| Gregor Boirie | 03b262f | 2016-09-13 14:23:14 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Murata ZPA2326 I2C pressure and temperature sensor driver |
| 3 | * |
| 4 | * Copyright (c) 2016 Parrot S.A. |
| 5 | * |
| 6 | * Author: Gregor Boirie <gregor.boirie@parrot.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published by |
| 10 | * the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/regmap.h> |
| 20 | #include <linux/i2c.h> |
| 21 | #include <linux/of_device.h> |
| 22 | #include "zpa2326.h" |
| 23 | |
| 24 | /* |
| 25 | * read_flag_mask: |
| 26 | * - address bit 7 must be set to request a register read operation |
| 27 | */ |
| 28 | static const struct regmap_config zpa2326_regmap_i2c_config = { |
| 29 | .reg_bits = 8, |
| 30 | .val_bits = 8, |
| 31 | .writeable_reg = zpa2326_isreg_writeable, |
| 32 | .readable_reg = zpa2326_isreg_readable, |
| 33 | .precious_reg = zpa2326_isreg_precious, |
| 34 | .max_register = ZPA2326_TEMP_OUT_H_REG, |
| 35 | .read_flag_mask = BIT(7), |
| 36 | .cache_type = REGCACHE_NONE, |
| 37 | }; |
| 38 | |
| 39 | static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) |
| 40 | { |
| 41 | #define ZPA2326_SA0(_addr) (_addr & BIT(0)) |
| 42 | #define ZPA2326_DEVICE_ID_SA0_SHIFT (1) |
| 43 | |
| 44 | /* Identification register bit 1 mirrors device address bit 0. */ |
| 45 | return (ZPA2326_DEVICE_ID | |
| 46 | (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); |
| 47 | } |
| 48 | |
| 49 | static int zpa2326_probe_i2c(struct i2c_client *client, |
| 50 | const struct i2c_device_id *i2c_id) |
| 51 | { |
| 52 | struct regmap *regmap; |
| 53 | |
| 54 | regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); |
| 55 | if (IS_ERR(regmap)) { |
| 56 | dev_err(&client->dev, "failed to init registers map"); |
| 57 | return PTR_ERR(regmap); |
| 58 | } |
| 59 | |
| 60 | return zpa2326_probe(&client->dev, i2c_id->name, client->irq, |
| 61 | zpa2326_i2c_hwid(client), regmap); |
| 62 | } |
| 63 | |
| 64 | static int zpa2326_remove_i2c(struct i2c_client *client) |
| 65 | { |
| 66 | zpa2326_remove(&client->dev); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static const struct i2c_device_id zpa2326_i2c_ids[] = { |
| 72 | { "zpa2326", 0 }, |
| 73 | { }, |
| 74 | }; |
| 75 | MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); |
| 76 | |
| 77 | #if defined(CONFIG_OF) |
| 78 | static const struct of_device_id zpa2326_i2c_matches[] = { |
| 79 | { .compatible = "murata,zpa2326" }, |
| 80 | { } |
| 81 | }; |
| 82 | MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); |
| 83 | #endif |
| 84 | |
| 85 | static struct i2c_driver zpa2326_i2c_driver = { |
| 86 | .driver = { |
| 87 | .name = "zpa2326-i2c", |
| 88 | .of_match_table = of_match_ptr(zpa2326_i2c_matches), |
| 89 | .pm = ZPA2326_PM_OPS, |
| 90 | }, |
| 91 | .probe = zpa2326_probe_i2c, |
| 92 | .remove = zpa2326_remove_i2c, |
| 93 | .id_table = zpa2326_i2c_ids, |
| 94 | }; |
| 95 | module_i2c_driver(zpa2326_i2c_driver); |
| 96 | |
| 97 | MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); |
| 98 | MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); |
| 99 | MODULE_LICENSE("GPL v2"); |