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/mod_devicetable.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 }; 29 30 static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) 31 { 32 #define ZPA2326_SA0(_addr) (_addr & BIT(0)) 33 #define ZPA2326_DEVICE_ID_SA0_SHIFT (1) 34 35 /* Identification register bit 1 mirrors device address bit 0. */ 36 return (ZPA2326_DEVICE_ID | 37 (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); 38 } 39 40 static int zpa2326_probe_i2c(struct i2c_client *client) 41 { 42 const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client); 43 struct regmap *regmap; 44 45 regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); 46 if (IS_ERR(regmap)) { 47 dev_err(&client->dev, "failed to init registers map"); 48 return PTR_ERR(regmap); 49 } 50 51 return zpa2326_probe(&client->dev, i2c_id->name, client->irq, 52 zpa2326_i2c_hwid(client), regmap); 53 } 54 55 static void zpa2326_remove_i2c(struct i2c_client *client) 56 { 57 zpa2326_remove(&client->dev); 58 } 59 60 static const struct i2c_device_id zpa2326_i2c_ids[] = { 61 { "zpa2326" }, 62 { } 63 }; 64 MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); 65 66 static const struct of_device_id zpa2326_i2c_matches[] = { 67 { .compatible = "murata,zpa2326" }, 68 { } 69 }; 70 MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); 71 72 static struct i2c_driver zpa2326_i2c_driver = { 73 .driver = { 74 .name = "zpa2326-i2c", 75 .of_match_table = zpa2326_i2c_matches, 76 .pm = ZPA2326_PM_OPS, 77 }, 78 .probe = zpa2326_probe_i2c, 79 .remove = zpa2326_remove_i2c, 80 .id_table = zpa2326_i2c_ids, 81 }; 82 module_i2c_driver(zpa2326_i2c_driver); 83 84 MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); 85 MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); 86 MODULE_LICENSE("GPL v2"); 87 MODULE_IMPORT_NS("IIO_ZPA2326"); 88