media: dvb-frontends: add LNBH29 LNB supply driver

Add support for STMicroelectronics LNBH29 LNB supply driver.

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/dvb-frontends/Kconfig b/drivers/media/dvb-frontends/Kconfig
index 0482851..847da72 100644 (file)
--- 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 779dfd0..e917916 100644 (file)
--- 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 (file)
index 0000000..410bae0
--- /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 (file)
index 0000000..6179921
--- /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