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Linux/drivers/mfd/mc13xxx-core.c

  1 /*
  2  * Copyright 2009-2010 Pengutronix
  3  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
  4  *
  5  * loosely based on an earlier driver that has
  6  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
  7  *
  8  * This program is free software; you can redistribute it and/or modify it under
  9  * the terms of the GNU General Public License version 2 as published by the
 10  * Free Software Foundation.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/of.h>
 15 #include <linux/of_device.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/mfd/core.h>
 18 
 19 #include "mc13xxx.h"
 20 
 21 #define MC13XXX_IRQSTAT0        0
 22 #define MC13XXX_IRQMASK0        1
 23 #define MC13XXX_IRQSTAT1        3
 24 #define MC13XXX_IRQMASK1        4
 25 
 26 #define MC13XXX_REVISION        7
 27 #define MC13XXX_REVISION_REVMETAL       (0x07 <<  0)
 28 #define MC13XXX_REVISION_REVFULL        (0x03 <<  3)
 29 #define MC13XXX_REVISION_ICID           (0x07 <<  6)
 30 #define MC13XXX_REVISION_FIN            (0x03 <<  9)
 31 #define MC13XXX_REVISION_FAB            (0x03 << 11)
 32 #define MC13XXX_REVISION_ICIDCODE       (0x3f << 13)
 33 
 34 #define MC34708_REVISION_REVMETAL       (0x07 <<  0)
 35 #define MC34708_REVISION_REVFULL        (0x07 <<  3)
 36 #define MC34708_REVISION_FIN            (0x07 <<  6)
 37 #define MC34708_REVISION_FAB            (0x07 <<  9)
 38 
 39 #define MC13XXX_ADC1            44
 40 #define MC13XXX_ADC1_ADEN               (1 << 0)
 41 #define MC13XXX_ADC1_RAND               (1 << 1)
 42 #define MC13XXX_ADC1_ADSEL              (1 << 3)
 43 #define MC13XXX_ADC1_ASC                (1 << 20)
 44 #define MC13XXX_ADC1_ADTRIGIGN          (1 << 21)
 45 
 46 #define MC13XXX_ADC2            45
 47 
 48 void mc13xxx_lock(struct mc13xxx *mc13xxx)
 49 {
 50         if (!mutex_trylock(&mc13xxx->lock)) {
 51                 dev_dbg(mc13xxx->dev, "wait for %s from %pf\n",
 52                                 __func__, __builtin_return_address(0));
 53 
 54                 mutex_lock(&mc13xxx->lock);
 55         }
 56         dev_dbg(mc13xxx->dev, "%s from %pf\n",
 57                         __func__, __builtin_return_address(0));
 58 }
 59 EXPORT_SYMBOL(mc13xxx_lock);
 60 
 61 void mc13xxx_unlock(struct mc13xxx *mc13xxx)
 62 {
 63         dev_dbg(mc13xxx->dev, "%s from %pf\n",
 64                         __func__, __builtin_return_address(0));
 65         mutex_unlock(&mc13xxx->lock);
 66 }
 67 EXPORT_SYMBOL(mc13xxx_unlock);
 68 
 69 int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
 70 {
 71         int ret;
 72 
 73         ret = regmap_read(mc13xxx->regmap, offset, val);
 74         dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val);
 75 
 76         return ret;
 77 }
 78 EXPORT_SYMBOL(mc13xxx_reg_read);
 79 
 80 int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
 81 {
 82         dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val);
 83 
 84         if (val >= BIT(24))
 85                 return -EINVAL;
 86 
 87         return regmap_write(mc13xxx->regmap, offset, val);
 88 }
 89 EXPORT_SYMBOL(mc13xxx_reg_write);
 90 
 91 int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
 92                 u32 mask, u32 val)
 93 {
 94         BUG_ON(val & ~mask);
 95         dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n",
 96                         offset, val, mask);
 97 
 98         return regmap_update_bits(mc13xxx->regmap, offset, mask, val);
 99 }
100 EXPORT_SYMBOL(mc13xxx_reg_rmw);
101 
102 int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq)
103 {
104         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
105 
106         disable_irq_nosync(virq);
107 
108         return 0;
109 }
110 EXPORT_SYMBOL(mc13xxx_irq_mask);
111 
112 int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq)
113 {
114         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
115 
116         enable_irq(virq);
117 
118         return 0;
119 }
120 EXPORT_SYMBOL(mc13xxx_irq_unmask);
121 
122 int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq,
123                 int *enabled, int *pending)
124 {
125         int ret;
126         unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
127         unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
128         u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
129 
130         if (irq < 0 || irq >= ARRAY_SIZE(mc13xxx->irqs))
131                 return -EINVAL;
132 
133         if (enabled) {
134                 u32 mask;
135 
136                 ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
137                 if (ret)
138                         return ret;
139 
140                 *enabled = mask & irqbit;
141         }
142 
143         if (pending) {
144                 u32 stat;
145 
146                 ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
147                 if (ret)
148                         return ret;
149 
150                 *pending = stat & irqbit;
151         }
152 
153         return 0;
154 }
155 EXPORT_SYMBOL(mc13xxx_irq_status);
156 
157 int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq,
158                 irq_handler_t handler, const char *name, void *dev)
159 {
160         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
161 
162         return devm_request_threaded_irq(mc13xxx->dev, virq, NULL, handler,
163                                          0, name, dev);
164 }
165 EXPORT_SYMBOL(mc13xxx_irq_request);
166 
167 int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev)
168 {
169         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
170 
171         devm_free_irq(mc13xxx->dev, virq, dev);
172 
173         return 0;
174 }
175 EXPORT_SYMBOL(mc13xxx_irq_free);
176 
177 #define maskval(reg, mask)      (((reg) & (mask)) >> __ffs(mask))
178 static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision)
179 {
180         dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
181                         "fin: %d, fab: %d, icid: %d/%d\n",
182                         mc13xxx->variant->name,
183                         maskval(revision, MC13XXX_REVISION_REVFULL),
184                         maskval(revision, MC13XXX_REVISION_REVMETAL),
185                         maskval(revision, MC13XXX_REVISION_FIN),
186                         maskval(revision, MC13XXX_REVISION_FAB),
187                         maskval(revision, MC13XXX_REVISION_ICID),
188                         maskval(revision, MC13XXX_REVISION_ICIDCODE));
189 }
190 
191 static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision)
192 {
193         dev_info(mc13xxx->dev, "%s: rev %d.%d, fin: %d, fab: %d\n",
194                         mc13xxx->variant->name,
195                         maskval(revision, MC34708_REVISION_REVFULL),
196                         maskval(revision, MC34708_REVISION_REVMETAL),
197                         maskval(revision, MC34708_REVISION_FIN),
198                         maskval(revision, MC34708_REVISION_FAB));
199 }
200 
201 /* These are only exported for mc13xxx-i2c and mc13xxx-spi */
202 struct mc13xxx_variant mc13xxx_variant_mc13783 = {
203         .name = "mc13783",
204         .print_revision = mc13xxx_print_revision,
205 };
206 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);
207 
208 struct mc13xxx_variant mc13xxx_variant_mc13892 = {
209         .name = "mc13892",
210         .print_revision = mc13xxx_print_revision,
211 };
212 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);
213 
214 struct mc13xxx_variant mc13xxx_variant_mc34708 = {
215         .name = "mc34708",
216         .print_revision = mc34708_print_revision,
217 };
218 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708);
219 
220 static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
221 {
222         return mc13xxx->variant->name;
223 }
224 
225 int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
226 {
227         return mc13xxx->flags;
228 }
229 EXPORT_SYMBOL(mc13xxx_get_flags);
230 
231 #define MC13XXX_ADC1_CHAN0_SHIFT        5
232 #define MC13XXX_ADC1_CHAN1_SHIFT        8
233 #define MC13783_ADC1_ATO_SHIFT          11
234 #define MC13783_ADC1_ATOX               (1 << 19)
235 
236 struct mc13xxx_adcdone_data {
237         struct mc13xxx *mc13xxx;
238         struct completion done;
239 };
240 
241 static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
242 {
243         struct mc13xxx_adcdone_data *adcdone_data = data;
244 
245         complete_all(&adcdone_data->done);
246 
247         return IRQ_HANDLED;
248 }
249 
250 #define MC13XXX_ADC_WORKING (1 << 0)
251 
252 int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
253                 unsigned int channel, u8 ato, bool atox,
254                 unsigned int *sample)
255 {
256         u32 adc0, adc1, old_adc0;
257         int i, ret;
258         struct mc13xxx_adcdone_data adcdone_data = {
259                 .mc13xxx = mc13xxx,
260         };
261         init_completion(&adcdone_data.done);
262 
263         dev_dbg(mc13xxx->dev, "%s\n", __func__);
264 
265         mc13xxx_lock(mc13xxx);
266 
267         if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
268                 ret = -EBUSY;
269                 goto out;
270         }
271 
272         mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
273 
274         mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
275 
276         adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2;
277         adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
278 
279         if (channel > 7)
280                 adc1 |= MC13XXX_ADC1_ADSEL;
281 
282         switch (mode) {
283         case MC13XXX_ADC_MODE_TS:
284                 adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 |
285                         MC13XXX_ADC0_TSMOD1;
286                 adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
287                 break;
288 
289         case MC13XXX_ADC_MODE_SINGLE_CHAN:
290                 adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
291                 adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
292                 adc1 |= MC13XXX_ADC1_RAND;
293                 break;
294 
295         case MC13XXX_ADC_MODE_MULT_CHAN:
296                 adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
297                 adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
298                 break;
299 
300         default:
301                 mc13xxx_unlock(mc13xxx);
302                 return -EINVAL;
303         }
304 
305         adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
306         if (atox)
307                 adc1 |= MC13783_ADC1_ATOX;
308 
309         dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__);
310         mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
311                         mc13xxx_handler_adcdone, __func__, &adcdone_data);
312 
313         mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
314         mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);
315 
316         mc13xxx_unlock(mc13xxx);
317 
318         ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);
319 
320         if (!ret)
321                 ret = -ETIMEDOUT;
322 
323         mc13xxx_lock(mc13xxx);
324 
325         mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data);
326 
327         if (ret > 0)
328                 for (i = 0; i < 4; ++i) {
329                         ret = mc13xxx_reg_read(mc13xxx,
330                                         MC13XXX_ADC2, &sample[i]);
331                         if (ret)
332                                 break;
333                 }
334 
335         if (mode == MC13XXX_ADC_MODE_TS)
336                 /* restore TSMOD */
337                 mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);
338 
339         mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
340 out:
341         mc13xxx_unlock(mc13xxx);
342 
343         return ret;
344 }
345 EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);
346 
347 static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
348                 const char *format, void *pdata, size_t pdata_size)
349 {
350         char buf[30];
351         const char *name = mc13xxx_get_chipname(mc13xxx);
352 
353         struct mfd_cell cell = {
354                 .platform_data = pdata,
355                 .pdata_size = pdata_size,
356         };
357 
358         /* there is no asnprintf in the kernel :-( */
359         if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
360                 return -E2BIG;
361 
362         cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
363         if (!cell.name)
364                 return -ENOMEM;
365 
366         return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0,
367                                regmap_irq_get_domain(mc13xxx->irq_data));
368 }
369 
370 static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
371 {
372         return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
373 }
374 
375 #ifdef CONFIG_OF
376 static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
377 {
378         struct device_node *np = mc13xxx->dev->of_node;
379 
380         if (!np)
381                 return -ENODEV;
382 
383         if (of_get_property(np, "fsl,mc13xxx-uses-adc", NULL))
384                 mc13xxx->flags |= MC13XXX_USE_ADC;
385 
386         if (of_get_property(np, "fsl,mc13xxx-uses-codec", NULL))
387                 mc13xxx->flags |= MC13XXX_USE_CODEC;
388 
389         if (of_get_property(np, "fsl,mc13xxx-uses-rtc", NULL))
390                 mc13xxx->flags |= MC13XXX_USE_RTC;
391 
392         if (of_get_property(np, "fsl,mc13xxx-uses-touch", NULL))
393                 mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;
394 
395         return 0;
396 }
397 #else
398 static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
399 {
400         return -ENODEV;
401 }
402 #endif
403 
404 int mc13xxx_common_init(struct device *dev)
405 {
406         struct mc13xxx_platform_data *pdata = dev_get_platdata(dev);
407         struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
408         u32 revision;
409         int i, ret;
410 
411         mc13xxx->dev = dev;
412 
413         ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
414         if (ret)
415                 return ret;
416 
417         mc13xxx->variant->print_revision(mc13xxx, revision);
418 
419         for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) {
420                 mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG;
421                 mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG);
422         }
423 
424         mc13xxx->irq_chip.name = dev_name(dev);
425         mc13xxx->irq_chip.status_base = MC13XXX_IRQSTAT0;
426         mc13xxx->irq_chip.mask_base = MC13XXX_IRQMASK0;
427         mc13xxx->irq_chip.ack_base = MC13XXX_IRQSTAT0;
428         mc13xxx->irq_chip.irq_reg_stride = MC13XXX_IRQSTAT1 - MC13XXX_IRQSTAT0;
429         mc13xxx->irq_chip.init_ack_masked = true;
430         mc13xxx->irq_chip.use_ack = true;
431         mc13xxx->irq_chip.num_regs = MC13XXX_IRQ_REG_CNT;
432         mc13xxx->irq_chip.irqs = mc13xxx->irqs;
433         mc13xxx->irq_chip.num_irqs = ARRAY_SIZE(mc13xxx->irqs);
434 
435         ret = regmap_add_irq_chip(mc13xxx->regmap, mc13xxx->irq, IRQF_ONESHOT,
436                                   0, &mc13xxx->irq_chip, &mc13xxx->irq_data);
437         if (ret)
438                 return ret;
439 
440         mutex_init(&mc13xxx->lock);
441 
442         if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
443                 mc13xxx->flags = pdata->flags;
444 
445         if (pdata) {
446                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
447                         &pdata->regulators, sizeof(pdata->regulators));
448                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
449                                 pdata->leds, sizeof(*pdata->leds));
450                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
451                                 pdata->buttons, sizeof(*pdata->buttons));
452                 if (mc13xxx->flags & MC13XXX_USE_CODEC)
453                         mc13xxx_add_subdevice_pdata(mc13xxx, "%s-codec",
454                                 pdata->codec, sizeof(*pdata->codec));
455                 if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
456                         mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
457                                 &pdata->touch, sizeof(pdata->touch));
458         } else {
459                 mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
460                 mc13xxx_add_subdevice(mc13xxx, "%s-led");
461                 mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
462                 if (mc13xxx->flags & MC13XXX_USE_CODEC)
463                         mc13xxx_add_subdevice(mc13xxx, "%s-codec");
464                 if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
465                         mc13xxx_add_subdevice(mc13xxx, "%s-ts");
466         }
467 
468         if (mc13xxx->flags & MC13XXX_USE_ADC)
469                 mc13xxx_add_subdevice(mc13xxx, "%s-adc");
470 
471         if (mc13xxx->flags & MC13XXX_USE_RTC)
472                 mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
473 
474         return 0;
475 }
476 EXPORT_SYMBOL_GPL(mc13xxx_common_init);
477 
478 int mc13xxx_common_exit(struct device *dev)
479 {
480         struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
481 
482         mfd_remove_devices(dev);
483         regmap_del_irq_chip(mc13xxx->irq, mc13xxx->irq_data);
484         mutex_destroy(&mc13xxx->lock);
485 
486         return 0;
487 }
488 EXPORT_SYMBOL_GPL(mc13xxx_common_exit);
489 
490 MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
491 MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
492 MODULE_LICENSE("GPL v2");
493 

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