[PATCH v4 1/2] hwmon: (ads7828) driver cleanup
From: Vivien Didelot
Date: Tue Oct 02 2012 - 23:33:44 EST
* Remove module parameters, add a ads7828_platform_data;
* Move driver declaration to avoid adding function prototypes;
* Remove unused macros;
* Coding Style fixes.
Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/hwmon/ads7828 | 31 +++--
drivers/hwmon/ads7828.c | 206 ++++++++++++++++------------------
include/linux/platform_data/ads7828.h | 29 +++++
3 files changed, 147 insertions(+), 119 deletions(-)
create mode 100644 include/linux/platform_data/ads7828.h
diff --git a/Documentation/hwmon/ads7828 b/Documentation/hwmon/ads7828
index 2bbebe6..b35668c 100644
--- a/Documentation/hwmon/ads7828
+++ b/Documentation/hwmon/ads7828
@@ -5,21 +5,32 @@ Supported chips:
* Texas Instruments/Burr-Brown ADS7828
Prefix: 'ads7828'
Addresses scanned: I2C 0x48, 0x49, 0x4a, 0x4b
- Datasheet: Publicly available at the Texas Instruments website :
+ Datasheet: Publicly available at the Texas Instruments website:
http://focus.ti.com/lit/ds/symlink/ads7828.pdf
Authors:
Steve Hardy <shardy@xxxxxxxxxx>
-Module Parameters
------------------
-
-* se_input: bool (default Y)
- Single ended operation - set to N for differential mode
-* int_vref: bool (default Y)
- Operate with the internal 2.5V reference - set to N for external reference
-* vref_mv: int (default 2500)
- If using an external reference, set this to the reference voltage in mV
+Platform data
+-------------
+
+The ads7828 driver accepts an optional ads7828_platform_data structure (defined
+in include/linux/platform_data/ads7828.h). If no structure is provided, the
+configuration defaults to single ended operation and internal vref (2.5V).
+
+The structure fields are:
+
+* diff_input: bool
+ Differential operation - set to true for differential mode,
+ false for default single ended mode.
+* ext_vref: bool
+ External reference - set to true if it operates with an external reference,
+ false for default internal reference.
+* vref_mv: int
+ Voltage reference - if using an external reference, set this to the reference
+ voltage in mV, otherwise, it will default to the internal value (2500mV).
+ This value will be bounded with limits accepted by the chip, described in the
+ datasheet.
Description
-----------
diff --git a/drivers/hwmon/ads7828.c b/drivers/hwmon/ads7828.c
index 1f9e8af..756bd1b 100644
--- a/drivers/hwmon/ads7828.c
+++ b/drivers/hwmon/ads7828.c
@@ -6,7 +6,7 @@
*
* Written by Steve Hardy <shardy@xxxxxxxxxx>
*
- * Datasheet available at: http://focus.ti.com/lit/ds/symlink/ads7828.pdf
+ * For further information, see the Documentation/hwmon/ads7828 file.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -23,63 +23,48 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/jiffies.h>
-#include <linux/i2c.h>
+#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
-#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/platform_data/ads7828.h>
+#include <linux/slab.h>
/* The ADS7828 registers */
-#define ADS7828_NCH 8 /* 8 channels of 12-bit A-D supported */
-#define ADS7828_CMD_SD_SE 0x80 /* Single ended inputs */
-#define ADS7828_CMD_SD_DIFF 0x00 /* Differential inputs */
-#define ADS7828_CMD_PD0 0x0 /* Power Down between A-D conversions */
-#define ADS7828_CMD_PD1 0x04 /* Internal ref OFF && A-D ON */
-#define ADS7828_CMD_PD2 0x08 /* Internal ref ON && A-D OFF */
-#define ADS7828_CMD_PD3 0x0C /* Internal ref ON && A-D ON */
-#define ADS7828_INT_VREF_MV 2500 /* Internal vref is 2.5V, 2500mV */
+#define ADS7828_NCH 8 /* 8 channels supported */
+#define ADS7828_CMD_SD_SE 0x80 /* Single ended inputs */
+#define ADS7828_CMD_PD1 0x04 /* Internal vref OFF && A/D ON */
+#define ADS7828_CMD_PD3 0x0C /* Internal vref ON && A/D ON */
+#define ADS7828_INT_VREF_MV 2500 /* Internal vref is 2.5V, 2500mV */
+#define ADS7828_EXT_VREF_MV_MIN 50 /* External vref min value 0.05V */
+#define ADS7828_EXT_VREF_MV_MAX 5250 /* External vref max value 5.25V */
/* Addresses to scan */
-static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
+static const unsigned short ads7828_normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
I2C_CLIENT_END };
-/* Module parameters */
-static bool se_input = 1; /* Default is SE, 0 == diff */
-static bool int_vref = 1; /* Default is internal ref ON */
-static int vref_mv = ADS7828_INT_VREF_MV; /* set if vref != 2.5V */
-module_param(se_input, bool, S_IRUGO);
-module_param(int_vref, bool, S_IRUGO);
-module_param(vref_mv, int, S_IRUGO);
-
-/* Global Variables */
-static u8 ads7828_cmd_byte; /* cmd byte without channel bits */
-static unsigned int ads7828_lsb_resol; /* resolution of the ADC sample lsb */
-
-/* Each client has this additional data */
+/* Client specific data */
struct ads7828_data {
struct device *hwmon_dev;
- struct mutex update_lock; /* mutex protect updates */
- char valid; /* !=0 if following fields are valid */
- unsigned long last_updated; /* In jiffies */
- u16 adc_input[ADS7828_NCH]; /* ADS7828_NCH 12-bit samples */
+ struct mutex update_lock; /* Mutex protecting updates */
+ unsigned long last_updated; /* Last updated time (in jiffies) */
+ u16 adc_input[ADS7828_NCH]; /* ADS7828_NCH samples */
+ bool valid; /* Validity flag */
+ bool diff_input; /* Differential input */
+ bool ext_vref; /* External voltage reference */
+ unsigned int vref_mv; /* voltage reference value */
+ u8 cmd_byte; /* Command byte without channel bits */
+ unsigned int lsb_resol; /* Resolution of the ADC sample LSB */
};
-/* Function declaration - necessary due to function dependencies */
-static int ads7828_detect(struct i2c_client *client,
- struct i2c_board_info *info);
-static int ads7828_probe(struct i2c_client *client,
- const struct i2c_device_id *id);
-
-static inline u8 channel_cmd_byte(int ch)
+/* Command byte C2,C1,C0 - see datasheet */
+static inline u8 ads7828_cmd_byte(u8 cmd, int ch)
{
- /* cmd byte C2,C1,C0 - see datasheet */
- u8 cmd = (((ch>>1) | (ch&0x01)<<2)<<4);
- cmd |= ads7828_cmd_byte;
- return cmd;
+ return cmd | (((ch >> 1) | (ch & 0x01) << 2) << 4);
}
/* Update data for the device (all 8 channels) */
@@ -96,12 +81,12 @@ static struct ads7828_data *ads7828_update_device(struct device *dev)
dev_dbg(&client->dev, "Starting ads7828 update\n");
for (ch = 0; ch < ADS7828_NCH; ch++) {
- u8 cmd = channel_cmd_byte(ch);
+ u8 cmd = ads7828_cmd_byte(data->cmd_byte, ch);
data->adc_input[ch] =
i2c_smbus_read_word_swapped(client, cmd);
}
data->last_updated = jiffies;
- data->valid = 1;
+ data->valid = true;
}
mutex_unlock(&data->update_lock);
@@ -110,28 +95,25 @@ static struct ads7828_data *ads7828_update_device(struct device *dev)
}
/* sysfs callback function */
-static ssize_t show_in(struct device *dev, struct device_attribute *da,
- char *buf)
+static ssize_t ads7828_show_in(struct device *dev, struct device_attribute *da,
+ char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct ads7828_data *data = ads7828_update_device(dev);
- /* Print value (in mV as specified in sysfs-interface documentation) */
- return sprintf(buf, "%d\n", (data->adc_input[attr->index] *
- ads7828_lsb_resol)/1000);
-}
+ unsigned int value = DIV_ROUND_CLOSEST(data->adc_input[attr->index] *
+ data->lsb_resol, 1000);
-#define in_reg(offset)\
-static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in,\
- NULL, offset)
+ return sprintf(buf, "%d\n", value);
+}
-in_reg(0);
-in_reg(1);
-in_reg(2);
-in_reg(3);
-in_reg(4);
-in_reg(5);
-in_reg(6);
-in_reg(7);
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ads7828_show_in, NULL, 0);
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ads7828_show_in, NULL, 1);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ads7828_show_in, NULL, 2);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ads7828_show_in, NULL, 3);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ads7828_show_in, NULL, 4);
+static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ads7828_show_in, NULL, 5);
+static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ads7828_show_in, NULL, 6);
+static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, ads7828_show_in, NULL, 7);
static struct attribute *ads7828_attributes[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
@@ -152,35 +134,19 @@ static const struct attribute_group ads7828_group = {
static int ads7828_remove(struct i2c_client *client)
{
struct ads7828_data *data = i2c_get_clientdata(client);
+
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &ads7828_group);
+
return 0;
}
-static const struct i2c_device_id ads7828_id[] = {
- { "ads7828", 0 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, ads7828_id);
-
-/* This is the driver that will be inserted */
-static struct i2c_driver ads7828_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "ads7828",
- },
- .probe = ads7828_probe,
- .remove = ads7828_remove,
- .id_table = ads7828_id,
- .detect = ads7828_detect,
- .address_list = normal_i2c,
-};
-
/* Return 0 if detection is successful, -ENODEV otherwise */
static int ads7828_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
+ u8 default_cmd_byte = ADS7828_CMD_SD_SE | ADS7828_CMD_PD3;
int ch;
/* Check we have a valid client */
@@ -195,9 +161,12 @@ static int ads7828_detect(struct i2c_client *client,
* - Check the top 4 bits of each result are not set (12 data bits)
*/
for (ch = 0; ch < ADS7828_NCH; ch++) {
- u16 in_data;
- u8 cmd = channel_cmd_byte(ch);
- in_data = i2c_smbus_read_word_swapped(client, cmd);
+ u8 cmd = ads7828_cmd_byte(default_cmd_byte, ch);
+ u16 in_data = i2c_smbus_read_word_swapped(client, cmd);
+
+ if (in_data < 0)
+ return -ENODEV;
+
if (in_data & 0xF000) {
pr_debug("%s : Doesn't look like an ads7828 device\n",
__func__);
@@ -213,6 +182,7 @@ static int ads7828_detect(struct i2c_client *client,
static int ads7828_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct ads7828_platform_data *pdata = client->dev.platform_data;
struct ads7828_data *data;
int err;
@@ -221,10 +191,30 @@ static int ads7828_probe(struct i2c_client *client,
if (!data)
return -ENOMEM;
+ if (pdata) {
+ data->diff_input = pdata->diff_input;
+ data->ext_vref = pdata->ext_vref;
+ if (data->ext_vref)
+ data->vref_mv = pdata->vref_mv;
+ }
+
+ /* Bound Vref with min/max values if it was provided */
+ if (data->vref_mv)
+ data->vref_mv = SENSORS_LIMIT(data->vref_mv,
+ ADS7828_EXT_VREF_MV_MIN,
+ ADS7828_EXT_VREF_MV_MAX);
+ else
+ data->vref_mv = ADS7828_INT_VREF_MV;
+
+ data->lsb_resol = DIV_ROUND_CLOSEST(data->vref_mv * 1000, 4096);
+
+ data->cmd_byte = data->ext_vref ? ADS7828_CMD_PD1 : ADS7828_CMD_PD3;
+ if (!data->diff_input)
+ data->cmd_byte |= ADS7828_CMD_SD_SE;
+
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
- /* Register sysfs hooks */
err = sysfs_create_group(&client->dev.kobj, &ads7828_group);
if (err)
return err;
@@ -232,38 +222,36 @@ static int ads7828_probe(struct i2c_client *client,
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
- goto exit_remove;
+ goto error;
}
return 0;
-exit_remove:
+error:
sysfs_remove_group(&client->dev.kobj, &ads7828_group);
return err;
}
-static int __init sensors_ads7828_init(void)
-{
- /* Initialize the command byte according to module parameters */
- ads7828_cmd_byte = se_input ?
- ADS7828_CMD_SD_SE : ADS7828_CMD_SD_DIFF;
- ads7828_cmd_byte |= int_vref ?
- ADS7828_CMD_PD3 : ADS7828_CMD_PD1;
-
- /* Calculate the LSB resolution */
- ads7828_lsb_resol = (vref_mv*1000)/4096;
+static const struct i2c_device_id ads7828_device_ids[] = {
+ { "ads7828", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ads7828_device_ids);
- return i2c_add_driver(&ads7828_driver);
-}
+static struct i2c_driver ads7828_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "ads7828",
+ },
+ .address_list = ads7828_normal_i2c,
+ .detect = ads7828_detect,
+ .probe = ads7828_probe,
+ .remove = ads7828_remove,
+ .id_table = ads7828_device_ids,
+};
-static void __exit sensors_ads7828_exit(void)
-{
- i2c_del_driver(&ads7828_driver);
-}
+module_i2c_driver(ads7828_driver);
-MODULE_AUTHOR("Steve Hardy <shardy@xxxxxxxxxx>");
-MODULE_DESCRIPTION("ADS7828 driver");
MODULE_LICENSE("GPL");
-
-module_init(sensors_ads7828_init);
-module_exit(sensors_ads7828_exit);
+MODULE_AUTHOR("Steve Hardy <shardy@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for TI ADS7828 A/D converter");
diff --git a/include/linux/platform_data/ads7828.h b/include/linux/platform_data/ads7828.h
new file mode 100644
index 0000000..3245f45
--- /dev/null
+++ b/include/linux/platform_data/ads7828.h
@@ -0,0 +1,29 @@
+/*
+ * TI ADS7828 A/D Converter platform data definition
+ *
+ * Copyright (c) 2012 Savoir-faire Linux Inc.
+ * Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
+ *
+ * For further information, see the Documentation/hwmon/ads7828 file.
+ *
+ * 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.
+ */
+
+#ifndef _PDATA_ADS7828_H
+#define _PDATA_ADS7828_H
+
+/**
+ * struct ads7828_platform_data - optional ADS7828 connectivity info
+ * @diff_input: Differential input mode.
+ * @ext_vref: Use an external voltage reference.
+ * @vref_mv: Voltage reference value, if external.
+ */
+struct ads7828_platform_data {
+ bool diff_input;
+ bool ext_vref;
+ unsigned int vref_mv;
+};
+
+#endif /* _PDATA_ADS7828_H */
--
1.7.11.4
--
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