2 * wm8994-core.c -- Device access for Wolfson WM8994
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/i2c.h>
19 #include <linux/err.h>
20 #include <linux/delay.h>
21 #include <linux/mfd/core.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/regmap.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/regulator/machine.h>
27 #include <linux/mfd/wm8994/core.h>
28 #include <linux/mfd/wm8994/pdata.h>
29 #include <linux/mfd/wm8994/registers.h>
31 static int wm8994_read(struct wm8994
*wm8994
, unsigned short reg
,
32 int bytes
, void *dest
)
34 return regmap_raw_read(wm8994
->regmap
, reg
, dest
, bytes
);
38 * wm8994_reg_read: Read a single WM8994 register.
40 * @wm8994: Device to read from.
41 * @reg: Register to read.
43 int wm8994_reg_read(struct wm8994
*wm8994
, unsigned short reg
)
48 ret
= regmap_read(wm8994
->regmap
, reg
, &val
);
55 EXPORT_SYMBOL_GPL(wm8994_reg_read
);
58 * wm8994_bulk_read: Read multiple WM8994 registers
60 * @wm8994: Device to read from
61 * @reg: First register
62 * @count: Number of registers
63 * @buf: Buffer to fill. The data will be returned big endian.
65 int wm8994_bulk_read(struct wm8994
*wm8994
, unsigned short reg
,
68 return regmap_bulk_read(wm8994
->regmap
, reg
, buf
, count
);
71 static int wm8994_write(struct wm8994
*wm8994
, unsigned short reg
,
72 int bytes
, const void *src
)
74 return regmap_raw_write(wm8994
->regmap
, reg
, src
, bytes
);
78 * wm8994_reg_write: Write a single WM8994 register.
80 * @wm8994: Device to write to.
81 * @reg: Register to write to.
82 * @val: Value to write.
84 int wm8994_reg_write(struct wm8994
*wm8994
, unsigned short reg
,
87 return regmap_write(wm8994
->regmap
, reg
, val
);
89 EXPORT_SYMBOL_GPL(wm8994_reg_write
);
92 * wm8994_bulk_write: Write multiple WM8994 registers
94 * @wm8994: Device to write to
95 * @reg: First register
96 * @count: Number of registers
97 * @buf: Buffer to write from. Data must be big-endian formatted.
99 int wm8994_bulk_write(struct wm8994
*wm8994
, unsigned short reg
,
100 int count
, const u16
*buf
)
102 return regmap_raw_write(wm8994
->regmap
, reg
, buf
, count
* sizeof(u16
));
104 EXPORT_SYMBOL_GPL(wm8994_bulk_write
);
107 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
109 * @wm8994: Device to write to.
110 * @reg: Register to write to.
111 * @mask: Mask of bits to set.
112 * @val: Value to set (unshifted)
114 int wm8994_set_bits(struct wm8994
*wm8994
, unsigned short reg
,
115 unsigned short mask
, unsigned short val
)
117 return regmap_update_bits(wm8994
->regmap
, reg
, mask
, val
);
119 EXPORT_SYMBOL_GPL(wm8994_set_bits
);
121 static struct mfd_cell wm8994_regulator_devs
[] = {
123 .name
= "wm8994-ldo",
125 .pm_runtime_no_callbacks
= true,
128 .name
= "wm8994-ldo",
130 .pm_runtime_no_callbacks
= true,
134 static struct resource wm8994_codec_resources
[] = {
136 .start
= WM8994_IRQ_TEMP_SHUT
,
137 .end
= WM8994_IRQ_TEMP_WARN
,
138 .flags
= IORESOURCE_IRQ
,
142 static struct resource wm8994_gpio_resources
[] = {
144 .start
= WM8994_IRQ_GPIO(1),
145 .end
= WM8994_IRQ_GPIO(11),
146 .flags
= IORESOURCE_IRQ
,
150 static struct mfd_cell wm8994_devs
[] = {
152 .name
= "wm8994-codec",
153 .num_resources
= ARRAY_SIZE(wm8994_codec_resources
),
154 .resources
= wm8994_codec_resources
,
158 .name
= "wm8994-gpio",
159 .num_resources
= ARRAY_SIZE(wm8994_gpio_resources
),
160 .resources
= wm8994_gpio_resources
,
161 .pm_runtime_no_callbacks
= true,
166 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
167 * and should be handled via the standard regulator API supply
170 static const char *wm1811_main_supplies
[] = {
182 static const char *wm8994_main_supplies
[] = {
192 static const char *wm8958_main_supplies
[] = {
205 static int wm8994_suspend(struct device
*dev
)
207 struct wm8994
*wm8994
= dev_get_drvdata(dev
);
210 /* Don't actually go through with the suspend if the CODEC is
211 * still active (eg, for audio passthrough from CP. */
212 ret
= wm8994_reg_read(wm8994
, WM8994_POWER_MANAGEMENT_1
);
214 dev_err(dev
, "Failed to read power status: %d\n", ret
);
215 } else if (ret
& WM8994_VMID_SEL_MASK
) {
216 dev_dbg(dev
, "CODEC still active, ignoring suspend\n");
220 /* GPIO configuration state is saved here since we may be configuring
221 * the GPIO alternate functions even if we're not using the gpiolib
224 ret
= wm8994_read(wm8994
, WM8994_GPIO_1
, WM8994_NUM_GPIO_REGS
* 2,
227 dev_err(dev
, "Failed to save GPIO registers: %d\n", ret
);
229 /* For similar reasons we also stash the regulator states */
230 ret
= wm8994_read(wm8994
, WM8994_LDO_1
, WM8994_NUM_LDO_REGS
* 2,
233 dev_err(dev
, "Failed to save LDO registers: %d\n", ret
);
235 /* Explicitly put the device into reset in case regulators
236 * don't get disabled in order to ensure consistent restart.
238 wm8994_reg_write(wm8994
, WM8994_SOFTWARE_RESET
, 0x8994);
240 wm8994
->suspended
= true;
242 ret
= regulator_bulk_disable(wm8994
->num_supplies
,
245 dev_err(dev
, "Failed to disable supplies: %d\n", ret
);
252 static int wm8994_resume(struct device
*dev
)
254 struct wm8994
*wm8994
= dev_get_drvdata(dev
);
257 /* We may have lied to the PM core about suspending */
258 if (!wm8994
->suspended
)
261 ret
= regulator_bulk_enable(wm8994
->num_supplies
,
264 dev_err(dev
, "Failed to enable supplies: %d\n", ret
);
268 /* Write register at a time as we use the cache on the CPU so store
269 * it in native endian.
271 for (i
= 0; i
< ARRAY_SIZE(wm8994
->irq_masks_cur
); i
++) {
272 ret
= wm8994_reg_write(wm8994
, WM8994_INTERRUPT_STATUS_1_MASK
273 + i
, wm8994
->irq_masks_cur
[i
]);
275 dev_err(dev
, "Failed to restore interrupt masks: %d\n",
279 ret
= wm8994_write(wm8994
, WM8994_LDO_1
, WM8994_NUM_LDO_REGS
* 2,
282 dev_err(dev
, "Failed to restore LDO registers: %d\n", ret
);
284 ret
= wm8994_write(wm8994
, WM8994_GPIO_1
, WM8994_NUM_GPIO_REGS
* 2,
287 dev_err(dev
, "Failed to restore GPIO registers: %d\n", ret
);
289 wm8994
->suspended
= false;
295 #ifdef CONFIG_REGULATOR
296 static int wm8994_ldo_in_use(struct wm8994_pdata
*pdata
, int ldo
)
298 struct wm8994_ldo_pdata
*ldo_pdata
;
303 ldo_pdata
= &pdata
->ldo
[ldo
];
305 if (!ldo_pdata
->init_data
)
308 return ldo_pdata
->init_data
->num_consumer_supplies
!= 0;
311 static int wm8994_ldo_in_use(struct wm8994_pdata
*pdata
, int ldo
)
317 static struct regmap_config wm8994_regmap_config
= {
323 * Instantiate the generic non-control parts of the device.
325 static int wm8994_device_init(struct wm8994
*wm8994
, int irq
)
327 struct wm8994_pdata
*pdata
= wm8994
->dev
->platform_data
;
331 dev_set_drvdata(wm8994
->dev
, wm8994
);
333 /* Add the on-chip regulators first for bootstrapping */
334 ret
= mfd_add_devices(wm8994
->dev
, -1,
335 wm8994_regulator_devs
,
336 ARRAY_SIZE(wm8994_regulator_devs
),
339 dev_err(wm8994
->dev
, "Failed to add children: %d\n", ret
);
343 switch (wm8994
->type
) {
345 wm8994
->num_supplies
= ARRAY_SIZE(wm1811_main_supplies
);
348 wm8994
->num_supplies
= ARRAY_SIZE(wm8994_main_supplies
);
351 wm8994
->num_supplies
= ARRAY_SIZE(wm8958_main_supplies
);
358 wm8994
->supplies
= kzalloc(sizeof(struct regulator_bulk_data
) *
359 wm8994
->num_supplies
,
361 if (!wm8994
->supplies
) {
366 switch (wm8994
->type
) {
368 for (i
= 0; i
< ARRAY_SIZE(wm1811_main_supplies
); i
++)
369 wm8994
->supplies
[i
].supply
= wm1811_main_supplies
[i
];
372 for (i
= 0; i
< ARRAY_SIZE(wm8994_main_supplies
); i
++)
373 wm8994
->supplies
[i
].supply
= wm8994_main_supplies
[i
];
376 for (i
= 0; i
< ARRAY_SIZE(wm8958_main_supplies
); i
++)
377 wm8994
->supplies
[i
].supply
= wm8958_main_supplies
[i
];
384 ret
= regulator_bulk_get(wm8994
->dev
, wm8994
->num_supplies
,
387 dev_err(wm8994
->dev
, "Failed to get supplies: %d\n", ret
);
391 ret
= regulator_bulk_enable(wm8994
->num_supplies
,
394 dev_err(wm8994
->dev
, "Failed to enable supplies: %d\n", ret
);
398 ret
= wm8994_reg_read(wm8994
, WM8994_SOFTWARE_RESET
);
400 dev_err(wm8994
->dev
, "Failed to read ID register\n");
406 if (wm8994
->type
!= WM1811
)
407 dev_warn(wm8994
->dev
, "Device registered as type %d\n",
409 wm8994
->type
= WM1811
;
413 if (wm8994
->type
!= WM8994
)
414 dev_warn(wm8994
->dev
, "Device registered as type %d\n",
416 wm8994
->type
= WM8994
;
420 if (wm8994
->type
!= WM8958
)
421 dev_warn(wm8994
->dev
, "Device registered as type %d\n",
423 wm8994
->type
= WM8958
;
426 dev_err(wm8994
->dev
, "Device is not a WM8994, ID is %x\n",
432 ret
= wm8994_reg_read(wm8994
, WM8994_CHIP_REVISION
);
434 dev_err(wm8994
->dev
, "Failed to read revision register: %d\n",
439 switch (wm8994
->type
) {
444 dev_warn(wm8994
->dev
,
445 "revision %c not fully supported\n",
456 dev_info(wm8994
->dev
, "%s revision %c\n", devname
, 'A' + ret
);
459 wm8994
->irq_base
= pdata
->irq_base
;
460 wm8994
->gpio_base
= pdata
->gpio_base
;
462 /* GPIO configuration is only applied if it's non-zero */
463 for (i
= 0; i
< ARRAY_SIZE(pdata
->gpio_defaults
); i
++) {
464 if (pdata
->gpio_defaults
[i
]) {
465 wm8994_set_bits(wm8994
, WM8994_GPIO_1
+ i
,
467 pdata
->gpio_defaults
[i
]);
472 /* In some system designs where the regulators are not in use,
473 * we can achieve a small reduction in leakage currents by
474 * floating LDO outputs. This bit makes no difference if the
475 * LDOs are enabled, it only affects cases where the LDOs were
476 * in operation and are then disabled.
478 for (i
= 0; i
< WM8994_NUM_LDO_REGS
; i
++) {
479 if (wm8994_ldo_in_use(pdata
, i
))
480 wm8994_set_bits(wm8994
, WM8994_LDO_1
+ i
,
481 WM8994_LDO1_DISCH
, WM8994_LDO1_DISCH
);
483 wm8994_set_bits(wm8994
, WM8994_LDO_1
+ i
,
484 WM8994_LDO1_DISCH
, 0);
487 wm8994_irq_init(wm8994
);
489 ret
= mfd_add_devices(wm8994
->dev
, -1,
490 wm8994_devs
, ARRAY_SIZE(wm8994_devs
),
493 dev_err(wm8994
->dev
, "Failed to add children: %d\n", ret
);
497 pm_runtime_enable(wm8994
->dev
);
498 pm_runtime_resume(wm8994
->dev
);
503 wm8994_irq_exit(wm8994
);
505 regulator_bulk_disable(wm8994
->num_supplies
,
508 regulator_bulk_free(wm8994
->num_supplies
, wm8994
->supplies
);
510 kfree(wm8994
->supplies
);
512 regmap_exit(wm8994
->regmap
);
513 mfd_remove_devices(wm8994
->dev
);
518 static void wm8994_device_exit(struct wm8994
*wm8994
)
520 pm_runtime_disable(wm8994
->dev
);
521 mfd_remove_devices(wm8994
->dev
);
522 wm8994_irq_exit(wm8994
);
523 regulator_bulk_disable(wm8994
->num_supplies
,
525 regulator_bulk_free(wm8994
->num_supplies
, wm8994
->supplies
);
526 kfree(wm8994
->supplies
);
527 regmap_exit(wm8994
->regmap
);
531 static int wm8994_i2c_probe(struct i2c_client
*i2c
,
532 const struct i2c_device_id
*id
)
534 struct wm8994
*wm8994
;
537 wm8994
= kzalloc(sizeof(struct wm8994
), GFP_KERNEL
);
541 i2c_set_clientdata(i2c
, wm8994
);
542 wm8994
->dev
= &i2c
->dev
;
543 wm8994
->irq
= i2c
->irq
;
544 wm8994
->type
= id
->driver_data
;
546 wm8994
->regmap
= regmap_init_i2c(i2c
, &wm8994_regmap_config
);
547 if (IS_ERR(wm8994
->regmap
)) {
548 ret
= PTR_ERR(wm8994
->regmap
);
549 dev_err(wm8994
->dev
, "Failed to allocate register map: %d\n",
555 return wm8994_device_init(wm8994
, i2c
->irq
);
558 static int wm8994_i2c_remove(struct i2c_client
*i2c
)
560 struct wm8994
*wm8994
= i2c_get_clientdata(i2c
);
562 wm8994_device_exit(wm8994
);
567 static const struct i2c_device_id wm8994_i2c_id
[] = {
568 { "wm1811", WM1811
},
569 { "wm8994", WM8994
},
570 { "wm8958", WM8958
},
573 MODULE_DEVICE_TABLE(i2c
, wm8994_i2c_id
);
575 static UNIVERSAL_DEV_PM_OPS(wm8994_pm_ops
, wm8994_suspend
, wm8994_resume
,
578 static struct i2c_driver wm8994_i2c_driver
= {
581 .owner
= THIS_MODULE
,
582 .pm
= &wm8994_pm_ops
,
584 .probe
= wm8994_i2c_probe
,
585 .remove
= wm8994_i2c_remove
,
586 .id_table
= wm8994_i2c_id
,
589 static int __init
wm8994_i2c_init(void)
593 ret
= i2c_add_driver(&wm8994_i2c_driver
);
595 pr_err("Failed to register wm8994 I2C driver: %d\n", ret
);
599 module_init(wm8994_i2c_init
);
601 static void __exit
wm8994_i2c_exit(void)
603 i2c_del_driver(&wm8994_i2c_driver
);
605 module_exit(wm8994_i2c_exit
);
607 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
608 MODULE_LICENSE("GPL");
609 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");