[media] lnbh25: LNBH25 SEC controller driver

Add DVB SEC frontend driver for STM LNBH25PQR chip.

[mchehab@osg.samsung.com: fix merge conflict:
 fe_sec_voltage_t should not be used in kernelspace anymore.
 instead, it should use enum fe_sec_voltage]
Signed-off-by: Kozlov Sergey <serjk@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

4 files changed, 254 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/Kconfig b/drivers/media/dvb-frontends/Kconfig
index ec628c482cdf..82b21b92f33b 100644
--- a/drivers/media/dvb-frontends/Kconfig
+++ b/drivers/media/dvb-frontends/Kconfig
@@ -713,6 +713,14 @@ comment "SEC control devices for DVB-S"
 
 source "drivers/media/dvb-frontends/drx39xyj/Kconfig"
 
+config DVB_LNBH25
+        tristate "LNBH25 SEC controller"
+        depends on DVB_CORE && I2C
+        default m if !MEDIA_SUBDRV_AUTOSELECT
+        help
+          An SEC control chip.
+          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 0a1bf69cb79a..07d962a29763 100644
--- a/drivers/media/dvb-frontends/Makefile
+++ b/drivers/media/dvb-frontends/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_DVB_LGDT3305) += lgdt3305.o
 obj-$(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_LNBP21) += lnbp21.o
 obj-$(CONFIG_DVB_LNBP22) += lnbp22.o
 obj-$(CONFIG_DVB_ISL6405) += isl6405.o
diff --git a/drivers/media/dvb-frontends/lnbh25.c b/drivers/media/dvb-frontends/lnbh25.c
new file mode 100644
index 000000000000..ef3021e964be
--- /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 "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;
+                }
+        }
+        print_hex_dump_bytes("lnbh25_read_vmon: ",
+                DUMP_PREFIX_OFFSET, status, sizeof(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_err(&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");
diff --git a/drivers/media/dvb-frontends/lnbh25.h b/drivers/media/dvb-frontends/lnbh25.h
new file mode 100644
index 000000000000..69f30e21f6b3
--- /dev/null
+++ b/drivers/media/dvb-frontends/lnbh25.h
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+#ifndef LNBH25_H
+#define LNBH25_H
+
+#include <linux/i2c.h>
+#include <linux/kconfig.h>
+#include <linux/dvb/frontend.h>
+
+/* 22 kHz tone enabled. Tone output controlled by DSQIN pin */
+#define LNBH25_TEN      0x01
+/* Low power mode activated (used only with 22 kHz tone output disabled) */
+#define LNBH25_LPM      0x02
+/* DSQIN input pin is set to receive external 22 kHz TTL signal source */
+#define LNBH25_EXTM     0x04
+
+struct lnbh25_config {
+        u8      i2c_address;
+        u8      data2_config;
+};
+
+#if IS_REACHABLE(CONFIG_DVB_LNBH25)
+struct dvb_frontend *lnbh25_attach(
+        struct dvb_frontend *fe,
+        struct lnbh25_config *cfg,
+        struct i2c_adapter *i2c);
+#else
+static inline dvb_frontend *lnbh25_attach(
+        struct dvb_frontend *fe,
+        struct lnbh25_config *cfg,
+        struct i2c_adapter *i2c)
+{
+        printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+        return NULL;
+}
+#endif
+
+#endif