1*03b262f2SGregor Boirie /* 2*03b262f2SGregor Boirie * Murata ZPA2326 I2C pressure and temperature sensor driver 3*03b262f2SGregor Boirie * 4*03b262f2SGregor Boirie * Copyright (c) 2016 Parrot S.A. 5*03b262f2SGregor Boirie * 6*03b262f2SGregor Boirie * Author: Gregor Boirie <gregor.boirie@parrot.com> 7*03b262f2SGregor Boirie * 8*03b262f2SGregor Boirie * This program is free software; you can redistribute it and/or modify it 9*03b262f2SGregor Boirie * under the terms of the GNU General Public License version 2 as published by 10*03b262f2SGregor Boirie * the Free Software Foundation. 11*03b262f2SGregor Boirie * 12*03b262f2SGregor Boirie * This program is distributed in the hope that it will be useful, but WITHOUT 13*03b262f2SGregor Boirie * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14*03b262f2SGregor Boirie * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15*03b262f2SGregor Boirie * more details. 16*03b262f2SGregor Boirie */ 17*03b262f2SGregor Boirie 18*03b262f2SGregor Boirie #include <linux/module.h> 19*03b262f2SGregor Boirie #include <linux/regmap.h> 20*03b262f2SGregor Boirie #include <linux/i2c.h> 21*03b262f2SGregor Boirie #include <linux/of_device.h> 22*03b262f2SGregor Boirie #include "zpa2326.h" 23*03b262f2SGregor Boirie 24*03b262f2SGregor Boirie /* 25*03b262f2SGregor Boirie * read_flag_mask: 26*03b262f2SGregor Boirie * - address bit 7 must be set to request a register read operation 27*03b262f2SGregor Boirie */ 28*03b262f2SGregor Boirie static const struct regmap_config zpa2326_regmap_i2c_config = { 29*03b262f2SGregor Boirie .reg_bits = 8, 30*03b262f2SGregor Boirie .val_bits = 8, 31*03b262f2SGregor Boirie .writeable_reg = zpa2326_isreg_writeable, 32*03b262f2SGregor Boirie .readable_reg = zpa2326_isreg_readable, 33*03b262f2SGregor Boirie .precious_reg = zpa2326_isreg_precious, 34*03b262f2SGregor Boirie .max_register = ZPA2326_TEMP_OUT_H_REG, 35*03b262f2SGregor Boirie .read_flag_mask = BIT(7), 36*03b262f2SGregor Boirie .cache_type = REGCACHE_NONE, 37*03b262f2SGregor Boirie }; 38*03b262f2SGregor Boirie 39*03b262f2SGregor Boirie static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) 40*03b262f2SGregor Boirie { 41*03b262f2SGregor Boirie #define ZPA2326_SA0(_addr) (_addr & BIT(0)) 42*03b262f2SGregor Boirie #define ZPA2326_DEVICE_ID_SA0_SHIFT (1) 43*03b262f2SGregor Boirie 44*03b262f2SGregor Boirie /* Identification register bit 1 mirrors device address bit 0. */ 45*03b262f2SGregor Boirie return (ZPA2326_DEVICE_ID | 46*03b262f2SGregor Boirie (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); 47*03b262f2SGregor Boirie } 48*03b262f2SGregor Boirie 49*03b262f2SGregor Boirie static int zpa2326_probe_i2c(struct i2c_client *client, 50*03b262f2SGregor Boirie const struct i2c_device_id *i2c_id) 51*03b262f2SGregor Boirie { 52*03b262f2SGregor Boirie struct regmap *regmap; 53*03b262f2SGregor Boirie 54*03b262f2SGregor Boirie regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); 55*03b262f2SGregor Boirie if (IS_ERR(regmap)) { 56*03b262f2SGregor Boirie dev_err(&client->dev, "failed to init registers map"); 57*03b262f2SGregor Boirie return PTR_ERR(regmap); 58*03b262f2SGregor Boirie } 59*03b262f2SGregor Boirie 60*03b262f2SGregor Boirie return zpa2326_probe(&client->dev, i2c_id->name, client->irq, 61*03b262f2SGregor Boirie zpa2326_i2c_hwid(client), regmap); 62*03b262f2SGregor Boirie } 63*03b262f2SGregor Boirie 64*03b262f2SGregor Boirie static int zpa2326_remove_i2c(struct i2c_client *client) 65*03b262f2SGregor Boirie { 66*03b262f2SGregor Boirie zpa2326_remove(&client->dev); 67*03b262f2SGregor Boirie 68*03b262f2SGregor Boirie return 0; 69*03b262f2SGregor Boirie } 70*03b262f2SGregor Boirie 71*03b262f2SGregor Boirie static const struct i2c_device_id zpa2326_i2c_ids[] = { 72*03b262f2SGregor Boirie { "zpa2326", 0 }, 73*03b262f2SGregor Boirie { }, 74*03b262f2SGregor Boirie }; 75*03b262f2SGregor Boirie MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); 76*03b262f2SGregor Boirie 77*03b262f2SGregor Boirie #if defined(CONFIG_OF) 78*03b262f2SGregor Boirie static const struct of_device_id zpa2326_i2c_matches[] = { 79*03b262f2SGregor Boirie { .compatible = "murata,zpa2326" }, 80*03b262f2SGregor Boirie { } 81*03b262f2SGregor Boirie }; 82*03b262f2SGregor Boirie MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); 83*03b262f2SGregor Boirie #endif 84*03b262f2SGregor Boirie 85*03b262f2SGregor Boirie static struct i2c_driver zpa2326_i2c_driver = { 86*03b262f2SGregor Boirie .driver = { 87*03b262f2SGregor Boirie .name = "zpa2326-i2c", 88*03b262f2SGregor Boirie .of_match_table = of_match_ptr(zpa2326_i2c_matches), 89*03b262f2SGregor Boirie .pm = ZPA2326_PM_OPS, 90*03b262f2SGregor Boirie }, 91*03b262f2SGregor Boirie .probe = zpa2326_probe_i2c, 92*03b262f2SGregor Boirie .remove = zpa2326_remove_i2c, 93*03b262f2SGregor Boirie .id_table = zpa2326_i2c_ids, 94*03b262f2SGregor Boirie }; 95*03b262f2SGregor Boirie module_i2c_driver(zpa2326_i2c_driver); 96*03b262f2SGregor Boirie 97*03b262f2SGregor Boirie MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); 98*03b262f2SGregor Boirie MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); 99*03b262f2SGregor Boirie MODULE_LICENSE("GPL v2"); 100