Philips TEA5761 Radio Linux driver for N800

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AM/FM Radio driver patch for N800. Compile Tested Only. Please test if
one has access to N800.

From: Trilok Soni <soni.trilok at gmail.com>
Date: Fri, 16 Feb 2007 00:09:08 +0530
Subject: [PATCH] : OMAP: Philips TEA5761 Radio driver for N800

- Taken from maemo.org N800 kernel package.

Signed-off-by: Trilok Soni <soni.trilok at gmail.com>
---
 drivers/media/radio/Kconfig         |   15 +
 drivers/media/radio/Makefile        |    1 +
 drivers/media/radio/radio-tea5761.c |  636 +++++++++++++++++++++++++++++++++++
 3 files changed, 652 insertions(+), 0 deletions(-)
 create mode 100644 drivers/media/radio/radio-tea5761.c

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfigindex 920b63f..45228b2 100644--- a/drivers/media/radio/Kconfig+++ b/drivers/media/radio/Kconfig@@ -317,6 +317,21 @@ config RADIO_ZOLTRIX_PORT help   Enter the I/O port of your Zoltrix radio card. +config RADIO_TEA5761+tristate "Philips Semiconductors TEA5761 I2C FM Radio"+select I2C+select VIDEO_V4L2+help+  Choose Y here if you have one of these AM/FM radio cards.++  In order to control your radio card, you will need to use programs+  that are compatible with the Video For Linux 2 API.  Information on+  this API and pointers to "v4l" programs may be found at+  <file:Documentation/video4linux/API.html>.++  To compile this driver as a module, choose M here: the+  module will be called radio-tea5761.+ config USB_DSBR tristate "D-Link USB FM radio support (EXPERIMENTAL)" depends on USB && VIDEO_V4L2 && EXPERIMENTALdiff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefileindex cf55a18..f3555fa 100644--- a/drivers/media/radio/Makefile+++ b/drivers/media/radio/Makefile@@ -20,6 +20,7 @@ obj-$(CONFIG_RADIO_GEMTEK) += radio-gemtek.o obj-$(CONFIG_RADIO_GEMTEK_PCI) += radio-gemtek-pci.o obj-$(CONFIG_RADIO_TRUST) += radio-trust.o obj-$(CONFIG_RADIO_MAESTRO) += radio-maestro.o+obj-$(CONFIG_RADIO_TEA5761) += radio-tea5761.o obj-$(CONFIG_USB_DSBR) += dsbr100.o  EXTRA_CFLAGS += -Isounddiff --git a/drivers/media/radio/radio-tea5761.c b/drivers/media/radio/radio-tea5761.cnew file mode 100644index 0000000..74fe99e--- /dev/null+++ b/drivers/media/radio/radio-tea5761.c@@ -0,0 +1,636 @@+/*+ * drivers/media/radio/radio-tea5761.c+ *+ * Copyright (C) 2005 Nokia Corporation+ *+ * 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 <linux/module.h>+#include <linux/version.h>+#include <linux/init.h>+#include <linux/i2c.h>+#include <linux/delay.h>+#include <media/v4l2-common.h>+#include <asm/arch/gpio.h>+#include <asm/arch/board.h>++#define DRIVER_NAME "tea5761"++#define TEA5761_VERSIONKERNEL_VERSION(0, 0, 1)++#define TEA5761_I2C_ADDR0x10++#define TEA5761_MANID0x002b+#define TEA5761_CHIPID0x5761++#define TEA5761_INTREG_BLMSK0x0001+#define TEA5761_INTREG_FRRMSK0x0002+#define TEA5761_INTREG_LEVMSK0x0008+#define TEA5761_INTREG_IFMSK0x0010+#define TEA5761_INTREG_BLMFLAG0x0100+#define TEA5761_INTREG_FRRFLAG0x0200+#define TEA5761_INTREG_LEVFLAG0x0800+#define TEA5761_INTREG_IFFLAG0x1000++#define TEA5761_FRQSET_SUD0x8000+#define TEA5761_FRQSET_SM0x4000++#define TEA5761_TNCTRL_PUPD00x4000+#define TEA5761_TNCTRL_BLIM0x2000+#define TEA5761_TNCTRL_SWPM0x1000+#define TEA5761_TNCTRL_IFCTC0x0800+#define TEA5761_TNCTRL_AFM0x0400+#define TEA5761_TNCTRL_SMUTE0x0200+#define TEA5761_TNCTRL_SNC0x0100+#define TEA5761_TNCTRL_MU0x0080+#define TEA5761_TNCTRL_SSL10x0040+#define TEA5761_TNCTRL_SSL00x0020+#define TEA5761_TNCTRL_HLSI0x0010+#define TEA5761_TNCTRL_MST0x0008+#define TEA5761_TNCTRL_SWP0x0004+#define TEA5761_TNCTRL_DTC0x0002+#define TEA5761_TNCTRL_AHLSI0x0001++#define TEA5761_TUNCHK_LEVEL(x)(((x) & 0x00F0) >> 4)+#define TEA5761_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)+#define TEA5761_TUNCHK_TUNTO0x0100+#define TEA5761_TUNCHK_LD0x0008+#define TEA5761_TUNCHK_STEREO0x0004++#define TEA5761_TESTREG_TRIGFR0x0800++#define TEA5761_FREQ_LOW87500+#define TEA5761_FREQ_HIGH108000++/* Probe for TEA5761 twice since the version N4B seems to be+ * broken and needs two probes to be found */+static unsigned short normal_i2c[] = {+TEA5761_I2C_ADDR, TEA5761_I2C_ADDR, I2C_CLIENT_END+};++I2C_CLIENT_INSMOD;++struct tea5761_regs {+u16 intreg;+u16 frqset;+u16 tnctrl;+u16 frqchk;+u16 tunchk;+u16 testreg;+u16 manid;+u16 chipid;+} __attribute__ ((packed));++struct tea5761_write_regs {+u8 intreg;+u16 frqset;+u16 tnctrl;+u16 testreg;+} __attribute__ ((packed));++struct tea5761_device {+struct video_device*video_dev;+struct i2c_client*i2c_dev;+struct tea5761_regsregs;+struct mutexmutex;+intusers;+};++static struct tea5761_device tea5761;++static struct i2c_drivertea5761_driver;+static int radio_nr = -1;++static int tea5761_read_regs(struct tea5761_device *tea)+{+int rc, i;+u16 *p = (u16 *) &tea->regs;+struct i2c_client *client = tea->i2c_dev;++rc = i2c_master_recv(client, (void*) &tea->regs, sizeof(tea->regs));+for (i = 0; i < 8; i++) {+p[i] = __be16_to_cpu(p[i]);+}++dev_dbg(&client->dev,+"chip state: %04x %04x %04x %04x %04x %04x %04x %04x/n",+p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);++if (rc < 0)+dev_err(&client->dev, "read/n");++return rc;+}++static void tea5761_write_regs(struct tea5761_device *tea)+{+struct tea5761_write_regs wr;+struct tea5761_regs *r = &tea->regs;+struct i2c_client *client = tea->i2c_dev;+#ifdef DEBUG+u8 *p = (u8 *) r;+#endif++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);++dev_dbg(&client->dev,+"writing state: %02x %02x %02x %02x %02x %02x %02x/n",+p[0], p[1], p[2], p[3], p[4], p[5], p[6]);+if (i2c_master_send(client, (void *) &wr, sizeof(wr)) < 0)+dev_err(&client->dev, "write/n");+}++static void tea5761_power_up(struct tea5761_device *tea)+{+struct tea5761_regs *r = &tea->regs;++if (!(r->tnctrl & TEA5761_TNCTRL_PUPD0)) {+r->tnctrl &= ~(TEA5761_TNCTRL_AFM | TEA5761_TNCTRL_MU |+       TEA5761_TNCTRL_HLSI);+r->testreg |= TEA5761_TESTREG_TRIGFR;+r->tnctrl |= TEA5761_TNCTRL_PUPD0;+return tea5761_write_regs(tea);+}+}++static void tea5761_power_down(struct tea5761_device *tea)+{+struct tea5761_regs *r = &tea->regs;++if (r->tnctrl & TEA5761_TNCTRL_PUPD0) {+r->tnctrl &= ~TEA5761_TNCTRL_PUPD0;+return tea5761_write_regs(tea);+}+}++static void tea5761_set_freq(struct tea5761_device *tea, int freq)+{+struct tea5761_regs *r = &tea->regs;++if (r->tnctrl & TEA5761_TNCTRL_HLSI)+r->frqset = (freq + 225000) / 8192;+else+r->frqset = (freq - 225000) / 8192;+}++static int tea5761_get_freq(struct tea5761_device *tea)+{+struct tea5761_regs *r = &tea->regs;++if (r->tnctrl & TEA5761_TNCTRL_HLSI)+return (r->frqchk * 8192) - 225000;+else+return (r->frqchk * 8192) + 225000;+}++static void tea5761_tune(struct tea5761_device *tea, int freq)+{+tea5761_set_freq(tea, freq);+tea5761_write_regs(tea);+}++static void tea5761_set_audout_mode(struct tea5761_device *tea, int audmode)+{+struct tea5761_regs *r = &tea->regs;+int tnctrl = r->tnctrl;++if (audmode == V4L2_TUNER_MODE_MONO)+r->tnctrl |= TEA5761_TNCTRL_MST;+else+r->tnctrl &= ~TEA5761_TNCTRL_MST;+if (tnctrl != r->tnctrl)+tea5761_write_regs(tea);+}++static int tea5761_get_audout_mode(struct tea5761_device *tea)+{+struct tea5761_regs *r = &tea->regs;++if (r->tnctrl & TEA5761_TNCTRL_MST)+return V4L2_TUNER_MODE_MONO;+else+return V4L2_TUNER_MODE_STEREO;+}++static void tea5761_mute(struct tea5761_device *tea, int on)+{+struct tea5761_regs *r = &tea->regs;+int tnctrl = r->tnctrl;++if (on)+r->tnctrl |= TEA5761_TNCTRL_MU;+else+r->tnctrl &= ~TEA5761_TNCTRL_MU;+if (tnctrl != r->tnctrl)+tea5761_write_regs(tea);+}++static int tea5761_is_muted(struct tea5761_device *tea)+{+return tea->regs.tnctrl & TEA5761_TNCTRL_MU;+}++static int tea5761_do_ioctl(struct inode *inode, struct file *file,+    unsigned int cmd, void *arg)+{+struct tea5761_device *tea = file->private_data;+struct video_device *dev = tea->video_dev;+struct i2c_client *client = tea->i2c_dev;+struct tea5761_regs *r = &tea->regs;++union {+struct v4l2_capability c;+struct v4l2_tuner t;+struct v4l2_frequency f;+struct v4l2_queryctrl qc;+struct v4l2_control ct;+} *u = arg;++tea5761_read_regs(tea);++switch (cmd) {+case VIDIOC_QUERYCAP:+dev_dbg(&client->dev, "VIDIOC_QUERYCAP/n");+memset(&u->c, 0, sizeof(u->c));+strlcpy(u->c.driver, dev->dev->driver->name,+sizeof(u->c.driver));+strlcpy(u->c.card, dev->name, sizeof(u->c.card));+snprintf(u->c.bus_info, sizeof(u->c.bus_info), "I2C:%s",+ dev->dev->bus_id);+u->c.version = TEA5761_VERSION;+u->c.capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;+break;++case VIDIOC_G_TUNER:+/* Only one tuner chip */+dev_dbg(&client->dev, "VIDIOC_G_TUNER/n");+if (u->t.index != 0)+return -EINVAL;++memset(&u->t, 0, sizeof(u->t));+u->t.type = V4L2_TUNER_RADIO;+strlcpy(u->t.name, "FM", sizeof(u->t.name));+/* Freq in 62.5Hz units */+u->t.rangelow = TEA5761_FREQ_LOW * 16;+u->t.rangehigh = TEA5761_FREQ_HIGH * 16;+u->t.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;+if (r->tunchk & TEA5761_TUNCHK_STEREO)+u->t.rxsubchans = V4L2_TUNER_SUB_STEREO;+u->t.audmode = tea5761_get_audout_mode(tea);+u->t.signal = TEA5761_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;+u->t.afc = TEA5761_TUNCHK_IFCNT(r->tunchk);+break;++case VIDIOC_S_TUNER:+/* Only tuner nro 0 can be selected. */+dev_dbg(&client->dev, "VIDIOC_S_TUNER/n");+if (u->t.index != 0)+return -EINVAL;+tea5761_set_audout_mode(tea, u->t.audmode);+break;++case VIDIOC_G_FREQUENCY:+dev_dbg(&client->dev, "VIDIOC_G_FREQUENCY/n");+memset(&u->f, 0, sizeof(u->f));+u->f.type = V4L2_TUNER_RADIO;+if (r->tnctrl & TEA5761_TNCTRL_PUPD0)+u->f.frequency = (tea5761_get_freq(tea) * 2) / 125;+else+u->f.frequency = 0;+break;++case VIDIOC_S_FREQUENCY:+dev_dbg(&client->dev, "VIDIOC_S_FREQUENCY %u/n",+u->f.frequency);+if (u->f.tuner != 0)+return -EINVAL;+if (u->f.frequency == 0) {+/* We special case this as a power down+ * control. */+tea5761_power_down(tea);+break;+}+if (u->f.frequency < 16 * TEA5761_FREQ_LOW)+return -EINVAL;+if (u->f.frequency > 16 * TEA5761_FREQ_HIGH)+return -EINVAL;++tea5761_power_up(tea);+tea5761_tune(tea, (u->f.frequency * 125) / 2);+break;++case VIDIOC_QUERYCTRL:+dev_dbg(&client->dev, "VIDIOC_QUERYCTRL %d/n", u->qc.id);+if (u->qc.id != V4L2_CID_AUDIO_MUTE)+return -EINVAL;+strlcpy(u->qc.name, "Mute", sizeof(u->qc.name));+u->qc.minimum = 0;+u->qc.maximum = 1;+u->qc.step = 1;+u->qc.default_value = 0;+u->qc.type = V4L2_CTRL_TYPE_BOOLEAN;+break;++case VIDIOC_G_CTRL:+dev_dbg(&client->dev, "VIDIOC_G_CTRL %d/n", u->ct.id);+if (u->ct.id != V4L2_CID_AUDIO_MUTE)+return -EINVAL;+if (r->tnctrl & TEA5761_TNCTRL_PUPD0)+u->ct.value = tea5761_is_muted(tea) ? 1 : 0;+else+u->ct.value = 0;+break;++case VIDIOC_S_CTRL:+dev_dbg(&client->dev, "VIDIOC_S_CTRL %d/n", u->ct.id);+if (u->ct.id != V4L2_CID_AUDIO_MUTE)+return -EINVAL;+tea5761_mute(tea, u->ct.value);+break;++default:+return -ENOIOCTLCMD;+}++return 0;+}++static int tea5761_ioctl(struct inode *inode, struct file *file,+ unsigned int cmd, unsigned long arg)+{+return video_usercopy(inode, file, cmd, arg, tea5761_do_ioctl);+}++static int tea5761_open(struct inode *inode, struct file *file)+{+int minor = iminor(file->f_dentry->d_inode);+/* Currently we support only one device */+struct tea5761_device *tea = &tea5761;++if (tea->video_dev->minor != minor)+return -ENODEV;++mutex_lock(&tea->mutex);+/* Only exclusive access */+if (tea->users) {+mutex_unlock(&tea->mutex);+return -EBUSY;+}+tea->users++;+mutex_unlock(&tea->mutex);++file->private_data = tea;+return 0;+}++static int tea5761_release(struct inode *inode, struct file *file)+{+struct tea5761_device *tea = file->private_data;++mutex_lock(&tea->mutex);+tea->users--;+mutex_unlock(&tea->mutex);++return 0;+}++static struct file_operations tea5761_fops = {+.owner= THIS_MODULE,+.open           = tea5761_open,+.release= tea5761_release,+.ioctl= tea5761_ioctl,+.llseek         = no_llseek,+};++static struct video_device tea5761_video_device = {+.owner         = THIS_MODULE,+.name          = "TEA5761 FM-Radio",+.type          = VID_TYPE_TUNER,+.hardware      = 40 /* VID_HARDWARE_TEA5761UK */,+.fops          = &tea5761_fops,+.release       = video_device_release+};++static int tea5761_probe(struct i2c_adapter *adapter, int address,+  int kind)+{+struct i2c_client *client;+struct video_device *video_dev;+int err = 0;+static const char *client_name = "TEA5761 FM-Radio";+struct tea5761_device *tea = &tea5761;+struct tea5761_regs   *r = &tea->regs;++mutex_init(&tea->mutex);+        /* I2C detection and initialization */+client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);+if (client == NULL) {+dev_err(&adapter->dev, DRIVER_NAME+": couldn't allocate memory/n");+return -ENOMEM;+}+tea->i2c_dev = client;++client->addr = address;+client->adapter = adapter;+client->driver = &tea5761_driver;+client->dev.driver = &tea5761_driver.driver;+client->flags = 0;+strlcpy(client->name, client_name, I2C_NAME_SIZE);++if (kind < 0) {+if (tea5761_read_regs(tea) < 0) {+dev_info(&client->dev,+ "chip read failed for %d-%04x/n",+ adapter->nr, address);+goto err_tea_dev;+}+if (r->chipid != TEA5761_CHIPID) {+dev_info(&client->dev,+ "bad chipid (0x%04x) at %d-%04x/n",+ r->chipid, adapter->nr, address);+goto err_tea_dev;+}+if ((r->manid & 0x0fff) != TEA5761_MANID) {+dev_info(&client->dev,+ "bad manid (0x%04x) at %d-%04x/n",+ r->manid, adapter->nr, address);+goto err_tea_dev;+}+}++err = i2c_attach_client(client);+if (err) {+dev_err(&client->dev, "couldn't attach to address %d-%04x/n",+        adapter->nr, address);+goto err_tea_dev;+}++/* V4L initialization */+video_dev = video_device_alloc();+if (video_dev == NULL) {+dev_err(&client->dev, "couldn't allocate memory/n");+err = -ENOMEM;+goto err_i2c_attach;+}+tea->video_dev = video_dev;++*video_dev = tea5761_video_device;+video_dev->dev = &client->dev;+i2c_set_clientdata(client, video_dev);++/* initialize and power off the chip */+tea5761_read_regs(tea);+tea5761_set_audout_mode(tea, V4L2_TUNER_MODE_STEREO);+tea5761_mute(tea, 0);+tea5761_power_down(tea);++tea5761.video_dev = video_dev;+tea5761.i2c_dev = client;++err = video_register_device(video_dev, VFL_TYPE_RADIO, radio_nr);+if (err) {+dev_err(&client->dev, "couldn't register video device/n");+goto err_video_alloc;+}++dev_info(&client->dev, "tea5761 (version %d) detected at %d-%04x/n",+(tea->regs.manid >> 12) & 0xf, adapter->nr, address);++return 0;++err_video_alloc:+video_device_release(video_dev);+err_i2c_attach:+i2c_detach_client(client);+err_tea_dev:+kfree(client);+return err;+}++static int tea5761_attach_adapter(struct i2c_adapter *adapter)+{+if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))+return -EINVAL;++return i2c_probe(adapter, &addr_data, tea5761_probe);+}++static int tea5761_detach_client(struct i2c_client *client)+{+struct video_device *vd = i2c_get_clientdata(client);++i2c_detach_client(client);+video_unregister_device(vd);+kfree(client);++return 0;+}++static struct i2c_driver tea5761_driver = {+.id= I2C_DRIVERID_TUNER,+.driver = {+.name= DRIVER_NAME,+},+.attach_adapter= tea5761_attach_adapter,+.detach_client= tea5761_detach_client,+};++#if CONFIG_ARCH_OMAP+/* No way to pass platform device data. Enable here all the TEA5761+ * devices, since I2C address scanning will need them to respond.+ */+static int enable_gpio;++static int __init tea5761_dev_init(void)+{+const struct omap_tea5761_config *info;++info = omap_get_config(OMAP_TAG_TEA5761, struct omap_tea5761_config);+if (info) {+enable_gpio = info->enable_gpio;+}++if (enable_gpio) {+pr_debug(DRIVER_NAME ": enabling tea5761 at GPIO %d/n",+ enable_gpio);++if (omap_request_gpio(enable_gpio) < 0) {+printk(KERN_ERR DRIVER_NAME ": can't request GPIO %d/n",+       enable_gpio);+return -ENODEV;+}++omap_set_gpio_direction(enable_gpio, 0);+udelay(50);+omap_set_gpio_dataout(enable_gpio, 1);+}++return 0;+}++static void __exit tea5761_dev_exit(void)+{+if (enable_gpio) {+omap_set_gpio_dataout(enable_gpio, 0);+omap_free_gpio(enable_gpio);+}+}+#else+static int __init tea5761_dev_init(void)+{+}++static void __exit tea5761_dev_exit(void)+{+}+#endif++static int __init tea5761_init(void)+{+int res;++if ((res = tea5761_dev_init()) < 0)+return res;++if ((res = i2c_add_driver(&tea5761_driver))) {+printk(KERN_ERR DRIVER_NAME ": driver registration failed/n");+return res;+}++return 0;+}++static void __exit tea5761_exit(void)+{+int res;++if ((res = i2c_del_driver(&tea5761_driver)))+printk(KERN_ERR DRIVER_NAME ": i2c driver removal failed/n");+tea5761_dev_exit();+}++MODULE_AUTHOR("Timo Ter?s");+MODULE_DESCRIPTION("I2C interface for TEA5761.");+MODULE_LICENSE("GPL");++module_param(radio_nr, int, 0);+MODULE_PARM_DESC(nr_radio, "video4linux device number to use");++module_init(tea5761_init)+module_exit(tea5761_exit)