sprd-sc27xx-spi.c 6.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (C) 2017 Spreadtrum Communications Inc.
  4. */
  5. #include <linux/interrupt.h>
  6. #include <linux/kernel.h>
  7. #include <linux/module.h>
  8. #include <linux/mfd/core.h>
  9. #include <linux/mfd/sc27xx-pmic.h>
  10. #include <linux/of_device.h>
  11. #include <linux/of_platform.h>
  12. #include <linux/regmap.h>
  13. #include <linux/spi/spi.h>
  14. #include <uapi/linux/usb/charger.h>
  15. #define SPRD_PMIC_INT_MASK_STATUS 0x0
  16. #define SPRD_PMIC_INT_RAW_STATUS 0x4
  17. #define SPRD_PMIC_INT_EN 0x8
  18. #define SPRD_SC2731_IRQ_BASE 0x140
  19. #define SPRD_SC2731_IRQ_NUMS 16
  20. #define SPRD_SC2731_CHG_DET 0xedc
  21. /* PMIC charger detection definition */
  22. #define SPRD_PMIC_CHG_DET_DELAY_US 200000
  23. #define SPRD_PMIC_CHG_DET_TIMEOUT 2000000
  24. #define SPRD_PMIC_CHG_DET_DONE BIT(11)
  25. #define SPRD_PMIC_SDP_TYPE BIT(7)
  26. #define SPRD_PMIC_DCP_TYPE BIT(6)
  27. #define SPRD_PMIC_CDP_TYPE BIT(5)
  28. #define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5)
  29. struct sprd_pmic {
  30. struct regmap *regmap;
  31. struct device *dev;
  32. struct regmap_irq *irqs;
  33. struct regmap_irq_chip irq_chip;
  34. struct regmap_irq_chip_data *irq_data;
  35. const struct sprd_pmic_data *pdata;
  36. int irq;
  37. };
  38. struct sprd_pmic_data {
  39. u32 irq_base;
  40. u32 num_irqs;
  41. u32 charger_det;
  42. };
  43. /*
  44. * Since different PMICs of SC27xx series can have different interrupt
  45. * base address and irq number, we should save irq number and irq base
  46. * in the device data structure.
  47. */
  48. static const struct sprd_pmic_data sc2731_data = {
  49. .irq_base = SPRD_SC2731_IRQ_BASE,
  50. .num_irqs = SPRD_SC2731_IRQ_NUMS,
  51. .charger_det = SPRD_SC2731_CHG_DET,
  52. };
  53. enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
  54. {
  55. struct spi_device *spi = to_spi_device(dev);
  56. struct sprd_pmic *ddata = spi_get_drvdata(spi);
  57. const struct sprd_pmic_data *pdata = ddata->pdata;
  58. enum usb_charger_type type;
  59. u32 val;
  60. int ret;
  61. ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
  62. (val & SPRD_PMIC_CHG_DET_DONE),
  63. SPRD_PMIC_CHG_DET_DELAY_US,
  64. SPRD_PMIC_CHG_DET_TIMEOUT);
  65. if (ret) {
  66. dev_err(&spi->dev, "failed to detect charger type\n");
  67. return UNKNOWN_TYPE;
  68. }
  69. switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
  70. case SPRD_PMIC_CDP_TYPE:
  71. type = CDP_TYPE;
  72. break;
  73. case SPRD_PMIC_DCP_TYPE:
  74. type = DCP_TYPE;
  75. break;
  76. case SPRD_PMIC_SDP_TYPE:
  77. type = SDP_TYPE;
  78. break;
  79. default:
  80. type = UNKNOWN_TYPE;
  81. break;
  82. }
  83. return type;
  84. }
  85. EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
  86. static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
  87. {
  88. struct device *dev = context;
  89. struct spi_device *spi = to_spi_device(dev);
  90. return spi_write(spi, data, count);
  91. }
  92. static int sprd_pmic_spi_read(void *context,
  93. const void *reg, size_t reg_size,
  94. void *val, size_t val_size)
  95. {
  96. struct device *dev = context;
  97. struct spi_device *spi = to_spi_device(dev);
  98. u32 rx_buf[2] = { 0 };
  99. int ret;
  100. /* Now we only support one PMIC register to read every time. */
  101. if (reg_size != sizeof(u32) || val_size != sizeof(u32))
  102. return -EINVAL;
  103. /* Copy address to read from into first element of SPI buffer. */
  104. memcpy(rx_buf, reg, sizeof(u32));
  105. ret = spi_read(spi, rx_buf, 1);
  106. if (ret < 0)
  107. return ret;
  108. memcpy(val, rx_buf, val_size);
  109. return 0;
  110. }
  111. static struct regmap_bus sprd_pmic_regmap = {
  112. .write = sprd_pmic_spi_write,
  113. .read = sprd_pmic_spi_read,
  114. .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
  115. .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
  116. };
  117. static const struct regmap_config sprd_pmic_config = {
  118. .reg_bits = 32,
  119. .val_bits = 32,
  120. .reg_stride = 4,
  121. .max_register = 0xffff,
  122. };
  123. static int sprd_pmic_probe(struct spi_device *spi)
  124. {
  125. struct sprd_pmic *ddata;
  126. const struct sprd_pmic_data *pdata;
  127. int ret, i;
  128. pdata = of_device_get_match_data(&spi->dev);
  129. if (!pdata) {
  130. dev_err(&spi->dev, "No matching driver data found\n");
  131. return -EINVAL;
  132. }
  133. ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
  134. if (!ddata)
  135. return -ENOMEM;
  136. ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
  137. &spi->dev, &sprd_pmic_config);
  138. if (IS_ERR(ddata->regmap)) {
  139. ret = PTR_ERR(ddata->regmap);
  140. dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
  141. return ret;
  142. }
  143. spi_set_drvdata(spi, ddata);
  144. ddata->dev = &spi->dev;
  145. ddata->irq = spi->irq;
  146. ddata->pdata = pdata;
  147. ddata->irq_chip.name = dev_name(&spi->dev);
  148. ddata->irq_chip.status_base =
  149. pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
  150. ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
  151. ddata->irq_chip.ack_base = 0;
  152. ddata->irq_chip.num_regs = 1;
  153. ddata->irq_chip.num_irqs = pdata->num_irqs;
  154. ddata->irq_chip.mask_invert = true;
  155. ddata->irqs = devm_kcalloc(&spi->dev,
  156. pdata->num_irqs, sizeof(struct regmap_irq),
  157. GFP_KERNEL);
  158. if (!ddata->irqs)
  159. return -ENOMEM;
  160. ddata->irq_chip.irqs = ddata->irqs;
  161. for (i = 0; i < pdata->num_irqs; i++)
  162. ddata->irqs[i].mask = BIT(i);
  163. ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
  164. IRQF_ONESHOT, 0,
  165. &ddata->irq_chip, &ddata->irq_data);
  166. if (ret) {
  167. dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
  168. return ret;
  169. }
  170. ret = devm_of_platform_populate(&spi->dev);
  171. if (ret) {
  172. dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
  173. return ret;
  174. }
  175. device_init_wakeup(&spi->dev, true);
  176. return 0;
  177. }
  178. #ifdef CONFIG_PM_SLEEP
  179. static int sprd_pmic_suspend(struct device *dev)
  180. {
  181. struct sprd_pmic *ddata = dev_get_drvdata(dev);
  182. if (device_may_wakeup(dev))
  183. enable_irq_wake(ddata->irq);
  184. return 0;
  185. }
  186. static int sprd_pmic_resume(struct device *dev)
  187. {
  188. struct sprd_pmic *ddata = dev_get_drvdata(dev);
  189. if (device_may_wakeup(dev))
  190. disable_irq_wake(ddata->irq);
  191. return 0;
  192. }
  193. #endif
  194. static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
  195. static const struct of_device_id sprd_pmic_match[] = {
  196. { .compatible = "sprd,sc2731", .data = &sc2731_data },
  197. {},
  198. };
  199. MODULE_DEVICE_TABLE(of, sprd_pmic_match);
  200. static struct spi_driver sprd_pmic_driver = {
  201. .driver = {
  202. .name = "sc27xx-pmic",
  203. .of_match_table = sprd_pmic_match,
  204. .pm = &sprd_pmic_pm_ops,
  205. },
  206. .probe = sprd_pmic_probe,
  207. };
  208. static int __init sprd_pmic_init(void)
  209. {
  210. return spi_register_driver(&sprd_pmic_driver);
  211. }
  212. subsys_initcall(sprd_pmic_init);
  213. static void __exit sprd_pmic_exit(void)
  214. {
  215. spi_unregister_driver(&sprd_pmic_driver);
  216. }
  217. module_exit(sprd_pmic_exit);
  218. MODULE_LICENSE("GPL v2");
  219. MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
  220. MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");