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/delay.h>
20 #include <linux/mfd/core.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/regulator/machine.h>
24 #include <linux/mfd/wm8994/core.h>
25 #include <linux/mfd/wm8994/pdata.h>
26 #include <linux/mfd/wm8994/registers.h>
28 static int wm8994_read(struct wm8994
*wm8994
, unsigned short reg
,
29 int bytes
, void *dest
)
37 ret
= wm8994
->read_dev(wm8994
, reg
, bytes
, dest
);
41 for (i
= 0; i
< bytes
/ 2; i
++) {
42 buf
[i
] = be16_to_cpu(buf
[i
]);
44 dev_vdbg(wm8994
->dev
, "Read %04x from R%d(0x%x)\n",
45 buf
[i
], reg
+ i
, reg
+ i
);
52 * wm8994_reg_read: Read a single WM8994 register.
54 * @wm8994: Device to read from.
55 * @reg: Register to read.
57 int wm8994_reg_read(struct wm8994
*wm8994
, unsigned short reg
)
62 mutex_lock(&wm8994
->io_lock
);
64 ret
= wm8994_read(wm8994
, reg
, 2, &val
);
66 mutex_unlock(&wm8994
->io_lock
);
73 EXPORT_SYMBOL_GPL(wm8994_reg_read
);
76 * wm8994_bulk_read: Read multiple WM8994 registers
78 * @wm8994: Device to read from
79 * @reg: First register
80 * @count: Number of registers
81 * @buf: Buffer to fill.
83 int wm8994_bulk_read(struct wm8994
*wm8994
, unsigned short reg
,
88 mutex_lock(&wm8994
->io_lock
);
90 ret
= wm8994_read(wm8994
, reg
, count
* 2, buf
);
92 mutex_unlock(&wm8994
->io_lock
);
96 EXPORT_SYMBOL_GPL(wm8994_bulk_read
);
98 static int wm8994_write(struct wm8994
*wm8994
, unsigned short reg
,
107 for (i
= 0; i
< bytes
/ 2; i
++) {
108 dev_vdbg(wm8994
->dev
, "Write %04x to R%d(0x%x)\n",
109 buf
[i
], reg
+ i
, reg
+ i
);
111 buf
[i
] = cpu_to_be16(buf
[i
]);
114 return wm8994
->write_dev(wm8994
, reg
, bytes
, src
);
118 * wm8994_reg_write: Write a single WM8994 register.
120 * @wm8994: Device to write to.
121 * @reg: Register to write to.
122 * @val: Value to write.
124 int wm8994_reg_write(struct wm8994
*wm8994
, unsigned short reg
,
129 mutex_lock(&wm8994
->io_lock
);
131 ret
= wm8994_write(wm8994
, reg
, 2, &val
);
133 mutex_unlock(&wm8994
->io_lock
);
137 EXPORT_SYMBOL_GPL(wm8994_reg_write
);
140 * wm8994_set_bits: Set the value of a bitfield in a WM8994 register
142 * @wm8994: Device to write to.
143 * @reg: Register to write to.
144 * @mask: Mask of bits to set.
145 * @val: Value to set (unshifted)
147 int wm8994_set_bits(struct wm8994
*wm8994
, unsigned short reg
,
148 unsigned short mask
, unsigned short val
)
153 mutex_lock(&wm8994
->io_lock
);
155 ret
= wm8994_read(wm8994
, reg
, 2, &r
);
162 ret
= wm8994_write(wm8994
, reg
, 2, &r
);
165 mutex_unlock(&wm8994
->io_lock
);
169 EXPORT_SYMBOL_GPL(wm8994_set_bits
);
171 static struct mfd_cell wm8994_regulator_devs
[] = {
172 { .name
= "wm8994-ldo", .id
= 1 },
173 { .name
= "wm8994-ldo", .id
= 2 },
176 static struct resource wm8994_codec_resources
[] = {
178 .start
= WM8994_IRQ_TEMP_SHUT
,
179 .end
= WM8994_IRQ_TEMP_WARN
,
180 .flags
= IORESOURCE_IRQ
,
184 static struct resource wm8994_gpio_resources
[] = {
186 .start
= WM8994_IRQ_GPIO(1),
187 .end
= WM8994_IRQ_GPIO(11),
188 .flags
= IORESOURCE_IRQ
,
192 static struct mfd_cell wm8994_devs
[] = {
194 .name
= "wm8994-codec",
195 .num_resources
= ARRAY_SIZE(wm8994_codec_resources
),
196 .resources
= wm8994_codec_resources
,
200 .name
= "wm8994-gpio",
201 .num_resources
= ARRAY_SIZE(wm8994_gpio_resources
),
202 .resources
= wm8994_gpio_resources
,
207 * Supplies for the main bulk of CODEC; the LDO supplies are ignored
208 * and should be handled via the standard regulator API supply
211 static const char *wm8994_main_supplies
[] = {
221 static const char *wm8958_main_supplies
[] = {
234 static int wm8994_device_suspend(struct device
*dev
)
236 struct wm8994
*wm8994
= dev_get_drvdata(dev
);
239 /* GPIO configuration state is saved here since we may be configuring
240 * the GPIO alternate functions even if we're not using the gpiolib
243 ret
= wm8994_read(wm8994
, WM8994_GPIO_1
, WM8994_NUM_GPIO_REGS
* 2,
246 dev_err(dev
, "Failed to save GPIO registers: %d\n", ret
);
248 /* For similar reasons we also stash the regulator states */
249 ret
= wm8994_read(wm8994
, WM8994_LDO_1
, WM8994_NUM_LDO_REGS
* 2,
252 dev_err(dev
, "Failed to save LDO registers: %d\n", ret
);
254 ret
= regulator_bulk_disable(wm8994
->num_supplies
,
257 dev_err(dev
, "Failed to disable supplies: %d\n", ret
);
264 static int wm8994_device_resume(struct device
*dev
)
266 struct wm8994
*wm8994
= dev_get_drvdata(dev
);
269 ret
= regulator_bulk_enable(wm8994
->num_supplies
,
272 dev_err(dev
, "Failed to enable supplies: %d\n", ret
);
276 ret
= wm8994_write(wm8994
, WM8994_INTERRUPT_STATUS_1_MASK
,
277 WM8994_NUM_IRQ_REGS
* 2, &wm8994
->irq_masks_cur
);
279 dev_err(dev
, "Failed to restore interrupt masks: %d\n", ret
);
281 ret
= wm8994_write(wm8994
, WM8994_LDO_1
, WM8994_NUM_LDO_REGS
* 2,
284 dev_err(dev
, "Failed to restore LDO registers: %d\n", ret
);
286 ret
= wm8994_write(wm8994
, WM8994_GPIO_1
, WM8994_NUM_GPIO_REGS
* 2,
289 dev_err(dev
, "Failed to restore GPIO registers: %d\n", ret
);
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
)
318 * Instantiate the generic non-control parts of the device.
320 static int wm8994_device_init(struct wm8994
*wm8994
, int irq
)
322 struct wm8994_pdata
*pdata
= wm8994
->dev
->platform_data
;
326 mutex_init(&wm8994
->io_lock
);
327 dev_set_drvdata(wm8994
->dev
, wm8994
);
329 /* Add the on-chip regulators first for bootstrapping */
330 ret
= mfd_add_devices(wm8994
->dev
, -1,
331 wm8994_regulator_devs
,
332 ARRAY_SIZE(wm8994_regulator_devs
),
335 dev_err(wm8994
->dev
, "Failed to add children: %d\n", ret
);
339 switch (wm8994
->type
) {
341 wm8994
->num_supplies
= ARRAY_SIZE(wm8994_main_supplies
);
344 wm8994
->num_supplies
= ARRAY_SIZE(wm8958_main_supplies
);
351 wm8994
->supplies
= kzalloc(sizeof(struct regulator_bulk_data
) *
352 wm8994
->num_supplies
,
354 if (!wm8994
->supplies
) {
359 switch (wm8994
->type
) {
361 for (i
= 0; i
< ARRAY_SIZE(wm8994_main_supplies
); i
++)
362 wm8994
->supplies
[i
].supply
= wm8994_main_supplies
[i
];
365 for (i
= 0; i
< ARRAY_SIZE(wm8958_main_supplies
); i
++)
366 wm8994
->supplies
[i
].supply
= wm8958_main_supplies
[i
];
373 ret
= regulator_bulk_get(wm8994
->dev
, wm8994
->num_supplies
,
376 dev_err(wm8994
->dev
, "Failed to get supplies: %d\n", ret
);
380 ret
= regulator_bulk_enable(wm8994
->num_supplies
,
383 dev_err(wm8994
->dev
, "Failed to enable supplies: %d\n", ret
);
387 ret
= wm8994_reg_read(wm8994
, WM8994_SOFTWARE_RESET
);
389 dev_err(wm8994
->dev
, "Failed to read ID register\n");
395 if (wm8994
->type
!= WM8994
)
396 dev_warn(wm8994
->dev
, "Device registered as type %d\n",
398 wm8994
->type
= WM8994
;
402 if (wm8994
->type
!= WM8958
)
403 dev_warn(wm8994
->dev
, "Device registered as type %d\n",
405 wm8994
->type
= WM8958
;
408 dev_err(wm8994
->dev
, "Device is not a WM8994, ID is %x\n",
414 ret
= wm8994_reg_read(wm8994
, WM8994_CHIP_REVISION
);
416 dev_err(wm8994
->dev
, "Failed to read revision register: %d\n",
424 if (wm8994
->type
== WM8994
)
425 dev_warn(wm8994
->dev
,
426 "revision %c not fully supported\n",
433 dev_info(wm8994
->dev
, "%s revision %c\n", devname
, 'A' + ret
);
436 wm8994
->irq_base
= pdata
->irq_base
;
437 wm8994
->gpio_base
= pdata
->gpio_base
;
439 /* GPIO configuration is only applied if it's non-zero */
440 for (i
= 0; i
< ARRAY_SIZE(pdata
->gpio_defaults
); i
++) {
441 if (pdata
->gpio_defaults
[i
]) {
442 wm8994_set_bits(wm8994
, WM8994_GPIO_1
+ i
,
444 pdata
->gpio_defaults
[i
]);
449 /* In some system designs where the regulators are not in use,
450 * we can achieve a small reduction in leakage currents by
451 * floating LDO outputs. This bit makes no difference if the
452 * LDOs are enabled, it only affects cases where the LDOs were
453 * in operation and are then disabled.
455 for (i
= 0; i
< WM8994_NUM_LDO_REGS
; i
++) {
456 if (wm8994_ldo_in_use(pdata
, i
))
457 wm8994_set_bits(wm8994
, WM8994_LDO_1
+ i
,
458 WM8994_LDO1_DISCH
, WM8994_LDO1_DISCH
);
460 wm8994_set_bits(wm8994
, WM8994_LDO_1
+ i
,
461 WM8994_LDO1_DISCH
, 0);
464 wm8994_irq_init(wm8994
);
466 ret
= mfd_add_devices(wm8994
->dev
, -1,
467 wm8994_devs
, ARRAY_SIZE(wm8994_devs
),
470 dev_err(wm8994
->dev
, "Failed to add children: %d\n", ret
);
477 wm8994_irq_exit(wm8994
);
479 regulator_bulk_disable(wm8994
->num_supplies
,
482 regulator_bulk_free(wm8994
->num_supplies
, wm8994
->supplies
);
484 kfree(wm8994
->supplies
);
486 mfd_remove_devices(wm8994
->dev
);
491 static void wm8994_device_exit(struct wm8994
*wm8994
)
493 mfd_remove_devices(wm8994
->dev
);
494 wm8994_irq_exit(wm8994
);
495 regulator_bulk_disable(wm8994
->num_supplies
,
497 regulator_bulk_free(wm8994
->num_supplies
, wm8994
->supplies
);
498 kfree(wm8994
->supplies
);
502 static int wm8994_i2c_read_device(struct wm8994
*wm8994
, unsigned short reg
,
503 int bytes
, void *dest
)
505 struct i2c_client
*i2c
= wm8994
->control_data
;
507 u16 r
= cpu_to_be16(reg
);
509 ret
= i2c_master_send(i2c
, (unsigned char *)&r
, 2);
515 ret
= i2c_master_recv(i2c
, dest
, bytes
);
523 /* Currently we allocate the write buffer on the stack; this is OK for
524 * small writes - if we need to do large writes this will need to be
527 static int wm8994_i2c_write_device(struct wm8994
*wm8994
, unsigned short reg
,
528 int bytes
, void *src
)
530 struct i2c_client
*i2c
= wm8994
->control_data
;
531 unsigned char msg
[bytes
+ 2];
534 reg
= cpu_to_be16(reg
);
535 memcpy(&msg
[0], ®
, 2);
536 memcpy(&msg
[2], src
, bytes
);
538 ret
= i2c_master_send(i2c
, msg
, bytes
+ 2);
547 static int wm8994_i2c_probe(struct i2c_client
*i2c
,
548 const struct i2c_device_id
*id
)
550 struct wm8994
*wm8994
;
552 wm8994
= kzalloc(sizeof(struct wm8994
), GFP_KERNEL
);
556 i2c_set_clientdata(i2c
, wm8994
);
557 wm8994
->dev
= &i2c
->dev
;
558 wm8994
->control_data
= i2c
;
559 wm8994
->read_dev
= wm8994_i2c_read_device
;
560 wm8994
->write_dev
= wm8994_i2c_write_device
;
561 wm8994
->irq
= i2c
->irq
;
562 wm8994
->type
= id
->driver_data
;
564 return wm8994_device_init(wm8994
, i2c
->irq
);
567 static int wm8994_i2c_remove(struct i2c_client
*i2c
)
569 struct wm8994
*wm8994
= i2c_get_clientdata(i2c
);
571 wm8994_device_exit(wm8994
);
577 static int wm8994_i2c_suspend(struct i2c_client
*i2c
, pm_message_t state
)
579 return wm8994_device_suspend(&i2c
->dev
);
582 static int wm8994_i2c_resume(struct i2c_client
*i2c
)
584 return wm8994_device_resume(&i2c
->dev
);
587 #define wm8994_i2c_suspend NULL
588 #define wm8994_i2c_resume NULL
591 static const struct i2c_device_id wm8994_i2c_id
[] = {
592 { "wm8994", WM8994
},
593 { "wm8958", WM8958
},
596 MODULE_DEVICE_TABLE(i2c
, wm8994_i2c_id
);
598 static struct i2c_driver wm8994_i2c_driver
= {
601 .owner
= THIS_MODULE
,
603 .probe
= wm8994_i2c_probe
,
604 .remove
= wm8994_i2c_remove
,
605 .suspend
= wm8994_i2c_suspend
,
606 .resume
= wm8994_i2c_resume
,
607 .id_table
= wm8994_i2c_id
,
610 static int __init
wm8994_i2c_init(void)
614 ret
= i2c_add_driver(&wm8994_i2c_driver
);
616 pr_err("Failed to register wm8994 I2C driver: %d\n", ret
);
620 module_init(wm8994_i2c_init
);
622 static void __exit
wm8994_i2c_exit(void)
624 i2c_del_driver(&wm8994_i2c_driver
);
626 module_exit(wm8994_i2c_exit
);
628 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
629 MODULE_LICENSE("GPL");
630 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");