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authorDavid Brownell <david-b@pacbell.net>2008-04-21 15:10:53 -0400
committerMark M. Hoffman <mhoffman@lightlink.com>2008-07-31 23:44:02 -0400
commit01a52397e95a8532c59506691759dba9262d6be7 (patch)
tree8429252add519af666178398de7cdfaef500402f /drivers/hwmon/lm75.c
parent321c4138573da888ca30a387e9973f690c217e9e (diff)
hwmon: (lm75) cleanup/reorg
Minor cleanup and reorg of the lm75 code. - Kconfig provides a larger list of lm75-compatible chips - A top comment now says what the driver does (!) ... as in, just what sort of sensor is this?? - Section comments now delineate the various sections of the driver: hwmon attributes, driver binding, register access, module glue. One driver binding function moved out of the attribute section, as did the driver struct itself. - Minor tweaks to legacy probe logic: correct a comment, and remove a pointless variable. - Whitespace, linelength, and comment fixes. This patch should include no functional changes. It's preparation for adding new-style (driver model) I2C driver binding. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Jean Delvare <khali@linux-fr.org> Acked-by: Laurent Pinchart <laurentp@cse-semaphore.com> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c90
1 files changed, 51 insertions, 39 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index de698dc73020..25ed26584100 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -30,14 +30,19 @@
30#include "lm75.h" 30#include "lm75.h"
31 31
32 32
33/* Addresses to scan */ 33/*
34 * This driver handles the LM75 and compatible digital temperature sensors.
35 * Compatibles include at least the DS75, DS1775, MCP980x, STDS75, TCN75,
36 * TMP100, TMP101, TMP75, TMP175, and TMP275.
37 */
38
39/* Addresses scanned by legacy style driver binding */
34static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 40static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
35 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; 41 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
36 42
37/* Insmod parameters */ 43/* Insmod parameters (only for legacy style driver binding) */
38I2C_CLIENT_INSMOD_1(lm75); 44I2C_CLIENT_INSMOD_1(lm75);
39 45
40/* Many LM75 constants specified below */
41 46
42/* The LM75 registers */ 47/* The LM75 registers */
43#define LM75_REG_CONF 0x01 48#define LM75_REG_CONF 0x01
@@ -50,9 +55,9 @@ static const u8 LM75_REG_TEMP[3] = {
50/* Each client has this additional data */ 55/* Each client has this additional data */
51struct lm75_data { 56struct lm75_data {
52 struct i2c_client client; 57 struct i2c_client client;
53 struct device *hwmon_dev; 58 struct device *hwmon_dev;
54 struct mutex update_lock; 59 struct mutex update_lock;
55 char valid; /* !=0 if following fields are valid */ 60 char valid; /* !=0 if registers are valid */
56 unsigned long last_updated; /* In jiffies */ 61 unsigned long last_updated; /* In jiffies */
57 u16 temp[3]; /* Register values, 62 u16 temp[3]; /* Register values,
58 0 = input 63 0 = input
@@ -60,23 +65,15 @@ struct lm75_data {
60 2 = hyst */ 65 2 = hyst */
61}; 66};
62 67
63static int lm75_attach_adapter(struct i2c_adapter *adapter);
64static int lm75_detect(struct i2c_adapter *adapter, int address, int kind);
65static void lm75_init_client(struct i2c_client *client); 68static void lm75_init_client(struct i2c_client *client);
66static int lm75_detach_client(struct i2c_client *client);
67static int lm75_read_value(struct i2c_client *client, u8 reg); 69static int lm75_read_value(struct i2c_client *client, u8 reg);
68static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); 70static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value);
69static struct lm75_data *lm75_update_device(struct device *dev); 71static struct lm75_data *lm75_update_device(struct device *dev);
70 72
71 73
72/* This is the driver that will be inserted */ 74/*-----------------------------------------------------------------------*/
73static struct i2c_driver lm75_driver = { 75
74 .driver = { 76/* sysfs attributes for hwmon */
75 .name = "lm75",
76 },
77 .attach_adapter = lm75_attach_adapter,
78 .detach_client = lm75_detach_client,
79};
80 77
81static ssize_t show_temp(struct device *dev, struct device_attribute *da, 78static ssize_t show_temp(struct device *dev, struct device_attribute *da,
82 char *buf) 79 char *buf)
@@ -109,13 +106,6 @@ static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
109 show_temp, set_temp, 2); 106 show_temp, set_temp, 2);
110static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 107static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
111 108
112static int lm75_attach_adapter(struct i2c_adapter *adapter)
113{
114 if (!(adapter->class & I2C_CLASS_HWMON))
115 return 0;
116 return i2c_probe(adapter, &addr_data, lm75_detect);
117}
118
119static struct attribute *lm75_attributes[] = { 109static struct attribute *lm75_attributes[] = {
120 &sensor_dev_attr_temp1_input.dev_attr.attr, 110 &sensor_dev_attr_temp1_input.dev_attr.attr,
121 &sensor_dev_attr_temp1_max.dev_attr.attr, 111 &sensor_dev_attr_temp1_max.dev_attr.attr,
@@ -128,6 +118,12 @@ static const struct attribute_group lm75_group = {
128 .attrs = lm75_attributes, 118 .attrs = lm75_attributes,
129}; 119};
130 120
121/*-----------------------------------------------------------------------*/
122
123/* "Legacy" I2C driver binding */
124
125static struct i2c_driver lm75_driver;
126
131/* This function is called by i2c_probe */ 127/* This function is called by i2c_probe */
132static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) 128static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
133{ 129{
@@ -135,15 +131,14 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
135 struct i2c_client *new_client; 131 struct i2c_client *new_client;
136 struct lm75_data *data; 132 struct lm75_data *data;
137 int err = 0; 133 int err = 0;
138 const char *name = "";
139 134
140 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 135 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
141 I2C_FUNC_SMBUS_WORD_DATA)) 136 I2C_FUNC_SMBUS_WORD_DATA))
142 goto exit; 137 goto exit;
143 138
144 /* OK. For now, we presume we have a valid client. We now create the 139 /* OK. For now, we presume we have a valid address. We create the
145 client structure, even though we cannot fill it completely yet. 140 client structure, even though there may be no sensor present.
146 But it allows us to access lm75_{read,write}_value. */ 141 But it allows us to use i2c_smbus_read_*_data() calls. */
147 if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) { 142 if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) {
148 err = -ENOMEM; 143 err = -ENOMEM;
149 goto exit; 144 goto exit;
@@ -174,17 +169,17 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
174 || i2c_smbus_read_word_data(new_client, 5) != hyst 169 || i2c_smbus_read_word_data(new_client, 5) != hyst
175 || i2c_smbus_read_word_data(new_client, 6) != hyst 170 || i2c_smbus_read_word_data(new_client, 6) != hyst
176 || i2c_smbus_read_word_data(new_client, 7) != hyst) 171 || i2c_smbus_read_word_data(new_client, 7) != hyst)
177 goto exit_free; 172 goto exit_free;
178 os = i2c_smbus_read_word_data(new_client, 3); 173 os = i2c_smbus_read_word_data(new_client, 3);
179 if (i2c_smbus_read_word_data(new_client, 4) != os 174 if (i2c_smbus_read_word_data(new_client, 4) != os
180 || i2c_smbus_read_word_data(new_client, 5) != os 175 || i2c_smbus_read_word_data(new_client, 5) != os
181 || i2c_smbus_read_word_data(new_client, 6) != os 176 || i2c_smbus_read_word_data(new_client, 6) != os
182 || i2c_smbus_read_word_data(new_client, 7) != os) 177 || i2c_smbus_read_word_data(new_client, 7) != os)
183 goto exit_free; 178 goto exit_free;
184 179
185 /* Unused bits */ 180 /* Unused bits */
186 if (conf & 0xe0) 181 if (conf & 0xe0)
187 goto exit_free; 182 goto exit_free;
188 183
189 /* Addresses cycling */ 184 /* Addresses cycling */
190 for (i = 8; i < 0xff; i += 8) 185 for (i = 8; i < 0xff; i += 8)
@@ -194,16 +189,10 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
194 goto exit_free; 189 goto exit_free;
195 } 190 }
196 191
197 /* Determine the chip type - only one kind supported! */ 192 /* NOTE: we treat "force=..." and "force_lm75=..." the same. */
198 if (kind <= 0) 193 strlcpy(new_client->name, "lm75", I2C_NAME_SIZE);
199 kind = lm75;
200
201 if (kind == lm75) {
202 name = "lm75";
203 }
204 194
205 /* Fill in the remaining client fields and put it into the global list */ 195 /* Fill in the remaining client fields and put it into the global list */
206 strlcpy(new_client->name, name, I2C_NAME_SIZE);
207 data->valid = 0; 196 data->valid = 0;
208 mutex_init(&data->update_lock); 197 mutex_init(&data->update_lock);
209 198
@@ -213,7 +202,7 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind)
213 202
214 /* Initialize the LM75 chip */ 203 /* Initialize the LM75 chip */
215 lm75_init_client(new_client); 204 lm75_init_client(new_client);
216 205
217 /* Register sysfs hooks */ 206 /* Register sysfs hooks */
218 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group))) 207 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group)))
219 goto exit_detach; 208 goto exit_detach;
@@ -236,6 +225,13 @@ exit:
236 return err; 225 return err;
237} 226}
238 227
228static int lm75_attach_adapter(struct i2c_adapter *adapter)
229{
230 if (!(adapter->class & I2C_CLASS_HWMON))
231 return 0;
232 return i2c_probe(adapter, &addr_data, lm75_detect);
233}
234
239static int lm75_detach_client(struct i2c_client *client) 235static int lm75_detach_client(struct i2c_client *client)
240{ 236{
241 struct lm75_data *data = i2c_get_clientdata(client); 237 struct lm75_data *data = i2c_get_clientdata(client);
@@ -246,6 +242,18 @@ static int lm75_detach_client(struct i2c_client *client)
246 return 0; 242 return 0;
247} 243}
248 244
245static struct i2c_driver lm75_driver = {
246 .driver = {
247 .name = "lm75",
248 },
249 .attach_adapter = lm75_attach_adapter,
250 .detach_client = lm75_detach_client,
251};
252
253/*-----------------------------------------------------------------------*/
254
255/* register access */
256
249/* All registers are word-sized, except for the configuration register. 257/* All registers are word-sized, except for the configuration register.
250 LM75 uses a high-byte first convention, which is exactly opposite to 258 LM75 uses a high-byte first convention, which is exactly opposite to
251 the SMBus standard. */ 259 the SMBus standard. */
@@ -309,6 +317,10 @@ static struct lm75_data *lm75_update_device(struct device *dev)
309 return data; 317 return data;
310} 318}
311 319
320/*-----------------------------------------------------------------------*/
321
322/* module glue */
323
312static int __init sensors_lm75_init(void) 324static int __init sensors_lm75_init(void)
313{ 325{
314 return i2c_add_driver(&lm75_driver); 326 return i2c_add_driver(&lm75_driver);