1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * wm8350-core.c -- Device access for Wolfson WM8350
5 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
7 * Author: Liam Girdwood, Mark Brown
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>
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>
30 #define WM8350_CLOCK_CONTROL_1 0x28
31 #define WM8350_AIF_TEST 0x74
34 #define WM8350_BUS_DEBUG 0
36 #define dump(regs, src) do { \
40 for (i_ = 0; i_ < regs; i_++) \
41 printk(" 0x%4.4x", *src_++); \
45 #define dump(bytes, src)
48 #define WM8350_LOCK_DEBUG 0
50 #define ldbg(format, arg...) printk(format, ## arg)
52 #define ldbg(format, arg...)
58 static DEFINE_MUTEX(reg_lock_mutex);
61 * Safe read, modify, write methods
63 int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
65 return regmap_update_bits(wm8350->regmap, reg, mask, 0);
67 EXPORT_SYMBOL_GPL(wm8350_clear_bits);
69 int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
71 return regmap_update_bits(wm8350->regmap, reg, mask, mask);
73 EXPORT_SYMBOL_GPL(wm8350_set_bits);
75 u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
80 err = regmap_read(wm8350->regmap, reg, &data);
82 dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
86 EXPORT_SYMBOL_GPL(wm8350_reg_read);
88 int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
92 ret = regmap_write(wm8350->regmap, reg, val);
95 dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
98 EXPORT_SYMBOL_GPL(wm8350_reg_write);
100 int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
105 err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
107 dev_err(wm8350->dev, "block read starting from R%d failed\n",
112 EXPORT_SYMBOL_GPL(wm8350_block_read);
114 int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
119 ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
121 dev_err(wm8350->dev, "block write starting at R%d failed\n",
126 EXPORT_SYMBOL_GPL(wm8350_block_write);
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.
135 int wm8350_reg_lock(struct wm8350 *wm8350)
139 mutex_lock(®_lock_mutex);
143 ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
145 dev_err(wm8350->dev, "lock failed\n");
147 wm8350->unlocked = false;
149 mutex_unlock(®_lock_mutex);
153 EXPORT_SYMBOL_GPL(wm8350_reg_lock);
156 * wm8350_reg_unlock()
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
164 int wm8350_reg_unlock(struct wm8350 *wm8350)
168 mutex_lock(®_lock_mutex);
172 ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
174 dev_err(wm8350->dev, "unlock failed\n");
176 wm8350->unlocked = true;
178 mutex_unlock(®_lock_mutex);
182 EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
184 int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
188 if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
190 if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
191 && (scale != 0 || vref != 0))
194 mutex_lock(&wm8350->auxadc_mutex);
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);
203 wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
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);
210 /* If a late IRQ left the completion signalled then consume
212 try_wait_for_completion(&wm8350->auxadc_done);
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));
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);
223 result = wm8350_reg_read(wm8350,
224 WM8350_AUX1_READBACK + channel);
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);
231 mutex_unlock(&wm8350->auxadc_mutex);
233 return result & WM8350_AUXADC_DATA1_MASK;
235 EXPORT_SYMBOL_GPL(wm8350_read_auxadc);
237 static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
239 struct wm8350 *wm8350 = irq_data;
241 complete(&wm8350->auxadc_done);
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.
250 static void wm8350_client_dev_register(struct wm8350 *wm8350,
252 struct platform_device **pdev)
256 *pdev = platform_device_alloc(name, -1);
258 dev_err(wm8350->dev, "Failed to allocate %s\n", name);
262 (*pdev)->dev.parent = wm8350->dev;
263 platform_set_drvdata(*pdev, wm8350);
264 ret = platform_device_add(*pdev);
266 dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
267 platform_device_put(*pdev);
272 int wm8350_device_init(struct wm8350 *wm8350, int irq,
273 struct wm8350_platform_data *pdata)
276 unsigned int id1, id2, mask_rev;
277 unsigned int cust_id, mode, chip_rev;
279 dev_set_drvdata(wm8350->dev, wm8350);
281 /* get WM8350 revision and config mode */
282 ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
284 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
288 ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
290 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
294 ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
296 dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
302 "Device with ID %x is not a WM8350\n", id1);
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);
315 dev_err(wm8350->dev, "Unsupported CUST_ID\n");
322 wm8350->pmic.max_dcdc = WM8350_DCDC_6;
323 wm8350->pmic.max_isink = WM8350_ISINK_B;
327 dev_info(wm8350->dev, "WM8350 Rev E\n");
330 dev_info(wm8350->dev, "WM8350 Rev F\n");
333 dev_info(wm8350->dev, "WM8350 Rev G\n");
334 wm8350->power.rev_g_coeff = 1;
337 dev_info(wm8350->dev, "WM8350 Rev H\n");
338 wm8350->power.rev_g_coeff = 1;
341 /* For safety we refuse to run on unknown hardware */
342 dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
349 wm8350->pmic.max_dcdc = WM8350_DCDC_4;
350 wm8350->pmic.max_isink = WM8350_ISINK_A;
354 dev_info(wm8350->dev, "WM8351 Rev A\n");
355 wm8350->power.rev_g_coeff = 1;
359 dev_info(wm8350->dev, "WM8351 Rev B\n");
360 wm8350->power.rev_g_coeff = 1;
364 dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
371 wm8350->pmic.max_dcdc = WM8350_DCDC_6;
372 wm8350->pmic.max_isink = WM8350_ISINK_B;
376 dev_info(wm8350->dev, "WM8352 Rev A\n");
377 wm8350->power.rev_g_coeff = 1;
381 dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
388 dev_err(wm8350->dev, "Unknown MASK_REV\n");
393 mutex_init(&wm8350->auxadc_mutex);
394 init_completion(&wm8350->auxadc_done);
396 ret = wm8350_irq_init(wm8350, irq, pdata);
400 if (wm8350->irq_base) {
401 ret = request_threaded_irq(wm8350->irq_base +
402 WM8350_IRQ_AUXADC_DATARDY,
403 NULL, wm8350_auxadc_irq,
407 dev_warn(wm8350->dev,
408 "Failed to request AUXADC IRQ: %d\n", ret);
411 if (pdata && pdata->init) {
412 ret = pdata->init(wm8350);
414 dev_err(wm8350->dev, "Platform init() failed: %d\n",
420 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);
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));
436 wm8350_irq_exit(wm8350);
440 EXPORT_SYMBOL_GPL(wm8350_device_init);