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57d4bf6d JK |
1 | #include <sound/driver.h> |
2 | #include <sound/core.h> | |
3 | #include <sound/info.h> | |
4 | #include <sound/control.h> | |
5 | #include <sound/ac97_codec.h> | |
c8974be5 JC |
6 | |
7 | #include <asm/olpc.h> | |
57d4bf6d JK |
8 | #include "cs5535audio.h" |
9 | ||
10 | /* OLPC has an additional feature on top of regular AD1888 codec | |
11 | features. This is support for an analog input mode. This is a | |
12 | 2 step process. First, to turn off the AD1888 codec bias voltage | |
13 | and high pass filter. Second, to tell the embedded controller to | |
14 | reroute from a capacitive trace to a direct trace using an analog | |
15 | switch. The *_ec()s are what talk to that controller */ | |
16 | ||
17 | static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol, | |
18 | struct snd_ctl_elem_info *uinfo) | |
19 | { | |
20 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
21 | uinfo->count = 1; | |
22 | uinfo->value.integer.min = 0; | |
23 | uinfo->value.integer.max = 1; | |
24 | return 0; | |
25 | } | |
26 | ||
27 | #define AD1888_VREFOUT_EN_BIT (1 << 2) | |
28 | #define AD1888_HPF_EN_BIT (1 << 12) | |
29 | static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol, | |
30 | struct snd_ctl_elem_value *ucontrol) | |
31 | { | |
32 | struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); | |
33 | u16 reg1, reg2; | |
34 | ||
35 | /* if either AD1888 VRef Bias and High Pass Filter are enabled | |
36 | or the EC is not in analog mode then flag as not in analog mode. | |
37 | No EC command to read current analog state so we cache that. */ | |
38 | reg1 = snd_ac97_read(cs5535au->ac97, AC97_AD_MISC); | |
39 | reg2 = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2); | |
40 | ||
41 | if ((reg1 & AD1888_VREFOUT_EN_BIT) && (reg2 & AD1888_HPF_EN_BIT) && | |
42 | cs5535au->ec_analog_input_mode) | |
43 | ucontrol->value.integer.value[0] = 1; | |
44 | else | |
45 | ucontrol->value.integer.value[0] = 0; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol, | |
51 | struct snd_ctl_elem_value *ucontrol) | |
52 | { | |
53 | int err; | |
54 | struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); | |
55 | u8 value; | |
56 | struct snd_ac97 *ac97 = cs5535au->ac97; | |
57 | ||
58 | /* value is 1 if analog input is desired */ | |
59 | value = ucontrol->value.integer.value[0]; | |
60 | ||
61 | /* use ec mode as flag to determine if any change needed */ | |
62 | if (cs5535au->ec_analog_input_mode == value) | |
63 | return 0; | |
64 | ||
65 | /* sets High Z on VREF Bias if 1 */ | |
66 | if (value) | |
67 | err = snd_ac97_update_bits(ac97, AC97_AD_MISC, | |
68 | AD1888_VREFOUT_EN_BIT, AD1888_VREFOUT_EN_BIT); | |
69 | else | |
70 | err = snd_ac97_update_bits(ac97, AC97_AD_MISC, | |
71 | AD1888_VREFOUT_EN_BIT, 0); | |
72 | if (err < 0) | |
73 | snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err); | |
74 | ||
75 | /* turns off High Pass Filter if 1 */ | |
76 | if (value) | |
77 | err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, | |
78 | AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT); | |
79 | else | |
80 | err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, | |
81 | AD1888_HPF_EN_BIT, 0); | |
82 | if (err < 0) | |
83 | snd_printk(KERN_ERR "Error updating AD_TEST2 %d\n", err); | |
84 | ||
c8974be5 | 85 | /* B2 and newer writes directly to a GPIO pin */ |
57d4bf6d | 86 | if (value) |
c8974be5 | 87 | geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL); |
57d4bf6d | 88 | else |
c8974be5 | 89 | geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL); |
57d4bf6d JK |
90 | |
91 | cs5535au->ec_analog_input_mode = value; | |
92 | ||
93 | return 1; | |
94 | } | |
95 | ||
96 | static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata = | |
97 | { | |
98 | .iface = SNDRV_CTL_ELEM_IFACE_MIXER, | |
99 | .name = "Analog Input Switch", | |
100 | .info = snd_cs5535audio_ctl_info, | |
101 | .get = snd_cs5535audio_ctl_get, | |
102 | .put = snd_cs5535audio_ctl_put, | |
103 | .private_value = 0 | |
104 | }; | |
105 | ||
106 | int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) | |
107 | { | |
c8974be5 JC |
108 | if (!machine_is_olpc()) |
109 | return 0; | |
110 | ||
57d4bf6d JK |
111 | /* setup callback for mixer control that does analog input mode */ |
112 | return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls, | |
113 | ac97->private_data)); | |
114 | } | |
115 |