--- /dev/null
+/*
+ * 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);
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