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/drivers/mfd/wm8350-core.c

http://github.com/mirrors/linux
C | 440 lines | 318 code | 78 blank | 44 comment | 44 complexity | d720b804a9b7c8c2569c1ea47e591064 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * wm8350-core.c  --  Device access for Wolfson WM8350
  4 *
  5 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
  6 *
  7 * Author: Liam Girdwood, Mark Brown
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/init.h>
 12#include <linux/export.h>
 13#include <linux/slab.h>
 14#include <linux/bug.h>
 15#include <linux/device.h>
 16#include <linux/delay.h>
 17#include <linux/interrupt.h>
 18#include <linux/regmap.h>
 19#include <linux/workqueue.h>
 20
 21#include <linux/mfd/wm8350/core.h>
 22#include <linux/mfd/wm8350/audio.h>
 23#include <linux/mfd/wm8350/comparator.h>
 24#include <linux/mfd/wm8350/gpio.h>
 25#include <linux/mfd/wm8350/pmic.h>
 26#include <linux/mfd/wm8350/rtc.h>
 27#include <linux/mfd/wm8350/supply.h>
 28#include <linux/mfd/wm8350/wdt.h>
 29
 30#define WM8350_CLOCK_CONTROL_1		0x28
 31#define WM8350_AIF_TEST			0x74
 32
 33/* debug */
 34#define WM8350_BUS_DEBUG 0
 35#if WM8350_BUS_DEBUG
 36#define dump(regs, src) do { \
 37	int i_; \
 38	u16 *src_ = src; \
 39	printk(KERN_DEBUG); \
 40	for (i_ = 0; i_ < regs; i_++) \
 41		printk(" 0x%4.4x", *src_++); \
 42	printk("\n"); \
 43} while (0);
 44#else
 45#define dump(bytes, src)
 46#endif
 47
 48#define WM8350_LOCK_DEBUG 0
 49#if WM8350_LOCK_DEBUG
 50#define ldbg(format, arg...) printk(format, ## arg)
 51#else
 52#define ldbg(format, arg...)
 53#endif
 54
 55/*
 56 * WM8350 Device IO
 57 */
 58static DEFINE_MUTEX(reg_lock_mutex);
 59
 60/*
 61 * Safe read, modify, write methods
 62 */
 63int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
 64{
 65	return regmap_update_bits(wm8350->regmap, reg, mask, 0);
 66}
 67EXPORT_SYMBOL_GPL(wm8350_clear_bits);
 68
 69int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
 70{
 71	return regmap_update_bits(wm8350->regmap, reg, mask, mask);
 72}
 73EXPORT_SYMBOL_GPL(wm8350_set_bits);
 74
 75u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
 76{
 77	unsigned int data;
 78	int err;
 79
 80	err = regmap_read(wm8350->regmap, reg, &data);
 81	if (err)
 82		dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
 83
 84	return data;
 85}
 86EXPORT_SYMBOL_GPL(wm8350_reg_read);
 87
 88int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
 89{
 90	int ret;
 91
 92	ret = regmap_write(wm8350->regmap, reg, val);
 93
 94	if (ret)
 95		dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
 96	return ret;
 97}
 98EXPORT_SYMBOL_GPL(wm8350_reg_write);
 99
100int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
101		      u16 *dest)
102{
103	int err = 0;
104
105	err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
106	if (err)
107		dev_err(wm8350->dev, "block read starting from R%d failed\n",
108			start_reg);
109
110	return err;
111}
112EXPORT_SYMBOL_GPL(wm8350_block_read);
113
114int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
115		       u16 *src)
116{
117	int ret = 0;
118
119	ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
120	if (ret)
121		dev_err(wm8350->dev, "block write starting at R%d failed\n",
122			start_reg);
123
124	return ret;
125}
126EXPORT_SYMBOL_GPL(wm8350_block_write);
127
128/**
129 * wm8350_reg_lock()
130 *
131 * The WM8350 has a hardware lock which can be used to prevent writes to
132 * some registers (generally those which can cause particularly serious
133 * problems if misused).  This function enables that lock.
134 */
135int wm8350_reg_lock(struct wm8350 *wm8350)
136{
137	int ret;
138
139	mutex_lock(&reg_lock_mutex);
140
141	ldbg(__func__);
142
143	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
144	if (ret)
145		dev_err(wm8350->dev, "lock failed\n");
146
147	wm8350->unlocked = false;
148
149	mutex_unlock(&reg_lock_mutex);
150
151	return ret;
152}
153EXPORT_SYMBOL_GPL(wm8350_reg_lock);
154
155/**
156 * wm8350_reg_unlock()
157 *
158 * The WM8350 has a hardware lock which can be used to prevent writes to
159 * some registers (generally those which can cause particularly serious
160 * problems if misused).  This function disables that lock so updates
161 * can be performed.  For maximum safety this should be done only when
162 * required.
163 */
164int wm8350_reg_unlock(struct wm8350 *wm8350)
165{
166	int ret;
167
168	mutex_lock(&reg_lock_mutex);
169
170	ldbg(__func__);
171
172	ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
173	if (ret)
174		dev_err(wm8350->dev, "unlock failed\n");
175
176	wm8350->unlocked = true;
177
178	mutex_unlock(&reg_lock_mutex);
179
180	return ret;
181}
182EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
183
184int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
185{
186	u16 reg, result = 0;
187
188	if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
189		return -EINVAL;
190	if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
191	    && (scale != 0 || vref != 0))
192		return -EINVAL;
193
194	mutex_lock(&wm8350->auxadc_mutex);
195
196	/* Turn on the ADC */
197	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
198	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA);
199
200	if (scale || vref) {
201		reg = scale << 13;
202		reg |= vref << 12;
203		wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
204	}
205
206	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
207	reg |= 1 << channel | WM8350_AUXADC_POLL;
208	wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);
209
210	/* If a late IRQ left the completion signalled then consume
211	 * the completion. */
212	try_wait_for_completion(&wm8350->auxadc_done);
213
214	/* We ignore the result of the completion and just check for a
215	 * conversion result, allowing us to soldier on if the IRQ
216	 * infrastructure is not set up for the chip. */
217	wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));
218
219	reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
220	if (reg & WM8350_AUXADC_POLL)
221		dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
222	else
223		result = wm8350_reg_read(wm8350,
224					 WM8350_AUX1_READBACK + channel);
225
226	/* Turn off the ADC */
227	reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
228	wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
229			 reg & ~WM8350_AUXADC_ENA);
230
231	mutex_unlock(&wm8350->auxadc_mutex);
232
233	return result & WM8350_AUXADC_DATA1_MASK;
234}
235EXPORT_SYMBOL_GPL(wm8350_read_auxadc);
236
237static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
238{
239	struct wm8350 *wm8350 = irq_data;
240
241	complete(&wm8350->auxadc_done);
242
243	return IRQ_HANDLED;
244}
245
246/*
247 * Register a client device.  This is non-fatal since there is no need to
248 * fail the entire device init due to a single platform device failing.
249 */
250static void wm8350_client_dev_register(struct wm8350 *wm8350,
251				       const char *name,
252				       struct platform_device **pdev)
253{
254	int ret;
255
256	*pdev = platform_device_alloc(name, -1);
257	if (*pdev == NULL) {
258		dev_err(wm8350->dev, "Failed to allocate %s\n", name);
259		return;
260	}
261
262	(*pdev)->dev.parent = wm8350->dev;
263	platform_set_drvdata(*pdev, wm8350);
264	ret = platform_device_add(*pdev);
265	if (ret != 0) {
266		dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
267		platform_device_put(*pdev);
268		*pdev = NULL;
269	}
270}
271
272int wm8350_device_init(struct wm8350 *wm8350, int irq,
273		       struct wm8350_platform_data *pdata)
274{
275	int ret;
276	unsigned int id1, id2, mask_rev;
277	unsigned int cust_id, mode, chip_rev;
278
279	dev_set_drvdata(wm8350->dev, wm8350);
280
281	/* get WM8350 revision and config mode */
282	ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
283	if (ret != 0) {
284		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
285		goto err;
286	}
287
288	ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
289	if (ret != 0) {
290		dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
291		goto err;
292	}
293
294	ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
295	if (ret != 0) {
296		dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
297		goto err;
298	}
299
300	if (id1 != 0x6143) {
301		dev_err(wm8350->dev,
302			"Device with ID %x is not a WM8350\n", id1);
303		ret = -ENODEV;
304		goto err;
305	}
306
307	mode = (id2 & WM8350_CONF_STS_MASK) >> 10;
308	cust_id = id2 & WM8350_CUST_ID_MASK;
309	chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
310	dev_info(wm8350->dev,
311		 "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
312		 mode, cust_id, mask_rev, chip_rev);
313
314	if (cust_id != 0) {
315		dev_err(wm8350->dev, "Unsupported CUST_ID\n");
316		ret = -ENODEV;
317		goto err;
318	}
319
320	switch (mask_rev) {
321	case 0:
322		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
323		wm8350->pmic.max_isink = WM8350_ISINK_B;
324
325		switch (chip_rev) {
326		case WM8350_REV_E:
327			dev_info(wm8350->dev, "WM8350 Rev E\n");
328			break;
329		case WM8350_REV_F:
330			dev_info(wm8350->dev, "WM8350 Rev F\n");
331			break;
332		case WM8350_REV_G:
333			dev_info(wm8350->dev, "WM8350 Rev G\n");
334			wm8350->power.rev_g_coeff = 1;
335			break;
336		case WM8350_REV_H:
337			dev_info(wm8350->dev, "WM8350 Rev H\n");
338			wm8350->power.rev_g_coeff = 1;
339			break;
340		default:
341			/* For safety we refuse to run on unknown hardware */
342			dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
343			ret = -ENODEV;
344			goto err;
345		}
346		break;
347
348	case 1:
349		wm8350->pmic.max_dcdc = WM8350_DCDC_4;
350		wm8350->pmic.max_isink = WM8350_ISINK_A;
351
352		switch (chip_rev) {
353		case 0:
354			dev_info(wm8350->dev, "WM8351 Rev A\n");
355			wm8350->power.rev_g_coeff = 1;
356			break;
357
358		case 1:
359			dev_info(wm8350->dev, "WM8351 Rev B\n");
360			wm8350->power.rev_g_coeff = 1;
361			break;
362
363		default:
364			dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
365			ret = -ENODEV;
366			goto err;
367		}
368		break;
369
370	case 2:
371		wm8350->pmic.max_dcdc = WM8350_DCDC_6;
372		wm8350->pmic.max_isink = WM8350_ISINK_B;
373
374		switch (chip_rev) {
375		case 0:
376			dev_info(wm8350->dev, "WM8352 Rev A\n");
377			wm8350->power.rev_g_coeff = 1;
378			break;
379
380		default:
381			dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
382			ret = -ENODEV;
383			goto err;
384		}
385		break;
386
387	default:
388		dev_err(wm8350->dev, "Unknown MASK_REV\n");
389		ret = -ENODEV;
390		goto err;
391	}
392
393	mutex_init(&wm8350->auxadc_mutex);
394	init_completion(&wm8350->auxadc_done);
395
396	ret = wm8350_irq_init(wm8350, irq, pdata);
397	if (ret < 0)
398		goto err;
399
400	if (wm8350->irq_base) {
401		ret = request_threaded_irq(wm8350->irq_base +
402					   WM8350_IRQ_AUXADC_DATARDY,
403					   NULL, wm8350_auxadc_irq,
404					   IRQF_ONESHOT,
405					   "auxadc", wm8350);
406		if (ret < 0)
407			dev_warn(wm8350->dev,
408				 "Failed to request AUXADC IRQ: %d\n", ret);
409	}
410
411	if (pdata && pdata->init) {
412		ret = pdata->init(wm8350);
413		if (ret != 0) {
414			dev_err(wm8350->dev, "Platform init() failed: %d\n",
415				ret);
416			goto err_irq;
417		}
418	}
419
420	wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);
421
422	wm8350_client_dev_register(wm8350, "wm8350-codec",
423				   &(wm8350->codec.pdev));
424	wm8350_client_dev_register(wm8350, "wm8350-gpio",
425				   &(wm8350->gpio.pdev));
426	wm8350_client_dev_register(wm8350, "wm8350-hwmon",
427				   &(wm8350->hwmon.pdev));
428	wm8350_client_dev_register(wm8350, "wm8350-power",
429				   &(wm8350->power.pdev));
430	wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
431	wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));
432
433	return 0;
434
435err_irq:
436	wm8350_irq_exit(wm8350);
437err:
438	return ret;
439}
440EXPORT_SYMBOL_GPL(wm8350_device_init);