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/lnbh29.c b/drivers/media/dvb-frontends/lnbh29.c
new file mode 100644
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");