lnbh25.c 4.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * lnbh25.c
  4. *
  5. * Driver for LNB supply and control IC LNBH25
  6. *
  7. * Copyright (C) 2014 NetUP Inc.
  8. * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
  9. * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
  10. */
  11. #include <linux/module.h>
  12. #include <linux/init.h>
  13. #include <linux/string.h>
  14. #include <linux/slab.h>
  15. #include <media/dvb_frontend.h>
  16. #include "lnbh25.h"
  17. /**
  18. * struct lnbh25_priv - LNBH25 driver private data
  19. * @i2c: pointer to the I2C adapter structure
  20. * @i2c_address: I2C address of LNBH25 SEC chip
  21. * @config: Registers configuration:
  22. * offset 0: 1st register address, always 0x02 (DATA1)
  23. * offset 1: DATA1 register value
  24. * offset 2: DATA2 register value
  25. */
  26. struct lnbh25_priv {
  27. struct i2c_adapter *i2c;
  28. u8 i2c_address;
  29. u8 config[3];
  30. };
  31. #define LNBH25_STATUS_OFL 0x1
  32. #define LNBH25_STATUS_VMON 0x4
  33. #define LNBH25_VSEL_13 0x03
  34. #define LNBH25_VSEL_18 0x0a
  35. static int lnbh25_read_vmon(struct lnbh25_priv *priv)
  36. {
  37. int i, ret;
  38. u8 addr = 0x00;
  39. u8 status[6];
  40. struct i2c_msg msg[2] = {
  41. {
  42. .addr = priv->i2c_address,
  43. .flags = 0,
  44. .len = 1,
  45. .buf = &addr
  46. }, {
  47. .addr = priv->i2c_address,
  48. .flags = I2C_M_RD,
  49. .len = sizeof(status),
  50. .buf = status
  51. }
  52. };
  53. for (i = 0; i < 2; i++) {
  54. ret = i2c_transfer(priv->i2c, &msg[i], 1);
  55. if (ret >= 0 && ret != 1)
  56. ret = -EIO;
  57. if (ret < 0) {
  58. dev_dbg(&priv->i2c->dev,
  59. "%s(): I2C transfer %d failed (%d)\n",
  60. __func__, i, ret);
  61. return ret;
  62. }
  63. }
  64. dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
  65. __func__, (int) sizeof(status), status);
  66. if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
  67. dev_err(&priv->i2c->dev,
  68. "%s(): voltage in failure state, status reg 0x%x\n",
  69. __func__, status[0]);
  70. return -EIO;
  71. }
  72. return 0;
  73. }
  74. static int lnbh25_set_voltage(struct dvb_frontend *fe,
  75. enum fe_sec_voltage voltage)
  76. {
  77. int ret;
  78. u8 data1_reg;
  79. const char *vsel;
  80. struct lnbh25_priv *priv = fe->sec_priv;
  81. struct i2c_msg msg = {
  82. .addr = priv->i2c_address,
  83. .flags = 0,
  84. .len = sizeof(priv->config),
  85. .buf = priv->config
  86. };
  87. switch (voltage) {
  88. case SEC_VOLTAGE_OFF:
  89. data1_reg = 0x00;
  90. vsel = "Off";
  91. break;
  92. case SEC_VOLTAGE_13:
  93. data1_reg = LNBH25_VSEL_13;
  94. vsel = "13V";
  95. break;
  96. case SEC_VOLTAGE_18:
  97. data1_reg = LNBH25_VSEL_18;
  98. vsel = "18V";
  99. break;
  100. default:
  101. return -EINVAL;
  102. }
  103. priv->config[1] = data1_reg;
  104. dev_dbg(&priv->i2c->dev,
  105. "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
  106. __func__, vsel, priv->i2c_address,
  107. priv->config[0], priv->config[1], priv->config[2]);
  108. ret = i2c_transfer(priv->i2c, &msg, 1);
  109. if (ret >= 0 && ret != 1)
  110. ret = -EIO;
  111. if (ret < 0) {
  112. dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
  113. __func__, ret);
  114. return ret;
  115. }
  116. if (voltage != SEC_VOLTAGE_OFF) {
  117. msleep(120);
  118. ret = lnbh25_read_vmon(priv);
  119. } else {
  120. msleep(20);
  121. ret = 0;
  122. }
  123. return ret;
  124. }
  125. static void lnbh25_release(struct dvb_frontend *fe)
  126. {
  127. struct lnbh25_priv *priv = fe->sec_priv;
  128. dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
  129. lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
  130. kfree(fe->sec_priv);
  131. fe->sec_priv = NULL;
  132. }
  133. struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
  134. struct lnbh25_config *cfg,
  135. struct i2c_adapter *i2c)
  136. {
  137. struct lnbh25_priv *priv;
  138. dev_dbg(&i2c->dev, "%s()\n", __func__);
  139. priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
  140. if (!priv)
  141. return NULL;
  142. priv->i2c_address = (cfg->i2c_address >> 1);
  143. priv->i2c = i2c;
  144. priv->config[0] = 0x02;
  145. priv->config[1] = 0x00;
  146. priv->config[2] = cfg->data2_config;
  147. fe->sec_priv = priv;
  148. if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
  149. dev_err(&i2c->dev,
  150. "%s(): no LNBH25 found at I2C addr 0x%02x\n",
  151. __func__, priv->i2c_address);
  152. kfree(priv);
  153. fe->sec_priv = NULL;
  154. return NULL;
  155. }
  156. fe->ops.release_sec = lnbh25_release;
  157. fe->ops.set_voltage = lnbh25_set_voltage;
  158. dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
  159. __func__, priv->i2c_address);
  160. return fe;
  161. }
  162. EXPORT_SYMBOL(lnbh25_attach);
  163. MODULE_DESCRIPTION("ST LNBH25 driver");
  164. MODULE_AUTHOR("info@netup.ru");
  165. MODULE_LICENSE("GPL");