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9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/mod_devicetable.h>
12#include <linux/platform_device.h>
13#include <linux/sched.h>
14#include <linux/list.h>
15#include <linux/slab.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/regulator/consumer.h>
21
22#include "regs-adc.h"
23#include <linux/soc/samsung/s3c-adc.h>
24
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28
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36
37
38enum s3c_cpu_type {
39 TYPE_ADCV1,
40 TYPE_ADCV11,
41 TYPE_ADCV12,
42 TYPE_ADCV2,
43 TYPE_ADCV3,
44};
45
46struct s3c_adc_client {
47 struct platform_device *pdev;
48 struct list_head pend;
49 wait_queue_head_t *wait;
50
51 unsigned int nr_samples;
52 int result;
53 unsigned char is_ts;
54 unsigned char channel;
55
56 void (*select_cb)(struct s3c_adc_client *c, unsigned selected);
57 void (*convert_cb)(struct s3c_adc_client *c,
58 unsigned val1, unsigned val2,
59 unsigned *samples_left);
60};
61
62struct adc_device {
63 struct platform_device *pdev;
64 struct platform_device *owner;
65 struct clk *clk;
66 struct s3c_adc_client *cur;
67 struct s3c_adc_client *ts_pend;
68 void __iomem *regs;
69 spinlock_t lock;
70
71 unsigned int prescale;
72
73 int irq;
74 struct regulator *vdd;
75};
76
77static struct adc_device *adc_dev;
78
79static LIST_HEAD(adc_pending);
80
81#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
82
83static inline void s3c_adc_convert(struct adc_device *adc)
84{
85 unsigned con = readl(adc->regs + S3C2410_ADCCON);
86
87 con |= S3C2410_ADCCON_ENABLE_START;
88 writel(con, adc->regs + S3C2410_ADCCON);
89}
90
91static inline void s3c_adc_select(struct adc_device *adc,
92 struct s3c_adc_client *client)
93{
94 unsigned con = readl(adc->regs + S3C2410_ADCCON);
95 enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
96
97 client->select_cb(client, 1);
98
99 if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV2)
100 con &= ~S3C2410_ADCCON_MUXMASK;
101 con &= ~S3C2410_ADCCON_STDBM;
102 con &= ~S3C2410_ADCCON_STARTMASK;
103
104 if (!client->is_ts) {
105 if (cpu == TYPE_ADCV3)
106 writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);
107 else if (cpu == TYPE_ADCV11 || cpu == TYPE_ADCV12)
108 writel(client->channel & 0xf,
109 adc->regs + S3C2443_ADCMUX);
110 else
111 con |= S3C2410_ADCCON_SELMUX(client->channel);
112 }
113
114 writel(con, adc->regs + S3C2410_ADCCON);
115}
116
117static void s3c_adc_dbgshow(struct adc_device *adc)
118{
119 adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
120 readl(adc->regs + S3C2410_ADCCON),
121 readl(adc->regs + S3C2410_ADCTSC),
122 readl(adc->regs + S3C2410_ADCDLY));
123}
124
125static void s3c_adc_try(struct adc_device *adc)
126{
127 struct s3c_adc_client *next = adc->ts_pend;
128
129 if (!next && !list_empty(&adc_pending)) {
130 next = list_first_entry(&adc_pending,
131 struct s3c_adc_client, pend);
132 list_del(&next->pend);
133 } else
134 adc->ts_pend = NULL;
135
136 if (next) {
137 adc_dbg(adc, "new client is %p\n", next);
138 adc->cur = next;
139 s3c_adc_select(adc, next);
140 s3c_adc_convert(adc);
141 s3c_adc_dbgshow(adc);
142 }
143}
144
145int s3c_adc_start(struct s3c_adc_client *client,
146 unsigned int channel, unsigned int nr_samples)
147{
148 struct adc_device *adc = adc_dev;
149 unsigned long flags;
150
151 if (!adc) {
152 printk(KERN_ERR "%s: failed to find adc\n", __func__);
153 return -EINVAL;
154 }
155
156 spin_lock_irqsave(&adc->lock, flags);
157
158 if (client->is_ts && adc->ts_pend) {
159 spin_unlock_irqrestore(&adc->lock, flags);
160 return -EAGAIN;
161 }
162
163 client->channel = channel;
164 client->nr_samples = nr_samples;
165
166 if (client->is_ts)
167 adc->ts_pend = client;
168 else
169 list_add_tail(&client->pend, &adc_pending);
170
171 if (!adc->cur)
172 s3c_adc_try(adc);
173
174 spin_unlock_irqrestore(&adc->lock, flags);
175
176 return 0;
177}
178EXPORT_SYMBOL_GPL(s3c_adc_start);
179
180static void s3c_convert_done(struct s3c_adc_client *client,
181 unsigned v, unsigned u, unsigned *left)
182{
183 client->result = v;
184 wake_up(client->wait);
185}
186
187int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
188{
189 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
190 int ret;
191
192 client->convert_cb = s3c_convert_done;
193 client->wait = &wake;
194 client->result = -1;
195
196 ret = s3c_adc_start(client, ch, 1);
197 if (ret < 0)
198 goto err;
199
200 ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
201 if (client->result < 0) {
202 ret = -ETIMEDOUT;
203 goto err;
204 }
205
206 client->convert_cb = NULL;
207 return client->result;
208
209err:
210 return ret;
211}
212EXPORT_SYMBOL_GPL(s3c_adc_read);
213
214static void s3c_adc_default_select(struct s3c_adc_client *client,
215 unsigned select)
216{
217}
218
219struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
220 void (*select)(struct s3c_adc_client *client,
221 unsigned int selected),
222 void (*conv)(struct s3c_adc_client *client,
223 unsigned d0, unsigned d1,
224 unsigned *samples_left),
225 unsigned int is_ts)
226{
227 struct s3c_adc_client *client;
228
229 WARN_ON(!pdev);
230
231 if (!select)
232 select = s3c_adc_default_select;
233
234 if (!pdev)
235 return ERR_PTR(-EINVAL);
236
237 client = kzalloc(sizeof(*client), GFP_KERNEL);
238 if (!client)
239 return ERR_PTR(-ENOMEM);
240
241 client->pdev = pdev;
242 client->is_ts = is_ts;
243 client->select_cb = select;
244 client->convert_cb = conv;
245
246 return client;
247}
248EXPORT_SYMBOL_GPL(s3c_adc_register);
249
250void s3c_adc_release(struct s3c_adc_client *client)
251{
252 unsigned long flags;
253
254 spin_lock_irqsave(&adc_dev->lock, flags);
255
256
257 if (adc_dev->cur == client)
258 adc_dev->cur = NULL;
259 if (adc_dev->ts_pend == client)
260 adc_dev->ts_pend = NULL;
261 else {
262 struct list_head *p, *n;
263 struct s3c_adc_client *tmp;
264
265 list_for_each_safe(p, n, &adc_pending) {
266 tmp = list_entry(p, struct s3c_adc_client, pend);
267 if (tmp == client)
268 list_del(&tmp->pend);
269 }
270 }
271
272 if (adc_dev->cur == NULL)
273 s3c_adc_try(adc_dev);
274
275 spin_unlock_irqrestore(&adc_dev->lock, flags);
276 kfree(client);
277}
278EXPORT_SYMBOL_GPL(s3c_adc_release);
279
280static irqreturn_t s3c_adc_irq(int irq, void *pw)
281{
282 struct adc_device *adc = pw;
283 struct s3c_adc_client *client = adc->cur;
284 enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
285 unsigned data0, data1;
286
287 if (!client) {
288 dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
289 goto exit;
290 }
291
292 data0 = readl(adc->regs + S3C2410_ADCDAT0);
293 data1 = readl(adc->regs + S3C2410_ADCDAT1);
294 adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
295
296 client->nr_samples--;
297
298 if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV11) {
299 data0 &= 0x3ff;
300 data1 &= 0x3ff;
301 } else {
302
303 data0 &= 0xfff;
304 data1 &= 0xfff;
305 }
306
307 if (client->convert_cb)
308 (client->convert_cb)(client, data0, data1, &client->nr_samples);
309
310 if (client->nr_samples > 0) {
311
312
313 client->select_cb(client, 1);
314 s3c_adc_convert(adc);
315 } else {
316 spin_lock(&adc->lock);
317 (client->select_cb)(client, 0);
318 adc->cur = NULL;
319
320 s3c_adc_try(adc);
321 spin_unlock(&adc->lock);
322 }
323
324exit:
325 if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) {
326
327 writel(0, adc->regs + S3C64XX_ADCCLRINT);
328 }
329 return IRQ_HANDLED;
330}
331
332static int s3c_adc_probe(struct platform_device *pdev)
333{
334 struct device *dev = &pdev->dev;
335 struct adc_device *adc;
336 enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
337 int ret;
338 unsigned tmp;
339
340 adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL);
341 if (!adc)
342 return -ENOMEM;
343
344 spin_lock_init(&adc->lock);
345
346 adc->pdev = pdev;
347 adc->prescale = S3C2410_ADCCON_PRSCVL(49);
348
349 adc->vdd = devm_regulator_get(dev, "vdd");
350 if (IS_ERR(adc->vdd)) {
351 dev_err(dev, "operating without regulator \"vdd\" .\n");
352 return PTR_ERR(adc->vdd);
353 }
354
355 adc->irq = platform_get_irq(pdev, 1);
356 if (adc->irq <= 0)
357 return -ENOENT;
358
359 ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev),
360 adc);
361 if (ret < 0) {
362 dev_err(dev, "failed to attach adc irq\n");
363 return ret;
364 }
365
366 adc->clk = devm_clk_get(dev, "adc");
367 if (IS_ERR(adc->clk)) {
368 dev_err(dev, "failed to get adc clock\n");
369 return PTR_ERR(adc->clk);
370 }
371
372 adc->regs = devm_platform_ioremap_resource(pdev, 0);
373 if (IS_ERR(adc->regs))
374 return PTR_ERR(adc->regs);
375
376 ret = regulator_enable(adc->vdd);
377 if (ret)
378 return ret;
379
380 clk_prepare_enable(adc->clk);
381
382 tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
383
384
385 if (cpu == TYPE_ADCV12)
386 tmp |= S3C2416_ADCCON_RESSEL;
387 if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
388 tmp |= S3C64XX_ADCCON_RESSEL;
389
390 writel(tmp, adc->regs + S3C2410_ADCCON);
391
392 dev_info(dev, "attached adc driver\n");
393
394 platform_set_drvdata(pdev, adc);
395 adc_dev = adc;
396
397 return 0;
398}
399
400static int s3c_adc_remove(struct platform_device *pdev)
401{
402 struct adc_device *adc = platform_get_drvdata(pdev);
403
404 clk_disable_unprepare(adc->clk);
405 regulator_disable(adc->vdd);
406
407 return 0;
408}
409
410#ifdef CONFIG_PM
411static int s3c_adc_suspend(struct device *dev)
412{
413 struct adc_device *adc = dev_get_drvdata(dev);
414 unsigned long flags;
415 u32 con;
416
417 spin_lock_irqsave(&adc->lock, flags);
418
419 con = readl(adc->regs + S3C2410_ADCCON);
420 con |= S3C2410_ADCCON_STDBM;
421 writel(con, adc->regs + S3C2410_ADCCON);
422
423 disable_irq(adc->irq);
424 spin_unlock_irqrestore(&adc->lock, flags);
425 clk_disable(adc->clk);
426 regulator_disable(adc->vdd);
427
428 return 0;
429}
430
431static int s3c_adc_resume(struct device *dev)
432{
433 struct platform_device *pdev = to_platform_device(dev);
434 struct adc_device *adc = platform_get_drvdata(pdev);
435 enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
436 int ret;
437 unsigned long tmp;
438
439 ret = regulator_enable(adc->vdd);
440 if (ret)
441 return ret;
442 clk_enable(adc->clk);
443 enable_irq(adc->irq);
444
445 tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
446
447
448 if (cpu == TYPE_ADCV12)
449 tmp |= S3C2416_ADCCON_RESSEL;
450 if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
451 tmp |= S3C64XX_ADCCON_RESSEL;
452
453 writel(tmp, adc->regs + S3C2410_ADCCON);
454
455 return 0;
456}
457
458#else
459#define s3c_adc_suspend NULL
460#define s3c_adc_resume NULL
461#endif
462
463static const struct platform_device_id s3c_adc_driver_ids[] = {
464 {
465 .name = "s3c24xx-adc",
466 .driver_data = TYPE_ADCV1,
467 }, {
468 .name = "s3c2443-adc",
469 .driver_data = TYPE_ADCV11,
470 }, {
471 .name = "s3c2416-adc",
472 .driver_data = TYPE_ADCV12,
473 }, {
474 .name = "s3c64xx-adc",
475 .driver_data = TYPE_ADCV2,
476 }, {
477 .name = "samsung-adc-v3",
478 .driver_data = TYPE_ADCV3,
479 },
480 { }
481};
482MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
483
484static const struct dev_pm_ops adc_pm_ops = {
485 .suspend = s3c_adc_suspend,
486 .resume = s3c_adc_resume,
487};
488
489static struct platform_driver s3c_adc_driver = {
490 .id_table = s3c_adc_driver_ids,
491 .driver = {
492 .name = "s3c-adc",
493 .pm = &adc_pm_ops,
494 },
495 .probe = s3c_adc_probe,
496 .remove = s3c_adc_remove,
497};
498
499static int __init adc_init(void)
500{
501 int ret;
502
503 ret = platform_driver_register(&s3c_adc_driver);
504 if (ret)
505 printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
506
507 return ret;
508}
509
510module_init(adc_init);
511
