goldfish_battery.c 7.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Power supply driver for the goldfish emulator
  4. *
  5. * Copyright (C) 2008 Google, Inc.
  6. * Copyright (C) 2012 Intel, Inc.
  7. * Copyright (C) 2013 Intel, Inc.
  8. * Author: Mike Lockwood <lockwood@android.com>
  9. */
  10. #include <linux/module.h>
  11. #include <linux/err.h>
  12. #include <linux/platform_device.h>
  13. #include <linux/power_supply.h>
  14. #include <linux/types.h>
  15. #include <linux/pci.h>
  16. #include <linux/interrupt.h>
  17. #include <linux/io.h>
  18. #include <linux/acpi.h>
  19. struct goldfish_battery_data {
  20. void __iomem *reg_base;
  21. int irq;
  22. spinlock_t lock;
  23. struct power_supply *battery;
  24. struct power_supply *ac;
  25. };
  26. #define GOLDFISH_BATTERY_READ(data, addr) \
  27. (readl(data->reg_base + addr))
  28. #define GOLDFISH_BATTERY_WRITE(data, addr, x) \
  29. (writel(x, data->reg_base + addr))
  30. enum {
  31. /* status register */
  32. BATTERY_INT_STATUS = 0x00,
  33. /* set this to enable IRQ */
  34. BATTERY_INT_ENABLE = 0x04,
  35. BATTERY_AC_ONLINE = 0x08,
  36. BATTERY_STATUS = 0x0C,
  37. BATTERY_HEALTH = 0x10,
  38. BATTERY_PRESENT = 0x14,
  39. BATTERY_CAPACITY = 0x18,
  40. BATTERY_VOLTAGE = 0x1C,
  41. BATTERY_TEMP = 0x20,
  42. BATTERY_CHARGE_COUNTER = 0x24,
  43. BATTERY_VOLTAGE_MAX = 0x28,
  44. BATTERY_CURRENT_MAX = 0x2C,
  45. BATTERY_CURRENT_NOW = 0x30,
  46. BATTERY_CURRENT_AVG = 0x34,
  47. BATTERY_CHARGE_FULL_UAH = 0x38,
  48. BATTERY_CYCLE_COUNT = 0x40,
  49. BATTERY_STATUS_CHANGED = 1U << 0,
  50. AC_STATUS_CHANGED = 1U << 1,
  51. BATTERY_INT_MASK = BATTERY_STATUS_CHANGED | AC_STATUS_CHANGED,
  52. };
  53. static int goldfish_ac_get_property(struct power_supply *psy,
  54. enum power_supply_property psp,
  55. union power_supply_propval *val)
  56. {
  57. struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
  58. int ret = 0;
  59. switch (psp) {
  60. case POWER_SUPPLY_PROP_ONLINE:
  61. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_AC_ONLINE);
  62. break;
  63. case POWER_SUPPLY_PROP_VOLTAGE_MAX:
  64. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE_MAX);
  65. break;
  66. case POWER_SUPPLY_PROP_CURRENT_MAX:
  67. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_MAX);
  68. break;
  69. default:
  70. ret = -EINVAL;
  71. break;
  72. }
  73. return ret;
  74. }
  75. static int goldfish_battery_get_property(struct power_supply *psy,
  76. enum power_supply_property psp,
  77. union power_supply_propval *val)
  78. {
  79. struct goldfish_battery_data *data = power_supply_get_drvdata(psy);
  80. int ret = 0;
  81. switch (psp) {
  82. case POWER_SUPPLY_PROP_STATUS:
  83. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_STATUS);
  84. break;
  85. case POWER_SUPPLY_PROP_HEALTH:
  86. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_HEALTH);
  87. break;
  88. case POWER_SUPPLY_PROP_PRESENT:
  89. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_PRESENT);
  90. break;
  91. case POWER_SUPPLY_PROP_TECHNOLOGY:
  92. val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
  93. break;
  94. case POWER_SUPPLY_PROP_CAPACITY:
  95. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CAPACITY);
  96. break;
  97. case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  98. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_VOLTAGE);
  99. break;
  100. case POWER_SUPPLY_PROP_TEMP:
  101. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_TEMP);
  102. break;
  103. case POWER_SUPPLY_PROP_CHARGE_COUNTER:
  104. val->intval = GOLDFISH_BATTERY_READ(data,
  105. BATTERY_CHARGE_COUNTER);
  106. break;
  107. case POWER_SUPPLY_PROP_CURRENT_NOW:
  108. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_NOW);
  109. break;
  110. case POWER_SUPPLY_PROP_CURRENT_AVG:
  111. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CURRENT_AVG);
  112. break;
  113. case POWER_SUPPLY_PROP_CHARGE_FULL:
  114. val->intval = GOLDFISH_BATTERY_READ(data,
  115. BATTERY_CHARGE_FULL_UAH);
  116. break;
  117. case POWER_SUPPLY_PROP_CYCLE_COUNT:
  118. val->intval = GOLDFISH_BATTERY_READ(data, BATTERY_CYCLE_COUNT);
  119. break;
  120. default:
  121. ret = -EINVAL;
  122. break;
  123. }
  124. return ret;
  125. }
  126. static enum power_supply_property goldfish_battery_props[] = {
  127. POWER_SUPPLY_PROP_STATUS,
  128. POWER_SUPPLY_PROP_HEALTH,
  129. POWER_SUPPLY_PROP_PRESENT,
  130. POWER_SUPPLY_PROP_TECHNOLOGY,
  131. POWER_SUPPLY_PROP_CAPACITY,
  132. POWER_SUPPLY_PROP_VOLTAGE_NOW,
  133. POWER_SUPPLY_PROP_TEMP,
  134. POWER_SUPPLY_PROP_CHARGE_COUNTER,
  135. POWER_SUPPLY_PROP_CURRENT_NOW,
  136. POWER_SUPPLY_PROP_CURRENT_AVG,
  137. POWER_SUPPLY_PROP_CHARGE_FULL,
  138. POWER_SUPPLY_PROP_CYCLE_COUNT,
  139. };
  140. static enum power_supply_property goldfish_ac_props[] = {
  141. POWER_SUPPLY_PROP_ONLINE,
  142. POWER_SUPPLY_PROP_VOLTAGE_MAX,
  143. POWER_SUPPLY_PROP_CURRENT_MAX,
  144. };
  145. static irqreturn_t goldfish_battery_interrupt(int irq, void *dev_id)
  146. {
  147. unsigned long irq_flags;
  148. struct goldfish_battery_data *data = dev_id;
  149. uint32_t status;
  150. spin_lock_irqsave(&data->lock, irq_flags);
  151. /* read status flags, which will clear the interrupt */
  152. status = GOLDFISH_BATTERY_READ(data, BATTERY_INT_STATUS);
  153. status &= BATTERY_INT_MASK;
  154. if (status & BATTERY_STATUS_CHANGED)
  155. power_supply_changed(data->battery);
  156. if (status & AC_STATUS_CHANGED)
  157. power_supply_changed(data->ac);
  158. spin_unlock_irqrestore(&data->lock, irq_flags);
  159. return status ? IRQ_HANDLED : IRQ_NONE;
  160. }
  161. static const struct power_supply_desc battery_desc = {
  162. .properties = goldfish_battery_props,
  163. .num_properties = ARRAY_SIZE(goldfish_battery_props),
  164. .get_property = goldfish_battery_get_property,
  165. .name = "battery",
  166. .type = POWER_SUPPLY_TYPE_BATTERY,
  167. };
  168. static const struct power_supply_desc ac_desc = {
  169. .properties = goldfish_ac_props,
  170. .num_properties = ARRAY_SIZE(goldfish_ac_props),
  171. .get_property = goldfish_ac_get_property,
  172. .name = "ac",
  173. .type = POWER_SUPPLY_TYPE_MAINS,
  174. };
  175. static int goldfish_battery_probe(struct platform_device *pdev)
  176. {
  177. int ret;
  178. struct resource *r;
  179. struct goldfish_battery_data *data;
  180. struct power_supply_config psy_cfg = {};
  181. data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  182. if (data == NULL)
  183. return -ENOMEM;
  184. spin_lock_init(&data->lock);
  185. r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  186. if (r == NULL) {
  187. dev_err(&pdev->dev, "platform_get_resource failed\n");
  188. return -ENODEV;
  189. }
  190. data->reg_base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
  191. if (data->reg_base == NULL) {
  192. dev_err(&pdev->dev, "unable to remap MMIO\n");
  193. return -ENOMEM;
  194. }
  195. data->irq = platform_get_irq(pdev, 0);
  196. if (data->irq < 0) {
  197. dev_err(&pdev->dev, "platform_get_irq failed\n");
  198. return -ENODEV;
  199. }
  200. ret = devm_request_irq(&pdev->dev, data->irq,
  201. goldfish_battery_interrupt,
  202. IRQF_SHARED, pdev->name, data);
  203. if (ret)
  204. return ret;
  205. psy_cfg.drv_data = data;
  206. data->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
  207. if (IS_ERR(data->ac))
  208. return PTR_ERR(data->ac);
  209. data->battery = power_supply_register(&pdev->dev, &battery_desc,
  210. &psy_cfg);
  211. if (IS_ERR(data->battery)) {
  212. power_supply_unregister(data->ac);
  213. return PTR_ERR(data->battery);
  214. }
  215. platform_set_drvdata(pdev, data);
  216. GOLDFISH_BATTERY_WRITE(data, BATTERY_INT_ENABLE, BATTERY_INT_MASK);
  217. return 0;
  218. }
  219. static int goldfish_battery_remove(struct platform_device *pdev)
  220. {
  221. struct goldfish_battery_data *data = platform_get_drvdata(pdev);
  222. power_supply_unregister(data->battery);
  223. power_supply_unregister(data->ac);
  224. return 0;
  225. }
  226. static const struct of_device_id goldfish_battery_of_match[] = {
  227. { .compatible = "google,goldfish-battery", },
  228. {},
  229. };
  230. MODULE_DEVICE_TABLE(of, goldfish_battery_of_match);
  231. #ifdef CONFIG_ACPI
  232. static const struct acpi_device_id goldfish_battery_acpi_match[] = {
  233. { "GFSH0001", 0 },
  234. { },
  235. };
  236. MODULE_DEVICE_TABLE(acpi, goldfish_battery_acpi_match);
  237. #endif
  238. static struct platform_driver goldfish_battery_device = {
  239. .probe = goldfish_battery_probe,
  240. .remove = goldfish_battery_remove,
  241. .driver = {
  242. .name = "goldfish-battery",
  243. .of_match_table = goldfish_battery_of_match,
  244. .acpi_match_table = ACPI_PTR(goldfish_battery_acpi_match),
  245. }
  246. };
  247. module_platform_driver(goldfish_battery_device);
  248. MODULE_AUTHOR("Mike Lockwood lockwood@android.com");
  249. MODULE_LICENSE("GPL");
  250. MODULE_DESCRIPTION("Battery driver for the Goldfish emulator");