diff options
Diffstat (limited to 'drivers/media/dvb-frontends/lnbh25.c')
| -rw-r--r-- | drivers/media/dvb-frontends/lnbh25.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/lnbh25.c b/drivers/media/dvb-frontends/lnbh25.c new file mode 100644 index 000000000..0b388502c --- /dev/null +++ b/drivers/media/dvb-frontends/lnbh25.c @@ -0,0 +1,189 @@ +/* + * lnbh25.c + * + * Driver for LNB supply and control IC LNBH25 + * + * Copyright (C) 2014 NetUP Inc. + * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru> + * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru> + * + * 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 <linux/module.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "lnbh25.h" + +/** + * struct lnbh25_priv - LNBH25 driver private data + * @i2c: pointer to the I2C adapter structure + * @i2c_address: I2C address of LNBH25 SEC chip + * @config: Registers configuration: + * offset 0: 1st register address, always 0x02 (DATA1) + * offset 1: DATA1 register value + * offset 2: DATA2 register value + */ +struct lnbh25_priv { + struct i2c_adapter *i2c; + u8 i2c_address; + u8 config[3]; +}; + +#define LNBH25_STATUS_OFL 0x1 +#define LNBH25_STATUS_VMON 0x4 +#define LNBH25_VSEL_13 0x03 +#define LNBH25_VSEL_18 0x0a + +static int lnbh25_read_vmon(struct lnbh25_priv *priv) +{ + int i, ret; + u8 addr = 0x00; + u8 status[6]; + struct i2c_msg msg[2] = { + { + .addr = priv->i2c_address, + .flags = 0, + .len = 1, + .buf = &addr + }, { + .addr = priv->i2c_address, + .flags = I2C_M_RD, + .len = sizeof(status), + .buf = status + } + }; + + for (i = 0; i < 2; i++) { + ret = i2c_transfer(priv->i2c, &msg[i], 1); + if (ret >= 0 && ret != 1) + ret = -EIO; + if (ret < 0) { + dev_dbg(&priv->i2c->dev, + "%s(): I2C transfer %d failed (%d)\n", + __func__, i, ret); + return ret; + } + } + dev_dbg(&priv->i2c->dev, "%s(): %*ph\n", + __func__, (int) sizeof(status), status); + if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) { + dev_err(&priv->i2c->dev, + "%s(): voltage in failure state, status reg 0x%x\n", + __func__, status[0]); + return -EIO; + } + return 0; +} + +static int lnbh25_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + int ret; + u8 data1_reg; + const char *vsel; + struct lnbh25_priv *priv = fe->sec_priv; + struct i2c_msg msg = { + .addr = priv->i2c_address, + .flags = 0, + .len = sizeof(priv->config), + .buf = priv->config + }; + + switch (voltage) { + case SEC_VOLTAGE_OFF: + data1_reg = 0x00; + vsel = "Off"; + break; + case SEC_VOLTAGE_13: + data1_reg = LNBH25_VSEL_13; + vsel = "13V"; + break; + case SEC_VOLTAGE_18: + data1_reg = LNBH25_VSEL_18; + vsel = "18V"; + break; + default: + return -EINVAL; + } + priv->config[1] = data1_reg; + dev_dbg(&priv->i2c->dev, + "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n", + __func__, vsel, priv->i2c_address, + priv->config[0], priv->config[1], priv->config[2]); + ret = i2c_transfer(priv->i2c, &msg, 1); + if (ret >= 0 && ret != 1) + ret = -EIO; + if (ret < 0) { + dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n", + __func__, ret); + return ret; + } + if (voltage != SEC_VOLTAGE_OFF) { + msleep(120); + ret = lnbh25_read_vmon(priv); + } else { + msleep(20); + ret = 0; + } + return ret; +} + +static void lnbh25_release(struct dvb_frontend *fe) +{ + struct lnbh25_priv *priv = fe->sec_priv; + + dev_dbg(&priv->i2c->dev, "%s()\n", __func__); + lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF); + kfree(fe->sec_priv); + fe->sec_priv = NULL; +} + +struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe, + struct lnbh25_config *cfg, + struct i2c_adapter *i2c) +{ + struct lnbh25_priv *priv; + + dev_dbg(&i2c->dev, "%s()\n", __func__); + priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL); + if (!priv) + return NULL; + priv->i2c_address = (cfg->i2c_address >> 1); + priv->i2c = i2c; + priv->config[0] = 0x02; + priv->config[1] = 0x00; + priv->config[2] = cfg->data2_config; + fe->sec_priv = priv; + if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) { + dev_err(&i2c->dev, + "%s(): no LNBH25 found at I2C addr 0x%02x\n", + __func__, priv->i2c_address); + kfree(priv); + fe->sec_priv = NULL; + return NULL; + } + + fe->ops.release_sec = lnbh25_release; + fe->ops.set_voltage = lnbh25_set_voltage; + + dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n", + __func__, priv->i2c_address); + return fe; +} +EXPORT_SYMBOL(lnbh25_attach); + +MODULE_DESCRIPTION("ST LNBH25 driver"); +MODULE_AUTHOR("info@netup.ru"); +MODULE_LICENSE("GPL"); |