370 lines
8.9 KiB
C
370 lines
8.9 KiB
C
/*
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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 <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <asm/io.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/version.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-ioctl.h>
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#include <sound/tea575x-tuner.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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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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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
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#define FREQ_LO (50UL * 16000)
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#define FREQ_HI (150UL * 16000)
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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 (1<<21)
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#define TEA575X_BIT_BAND_SW (1<<22)
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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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/*
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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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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 unsigned int 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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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 void snd_tea575x_get_freq(struct snd_tea575x *tea)
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{
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unsigned long freq;
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freq = snd_tea575x_read(tea) & TEA575X_BIT_FREQ_MASK;
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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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if (tea->tea5759)
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freq += TEA575X_FMIF;
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else
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freq -= TEA575X_FMIF;
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tea->freq = freq * 16; /* from kHz */
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}
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static void snd_tea575x_set_freq(struct snd_tea575x *tea)
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{
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unsigned long freq;
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freq = clamp(tea->freq, FREQ_LO, FREQ_HI);
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freq /= 16; /* to kHz */
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/* crystal fixup */
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if (tea->tea5759)
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freq -= TEA575X_FMIF;
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else
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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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tea->val &= ~TEA575X_BIT_FREQ_MASK;
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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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}
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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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strlcpy(v->driver, "tea575x-tuner", sizeof(v->driver));
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strlcpy(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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strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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return 0;
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}
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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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if (v->index > 0)
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return -EINVAL;
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snd_tea575x_read(tea);
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strcpy(v->name, "FM");
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v->type = V4L2_TUNER_RADIO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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v->rangelow = FREQ_LO;
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v->rangehigh = FREQ_HI;
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v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
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v->audmode = tea->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
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v->signal = tea->tuned ? 0xffff : 0;
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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if (v->index > 0)
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return -EINVAL;
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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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snd_tea575x_get_freq(tea);
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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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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 (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
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return -EINVAL;
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tea->freq = f->frequency;
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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_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index > 1)
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return -EINVAL;
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strcpy(a->name, "Radio");
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index != 0)
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return -EINVAL;
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return 0;
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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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.owner = THIS_MODULE,
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.unlocked_ioctl = video_ioctl2,
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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_audio = vidioc_g_audio,
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.vidioc_s_audio = vidioc_s_audio,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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};
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static struct video_device tea575x_radio = {
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.name = "tea575x-tuner",
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.fops = &tea575x_fops,
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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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/*
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* initialize all the tea575x chips
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*/
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int snd_tea575x_init(struct snd_tea575x *tea)
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{
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int retval;
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tea->mute = 1;
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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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tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
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tea->freq = 90500 * 16; /* 90.5Mhz default */
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snd_tea575x_set_freq(tea);
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tea->vd = tea575x_radio;
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video_set_drvdata(&tea->vd, tea);
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mutex_init(&tea->mutex);
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tea->vd.lock = &tea->mutex;
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v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
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tea->vd.ctrl_handler = &tea->ctrl_handler;
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v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops, V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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retval = tea->ctrl_handler.error;
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if (retval) {
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printk(KERN_ERR "tea575x-tuner: can't initialize controls\n");
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v4l2_ctrl_handler_free(&tea->ctrl_handler);
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return retval;
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}
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if (tea->ext_init) {
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retval = tea->ext_init(tea);
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if (retval) {
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v4l2_ctrl_handler_free(&tea->ctrl_handler);
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return retval;
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}
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}
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v4l2_ctrl_handler_setup(&tea->ctrl_handler);
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retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, radio_nr);
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if (retval) {
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printk(KERN_ERR "tea575x-tuner: can't register video device!\n");
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v4l2_ctrl_handler_free(&tea->ctrl_handler);
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return retval;
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}
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return 0;
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}
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void snd_tea575x_exit(struct snd_tea575x *tea)
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{
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video_unregister_device(&tea->vd);
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v4l2_ctrl_handler_free(&tea->ctrl_handler);
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}
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static int __init alsa_tea575x_module_init(void)
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{
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return 0;
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}
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static void __exit alsa_tea575x_module_exit(void)
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{
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}
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module_init(alsa_tea575x_module_init)
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module_exit(alsa_tea575x_module_exit)
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EXPORT_SYMBOL(snd_tea575x_init);
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EXPORT_SYMBOL(snd_tea575x_exit);
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