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Date: Tue, 10 Nov 2015 09:38:54 +0000
From: Florian Lobmaier <Florian.Lobmaier@....com>
To: "jic23@...nel.org" <jic23@...nel.org>
CC: Elitsa Polizoeva <Elitsa.Polizoeva@....com>,
"knaack.h@....de" <knaack.h@....de>,
"lars@...afoo.de" <lars@...afoo.de>,
"pmeerw@...erw.net" <pmeerw@...erw.net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: [PATCH V1 1/1] iio: as6200: add AS6200 temperature sensor driver from
ams AG
The AS6200 is a compact temperature sensor chip with I2C interface.
Add a driver to support the AS6200 temperature sensor.
Signed-off-by: Elitsa Polizoeva <elitsa.polizoeva@....com>
Signed-off-by: Florian Lobmaier <florian.lobmaier@....com>
---
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index 21feaa4..dc5dba8 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -3,6 +3,16 @@
#
menu "Temperature sensors"
+config AS6200
+ tristate "ams AG AS6200 temperature sensor"
+ depends on I2C
+ help
+ If you say yes here you get support for the AS6200 temperature
+ sensor from ams AG.
+
+ This driver can also be built as a module. If so, the module will
+ be called as6200.
+
config MLX90614
tristate "MLX90614 contact-less infrared sensor"
depends on I2C
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index 40710a8..c0c9a9a 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -2,5 +2,6 @@
# Makefile for industrial I/O temperature drivers
#
+obj-$(CONFIG_AS6200) += as6200.o
obj-$(CONFIG_MLX90614) += mlx90614.o
obj-$(CONFIG_TMP006) += tmp006.o
diff --git a/drivers/iio/temperature/as6200.c b/drivers/iio/temperature/as6200.c
new file mode 100644
index 0000000..fab1916
--- /dev/null
+++ b/drivers/iio/temperature/as6200.c
@@ -0,0 +1,942 @@
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/*
+ * Addresses to scan
+ * The slave address can be selected from a pool of four
+ * different address settings by connecting the input
+ * pin ADD0 of AS6200 to an appropriate signal as below:
+ * GND 0x48;
+ * VDD 0x49;
+ * SDA 0x4A;
+ * SCL 0x4B;
+ * If ADD0 pin is left unconnected, default address is
+ * 0x49
+*/
+static const unsigned short normal_i2c[] = {0x48, 0x49, 0x4a,
+ 0x4b, I2C_CLIENT_END };
+
+static const char * const as6200_conv_rates[] = { "4", "1", "0.25", "0.125" };
+static const char * const as6200_consec_faults[] = { "1", "2", "4", "6" };
+
+enum as6200_conf_fld {dw, al, cr, sm, im, pol, cf, ss};
+
+/* AS6200 registers */
+#define REG_TVAL 0x00
+#define REG_CONFIG 0x01
+#define REG_TLOW 0x02
+#define REG_THIGH 0x03
+
+static const struct i2c_device_id as6200_id[] = {
+ { "as6200", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, as6200_id);
+
+struct as6200_data {
+ struct mutex update_lock;
+ struct i2c_client *client;
+ int irqn;
+ char valid; /* !=0 if following fields are valid */
+
+ /* chip configuration */
+ u16 dw; /* 0:12-bit or 1:13-bit conversion mode */
+ u16 al; /* alert bit */
+ u16 cr; /* conversion rate */
+ u16 sm; /* continuous or sleep mode */
+ u16 im; /* comparator or interrupt mode */
+ u16 pol; /* polarity bit */
+ u16 cf; /* consecutive faults */
+ u16 ss; /* single shot conversion */
+
+ /* registers */
+ u16 config;
+ u16 thigh;
+ u16 tlow;
+ u16 tval;
+};
+
+static int as6200_read_reg(struct i2c_client *client,
+ u8 reg_num, u16 *reg_val)
+{
+ int err = 0;
+ char tx_buf[1];
+ char rx_buf[2];
+
+ if ((reg_num >= 0) & (reg_num <= 3)) {
+ tx_buf[0] = reg_num;
+ err = i2c_master_send(client, tx_buf, 1);
+ if (err == 1)
+ err = i2c_master_recv(client, rx_buf, 2);
+ if (err == 2) {
+ *reg_val = rx_buf[0];
+ *reg_val = *reg_val << 8;
+ *reg_val = *reg_val | rx_buf[1];
+ }
+ return err;
+ } else {
+ return -EINVAL;
+ }
+}
+
+static int as6200_write_reg(struct i2c_client *client,
+ u8 reg_num, const u16 reg_val)
+{
+ int err = 0;
+ char buf[3];
+
+ if ((reg_num >= 0) & (reg_num <= 3)) {
+ buf[0] = reg_num;
+ buf[1] = (char)((reg_val & 0xff00) >> 8);
+ buf[2] = (char)(reg_val & 0x00ff);
+ err = i2c_master_send(client, buf, 3);
+ return err;
+ } else {
+ return -EINVAL;
+ }
+}
+
+static u16 as6200_setConfig(struct i2c_client *client,
+ enum as6200_conf_fld fld, u16 val)
+{
+ struct as6200_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+ switch (fld) {
+ case dw:
+ data->dw = val;
+ break;
+ case al:
+ data->al = val;
+ break;
+ case cr:
+ data->cr = val;
+ break;
+ case sm:
+ data->sm = val;
+ break;
+ case im:
+ data->im = val;
+ break;
+ case pol:
+ data->pol = val;
+ break;
+ case cf:
+ data->cf = val;
+ break;
+ case ss:
+ data->ss = val;
+ break;
+ }
+ data->config = (data->dw << 4) |
+ (data->al << 5) |
+ (data->cr << 6) |
+ (data->sm << 8) |
+ (data->im << 9) |
+ (data->pol << 10) |
+ (data->cf << 11) |
+ (data->ss << 15);
+ mutex_unlock(&data->update_lock);
+ return data->config;
+}
+
+static int as6200_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err = 0;
+ u16 reg_val = 0;
+ s32 ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (channel->type == IIO_TEMP) {
+ err = as6200_read_reg(client, REG_TVAL, ®_val);
+ ret = reg_val;
+ *val = sign_extend32(ret, 15) >> 4;
+ }
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ if (channel->type == IIO_TEMP) {
+ *val = 62;
+ *val2 = 500000;
+ }
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ break;
+ }
+ return -EINVAL;
+}
+
+static irqreturn_t alert_isr(int irq, void *dev_id)
+{
+ dev_warn(dev_id, "Temperature outside of limits!");
+ return IRQ_HANDLED;
+}
+
+static int setupIRQ(struct iio_dev *indio_dev, bool set_gpio, u8 pol)
+{
+ int err;
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct device *dev = &data->client->dev;
+ int gpio = -1;
+ int irq_num;
+ int irq_trig;
+
+ if (pol == 1)
+ irq_trig = IRQF_TRIGGER_RISING;
+ else
+ irq_trig = IRQF_TRIGGER_FALLING;
+
+ if (set_gpio) {
+ gpio = of_get_named_gpio_flags(dev->of_node,
+ "as6200,irq-gpio", 0, 0);
+ err = gpio_request(gpio, "as6200_irq");
+ if (err) {
+ dev_info(dev, "%s: requesting gpio %d failed\n",
+ as6200_id[0].name, gpio);
+ return err;
+ }
+ err = gpio_direction_input(gpio);
+ if (err) {
+ dev_info(dev, "%s: gpio %d cannot apply direction\n",
+ as6200_id[0].name, gpio);
+ return err;
+ }
+ }
+ irq_num = gpio_to_irq(gpio);
+ dev_info(dev, "%s: registering for IRQ %d\n",
+ as6200_id[0].name, irq_num);
+ err = request_irq(irq_num, alert_isr, irq_trig,
+ as6200_id[0].name, dev);
+ if (err) {
+ dev_info(dev, "%s: error requesting irq %d\n",
+ as6200_id[0].name, err);
+ return err;
+ }
+ dev_info(dev, "%s: registered for IRQ %d\n",
+ as6200_id[0].name, irq_num);
+ mutex_lock(&data->update_lock);
+ data->irqn = irq_num;
+ mutex_unlock(&data->update_lock);
+
+ return 0;
+}
+
+static ssize_t as6200_show_thigh(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ s16 reg_val = 0;
+ int err = 0;
+ int val;
+
+ err = as6200_read_reg(client, REG_THIGH, ®_val);
+ reg_val = reg_val >> 4;
+ val = (625 * reg_val) / 10000;
+ return sprintf(buf, "%d%cC\n", val, (unsigned char)(248));
+}
+
+static ssize_t as6200_show_tlow(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ s16 reg_val = 0x00;
+ int err = 0;
+ int val;
+
+ err = as6200_read_reg(client, REG_TLOW, ®_val);
+ reg_val = reg_val >> 4;
+ val = (625 * reg_val) / 10000;
+ return sprintf(buf, "%d%cC\n", val, (unsigned char)(248));
+}
+
+static ssize_t as6200_show_thigh_reg(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_THIGH, ®_val);
+ return sprintf(buf, "%hX\n", reg_val);
+}
+
+static ssize_t as6200_show_tlow_reg(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_TLOW, ®_val);
+ return sprintf(buf, "%hX\n", reg_val);
+}
+
+static ssize_t as6200_show_config(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ return sprintf(buf, "%hX\n", reg_val);
+}
+
+static ssize_t as6200_show_dw(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ reg_val = (reg_val & 0x0010) >> 4;
+ if (reg_val == 0)
+ return sprintf(buf, "12-bit\n");
+ else if (reg_val == 1)
+ return sprintf(buf, "13-bit\n");
+ else
+ return sprintf(buf, "invalid\n");
+}
+
+static ssize_t as6200_show_al(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+ u16 pol = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ pol = (reg_val & 0x0400) >> 10;
+ reg_val = (reg_val & 0x0020) >> 5;
+ if (pol == 1) {
+ if (reg_val == 0)
+ return sprintf(buf, "off\n");
+ else if (reg_val == 1)
+ return sprintf(buf, "on\n");
+ else
+ return sprintf(buf, "invalid\n");
+ } else if (pol == 0) {
+ if (reg_val == 0)
+ return sprintf(buf, "on\n");
+ else if (reg_val == 1)
+ return sprintf(buf, "off\n");
+ else
+ return sprintf(buf, "invalid\n");
+ } else
+ return sprintf(buf, "invalid\n");
+}
+
+static ssize_t as6200_show_cr(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ reg_val = reg_val >> 6;
+ switch (reg_val) {
+ case 0:
+ return sprintf(buf, "4s\n");
+ case 1:
+ return sprintf(buf, "1s\n");
+ case 2:
+ return sprintf(buf, "250ms\n");
+ case 3:
+ return sprintf(buf, "125ms\n");
+ }
+ return sprintf(buf, "invalid\n");
+}
+
+static ssize_t as6200_show_sm(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ return sprintf(buf, "%hX\n", (reg_val & 0x0100) >> 8);
+}
+
+static ssize_t as6200_show_im(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ return sprintf(buf, "%hX\n", (reg_val & 0x0200) >> 9);
+}
+
+static ssize_t as6200_show_pol(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ return sprintf(buf, "%hX\n", (reg_val & 0x0400) >> 10);
+}
+
+static ssize_t as6200_show_cf(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ reg_val = (reg_val & 0x1800) >> 11;
+ switch (reg_val) {
+ case 0:
+ return sprintf(buf, "1\n");
+ case 1:
+ return sprintf(buf, "2\n");
+ case 2:
+ return sprintf(buf, "4\n");
+ case 3:
+ return sprintf(buf, "6\n");
+ }
+ return sprintf(buf, "invalid\n");
+}
+
+static ssize_t as6200_show_ss(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val = 0x00;
+ int err = 0;
+
+ err = as6200_read_reg(client, REG_CONFIG, ®_val);
+ return sprintf(buf, "%hX\n", (reg_val & 0x8000) >> 15);
+}
+
+static ssize_t as6200_set_thigh(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int err = 0;
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ s16 reg_val;
+ int val;
+
+ err = kstrtoint(buf, 0, &val);
+ if (err == 0) {
+ if ((val < -40) | (val > 150)) {
+ dev_info(&client->dev,
+ "Value for THIGH is invalid min = -40%cC, max = 150°C, val = %d°C",
+ (unsigned char)(248), val);
+ return count;
+ }
+ val = (val * 10000) / 625;
+ reg_val = val << 4;
+ err = as6200_write_reg(client, REG_THIGH, reg_val);
+ } else
+ dev_info(&client->dev,
+ "Converting value for THIGH failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_tlow(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err = 0;
+ s16 reg_val;
+ int val;
+
+ err = kstrtoint(buf, 0, &val);
+ if (err == 0) {
+ if ((val < -40) | (val > 150)) {
+ dev_info(&client->dev,
+ "Value for THIGH is invalid min = -40%cC, max = 150°C, val = %d°C",
+ (unsigned char)(248), val);
+ return count;
+ }
+ val = (val * 10000) / 625;
+ reg_val = val << 4;
+ err = as6200_write_reg(client, REG_TLOW, reg_val);
+ } else
+ dev_info(&client->dev,
+ "Converting value for TLOW failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_thigh_reg(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int err = 0;
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ u16 reg_val;
+
+ err = kstrtou16(buf, 0, ®_val);
+ if (err == 0)
+ err = as6200_write_reg(client, REG_THIGH, reg_val);
+ else
+ dev_info(&client->dev,
+ "Converting value for THIGH failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_tlow_reg(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err = 0;
+ u16 reg_val;
+
+ err = kstrtou16(buf, 0, ®_val);
+ if (err == 0)
+ err = as6200_write_reg(client, REG_TLOW, reg_val);
+ else
+ dev_info(&client->dev,
+ "Converting value for TLOW failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_config(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err = 0;
+ u16 reg_val;
+
+ err = kstrtou16(buf, 0, ®_val);
+ if (err == 0)
+ err = as6200_write_reg(client, REG_CONFIG, reg_val);
+ else
+ dev_info(&client->dev,
+ "Converting value for CONFIG failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_dw(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ if ((val != 12) && (val != 13)) {
+ dev_info(&client->dev,
+ "Value for data width not valid, val = %hx",
+ val);
+ return count;
+ }
+ if (val == 12)
+ new_conf = as6200_setConfig(client, dw, 0);
+ else if (val == 13)
+ new_conf = as6200_setConfig(client, dw, 1);
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for DW field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_cr(struct device *dev,
+struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ switch (val) {
+ case 4:
+ new_conf = as6200_setConfig(client, cr, 0);
+ break;
+ case 1:
+ new_conf = as6200_setConfig(client, cr, 1);
+ break;
+ case 250:
+ new_conf = as6200_setConfig(client, cr, 2);
+ break;
+ case 125:
+ new_conf = as6200_setConfig(client, cr, 3);
+ break;
+ default:
+ dev_info(&client->dev,
+ "Invalid value for CR field, val = %hx",
+ val);
+ return count;
+ }
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for CR field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_sm(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ new_conf = as6200_setConfig(client, sm, val);
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for SM field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_im(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ new_conf = as6200_setConfig(client, im, val);
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for IM field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_pol(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ int irq_num = data->irqn;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ free_irq(irq_num, dev);
+ new_conf = as6200_setConfig(client, pol, val);
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ setupIRQ(indio_dev, false, val);
+ } else
+ dev_info(&client->dev,
+ "Converting value for POL field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_cf(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ switch (val) {
+ case 1:
+ new_conf = as6200_setConfig(client, cf, 0);
+ break;
+ case 2:
+ new_conf = as6200_setConfig(client, cf, 1);
+ break;
+ case 4:
+ new_conf = as6200_setConfig(client, cf, 2);
+ break;
+ case 6:
+ new_conf = as6200_setConfig(client, cf, 3);
+ break;
+ default:
+ dev_info(&client->dev,
+ "Value for CF field invalid, val = %hx", val);
+ return count;
+ }
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for CF field failed, err = %hx",
+ err);
+ return count;
+}
+
+static ssize_t as6200_set_ss(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct as6200_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int err;
+ u16 val;
+ u16 new_conf;
+
+ err = kstrtou16(buf, 0, &val);
+ if (err == 0) {
+ new_conf = as6200_setConfig(client, ss, val);
+ err = as6200_write_reg(client, REG_CONFIG, new_conf);
+ } else
+ dev_info(&client->dev,
+ "Converting value for SS field failed, err = %hx",
+ err);
+ return count;
+}
+
+static IIO_DEVICE_ATTR(thigh, S_IWUSR | S_IRUGO, as6200_show_thigh,
+ as6200_set_thigh, 0);
+static IIO_DEVICE_ATTR(tlow, S_IWUSR | S_IRUGO, as6200_show_tlow,
+ as6200_set_tlow, 0);
+static IIO_DEVICE_ATTR(thigh_reg, S_IWUSR | S_IRUGO, as6200_show_thigh_reg,
+ as6200_set_thigh_reg, 0);
+static IIO_DEVICE_ATTR(tlow_reg, S_IWUSR | S_IRUGO, as6200_show_tlow_reg,
+ as6200_set_tlow_reg, 0);
+static IIO_DEVICE_ATTR(config, S_IWUSR | S_IRUGO, as6200_show_config,
+ as6200_set_config, 0);
+static IIO_DEVICE_ATTR(dw, S_IWUSR | S_IRUGO, as6200_show_dw,
+ as6200_set_dw, 0);
+static IIO_DEVICE_ATTR(al, S_IRUGO, as6200_show_al, NULL, 0);
+static IIO_DEVICE_ATTR(cr, S_IWUSR | S_IRUGO, as6200_show_cr,
+ as6200_set_cr, 0);
+static IIO_DEVICE_ATTR(sm, S_IWUSR | S_IRUGO, as6200_show_sm,
+ as6200_set_sm, 0);
+static IIO_DEVICE_ATTR(im, S_IWUSR | S_IRUGO, as6200_show_im,
+ as6200_set_im, 0);
+static IIO_DEVICE_ATTR(pol, S_IWUSR | S_IRUGO, as6200_show_pol,
+ as6200_set_pol, 0);
+static IIO_DEVICE_ATTR(cf, S_IWUSR | S_IRUGO, as6200_show_cf,
+ as6200_set_cf, 0);
+static IIO_DEVICE_ATTR(ss, S_IWUSR | S_IRUGO, as6200_show_ss,
+ as6200_set_ss, 0);
+
+static struct attribute *as6200_attrs[] = {
+ &iio_dev_attr_thigh.dev_attr.attr,
+ &iio_dev_attr_tlow.dev_attr.attr,
+ &iio_dev_attr_thigh_reg.dev_attr.attr,
+ &iio_dev_attr_tlow_reg.dev_attr.attr,
+ &iio_dev_attr_config.dev_attr.attr,
+ &iio_dev_attr_dw.dev_attr.attr,
+ &iio_dev_attr_al.dev_attr.attr,
+ &iio_dev_attr_cr.dev_attr.attr,
+ &iio_dev_attr_sm.dev_attr.attr,
+ &iio_dev_attr_im.dev_attr.attr,
+ &iio_dev_attr_pol.dev_attr.attr,
+ &iio_dev_attr_cf.dev_attr.attr,
+ &iio_dev_attr_ss.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group as6200_attr_group = {
+ .attrs = as6200_attrs,
+};
+
+static const struct iio_chan_spec as6200_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ }
+};
+
+static const struct iio_info as6200_info = {
+ .read_raw = as6200_read_raw,
+ .attrs = &as6200_attr_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int as6200_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ const char *name = NULL;
+ char tx_buf[1];
+ char rx_buf[2];
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
+ tx_buf[0] = 0x03;
+ i2c_master_send(client, tx_buf, 1);
+ i2c_master_recv(client, rx_buf, 2);
+ if (rx_buf[0] != 0x40 && rx_buf[1] != 0xA0)
+ return -ENODEV;
+
+ name = "as6200";
+
+ strlcpy(info->type, name, I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static void initClientData(struct as6200_data *data)
+{
+ data->dw = 0;
+ data->al = 1;
+ data->cr = 2; /* 250ms */
+ data->sm = 0; /* continuous or sleep mode */
+ data->im = 0; /* comparator */
+ data->pol = 0; /* alert irq active low */
+ data->cf = 0; /* 1 consecutive faults */
+ data->ss = 0; /* single shot conversion */
+
+ /* registers */
+ data->config = 0x40A0; /* reflect above settings */
+ data->thigh = 0x4B00;
+ data->tlow = 0x5000;
+}
+
+static int as6200_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev = NULL;
+ struct as6200_data *data = NULL;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = dev_name(&client->dev);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &as6200_info;
+
+ indio_dev->channels = as6200_channels;
+ indio_dev->num_channels = ARRAY_SIZE(as6200_channels);
+
+ initClientData(data);
+ mutex_init(&data->update_lock);
+ setupIRQ(indio_dev, true, 0);
+
+ return iio_device_register(indio_dev);
+}
+
+static int as6200_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ struct as6200_data *data;
+ int irq_num;
+
+ indio_dev = i2c_get_clientdata(client);
+ data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ irq_num = data->irqn;
+ free_irq(irq_num, &client->dev);
+ gpio_free(49);
+ return 0;
+}
+
+static struct i2c_driver as6200_driver = {
+ .driver = {
+ .name = "as6200",
+ .owner = THIS_MODULE,
+ },
+ .probe = as6200_probe,
+ .remove = as6200_remove,
+ .id_table = as6200_id,
+ .detect = as6200_detect,
+ .address_list = normal_i2c,
+};
+
+static int __init as6200_init(void)
+{
+ return i2c_add_driver(&as6200_driver);
+}
+
+static void __exit as6200_exit(void)
+{
+ i2c_del_driver(&as6200_driver);
+}
+module_init(as6200_init);
+module_exit(as6200_exit);
+
+MODULE_DESCRIPTION("ams AS6200 temperature sensor");
+MODULE_AUTHOR("Elitsa Polizoeva <elitsa.polizoeva@....com>");
+MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@....com>");
+MODULE_LICENSE("GPL");
--
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