pcf50633-core.c 7.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /* NXP PCF50633 Power Management Unit (PMU) driver
  3. *
  4. * (C) 2006-2008 by Openmoko, Inc.
  5. * Author: Harald Welte <laforge@openmoko.org>
  6. * Balaji Rao <balajirrao@openmoko.org>
  7. * All rights reserved.
  8. */
  9. #include <linux/kernel.h>
  10. #include <linux/device.h>
  11. #include <linux/sysfs.h>
  12. #include <linux/module.h>
  13. #include <linux/types.h>
  14. #include <linux/interrupt.h>
  15. #include <linux/workqueue.h>
  16. #include <linux/platform_device.h>
  17. #include <linux/i2c.h>
  18. #include <linux/pm.h>
  19. #include <linux/slab.h>
  20. #include <linux/regmap.h>
  21. #include <linux/err.h>
  22. #include <linux/mfd/pcf50633/core.h>
  23. /* Read a block of up to 32 regs */
  24. int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
  25. int nr_regs, u8 *data)
  26. {
  27. int ret;
  28. ret = regmap_raw_read(pcf->regmap, reg, data, nr_regs);
  29. if (ret != 0)
  30. return ret;
  31. return nr_regs;
  32. }
  33. EXPORT_SYMBOL_GPL(pcf50633_read_block);
  34. /* Write a block of up to 32 regs */
  35. int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
  36. int nr_regs, u8 *data)
  37. {
  38. return regmap_raw_write(pcf->regmap, reg, data, nr_regs);
  39. }
  40. EXPORT_SYMBOL_GPL(pcf50633_write_block);
  41. u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
  42. {
  43. unsigned int val;
  44. int ret;
  45. ret = regmap_read(pcf->regmap, reg, &val);
  46. if (ret < 0)
  47. return -1;
  48. return val;
  49. }
  50. EXPORT_SYMBOL_GPL(pcf50633_reg_read);
  51. int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
  52. {
  53. return regmap_write(pcf->regmap, reg, val);
  54. }
  55. EXPORT_SYMBOL_GPL(pcf50633_reg_write);
  56. int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
  57. {
  58. return regmap_update_bits(pcf->regmap, reg, mask, val);
  59. }
  60. EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
  61. int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
  62. {
  63. return regmap_update_bits(pcf->regmap, reg, val, 0);
  64. }
  65. EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);
  66. /* sysfs attributes */
  67. static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
  68. char *buf)
  69. {
  70. struct pcf50633 *pcf = dev_get_drvdata(dev);
  71. u8 dump[16];
  72. int n, n1, idx = 0;
  73. char *buf1 = buf;
  74. static u8 address_no_read[] = { /* must be ascending */
  75. PCF50633_REG_INT1,
  76. PCF50633_REG_INT2,
  77. PCF50633_REG_INT3,
  78. PCF50633_REG_INT4,
  79. PCF50633_REG_INT5,
  80. 0 /* terminator */
  81. };
  82. for (n = 0; n < 256; n += sizeof(dump)) {
  83. for (n1 = 0; n1 < sizeof(dump); n1++)
  84. if (n == address_no_read[idx]) {
  85. idx++;
  86. dump[n1] = 0x00;
  87. } else
  88. dump[n1] = pcf50633_reg_read(pcf, n + n1);
  89. buf1 += sprintf(buf1, "%*ph\n", (int)sizeof(dump), dump);
  90. }
  91. return buf1 - buf;
  92. }
  93. static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);
  94. static ssize_t show_resume_reason(struct device *dev,
  95. struct device_attribute *attr, char *buf)
  96. {
  97. struct pcf50633 *pcf = dev_get_drvdata(dev);
  98. int n;
  99. n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
  100. pcf->resume_reason[0],
  101. pcf->resume_reason[1],
  102. pcf->resume_reason[2],
  103. pcf->resume_reason[3],
  104. pcf->resume_reason[4]);
  105. return n;
  106. }
  107. static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);
  108. static struct attribute *pcf_sysfs_entries[] = {
  109. &dev_attr_dump_regs.attr,
  110. &dev_attr_resume_reason.attr,
  111. NULL,
  112. };
  113. static struct attribute_group pcf_attr_group = {
  114. .name = NULL, /* put in device directory */
  115. .attrs = pcf_sysfs_entries,
  116. };
  117. static void
  118. pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
  119. struct platform_device **pdev)
  120. {
  121. int ret;
  122. *pdev = platform_device_alloc(name, -1);
  123. if (!*pdev) {
  124. dev_err(pcf->dev, "Failed to allocate %s\n", name);
  125. return;
  126. }
  127. (*pdev)->dev.parent = pcf->dev;
  128. ret = platform_device_add(*pdev);
  129. if (ret) {
  130. dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
  131. platform_device_put(*pdev);
  132. *pdev = NULL;
  133. }
  134. }
  135. #ifdef CONFIG_PM_SLEEP
  136. static int pcf50633_suspend(struct device *dev)
  137. {
  138. struct i2c_client *client = to_i2c_client(dev);
  139. struct pcf50633 *pcf = i2c_get_clientdata(client);
  140. return pcf50633_irq_suspend(pcf);
  141. }
  142. static int pcf50633_resume(struct device *dev)
  143. {
  144. struct i2c_client *client = to_i2c_client(dev);
  145. struct pcf50633 *pcf = i2c_get_clientdata(client);
  146. return pcf50633_irq_resume(pcf);
  147. }
  148. #endif
  149. static SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
  150. static const struct regmap_config pcf50633_regmap_config = {
  151. .reg_bits = 8,
  152. .val_bits = 8,
  153. };
  154. static int pcf50633_probe(struct i2c_client *client,
  155. const struct i2c_device_id *ids)
  156. {
  157. struct pcf50633 *pcf;
  158. struct platform_device *pdev;
  159. struct pcf50633_platform_data *pdata = dev_get_platdata(&client->dev);
  160. int i, j, ret;
  161. int version, variant;
  162. if (!client->irq) {
  163. dev_err(&client->dev, "Missing IRQ\n");
  164. return -ENOENT;
  165. }
  166. pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
  167. if (!pcf)
  168. return -ENOMEM;
  169. i2c_set_clientdata(client, pcf);
  170. pcf->dev = &client->dev;
  171. pcf->pdata = pdata;
  172. mutex_init(&pcf->lock);
  173. pcf->regmap = devm_regmap_init_i2c(client, &pcf50633_regmap_config);
  174. if (IS_ERR(pcf->regmap)) {
  175. ret = PTR_ERR(pcf->regmap);
  176. dev_err(pcf->dev, "Failed to allocate register map: %d\n", ret);
  177. return ret;
  178. }
  179. version = pcf50633_reg_read(pcf, 0);
  180. variant = pcf50633_reg_read(pcf, 1);
  181. if (version < 0 || variant < 0) {
  182. dev_err(pcf->dev, "Unable to probe pcf50633\n");
  183. ret = -ENODEV;
  184. return ret;
  185. }
  186. dev_info(pcf->dev, "Probed device version %d variant %d\n",
  187. version, variant);
  188. pcf50633_irq_init(pcf, client->irq);
  189. /* Create sub devices */
  190. pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
  191. pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
  192. pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
  193. pcf50633_client_dev_register(pcf, "pcf50633-adc", &pcf->adc_pdev);
  194. pcf50633_client_dev_register(pcf, "pcf50633-backlight", &pcf->bl_pdev);
  195. for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
  196. pdev = platform_device_alloc("pcf50633-regulator", i);
  197. if (!pdev) {
  198. ret = -ENOMEM;
  199. goto err2;
  200. }
  201. pdev->dev.parent = pcf->dev;
  202. ret = platform_device_add_data(pdev, &pdata->reg_init_data[i],
  203. sizeof(pdata->reg_init_data[i]));
  204. if (ret)
  205. goto err;
  206. ret = platform_device_add(pdev);
  207. if (ret)
  208. goto err;
  209. pcf->regulator_pdev[i] = pdev;
  210. }
  211. ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
  212. if (ret)
  213. dev_warn(pcf->dev, "error creating sysfs entries\n");
  214. if (pdata->probe_done)
  215. pdata->probe_done(pcf);
  216. return 0;
  217. err:
  218. platform_device_put(pdev);
  219. err2:
  220. for (j = 0; j < i; j++)
  221. platform_device_put(pcf->regulator_pdev[j]);
  222. return ret;
  223. }
  224. static int pcf50633_remove(struct i2c_client *client)
  225. {
  226. struct pcf50633 *pcf = i2c_get_clientdata(client);
  227. int i;
  228. sysfs_remove_group(&client->dev.kobj, &pcf_attr_group);
  229. pcf50633_irq_free(pcf);
  230. platform_device_unregister(pcf->input_pdev);
  231. platform_device_unregister(pcf->rtc_pdev);
  232. platform_device_unregister(pcf->mbc_pdev);
  233. platform_device_unregister(pcf->adc_pdev);
  234. platform_device_unregister(pcf->bl_pdev);
  235. for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
  236. platform_device_unregister(pcf->regulator_pdev[i]);
  237. return 0;
  238. }
  239. static const struct i2c_device_id pcf50633_id_table[] = {
  240. {"pcf50633", 0x73},
  241. {/* end of list */}
  242. };
  243. MODULE_DEVICE_TABLE(i2c, pcf50633_id_table);
  244. static struct i2c_driver pcf50633_driver = {
  245. .driver = {
  246. .name = "pcf50633",
  247. .pm = &pcf50633_pm,
  248. },
  249. .id_table = pcf50633_id_table,
  250. .probe = pcf50633_probe,
  251. .remove = pcf50633_remove,
  252. };
  253. static int __init pcf50633_init(void)
  254. {
  255. return i2c_add_driver(&pcf50633_driver);
  256. }
  257. static void __exit pcf50633_exit(void)
  258. {
  259. i2c_del_driver(&pcf50633_driver);
  260. }
  261. MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
  262. MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
  263. MODULE_LICENSE("GPL");
  264. subsys_initcall(pcf50633_init);
  265. module_exit(pcf50633_exit);