11b09dd9fSKatsuhiro Suzuki // SPDX-License-Identifier: GPL-2.0
21b09dd9fSKatsuhiro Suzuki //
31b09dd9fSKatsuhiro Suzuki // Driver for LNB supply and control IC STMicroelectronics LNBH29
41b09dd9fSKatsuhiro Suzuki //
51b09dd9fSKatsuhiro Suzuki // Copyright (c) 2018 Socionext Inc.
61b09dd9fSKatsuhiro Suzuki
71b09dd9fSKatsuhiro Suzuki #include <linux/module.h>
81b09dd9fSKatsuhiro Suzuki #include <linux/init.h>
91b09dd9fSKatsuhiro Suzuki #include <linux/slab.h>
101b09dd9fSKatsuhiro Suzuki
111b09dd9fSKatsuhiro Suzuki #include <media/dvb_frontend.h>
121b09dd9fSKatsuhiro Suzuki #include "lnbh29.h"
131b09dd9fSKatsuhiro Suzuki
141b09dd9fSKatsuhiro Suzuki /**
151b09dd9fSKatsuhiro Suzuki * struct lnbh29_priv - LNBH29 driver private data
161b09dd9fSKatsuhiro Suzuki * @i2c: Pointer to the I2C adapter structure
171b09dd9fSKatsuhiro Suzuki * @i2c_address: I2C address of LNBH29 chip
181b09dd9fSKatsuhiro Suzuki * @config: Registers configuration
191b09dd9fSKatsuhiro Suzuki * offset 0: 1st register address, always 0x01 (DATA)
201b09dd9fSKatsuhiro Suzuki * offset 1: DATA register value
211b09dd9fSKatsuhiro Suzuki */
221b09dd9fSKatsuhiro Suzuki struct lnbh29_priv {
231b09dd9fSKatsuhiro Suzuki struct i2c_adapter *i2c;
241b09dd9fSKatsuhiro Suzuki u8 i2c_address;
251b09dd9fSKatsuhiro Suzuki u8 config[2];
261b09dd9fSKatsuhiro Suzuki };
271b09dd9fSKatsuhiro Suzuki
281b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_OLF BIT(0)
291b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_OTF BIT(1)
301b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_VMON BIT(2)
311b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_PNG BIT(3)
321b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_PDO BIT(4)
331b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_MASK GENMASK(2, 0)
341b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_0 0x00
351b09dd9fSKatsuhiro Suzuki /* Min: 13.188V, Typ: 13.667V, Max:14V */
361b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_13 0x03
371b09dd9fSKatsuhiro Suzuki /* Min: 18.158V, Typ: 18.817V, Max:19.475V */
381b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_18 0x07
391b09dd9fSKatsuhiro Suzuki
lnbh29_read_vmon(struct lnbh29_priv * priv)401b09dd9fSKatsuhiro Suzuki static int lnbh29_read_vmon(struct lnbh29_priv *priv)
411b09dd9fSKatsuhiro Suzuki {
421b09dd9fSKatsuhiro Suzuki u8 addr = 0x00;
431b09dd9fSKatsuhiro Suzuki u8 status[2];
441b09dd9fSKatsuhiro Suzuki int ret;
451b09dd9fSKatsuhiro Suzuki struct i2c_msg msg[2] = {
461b09dd9fSKatsuhiro Suzuki {
471b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
481b09dd9fSKatsuhiro Suzuki .flags = 0,
491b09dd9fSKatsuhiro Suzuki .len = 1,
501b09dd9fSKatsuhiro Suzuki .buf = &addr
511b09dd9fSKatsuhiro Suzuki }, {
521b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
531b09dd9fSKatsuhiro Suzuki .flags = I2C_M_RD,
541b09dd9fSKatsuhiro Suzuki .len = sizeof(status),
551b09dd9fSKatsuhiro Suzuki .buf = status
561b09dd9fSKatsuhiro Suzuki }
571b09dd9fSKatsuhiro Suzuki };
581b09dd9fSKatsuhiro Suzuki
591b09dd9fSKatsuhiro Suzuki ret = i2c_transfer(priv->i2c, msg, 2);
601b09dd9fSKatsuhiro Suzuki if (ret >= 0 && ret != 2)
611b09dd9fSKatsuhiro Suzuki ret = -EIO;
621b09dd9fSKatsuhiro Suzuki if (ret < 0) {
631b09dd9fSKatsuhiro Suzuki dev_dbg(&priv->i2c->dev, "LNBH29 I2C transfer failed (%d)\n",
641b09dd9fSKatsuhiro Suzuki ret);
651b09dd9fSKatsuhiro Suzuki return ret;
661b09dd9fSKatsuhiro Suzuki }
671b09dd9fSKatsuhiro Suzuki
681b09dd9fSKatsuhiro Suzuki if (status[0] & (LNBH29_STATUS_OLF | LNBH29_STATUS_VMON)) {
691b09dd9fSKatsuhiro Suzuki dev_err(&priv->i2c->dev,
701b09dd9fSKatsuhiro Suzuki "LNBH29 voltage in failure state, status reg 0x%x\n",
711b09dd9fSKatsuhiro Suzuki status[0]);
721b09dd9fSKatsuhiro Suzuki return -EIO;
731b09dd9fSKatsuhiro Suzuki }
741b09dd9fSKatsuhiro Suzuki
751b09dd9fSKatsuhiro Suzuki return 0;
761b09dd9fSKatsuhiro Suzuki }
771b09dd9fSKatsuhiro Suzuki
lnbh29_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)781b09dd9fSKatsuhiro Suzuki static int lnbh29_set_voltage(struct dvb_frontend *fe,
791b09dd9fSKatsuhiro Suzuki enum fe_sec_voltage voltage)
801b09dd9fSKatsuhiro Suzuki {
811b09dd9fSKatsuhiro Suzuki struct lnbh29_priv *priv = fe->sec_priv;
821b09dd9fSKatsuhiro Suzuki u8 data_reg;
831b09dd9fSKatsuhiro Suzuki int ret;
841b09dd9fSKatsuhiro Suzuki struct i2c_msg msg = {
851b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
861b09dd9fSKatsuhiro Suzuki .flags = 0,
871b09dd9fSKatsuhiro Suzuki .len = sizeof(priv->config),
881b09dd9fSKatsuhiro Suzuki .buf = priv->config
891b09dd9fSKatsuhiro Suzuki };
901b09dd9fSKatsuhiro Suzuki
911b09dd9fSKatsuhiro Suzuki switch (voltage) {
921b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_OFF:
931b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_0;
941b09dd9fSKatsuhiro Suzuki break;
951b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_13:
961b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_13;
971b09dd9fSKatsuhiro Suzuki break;
981b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_18:
991b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_18;
1001b09dd9fSKatsuhiro Suzuki break;
1011b09dd9fSKatsuhiro Suzuki default:
1021b09dd9fSKatsuhiro Suzuki return -EINVAL;
1031b09dd9fSKatsuhiro Suzuki }
1041b09dd9fSKatsuhiro Suzuki priv->config[1] &= ~LNBH29_VSEL_MASK;
1051b09dd9fSKatsuhiro Suzuki priv->config[1] |= data_reg;
1061b09dd9fSKatsuhiro Suzuki
1071b09dd9fSKatsuhiro Suzuki ret = i2c_transfer(priv->i2c, &msg, 1);
1081b09dd9fSKatsuhiro Suzuki if (ret >= 0 && ret != 1)
1091b09dd9fSKatsuhiro Suzuki ret = -EIO;
1101b09dd9fSKatsuhiro Suzuki if (ret < 0) {
1111b09dd9fSKatsuhiro Suzuki dev_err(&priv->i2c->dev, "LNBH29 I2C transfer error (%d)\n",
1121b09dd9fSKatsuhiro Suzuki ret);
1131b09dd9fSKatsuhiro Suzuki return ret;
1141b09dd9fSKatsuhiro Suzuki }
1151b09dd9fSKatsuhiro Suzuki
1161b09dd9fSKatsuhiro Suzuki /* Soft-start time (Vout 0V to 18V) is Typ. 6ms. */
1171b09dd9fSKatsuhiro Suzuki usleep_range(6000, 20000);
1181b09dd9fSKatsuhiro Suzuki
1191b09dd9fSKatsuhiro Suzuki if (voltage == SEC_VOLTAGE_OFF)
1201b09dd9fSKatsuhiro Suzuki return 0;
1211b09dd9fSKatsuhiro Suzuki
1221b09dd9fSKatsuhiro Suzuki return lnbh29_read_vmon(priv);
1231b09dd9fSKatsuhiro Suzuki }
1241b09dd9fSKatsuhiro Suzuki
lnbh29_release(struct dvb_frontend * fe)1251b09dd9fSKatsuhiro Suzuki static void lnbh29_release(struct dvb_frontend *fe)
1261b09dd9fSKatsuhiro Suzuki {
1271b09dd9fSKatsuhiro Suzuki lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF);
1281b09dd9fSKatsuhiro Suzuki kfree(fe->sec_priv);
1291b09dd9fSKatsuhiro Suzuki fe->sec_priv = NULL;
1301b09dd9fSKatsuhiro Suzuki }
1311b09dd9fSKatsuhiro Suzuki
lnbh29_attach(struct dvb_frontend * fe,struct lnbh29_config * cfg,struct i2c_adapter * i2c)1321b09dd9fSKatsuhiro Suzuki struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
1331b09dd9fSKatsuhiro Suzuki struct lnbh29_config *cfg,
1341b09dd9fSKatsuhiro Suzuki struct i2c_adapter *i2c)
1351b09dd9fSKatsuhiro Suzuki {
1361b09dd9fSKatsuhiro Suzuki struct lnbh29_priv *priv;
1371b09dd9fSKatsuhiro Suzuki
1381b09dd9fSKatsuhiro Suzuki priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1391b09dd9fSKatsuhiro Suzuki if (!priv)
1401b09dd9fSKatsuhiro Suzuki return NULL;
1411b09dd9fSKatsuhiro Suzuki
1421b09dd9fSKatsuhiro Suzuki priv->i2c_address = (cfg->i2c_address >> 1);
1431b09dd9fSKatsuhiro Suzuki priv->i2c = i2c;
1441b09dd9fSKatsuhiro Suzuki priv->config[0] = 0x01;
1451b09dd9fSKatsuhiro Suzuki priv->config[1] = cfg->data_config;
1461b09dd9fSKatsuhiro Suzuki fe->sec_priv = priv;
1471b09dd9fSKatsuhiro Suzuki
1481b09dd9fSKatsuhiro Suzuki if (lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF)) {
1491b09dd9fSKatsuhiro Suzuki dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n",
1501b09dd9fSKatsuhiro Suzuki priv->i2c_address);
1511b09dd9fSKatsuhiro Suzuki kfree(priv);
1521b09dd9fSKatsuhiro Suzuki fe->sec_priv = NULL;
1531b09dd9fSKatsuhiro Suzuki return NULL;
1541b09dd9fSKatsuhiro Suzuki }
1551b09dd9fSKatsuhiro Suzuki
1561b09dd9fSKatsuhiro Suzuki fe->ops.release_sec = lnbh29_release;
1571b09dd9fSKatsuhiro Suzuki fe->ops.set_voltage = lnbh29_set_voltage;
1581b09dd9fSKatsuhiro Suzuki
1591b09dd9fSKatsuhiro Suzuki dev_info(&i2c->dev, "LNBH29 attached at I2C addr 0x%02x\n",
1601b09dd9fSKatsuhiro Suzuki priv->i2c_address);
1611b09dd9fSKatsuhiro Suzuki
1621b09dd9fSKatsuhiro Suzuki return fe;
1631b09dd9fSKatsuhiro Suzuki }
1641b09dd9fSKatsuhiro Suzuki EXPORT_SYMBOL(lnbh29_attach);
1651b09dd9fSKatsuhiro Suzuki
1661b09dd9fSKatsuhiro Suzuki MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>");
1671b09dd9fSKatsuhiro Suzuki MODULE_DESCRIPTION("STMicroelectronics LNBH29 driver");
1681b09dd9fSKatsuhiro Suzuki MODULE_LICENSE("GPL v2");
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