1*1b09dd9fSKatsuhiro Suzuki // SPDX-License-Identifier: GPL-2.0
2*1b09dd9fSKatsuhiro Suzuki //
3*1b09dd9fSKatsuhiro Suzuki // Driver for LNB supply and control IC STMicroelectronics LNBH29
4*1b09dd9fSKatsuhiro Suzuki //
5*1b09dd9fSKatsuhiro Suzuki // Copyright (c) 2018 Socionext Inc.
6*1b09dd9fSKatsuhiro Suzuki
7*1b09dd9fSKatsuhiro Suzuki #include <linux/module.h>
8*1b09dd9fSKatsuhiro Suzuki #include <linux/init.h>
9*1b09dd9fSKatsuhiro Suzuki #include <linux/slab.h>
10*1b09dd9fSKatsuhiro Suzuki
11*1b09dd9fSKatsuhiro Suzuki #include <media/dvb_frontend.h>
12*1b09dd9fSKatsuhiro Suzuki #include "lnbh29.h"
13*1b09dd9fSKatsuhiro Suzuki
14*1b09dd9fSKatsuhiro Suzuki /**
15*1b09dd9fSKatsuhiro Suzuki * struct lnbh29_priv - LNBH29 driver private data
16*1b09dd9fSKatsuhiro Suzuki * @i2c: Pointer to the I2C adapter structure
17*1b09dd9fSKatsuhiro Suzuki * @i2c_address: I2C address of LNBH29 chip
18*1b09dd9fSKatsuhiro Suzuki * @config: Registers configuration
19*1b09dd9fSKatsuhiro Suzuki * offset 0: 1st register address, always 0x01 (DATA)
20*1b09dd9fSKatsuhiro Suzuki * offset 1: DATA register value
21*1b09dd9fSKatsuhiro Suzuki */
22*1b09dd9fSKatsuhiro Suzuki struct lnbh29_priv {
23*1b09dd9fSKatsuhiro Suzuki struct i2c_adapter *i2c;
24*1b09dd9fSKatsuhiro Suzuki u8 i2c_address;
25*1b09dd9fSKatsuhiro Suzuki u8 config[2];
26*1b09dd9fSKatsuhiro Suzuki };
27*1b09dd9fSKatsuhiro Suzuki
28*1b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_OLF BIT(0)
29*1b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_OTF BIT(1)
30*1b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_VMON BIT(2)
31*1b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_PNG BIT(3)
32*1b09dd9fSKatsuhiro Suzuki #define LNBH29_STATUS_PDO BIT(4)
33*1b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_MASK GENMASK(2, 0)
34*1b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_0 0x00
35*1b09dd9fSKatsuhiro Suzuki /* Min: 13.188V, Typ: 13.667V, Max:14V */
36*1b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_13 0x03
37*1b09dd9fSKatsuhiro Suzuki /* Min: 18.158V, Typ: 18.817V, Max:19.475V */
38*1b09dd9fSKatsuhiro Suzuki #define LNBH29_VSEL_18 0x07
39*1b09dd9fSKatsuhiro Suzuki
lnbh29_read_vmon(struct lnbh29_priv * priv)40*1b09dd9fSKatsuhiro Suzuki static int lnbh29_read_vmon(struct lnbh29_priv *priv)
41*1b09dd9fSKatsuhiro Suzuki {
42*1b09dd9fSKatsuhiro Suzuki u8 addr = 0x00;
43*1b09dd9fSKatsuhiro Suzuki u8 status[2];
44*1b09dd9fSKatsuhiro Suzuki int ret;
45*1b09dd9fSKatsuhiro Suzuki struct i2c_msg msg[2] = {
46*1b09dd9fSKatsuhiro Suzuki {
47*1b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
48*1b09dd9fSKatsuhiro Suzuki .flags = 0,
49*1b09dd9fSKatsuhiro Suzuki .len = 1,
50*1b09dd9fSKatsuhiro Suzuki .buf = &addr
51*1b09dd9fSKatsuhiro Suzuki }, {
52*1b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
53*1b09dd9fSKatsuhiro Suzuki .flags = I2C_M_RD,
54*1b09dd9fSKatsuhiro Suzuki .len = sizeof(status),
55*1b09dd9fSKatsuhiro Suzuki .buf = status
56*1b09dd9fSKatsuhiro Suzuki }
57*1b09dd9fSKatsuhiro Suzuki };
58*1b09dd9fSKatsuhiro Suzuki
59*1b09dd9fSKatsuhiro Suzuki ret = i2c_transfer(priv->i2c, msg, 2);
60*1b09dd9fSKatsuhiro Suzuki if (ret >= 0 && ret != 2)
61*1b09dd9fSKatsuhiro Suzuki ret = -EIO;
62*1b09dd9fSKatsuhiro Suzuki if (ret < 0) {
63*1b09dd9fSKatsuhiro Suzuki dev_dbg(&priv->i2c->dev, "LNBH29 I2C transfer failed (%d)\n",
64*1b09dd9fSKatsuhiro Suzuki ret);
65*1b09dd9fSKatsuhiro Suzuki return ret;
66*1b09dd9fSKatsuhiro Suzuki }
67*1b09dd9fSKatsuhiro Suzuki
68*1b09dd9fSKatsuhiro Suzuki if (status[0] & (LNBH29_STATUS_OLF | LNBH29_STATUS_VMON)) {
69*1b09dd9fSKatsuhiro Suzuki dev_err(&priv->i2c->dev,
70*1b09dd9fSKatsuhiro Suzuki "LNBH29 voltage in failure state, status reg 0x%x\n",
71*1b09dd9fSKatsuhiro Suzuki status[0]);
72*1b09dd9fSKatsuhiro Suzuki return -EIO;
73*1b09dd9fSKatsuhiro Suzuki }
74*1b09dd9fSKatsuhiro Suzuki
75*1b09dd9fSKatsuhiro Suzuki return 0;
76*1b09dd9fSKatsuhiro Suzuki }
77*1b09dd9fSKatsuhiro Suzuki
lnbh29_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)78*1b09dd9fSKatsuhiro Suzuki static int lnbh29_set_voltage(struct dvb_frontend *fe,
79*1b09dd9fSKatsuhiro Suzuki enum fe_sec_voltage voltage)
80*1b09dd9fSKatsuhiro Suzuki {
81*1b09dd9fSKatsuhiro Suzuki struct lnbh29_priv *priv = fe->sec_priv;
82*1b09dd9fSKatsuhiro Suzuki u8 data_reg;
83*1b09dd9fSKatsuhiro Suzuki int ret;
84*1b09dd9fSKatsuhiro Suzuki struct i2c_msg msg = {
85*1b09dd9fSKatsuhiro Suzuki .addr = priv->i2c_address,
86*1b09dd9fSKatsuhiro Suzuki .flags = 0,
87*1b09dd9fSKatsuhiro Suzuki .len = sizeof(priv->config),
88*1b09dd9fSKatsuhiro Suzuki .buf = priv->config
89*1b09dd9fSKatsuhiro Suzuki };
90*1b09dd9fSKatsuhiro Suzuki
91*1b09dd9fSKatsuhiro Suzuki switch (voltage) {
92*1b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_OFF:
93*1b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_0;
94*1b09dd9fSKatsuhiro Suzuki break;
95*1b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_13:
96*1b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_13;
97*1b09dd9fSKatsuhiro Suzuki break;
98*1b09dd9fSKatsuhiro Suzuki case SEC_VOLTAGE_18:
99*1b09dd9fSKatsuhiro Suzuki data_reg = LNBH29_VSEL_18;
100*1b09dd9fSKatsuhiro Suzuki break;
101*1b09dd9fSKatsuhiro Suzuki default:
102*1b09dd9fSKatsuhiro Suzuki return -EINVAL;
103*1b09dd9fSKatsuhiro Suzuki }
104*1b09dd9fSKatsuhiro Suzuki priv->config[1] &= ~LNBH29_VSEL_MASK;
105*1b09dd9fSKatsuhiro Suzuki priv->config[1] |= data_reg;
106*1b09dd9fSKatsuhiro Suzuki
107*1b09dd9fSKatsuhiro Suzuki ret = i2c_transfer(priv->i2c, &msg, 1);
108*1b09dd9fSKatsuhiro Suzuki if (ret >= 0 && ret != 1)
109*1b09dd9fSKatsuhiro Suzuki ret = -EIO;
110*1b09dd9fSKatsuhiro Suzuki if (ret < 0) {
111*1b09dd9fSKatsuhiro Suzuki dev_err(&priv->i2c->dev, "LNBH29 I2C transfer error (%d)\n",
112*1b09dd9fSKatsuhiro Suzuki ret);
113*1b09dd9fSKatsuhiro Suzuki return ret;
114*1b09dd9fSKatsuhiro Suzuki }
115*1b09dd9fSKatsuhiro Suzuki
116*1b09dd9fSKatsuhiro Suzuki /* Soft-start time (Vout 0V to 18V) is Typ. 6ms. */
117*1b09dd9fSKatsuhiro Suzuki usleep_range(6000, 20000);
118*1b09dd9fSKatsuhiro Suzuki
119*1b09dd9fSKatsuhiro Suzuki if (voltage == SEC_VOLTAGE_OFF)
120*1b09dd9fSKatsuhiro Suzuki return 0;
121*1b09dd9fSKatsuhiro Suzuki
122*1b09dd9fSKatsuhiro Suzuki return lnbh29_read_vmon(priv);
123*1b09dd9fSKatsuhiro Suzuki }
124*1b09dd9fSKatsuhiro Suzuki
lnbh29_release(struct dvb_frontend * fe)125*1b09dd9fSKatsuhiro Suzuki static void lnbh29_release(struct dvb_frontend *fe)
126*1b09dd9fSKatsuhiro Suzuki {
127*1b09dd9fSKatsuhiro Suzuki lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF);
128*1b09dd9fSKatsuhiro Suzuki kfree(fe->sec_priv);
129*1b09dd9fSKatsuhiro Suzuki fe->sec_priv = NULL;
130*1b09dd9fSKatsuhiro Suzuki }
131*1b09dd9fSKatsuhiro Suzuki
lnbh29_attach(struct dvb_frontend * fe,struct lnbh29_config * cfg,struct i2c_adapter * i2c)132*1b09dd9fSKatsuhiro Suzuki struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
133*1b09dd9fSKatsuhiro Suzuki struct lnbh29_config *cfg,
134*1b09dd9fSKatsuhiro Suzuki struct i2c_adapter *i2c)
135*1b09dd9fSKatsuhiro Suzuki {
136*1b09dd9fSKatsuhiro Suzuki struct lnbh29_priv *priv;
137*1b09dd9fSKatsuhiro Suzuki
138*1b09dd9fSKatsuhiro Suzuki priv = kzalloc(sizeof(*priv), GFP_KERNEL);
139*1b09dd9fSKatsuhiro Suzuki if (!priv)
140*1b09dd9fSKatsuhiro Suzuki return NULL;
141*1b09dd9fSKatsuhiro Suzuki
142*1b09dd9fSKatsuhiro Suzuki priv->i2c_address = (cfg->i2c_address >> 1);
143*1b09dd9fSKatsuhiro Suzuki priv->i2c = i2c;
144*1b09dd9fSKatsuhiro Suzuki priv->config[0] = 0x01;
145*1b09dd9fSKatsuhiro Suzuki priv->config[1] = cfg->data_config;
146*1b09dd9fSKatsuhiro Suzuki fe->sec_priv = priv;
147*1b09dd9fSKatsuhiro Suzuki
148*1b09dd9fSKatsuhiro Suzuki if (lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF)) {
149*1b09dd9fSKatsuhiro Suzuki dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n",
150*1b09dd9fSKatsuhiro Suzuki priv->i2c_address);
151*1b09dd9fSKatsuhiro Suzuki kfree(priv);
152*1b09dd9fSKatsuhiro Suzuki fe->sec_priv = NULL;
153*1b09dd9fSKatsuhiro Suzuki return NULL;
154*1b09dd9fSKatsuhiro Suzuki }
155*1b09dd9fSKatsuhiro Suzuki
156*1b09dd9fSKatsuhiro Suzuki fe->ops.release_sec = lnbh29_release;
157*1b09dd9fSKatsuhiro Suzuki fe->ops.set_voltage = lnbh29_set_voltage;
158*1b09dd9fSKatsuhiro Suzuki
159*1b09dd9fSKatsuhiro Suzuki dev_info(&i2c->dev, "LNBH29 attached at I2C addr 0x%02x\n",
160*1b09dd9fSKatsuhiro Suzuki priv->i2c_address);
161*1b09dd9fSKatsuhiro Suzuki
162*1b09dd9fSKatsuhiro Suzuki return fe;
163*1b09dd9fSKatsuhiro Suzuki }
164*1b09dd9fSKatsuhiro Suzuki EXPORT_SYMBOL(lnbh29_attach);
165*1b09dd9fSKatsuhiro Suzuki
166*1b09dd9fSKatsuhiro Suzuki MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>");
167*1b09dd9fSKatsuhiro Suzuki MODULE_DESCRIPTION("STMicroelectronics LNBH29 driver");
168*1b09dd9fSKatsuhiro Suzuki MODULE_LICENSE("GPL v2");
169