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Subject[PATCH v2] media: dvb-frontends: add LNBH29 LNB supply driver
Date
Add support for STMicroelectronics LNBH29 LNB supply driver.

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>

---

Changes since v1:
- Fix wrong I2C transfer routine
- Remove unused headers
---
drivers/media/dvb-frontends/Kconfig | 10 ++
drivers/media/dvb-frontends/Makefile | 1 +
drivers/media/dvb-frontends/lnbh29.c | 168 +++++++++++++++++++++++++++
drivers/media/dvb-frontends/lnbh29.h | 36 ++++++
4 files changed, 215 insertions(+)
create mode 100644 drivers/media/dvb-frontends/lnbh29.c
create mode 100644 drivers/media/dvb-frontends/lnbh29.h

diff --git a/drivers/media/dvb-frontends/Kconfig b/drivers/media/dvb-frontends/Kconfig
index 048285134cdf..847da72d1256 100644
--- a/drivers/media/dvb-frontends/Kconfig
+++ b/drivers/media/dvb-frontends/Kconfig
@@ -791,6 +791,16 @@ config DVB_LNBH25
An SEC control chip.
Say Y when you want to support this chip.

+config DVB_LNBH29
+ tristate "LNBH29 SEC controller"
+ depends on DVB_CORE && I2C
+ default m if !MEDIA_SUBDRV_AUTOSELECT
+ help
+ LNB power supply and control voltage
+ regulator chip with step-up converter
+ and I2C interface for STMicroelectronics LNBH29.
+ Say Y when you want to support this chip.
+
config DVB_LNBP21
tristate "LNBP21/LNBH24 SEC controllers"
depends on DVB_CORE && I2C
diff --git a/drivers/media/dvb-frontends/Makefile b/drivers/media/dvb-frontends/Makefile
index 779dfd027b24..e9179162658c 100644
--- a/drivers/media/dvb-frontends/Makefile
+++ b/drivers/media/dvb-frontends/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_DVB_LGDT3306A) += lgdt3306a.o
obj-$(CONFIG_DVB_LG2160) += lg2160.o
obj-$(CONFIG_DVB_CX24123) += cx24123.o
obj-$(CONFIG_DVB_LNBH25) += lnbh25.o
+obj-$(CONFIG_DVB_LNBH29) += lnbh29.o
obj-$(CONFIG_DVB_LNBP21) += lnbp21.o
obj-$(CONFIG_DVB_LNBP22) += lnbp22.o
obj-$(CONFIG_DVB_ISL6405) += isl6405.o
diff --git a/drivers/media/dvb-frontends/lnbh29.c b/drivers/media/dvb-frontends/lnbh29.c
new file mode 100644
index 000000000000..410bae099c32
--- /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");
diff --git a/drivers/media/dvb-frontends/lnbh29.h b/drivers/media/dvb-frontends/lnbh29.h
new file mode 100644
index 000000000000..6179921520d9
--- /dev/null
+++ b/drivers/media/dvb-frontends/lnbh29.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Driver for LNB supply and control IC STMicroelectronics LNBH29
+ *
+ * Copyright (c) 2018 Socionext Inc.
+ */
+
+#ifndef LNBH29_H
+#define LNBH29_H
+
+#include <linux/i2c.h>
+#include <linux/dvb/frontend.h>
+
+/* Using very low E.S.R. capacitors or ceramic caps */
+#define LNBH29_DATA_COMP BIT(3)
+
+struct lnbh29_config {
+ u8 i2c_address;
+ u8 data_config;
+};
+
+#if IS_REACHABLE(CONFIG_DVB_LNBH29)
+struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
+ struct lnbh29_config *cfg,
+ struct i2c_adapter *i2c);
+#else
+static inline struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
+ struct lnbh29_config *cfg,
+ struct i2c_adapter *i2c)
+{
+ printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+ return NULL;
+}
+#endif
+
+#endif
--
2.18.0
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