diff options
Diffstat (limited to 'drivers/iio/pressure/zpa2326_i2c.c')
-rw-r--r-- | drivers/iio/pressure/zpa2326_i2c.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/iio/pressure/zpa2326_i2c.c b/drivers/iio/pressure/zpa2326_i2c.c new file mode 100644 index 000000000..f26dd8cbb --- /dev/null +++ b/drivers/iio/pressure/zpa2326_i2c.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Murata ZPA2326 I2C pressure and temperature sensor driver + * + * Copyright (c) 2016 Parrot S.A. + * + * Author: Gregor Boirie <gregor.boirie@parrot.com> + */ + +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/i2c.h> +#include <linux/mod_devicetable.h> +#include "zpa2326.h" + +/* + * read_flag_mask: + * - address bit 7 must be set to request a register read operation + */ +static const struct regmap_config zpa2326_regmap_i2c_config = { + .reg_bits = 8, + .val_bits = 8, + .writeable_reg = zpa2326_isreg_writeable, + .readable_reg = zpa2326_isreg_readable, + .precious_reg = zpa2326_isreg_precious, + .max_register = ZPA2326_TEMP_OUT_H_REG, + .read_flag_mask = BIT(7), + .cache_type = REGCACHE_NONE, +}; + +static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client) +{ +#define ZPA2326_SA0(_addr) (_addr & BIT(0)) +#define ZPA2326_DEVICE_ID_SA0_SHIFT (1) + + /* Identification register bit 1 mirrors device address bit 0. */ + return (ZPA2326_DEVICE_ID | + (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT)); +} + +static int zpa2326_probe_i2c(struct i2c_client *client, + const struct i2c_device_id *i2c_id) +{ + struct regmap *regmap; + + regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "failed to init registers map"); + return PTR_ERR(regmap); + } + + return zpa2326_probe(&client->dev, i2c_id->name, client->irq, + zpa2326_i2c_hwid(client), regmap); +} + +static void zpa2326_remove_i2c(struct i2c_client *client) +{ + zpa2326_remove(&client->dev); +} + +static const struct i2c_device_id zpa2326_i2c_ids[] = { + { "zpa2326", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids); + +static const struct of_device_id zpa2326_i2c_matches[] = { + { .compatible = "murata,zpa2326" }, + { } +}; +MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches); + +static struct i2c_driver zpa2326_i2c_driver = { + .driver = { + .name = "zpa2326-i2c", + .of_match_table = zpa2326_i2c_matches, + .pm = ZPA2326_PM_OPS, + }, + .probe = zpa2326_probe_i2c, + .remove = zpa2326_remove_i2c, + .id_table = zpa2326_i2c_ids, +}; +module_i2c_driver(zpa2326_i2c_driver); + +MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>"); +MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(IIO_ZPA2326); |