Hi Jonathan,
Thanks for your valuable comments. Please find my reply inline.
On 08/07/2014 07:06 AM, Jonathan Cameron wrote:
On 01/08/14 04:02, Kuppuswamy Sathyanarayanan wrote:
This patch adds a new driver for solteam opto JSA1212 proximity and
ambient light sensor.
Basic details of the chip can be found here.
http://www.solteamopto.com.tw/detail.php?ms=3&po_unit=2&pt_unit=29&p_unit=120
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Very nice. Some small comments inline.
The only element I really care about is the opaque use of a flags field
when a bitfield (or even booleans) would lead to clearer / simpler code.
I agree. if its just just two modes I would go for a bool. But I am
planning to add event support for both proximity
and ALS modules. Once I do that, I would end up with four bool values
for four modes supported. That's why
I thought I could simplify things with flags.
Do you think I should use bool for now and when I add event support I
can change it if needed ?
Jonathan
---
drivers/iio/light/Kconfig | 10 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/jsa1212.c | 490 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 501 insertions(+)
create mode 100644 drivers/iio/light/jsa1212.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index c89740d..07d0a76 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -87,6 +87,16 @@ config HID_SENSOR_PROX
To compile this driver as a module, choose M here: the
module will be called hid-sensor-prox.
+config JSA1212
+ tristate "JSA1212 ALS and proximity sensor driver"
+ depends on I2C
+ help
+ Say Y here if you want to build a IIO driver for JSA1212
+ proximity & ALS sensor device.
+
+ To compile this driver as a module, choose M here:
+ the module will be called jsa1212.
+
config SENSORS_LM3533
tristate "LM3533 ambient light sensor"
depends on MFD_LM3533
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 3eb36e5..ce85c86 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_CM36651) += cm36651.o
obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o
+obj-$(CONFIG_JSA1212) += jsa1212.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_LTR501) += ltr501.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
diff --git a/drivers/iio/light/jsa1212.c b/drivers/iio/light/jsa1212.c
new file mode 100644
index 0000000..1597183
--- /dev/null
+++ b/drivers/iio/light/jsa1212.c
@@ -0,0 +1,490 @@
+/*
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.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 defaults */
+#define JSA1212_CONF_REG_DEF 0x58
+#define JSA1212_INT_REG_DEF 0x02
+#define JSA1212_PXS_LT_REG_DEF 0x00
+#define JSA1212_PXS_HT_REG_DEF 0xFF
+#define JSA1212_ALS_TH1_REG_DEF 0x00
+#define JSA1212_ALS_TH2_REG_DEF 0xF0
+#define JSA1212_ALS_TH3_REG_DEF 0xFF
+#define JSA1212_ALS_RNG_REG_DEF 0x00
+
+/* 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 0xFFF
+#define JSA1212_ALS_DT1_MASK 0xFF
+#define JSA1212_ALS_DT2_MASK 0x0F
+#define JSA1212_ALS_RNG_MASK 0x07
+#define JSA1212_REG_MASK 0xFF
+
+/* 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
+
+/* 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 0xC8
+#define JSA1212_PXS_DELAY_MS 0x64
+
+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;
I'd be tempted to use a bit field in place of the opaque flags.
That way it is obvious what this can contain.
+ unsigned long flags;
+};
+
+/* ALS range idx to val mapping */
+static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
+ 128, 128, 128};
+
+static int jsa1212_reg_update(struct jsa1212_data *data, u8 reg, u8 bit_mask,
+ u8 new_val)
+{
+ u8 old_cmd, new_cmd;
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, reg);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "%s: read reg (0X%02X) cmd failed\n",
+ __func__, reg);
+ return ret;
+ }
+
+ old_cmd = ret & JSA1212_REG_MASK;
+ new_cmd = old_cmd & ~bit_mask;
+ new_cmd |= new_val & bit_mask;
+
+ if (new_cmd != old_cmd) {
+ ret = i2c_smbus_write_byte_data(data->client, reg, new_cmd);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "%s: write reg (0X%02X) cmd (0X%02X) failed\n",
+ __func__, reg, new_cmd);
+ return ret;
+ }
+ }
Perhaps it would be better to use regmap and avoid rerolling standard
functionality?
Using regmap would involve adding lot of initialization code. I thought
its more complicated than adding a single update function.
+
+ return 0;
+}
+
+/* Enables or disables ALS function based on status */
+static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
+{
+ int ret;
+
+ ret = jsa1212_reg_update(data, JSA1212_CONF_REG,
+ JSA1212_CONF_ALS_MASK,
+ status);
+ if (ret < 0)
+ return ret;
+
+ if (status)
+ set_bit(JSA1212_OPMODE_ALS_EN, &data->flags);
+ else
+ clear_bit(JSA1212_OPMODE_ALS_EN, &data->flags);
+
+ return ret;
+}
+
+/* Enables or disables PXS function based on status */
+static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
+{
+ int ret;
+
+ ret = jsa1212_reg_update(data, JSA1212_CONF_REG,
+ JSA1212_CONF_PXS_MASK,
+ status);
+ if (ret < 0)
+ return ret;
+
+ if (status)
+ set_bit(JSA1212_OPMODE_PXS_EN, &data->flags);
+ else
+ clear_bit(JSA1212_OPMODE_PXS_EN, &data->flags);
+
+ return ret;
+}
+
+static int jsa1212_read_als_data(struct jsa1212_data *data,
+ unsigned int *val)
+{
+ int ret;
+
+ 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 = i2c_smbus_read_word_data(data->client, JSA1212_ALS_DT1_REG);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "als data read err\n");
+ return ret;
+ }
+
+ *val = ret & JSA1212_ALS_DATA_MASK;
+
+ ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int jsa1212_read_pxs_data(struct jsa1212_data *data,
+ unsigned int *val)
+{
+ int ret;
+
+ 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 = i2c_smbus_read_byte_data(data->client, JSA1212_PXS_DATA_REG);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "pxs data read err\n");
+ return ret;
+ }
+
+ *val = ret & JSA1212_PXS_DATA_MASK;
+
+ ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+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;
+ }
You could simplify this a tiny bit by having the read functions return
IIO_VAL_INT on success, but it's probably not worth doing..
+ ret = ret < 0 ? ret : IIO_VAL_INT;
+ mutex_unlock(&data->lock);
+ break;
+ 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 */
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+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 = i2c_smbus_write_byte_data(data->client, JSA1212_CONF_REG,
+ JSA1212_CONF_REG_DEF);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, JSA1212_INT_REG,
+ JSA1212_INT_REG_DEF);
+ if (ret < 0)
+ return ret;
+
+ data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
+ data->flags = 0x00;
This will already be true as it is created with a kzalloc call.
Agree. I will remove it.
+
+ return 0;
+}
+
+static int jsa1212_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct jsa1212_data *jsa1212_data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*jsa1212_data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ jsa1212_data = iio_priv(indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+ jsa1212_data->client = client;
+
+ mutex_init(&jsa1212_data->lock);
+
+ ret = jsa1212_chip_init(jsa1212_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 = id->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;
+ }
+
+ return 0;
+}
+
+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);
+ int ret;
+
+ mutex_lock(&data->lock);
+
+ ret = jsa1212_reg_update(data, JSA1212_CONF_REG,
+ JSA1212_CONF_ALS_MASK |
+ JSA1212_CONF_PXS_MASK,
+ JSA1212_CONF_ALS_DISABLE |
+ JSA1212_CONF_PXS_DISABLE);
+
+ if (ret < 0)
+ dev_err(&client->dev, "power off cmd failed\n");
+
+ mutex_unlock(&data->lock);
+
+ iio_device_unregister(indio_dev);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int jsa1212_suspend(struct device *dev)
+{
+ int ret;
+ struct jsa1212_data *data;
+
+ data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+ mutex_lock(&data->lock);
+
+ ret = jsa1212_reg_update(data, JSA1212_CONF_REG,
+ JSA1212_CONF_ALS_MASK |
+ JSA1212_CONF_PXS_MASK,
+ JSA1212_CONF_ALS_DISABLE |
+ JSA1212_CONF_PXS_DISABLE);
+
+ if (ret < 0)
+ dev_err(dev, "suspend cmd failed\n");
+
+ mutex_unlock(&data->lock);
+
+ return ret;
Given the remove and the suspend have ended up pretty similar,
perhaps a utility function would cut down on code repitition?
Makes sense. I will add a disable_all() helper function.
+}
+
+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 (test_bit(JSA1212_OPMODE_ALS_EN, &data->flags)) {
+ ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
+ if (ret < 0) {
+ dev_err(dev, "als resume failed\n");
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ }
+
+ if (test_bit(JSA1212_OPMODE_PXS_EN, &data->flags)) {
+ ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
+ if (ret < 0)
+ dev_err(dev, "pxs resume failed\n");
+ }
+
+ 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", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, jsa1212_id);
+
+static struct i2c_driver jsa1212_driver = {
+ .driver = {
+ .name = "jsa1212",
+ .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@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
+MODULE_LICENSE("GPL v2");
--
Sathyanarayanan Kuppuswamy
Android kernel developer
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