tmp103.c 5.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Texas Instruments TMP103 SMBus temperature sensor driver
  4. * Copyright (C) 2014 Heiko Schocher <[email protected]>
  5. *
  6. * Based on:
  7. * Texas Instruments TMP102 SMBus temperature sensor driver
  8. *
  9. * Copyright (C) 2010 Steven King <[email protected]>
  10. */
  11. #include <linux/module.h>
  12. #include <linux/init.h>
  13. #include <linux/slab.h>
  14. #include <linux/i2c.h>
  15. #include <linux/hwmon.h>
  16. #include <linux/hwmon-sysfs.h>
  17. #include <linux/err.h>
  18. #include <linux/mutex.h>
  19. #include <linux/device.h>
  20. #include <linux/jiffies.h>
  21. #include <linux/regmap.h>
  22. #define TMP103_TEMP_REG 0x00
  23. #define TMP103_CONF_REG 0x01
  24. #define TMP103_TLOW_REG 0x02
  25. #define TMP103_THIGH_REG 0x03
  26. #define TMP103_CONF_M0 0x01
  27. #define TMP103_CONF_M1 0x02
  28. #define TMP103_CONF_LC 0x04
  29. #define TMP103_CONF_FL 0x08
  30. #define TMP103_CONF_FH 0x10
  31. #define TMP103_CONF_CR0 0x20
  32. #define TMP103_CONF_CR1 0x40
  33. #define TMP103_CONF_ID 0x80
  34. #define TMP103_CONF_SD (TMP103_CONF_M1)
  35. #define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
  36. #define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
  37. #define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
  38. TMP103_CONF_M0 | TMP103_CONF_M1)
  39. static inline int tmp103_reg_to_mc(s8 val)
  40. {
  41. return val * 1000;
  42. }
  43. static inline u8 tmp103_mc_to_reg(int val)
  44. {
  45. return DIV_ROUND_CLOSEST(val, 1000);
  46. }
  47. static int tmp103_read(struct device *dev, enum hwmon_sensor_types type,
  48. u32 attr, int channel, long *temp)
  49. {
  50. struct regmap *regmap = dev_get_drvdata(dev);
  51. unsigned int regval;
  52. int err, reg;
  53. switch (attr) {
  54. case hwmon_temp_input:
  55. reg = TMP103_TEMP_REG;
  56. break;
  57. case hwmon_temp_min:
  58. reg = TMP103_TLOW_REG;
  59. break;
  60. case hwmon_temp_max:
  61. reg = TMP103_THIGH_REG;
  62. break;
  63. default:
  64. return -EOPNOTSUPP;
  65. }
  66. err = regmap_read(regmap, reg, &regval);
  67. if (err < 0)
  68. return err;
  69. *temp = tmp103_reg_to_mc(regval);
  70. return 0;
  71. }
  72. static int tmp103_write(struct device *dev, enum hwmon_sensor_types type,
  73. u32 attr, int channel, long temp)
  74. {
  75. struct regmap *regmap = dev_get_drvdata(dev);
  76. int reg;
  77. switch (attr) {
  78. case hwmon_temp_min:
  79. reg = TMP103_TLOW_REG;
  80. break;
  81. case hwmon_temp_max:
  82. reg = TMP103_THIGH_REG;
  83. break;
  84. default:
  85. return -EOPNOTSUPP;
  86. }
  87. temp = clamp_val(temp, -55000, 127000);
  88. return regmap_write(regmap, reg, tmp103_mc_to_reg(temp));
  89. }
  90. static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type,
  91. u32 attr, int channel)
  92. {
  93. if (type != hwmon_temp)
  94. return 0;
  95. switch (attr) {
  96. case hwmon_temp_input:
  97. return 0444;
  98. case hwmon_temp_min:
  99. case hwmon_temp_max:
  100. return 0644;
  101. default:
  102. return 0;
  103. }
  104. }
  105. static const struct hwmon_channel_info *tmp103_info[] = {
  106. HWMON_CHANNEL_INFO(chip,
  107. HWMON_C_REGISTER_TZ),
  108. HWMON_CHANNEL_INFO(temp,
  109. HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN),
  110. NULL
  111. };
  112. static const struct hwmon_ops tmp103_hwmon_ops = {
  113. .is_visible = tmp103_is_visible,
  114. .read = tmp103_read,
  115. .write = tmp103_write,
  116. };
  117. static const struct hwmon_chip_info tmp103_chip_info = {
  118. .ops = &tmp103_hwmon_ops,
  119. .info = tmp103_info,
  120. };
  121. static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
  122. {
  123. return reg == TMP103_TEMP_REG;
  124. }
  125. static const struct regmap_config tmp103_regmap_config = {
  126. .reg_bits = 8,
  127. .val_bits = 8,
  128. .max_register = TMP103_THIGH_REG,
  129. .volatile_reg = tmp103_regmap_is_volatile,
  130. };
  131. static int tmp103_probe(struct i2c_client *client)
  132. {
  133. struct device *dev = &client->dev;
  134. struct device *hwmon_dev;
  135. struct regmap *regmap;
  136. int ret;
  137. regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
  138. if (IS_ERR(regmap)) {
  139. dev_err(dev, "failed to allocate register map\n");
  140. return PTR_ERR(regmap);
  141. }
  142. ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
  143. TMP103_CONFIG);
  144. if (ret < 0) {
  145. dev_err(&client->dev, "error writing config register\n");
  146. return ret;
  147. }
  148. i2c_set_clientdata(client, regmap);
  149. hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
  150. regmap,
  151. &tmp103_chip_info,
  152. NULL);
  153. return PTR_ERR_OR_ZERO(hwmon_dev);
  154. }
  155. static int tmp103_suspend(struct device *dev)
  156. {
  157. struct regmap *regmap = dev_get_drvdata(dev);
  158. return regmap_update_bits(regmap, TMP103_CONF_REG,
  159. TMP103_CONF_SD_MASK, 0);
  160. }
  161. static int tmp103_resume(struct device *dev)
  162. {
  163. struct regmap *regmap = dev_get_drvdata(dev);
  164. return regmap_update_bits(regmap, TMP103_CONF_REG,
  165. TMP103_CONF_SD_MASK, TMP103_CONF_SD);
  166. }
  167. static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume);
  168. static const struct i2c_device_id tmp103_id[] = {
  169. { "tmp103", 0 },
  170. { }
  171. };
  172. MODULE_DEVICE_TABLE(i2c, tmp103_id);
  173. static const struct of_device_id __maybe_unused tmp103_of_match[] = {
  174. { .compatible = "ti,tmp103" },
  175. { },
  176. };
  177. MODULE_DEVICE_TABLE(of, tmp103_of_match);
  178. static struct i2c_driver tmp103_driver = {
  179. .driver = {
  180. .name = "tmp103",
  181. .of_match_table = of_match_ptr(tmp103_of_match),
  182. .pm = pm_sleep_ptr(&tmp103_dev_pm_ops),
  183. },
  184. .probe_new = tmp103_probe,
  185. .id_table = tmp103_id,
  186. };
  187. module_i2c_driver(tmp103_driver);
  188. MODULE_AUTHOR("Heiko Schocher <[email protected]>");
  189. MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
  190. MODULE_LICENSE("GPL");