIZE(adc_dev->channel_step); i++) {
68 if (chan->channel == adc_dev->channel_line[i]) {
69 u32 step;
70
71 step = adc_dev->channel_step[i];
72 /* +1 for the charger */
73 return 1 << (step + 1);
74 }
75 }
76 WARN_ON(1);
77 return 0;
78}
79
Zubair Lutfullahca9a5632013-09-19 07:24:00 +010080static u32 get_adc_step_bit(struct tiadc_device *adc_dev, int chan)
Patil, Rachna5e53a692012-10-16 12:55:45 +053081{
Zubair Lutfullahca9a5632013-09-19 07:24:00 +010082 return 1 << adc_dev->channel_step[chan];
83}
84
85static void tiadc_step_config(struct iio_dev *indio_dev)
86{
87 struct tiadc_device *adc_dev = iio_priv(indio_dev);
Patil, Rachna5e53a692012-10-16 12:55:45 +053088 unsigned int stepconfig;
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +020089 int i, steps;
Patil, Rachna5e53a692012-10-16 12:55:45 +053090
91 /*
92 * There are 16 configurable steps and 8 analog input
93 * lines available which are shared between Touchscreen and ADC.
94 *
95 * Steps backwards i.e. from 16 towards 0 are used by ADC
96 * depending on number of input lines needed.
97 * Channel would represent which analog input
98 * needs to be given to ADC to digitalize data.
99 */
100
101 steps = TOTAL_STEPS - adc_dev->channels;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100102 if (iio_buffer_enabled(indio_dev))
103 stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1
104 | STEPCONFIG_MODE_SWCNT;
105 else
106 stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530107
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200108 for (i = 0; i < adc_dev->channels; i++) {
109 int chan;
110
111 chan = adc_dev->channel_line[i];
112 tiadc_writel(adc_dev, REG_STEPCONFIG(steps),
113 stepconfig | STEPCONFIG_INP(chan));
114 tiadc_writel(adc_dev, REG_STEPDELAY(steps),
Patil, Rachna5e53a692012-10-16 12:55:45 +0530115 STEPCONFIG_OPENDLY);
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200116 adc_dev->channel_step[i] = steps;
117 steps++;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530118 }
Patil, Rachna5e53a692012-10-16 12:55:45 +0530119}
120
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100121static irqreturn_t tiadc_irq_h(int irq, void *private)
122{
123 struct iio_dev *indio_dev = private;
124 struct tiadc_device *adc_dev = iio_priv(indio_dev);
125 unsigned int status, config;
126 status = tiadc_readl(adc_dev, REG_IRQSTATUS);
127
128 /*
129 * ADC and touchscreen share the IRQ line.
130 * FIFO0 interrupts are used by TSC. Handle FIFO1 IRQs here only
131 */
132 if (status & IRQENB_FIFO1OVRRUN) {
133 /* FIFO Overrun. Clear flag. Disable/Enable ADC to recover */
134 config = tiadc_readl(adc_dev, REG_CTRL);
135 config &= ~(CNTRLREG_TSCSSENB);
136 tiadc_writel(adc_dev, REG_CTRL, config);
137 tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1OVRRUN
138 | IRQENB_FIFO1UNDRFLW | IRQENB_FIFO1THRES);
139 tiadc_writel(adc_dev, REG_CTRL, (config | CNTRLREG_TSCSSENB));
140 return IRQ_HANDLED;
141 } else if (status & IRQENB_FIFO1THRES) {
142 /* Disable irq and wake worker thread */
143 tiadc_writel(adc_dev, REG_IRQCLR, IRQENB_FIFO1THRES);
144 return IRQ_WAKE_THREAD;
145 }
146
147 return IRQ_NONE;
148}
149
150static irqreturn_t tiadc_worker_h(int irq, void *private)
151{
152 struct iio_dev *indio_dev = private;
153 struct tiadc_device *adc_dev = iio_priv(indio_dev);
154 int i, k, fifo1count, read;
155 u16 *data = adc_dev->data;
156
157 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
158 for (k = 0; k < fifo1count; k = k + i) {
159 for (i = 0; i < (indio_dev->scan_bytes)/2; i++) {
160 read = tiadc_readl(adc_dev, REG_FIFO1);
161 data[i] = read & FIFOREAD_DATA_MASK;
162 }
163 iio_push_to_buffers(indio_dev, (u8 *) data);
164 }
165
166 tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1THRES);
167 tiadc_writel(adc_dev, REG_IRQENABLE, IRQENB_FIFO1THRES);
168
169 return IRQ_HANDLED;
170}
171
172static int tiadc_buffer_preenable(struct iio_dev *indio_dev)
173{
174 struct tiadc_device *adc_dev = iio_priv(indio_dev);
175 int i, fifo1count, read;
176
177 tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES |
178 IRQENB_FIFO1OVRRUN |
179 IRQENB_FIFO1UNDRFLW));
180
181 /* Flush FIFO. Needed in corner cases in simultaneous tsc/adc use */
182 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
183 for (i = 0; i < fifo1count; i++)
184 read = tiadc_readl(adc_dev, REG_FIFO1);
185
Lars-Peter Clausen24adaf72013-10-14 17:49:00 +0100186 return 0;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100187}
188
189static int tiadc_buffer_postenable(struct iio_dev *indio_dev)
190{
191 struct tiadc_device *adc_dev = iio_priv(indio_dev);
192 struct iio_buffer *buffer = indio_dev->buffer;
193 unsigned int enb = 0;
194 u8 bit;
195
196 tiadc_step_config(indio_dev);
197 for_each_set_bit(bit, buffer->scan_mask, adc_dev->channels)
198 enb |= (get_adc_step_bit(adc_dev, bit) << 1);
199 adc_dev->buffer_en_ch_steps = enb;
200
Sebastian Andrzej Siewior7e170c62013-12-19 16:28:29 +0100201 am335x_tsc_se_set_cache(adc_dev->mfd_tscadc, enb);
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100202
203 tiadc_writel(adc_dev, REG_IRQSTATUS, IRQENB_FIFO1THRES
204 | IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW);
205 tiadc_writel(adc_dev, REG_IRQENABLE, IRQENB_FIFO1THRES
206 | IRQENB_FIFO1OVRRUN);
207
208 return 0;
209}
210
211static int tiadc_buffer_predisable(struct iio_dev *indio_dev)
212{
213 struct tiadc_device *adc_dev = iio_priv(indio_dev);
214 int fifo1count, i, read;
215
216 tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES |
217 IRQENB_FIFO1OVRRUN | IRQENB_FIFO1UNDRFLW));
218 am335x_tsc_se_clr(adc_dev->mfd_tscadc, adc_dev->buffer_en_ch_steps);
Sebastian Andrzej Siewior3954b7b2013-12-19 16:28:30 +0100219 adc_dev->buffer_en_ch_steps = 0;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100220
221 /* Flush FIFO of leftover data in the time it takes to disable adc */
222 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
223 for (i = 0; i < fifo1count; i++)
224 read = tiadc_readl(adc_dev, REG_FIFO1);
225
226 return 0;
227}
228
229static int tiadc_buffer_postdisable(struct iio_dev *indio_dev)
230{
231 tiadc_step_config(indio_dev);
232
233 return 0;
234}
235
236static const struct iio_buffer_setup_ops tiadc_buffer_setup_ops = {
237 .preenable = &tiadc_buffer_preenable,
238 .postenable = &tiadc_buffer_postenable,
239 .predisable = &tiadc_buffer_predisable,
240 .postdisable = &tiadc_buffer_postdisable,
241};
242
Zubair Lutfullah98c08cf2013-09-22 09:20:00 +0100243static int tiadc_iio_buffered_hardware_setup(struct iio_dev *indio_dev,
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100244 irqreturn_t (*pollfunc_bh)(int irq, void *p),
245 irqreturn_t (*pollfunc_th)(int irq, void *p),
246 int irq,
247 unsigned long flags,
248 const struct iio_buffer_setup_ops *setup_ops)
249{
Lars-Peter Clausenfe269802013-10-24 10:41:00 +0100250 struct iio_buffer *buffer;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100251 int ret;
252
Lars-Peter Clausenfe269802013-10-24 10:41:00 +0100253 buffer = iio_kfifo_allocate(indio_dev);
254 if (!buffer)
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100255 return -ENOMEM;
256
Lars-Peter Clausenfe269802013-10-24 10:41:00 +0100257 iio_device_attach_buffer(indio_dev, buffer);
258
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100259 ret = request_threaded_irq(irq, pollfunc_th, pollfunc_bh,
260 flags, indio_dev->name, indio_dev);
261 if (ret)
262 goto error_kfifo_free;
263
264 indio_dev->setup_ops = setup_ops;
265 indio_dev->modes |= INDIO_BUFFER_HARDWARE;
266
267 ret = iio_buffer_register(indio_dev,
268 indio_dev->channels,
269 indio_dev->num_channels);
270 if (ret)
271 goto error_free_irq;
272
273 return 0;
274
275error_free_irq:
276 free_irq(irq, indio_dev);
277error_kfifo_free:
278 iio_kfifo_free(indio_dev->buffer);
279 return ret;
280}
281
282static void tiadc_iio_buffered_hardware_remove(struct iio_dev *indio_dev)
283{
284 struct tiadc_device *adc_dev = iio_priv(indio_dev);
285
286 free_irq(adc_dev->mfd_tscadc->irq, indio_dev);
287 iio_kfifo_free(indio_dev->buffer);
288 iio_buffer_unregister(indio_dev);
289}
290
291
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300292static const char * const chan_name_ain[] = {
293 "AIN0",
294 "AIN1",
295 "AIN2",
296 "AIN3",
297 "AIN4",
298 "AIN5",
299 "AIN6",
300 "AIN7",
301};
302
Patil, Rachna5e53a692012-10-16 12:55:45 +0530303static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
304{
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300305 struct tiadc_device *adc_dev = iio_priv(indio_dev);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530306 struct iio_chan_spec *chan_array;
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300307 struct iio_chan_spec *chan;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530308 int i;
309
310 indio_dev->num_channels = channels;
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300311 chan_array = kcalloc(channels,
Patil, Rachna5e53a692012-10-16 12:55:45 +0530312 sizeof(struct iio_chan_spec), GFP_KERNEL);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530313 if (chan_array == NULL)
314 return -ENOMEM;
315
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300316 chan = chan_array;
317 for (i = 0; i < channels; i++, chan++) {
318
Patil, Rachna5e53a692012-10-16 12:55:45 +0530319 chan->type = IIO_VOLTAGE;
320 chan->indexed = 1;
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200321 chan->channel = adc_dev->channel_line[i];
Jonathan Cameron6c572522013-02-27 19:07:18 +0000322 chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200323 chan->datasheet_name = chan_name_ain[chan->channel];
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100324 chan->scan_index = i;
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300325 chan->scan_type.sign = 'u';
326 chan->scan_type.realbits = 12;
Zubair Lutfullah0f6fc7d2013-09-19 07:24:00 +0100327 chan->scan_type.storagebits = 16;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530328 }
329
330 indio_dev->channels = chan_array;
331
Pantelis Antoniouc80df482012-10-13 16:37:24 +0300332 return 0;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530333}
334
335static void tiadc_channels_remove(struct iio_dev *indio_dev)
336{
337 kfree(indio_dev->channels);
338}
339
340static int tiadc_read_raw(struct iio_dev *indio_dev,
341 struct iio_chan_spec const *chan,
342 int *val, int *val2, long mask)
343{
344 struct tiadc_device *adc_dev = iio_priv(indio_dev);
Patil, Rachnab1451e52013-07-20 17:27:00 +0100345 int i, map_val;
346 unsigned int fifo1count, read, stepid;
Sebastian Andrzej Siewior1460c152013-05-29 18:49:55 +0200347 bool found = false;
Patil, Rachnab1451e52013-07-20 17:27:00 +0100348 u32 step_en;
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100349 unsigned long timeout;
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100350
351 if (iio_buffer_enabled(indio_dev))
352 return -EBUSY;
353
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100354 step_en = get_adc_chan_step_mask(adc_dev, chan);
355 if (!step_en)
356 return -EINVAL;
Patil, Rachnab1451e52013-07-20 17:27:00 +0100357
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100358 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
359 while (fifo1count--)
360 tiadc_readl(adc_dev, REG_FIFO1);
361
Sebastian Andrzej Siewior7e170c62013-12-19 16:28:29 +0100362 am335x_tsc_se_set_once(adc_dev->mfd_tscadc, step_en);
Patil, Rachnab1451e52013-07-20 17:27:00 +0100363
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100364 timeout = jiffies + usecs_to_jiffies
365 (IDLE_TIMEOUT * adc_dev->channels);
366 /* Wait for Fifo threshold interrupt */
367 while (1) {
368 fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
369 if (fifo1count)
370 break;
371
372 if (time_after(jiffies, timeout)) {
373 am335x_tsc_se_adc_done(adc_dev->mfd_tscadc);
Patil, Rachnab1451e52013-07-20 17:27:00 +0100374 return -EAGAIN;
375 }
Sebastian Andrzej Siewiorfb7f8ce2013-12-19 16:28:27 +0100376 }
Jan Kardellbaa3c652014-11-06 22:18:00 +0000377 map_val = adc_dev->channel_step[chan->scan_index];
Patil, Rachna5e53a692012-10-16 12:55:45 +0530378
379 /*
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100380 * We check the complete FIFO. We programmed just one entry but in case
381 * something went wrong we left empty handed (-EAGAIN previously) and
382 * then the value apeared somehow in the FIFO we would have two entries.
383 * Therefore we read every item and keep only the latest version of the
384 * requested channel.
Patil, Rachna5e53a692012-10-16 12:55:45 +0530385 */
Patil, Rachna5e53a692012-10-16 12:55:45 +0530386 for (i = 0; i < fifo1count; i++) {
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200387 read = tiadc_readl(adc_dev, REG_FIFO1);
Patil, Rachnab1451e52013-07-20 17:27:00 +0100388 stepid = read & FIFOREAD_CHNLID_MASK;
389 stepid = stepid >> 0x10;
390
391 if (stepid == map_val) {
392 read = read & FIFOREAD_DATA_MASK;
Sebastian Andrzej Siewior1460c152013-05-29 18:49:55 +0200393 found = true;
Zubair Lutfullah0f6fc7d2013-09-19 07:24:00 +0100394 *val = (u16) read;
Sebastian Andrzej Siewior1460c152013-05-29 18:49:55 +0200395 }
Patil, Rachna5e53a692012-10-16 12:55:45 +0530396 }
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100397 am335x_tsc_se_adc_done(adc_dev->mfd_tscadc);
Patil, Rachnab1451e52013-07-20 17:27:00 +0100398
Sebastian Andrzej Siewior1460c152013-05-29 18:49:55 +0200399 if (found == false)
400 return -EBUSY;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530401 return IIO_VAL_INT;
402}
403
404static const struct iio_info tiadc_info = {
405 .read_raw = &tiadc_read_raw,
Wei Yongjunbc93aa72013-07-06 05:20:00 +0100406 .driver_module = THIS_MODULE,
Patil, Rachna5e53a692012-10-16 12:55:45 +0530407};
408
Greg Kroah-Hartmanfc526922012-12-21 13:21:43 -0800409static int tiadc_probe(struct platform_device *pdev)
Patil, Rachna5e53a692012-10-16 12:55:45 +0530410{
411 struct iio_dev *indio_dev;
412 struct tiadc_device *adc_dev;
Patil, Rachna6f39ac42013-01-24 03:45:11 +0000413 struct device_node *node = pdev->dev.of_node;
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200414 struct property *prop;
415 const __be32 *cur;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530416 int err;
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200417 u32 val;
418 int channels = 0;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530419
Sebastian Andrzej Siewior0ead4fb2013-05-21 17:49:22 +0200420 if (!node) {
421 dev_err(&pdev->dev, "Could not find valid DT data.\n");
Patil, Rachna5e53a692012-10-16 12:55:45 +0530422 return -EINVAL;
423 }
424
Sachin Kamata0648132013-07-23 09:46:00 +0100425 indio_dev = devm_iio_device_alloc(&pdev->dev,
426 sizeof(struct tiadc_device));
Patil, Rachna5e53a692012-10-16 12:55:45 +0530427 if (indio_dev == NULL) {
428 dev_err(&pdev->dev, "failed to allocate iio device\n");
Sachin Kamata0648132013-07-23 09:46:00 +0100429 return -ENOMEM;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530430 }
431 adc_dev = iio_priv(indio_dev);
432
Patil, Rachna6f39ac42013-01-24 03:45:11 +0000433 adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
434
Sebastian Andrzej Siewior18926ed2013-05-29 17:39:02 +0200435 of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
436 adc_dev->channel_line[channels] = val;
437 channels++;
438 }
439 adc_dev->channels = channels;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530440
441 indio_dev->dev.parent = &pdev->dev;
442 indio_dev->name = dev_name(&pdev->dev);
443 indio_dev->modes = INDIO_DIRECT_MODE;
444 indio_dev->info = &tiadc_info;
445
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100446 tiadc_step_config(indio_dev);
447 tiadc_writel(adc_dev, REG_FIFO1THR, FIFO1_THRESHOLD);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530448
449 err = tiadc_channel_init(indio_dev, adc_dev->channels);
450 if (err < 0)
Sachin Kamata0648132013-07-23 09:46:00 +0100451 return err;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530452
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100453 err = tiadc_iio_buffered_hardware_setup(indio_dev,
454 &tiadc_worker_h,
455 &tiadc_irq_h,
456 adc_dev->mfd_tscadc->irq,
457 IRQF_SHARED,
458 &tiadc_buffer_setup_ops);
459
Patil, Rachna5e53a692012-10-16 12:55:45 +0530460 if (err)
461 goto err_free_channels;
462
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100463 err = iio_device_register(indio_dev);
464 if (err)
465 goto err_buffer_unregister;
466
Patil, Rachna5e53a692012-10-16 12:55:45 +0530467 platform_set_drvdata(pdev, indio_dev);
468
469 return 0;
470
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100471err_buffer_unregister:
472 tiadc_iio_buffered_hardware_remove(indio_dev);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530473err_free_channels:
474 tiadc_channels_remove(indio_dev);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530475 return err;
476}
477
Greg Kroah-Hartmanfc526922012-12-21 13:21:43 -0800478static int tiadc_remove(struct platform_device *pdev)
Patil, Rachna5e53a692012-10-16 12:55:45 +0530479{
480 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
Patil, Rachnaabeccee2013-01-24 03:45:05 +0000481 struct tiadc_device *adc_dev = iio_priv(indio_dev);
482 u32 step_en;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530483
484 iio_device_unregister(indio_dev);
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100485 tiadc_iio_buffered_hardware_remove(indio_dev);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530486 tiadc_channels_remove(indio_dev);
487
Patil, Rachnaabeccee2013-01-24 03:45:05 +0000488 step_en = get_adc_step_mask(adc_dev);
489 am335x_tsc_se_clr(adc_dev->mfd_tscadc, step_en);
490
Patil, Rachna5e53a692012-10-16 12:55:45 +0530491 return 0;
492}
493
494#ifdef CONFIG_PM
495static int tiadc_suspend(struct device *dev)
496{
497 struct iio_dev *indio_dev = dev_get_drvdata(dev);
498 struct tiadc_device *adc_dev = iio_priv(indio_dev);
Sebastian Andrzej Siewiora9bce1b2013-06-05 16:13:47 +0200499 struct ti_tscadc_dev *tscadc_dev;
Patil, Rachna5e53a692012-10-16 12:55:45 +0530500 unsigned int idle;
501
Sebastian Andrzej Siewiora9bce1b2013-06-05 16:13:47 +0200502 tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
Patil, Rachna5e53a692012-10-16 12:55:45 +0530503 if (!device_may_wakeup(tscadc_dev->dev)) {
504 idle = tiadc_readl(adc_dev, REG_CTRL);
505 idle &= ~(CNTRLREG_TSCSSENB);
506 tiadc_writel(adc_dev, REG_CTRL, (idle |
507 CNTRLREG_POWERDOWN));
508 }
509
510 return 0;
511}
512
513static int tiadc_resume(struct device *dev)
514{
515 struct iio_dev *indio_dev = dev_get_drvdata(dev);
516 struct tiadc_device *adc_dev = iio_priv(indio_dev);
517 unsigned int restore;
518
519 /* Make sure ADC is powered up */
520 restore = tiadc_readl(adc_dev, REG_CTRL);
521 restore &= ~(CNTRLREG_POWERDOWN);
522 tiadc_writel(adc_dev, REG_CTRL, restore);
523
Zubair Lutfullahca9a5632013-09-19 07:24:00 +0100524 tiadc_step_config(indio_dev);
Sebastian Andrzej Siewior7ca67402013-12-19 16:28:31 +0100525 am335x_tsc_se_set_cache(adc_dev->mfd_tscadc,
526 adc_dev->buffer_en_ch_steps);
Patil, Rachna5e53a692012-10-16 12:55:45 +0530527 return 0;
528}
529
530static const struct dev_pm_ops tiadc_pm_ops = {
531 .suspend = tiadc_suspend,
532 .resume = tiadc_resume,
533};
534#define TIADC_PM_OPS (&tiadc_pm_ops)
535#else
536#define TIADC_PM_OPS NULL
537#endif
538
Patil, Rachna6f39ac42013-01-24 03:45:11 +0000539static const struct of_device_id ti_adc_dt_ids[] = {
540 { .compatible = "ti,am3359-adc", },
541 { }
542};
543MODULE_DEVICE_TABLE(of, ti_adc_dt_ids);
544
Patil, Rachna5e53a692012-10-16 12:55:45 +0530545static struct platform_driver tiadc_driver = {
546 .driver = {
Sebastian Andrzej Siewior9f999282013-05-27 17:12:52 +0200547 .name = "TI-am335x-adc",
Patil, Rachna5e53a692012-10-16 12:55:45 +0530548 .owner = THIS_MODULE,
549 .pm = TIADC_PM_OPS,
Sachin Kamatde06b342013-10-21 10:27:00 +0100550 .of_match_table = ti_adc_dt_ids,
Patil, Rachna5e53a692012-10-16 12:55:45 +0530551 },
552 .probe = tiadc_probe,
Greg Kroah-Hartmanfc526922012-12-21 13:21:43 -0800553 .remove = tiadc_remove,
Patil, Rachna5e53a692012-10-16 12:55:45 +0530554};
Patil, Rachna5e53a692012-10-16 12:55:45 +0530555module_platform_driver(tiadc_driver);
556
557MODULE_DESCRIPTION("TI ADC controller driver");
558MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
559MODULE_LICENSE("GPL");