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Subject: [media] si2165: support i2c_client attach
Author:  Matthias Schwarzott <z...@gentoo.org>
Date:    Tue Jul 26 04:09:02 2016 -0300

Afterwards it is possible to convert attaching in card drivers.

Signed-off-by: Matthias Schwarzott <z...@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/si2165.c | 149 +++++++++++++++++++++++++++++++++++
 drivers/media/dvb-frontends/si2165.h |  22 ++++++
 2 files changed, 171 insertions(+)

---

diff --git a/drivers/media/dvb-frontends/si2165.c 
b/drivers/media/dvb-frontends/si2165.c
index 849c3c421262..55127d4cb747 100644
--- a/drivers/media/dvb-frontends/si2165.c
+++ b/drivers/media/dvb-frontends/si2165.c
@@ -40,6 +40,8 @@
  */
 
 struct si2165_state {
+       struct i2c_client *client;
+
        struct i2c_adapter *i2c;
 
        struct dvb_frontend fe;
@@ -1163,6 +1165,153 @@ error:
 }
 EXPORT_SYMBOL(si2165_attach);
 
+static int si2165_probe(struct i2c_client *client,
+               const struct i2c_device_id *id)
+{
+       struct si2165_state *state = NULL;
+       struct si2165_platform_data *pdata = client->dev.platform_data;
+       int n;
+       int ret = 0;
+       u8 val;
+       char rev_char;
+       const char *chip_name;
+
+       /* allocate memory for the internal state */
+       state = kzalloc(sizeof(struct si2165_state), GFP_KERNEL);
+       if (state == NULL) {
+               ret = -ENOMEM;
+               goto error;
+       }
+
+       /* setup the state */
+       state->client = client;
+       state->i2c = client->adapter;
+       state->config.i2c_addr = client->addr;
+       state->config.chip_mode = pdata->chip_mode;
+       state->config.ref_freq_Hz = pdata->ref_freq_Hz;
+       state->config.inversion = pdata->inversion;
+
+       if (state->config.ref_freq_Hz < 4000000
+           || state->config.ref_freq_Hz > 27000000) {
+               dev_err(&state->i2c->dev, "%s: ref_freq of %d Hz not supported 
by this driver\n",
+                        KBUILD_MODNAME, state->config.ref_freq_Hz);
+               ret = -EINVAL;
+               goto error;
+       }
+
+       /* create dvb_frontend */
+       memcpy(&state->fe.ops, &si2165_ops,
+               sizeof(struct dvb_frontend_ops));
+       state->fe.ops.release = NULL;
+       state->fe.demodulator_priv = state;
+       i2c_set_clientdata(client, state);
+
+       /* powerup */
+       ret = si2165_writereg8(state, 0x0000, state->config.chip_mode);
+       if (ret < 0)
+               goto nodev_error;
+
+       ret = si2165_readreg8(state, 0x0000, &val);
+       if (ret < 0)
+               goto nodev_error;
+       if (val != state->config.chip_mode)
+               goto nodev_error;
+
+       ret = si2165_readreg8(state, 0x0023, &state->chip_revcode);
+       if (ret < 0)
+               goto nodev_error;
+
+       ret = si2165_readreg8(state, 0x0118, &state->chip_type);
+       if (ret < 0)
+               goto nodev_error;
+
+       /* powerdown */
+       ret = si2165_writereg8(state, 0x0000, SI2165_MODE_OFF);
+       if (ret < 0)
+               goto nodev_error;
+
+       if (state->chip_revcode < 26)
+               rev_char = 'A' + state->chip_revcode;
+       else
+               rev_char = '?';
+
+       switch (state->chip_type) {
+       case 0x06:
+               chip_name = "Si2161";
+               state->has_dvbt = true;
+               break;
+       case 0x07:
+               chip_name = "Si2165";
+               state->has_dvbt = true;
+               state->has_dvbc = true;
+               break;
+       default:
+               dev_err(&state->i2c->dev, "%s: Unsupported Silicon Labs chip 
(type %d, rev %d)\n",
+                       KBUILD_MODNAME, state->chip_type, state->chip_revcode);
+               goto nodev_error;
+       }
+
+       dev_info(&state->i2c->dev,
+               "%s: Detected Silicon Labs %s-%c (type %d, rev %d)\n",
+               KBUILD_MODNAME, chip_name, rev_char, state->chip_type,
+               state->chip_revcode);
+
+       strlcat(state->fe.ops.info.name, chip_name,
+                       sizeof(state->fe.ops.info.name));
+
+       n = 0;
+       if (state->has_dvbt) {
+               state->fe.ops.delsys[n++] = SYS_DVBT;
+               strlcat(state->fe.ops.info.name, " DVB-T",
+                       sizeof(state->fe.ops.info.name));
+       }
+       if (state->has_dvbc) {
+               state->fe.ops.delsys[n++] = SYS_DVBC_ANNEX_A;
+               strlcat(state->fe.ops.info.name, " DVB-C",
+                       sizeof(state->fe.ops.info.name));
+       }
+
+       /* return fe pointer */
+       *pdata->fe = &state->fe;
+
+       return 0;
+
+nodev_error:
+       ret = -ENODEV;
+error:
+       kfree(state);
+       dev_dbg(&client->dev, "failed=%d\n", ret);
+       return ret;
+}
+
+static int si2165_remove(struct i2c_client *client)
+{
+       struct si2165_state *state = i2c_get_clientdata(client);
+
+       dev_dbg(&client->dev, "\n");
+
+       kfree(state);
+       return 0;
+}
+
+static const struct i2c_device_id si2165_id_table[] = {
+       {"si2165", 0},
+       {}
+};
+MODULE_DEVICE_TABLE(i2c, si2165_id_table);
+
+static struct i2c_driver si2165_driver = {
+       .driver = {
+               .owner  = THIS_MODULE,
+               .name   = "si2165",
+       },
+       .probe          = si2165_probe,
+       .remove         = si2165_remove,
+       .id_table       = si2165_id_table,
+};
+
+module_i2c_driver(si2165_driver);
+
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 
diff --git a/drivers/media/dvb-frontends/si2165.h 
b/drivers/media/dvb-frontends/si2165.h
index 8a15d6a9c552..abbebc9edf0c 100644
--- a/drivers/media/dvb-frontends/si2165.h
+++ b/drivers/media/dvb-frontends/si2165.h
@@ -28,6 +28,28 @@ enum {
        SI2165_MODE_PLL_XTAL = 0x21
 };
 
+/* I2C addresses
+ * possible values: 0x64,0x65,0x66,0x67
+ */
+struct si2165_platform_data {
+       /*
+        * frontend
+        * returned by driver
+        */
+       struct dvb_frontend **fe;
+
+       /* external clock or XTAL */
+       u8 chip_mode;
+
+       /* frequency of external clock or xtal in Hz
+        * possible values: 4000000, 16000000, 20000000, 240000000, 27000000
+        */
+       u32 ref_freq_Hz;
+
+       /* invert the spectrum */
+       bool inversion;
+};
+
 struct si2165_config {
        /* i2c addr
         * possible values: 0x64,0x65,0x66,0x67 */

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