---
drivers/hwmon/Kconfig | 9 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/ads787x.c | 199 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/ads787x.h | 51 ++++++++++++
4 files changed, 260 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/ads787x.c
create mode 100644 drivers/hwmon/ads787x.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 68cf877..4f49ed2 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -169,6 +169,15 @@ config SENSORS_ADM9240
This driver can also be built as a module. If so, the module
will be called adm9240.
+
+config SENSORS_ADS787x
+ tristate "TI ADS787x A/D converter"
+ depends on SPI
+ help
+ If you say yes here you get support for TI ADS7871, ....
+
+ This driver can also be built as a module. If so, the module
+ will be called ads7871.
config SENSORS_ADT7462
tristate "Analog Devices ADT7462"
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 4bc215c..6c1eb6c 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_SENSORS_ADM1029) += adm1029.o
obj-$(CONFIG_SENSORS_ADM1031) += adm1031.o
obj-$(CONFIG_SENSORS_ADM9240) += adm9240.o
obj-$(CONFIG_SENSORS_ADS7828) += ads7828.o
+obj-$(CONFIG_SENSORS_ADS787x) += ads787x.o
obj-$(CONFIG_SENSORS_ADT7462) += adt7462.o
obj-$(CONFIG_SENSORS_ADT7470) += adt7470.o
obj-$(CONFIG_SENSORS_ADT7473) += adt7473.o
diff --git a/drivers/hwmon/ads787x.c b/drivers/hwmon/ads787x.c
new file mode 100644
index 0000000..2fbf83f
--- /dev/null
+++ b/drivers/hwmon/ads787x.c
@@ -0,0 +1,199 @@
+/*
+ * ads787x - driver for TI ADS7871 A/D converter
+ *
+ * Copyright (c) 2010 Paul Thomas <pthomas8589@xxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * later as publishhed by the Free Software Foundation.
+ *
+ * You need to have something like this in struct spi_board_info
+ * {
+ * .modalias = "ads787x",
+ * .max_speed_hz = 2*1000*1000,
+ * .chip_select = 0,
+ * .bus_num = 1,
+ * },
+ */
+
+#define DEBUG 1
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/spi/spi.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+#include "ads787x.h"
+
+#define DEVICE_NAME "ads787x"
+
+struct ads787x_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+};
+
+static int mcp251x_read_reg8(struct spi_device *spi, int reg)
+{
+ int ret;
+ reg = (reg & 0x1f) | INST_READ_bm;
+ ret = spi_w8r8(spi, reg);
+ if (ret < 0)
+ return -EINVAL;
+
+ return ret;
+}
+
+static int mcp251x_write_reg8(struct spi_device *spi, int reg, u8 val)
+{
+ u8 tmp[2];
+ reg &= (reg & 0x1f);
+ tmp[0] = reg;
+ tmp[1] = val;
+ return spi_write(spi, tmp, sizeof(tmp));
+}
+
+static ssize_t show_voltage(struct device *dev,
+ struct device_attribute *da, char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ int ret, val, i=0;
+ uint8_t lb, hb, channel, mux_cnv;
+
+ channel = attr->index;
+ dev_dbg(&spi->dev, "setup REG_GAIN_MUX: channel = %d, ", channel);
+ mcp251x_write_reg8(spi, REG_GAIN_MUX,
+ (MUX_CNV_bm | MUX_M3_bm | channel));
+
+ ret = mcp251x_read_reg8(spi, REG_GAIN_MUX);
+ mux_cnv = ((ret & MUX_CNV_bm)>>MUX_CNV_bv);
+ while(i<10 && mux_cnv)
+ {
+ i++;
+ ret = mcp251x_read_reg8(spi, REG_GAIN_MUX);
+ mux_cnv = ((ret & MUX_CNV_bm)>>MUX_CNV_bv);
+ /*TODO: if a platform could do the SPI stuff fast enough
+ you could read before the conversion is complete
+ a delay or sleep could be added here*/
+ }
+ dev_dbg(&spi->dev, "ret = %x, mux_cnv = %d\n\n", ret, mux_cnv);
+
+ if(mux_cnv == 0)
+ {
+ lb = (mcp251x_read_reg8(spi, REG_LS_BYTE)>>2);
+ hb = mcp251x_read_reg8(spi, REG_MS_BYTE);
+ val = (hb<<6 | lb) & 0x1fff;
+
+ return sprintf(buf, "%d\n", val);
+ }
+ else return sprintf(buf, "%d\n", -1);
+}
+
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_voltage, NULL, 0);
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_voltage, NULL, 1);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_voltage, NULL, 2);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_voltage, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_voltage, NULL, 4);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_voltage, NULL, 5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_voltage, NULL, 6);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, show_voltage, NULL, 7);
+
+static struct attribute *ads787x_attributes[] = {
+ &sensor_dev_attr_in0_input.dev_attr.attr,
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ &sensor_dev_attr_in2_input.dev_attr.attr,
+ &sensor_dev_attr_in3_input.dev_attr.attr,
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+ &sensor_dev_attr_in5_input.dev_attr.attr,
+ &sensor_dev_attr_in6_input.dev_attr.attr,
+ &sensor_dev_attr_in7_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group ads787x_group = {
+ .attrs = ads787x_attributes,
+};
+
+static int __devinit ads787x_probe(struct spi_device *spi)
+{
+ int status, ret;
+ struct ads787x_data *pdata;
+
+ dev_dbg(&spi->dev, "ads787x_probe\n");
+
+ pdata = kzalloc(sizeof(struct ads787x_data), GFP_KERNEL);
+
+ status = sysfs_create_group(&spi->dev.kobj, &ads787x_group);
+ dev_dbg(&spi->dev, "status(sysfs_create_group) = %d\n", status);
+
+ pdata->hwmon_dev = hwmon_device_register(&spi->dev);
+ spi_set_drvdata(spi, pdata);
+
+ if (IS_ERR(pdata->hwmon_dev))
+ {
+ dev_dbg(&spi->dev, "hwmon_device_register: IS_ERR\n");
+ }
+
+ /* Configure the SPI bus */
+ spi->mode = (SPI_MODE_0);
+ spi->bits_per_word = 8;
+ spi_setup(spi);
+
+ mcp251x_write_reg8(spi, REG_SER_CONTROL, 0);
+ ret = mcp251x_read_reg8(spi, REG_SER_CONTROL);
+
+ mcp251x_write_reg8(spi, REG_OSC_CONTROL,
+ (OSC_OSCR_bm | OSC_OSCE_bm | OSC_REFE_bm | OSC_BUFE_bm));
+ ret = mcp251x_read_reg8(spi, REG_OSC_CONTROL);
+
+ mcp251x_write_reg8(spi, REG_AD_CONTROL, 0);
+ ret = mcp251x_read_reg8(spi, REG_AD_CONTROL);
+
+ return 0;
+}
+
+static int __devexit ads787x_remove(struct spi_device *spi)
+{
+ struct ads787x_data *pdata = spi_get_drvdata(spi);
+
+ dev_dbg(&spi->dev, "ads787x_remove\n\n\n");
+ hwmon_device_unregister(pdata->hwmon_dev);
+ sysfs_remove_group(&spi->dev.kobj, &ads787x_group);
+ return 0;
+}
+
+static struct spi_driver ads787x_driver = {
+ .driver = {
+ .name = DEVICE_NAME,
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+
+ .probe = ads787x_probe,
+ .remove = __devexit_p(ads787x_remove),
+};
+
+static int __init ads787x_init(void)
+{
+ return spi_register_driver(&ads787x_driver);
+}
+
+static void __exit ads787x_exit(void)
+{
+ spi_unregister_driver(&ads787x_driver);
+}
+
+module_init(ads787x_init);
+module_exit(ads787x_exit);
+
+MODULE_AUTHOR("Paul Thomas <pthomas8589@xxxxxxxxx>");
+MODULE_DESCRIPTION("TI ADS787x A/D driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/ads787x.h b/drivers/hwmon/ads787x.h
new file mode 100644
index 0000000..56737a3
--- /dev/null
+++ b/drivers/hwmon/ads787x.h
@@ -0,0 +1,51 @@
+/*
+ * ads787x - driver for TI ADS7871 A/D converter
+ *
+ * Copyright (c) 2010 Paul Thomas <pthomas8589@xxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * later as publishhed by the Free Software Foundation.
+ */
+
+/*From figure 18 in the datasheet*/
+/*Register addresses*/
+#define REG_LS_BYTE 0 /*A/D Output Data, LS Byte*/
+#define REG_MS_BYTE 1 /*A/D Output Data, MS Byte*/
+#define REG_PGA_VALID 2 /*PGA Valid Register*/
+#define REG_AD_CONTROL 3 /*A/D Control Register*/
+#define REG_GAIN_MUX 4 /*Gain/Mux Register*/
+#define REG_IO_STATE 5 /*Digital I/O State Register*/
+#define REG_IO_CONTROL 6 /*Digital I/O Control Register*/
+#define REG_OSC_CONTROL 7 /*Rev/Oscillator Control Register*/
+#define REG_SER_CONTROL 24 /*Serial Interface Control Register*/
+#define REG_ID 31 /*ID Register*/
+
+/*From figure 17 in the datasheet
+* These bits get ORed with the address to form
+* the instruction byte */
+/*Instruction Bit masks*/
+#define INST_MODE_bm (1<<7)
+#define INST_READ_bm (1<<6)
+#define INST_16BIT_bm (1<<5)
+
+/*From figure 18 in the datasheet*/
+/*bit masks for Rev/Oscillator Control Register*/
+#define MUX_CNV_bv 7
+#define MUX_CNV_bm (1<<MUX_CNV_bv)
+#define MUX_M3_bm (1<<3) /*M3 selects single ended*/
+#define MUX_G_bv 4 /*allows for reg = (gain << MUX_G_bv) | ...*/
+
+/*From figure 18 in the datasheet*/
+/*bit masks for Rev/Oscillator Control Register*/
+#define OSC_OSCR_bm (1<<5)
+#define OSC_OSCE_bm (1<<4)
+#define OSC_REFE_bm (1<<3)
+#define OSC_BUFE_bm (1<<2)
+#define OSC_R2V_bm (1<<1)
+#define OSC_RBG_bm (1<<0)
\ No newline at end of file
--
1.6.2.5
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