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kernel-fxtec-pro1x/drivers/mfd/wm97xx-core.c
Robert Jarzmik 46f107d0cb mfd: wm97xx-core: Platform data can be NULL 
It is not mandatory that platform data is passed along the ac97
codec. Actually there are configuration without a battery connected to
the ADC of the codec.

This is for example the case for the PXA zylonite platform, so fix the
NULL dereferencing by adding a test.

Fixes: a5c6951c49 ("mfd: wm97xx-core: core support for wm97xx Codec")
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-06-11 09:11:03 +01:00

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/*
* Wolfson WM97xx -- Core device
*
* Copyright (C) 2017 Robert Jarzmik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Features:
* - an AC97 audio codec
* - a touchscreen driver
* - a GPIO block
*/
#include <linux/device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/wm97xx.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/wm97xx.h>
#include <sound/ac97/codec.h>
#include <sound/ac97/compat.h>
#define WM9705_VENDOR_ID 0x574d4c05
#define WM9712_VENDOR_ID 0x574d4c12
#define WM9713_VENDOR_ID 0x574d4c13
#define WM97xx_VENDOR_ID_MASK 0xffffffff
struct wm97xx_priv {
struct regmap *regmap;
struct snd_ac97 *ac97;
struct device *dev;
struct wm97xx_platform_data codec_pdata;
};
static bool wm97xx_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AC97_RESET ... AC97_PCM_SURR_DAC_RATE:
case AC97_PCM_LR_ADC_RATE:
case AC97_CENTER_LFE_MASTER:
case AC97_SPDIF ... AC97_LINE1_LEVEL:
case AC97_GPIO_CFG ... 0x5c:
case AC97_CODEC_CLASS_REV ... AC97_PCI_SID:
case 0x74 ... AC97_VENDOR_ID2:
return true;
default:
return false;
}
}
static bool wm97xx_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AC97_VENDOR_ID1:
case AC97_VENDOR_ID2:
return false;
default:
return wm97xx_readable_reg(dev, reg);
}
}
static const struct reg_default wm9705_reg_defaults[] = {
{ 0x02, 0x8000 },
{ 0x04, 0x8000 },
{ 0x06, 0x8000 },
{ 0x0a, 0x8000 },
{ 0x0c, 0x8008 },
{ 0x0e, 0x8008 },
{ 0x10, 0x8808 },
{ 0x12, 0x8808 },
{ 0x14, 0x8808 },
{ 0x16, 0x8808 },
{ 0x18, 0x8808 },
{ 0x1a, 0x0000 },
{ 0x1c, 0x8000 },
{ 0x20, 0x0000 },
{ 0x22, 0x0000 },
{ 0x26, 0x000f },
{ 0x28, 0x0605 },
{ 0x2a, 0x0000 },
{ 0x2c, 0xbb80 },
{ 0x32, 0xbb80 },
{ 0x34, 0x2000 },
{ 0x5a, 0x0000 },
{ 0x5c, 0x0000 },
{ 0x72, 0x0808 },
{ 0x74, 0x0000 },
{ 0x76, 0x0006 },
{ 0x78, 0x0000 },
{ 0x7a, 0x0000 },
};
static const struct regmap_config wm9705_regmap_config = {
.reg_bits = 16,
.reg_stride = 2,
.val_bits = 16,
.max_register = 0x7e,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = wm9705_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm9705_reg_defaults),
.volatile_reg = regmap_ac97_default_volatile,
.readable_reg = wm97xx_readable_reg,
.writeable_reg = wm97xx_writeable_reg,
};
static struct mfd_cell wm9705_cells[] = {
{ .name = "wm9705-codec", },
{ .name = "wm97xx-ts", },
};
static bool wm9712_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AC97_REC_GAIN:
return true;
default:
return regmap_ac97_default_volatile(dev, reg);
}
}
static const struct reg_default wm9712_reg_defaults[] = {
{ 0x02, 0x8000 },
{ 0x04, 0x8000 },
{ 0x06, 0x8000 },
{ 0x08, 0x0f0f },
{ 0x0a, 0xaaa0 },
{ 0x0c, 0xc008 },
{ 0x0e, 0x6808 },
{ 0x10, 0xe808 },
{ 0x12, 0xaaa0 },
{ 0x14, 0xad00 },
{ 0x16, 0x8000 },
{ 0x18, 0xe808 },
{ 0x1a, 0x3000 },
{ 0x1c, 0x8000 },
{ 0x20, 0x0000 },
{ 0x22, 0x0000 },
{ 0x26, 0x000f },
{ 0x28, 0x0605 },
{ 0x2a, 0x0410 },
{ 0x2c, 0xbb80 },
{ 0x2e, 0xbb80 },
{ 0x32, 0xbb80 },
{ 0x34, 0x2000 },
{ 0x4c, 0xf83e },
{ 0x4e, 0xffff },
{ 0x50, 0x0000 },
{ 0x52, 0x0000 },
{ 0x56, 0xf83e },
{ 0x58, 0x0008 },
{ 0x5c, 0x0000 },
{ 0x60, 0xb032 },
{ 0x62, 0x3e00 },
{ 0x64, 0x0000 },
{ 0x76, 0x0006 },
{ 0x78, 0x0001 },
{ 0x7a, 0x0000 },
};
static const struct regmap_config wm9712_regmap_config = {
.reg_bits = 16,
.reg_stride = 2,
.val_bits = 16,
.max_register = 0x7e,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = wm9712_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm9712_reg_defaults),
.volatile_reg = wm9712_volatile_reg,
.readable_reg = wm97xx_readable_reg,
.writeable_reg = wm97xx_writeable_reg,
};
static struct mfd_cell wm9712_cells[] = {
{ .name = "wm9712-codec", },
{ .name = "wm97xx-ts", },
};
static const struct reg_default wm9713_reg_defaults[] = {
{ 0x02, 0x8080 }, /* Speaker Output Volume */
{ 0x04, 0x8080 }, /* Headphone Output Volume */
{ 0x06, 0x8080 }, /* Out3/OUT4 Volume */
{ 0x08, 0xc880 }, /* Mono Volume */
{ 0x0a, 0xe808 }, /* LINEIN Volume */
{ 0x0c, 0xe808 }, /* DAC PGA Volume */
{ 0x0e, 0x0808 }, /* MIC PGA Volume */
{ 0x10, 0x00da }, /* MIC Routing Control */
{ 0x12, 0x8000 }, /* Record PGA Volume */
{ 0x14, 0xd600 }, /* Record Routing */
{ 0x16, 0xaaa0 }, /* PCBEEP Volume */
{ 0x18, 0xaaa0 }, /* VxDAC Volume */
{ 0x1a, 0xaaa0 }, /* AUXDAC Volume */
{ 0x1c, 0x0000 }, /* Output PGA Mux */
{ 0x1e, 0x0000 }, /* DAC 3D control */
{ 0x20, 0x0f0f }, /* DAC Tone Control*/
{ 0x22, 0x0040 }, /* MIC Input Select & Bias */
{ 0x24, 0x0000 }, /* Output Volume Mapping & Jack */
{ 0x26, 0x7f00 }, /* Powerdown Ctrl/Stat*/
{ 0x28, 0x0405 }, /* Extended Audio ID */
{ 0x2a, 0x0410 }, /* Extended Audio Start/Ctrl */
{ 0x2c, 0xbb80 }, /* Audio DACs Sample Rate */
{ 0x2e, 0xbb80 }, /* AUXDAC Sample Rate */
{ 0x32, 0xbb80 }, /* Audio ADCs Sample Rate */
{ 0x36, 0x4523 }, /* PCM codec control */
{ 0x3a, 0x2000 }, /* SPDIF control */
{ 0x3c, 0xfdff }, /* Powerdown 1 */
{ 0x3e, 0xffff }, /* Powerdown 2 */
{ 0x40, 0x0000 }, /* General Purpose */
{ 0x42, 0x0000 }, /* Fast Power-Up Control */
{ 0x44, 0x0080 }, /* MCLK/PLL Control */
{ 0x46, 0x0000 }, /* MCLK/PLL Control */
{ 0x4c, 0xfffe }, /* GPIO Pin Configuration */
{ 0x4e, 0xffff }, /* GPIO Pin Polarity / Type */
{ 0x50, 0x0000 }, /* GPIO Pin Sticky */
{ 0x52, 0x0000 }, /* GPIO Pin Wake-Up */
/* GPIO Pin Status */
{ 0x56, 0xfffe }, /* GPIO Pin Sharing */
{ 0x58, 0x4000 }, /* GPIO PullUp/PullDown */
{ 0x5a, 0x0000 }, /* Additional Functions 1 */
{ 0x5c, 0x0000 }, /* Additional Functions 2 */
{ 0x60, 0xb032 }, /* ALC Control */
{ 0x62, 0x3e00 }, /* ALC / Noise Gate Control */
{ 0x64, 0x0000 }, /* AUXDAC input control */
{ 0x74, 0x0000 }, /* Digitiser Reg 1 */
{ 0x76, 0x0006 }, /* Digitiser Reg 2 */
{ 0x78, 0x0001 }, /* Digitiser Reg 3 */
{ 0x7a, 0x0000 }, /* Digitiser Read Back */
};
static const struct regmap_config wm9713_regmap_config = {
.reg_bits = 16,
.reg_stride = 2,
.val_bits = 16,
.max_register = 0x7e,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = wm9713_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm9713_reg_defaults),
.volatile_reg = regmap_ac97_default_volatile,
.readable_reg = wm97xx_readable_reg,
.writeable_reg = wm97xx_writeable_reg,
};
static struct mfd_cell wm9713_cells[] = {
{ .name = "wm9713-codec", },
{ .name = "wm97xx-ts", },
};
static int wm97xx_ac97_probe(struct ac97_codec_device *adev)
{
struct wm97xx_priv *wm97xx;
const struct regmap_config *config;
struct wm97xx_platform_data *codec_pdata;
struct mfd_cell *cells;
int ret = -ENODEV, nb_cells, i;
struct wm97xx_pdata *pdata = snd_ac97_codec_get_platdata(adev);
wm97xx = devm_kzalloc(ac97_codec_dev2dev(adev),
sizeof(*wm97xx), GFP_KERNEL);
if (!wm97xx)
return -ENOMEM;
wm97xx->dev = ac97_codec_dev2dev(adev);
wm97xx->ac97 = snd_ac97_compat_alloc(adev);
if (IS_ERR(wm97xx->ac97))
return PTR_ERR(wm97xx->ac97);
ac97_set_drvdata(adev, wm97xx);
dev_info(wm97xx->dev, "wm97xx core found, id=0x%x\n",
adev->vendor_id);
codec_pdata = &wm97xx->codec_pdata;
codec_pdata->ac97 = wm97xx->ac97;
codec_pdata->batt_pdata = pdata ? pdata->batt_pdata : NULL;
switch (adev->vendor_id) {
case WM9705_VENDOR_ID:
config = &wm9705_regmap_config;
cells = wm9705_cells;
nb_cells = ARRAY_SIZE(wm9705_cells);
break;
case WM9712_VENDOR_ID:
config = &wm9712_regmap_config;
cells = wm9712_cells;
nb_cells = ARRAY_SIZE(wm9712_cells);
break;
case WM9713_VENDOR_ID:
config = &wm9713_regmap_config;
cells = wm9713_cells;
nb_cells = ARRAY_SIZE(wm9713_cells);
break;
default:
goto err_free_compat;
}
for (i = 0; i < nb_cells; i++) {
cells[i].platform_data = codec_pdata;
cells[i].pdata_size = sizeof(*codec_pdata);
}
codec_pdata->regmap = devm_regmap_init_ac97(wm97xx->ac97, config);
if (IS_ERR(codec_pdata->regmap)) {
ret = PTR_ERR(codec_pdata->regmap);
goto err_free_compat;
}
ret = devm_mfd_add_devices(wm97xx->dev, PLATFORM_DEVID_NONE,
cells, nb_cells, NULL, 0, NULL);
if (ret)
goto err_free_compat;
return ret;
err_free_compat:
snd_ac97_compat_release(wm97xx->ac97);
return ret;
}
static int wm97xx_ac97_remove(struct ac97_codec_device *adev)
{
struct wm97xx_priv *wm97xx = ac97_get_drvdata(adev);
snd_ac97_compat_release(wm97xx->ac97);
return 0;
}
static const struct ac97_id wm97xx_ac97_ids[] = {
{ .id = WM9705_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },
{ .id = WM9712_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },
{ .id = WM9713_VENDOR_ID, .mask = WM97xx_VENDOR_ID_MASK },
{ }
};
static struct ac97_codec_driver wm97xx_ac97_driver = {
.driver = {
.name = "wm97xx-core",
},
.probe = wm97xx_ac97_probe,
.remove = wm97xx_ac97_remove,
.id_table = wm97xx_ac97_ids,
};
static int __init wm97xx_module_init(void)
{
return snd_ac97_codec_driver_register(&wm97xx_ac97_driver);
}
module_init(wm97xx_module_init);
static void __exit wm97xx_module_exit(void)
{
snd_ac97_codec_driver_unregister(&wm97xx_ac97_driver);
}
module_exit(wm97xx_module_exit);
MODULE_DESCRIPTION("WM9712, WM9713 core driver");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_LICENSE("GPL");
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