dptf_power.c 6.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * dptf_power: DPTF platform power driver
  4. * Copyright (c) 2016, Intel Corporation.
  5. */
  6. #include <linux/kernel.h>
  7. #include <linux/module.h>
  8. #include <linux/acpi.h>
  9. #include <linux/platform_device.h>
  10. /*
  11. * Presentation of attributes which are defined for INT3407 and INT3532.
  12. * They are:
  13. * PMAX : Maximum platform power
  14. * PSRC : Platform power source
  15. * ARTG : Adapter rating
  16. * CTYP : Charger type
  17. * PROP : Rest of worst case platform Power
  18. * PBSS : Power Battery Steady State
  19. * RBHF : High Frequency Impedance
  20. * VBNL : Instantaneous No-Load Voltage
  21. * CMPP : Current Discharge Capability
  22. */
  23. #define DPTF_POWER_SHOW(name, object) \
  24. static ssize_t name##_show(struct device *dev,\
  25. struct device_attribute *attr,\
  26. char *buf)\
  27. {\
  28. struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
  29. unsigned long long val;\
  30. acpi_status status;\
  31. \
  32. status = acpi_evaluate_integer(acpi_dev->handle, #object,\
  33. NULL, &val);\
  34. if (ACPI_SUCCESS(status))\
  35. return sprintf(buf, "%d\n", (int)val);\
  36. else \
  37. return -EINVAL;\
  38. }
  39. DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
  40. DPTF_POWER_SHOW(platform_power_source, PSRC)
  41. DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
  42. DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
  43. DPTF_POWER_SHOW(charger_type, CTYP)
  44. DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
  45. DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
  46. DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
  47. DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
  48. DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);
  49. static DEVICE_ATTR_RO(max_platform_power_mw);
  50. static DEVICE_ATTR_RO(platform_power_source);
  51. static DEVICE_ATTR_RO(adapter_rating_mw);
  52. static DEVICE_ATTR_RO(battery_steady_power_mw);
  53. static DEVICE_ATTR_RO(charger_type);
  54. static DEVICE_ATTR_RO(rest_of_platform_power_mw);
  55. static DEVICE_ATTR_RO(max_steady_state_power_mw);
  56. static DEVICE_ATTR_RO(high_freq_impedance_mohm);
  57. static DEVICE_ATTR_RO(no_load_voltage_mv);
  58. static DEVICE_ATTR_RO(current_discharge_capbility_ma);
  59. static ssize_t prochot_confirm_store(struct device *dev,
  60. struct device_attribute *attr,
  61. const char *buf, size_t count)
  62. {
  63. struct acpi_device *acpi_dev = dev_get_drvdata(dev);
  64. acpi_status status;
  65. int seq_no;
  66. if (kstrtouint(buf, 0, &seq_no) < 0)
  67. return -EINVAL;
  68. status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
  69. if (ACPI_SUCCESS(status))
  70. return count;
  71. return -EINVAL;
  72. }
  73. static DEVICE_ATTR_WO(prochot_confirm);
  74. static struct attribute *dptf_power_attrs[] = {
  75. &dev_attr_max_platform_power_mw.attr,
  76. &dev_attr_platform_power_source.attr,
  77. &dev_attr_adapter_rating_mw.attr,
  78. &dev_attr_battery_steady_power_mw.attr,
  79. &dev_attr_charger_type.attr,
  80. &dev_attr_rest_of_platform_power_mw.attr,
  81. &dev_attr_prochot_confirm.attr,
  82. NULL
  83. };
  84. static const struct attribute_group dptf_power_attribute_group = {
  85. .attrs = dptf_power_attrs,
  86. .name = "dptf_power"
  87. };
  88. static struct attribute *dptf_battery_attrs[] = {
  89. &dev_attr_max_platform_power_mw.attr,
  90. &dev_attr_max_steady_state_power_mw.attr,
  91. &dev_attr_high_freq_impedance_mohm.attr,
  92. &dev_attr_no_load_voltage_mv.attr,
  93. &dev_attr_current_discharge_capbility_ma.attr,
  94. NULL
  95. };
  96. static const struct attribute_group dptf_battery_attribute_group = {
  97. .attrs = dptf_battery_attrs,
  98. .name = "dptf_battery"
  99. };
  100. #define MAX_POWER_CHANGED 0x80
  101. #define POWER_STATE_CHANGED 0x81
  102. #define STEADY_STATE_POWER_CHANGED 0x83
  103. #define POWER_PROP_CHANGE_EVENT 0x84
  104. #define IMPEDANCE_CHANGED 0x85
  105. #define VOLTAGE_CURRENT_CHANGED 0x86
  106. static long long dptf_participant_type(acpi_handle handle)
  107. {
  108. unsigned long long ptype;
  109. acpi_status status;
  110. status = acpi_evaluate_integer(handle, "PTYP", NULL, &ptype);
  111. if (ACPI_FAILURE(status))
  112. return -ENODEV;
  113. return ptype;
  114. }
  115. static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
  116. {
  117. struct platform_device *pdev = data;
  118. char *attr;
  119. switch (event) {
  120. case POWER_STATE_CHANGED:
  121. attr = "platform_power_source";
  122. break;
  123. case POWER_PROP_CHANGE_EVENT:
  124. attr = "rest_of_platform_power_mw";
  125. break;
  126. case MAX_POWER_CHANGED:
  127. attr = "max_platform_power_mw";
  128. break;
  129. case STEADY_STATE_POWER_CHANGED:
  130. attr = "max_steady_state_power_mw";
  131. break;
  132. case IMPEDANCE_CHANGED:
  133. attr = "high_freq_impedance_mohm";
  134. break;
  135. case VOLTAGE_CURRENT_CHANGED:
  136. attr = "no_load_voltage_mv";
  137. break;
  138. default:
  139. dev_err(&pdev->dev, "Unsupported event [0x%x]\n", event);
  140. return;
  141. }
  142. /*
  143. * Notify that an attribute is changed, so that user space can read
  144. * again.
  145. */
  146. if (dptf_participant_type(handle) == 0x0CULL)
  147. sysfs_notify(&pdev->dev.kobj, "dptf_battery", attr);
  148. else
  149. sysfs_notify(&pdev->dev.kobj, "dptf_power", attr);
  150. }
  151. static int dptf_power_add(struct platform_device *pdev)
  152. {
  153. const struct attribute_group *attr_group;
  154. struct acpi_device *acpi_dev;
  155. unsigned long long ptype;
  156. int result;
  157. acpi_dev = ACPI_COMPANION(&(pdev->dev));
  158. if (!acpi_dev)
  159. return -ENODEV;
  160. ptype = dptf_participant_type(acpi_dev->handle);
  161. if (ptype == 0x11)
  162. attr_group = &dptf_power_attribute_group;
  163. else if (ptype == 0x0C)
  164. attr_group = &dptf_battery_attribute_group;
  165. else
  166. return -ENODEV;
  167. result = acpi_install_notify_handler(acpi_dev->handle,
  168. ACPI_DEVICE_NOTIFY,
  169. dptf_power_notify,
  170. (void *)pdev);
  171. if (result)
  172. return result;
  173. result = sysfs_create_group(&pdev->dev.kobj,
  174. attr_group);
  175. if (result) {
  176. acpi_remove_notify_handler(acpi_dev->handle,
  177. ACPI_DEVICE_NOTIFY,
  178. dptf_power_notify);
  179. return result;
  180. }
  181. platform_set_drvdata(pdev, acpi_dev);
  182. return 0;
  183. }
  184. static int dptf_power_remove(struct platform_device *pdev)
  185. {
  186. struct acpi_device *acpi_dev = platform_get_drvdata(pdev);
  187. acpi_remove_notify_handler(acpi_dev->handle,
  188. ACPI_DEVICE_NOTIFY,
  189. dptf_power_notify);
  190. if (dptf_participant_type(acpi_dev->handle) == 0x0CULL)
  191. sysfs_remove_group(&pdev->dev.kobj, &dptf_battery_attribute_group);
  192. else
  193. sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
  194. return 0;
  195. }
  196. static const struct acpi_device_id int3407_device_ids[] = {
  197. {"INT3407", 0},
  198. {"INT3532", 0},
  199. {"INTC1047", 0},
  200. {"INTC1050", 0},
  201. {"INTC1060", 0},
  202. {"INTC1061", 0},
  203. {"INTC1065", 0},
  204. {"INTC1066", 0},
  205. {"INTC10A4", 0},
  206. {"INTC10A5", 0},
  207. {"", 0},
  208. };
  209. MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
  210. static struct platform_driver dptf_power_driver = {
  211. .probe = dptf_power_add,
  212. .remove = dptf_power_remove,
  213. .driver = {
  214. .name = "dptf_power",
  215. .acpi_match_table = int3407_device_ids,
  216. },
  217. };
  218. module_platform_driver(dptf_power_driver);
  219. MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
  220. MODULE_LICENSE("GPL v2");
  221. MODULE_DESCRIPTION("ACPI DPTF platform power driver");