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577 lines
14 KiB
577 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips |
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* |
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* Copyright (c) 2004 Jaroslav Kysela <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <asm/io.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-dev.h> |
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#include <media/v4l2-fh.h> |
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#include <media/v4l2-ioctl.h> |
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#include <media/v4l2-event.h> |
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#include <media/drv-intf/tea575x.h> |
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MODULE_AUTHOR("Jaroslav Kysela <[email protected]>"); |
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MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips"); |
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MODULE_LICENSE("GPL"); |
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/* |
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* definitions |
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*/ |
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#define TEA575X_BIT_SEARCH (1<<24) /* 1 = search action, 0 = tuned */ |
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#define TEA575X_BIT_UPDOWN (1<<23) /* 0 = search down, 1 = search up */ |
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#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */ |
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#define TEA575X_BIT_BAND_MASK (3<<20) |
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#define TEA575X_BIT_BAND_FM (0<<20) |
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#define TEA575X_BIT_BAND_MW (1<<20) |
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#define TEA575X_BIT_BAND_LW (2<<20) |
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#define TEA575X_BIT_BAND_SW (3<<20) |
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#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */ |
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#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */ |
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#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */ |
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#define TEA575X_BIT_SEARCH_5_28 (0<<16) /* FM >5uV, AM >28uV */ |
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#define TEA575X_BIT_SEARCH_10_40 (1<<16) /* FM >10uV, AM > 40uV */ |
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#define TEA575X_BIT_SEARCH_30_63 (2<<16) /* FM >30uV, AM > 63uV */ |
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#define TEA575X_BIT_SEARCH_150_1000 (3<<16) /* FM > 150uV, AM > 1000uV */ |
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#define TEA575X_BIT_DUMMY (1<<15) /* buffer */ |
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#define TEA575X_BIT_FREQ_MASK 0x7fff |
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enum { BAND_FM, BAND_FM_JAPAN, BAND_AM }; |
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static const struct v4l2_frequency_band bands[] = { |
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{ |
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.type = V4L2_TUNER_RADIO, |
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.index = 0, |
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | |
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V4L2_TUNER_CAP_FREQ_BANDS, |
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.rangelow = 87500 * 16, |
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.rangehigh = 108000 * 16, |
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.modulation = V4L2_BAND_MODULATION_FM, |
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}, |
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{ |
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.type = V4L2_TUNER_RADIO, |
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.index = 0, |
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | |
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V4L2_TUNER_CAP_FREQ_BANDS, |
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.rangelow = 76000 * 16, |
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.rangehigh = 91000 * 16, |
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.modulation = V4L2_BAND_MODULATION_FM, |
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}, |
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{ |
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.type = V4L2_TUNER_RADIO, |
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.index = 1, |
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS, |
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.rangelow = 530 * 16, |
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.rangehigh = 1710 * 16, |
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.modulation = V4L2_BAND_MODULATION_AM, |
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}, |
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}; |
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/* |
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* lowlevel part |
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*/ |
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static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val) |
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{ |
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u16 l; |
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u8 data; |
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if (tea->ops->write_val) |
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return tea->ops->write_val(tea, val); |
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tea->ops->set_direction(tea, 1); |
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udelay(16); |
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for (l = 25; l > 0; l--) { |
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data = (val >> 24) & TEA575X_DATA; |
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val <<= 1; /* shift data */ |
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tea->ops->set_pins(tea, data | TEA575X_WREN); |
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udelay(2); |
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tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK); |
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udelay(2); |
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tea->ops->set_pins(tea, data | TEA575X_WREN); |
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udelay(2); |
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} |
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if (!tea->mute) |
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tea->ops->set_pins(tea, 0); |
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} |
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static u32 snd_tea575x_read(struct snd_tea575x *tea) |
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{ |
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u16 l, rdata; |
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u32 data = 0; |
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if (tea->ops->read_val) |
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return tea->ops->read_val(tea); |
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tea->ops->set_direction(tea, 0); |
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tea->ops->set_pins(tea, 0); |
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udelay(16); |
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for (l = 24; l--;) { |
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tea->ops->set_pins(tea, TEA575X_CLK); |
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udelay(2); |
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if (!l) |
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tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1; |
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tea->ops->set_pins(tea, 0); |
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udelay(2); |
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data <<= 1; /* shift data */ |
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rdata = tea->ops->get_pins(tea); |
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if (!l) |
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tea->stereo = (rdata & TEA575X_MOST) ? 0 : 1; |
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if (rdata & TEA575X_DATA) |
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data++; |
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udelay(2); |
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} |
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if (tea->mute) |
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tea->ops->set_pins(tea, TEA575X_WREN); |
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return data; |
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} |
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static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val) |
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{ |
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u32 freq = val & TEA575X_BIT_FREQ_MASK; |
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if (freq == 0) |
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return freq; |
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switch (tea->band) { |
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case BAND_FM: |
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/* freq *= 12.5 */ |
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freq *= 125; |
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freq /= 10; |
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/* crystal fixup */ |
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freq -= TEA575X_FMIF; |
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break; |
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case BAND_FM_JAPAN: |
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/* freq *= 12.5 */ |
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freq *= 125; |
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freq /= 10; |
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/* crystal fixup */ |
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freq += TEA575X_FMIF; |
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break; |
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case BAND_AM: |
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/* crystal fixup */ |
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freq -= TEA575X_AMIF; |
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break; |
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} |
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return clamp(freq * 16, bands[tea->band].rangelow, |
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bands[tea->band].rangehigh); /* from kHz */ |
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} |
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static u32 snd_tea575x_get_freq(struct snd_tea575x *tea) |
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{ |
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return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea)); |
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} |
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void snd_tea575x_set_freq(struct snd_tea575x *tea) |
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{ |
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u32 freq = tea->freq / 16; /* to kHz */ |
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u32 band = 0; |
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switch (tea->band) { |
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case BAND_FM: |
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band = TEA575X_BIT_BAND_FM; |
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/* crystal fixup */ |
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freq += TEA575X_FMIF; |
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/* freq /= 12.5 */ |
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freq *= 10; |
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freq /= 125; |
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break; |
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case BAND_FM_JAPAN: |
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band = TEA575X_BIT_BAND_FM; |
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/* crystal fixup */ |
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freq -= TEA575X_FMIF; |
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/* freq /= 12.5 */ |
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freq *= 10; |
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freq /= 125; |
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break; |
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case BAND_AM: |
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band = TEA575X_BIT_BAND_MW; |
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/* crystal fixup */ |
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freq += TEA575X_AMIF; |
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break; |
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} |
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tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK); |
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tea->val |= band; |
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tea->val |= freq & TEA575X_BIT_FREQ_MASK; |
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snd_tea575x_write(tea, tea->val); |
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tea->freq = snd_tea575x_val_to_freq(tea, tea->val); |
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} |
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EXPORT_SYMBOL(snd_tea575x_set_freq); |
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/* |
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* Linux Video interface |
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*/ |
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static int vidioc_querycap(struct file *file, void *priv, |
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struct v4l2_capability *v) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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strscpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver)); |
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strscpy(v->card, tea->card, sizeof(v->card)); |
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strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card)); |
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strscpy(v->bus_info, tea->bus_info, sizeof(v->bus_info)); |
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return 0; |
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} |
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int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea, |
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struct v4l2_frequency_band *band) |
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{ |
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int index; |
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if (band->tuner != 0) |
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return -EINVAL; |
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switch (band->index) { |
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case 0: |
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if (tea->tea5759) |
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index = BAND_FM_JAPAN; |
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else |
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index = BAND_FM; |
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break; |
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case 1: |
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if (tea->has_am) { |
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index = BAND_AM; |
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break; |
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} |
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fallthrough; |
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default: |
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return -EINVAL; |
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} |
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*band = bands[index]; |
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if (!tea->cannot_read_data) |
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band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED; |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_tea575x_enum_freq_bands); |
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static int vidioc_enum_freq_bands(struct file *file, void *priv, |
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struct v4l2_frequency_band *band) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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return snd_tea575x_enum_freq_bands(tea, band); |
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} |
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int snd_tea575x_g_tuner(struct snd_tea575x *tea, struct v4l2_tuner *v) |
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{ |
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struct v4l2_frequency_band band_fm = { 0, }; |
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if (v->index > 0) |
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return -EINVAL; |
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snd_tea575x_read(tea); |
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snd_tea575x_enum_freq_bands(tea, &band_fm); |
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memset(v, 0, sizeof(*v)); |
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strscpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name)); |
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v->type = V4L2_TUNER_RADIO; |
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v->capability = band_fm.capability; |
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v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow; |
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v->rangehigh = band_fm.rangehigh; |
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v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO; |
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v->audmode = (tea->val & TEA575X_BIT_MONO) ? |
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V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO; |
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v->signal = tea->tuned ? 0xffff : 0; |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_tea575x_g_tuner); |
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static int vidioc_g_tuner(struct file *file, void *priv, |
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struct v4l2_tuner *v) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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return snd_tea575x_g_tuner(tea, v); |
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} |
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static int vidioc_s_tuner(struct file *file, void *priv, |
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const struct v4l2_tuner *v) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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u32 orig_val = tea->val; |
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if (v->index) |
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return -EINVAL; |
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tea->val &= ~TEA575X_BIT_MONO; |
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if (v->audmode == V4L2_TUNER_MODE_MONO) |
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tea->val |= TEA575X_BIT_MONO; |
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/* Only apply changes if currently tuning FM */ |
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if (tea->band != BAND_AM && tea->val != orig_val) |
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snd_tea575x_set_freq(tea); |
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return 0; |
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} |
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static int vidioc_g_frequency(struct file *file, void *priv, |
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struct v4l2_frequency *f) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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if (f->tuner != 0) |
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return -EINVAL; |
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f->type = V4L2_TUNER_RADIO; |
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f->frequency = tea->freq; |
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return 0; |
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} |
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static int vidioc_s_frequency(struct file *file, void *priv, |
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const struct v4l2_frequency *f) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) |
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return -EINVAL; |
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if (tea->has_am && f->frequency < (20000 * 16)) |
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tea->band = BAND_AM; |
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else if (tea->tea5759) |
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tea->band = BAND_FM_JAPAN; |
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else |
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tea->band = BAND_FM; |
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tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow, |
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bands[tea->band].rangehigh); |
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snd_tea575x_set_freq(tea); |
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return 0; |
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} |
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int snd_tea575x_s_hw_freq_seek(struct file *file, struct snd_tea575x *tea, |
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const struct v4l2_hw_freq_seek *a) |
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{ |
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unsigned long timeout; |
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int i, spacing; |
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if (tea->cannot_read_data) |
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return -ENOTTY; |
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if (a->tuner || a->wrap_around) |
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return -EINVAL; |
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if (file->f_flags & O_NONBLOCK) |
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return -EWOULDBLOCK; |
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if (a->rangelow || a->rangehigh) { |
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for (i = 0; i < ARRAY_SIZE(bands); i++) { |
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if ((i == BAND_FM && tea->tea5759) || |
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(i == BAND_FM_JAPAN && !tea->tea5759) || |
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(i == BAND_AM && !tea->has_am)) |
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continue; |
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if (bands[i].rangelow == a->rangelow && |
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bands[i].rangehigh == a->rangehigh) |
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break; |
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} |
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if (i == ARRAY_SIZE(bands)) |
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return -EINVAL; /* No matching band found */ |
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if (i != tea->band) { |
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tea->band = i; |
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tea->freq = clamp(tea->freq, bands[i].rangelow, |
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bands[i].rangehigh); |
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snd_tea575x_set_freq(tea); |
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} |
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} |
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spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */ |
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/* clear the frequency, HW will fill it in */ |
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tea->val &= ~TEA575X_BIT_FREQ_MASK; |
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tea->val |= TEA575X_BIT_SEARCH; |
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if (a->seek_upward) |
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tea->val |= TEA575X_BIT_UPDOWN; |
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else |
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tea->val &= ~TEA575X_BIT_UPDOWN; |
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snd_tea575x_write(tea, tea->val); |
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timeout = jiffies + msecs_to_jiffies(10000); |
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for (;;) { |
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if (time_after(jiffies, timeout)) |
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break; |
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if (schedule_timeout_interruptible(msecs_to_jiffies(10))) { |
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/* some signal arrived, stop search */ |
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tea->val &= ~TEA575X_BIT_SEARCH; |
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snd_tea575x_set_freq(tea); |
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return -ERESTARTSYS; |
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} |
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if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) { |
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u32 freq; |
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/* Found a frequency, wait until it can be read */ |
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for (i = 0; i < 100; i++) { |
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msleep(10); |
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freq = snd_tea575x_get_freq(tea); |
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if (freq) /* available */ |
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break; |
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} |
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if (freq == 0) /* shouldn't happen */ |
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break; |
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/* |
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* if we moved by less than the spacing, or in the |
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* wrong direction, continue seeking |
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*/ |
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if (abs(tea->freq - freq) < 16 * spacing || |
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(a->seek_upward && freq < tea->freq) || |
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(!a->seek_upward && freq > tea->freq)) { |
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snd_tea575x_write(tea, tea->val); |
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continue; |
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} |
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tea->freq = freq; |
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tea->val &= ~TEA575X_BIT_SEARCH; |
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return 0; |
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} |
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} |
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tea->val &= ~TEA575X_BIT_SEARCH; |
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snd_tea575x_set_freq(tea); |
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return -ENODATA; |
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} |
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EXPORT_SYMBOL(snd_tea575x_s_hw_freq_seek); |
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static int vidioc_s_hw_freq_seek(struct file *file, void *fh, |
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const struct v4l2_hw_freq_seek *a) |
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{ |
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struct snd_tea575x *tea = video_drvdata(file); |
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return snd_tea575x_s_hw_freq_seek(file, tea, a); |
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} |
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static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl) |
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{ |
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struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler); |
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switch (ctrl->id) { |
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case V4L2_CID_AUDIO_MUTE: |
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tea->mute = ctrl->val; |
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snd_tea575x_set_freq(tea); |
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return 0; |
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} |
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return -EINVAL; |
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} |
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static const struct v4l2_file_operations tea575x_fops = { |
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.unlocked_ioctl = video_ioctl2, |
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.open = v4l2_fh_open, |
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.release = v4l2_fh_release, |
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.poll = v4l2_ctrl_poll, |
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}; |
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static const struct v4l2_ioctl_ops tea575x_ioctl_ops = { |
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.vidioc_querycap = vidioc_querycap, |
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.vidioc_g_tuner = vidioc_g_tuner, |
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.vidioc_s_tuner = vidioc_s_tuner, |
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.vidioc_g_frequency = vidioc_g_frequency, |
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.vidioc_s_frequency = vidioc_s_frequency, |
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.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek, |
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.vidioc_enum_freq_bands = vidioc_enum_freq_bands, |
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.vidioc_log_status = v4l2_ctrl_log_status, |
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event, |
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe, |
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}; |
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static const struct video_device tea575x_radio = { |
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.ioctl_ops = &tea575x_ioctl_ops, |
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.release = video_device_release_empty, |
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}; |
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static const struct v4l2_ctrl_ops tea575x_ctrl_ops = { |
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.s_ctrl = tea575x_s_ctrl, |
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}; |
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int snd_tea575x_hw_init(struct snd_tea575x *tea) |
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{ |
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tea->mute = true; |
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/* Not all devices can or know how to read the data back. |
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Such devices can set cannot_read_data to true. */ |
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if (!tea->cannot_read_data) { |
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snd_tea575x_write(tea, 0x55AA); |
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if (snd_tea575x_read(tea) != 0x55AA) |
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return -ENODEV; |
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} |
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tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28; |
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tea->freq = 90500 * 16; /* 90.5Mhz default */ |
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snd_tea575x_set_freq(tea); |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_tea575x_hw_init); |
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int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner) |
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{ |
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int retval = snd_tea575x_hw_init(tea); |
|
|
|
if (retval) |
|
return retval; |
|
|
|
tea->vd = tea575x_radio; |
|
video_set_drvdata(&tea->vd, tea); |
|
mutex_init(&tea->mutex); |
|
strscpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name)); |
|
tea->vd.lock = &tea->mutex; |
|
tea->vd.v4l2_dev = tea->v4l2_dev; |
|
tea->vd.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO; |
|
if (!tea->cannot_read_data) |
|
tea->vd.device_caps |= V4L2_CAP_HW_FREQ_SEEK; |
|
tea->fops = tea575x_fops; |
|
tea->fops.owner = owner; |
|
tea->vd.fops = &tea->fops; |
|
/* disable hw_freq_seek if we can't use it */ |
|
if (tea->cannot_read_data) |
|
v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK); |
|
|
|
if (!tea->cannot_mute) { |
|
tea->vd.ctrl_handler = &tea->ctrl_handler; |
|
v4l2_ctrl_handler_init(&tea->ctrl_handler, 1); |
|
v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops, |
|
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); |
|
retval = tea->ctrl_handler.error; |
|
if (retval) { |
|
v4l2_err(tea->v4l2_dev, "can't initialize controls\n"); |
|
v4l2_ctrl_handler_free(&tea->ctrl_handler); |
|
return retval; |
|
} |
|
|
|
if (tea->ext_init) { |
|
retval = tea->ext_init(tea); |
|
if (retval) { |
|
v4l2_ctrl_handler_free(&tea->ctrl_handler); |
|
return retval; |
|
} |
|
} |
|
|
|
v4l2_ctrl_handler_setup(&tea->ctrl_handler); |
|
} |
|
|
|
retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr); |
|
if (retval) { |
|
v4l2_err(tea->v4l2_dev, "can't register video device!\n"); |
|
v4l2_ctrl_handler_free(tea->vd.ctrl_handler); |
|
return retval; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(snd_tea575x_init); |
|
|
|
void snd_tea575x_exit(struct snd_tea575x *tea) |
|
{ |
|
video_unregister_device(&tea->vd); |
|
v4l2_ctrl_handler_free(tea->vd.ctrl_handler); |
|
} |
|
EXPORT_SYMBOL(snd_tea575x_exit);
|
|
|