diff options
Diffstat (limited to 'kernel/sound/hda/hdac_regmap.c')
| -rw-r--r-- | kernel/sound/hda/hdac_regmap.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/kernel/sound/hda/hdac_regmap.c b/kernel/sound/hda/hdac_regmap.c new file mode 100644 index 000000000..1eabcdf69 --- /dev/null +++ b/kernel/sound/hda/hdac_regmap.c @@ -0,0 +1,480 @@ +/* + * Regmap support for HD-audio verbs + * + * A virtual register is translated to one or more hda verbs for write, + * vice versa for read. + * + * A few limitations: + * - Provided for not all verbs but only subset standard non-volatile verbs. + * - For reading, only AC_VERB_GET_* variants can be used. + * - For writing, mapped to the *corresponding* AC_VERB_SET_* variants, + * so can't handle asymmetric verbs for read and write + */ + +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/regmap.h> +#include <linux/export.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <sound/core.h> +#include <sound/hdaudio.h> +#include <sound/hda_regmap.h> + +#ifdef CONFIG_PM +#define codec_is_running(codec) \ + (atomic_read(&(codec)->in_pm) || \ + !pm_runtime_suspended(&(codec)->dev)) +#else +#define codec_is_running(codec) true +#endif + +#define get_verb(reg) (((reg) >> 8) & 0xfff) + +static bool hda_volatile_reg(struct device *dev, unsigned int reg) +{ + struct hdac_device *codec = dev_to_hdac_dev(dev); + unsigned int verb = get_verb(reg); + + switch (verb) { + case AC_VERB_GET_PROC_COEF: + return !codec->cache_coef; + case AC_VERB_GET_COEF_INDEX: + case AC_VERB_GET_PROC_STATE: + case AC_VERB_GET_POWER_STATE: + case AC_VERB_GET_PIN_SENSE: + case AC_VERB_GET_HDMI_DIP_SIZE: + case AC_VERB_GET_HDMI_ELDD: + case AC_VERB_GET_HDMI_DIP_INDEX: + case AC_VERB_GET_HDMI_DIP_DATA: + case AC_VERB_GET_HDMI_DIP_XMIT: + case AC_VERB_GET_HDMI_CP_CTRL: + case AC_VERB_GET_HDMI_CHAN_SLOT: + case AC_VERB_GET_DEVICE_SEL: + case AC_VERB_GET_DEVICE_LIST: /* read-only volatile */ + return true; + } + + return false; +} + +static bool hda_writeable_reg(struct device *dev, unsigned int reg) +{ + struct hdac_device *codec = dev_to_hdac_dev(dev); + unsigned int verb = get_verb(reg); + int i; + + for (i = 0; i < codec->vendor_verbs.used; i++) { + unsigned int *v = snd_array_elem(&codec->vendor_verbs, i); + if (verb == *v) + return true; + } + + if (codec->caps_overwriting) + return true; + + switch (verb & 0xf00) { + case AC_VERB_GET_STREAM_FORMAT: + case AC_VERB_GET_AMP_GAIN_MUTE: + return true; + case AC_VERB_GET_PROC_COEF: + return codec->cache_coef; + case 0xf00: + break; + default: + return false; + } + + switch (verb) { + case AC_VERB_GET_CONNECT_SEL: + case AC_VERB_GET_SDI_SELECT: + case AC_VERB_GET_PIN_WIDGET_CONTROL: + case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ + case AC_VERB_GET_BEEP_CONTROL: + case AC_VERB_GET_EAPD_BTLENABLE: + case AC_VERB_GET_DIGI_CONVERT_1: + case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ + case AC_VERB_GET_VOLUME_KNOB_CONTROL: + case AC_VERB_GET_GPIO_MASK: + case AC_VERB_GET_GPIO_DIRECTION: + case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ + case AC_VERB_GET_GPIO_WAKE_MASK: + case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: + case AC_VERB_GET_GPIO_STICKY_MASK: + return true; + } + + return false; +} + +static bool hda_readable_reg(struct device *dev, unsigned int reg) +{ + struct hdac_device *codec = dev_to_hdac_dev(dev); + unsigned int verb = get_verb(reg); + + if (codec->caps_overwriting) + return true; + + switch (verb) { + case AC_VERB_PARAMETERS: + case AC_VERB_GET_CONNECT_LIST: + case AC_VERB_GET_SUBSYSTEM_ID: + return true; + /* below are basically writable, but disabled for reducing unnecessary + * writes at sync + */ + case AC_VERB_GET_CONFIG_DEFAULT: /* usually just read */ + case AC_VERB_GET_CONV: /* managed in PCM code */ + case AC_VERB_GET_CVT_CHAN_COUNT: /* managed in HDMI CA code */ + return true; + } + + return hda_writeable_reg(dev, reg); +} + +/* + * Stereo amp pseudo register: + * for making easier to handle the stereo volume control, we provide a + * fake register to deal both left and right channels by a single + * (pseudo) register access. A verb consisting of SET_AMP_GAIN with + * *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit + * for the left and the upper 8bit for the right channel. + */ +static bool is_stereo_amp_verb(unsigned int reg) +{ + if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE) + return false; + return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) == + (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); +} + +/* read a pseudo stereo amp register (16bit left+right) */ +static int hda_reg_read_stereo_amp(struct hdac_device *codec, + unsigned int reg, unsigned int *val) +{ + unsigned int left, right; + int err; + + reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); + err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left); + if (err < 0) + return err; + err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right); + if (err < 0) + return err; + *val = left | (right << 8); + return 0; +} + +/* write a pseudo stereo amp register (16bit left+right) */ +static int hda_reg_write_stereo_amp(struct hdac_device *codec, + unsigned int reg, unsigned int val) +{ + int err; + unsigned int verb, left, right; + + verb = AC_VERB_SET_AMP_GAIN_MUTE << 8; + if (reg & AC_AMP_GET_OUTPUT) + verb |= AC_AMP_SET_OUTPUT; + else + verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8); + reg = (reg & ~0xfffff) | verb; + + left = val & 0xff; + right = (val >> 8) & 0xff; + if (left == right) { + reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT; + return snd_hdac_exec_verb(codec, reg | left, 0, NULL); + } + + err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL); + if (err < 0) + return err; + err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL); + if (err < 0) + return err; + return 0; +} + +/* read a pseudo coef register (16bit) */ +static int hda_reg_read_coef(struct hdac_device *codec, unsigned int reg, + unsigned int *val) +{ + unsigned int verb; + int err; + + if (!codec->cache_coef) + return -EINVAL; + /* LSB 8bit = coef index */ + verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); + err = snd_hdac_exec_verb(codec, verb, 0, NULL); + if (err < 0) + return err; + verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8); + return snd_hdac_exec_verb(codec, verb, 0, val); +} + +/* write a pseudo coef register (16bit) */ +static int hda_reg_write_coef(struct hdac_device *codec, unsigned int reg, + unsigned int val) +{ + unsigned int verb; + int err; + + if (!codec->cache_coef) + return -EINVAL; + /* LSB 8bit = coef index */ + verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); + err = snd_hdac_exec_verb(codec, verb, 0, NULL); + if (err < 0) + return err; + verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) | + (val & 0xffff); + return snd_hdac_exec_verb(codec, verb, 0, NULL); +} + +static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) +{ + struct hdac_device *codec = context; + int verb = get_verb(reg); + int err; + + if (!codec_is_running(codec) && verb != AC_VERB_GET_POWER_STATE) + return -EAGAIN; + reg |= (codec->addr << 28); + if (is_stereo_amp_verb(reg)) + return hda_reg_read_stereo_amp(codec, reg, val); + if (verb == AC_VERB_GET_PROC_COEF) + return hda_reg_read_coef(codec, reg, val); + if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE) + reg &= ~AC_AMP_FAKE_MUTE; + + err = snd_hdac_exec_verb(codec, reg, 0, val); + if (err < 0) + return err; + /* special handling for asymmetric reads */ + if (verb == AC_VERB_GET_POWER_STATE) { + if (*val & AC_PWRST_ERROR) + *val = -1; + else /* take only the actual state */ + *val = (*val >> 4) & 0x0f; + } + return 0; +} + +static int hda_reg_write(void *context, unsigned int reg, unsigned int val) +{ + struct hdac_device *codec = context; + unsigned int verb; + int i, bytes, err; + + if (codec->caps_overwriting) + return 0; + + reg &= ~0x00080000U; /* drop GET bit */ + reg |= (codec->addr << 28); + verb = get_verb(reg); + + if (!codec_is_running(codec) && verb != AC_VERB_SET_POWER_STATE) + return codec->lazy_cache ? 0 : -EAGAIN; + + if (is_stereo_amp_verb(reg)) + return hda_reg_write_stereo_amp(codec, reg, val); + + if (verb == AC_VERB_SET_PROC_COEF) + return hda_reg_write_coef(codec, reg, val); + + switch (verb & 0xf00) { + case AC_VERB_SET_AMP_GAIN_MUTE: + if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE)) + val = 0; + verb = AC_VERB_SET_AMP_GAIN_MUTE; + if (reg & AC_AMP_GET_LEFT) + verb |= AC_AMP_SET_LEFT >> 8; + else + verb |= AC_AMP_SET_RIGHT >> 8; + if (reg & AC_AMP_GET_OUTPUT) { + verb |= AC_AMP_SET_OUTPUT >> 8; + } else { + verb |= AC_AMP_SET_INPUT >> 8; + verb |= reg & 0xf; + } + break; + } + + switch (verb) { + case AC_VERB_SET_DIGI_CONVERT_1: + bytes = 2; + break; + case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: + bytes = 4; + break; + default: + bytes = 1; + break; + } + + for (i = 0; i < bytes; i++) { + reg &= ~0xfffff; + reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); + err = snd_hdac_exec_verb(codec, reg, 0, NULL); + if (err < 0) + return err; + } + + return 0; +} + +static const struct regmap_config hda_regmap_cfg = { + .name = "hdaudio", + .reg_bits = 32, + .val_bits = 32, + .max_register = 0xfffffff, + .writeable_reg = hda_writeable_reg, + .readable_reg = hda_readable_reg, + .volatile_reg = hda_volatile_reg, + .cache_type = REGCACHE_RBTREE, + .reg_read = hda_reg_read, + .reg_write = hda_reg_write, + .use_single_rw = true, +}; + +int snd_hdac_regmap_init(struct hdac_device *codec) +{ + struct regmap *regmap; + + regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + codec->regmap = regmap; + snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); + return 0; +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); + +void snd_hdac_regmap_exit(struct hdac_device *codec) +{ + if (codec->regmap) { + regmap_exit(codec->regmap); + codec->regmap = NULL; + snd_array_free(&codec->vendor_verbs); + } +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); + +/** + * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap + * @codec: the codec object + * @verb: verb to allow accessing via regmap + * + * Returns zero for success or a negative error code. + */ +int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, + unsigned int verb) +{ + unsigned int *p = snd_array_new(&codec->vendor_verbs); + + if (!p) + return -ENOMEM; + *p = verb | 0x800; /* set GET bit */ + return 0; +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); + +/* + * helper functions + */ + +/* write a pseudo-register value (w/o power sequence) */ +static int reg_raw_write(struct hdac_device *codec, unsigned int reg, + unsigned int val) +{ + if (!codec->regmap) + return hda_reg_write(codec, reg, val); + else + return regmap_write(codec->regmap, reg, val); +} + +/** + * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt + * @codec: the codec object + * @reg: pseudo register + * @val: value to write + * + * Returns zero if successful or a negative error code. + */ +int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, + unsigned int val) +{ + int err; + + err = reg_raw_write(codec, reg, val); + if (err == -EAGAIN) { + snd_hdac_power_up_pm(codec); + err = reg_raw_write(codec, reg, val); + snd_hdac_power_down_pm(codec); + } + return err; +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); + +static int reg_raw_read(struct hdac_device *codec, unsigned int reg, + unsigned int *val) +{ + if (!codec->regmap) + return hda_reg_read(codec, reg, val); + else + return regmap_read(codec->regmap, reg, val); +} + +/** + * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt + * @codec: the codec object + * @reg: pseudo register + * @val: pointer to store the read value + * + * Returns zero if successful or a negative error code. + */ +int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, + unsigned int *val) +{ + int err; + + err = reg_raw_read(codec, reg, val); + if (err == -EAGAIN) { + snd_hdac_power_up_pm(codec); + err = reg_raw_read(codec, reg, val); + snd_hdac_power_down_pm(codec); + } + return err; +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); + +/** + * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt + * @codec: the codec object + * @reg: pseudo register + * @mask: bit mask to udpate + * @val: value to update + * + * Returns zero if successful or a negative error code. + */ +int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, + unsigned int mask, unsigned int val) +{ + unsigned int orig; + int err; + + val &= mask; + err = snd_hdac_regmap_read_raw(codec, reg, &orig); + if (err < 0) + return err; + val |= orig & ~mask; + if (val == orig) + return 0; + err = snd_hdac_regmap_write_raw(codec, reg, val); + if (err < 0) + return err; + return 1; +} +EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |