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authorJean Delvare <khali@linux-fr.org>2009-12-09 14:35:56 -0500
committerJean Delvare <khali@linux-fr.org>2009-12-09 14:35:56 -0500
commita1fa4cdcc4abd4c02a81ab7052c16a342d29f060 (patch)
treeeb45b4d840192b90bdba1cba8bebb67fc564b233
parent2de1875a5894794b42fce3833cddf4eac55831de (diff)
hwmon: (w83l785ts) Clean up detect function
As kind is now hard-coded to -1, there is room for code clean-ups. Signed-off-by: Jean Delvare <khali@linux-fr.org>
-rw-r--r--drivers/hwmon/w83l785ts.c70
1 files changed, 23 insertions, 47 deletions
diff --git a/drivers/hwmon/w83l785ts.c b/drivers/hwmon/w83l785ts.c
index ea295b9fc4f4..9b6c4c10fba7 100644
--- a/drivers/hwmon/w83l785ts.c
+++ b/drivers/hwmon/w83l785ts.c
@@ -1,7 +1,7 @@
1/* 1/*
2 * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware 2 * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring 3 * monitoring
4 * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org> 4 * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org>
5 * 5 *
6 * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made 6 * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
7 * by Winbond. It reports a single external temperature with a 1 deg 7 * by Winbond. It reports a single external temperature with a 1 deg
@@ -146,60 +146,36 @@ static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
146 */ 146 */
147 147
148/* Return 0 if detection is successful, -ENODEV otherwise */ 148/* Return 0 if detection is successful, -ENODEV otherwise */
149static int w83l785ts_detect(struct i2c_client *new_client, int kind, 149static int w83l785ts_detect(struct i2c_client *client, int kind,
150 struct i2c_board_info *info) 150 struct i2c_board_info *info)
151{ 151{
152 struct i2c_adapter *adapter = new_client->adapter; 152 struct i2c_adapter *adapter = client->adapter;
153 u16 man_id;
154 u8 chip_id;
153 155
154 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 156 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
155 return -ENODEV; 157 return -ENODEV;
156 158
157 /* 159 /* detection */
158 * Now we do the remaining detection. A negative kind means that 160 if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80)
159 * the driver was loaded with no force parameter (default), so we 161 || (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) {
160 * must both detect and identify the chip (actually there is only 162 dev_dbg(&adapter->dev,
161 * one possible kind of chip for now, W83L785TS-S). A zero kind means 163 "W83L785TS-S detection failed at 0x%02x\n",
162 * that the driver was loaded with the force parameter, the detection 164 client->addr);
163 * step shall be skipped. A positive kind means that the driver 165 return -ENODEV;
164 * was loaded with the force parameter and a given kind of chip is
165 * requested, so both the detection and the identification steps
166 * are skipped.
167 */
168 if (kind < 0) { /* detection */
169 if (((w83l785ts_read_value(new_client,
170 W83L785TS_REG_CONFIG, 0) & 0x80) != 0x00)
171 || ((w83l785ts_read_value(new_client,
172 W83L785TS_REG_TYPE, 0) & 0xFC) != 0x00)) {
173 dev_dbg(&adapter->dev,
174 "W83L785TS-S detection failed at 0x%02x.\n",
175 new_client->addr);
176 return -ENODEV;
177 }
178 } 166 }
179 167
180 if (kind <= 0) { /* identification */ 168 /* Identification */
181 u16 man_id; 169 man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8)
182 u8 chip_id; 170 + w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0);
183 171 chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0);
184 man_id = (w83l785ts_read_value(new_client, 172
185 W83L785TS_REG_MAN_ID1, 0) << 8) + 173 if (man_id != 0x5CA3 /* Winbond */
186 w83l785ts_read_value(new_client, 174 || chip_id != 0x70) { /* W83L785TS-S */
187 W83L785TS_REG_MAN_ID2, 0); 175 dev_dbg(&adapter->dev,
188 chip_id = w83l785ts_read_value(new_client, 176 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
189 W83L785TS_REG_CHIP_ID, 0); 177 man_id, chip_id);
190 178 return -ENODEV;
191 if (man_id == 0x5CA3) { /* Winbond */
192 if (chip_id == 0x70) { /* W83L785TS-S */
193 kind = w83l785ts;
194 }
195 }
196
197 if (kind <= 0) { /* identification failed */
198 dev_info(&adapter->dev,
199 "Unsupported chip (man_id=0x%04X, "
200 "chip_id=0x%02X).\n", man_id, chip_id);
201 return -ENODEV;
202 }
203 } 179 }
204 180
205 strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE); 181 strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);