--- /dev/null
+/*
+ * JSA1212 Ambient Light & Proximity Sensor Driver
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
+ *
+ * TODO: Interrupt support, thresholds, range support.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* JSA1212 reg address */
+#define JSA1212_CONF_REG 0x01
+#define JSA1212_INT_REG 0x02
+#define JSA1212_PXS_LT_REG 0x03
+#define JSA1212_PXS_HT_REG 0x04
+#define JSA1212_ALS_TH1_REG 0x05
+#define JSA1212_ALS_TH2_REG 0x06
+#define JSA1212_ALS_TH3_REG 0x07
+#define JSA1212_PXS_DATA_REG 0x08
+#define JSA1212_ALS_DT1_REG 0x09
+#define JSA1212_ALS_DT2_REG 0x0A
+#define JSA1212_ALS_RNG_REG 0x0B
+#define JSA1212_MAX_REG 0x0C
+
+/* JSA1212 reg masks */
+#define JSA1212_CONF_MASK 0xFF
+#define JSA1212_INT_MASK 0xFF
+#define JSA1212_PXS_LT_MASK 0xFF
+#define JSA1212_PXS_HT_MASK 0xFF
+#define JSA1212_ALS_TH1_MASK 0xFF
+#define JSA1212_ALS_TH2_LT_MASK 0x0F
+#define JSA1212_ALS_TH2_HT_MASK 0xF0
+#define JSA1212_ALS_TH3_MASK 0xFF
+#define JSA1212_PXS_DATA_MASK 0xFF
+#define JSA1212_ALS_DATA_MASK 0x0FFF
+#define JSA1212_ALS_DT1_MASK 0xFF
+#define JSA1212_ALS_DT2_MASK 0x0F
+#define JSA1212_ALS_RNG_MASK 0x07
+
+/* JSA1212 CONF REG bits */
+#define JSA1212_CONF_PXS_MASK 0x80
+#define JSA1212_CONF_PXS_ENABLE 0x80
+#define JSA1212_CONF_PXS_DISABLE 0x00
+#define JSA1212_CONF_ALS_MASK 0x04
+#define JSA1212_CONF_ALS_ENABLE 0x04
+#define JSA1212_CONF_ALS_DISABLE 0x00
+#define JSA1212_CONF_IRDR_MASK 0x08
+/* Proxmity sensing IRDR current sink settings */
+#define JSA1212_CONF_IRDR_200MA 0x08
+#define JSA1212_CONF_IRDR_100MA 0x00
+#define JSA1212_CONF_PXS_SLP_MASK 0x70
+#define JSA1212_CONF_PXS_SLP_0MS 0x70
+#define JSA1212_CONF_PXS_SLP_12MS 0x60
+#define JSA1212_CONF_PXS_SLP_50MS 0x50
+#define JSA1212_CONF_PXS_SLP_75MS 0x40
+#define JSA1212_CONF_PXS_SLP_100MS 0x30
+#define JSA1212_CONF_PXS_SLP_200MS 0x20
+#define JSA1212_CONF_PXS_SLP_400MS 0x10
+#define JSA1212_CONF_PXS_SLP_800MS 0x00
+
+/* JSA1212 INT REG bits */
+#define JSA1212_INT_CTRL_MASK 0x01
+#define JSA1212_INT_CTRL_EITHER 0x00
+#define JSA1212_INT_CTRL_BOTH 0x01
+#define JSA1212_INT_ALS_PRST_MASK 0x06
+#define JSA1212_INT_ALS_PRST_1CONV 0x00
+#define JSA1212_INT_ALS_PRST_4CONV 0x02
+#define JSA1212_INT_ALS_PRST_8CONV 0x04
+#define JSA1212_INT_ALS_PRST_16CONV 0x06
+#define JSA1212_INT_ALS_FLAG_MASK 0x08
+#define JSA1212_INT_ALS_FLAG_CLR 0x00
+#define JSA1212_INT_PXS_PRST_MASK 0x60
+#define JSA1212_INT_PXS_PRST_1CONV 0x00
+#define JSA1212_INT_PXS_PRST_4CONV 0x20
+#define JSA1212_INT_PXS_PRST_8CONV 0x40
+#define JSA1212_INT_PXS_PRST_16CONV 0x60
+#define JSA1212_INT_PXS_FLAG_MASK 0x80
+#define JSA1212_INT_PXS_FLAG_CLR 0x00
+
+/* JSA1212 ALS RNG REG bits */
+#define JSA1212_ALS_RNG_0_2048 0x00
+#define JSA1212_ALS_RNG_0_1024 0x01
+#define JSA1212_ALS_RNG_0_512 0x02
+#define JSA1212_ALS_RNG_0_256 0x03
+#define JSA1212_ALS_RNG_0_128 0x04
+
+/* JSA1212 INT threshold range */
+#define JSA1212_ALS_TH_MIN 0x0000
+#define JSA1212_ALS_TH_MAX 0x0FFF
+#define JSA1212_PXS_TH_MIN 0x00
+#define JSA1212_PXS_TH_MAX 0xFF
+
+#define JSA1212_ALS_DELAY_MS 200
+#define JSA1212_PXS_DELAY_MS 100
+
+#define JSA1212_DRIVER_NAME "jsa1212"
+#define JSA1212_REGMAP_NAME "jsa1212_regmap"
+
+enum jsa1212_op_mode {
+ JSA1212_OPMODE_ALS_EN,
+ JSA1212_OPMODE_PXS_EN,
+};
+
+struct jsa1212_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ u8 als_rng_idx;
+ bool als_en; /* ALS enable status */
+ bool pxs_en; /* proximity enable status */
+ struct regmap *regmap;
+};
+
+/* ALS range idx to val mapping */
+static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
+ 128, 128, 128};
+
+/* Enables or disables ALS function based on status */
+static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
+{
+ int ret;
+
+ ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+ JSA1212_CONF_ALS_MASK,
+ status);
+ if (ret < 0)
+ return ret;
+
+ data->als_en = !!status;
+
+ return 0;
+}
+
+/* Enables or disables PXS function based on status */
+static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
+{
+ int ret;
+
+ ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+ JSA1212_CONF_PXS_MASK,
+ status);
+ if (ret < 0)
+ return ret;
+
+ data->pxs_en = !!status;
+
+ return 0;
+}
+
+static int jsa1212_read_als_data(struct jsa1212_data *data,
+ unsigned int *val)
+{
+ int ret;
+ __le16 als_data;
+
+ ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
+ if (ret < 0)
+ return ret;
+
+ /* Delay for data output */
+ msleep(JSA1212_ALS_DELAY_MS);
+
+ /* Read 12 bit data */
+ ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "als data read err\n");
+ goto als_data_read_err;
+ }
+
+ *val = le16_to_cpu(als_data);
+
+als_data_read_err:
+ return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
+}
+
+static int jsa1212_read_pxs_data(struct jsa1212_data *data,
+ unsigned int *val)
+{
+ int ret;
+ unsigned int pxs_data;
+
+ ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
+ if (ret < 0)
+ return ret;
+
+ /* Delay for data output */
+ msleep(JSA1212_PXS_DELAY_MS);
+
+ /* Read out all data */
+ ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "pxs data read err\n");
+ goto pxs_data_read_err;
+ }
+
+ *val = pxs_data & JSA1212_PXS_DATA_MASK;
+
+pxs_data_read_err:
+ return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
+}
+
+static int jsa1212_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int ret;
+ struct jsa1212_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->lock);
+ switch (chan->type) {
+ case IIO_LIGHT:
+ ret = jsa1212_read_als_data(data, val);
+ break;
+ case IIO_PROXIMITY:
+ ret = jsa1212_read_pxs_data(data, val);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&data->lock);
+ return ret < 0 ? ret : IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_LIGHT:
+ *val = jsa1212_als_range_val[data->als_rng_idx];
+ *val2 = BIT(12); /* Max 12 bit value */
+ return IIO_VAL_FRACTIONAL;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_chan_spec jsa1212_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ },
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ }
+};
+
+static const struct iio_info jsa1212_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &jsa1212_read_raw,
+};
+
+static int jsa1212_chip_init(struct jsa1212_data *data)
+{
+ int ret;
+
+ ret = regmap_write(data->regmap, JSA1212_CONF_REG,
+ (JSA1212_CONF_PXS_SLP_50MS |
+ JSA1212_CONF_IRDR_200MA));
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->regmap, JSA1212_INT_REG,
+ JSA1212_INT_ALS_PRST_4CONV);
+ if (ret < 0)
+ return ret;
+
+ data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
+
+ return 0;
+}
+
+static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case JSA1212_PXS_DATA_REG:
+ case JSA1212_ALS_DT1_REG:
+ case JSA1212_ALS_DT2_REG:
+ case JSA1212_INT_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static struct regmap_config jsa1212_regmap_config = {
+ .name = JSA1212_REGMAP_NAME,
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = JSA1212_MAX_REG,
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_reg = jsa1212_is_volatile_reg,
+};
+
+static int jsa1212_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct jsa1212_data *data;
+ struct iio_dev *indio_dev;
+ struct regmap *regmap;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ regmap = devm_regmap_init_i2c(client, &jsa1212_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "Regmap initialization failed.\n");
+ return PTR_ERR(regmap);
+ }
+
+ data = iio_priv(indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ data->regmap = regmap;
+
+ mutex_init(&data->lock);
+
+ ret = jsa1212_chip_init(data);
+ if (ret < 0)
+ return ret;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = jsa1212_channels;
+ indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
+ indio_dev->name = JSA1212_DRIVER_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ indio_dev->info = &jsa1212_info;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ dev_err(&client->dev, "%s: register device failed\n", __func__);
+
+ return ret;
+}
+
+ /* power off the device */
+static int jsa1212_power_off(struct jsa1212_data *data)
+{
+ int ret;
+
+ mutex_lock(&data->lock);
+
+ ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
+ JSA1212_CONF_ALS_MASK |
+ JSA1212_CONF_PXS_MASK,
+ JSA1212_CONF_ALS_DISABLE |
+ JSA1212_CONF_PXS_DISABLE);
+
+ if (ret < 0)
+ dev_err(&data->client->dev, "power off cmd failed\n");
+
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int jsa1212_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct jsa1212_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ return jsa1212_power_off(data);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int jsa1212_suspend(struct device *dev)
+{
+ struct jsa1212_data *data;
+
+ data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+ return jsa1212_power_off(data);
+}
+
+static int jsa1212_resume(struct device *dev)
+{
+ int ret = 0;
+ struct jsa1212_data *data;
+
+ data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+ mutex_lock(&data->lock);
+
+ if (data->als_en) {
+ ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
+ if (ret < 0) {
+ dev_err(dev, "als resume failed\n");
+ goto unlock_and_ret;
+ }
+ }
+
+ if (data->pxs_en) {
+ ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
+ if (ret < 0)
+ dev_err(dev, "pxs resume failed\n");
+ }
+
+unlock_and_ret:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
+
+#define JSA1212_PM_OPS (&jsa1212_pm_ops)
+#else
+#define JSA1212_PM_OPS NULL
+#endif
+
+static const struct acpi_device_id jsa1212_acpi_match[] = {
+ {"JSA1212", 0},
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
+
+static const struct i2c_device_id jsa1212_id[] = {
+ { JSA1212_DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, jsa1212_id);
+
+static struct i2c_driver jsa1212_driver = {
+ .driver = {
+ .name = JSA1212_DRIVER_NAME,
+ .pm = JSA1212_PM_OPS,
+ .owner = THIS_MODULE,
+ .acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
+ },
+ .probe = jsa1212_probe,
+ .remove = jsa1212_remove,
+ .id_table = jsa1212_id,
+};
+module_i2c_driver(jsa1212_driver);
+
+MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
+MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff