diff options
Diffstat (limited to 'drivers/media/dvb-frontends/lnbh29.c')
| -rw-r--r-- | drivers/media/dvb-frontends/lnbh29.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/lnbh29.c b/drivers/media/dvb-frontends/lnbh29.c new file mode 100644 index 000000000..410bae099 --- /dev/null +++ b/drivers/media/dvb-frontends/lnbh29.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Driver for LNB supply and control IC STMicroelectronics LNBH29 +// +// Copyright (c) 2018 Socionext Inc. + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "lnbh29.h" + +/** + * struct lnbh29_priv - LNBH29 driver private data + * @i2c: Pointer to the I2C adapter structure + * @i2c_address: I2C address of LNBH29 chip + * @config: Registers configuration + * offset 0: 1st register address, always 0x01 (DATA) + * offset 1: DATA register value + */ +struct lnbh29_priv { + struct i2c_adapter *i2c; + u8 i2c_address; + u8 config[2]; +}; + +#define LNBH29_STATUS_OLF BIT(0) +#define LNBH29_STATUS_OTF BIT(1) +#define LNBH29_STATUS_VMON BIT(2) +#define LNBH29_STATUS_PNG BIT(3) +#define LNBH29_STATUS_PDO BIT(4) +#define LNBH29_VSEL_MASK GENMASK(2, 0) +#define LNBH29_VSEL_0 0x00 +/* Min: 13.188V, Typ: 13.667V, Max:14V */ +#define LNBH29_VSEL_13 0x03 +/* Min: 18.158V, Typ: 18.817V, Max:19.475V */ +#define LNBH29_VSEL_18 0x07 + +static int lnbh29_read_vmon(struct lnbh29_priv *priv) +{ + u8 addr = 0x00; + u8 status[2]; + int ret; + 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 + } + }; + + ret = i2c_transfer(priv->i2c, msg, 2); + if (ret >= 0 && ret != 2) + ret = -EIO; + if (ret < 0) { + dev_dbg(&priv->i2c->dev, "LNBH29 I2C transfer failed (%d)\n", + ret); + return ret; + } + + if (status[0] & (LNBH29_STATUS_OLF | LNBH29_STATUS_VMON)) { + dev_err(&priv->i2c->dev, + "LNBH29 voltage in failure state, status reg 0x%x\n", + status[0]); + return -EIO; + } + + return 0; +} + +static int lnbh29_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + struct lnbh29_priv *priv = fe->sec_priv; + u8 data_reg; + int ret; + struct i2c_msg msg = { + .addr = priv->i2c_address, + .flags = 0, + .len = sizeof(priv->config), + .buf = priv->config + }; + + switch (voltage) { + case SEC_VOLTAGE_OFF: + data_reg = LNBH29_VSEL_0; + break; + case SEC_VOLTAGE_13: + data_reg = LNBH29_VSEL_13; + break; + case SEC_VOLTAGE_18: + data_reg = LNBH29_VSEL_18; + break; + default: + return -EINVAL; + } + priv->config[1] &= ~LNBH29_VSEL_MASK; + priv->config[1] |= data_reg; + + ret = i2c_transfer(priv->i2c, &msg, 1); + if (ret >= 0 && ret != 1) + ret = -EIO; + if (ret < 0) { + dev_err(&priv->i2c->dev, "LNBH29 I2C transfer error (%d)\n", + ret); + return ret; + } + + /* Soft-start time (Vout 0V to 18V) is Typ. 6ms. */ + usleep_range(6000, 20000); + + if (voltage == SEC_VOLTAGE_OFF) + return 0; + + return lnbh29_read_vmon(priv); +} + +static void lnbh29_release(struct dvb_frontend *fe) +{ + lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF); + kfree(fe->sec_priv); + fe->sec_priv = NULL; +} + +struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe, + struct lnbh29_config *cfg, + struct i2c_adapter *i2c) +{ + struct lnbh29_priv *priv; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return NULL; + + priv->i2c_address = (cfg->i2c_address >> 1); + priv->i2c = i2c; + priv->config[0] = 0x01; + priv->config[1] = cfg->data_config; + fe->sec_priv = priv; + + if (lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF)) { + dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n", + priv->i2c_address); + kfree(priv); + fe->sec_priv = NULL; + return NULL; + } + + fe->ops.release_sec = lnbh29_release; + fe->ops.set_voltage = lnbh29_set_voltage; + + dev_info(&i2c->dev, "LNBH29 attached at I2C addr 0x%02x\n", + priv->i2c_address); + + return fe; +} +EXPORT_SYMBOL(lnbh29_attach); + +MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>"); +MODULE_DESCRIPTION("STMicroelectronics LNBH29 driver"); +MODULE_LICENSE("GPL v2"); |