V4L/DVB (13177): radio: Add support for TEF6862 tuner

This patch adds support for TEF6862 Car Radio Enhanced Selectivity Tuner.

It's implemented as a subdev, supporting checking signal strength
and setting and getting frequency.

Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 245 insertions, 0 deletions

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index a87a477c87f..931b8b370b5 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -401,4 +401,16 @@ config RADIO_TEA5764_XTAL
           Say Y here if TEA5764 have a 32768 Hz crystal in circuit, say N
           here if TEA5764 reference frequency is connected in FREQIN.
 
+config RADIO_TEF6862
+        tristate "TEF6862 Car Radio Enhanced Selectivity Tuner"
+        depends on I2C && VIDEO_V4L2
+        ---help---
+          Say Y here if you want to use the TEF6862 Car Radio Enhanced
+          Selectivity Tuner, found for instance on the Russellville development
+          board. On the russellville the device is connected to internal
+          timberdale I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called TEF6862.
+
 endif # RADIO_ADAPTERS
diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
index 2a1be3bf4f7..a4bdca08a94 100644
--- a/drivers/media/radio/Makefile
+++ b/drivers/media/radio/Makefile
@@ -22,5 +22,6 @@ obj-$(CONFIG_USB_DSBR) += dsbr100.o
 obj-$(CONFIG_RADIO_SI470X) += si470x/
 obj-$(CONFIG_USB_MR800) += radio-mr800.o
 obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o
+obj-$(CONFIG_RADIO_TEF6862) += tef6862.o
 
 EXTRA_CFLAGS += -Isound
diff --git a/drivers/media/radio/tef6862.c b/drivers/media/radio/tef6862.c
new file mode 100644
index 00000000000..6e607ff0c16
--- /dev/null
+++ b/drivers/media/radio/tef6862.c
@@ -0,0 +1,232 @@
+/*
+ * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+
+#define DRIVER_NAME "tef6862"
+
+#define FREQ_MUL 16000
+
+#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
+#define TEF6862_HI_FREQ (108 * FREQ_MUL)
+
+/* Write mode sub addresses */
+#define WM_SUB_BANDWIDTH        0x0
+#define WM_SUB_PLLM             0x1
+#define WM_SUB_PLLL             0x2
+#define WM_SUB_DAA              0x3
+#define WM_SUB_AGC              0x4
+#define WM_SUB_BAND             0x5
+#define WM_SUB_CONTROL          0x6
+#define WM_SUB_LEVEL            0x7
+#define WM_SUB_IFCF             0x8
+#define WM_SUB_IFCAP            0x9
+#define WM_SUB_ACD              0xA
+#define WM_SUB_TEST             0xF
+
+/* Different modes of the MSA register */
+#define MODE_BUFFER             0x0
+#define MODE_PRESET             0x1
+#define MODE_SEARCH             0x2
+#define MODE_AF_UPDATE          0x3
+#define MODE_JUMP               0x4
+#define MODE_CHECK              0x5
+#define MODE_LOAD               0x6
+#define MODE_END                0x7
+#define MODE_SHIFT              5
+
+struct tef6862_state {
+        struct v4l2_subdev sd;
+        unsigned long freq;
+};
+
+static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
+{
+        return container_of(sd, struct tef6862_state, sd);
+}
+
+static u16 tef6862_sigstr(struct i2c_client *client)
+{
+        u8 buf[4];
+        int err = i2c_master_recv(client, buf, sizeof(buf));
+        if (err == sizeof(buf))
+                return buf[3] << 8;
+        return 0;
+}
+
+static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
+{
+        if (v->index > 0)
+                return -EINVAL;
+
+        /* only support FM for now */
+        strlcpy(v->name, "FM", sizeof(v->name));
+        v->type = V4L2_TUNER_RADIO;
+        v->rangelow = TEF6862_LO_FREQ;
+        v->rangehigh = TEF6862_HI_FREQ;
+        v->rxsubchans = V4L2_TUNER_SUB_MONO;
+        v->capability = V4L2_TUNER_CAP_LOW;
+        v->audmode = V4L2_TUNER_MODE_STEREO;
+        v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
+
+        return 0;
+}
+
+static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
+{
+        return v->index ? -EINVAL : 0;
+}
+
+static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+        struct tef6862_state *state = to_state(sd);
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+        u16 pll;
+        u8 i2cmsg[3];
+        int err;
+
+        if (f->tuner != 0)
+                return -EINVAL;
+
+        pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
+        i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
+        i2cmsg[1] = (pll >> 8) & 0xff;
+        i2cmsg[2] = pll & 0xff;
+
+        err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
+        if (!err)
+                state->freq = f->frequency;
+        return err;
+}
+
+static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+        struct tef6862_state *state = to_state(sd);
+
+        if (f->tuner != 0)
+                return -EINVAL;
+        f->type = V4L2_TUNER_RADIO;
+        f->frequency = state->freq;
+        return 0;
+}
+
+static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
+        struct v4l2_dbg_chip_ident *chip)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+        return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
+}
+
+static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
+        .g_tuner = tef6862_g_tuner,
+        .s_tuner = tef6862_s_tuner,
+        .s_frequency = tef6862_s_frequency,
+        .g_frequency = tef6862_g_frequency,
+};
+
+static const struct v4l2_subdev_core_ops tef6862_core_ops = {
+        .g_chip_ident = tef6862_g_chip_ident,
+};
+
+static const struct v4l2_subdev_ops tef6862_ops = {
+        .core = &tef6862_core_ops,
+        .tuner = &tef6862_tuner_ops,
+};
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static int __devinit tef6862_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct tef6862_state *state;
+        struct v4l2_subdev *sd;
+
+        /* Check if the adapter supports the needed features */
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EIO;
+
+        v4l_info(client, "chip found @ 0x%02x (%s)\n",
+                        client->addr << 1, client->adapter->name);
+
+        state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
+        if (state == NULL)
+                return -ENOMEM;
+        state->freq = TEF6862_LO_FREQ;
+
+        sd = &state->sd;
+        v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
+
+        return 0;
+}
+
+static int __devexit tef6862_remove(struct i2c_client *client)
+{
+        struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+        v4l2_device_unregister_subdev(sd);
+        kfree(to_state(sd));
+        return 0;
+}
+
+static const struct i2c_device_id tef6862_id[] = {
+        {DRIVER_NAME, 0},
+        {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tef6862_id);
+
+static struct i2c_driver tef6862_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = DRIVER_NAME,
+        },
+        .probe          = tef6862_probe,
+        .remove         = tef6862_remove,
+        .id_table       = tef6862_id,
+};
+
+static __init int tef6862_init(void)
+{
+        return i2c_add_driver(&tef6862_driver);
+}
+
+static __exit void tef6862_exit(void)
+{
+        i2c_del_driver(&tef6862_driver);
+}
+
+module_init(tef6862_init);
+module_exit(tef6862_exit);
+
+MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
+MODULE_AUTHOR("Mocean Laboratories");
+MODULE_LICENSE("GPL v2");
+