lt3651-charger.c 5.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Driver for Analog Devices (Linear Technology) LT3651 charger IC.
  4. * Copyright (C) 2017, Topic Embedded Products
  5. */
  6. #include <linux/device.h>
  7. #include <linux/gpio/consumer.h>
  8. #include <linux/init.h>
  9. #include <linux/interrupt.h>
  10. #include <linux/kernel.h>
  11. #include <linux/module.h>
  12. #include <linux/platform_device.h>
  13. #include <linux/power_supply.h>
  14. #include <linux/slab.h>
  15. #include <linux/of.h>
  16. struct lt3651_charger {
  17. struct power_supply *charger;
  18. struct power_supply_desc charger_desc;
  19. struct gpio_desc *acpr_gpio;
  20. struct gpio_desc *fault_gpio;
  21. struct gpio_desc *chrg_gpio;
  22. };
  23. static irqreturn_t lt3651_charger_irq(int irq, void *devid)
  24. {
  25. struct power_supply *charger = devid;
  26. power_supply_changed(charger);
  27. return IRQ_HANDLED;
  28. }
  29. static inline struct lt3651_charger *psy_to_lt3651_charger(
  30. struct power_supply *psy)
  31. {
  32. return power_supply_get_drvdata(psy);
  33. }
  34. static int lt3651_charger_get_property(struct power_supply *psy,
  35. enum power_supply_property psp, union power_supply_propval *val)
  36. {
  37. struct lt3651_charger *lt3651_charger = psy_to_lt3651_charger(psy);
  38. switch (psp) {
  39. case POWER_SUPPLY_PROP_STATUS:
  40. if (!lt3651_charger->chrg_gpio) {
  41. val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  42. break;
  43. }
  44. if (gpiod_get_value(lt3651_charger->chrg_gpio))
  45. val->intval = POWER_SUPPLY_STATUS_CHARGING;
  46. else
  47. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  48. break;
  49. case POWER_SUPPLY_PROP_ONLINE:
  50. val->intval = gpiod_get_value(lt3651_charger->acpr_gpio);
  51. break;
  52. case POWER_SUPPLY_PROP_HEALTH:
  53. if (!lt3651_charger->fault_gpio) {
  54. val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
  55. break;
  56. }
  57. if (!gpiod_get_value(lt3651_charger->fault_gpio)) {
  58. val->intval = POWER_SUPPLY_HEALTH_GOOD;
  59. break;
  60. }
  61. /*
  62. * If the fault pin is active, the chrg pin explains the type
  63. * of failure.
  64. */
  65. if (!lt3651_charger->chrg_gpio) {
  66. val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  67. break;
  68. }
  69. val->intval = gpiod_get_value(lt3651_charger->chrg_gpio) ?
  70. POWER_SUPPLY_HEALTH_OVERHEAT :
  71. POWER_SUPPLY_HEALTH_DEAD;
  72. break;
  73. default:
  74. return -EINVAL;
  75. }
  76. return 0;
  77. }
  78. static enum power_supply_property lt3651_charger_properties[] = {
  79. POWER_SUPPLY_PROP_STATUS,
  80. POWER_SUPPLY_PROP_ONLINE,
  81. POWER_SUPPLY_PROP_HEALTH,
  82. };
  83. static int lt3651_charger_probe(struct platform_device *pdev)
  84. {
  85. struct power_supply_config psy_cfg = {};
  86. struct lt3651_charger *lt3651_charger;
  87. struct power_supply_desc *charger_desc;
  88. int ret;
  89. lt3651_charger = devm_kzalloc(&pdev->dev, sizeof(*lt3651_charger),
  90. GFP_KERNEL);
  91. if (!lt3651_charger)
  92. return -ENOMEM;
  93. lt3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
  94. "lltc,acpr", GPIOD_IN);
  95. if (IS_ERR(lt3651_charger->acpr_gpio)) {
  96. ret = PTR_ERR(lt3651_charger->acpr_gpio);
  97. dev_err(&pdev->dev, "Failed to acquire acpr GPIO: %d\n", ret);
  98. return ret;
  99. }
  100. lt3651_charger->fault_gpio = devm_gpiod_get_optional(&pdev->dev,
  101. "lltc,fault", GPIOD_IN);
  102. if (IS_ERR(lt3651_charger->fault_gpio)) {
  103. ret = PTR_ERR(lt3651_charger->fault_gpio);
  104. dev_err(&pdev->dev, "Failed to acquire fault GPIO: %d\n", ret);
  105. return ret;
  106. }
  107. lt3651_charger->chrg_gpio = devm_gpiod_get_optional(&pdev->dev,
  108. "lltc,chrg", GPIOD_IN);
  109. if (IS_ERR(lt3651_charger->chrg_gpio)) {
  110. ret = PTR_ERR(lt3651_charger->chrg_gpio);
  111. dev_err(&pdev->dev, "Failed to acquire chrg GPIO: %d\n", ret);
  112. return ret;
  113. }
  114. charger_desc = &lt3651_charger->charger_desc;
  115. charger_desc->name = pdev->dev.of_node->name;
  116. charger_desc->type = POWER_SUPPLY_TYPE_MAINS;
  117. charger_desc->properties = lt3651_charger_properties;
  118. charger_desc->num_properties = ARRAY_SIZE(lt3651_charger_properties);
  119. charger_desc->get_property = lt3651_charger_get_property;
  120. psy_cfg.of_node = pdev->dev.of_node;
  121. psy_cfg.drv_data = lt3651_charger;
  122. lt3651_charger->charger = devm_power_supply_register(&pdev->dev,
  123. charger_desc, &psy_cfg);
  124. if (IS_ERR(lt3651_charger->charger)) {
  125. ret = PTR_ERR(lt3651_charger->charger);
  126. dev_err(&pdev->dev, "Failed to register power supply: %d\n",
  127. ret);
  128. return ret;
  129. }
  130. /*
  131. * Acquire IRQs for the GPIO pins if possible. If the system does not
  132. * support IRQs on these pins, userspace will have to poll the sysfs
  133. * files manually.
  134. */
  135. if (lt3651_charger->acpr_gpio) {
  136. ret = gpiod_to_irq(lt3651_charger->acpr_gpio);
  137. if (ret >= 0)
  138. ret = devm_request_any_context_irq(&pdev->dev, ret,
  139. lt3651_charger_irq,
  140. IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  141. dev_name(&pdev->dev), lt3651_charger->charger);
  142. if (ret < 0)
  143. dev_warn(&pdev->dev, "Failed to request acpr irq\n");
  144. }
  145. if (lt3651_charger->fault_gpio) {
  146. ret = gpiod_to_irq(lt3651_charger->fault_gpio);
  147. if (ret >= 0)
  148. ret = devm_request_any_context_irq(&pdev->dev, ret,
  149. lt3651_charger_irq,
  150. IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  151. dev_name(&pdev->dev), lt3651_charger->charger);
  152. if (ret < 0)
  153. dev_warn(&pdev->dev, "Failed to request fault irq\n");
  154. }
  155. if (lt3651_charger->chrg_gpio) {
  156. ret = gpiod_to_irq(lt3651_charger->chrg_gpio);
  157. if (ret >= 0)
  158. ret = devm_request_any_context_irq(&pdev->dev, ret,
  159. lt3651_charger_irq,
  160. IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
  161. dev_name(&pdev->dev), lt3651_charger->charger);
  162. if (ret < 0)
  163. dev_warn(&pdev->dev, "Failed to request chrg irq\n");
  164. }
  165. platform_set_drvdata(pdev, lt3651_charger);
  166. return 0;
  167. }
  168. static const struct of_device_id lt3651_charger_match[] = {
  169. { .compatible = "lltc,ltc3651-charger" }, /* DEPRECATED */
  170. { .compatible = "lltc,lt3651-charger" },
  171. { }
  172. };
  173. MODULE_DEVICE_TABLE(of, lt3651_charger_match);
  174. static struct platform_driver lt3651_charger_driver = {
  175. .probe = lt3651_charger_probe,
  176. .driver = {
  177. .name = "lt3651-charger",
  178. .of_match_table = lt3651_charger_match,
  179. },
  180. };
  181. module_platform_driver(lt3651_charger_driver);
  182. MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
  183. MODULE_DESCRIPTION("Driver for LT3651 charger");
  184. MODULE_LICENSE("GPL");
  185. MODULE_ALIAS("platform:lt3651-charger");