+struct ac97_power_reg {
+ unsigned short reg;
+ unsigned short power_reg;
+ unsigned short mask;
+};
+
+enum { PWIDX_ADC, PWIDX_FRONT, PWIDX_CLFE, PWIDX_SURR, PWIDX_MIC, PWIDX_SIZE };
+
+static struct ac97_power_reg power_regs[PWIDX_SIZE] = {
+ [PWIDX_ADC] = { AC97_PCM_LR_ADC_RATE, AC97_POWERDOWN, AC97_PD_PR0},
+ [PWIDX_FRONT] = { AC97_PCM_FRONT_DAC_RATE, AC97_POWERDOWN, AC97_PD_PR1},
+ [PWIDX_CLFE] = { AC97_PCM_LFE_DAC_RATE, AC97_EXTENDED_STATUS,
+ AC97_EA_PRI | AC97_EA_PRK},
+ [PWIDX_SURR] = { AC97_PCM_SURR_DAC_RATE, AC97_EXTENDED_STATUS,
+ AC97_EA_PRJ},
+ [PWIDX_MIC] = { AC97_PCM_MIC_ADC_RATE, AC97_EXTENDED_STATUS,
+ AC97_EA_PRL},
+};
+
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+/**
+ * snd_ac97_update_power - update the powerdown register
+ * @ac97: the codec instance
+ * @reg: the rate register, e.g. AC97_PCM_FRONT_DAC_RATE
+ * @powerup: non-zero when power up the part
+ *
+ * Update the AC97 powerdown register bits of the given part.
+ */
+int snd_ac97_update_power(struct snd_ac97 *ac97, int reg, int powerup)
+{
+ int i;
+
+ if (! ac97)
+ return 0;
+
+ if (reg) {
+ /* SPDIF requires DAC power, too */
+ if (reg == AC97_SPDIF)
+ reg = AC97_PCM_FRONT_DAC_RATE;
+ for (i = 0; i < PWIDX_SIZE; i++) {
+ if (power_regs[i].reg == reg) {
+ if (powerup)
+ ac97->power_up |= (1 << i);
+ else
+ ac97->power_up &= ~(1 << i);
+ break;
+ }
+ }
+ }
+
+ if (power_save && !powerup && ac97->power_workq)
+ /* adjust power-down bits after two seconds delay
+ * (for avoiding loud click noises for many (OSS) apps
+ * that open/close frequently)
+ */
+ queue_delayed_work(ac97->power_workq, &ac97->power_work, HZ*2);
+ else
+ update_power_regs(ac97);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_ac97_update_power);
+#endif /* CONFIG_SND_AC97_POWER_SAVE */
+
+static void update_power_regs(struct snd_ac97 *ac97)
+{
+ unsigned int power_up, bits;
+ int i;
+
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+ if (power_save)
+ power_up = ac97->power_up;
+ else {
+#endif
+ power_up = (1 << PWIDX_FRONT) | (1 << PWIDX_ADC);
+ power_up |= (1 << PWIDX_MIC);
+ if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
+ power_up |= (1 << PWIDX_SURR);
+ if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
+ power_up |= (1 << PWIDX_CLFE);
+#ifdef CONFIG_SND_AC97_POWER_SAVE
+ }
+#endif
+ if (power_up) {
+ if (ac97->regs[AC97_POWERDOWN] & AC97_PD_PR2) {
+ /* needs power-up analog mix and vref */
+ snd_ac97_update_bits(ac97, AC97_POWERDOWN,
+ AC97_PD_PR3, 0);
+ msleep(1);
+ snd_ac97_update_bits(ac97, AC97_POWERDOWN,
+ AC97_PD_PR2, 0);
+ }
+ }
+ for (i = 0; i < PWIDX_SIZE; i++) {
+ if (power_up & (1 << i))
+ bits = 0;
+ else
+ bits = power_regs[i].mask;
+ snd_ac97_update_bits(ac97, power_regs[i].power_reg,
+ power_regs[i].mask, bits);
+ }
+ if (! power_up) {
+ if (! (ac97->regs[AC97_POWERDOWN] & AC97_PD_PR2)) {
+ /* power down analog mix and vref */
+ snd_ac97_update_bits(ac97, AC97_POWERDOWN,
+ AC97_PD_PR2, AC97_PD_PR2);
+ snd_ac97_update_bits(ac97, AC97_POWERDOWN,
+ AC97_PD_PR3, AC97_PD_PR3);
+ }
+ }
+}
+
+