lm3533-ctrlbank.c 3.6 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
  4. *
  5. * Copyright (C) 2011-2012 Texas Instruments
  6. *
  7. * Author: Johan Hovold <jhovold@gmail.com>
  8. */
  9. #include <linux/device.h>
  10. #include <linux/module.h>
  11. #include <linux/mfd/lm3533.h>
  12. #define LM3533_MAX_CURRENT_MIN 5000
  13. #define LM3533_MAX_CURRENT_MAX 29800
  14. #define LM3533_MAX_CURRENT_STEP 800
  15. #define LM3533_PWM_MAX 0x3f
  16. #define LM3533_REG_PWM_BASE 0x14
  17. #define LM3533_REG_MAX_CURRENT_BASE 0x1f
  18. #define LM3533_REG_CTRLBANK_ENABLE 0x27
  19. #define LM3533_REG_BRIGHTNESS_BASE 0x40
  20. static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  21. {
  22. return base + cb->id;
  23. }
  24. int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
  25. {
  26. u8 mask;
  27. int ret;
  28. dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  29. mask = 1 << cb->id;
  30. ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
  31. mask, mask);
  32. if (ret)
  33. dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
  34. return ret;
  35. }
  36. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  37. int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
  38. {
  39. u8 mask;
  40. int ret;
  41. dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  42. mask = 1 << cb->id;
  43. ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
  44. if (ret)
  45. dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
  46. return ret;
  47. }
  48. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  49. /*
  50. * Full-scale current.
  51. *
  52. * imax 5000 - 29800 uA (800 uA step)
  53. */
  54. int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
  55. {
  56. u8 reg;
  57. u8 val;
  58. int ret;
  59. if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
  60. return -EINVAL;
  61. val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
  62. reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
  63. ret = lm3533_write(cb->lm3533, reg, val);
  64. if (ret)
  65. dev_err(cb->dev, "failed to set max current\n");
  66. return ret;
  67. }
  68. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  69. int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
  70. {
  71. u8 reg;
  72. int ret;
  73. reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
  74. ret = lm3533_write(cb->lm3533, reg, val);
  75. if (ret)
  76. dev_err(cb->dev, "failed to set brightness\n");
  77. return ret;
  78. }
  79. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
  80. int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
  81. {
  82. u8 reg;
  83. int ret;
  84. reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
  85. ret = lm3533_read(cb->lm3533, reg, val);
  86. if (ret)
  87. dev_err(cb->dev, "failed to get brightness\n");
  88. return ret;
  89. }
  90. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
  91. /*
  92. * PWM-input control mask:
  93. *
  94. * bit 5 - PWM-input enabled in Zone 4
  95. * bit 4 - PWM-input enabled in Zone 3
  96. * bit 3 - PWM-input enabled in Zone 2
  97. * bit 2 - PWM-input enabled in Zone 1
  98. * bit 1 - PWM-input enabled in Zone 0
  99. * bit 0 - PWM-input enabled
  100. */
  101. int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
  102. {
  103. u8 reg;
  104. int ret;
  105. if (val > LM3533_PWM_MAX)
  106. return -EINVAL;
  107. reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
  108. ret = lm3533_write(cb->lm3533, reg, val);
  109. if (ret)
  110. dev_err(cb->dev, "failed to set PWM mask\n");
  111. return ret;
  112. }
  113. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
  114. int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
  115. {
  116. u8 reg;
  117. int ret;
  118. reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
  119. ret = lm3533_read(cb->lm3533, reg, val);
  120. if (ret)
  121. dev_err(cb->dev, "failed to get PWM mask\n");
  122. return ret;
  123. }
  124. EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
  125. MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
  126. MODULE_DESCRIPTION("LM3533 Control Bank interface");
  127. MODULE_LICENSE("GPL");