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57d4bf6d JK |
1 | #include <linux/olpc.h> |
2 | #include <sound/driver.h> | |
3 | #include <sound/core.h> | |
4 | #include <sound/info.h> | |
5 | #include <sound/control.h> | |
6 | #include <sound/ac97_codec.h> | |
7 | #include "cs5535audio.h" | |
8 | ||
9 | /* OLPC has an additional feature on top of regular AD1888 codec | |
10 | features. This is support for an analog input mode. This is a | |
11 | 2 step process. First, to turn off the AD1888 codec bias voltage | |
12 | and high pass filter. Second, to tell the embedded controller to | |
13 | reroute from a capacitive trace to a direct trace using an analog | |
14 | switch. The *_ec()s are what talk to that controller */ | |
15 | ||
16 | static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol, | |
17 | struct snd_ctl_elem_info *uinfo) | |
18 | { | |
19 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
20 | uinfo->count = 1; | |
21 | uinfo->value.integer.min = 0; | |
22 | uinfo->value.integer.max = 1; | |
23 | return 0; | |
24 | } | |
25 | ||
26 | #define AD1888_VREFOUT_EN_BIT (1 << 2) | |
27 | #define AD1888_HPF_EN_BIT (1 << 12) | |
28 | static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol, | |
29 | struct snd_ctl_elem_value *ucontrol) | |
30 | { | |
31 | struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); | |
32 | u16 reg1, reg2; | |
33 | ||
34 | /* if either AD1888 VRef Bias and High Pass Filter are enabled | |
35 | or the EC is not in analog mode then flag as not in analog mode. | |
36 | No EC command to read current analog state so we cache that. */ | |
37 | reg1 = snd_ac97_read(cs5535au->ac97, AC97_AD_MISC); | |
38 | reg2 = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2); | |
39 | ||
40 | if ((reg1 & AD1888_VREFOUT_EN_BIT) && (reg2 & AD1888_HPF_EN_BIT) && | |
41 | cs5535au->ec_analog_input_mode) | |
42 | ucontrol->value.integer.value[0] = 1; | |
43 | else | |
44 | ucontrol->value.integer.value[0] = 0; | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol, | |
50 | struct snd_ctl_elem_value *ucontrol) | |
51 | { | |
52 | int err; | |
53 | struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); | |
54 | u8 value; | |
55 | struct snd_ac97 *ac97 = cs5535au->ac97; | |
56 | ||
57 | /* value is 1 if analog input is desired */ | |
58 | value = ucontrol->value.integer.value[0]; | |
59 | ||
60 | /* use ec mode as flag to determine if any change needed */ | |
61 | if (cs5535au->ec_analog_input_mode == value) | |
62 | return 0; | |
63 | ||
64 | /* sets High Z on VREF Bias if 1 */ | |
65 | if (value) | |
66 | err = snd_ac97_update_bits(ac97, AC97_AD_MISC, | |
67 | AD1888_VREFOUT_EN_BIT, AD1888_VREFOUT_EN_BIT); | |
68 | else | |
69 | err = snd_ac97_update_bits(ac97, AC97_AD_MISC, | |
70 | AD1888_VREFOUT_EN_BIT, 0); | |
71 | if (err < 0) | |
72 | snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err); | |
73 | ||
74 | /* turns off High Pass Filter if 1 */ | |
75 | if (value) | |
76 | err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, | |
77 | AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT); | |
78 | else | |
79 | err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, | |
80 | AD1888_HPF_EN_BIT, 0); | |
81 | if (err < 0) | |
82 | snd_printk(KERN_ERR "Error updating AD_TEST2 %d\n", err); | |
83 | ||
84 | if (value) | |
85 | err = write_ec_command(0x01); /* activate MIC_AC_OFF */ | |
86 | else | |
87 | err = write_ec_command(0x02); /* deactivates MIC_AC_OFF */ | |
88 | ||
89 | if (err < 0) | |
90 | snd_printk(KERN_ERR "Error talking to EC %d\n", err); | |
91 | ||
92 | cs5535au->ec_analog_input_mode = value; | |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
97 | static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata = | |
98 | { | |
99 | .iface = SNDRV_CTL_ELEM_IFACE_MIXER, | |
100 | .name = "Analog Input Switch", | |
101 | .info = snd_cs5535audio_ctl_info, | |
102 | .get = snd_cs5535audio_ctl_get, | |
103 | .put = snd_cs5535audio_ctl_put, | |
104 | .private_value = 0 | |
105 | }; | |
106 | ||
107 | int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) | |
108 | { | |
109 | /* setup callback for mixer control that does analog input mode */ | |
110 | return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls, | |
111 | ac97->private_data)); | |
112 | } | |
113 |