--- /dev/null
+/*
+ * driver/media/radio/radio-tea5764.c
+ *
+ * Driver for TEA5764 radio chip for linux 2.6.
+ * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
+ * The I2C protocol is used for communicate with chip.
+ *
+ * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
+ *
+ * Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
+ *
+ * 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
+ *
+ * History:
+ * 2008-12-06 Fabio Belavenuto <belavenuto@gmail.com>
+ * initial code
+ *
+ * TODO:
+ * add platform_data support for IRQs platform dependencies
+ * add RDS support
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h> /* Initdata */
+#include <linux/videodev2.h> /* kernel radio structs */
+#include <linux/i2c.h> /* I2C */
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <linux/version.h> /* for KERNEL_VERSION MACRO */
+
+#define DRIVER_VERSION "v0.01"
+#define RADIO_VERSION KERNEL_VERSION(0, 0, 1)
+
+#define DRIVER_AUTHOR "Fabio Belavenuto <belavenuto@gmail.com>"
+#define DRIVER_DESC "A driver for the TEA5764 radio chip for EZX Phones."
+
+#define PINFO(format, ...)\
+ printk(KERN_INFO KBUILD_MODNAME ": "\
+ DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
+#define PWARN(format, ...)\
+ printk(KERN_WARNING KBUILD_MODNAME ": "\
+ DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
+# define PDEBUG(format, ...)\
+ printk(KERN_DEBUG KBUILD_MODNAME ": "\
+ DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
+
+/* Frequency limits in MHz -- these are European values. For Japanese
+devices, that would be 76000 and 91000. */
+#define FREQ_MIN 87500
+#define FREQ_MAX 108000
+#define FREQ_MUL 16
+
+/* TEA5764 registers */
+#define TEA5764_MANID 0x002b
+#define TEA5764_CHIPID 0x5764
+
+#define TEA5764_INTREG_BLMSK 0x0001
+#define TEA5764_INTREG_FRRMSK 0x0002
+#define TEA5764_INTREG_LEVMSK 0x0008
+#define TEA5764_INTREG_IFMSK 0x0010
+#define TEA5764_INTREG_BLMFLAG 0x0100
+#define TEA5764_INTREG_FRRFLAG 0x0200
+#define TEA5764_INTREG_LEVFLAG 0x0800
+#define TEA5764_INTREG_IFFLAG 0x1000
+
+#define TEA5764_FRQSET_SUD 0x8000
+#define TEA5764_FRQSET_SM 0x4000
+
+#define TEA5764_TNCTRL_PUPD1 0x8000
+#define TEA5764_TNCTRL_PUPD0 0x4000
+#define TEA5764_TNCTRL_BLIM 0x2000
+#define TEA5764_TNCTRL_SWPM 0x1000
+#define TEA5764_TNCTRL_IFCTC 0x0800
+#define TEA5764_TNCTRL_AFM 0x0400
+#define TEA5764_TNCTRL_SMUTE 0x0200
+#define TEA5764_TNCTRL_SNC 0x0100
+#define TEA5764_TNCTRL_MU 0x0080
+#define TEA5764_TNCTRL_SSL1 0x0040
+#define TEA5764_TNCTRL_SSL0 0x0020
+#define TEA5764_TNCTRL_HLSI 0x0010
+#define TEA5764_TNCTRL_MST 0x0008
+#define TEA5764_TNCTRL_SWP 0x0004
+#define TEA5764_TNCTRL_DTC 0x0002
+#define TEA5764_TNCTRL_AHLSI 0x0001
+
+#define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
+#define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
+#define TEA5764_TUNCHK_TUNTO 0x0100
+#define TEA5764_TUNCHK_LD 0x0008
+#define TEA5764_TUNCHK_STEREO 0x0004
+
+#define TEA5764_TESTREG_TRIGFR 0x0800
+
+struct tea5764_regs {
+ u16 intreg; /* INTFLAG & INTMSK */
+ u16 frqset; /* FRQSETMSB & FRQSETLSB */
+ u16 tnctrl; /* TNCTRL1 & TNCTRL2 */
+ u16 frqchk; /* FRQCHKMSB & FRQCHKLSB */
+ u16 tunchk; /* IFCHK & LEVCHK */
+ u16 testreg; /* TESTBITS & TESTMODE */
+ u16 rdsstat; /* RDSSTAT1 & RDSSTAT2 */
+ u16 rdslb; /* RDSLBMSB & RDSLBLSB */
+ u16 rdspb; /* RDSPBMSB & RDSPBLSB */
+ u16 rdsbc; /* RDSBBC & RDSGBC */
+ u16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */
+ u16 rdsbbl; /* PAUSEDET & RDSBBL */
+ u16 manid; /* MANID1 & MANID2 */
+ u16 chipid; /* CHIPID1 & CHIPID2 */
+} __attribute__ ((packed));
+
+struct tea5764_write_regs {
+ u8 intreg; /* INTMSK */
+ u16 frqset; /* FRQSETMSB & FRQSETLSB */
+ u16 tnctrl; /* TNCTRL1 & TNCTRL2 */
+ u16 testreg; /* TESTBITS & TESTMODE */
+ u16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */
+ u16 rdsbbl; /* PAUSEDET & RDSBBL */
+} __attribute__ ((packed));
+
+#ifndef RADIO_TEA5764_XTAL
+#define RADIO_TEA5764_XTAL 1
+#endif
+
+static int radio_nr = -1;
+static int use_xtal = RADIO_TEA5764_XTAL;
+
+struct tea5764_device {
+ struct i2c_client *i2c_client;
+ struct video_device *videodev;
+ struct tea5764_regs regs;
+ struct mutex mutex;
+ int users;
+};
+
+/* I2C code related */
+int tea5764_i2c_read(struct tea5764_device *radio)
+{
+ int i;
+ u16 *p = (u16 *) &radio->regs;
+
+ struct i2c_msg msgs[1] = {
+ { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs),
+ (void *)&radio->regs },
+ };
+ if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
+ return -EIO;
+ for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
+ p[i] = __be16_to_cpu(p[i]);
+
+ return 0;
+}
+
+int tea5764_i2c_write(struct tea5764_device *radio)
+{
+ struct tea5764_write_regs wr;
+ struct tea5764_regs *r = &radio->regs;
+ struct i2c_msg msgs[1] = {
+ { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr },
+ };
+ wr.intreg = r->intreg & 0xff;
+ wr.frqset = __cpu_to_be16(r->frqset);
+ wr.tnctrl = __cpu_to_be16(r->tnctrl);
+ wr.testreg = __cpu_to_be16(r->testreg);
+ wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
+ wr.rdsbbl = __cpu_to_be16(r->rdsbbl);
+ if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
+ return -EIO;
+ return 0;
+}
+
+/* V4L2 code related */
+static struct v4l2_queryctrl radio_qctrl[] = {
+ {
+ .id = V4L2_CID_AUDIO_MUTE,
+ .name = "Mute",
+ .minimum = 0,
+ .maximum = 1,
+ .default_value = 1,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ }
+};
+
+static void tea5764_power_up(struct tea5764_device *radio)
+{
+ struct tea5764_regs *r = &radio->regs;
+
+ if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
+ r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
+ TEA5764_TNCTRL_HLSI);
+ if (!use_xtal)
+ r->testreg |= TEA5764_TESTREG_TRIGFR;
+ else
+ r->testreg &= ~TEA5764_TESTREG_TRIGFR;
+
+ r->tnctrl |= TEA5764_TNCTRL_PUPD0;
+ tea5764_i2c_write(radio);
+ }
+}
+
+static void tea5764_power_down(struct tea5764_device *radio)
+{
+ struct tea5764_regs *r = &radio->regs;
+
+ if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
+ r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
+ tea5764_i2c_write(radio);
+ }
+}
+
+static void tea5764_set_freq(struct tea5764_device *radio, int freq)
+{
+ struct tea5764_regs *r = &radio->regs;
+
+ /* formula: (freq [+ or -] 225000) / 8192 */
+ if (r->tnctrl & TEA5764_TNCTRL_HLSI)
+ r->frqset = (freq + 225000) / 8192;
+ else
+ r->frqset = (freq - 225000) / 8192;
+}
+
+static int tea5764_get_freq(struct tea5764_device *radio)
+{
+ struct tea5764_regs *r = &radio->regs;
+
+ if (r->tnctrl & TEA5764_TNCTRL_HLSI)
+ return (r->frqchk * 8192) - 225000;
+ else
+ return (r->frqchk * 8192) + 225000;
+}
+
+/* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
+static void tea5764_tune(struct tea5764_device *radio, int freq)
+{
+ tea5764_set_freq(radio, freq);
+ if (tea5764_i2c_write(radio))
+ PWARN("Could not set frequency!");
+}
+
+static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
+{
+ struct tea5764_regs *r = &radio->regs;
+ int tnctrl = r->tnctrl;
+
+ if (audmode == V4L2_TUNER_MODE_MONO)
+ r->tnctrl |= TEA5764_TNCTRL_MST;
+ else
+ r->tnctrl &= ~TEA5764_TNCTRL_MST;
+ if (tnctrl != r->tnctrl)
+ tea5764_i2c_write(radio);
+}
+
+static int tea5764_get_audout_mode(struct tea5764_device *radio)
+{
+ struct tea5764_regs *r = &radio->regs;
+
+ if (r->tnctrl & TEA5764_TNCTRL_MST)
+ return V4L2_TUNER_MODE_MONO;
+ else
+ return V4L2_TUNER_MODE_STEREO;
+}
+
+static void tea5764_mute(struct tea5764_device *radio, int on)
+{
+ struct tea5764_regs *r = &radio->regs;
+ int tnctrl = r->tnctrl;
+
+ if (on)
+ r->tnctrl |= TEA5764_TNCTRL_MU;
+ else
+ r->tnctrl &= ~TEA5764_TNCTRL_MU;
+ if (tnctrl != r->tnctrl)
+ tea5764_i2c_write(radio);
+}
+
+static int tea5764_is_muted(struct tea5764_device *radio)
+{
+ return radio->regs.tnctrl & TEA5764_TNCTRL_MU;
+}
+
+/* V4L2 vidioc */
+static int vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *v)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+ struct video_device *dev = radio->videodev;
+
+ strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
+ strlcpy(v->card, dev->name, sizeof(v->card));
+ snprintf(v->bus_info, sizeof(v->bus_info), "I2C:%s", dev->dev.bus_id);
+ v->version = RADIO_VERSION;
+ v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ return 0;
+}
+
+static int vidioc_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+ struct tea5764_regs *r = &radio->regs;
+
+ if (v->index > 0)
+ return -EINVAL;
+
+ memset(v, 0, sizeof(v));
+ strcpy(v->name, "FM");
+ v->type = V4L2_TUNER_RADIO;
+ tea5764_i2c_read(radio);
+ v->rangelow = FREQ_MIN * FREQ_MUL;
+ v->rangehigh = FREQ_MAX * FREQ_MUL;
+ v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
+ if (r->tunchk & TEA5764_TUNCHK_STEREO)
+ v->rxsubchans = V4L2_TUNER_SUB_STEREO;
+ v->audmode = tea5764_get_audout_mode(radio);
+ v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
+ v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
+
+ return 0;
+}
+
+static int vidioc_s_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *v)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+
+ if (v->index > 0)
+ return -EINVAL;
+
+ tea5764_set_audout_mode(radio, v->audmode);
+ return 0;
+}
+
+static int vidioc_s_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+
+ if (f->tuner != 0)
+ return -EINVAL;
+ if (f->frequency == 0) {
+ /* We special case this as a power down control. */
+ tea5764_power_down(radio);
+ }
+ if (f->frequency < (FREQ_MIN * FREQ_MUL))
+ return -EINVAL;
+ if (f->frequency > (FREQ_MAX * FREQ_MUL))
+ return -EINVAL;
+ tea5764_power_up(radio);
+ tea5764_tune(radio, (f->frequency * 125) / 2);
+ return 0;
+}
+
+static int vidioc_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+ struct tea5764_regs *r = &radio->regs;
+
+ tea5764_i2c_read(radio);
+ memset(f, 0, sizeof(f));
+ f->type = V4L2_TUNER_RADIO;
+ if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
+ f->frequency = (tea5764_get_freq(radio) * 2) / 125;
+ else
+ f->frequency = 0;
+
+ return 0;
+}
+
+static int vidioc_queryctrl(struct file *file, void *priv,
+ struct v4l2_queryctrl *qc)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
+ if (qc->id && qc->id == radio_qctrl[i].id) {
+ memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
+ return 0;
+ }
+ }
+ return -EINVAL;
+}
+
+static int vidioc_g_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ tea5764_i2c_read(radio);
+ ctrl->value = tea5764_is_muted(radio) ? 1 : 0;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int vidioc_s_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+
+ switch (ctrl->id) {
+ case V4L2_CID_AUDIO_MUTE:
+ tea5764_mute(radio, ctrl->value);
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
+{
+ *i = 0;
+ return 0;
+}
+
+static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
+{
+ if (i != 0)
+ return -EINVAL;
+ return 0;
+}
+
+static int vidioc_g_audio(struct file *file, void *priv,
+ struct v4l2_audio *a)
+{
+ if (a->index > 1)
+ return -EINVAL;
+
+ strcpy(a->name, "Radio");
+ a->capability = V4L2_AUDCAP_STEREO;
+ return 0;
+}
+
+static int vidioc_s_audio(struct file *file, void *priv,
+ struct v4l2_audio *a)
+{
+ if (a->index != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int tea5764_open(struct file *file)
+{
+ /* Currently we support only one device */
+ int minor = video_devdata(file)->minor;
+ struct tea5764_device *radio = video_drvdata(file);
+
+ if (radio->videodev->minor != minor)
+ return -ENODEV;
+
+ mutex_lock(&radio->mutex);
+ /* Only exclusive access */
+ if (radio->users) {
+ mutex_unlock(&radio->mutex);
+ return -EBUSY;
+ }
+ radio->users++;
+ mutex_unlock(&radio->mutex);
+ file->private_data = radio;
+ return 0;
+}
+
+static int tea5764_close(struct file *file)
+{
+ struct tea5764_device *radio = video_drvdata(file);
+
+ if (!radio)
+ return -ENODEV;
+ mutex_lock(&radio->mutex);
+ radio->users--;
+ mutex_unlock(&radio->mutex);
+ return 0;
+}
+
+/* File system interface */
+static const struct v4l2_file_operations tea5764_fops = {
+ .owner = THIS_MODULE,
+ .open = tea5764_open,
+ .release = tea5764_close,
+ .ioctl = video_ioctl2,
+};
+
+static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+ .vidioc_g_tuner = vidioc_g_tuner,
+ .vidioc_s_tuner = vidioc_s_tuner,
+ .vidioc_g_audio = vidioc_g_audio,
+ .vidioc_s_audio = vidioc_s_audio,
+ .vidioc_g_input = vidioc_g_input,
+ .vidioc_s_input = vidioc_s_input,
+ .vidioc_g_frequency = vidioc_g_frequency,
+ .vidioc_s_frequency = vidioc_s_frequency,
+ .vidioc_queryctrl = vidioc_queryctrl,
+ .vidioc_g_ctrl = vidioc_g_ctrl,
+ .vidioc_s_ctrl = vidioc_s_ctrl,
+};
+
+/* V4L2 interface */
+static struct video_device tea5764_radio_template = {
+ .name = "TEA5764 FM-Radio",
+ .fops = &tea5764_fops,
+ .ioctl_ops = &tea5764_ioctl_ops,
+ .release = video_device_release,
+};
+
+/* I2C probe: check if the device exists and register with v4l if it is */
+static int __devinit tea5764_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tea5764_device *radio;
+ struct tea5764_regs *r;
+ int ret;
+
+ PDEBUG("probe");
+ radio = kmalloc(sizeof(struct tea5764_device), GFP_KERNEL);
+ if (!radio)
+ return -ENOMEM;
+
+ mutex_init(&radio->mutex);
+ radio->i2c_client = client;
+ ret = tea5764_i2c_read(radio);
+ if (ret)
+ goto errfr;
+ r = &radio->regs;
+ PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
+ if (r->chipid != TEA5764_CHIPID ||
+ (r->manid & 0x0fff) != TEA5764_MANID) {
+ PWARN("This chip is not a TEA5764!");
+ ret = -EINVAL;
+ goto errfr;
+ }
+
+ radio->videodev = video_device_alloc();
+ if (!(radio->videodev)) {
+ ret = -ENOMEM;
+ goto errfr;
+ }
+ memcpy(radio->videodev, &tea5764_radio_template,
+ sizeof(tea5764_radio_template));
+
+ i2c_set_clientdata(client, radio);
+ video_set_drvdata(radio->videodev, radio);
+
+ ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
+ if (ret < 0) {
+ PWARN("Could not register video device!");
+ goto errrel;
+ }
+
+ /* initialize and power off the chip */
+ tea5764_i2c_read(radio);
+ tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
+ tea5764_mute(radio, 1);
+ tea5764_power_down(radio);
+
+ PINFO("registered.");
+ return 0;
+errrel:
+ video_device_release(radio->videodev);
+errfr:
+ kfree(radio);
+ return ret;
+}
+
+static int __devexit tea5764_i2c_remove(struct i2c_client *client)
+{
+ struct tea5764_device *radio = i2c_get_clientdata(client);
+
+ PDEBUG("remove");
+ if (radio) {
+ tea5764_power_down(radio);
+ video_unregister_device(radio->videodev);
+ kfree(radio);
+ }
+ return 0;
+}
+
+/* I2C subsystem interface */
+static const struct i2c_device_id tea5764_id[] = {
+ { "radio-tea5764", 0 },
+ { } /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(i2c, tea5764_id);
+
+static struct i2c_driver tea5764_i2c_driver = {
+ .driver = {
+ .name = "radio-tea5764",
+ .owner = THIS_MODULE,
+ },
+ .probe = tea5764_i2c_probe,
+ .remove = __devexit_p(tea5764_i2c_remove),
+ .id_table = tea5764_id,
+};
+
+/* init the driver */
+static int __init tea5764_init(void)
+{
+ int ret = i2c_add_driver(&tea5764_i2c_driver);
+
+ printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
+ DRIVER_DESC "\n");
+ return ret;
+}
+
+/* cleanup the driver */
+static void __exit tea5764_exit(void)
+{
+ i2c_del_driver(&tea5764_i2c_driver);
+}
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+module_param(use_xtal, int, 1);
+MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
+module_param(radio_nr, int, 0);
+MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
+
+module_init(tea5764_init);
+module_exit(tea5764_exit);
projects / linux-beck.git / commitdiff