1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Murata ZPA2326 I2C pressure and temperature sensor driver 4 * 5 * Copyright (c) 2016 Parrot S.A. 6 * 7 * Author: Gregor Boirie <gregor.boirie@parrot.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/regmap.h> 12 #include <linux/i2c.h> 13 #include <linux/of_device.h> 14 #include "zpa2326.h" 15 16 /* 17 * read_flag_mask: 18 * - address bit 7 must be set to request a register read operation 19 */ 20 static const struct regmap_config zpa2326_regmap_i2c_config = { 21 .reg_bits = 8, 22 .val_bits = 8, 23 .writeable_reg = zpa2326_isreg_writeable, 24 .readable_reg = zpa2326_isreg_readable, 25 .precious_reg = zpa2326_isreg_precious, 26 .max_register = ZPA2326_TEMP_OUT_H_REG, 27 .read_flag_mask = BIT(7), 28 .cache_type = REGCACHE_NONE, 29 }; 30 31 static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) 32 { 33 #define ZPA2326_SA0(_addr) (_addr & BIT(0)) 34 #define ZPA2326_DEVICE_ID_SA0_SHIFT (1) 35 36 /* Identification register bit 1 mirrors device address bit 0. */ 37 return (ZPA2326_DEVICE_ID | 38 (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); 39 } 40 41 static int zpa2326_probe_i2c(struct i2c_client *client, 42 const struct i2c_device_id *i2c_id) 43 { 44 struct regmap *regmap; 45 46 regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); 47 if (IS_ERR(regmap)) { 48 dev_err(&client->dev, "failed to init registers map"); 49 return PTR_ERR(regmap); 50 } 51 52 return zpa2326_probe(&client->dev, i2c_id->name, client->irq, 53 zpa2326_i2c_hwid(client), regmap); 54 } 55 56 static int zpa2326_remove_i2c(struct i2c_client *client) 57 { 58 zpa2326_remove(&client->dev); 59 60 return 0; 61 } 62 63 static const struct i2c_device_id zpa2326_i2c_ids[] = { 64 { "zpa2326", 0 }, 65 { }, 66 }; 67 MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); 68 69 #if defined(CONFIG_OF) 70 static const struct of_device_id zpa2326_i2c_matches[] = { 71 { .compatible = "murata,zpa2326" }, 72 { } 73 }; 74 MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); 75 #endif 76 77 static struct i2c_driver zpa2326_i2c_driver = { 78 .driver = { 79 .name = "zpa2326-i2c", 80 .of_match_table = of_match_ptr(zpa2326_i2c_matches), 81 .pm = ZPA2326_PM_OPS, 82 }, 83 .probe = zpa2326_probe_i2c, 84 .remove = zpa2326_remove_i2c, 85 .id_table = zpa2326_i2c_ids, 86 }; 87 module_i2c_driver(zpa2326_i2c_driver); 88 89 MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); 90 MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); 91 MODULE_LICENSE("GPL v2"); 92