Merge tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[cascardo/linux.git] / drivers / iio / pressure / zpa2326_i2c.c

diff --git a/drivers/iio/pressure/zpa2326_i2c.c b/drivers/iio/pressure/zpa2326_i2c.c
new file mode 100644 (file)
index 0000000..e4d27dd
--- /dev/null
+++ b/drivers/iio/pressure/zpa2326_i2c.c
@@ -0,0 +1,99 @@
+/*
+ * Murata ZPA2326 I2C pressure and temperature sensor driver
+ *
+ * Copyright (c) 2016 Parrot S.A.
+ *
+ * Author: Gregor Boirie <gregor.boirie@parrot.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/i2c.h>
+#include <linux/of_device.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 int zpa2326_remove_i2c(struct i2c_client *client)
+{
+       zpa2326_remove(&client->dev);
+
+       return 0;
+}
+
+static const struct i2c_device_id zpa2326_i2c_ids[] = {
+       { "zpa2326", 0 },
+       { },
+};
+MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);
+
+#if defined(CONFIG_OF)
+static const struct of_device_id zpa2326_i2c_matches[] = {
+       { .compatible = "murata,zpa2326" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);
+#endif
+
+static struct i2c_driver zpa2326_i2c_driver = {
+       .driver = {
+               .name           = "zpa2326-i2c",
+               .of_match_table = of_match_ptr(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");