| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | // |
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| 3 | // Common code for Cirrus side-codecs. |
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| 4 | // |
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| 5 | // Copyright (C) 2021, 2023 Cirrus Logic, Inc. and |
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| 6 | // Cirrus Logic International Semiconductor Ltd. |
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| 7 | |
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| 8 | #include <linux/dev_printk.h> |
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| 9 | #include <linux/gpio/consumer.h> |
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| 10 | #include <linux/module.h> |
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| 11 | |
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| 12 | #include "cirrus_scodec.h" |
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| 13 | |
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| 14 | int cirrus_scodec_get_speaker_id(struct device *dev, int amp_index, |
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| 15 | int num_amps, int fixed_gpio_id) |
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| 16 | { |
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| 17 | struct gpio_desc *speaker_id_desc; |
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| 18 | int speaker_id = -ENOENT; |
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| 19 | |
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| 20 | if (fixed_gpio_id >= 0) { |
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| 21 | dev_dbg(dev, "Found Fixed Speaker ID GPIO (index = %d)\n" , fixed_gpio_id); |
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| 22 | speaker_id_desc = gpiod_get_index(dev, NULL, idx: fixed_gpio_id, flags: GPIOD_IN); |
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| 23 | if (IS_ERR(ptr: speaker_id_desc)) { |
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| 24 | speaker_id = PTR_ERR(ptr: speaker_id_desc); |
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| 25 | return speaker_id; |
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| 26 | } |
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| 27 | speaker_id = gpiod_get_value_cansleep(desc: speaker_id_desc); |
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| 28 | gpiod_put(desc: speaker_id_desc); |
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| 29 | } else { |
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| 30 | int base_index; |
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| 31 | int gpios_per_amp; |
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| 32 | int count; |
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| 33 | int tmp; |
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| 34 | int i; |
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| 35 | |
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| 36 | count = gpiod_count(dev, con_id: "spk-id" ); |
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| 37 | if (count > 0) { |
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| 38 | speaker_id = 0; |
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| 39 | gpios_per_amp = count / num_amps; |
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| 40 | base_index = gpios_per_amp * amp_index; |
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| 41 | |
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| 42 | if (count % num_amps) |
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| 43 | return -EINVAL; |
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| 44 | |
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| 45 | dev_dbg(dev, "Found %d Speaker ID GPIOs per Amp\n" , gpios_per_amp); |
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| 46 | |
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| 47 | for (i = 0; i < gpios_per_amp; i++) { |
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| 48 | speaker_id_desc = gpiod_get_index(dev, con_id: "spk-id" , idx: i + base_index, |
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| 49 | flags: GPIOD_IN); |
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| 50 | if (IS_ERR(ptr: speaker_id_desc)) { |
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| 51 | speaker_id = PTR_ERR(ptr: speaker_id_desc); |
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| 52 | break; |
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| 53 | } |
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| 54 | tmp = gpiod_get_value_cansleep(desc: speaker_id_desc); |
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| 55 | gpiod_put(desc: speaker_id_desc); |
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| 56 | if (tmp < 0) { |
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| 57 | speaker_id = tmp; |
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| 58 | break; |
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| 59 | } |
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| 60 | speaker_id |= tmp << i; |
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| 61 | } |
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| 62 | } |
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| 63 | } |
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| 64 | |
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| 65 | dev_dbg(dev, "Speaker ID = %d\n" , speaker_id); |
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| 66 | |
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| 67 | return speaker_id; |
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| 68 | } |
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| 69 | EXPORT_SYMBOL_NS_GPL(cirrus_scodec_get_speaker_id, "SND_HDA_CIRRUS_SCODEC" ); |
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| 70 | |
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| 71 | MODULE_DESCRIPTION("HDA Cirrus side-codec library" ); |
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| 72 | MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>" ); |
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| 73 | MODULE_LICENSE("GPL" ); |
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| 74 | |
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