diff options
Diffstat (limited to 'drivers/media/tuners/si2157.c')
| -rw-r--r-- | drivers/media/tuners/si2157.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c new file mode 100644 index 00000000000..fa4cc7b880a --- /dev/null +++ b/drivers/media/tuners/si2157.c @@ -0,0 +1,260 @@ +/* + * Silicon Labs Si2157 silicon tuner driver + * + * Copyright (C) 2014 Antti Palosaari <crope@iki.fi> + * + * 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. + */ + +#include "si2157_priv.h" + +/* execute firmware command */ +static int si2157_cmd_execute(struct si2157 *s, struct si2157_cmd *cmd) +{ + int ret; + u8 buf[1]; + unsigned long timeout; + + mutex_lock(&s->i2c_mutex); + + if (cmd->len) { + /* write cmd and args for firmware */ + ret = i2c_master_send(s->client, cmd->args, cmd->len); + if (ret < 0) { + goto err_mutex_unlock; + } else if (ret != cmd->len) { + ret = -EREMOTEIO; + goto err_mutex_unlock; + } + } + + /* wait cmd execution terminate */ + #define TIMEOUT 80 + timeout = jiffies + msecs_to_jiffies(TIMEOUT); + while (!time_after(jiffies, timeout)) { + ret = i2c_master_recv(s->client, buf, 1); + if (ret < 0) { + goto err_mutex_unlock; + } else if (ret != 1) { + ret = -EREMOTEIO; + goto err_mutex_unlock; + } + + /* firmware ready? */ + if ((buf[0] >> 7) & 0x01) + break; + } + + dev_dbg(&s->client->dev, "%s: cmd execution took %d ms\n", __func__, + jiffies_to_msecs(jiffies) - + (jiffies_to_msecs(timeout) - TIMEOUT)); + + if (!((buf[0] >> 7) & 0x01)) { + ret = -ETIMEDOUT; + goto err_mutex_unlock; + } else { + ret = 0; + } + +err_mutex_unlock: + mutex_unlock(&s->i2c_mutex); + if (ret) + goto err; + + return 0; +err: + dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret); + return ret; +} + +static int si2157_init(struct dvb_frontend *fe) +{ + struct si2157 *s = fe->tuner_priv; + + dev_dbg(&s->client->dev, "%s:\n", __func__); + + s->active = true; + + return 0; +} + +static int si2157_sleep(struct dvb_frontend *fe) +{ + struct si2157 *s = fe->tuner_priv; + + dev_dbg(&s->client->dev, "%s:\n", __func__); + + s->active = false; + + return 0; +} + +static int si2157_set_params(struct dvb_frontend *fe) +{ + struct si2157 *s = fe->tuner_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + int ret; + struct si2157_cmd cmd; + + dev_dbg(&s->client->dev, + "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n", + __func__, c->delivery_system, c->frequency, + c->bandwidth_hz); + + if (!s->active) { + ret = -EAGAIN; + goto err; + } + + /* configure? */ + cmd.args[0] = 0xc0; + cmd.args[1] = 0x00; + cmd.args[2] = 0x0c; + cmd.args[3] = 0x00; + cmd.args[4] = 0x00; + cmd.args[5] = 0x01; + cmd.args[6] = 0x01; + cmd.args[7] = 0x01; + cmd.args[8] = 0x01; + cmd.args[9] = 0x01; + cmd.args[10] = 0x01; + cmd.args[11] = 0x02; + cmd.args[12] = 0x00; + cmd.args[13] = 0x00; + cmd.args[14] = 0x01; + cmd.len = 15; + ret = si2157_cmd_execute(s, &cmd); + if (ret) + goto err; + + cmd.args[0] = 0x02; + cmd.len = 1; + ret = si2157_cmd_execute(s, &cmd); + if (ret) + goto err; + + cmd.args[0] = 0x01; + cmd.args[1] = 0x01; + cmd.len = 2; + ret = si2157_cmd_execute(s, &cmd); + if (ret) + goto err; + + /* set frequency */ + cmd.args[0] = 0x41; + cmd.args[1] = 0x00; + cmd.args[2] = 0x00; + cmd.args[3] = 0x00; + cmd.args[4] = (c->frequency >> 0) & 0xff; + cmd.args[5] = (c->frequency >> 8) & 0xff; + cmd.args[6] = (c->frequency >> 16) & 0xff; + cmd.args[7] = (c->frequency >> 24) & 0xff; + cmd.len = 8; + ret = si2157_cmd_execute(s, &cmd); + if (ret) + goto err; + + return 0; +err: + dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret); + return ret; +} + +static const struct dvb_tuner_ops si2157_tuner_ops = { + .info = { + .name = "Silicon Labs Si2157", + .frequency_min = 110000000, + .frequency_max = 862000000, + }, + + .init = si2157_init, + .sleep = si2157_sleep, + .set_params = si2157_set_params, +}; + +static int si2157_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct si2157_config *cfg = client->dev.platform_data; + struct dvb_frontend *fe = cfg->fe; + struct si2157 *s; + struct si2157_cmd cmd; + int ret; + + s = kzalloc(sizeof(struct si2157), GFP_KERNEL); + if (!s) { + ret = -ENOMEM; + dev_err(&client->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME); + goto err; + } + + s->client = client; + s->fe = cfg->fe; + mutex_init(&s->i2c_mutex); + + /* check if the tuner is there */ + cmd.len = 0; + ret = si2157_cmd_execute(s, &cmd); + if (ret) + goto err; + + fe->tuner_priv = s; + memcpy(&fe->ops.tuner_ops, &si2157_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + i2c_set_clientdata(client, s); + + dev_info(&s->client->dev, + "%s: Silicon Labs Si2157 successfully attached\n", + KBUILD_MODNAME); + return 0; +err: + dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret); + kfree(s); + + return ret; +} + +static int si2157_remove(struct i2c_client *client) +{ + struct si2157 *s = i2c_get_clientdata(client); + struct dvb_frontend *fe = s->fe; + + dev_dbg(&client->dev, "%s:\n", __func__); + + memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops)); + fe->tuner_priv = NULL; + kfree(s); + + return 0; +} + +static const struct i2c_device_id si2157_id[] = { + {"si2157", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, si2157_id); + +static struct i2c_driver si2157_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "si2157", + }, + .probe = si2157_probe, + .remove = si2157_remove, + .id_table = si2157_id, +}; + +module_i2c_driver(si2157_driver); + +MODULE_DESCRIPTION("Silicon Labs Si2157 silicon tuner driver"); +MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); +MODULE_LICENSE("GPL"); |