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path: root/drivers/media/radio/tea575x.c
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Diffstat (limited to 'drivers/media/radio/tea575x.c')
-rw-r--r--drivers/media/radio/tea575x.c584
1 files changed, 584 insertions, 0 deletions
diff --git a/drivers/media/radio/tea575x.c b/drivers/media/radio/tea575x.c
new file mode 100644
index 000000000000..cef06981b7c9
--- /dev/null
+++ b/drivers/media/radio/tea575x.c
@@ -0,0 +1,584 @@
+/*
+ * ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
+ *
+ * Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
+#include <media/tea575x.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
+MODULE_LICENSE("GPL");
+
+/*
+ * definitions
+ */
+
+#define TEA575X_BIT_SEARCH (1<<24) /* 1 = search action, 0 = tuned */
+#define TEA575X_BIT_UPDOWN (1<<23) /* 0 = search down, 1 = search up */
+#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */
+#define TEA575X_BIT_BAND_MASK (3<<20)
+#define TEA575X_BIT_BAND_FM (0<<20)
+#define TEA575X_BIT_BAND_MW (1<<20)
+#define TEA575X_BIT_BAND_LW (2<<20)
+#define TEA575X_BIT_BAND_SW (3<<20)
+#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
+#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
+#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
+#define TEA575X_BIT_SEARCH_5_28 (0<<16) /* FM >5uV, AM >28uV */
+#define TEA575X_BIT_SEARCH_10_40 (1<<16) /* FM >10uV, AM > 40uV */
+#define TEA575X_BIT_SEARCH_30_63 (2<<16) /* FM >30uV, AM > 63uV */
+#define TEA575X_BIT_SEARCH_150_1000 (3<<16) /* FM > 150uV, AM > 1000uV */
+#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
+#define TEA575X_BIT_FREQ_MASK 0x7fff
+
+enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };
+
+static const struct v4l2_frequency_band bands[] = {
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 0,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+ V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = 87500 * 16,
+ .rangehigh = 108000 * 16,
+ .modulation = V4L2_BAND_MODULATION_FM,
+ },
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 0,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
+ V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = 76000 * 16,
+ .rangehigh = 91000 * 16,
+ .modulation = V4L2_BAND_MODULATION_FM,
+ },
+ {
+ .type = V4L2_TUNER_RADIO,
+ .index = 1,
+ .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
+ .rangelow = 530 * 16,
+ .rangehigh = 1710 * 16,
+ .modulation = V4L2_BAND_MODULATION_AM,
+ },
+};
+
+/*
+ * lowlevel part
+ */
+
+static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
+{
+ u16 l;
+ u8 data;
+
+ if (tea->ops->write_val)
+ return tea->ops->write_val(tea, val);
+
+ tea->ops->set_direction(tea, 1);
+ udelay(16);
+
+ for (l = 25; l > 0; l--) {
+ data = (val >> 24) & TEA575X_DATA;
+ val <<= 1; /* shift data */
+ tea->ops->set_pins(tea, data | TEA575X_WREN);
+ udelay(2);
+ tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
+ udelay(2);
+ tea->ops->set_pins(tea, data | TEA575X_WREN);
+ udelay(2);
+ }
+
+ if (!tea->mute)
+ tea->ops->set_pins(tea, 0);
+}
+
+static u32 snd_tea575x_read(struct snd_tea575x *tea)
+{
+ u16 l, rdata;
+ u32 data = 0;
+
+ if (tea->ops->read_val)
+ return tea->ops->read_val(tea);
+
+ tea->ops->set_direction(tea, 0);
+ tea->ops->set_pins(tea, 0);
+ udelay(16);
+
+ for (l = 24; l--;) {
+ tea->ops->set_pins(tea, TEA575X_CLK);
+ udelay(2);
+ if (!l)
+ tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
+ tea->ops->set_pins(tea, 0);
+ udelay(2);
+ data <<= 1; /* shift data */
+ rdata = tea->ops->get_pins(tea);
+ if (!l)
+ tea->stereo = (rdata & TEA575X_MOST) ? 0 : 1;
+ if (rdata & TEA575X_DATA)
+ data++;
+ udelay(2);
+ }
+
+ if (tea->mute)
+ tea->ops->set_pins(tea, TEA575X_WREN);
+
+ return data;
+}
+
+static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
+{
+ u32 freq = val & TEA575X_BIT_FREQ_MASK;
+
+ if (freq == 0)
+ return freq;
+
+ switch (tea->band) {
+ case BAND_FM:
+ /* freq *= 12.5 */
+ freq *= 125;
+ freq /= 10;
+ /* crystal fixup */
+ freq -= TEA575X_FMIF;
+ break;
+ case BAND_FM_JAPAN:
+ /* freq *= 12.5 */
+ freq *= 125;
+ freq /= 10;
+ /* crystal fixup */
+ freq += TEA575X_FMIF;
+ break;
+ case BAND_AM:
+ /* crystal fixup */
+ freq -= TEA575X_AMIF;
+ break;
+ }
+
+ return clamp(freq * 16, bands[tea->band].rangelow,
+ bands[tea->band].rangehigh); /* from kHz */
+}
+
+static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
+{
+ return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea));
+}
+
+void snd_tea575x_set_freq(struct snd_tea575x *tea)
+{
+ u32 freq = tea->freq / 16; /* to kHz */
+ u32 band = 0;
+
+ switch (tea->band) {
+ case BAND_FM:
+ band = TEA575X_BIT_BAND_FM;
+ /* crystal fixup */
+ freq += TEA575X_FMIF;
+ /* freq /= 12.5 */
+ freq *= 10;
+ freq /= 125;
+ break;
+ case BAND_FM_JAPAN:
+ band = TEA575X_BIT_BAND_FM;
+ /* crystal fixup */
+ freq -= TEA575X_FMIF;
+ /* freq /= 12.5 */
+ freq *= 10;
+ freq /= 125;
+ break;
+ case BAND_AM:
+ band = TEA575X_BIT_BAND_MW;
+ /* crystal fixup */
+ freq += TEA575X_AMIF;
+ break;
+ }
+
+ tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
+ tea->val |= band;
+ tea->val |= freq & TEA575X_BIT_FREQ_MASK;
+ snd_tea575x_write(tea, tea->val);
+ tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
+}
+
+/*
+ * Linux Video interface
+ */
+
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *v)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+
+ strlcpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
+ strlcpy(v->card, tea->card, sizeof(v->card));
+ strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
+ strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
+ v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ if (!tea->cannot_read_data)
+ v->device_caps |= V4L2_CAP_HW_FREQ_SEEK;
+ v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
+ return 0;
+}
+
+static int vidioc_enum_freq_bands(struct file *file, void *priv,
+ struct v4l2_frequency_band *band)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+ int index;
+
+ if (band->tuner != 0)
+ return -EINVAL;
+
+ switch (band->index) {
+ case 0:
+ if (tea->tea5759)
+ index = BAND_FM_JAPAN;
+ else
+ index = BAND_FM;
+ break;
+ case 1:
+ if (tea->has_am) {
+ index = BAND_AM;
+ break;
+ }
+ /* Fall through */
+ default:
+ return -EINVAL;
+ }
+
+ *band = bands[index];
+ if (!tea->cannot_read_data)
+ band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
+
+ return 0;
+}
+
+static int vidioc_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+ struct v4l2_frequency_band band_fm = { 0, };
+
+ if (v->index > 0)
+ return -EINVAL;
+
+ snd_tea575x_read(tea);
+ vidioc_enum_freq_bands(file, priv, &band_fm);
+
+ memset(v, 0, sizeof(*v));
+ strlcpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
+ v->type = V4L2_TUNER_RADIO;
+ v->capability = band_fm.capability;
+ v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
+ v->rangehigh = band_fm.rangehigh;
+ v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
+ v->audmode = (tea->val & TEA575X_BIT_MONO) ?
+ V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
+ v->signal = tea->tuned ? 0xffff : 0;
+ return 0;
+}
+
+static int vidioc_s_tuner(struct file *file, void *priv,
+ const struct v4l2_tuner *v)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+ u32 orig_val = tea->val;
+
+ if (v->index)
+ return -EINVAL;
+ tea->val &= ~TEA575X_BIT_MONO;
+ if (v->audmode == V4L2_TUNER_MODE_MONO)
+ tea->val |= TEA575X_BIT_MONO;
+ /* Only apply changes if currently tuning FM */
+ if (tea->band != BAND_AM && tea->val != orig_val)
+ snd_tea575x_set_freq(tea);
+
+ return 0;
+}
+
+static int vidioc_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+
+ if (f->tuner != 0)
+ return -EINVAL;
+ f->type = V4L2_TUNER_RADIO;
+ f->frequency = tea->freq;
+ return 0;
+}
+
+static int vidioc_s_frequency(struct file *file, void *priv,
+ const struct v4l2_frequency *f)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+
+ if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+ return -EINVAL;
+
+ if (tea->has_am && f->frequency < (20000 * 16))
+ tea->band = BAND_AM;
+ else if (tea->tea5759)
+ tea->band = BAND_FM_JAPAN;
+ else
+ tea->band = BAND_FM;
+
+ tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow,
+ bands[tea->band].rangehigh);
+ snd_tea575x_set_freq(tea);
+ return 0;
+}
+
+static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
+ const struct v4l2_hw_freq_seek *a)
+{
+ struct snd_tea575x *tea = video_drvdata(file);
+ unsigned long timeout;
+ int i, spacing;
+
+ if (tea->cannot_read_data)
+ return -ENOTTY;
+ if (a->tuner || a->wrap_around)
+ return -EINVAL;
+
+ if (file->f_flags & O_NONBLOCK)
+ return -EWOULDBLOCK;
+
+ if (a->rangelow || a->rangehigh) {
+ for (i = 0; i < ARRAY_SIZE(bands); i++) {
+ if ((i == BAND_FM && tea->tea5759) ||
+ (i == BAND_FM_JAPAN && !tea->tea5759) ||
+ (i == BAND_AM && !tea->has_am))
+ continue;
+ if (bands[i].rangelow == a->rangelow &&
+ bands[i].rangehigh == a->rangehigh)
+ break;
+ }
+ if (i == ARRAY_SIZE(bands))
+ return -EINVAL; /* No matching band found */
+ if (i != tea->band) {
+ tea->band = i;
+ tea->freq = clamp(tea->freq, bands[i].rangelow,
+ bands[i].rangehigh);
+ snd_tea575x_set_freq(tea);
+ }
+ }
+
+ spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */
+
+ /* clear the frequency, HW will fill it in */
+ tea->val &= ~TEA575X_BIT_FREQ_MASK;
+ tea->val |= TEA575X_BIT_SEARCH;
+ if (a->seek_upward)
+ tea->val |= TEA575X_BIT_UPDOWN;
+ else
+ tea->val &= ~TEA575X_BIT_UPDOWN;
+ snd_tea575x_write(tea, tea->val);
+ timeout = jiffies + msecs_to_jiffies(10000);
+ for (;;) {
+ if (time_after(jiffies, timeout))
+ break;
+ if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
+ /* some signal arrived, stop search */
+ tea->val &= ~TEA575X_BIT_SEARCH;
+ snd_tea575x_set_freq(tea);
+ return -ERESTARTSYS;
+ }
+ if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
+ u32 freq;
+
+ /* Found a frequency, wait until it can be read */
+ for (i = 0; i < 100; i++) {
+ msleep(10);
+ freq = snd_tea575x_get_freq(tea);
+ if (freq) /* available */
+ break;
+ }
+ if (freq == 0) /* shouldn't happen */
+ break;
+ /*
+ * if we moved by less than the spacing, or in the
+ * wrong direction, continue seeking
+ */
+ if (abs(tea->freq - freq) < 16 * spacing ||
+ (a->seek_upward && freq < tea->freq) ||
+ (!a->seek_upward && freq > tea->freq)) {
+ snd_tea575x_write(tea, tea->val);
+ continue;
+ }
+ tea->freq = freq;
+ tea->val &= ~TEA575X_BIT_SEARCH;
+ return 0;
+ }
+ }
+ tea->val &= ~TEA575X_BIT_SEARCH;
+ snd_tea575x_set_freq(tea);
+ return -ENODATA;
+}
+
+static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ tea->mute = ctrl->val;
+ snd_tea575x_set_freq(tea);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static const struct v4l2_file_operations tea575x_fops = {
+ .unlocked_ioctl = video_ioctl2,
+ .open = v4l2_fh_open,
+ .release = v4l2_fh_release,
+ .poll = v4l2_ctrl_poll,
+};
+
+static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+ .vidioc_g_tuner = vidioc_g_tuner,
+ .vidioc_s_tuner = vidioc_s_tuner,
+ .vidioc_g_frequency = vidioc_g_frequency,
+ .vidioc_s_frequency = vidioc_s_frequency,
+ .vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
+ .vidioc_enum_freq_bands = vidioc_enum_freq_bands,
+ .vidioc_log_status = v4l2_ctrl_log_status,
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static const struct video_device tea575x_radio = {
+ .ioctl_ops = &tea575x_ioctl_ops,
+ .release = video_device_release_empty,
+};
+
+static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
+ .s_ctrl = tea575x_s_ctrl,
+};
+
+
+int snd_tea575x_hw_init(struct snd_tea575x *tea)
+{
+ tea->mute = true;
+
+ /* Not all devices can or know how to read the data back.
+ Such devices can set cannot_read_data to true. */
+ if (!tea->cannot_read_data) {
+ snd_tea575x_write(tea, 0x55AA);
+ if (snd_tea575x_read(tea) != 0x55AA)
+ return -ENODEV;
+ }
+
+ tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28;
+ tea->freq = 90500 * 16; /* 90.5Mhz default */
+ snd_tea575x_set_freq(tea);
+
+ return 0;
+}
+EXPORT_SYMBOL(snd_tea575x_hw_init);
+
+int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner)
+{
+ 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);
+ strlcpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
+ tea->vd.lock = &tea->mutex;
+ tea->vd.v4l2_dev = tea->v4l2_dev;
+ tea->fops = tea575x_fops;
+ tea->fops.owner = owner;
+ tea->vd.fops = &tea->fops;
+ set_bit(V4L2_FL_USE_FH_PRIO, &tea->vd.flags);
+ /* 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;
+}
+
+void snd_tea575x_exit(struct snd_tea575x *tea)
+{
+ video_unregister_device(&tea->vd);
+ v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
+}
+
+static int __init alsa_tea575x_module_init(void)
+{
+ return 0;
+}
+
+static void __exit alsa_tea575x_module_exit(void)
+{
+}
+
+module_init(alsa_tea575x_module_init)
+module_exit(alsa_tea575x_module_exit)
+
+EXPORT_SYMBOL(snd_tea575x_init);
+EXPORT_SYMBOL(snd_tea575x_exit);
+EXPORT_SYMBOL(snd_tea575x_set_freq);
generated by cgit (git 2.34.1) at 2024-05-22 16:23:27 +0000