diff options
Diffstat (limited to 'drivers/hwmon/ltc4245.c')
| -rw-r--r-- | drivers/hwmon/ltc4245.c | 134 |
1 files changed, 7 insertions, 127 deletions
diff --git a/drivers/hwmon/ltc4245.c b/drivers/hwmon/ltc4245.c index 034b2c51584..65c232a9d0c 100644 --- a/drivers/hwmon/ltc4245.c +++ b/drivers/hwmon/ltc4245.c @@ -22,15 +22,6 @@ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> -/* Valid addresses are 0x20 - 0x3f - * - * For now, we do not probe, since some of these addresses - * are known to be unfriendly to probing */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_1(ltc4245); - /* Here are names of the chip's registers (a.k.a. commands) */ enum ltc4245_cmd { LTC4245_STATUS = 0x00, /* readonly */ @@ -369,9 +360,13 @@ static const struct attribute_group ltc4245_group = { static int ltc4245_probe(struct i2c_client *client, const struct i2c_device_id *id) { + struct i2c_adapter *adapter = client->adapter; struct ltc4245_data *data; int ret; + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) { ret = -ENOMEM; @@ -382,7 +377,8 @@ static int ltc4245_probe(struct i2c_client *client, mutex_init(&data->update_lock); /* Initialize the LTC4245 chip */ - /* TODO */ + i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00); + i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00); /* Register sysfs hooks */ ret = sysfs_create_group(&client->dev.kobj, <c4245_group); @@ -417,136 +413,20 @@ static int ltc4245_remove(struct i2c_client *client) return 0; } -/* Check that some bits in a control register appear at all possible - * locations without changing value - * - * @client: the i2c client to use - * @reg: the register to read - * @bits: the bits to check (0xff checks all bits, - * 0x03 checks only the last two bits) - * - * return -ERRNO if the register read failed - * return -ENODEV if the register value doesn't stay constant at all - * possible addresses - * - * return 0 for success - */ -static int ltc4245_check_control_reg(struct i2c_client *client, u8 reg, u8 bits) -{ - int i; - s32 v, voff1, voff2; - - /* Read register and check for error */ - v = i2c_smbus_read_byte_data(client, reg); - if (v < 0) - return v; - - v &= bits; - - for (i = 0x00; i < 0xff; i += 0x20) { - - voff1 = i2c_smbus_read_byte_data(client, reg + i); - if (voff1 < 0) - return voff1; - - voff2 = i2c_smbus_read_byte_data(client, reg + i + 0x08); - if (voff2 < 0) - return voff2; - - voff1 &= bits; - voff2 &= bits; - - if (v != voff1 || v != voff2) - return -ENODEV; - } - - return 0; -} - -static int ltc4245_detect(struct i2c_client *client, - int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) - return -ENODEV; - - if (kind < 0) { /* probed detection - check the chip type */ - s32 v; /* 8 bits from the chip, or -ERRNO */ - - /* Chip registers 0x00-0x07 are control registers - * Chip registers 0x10-0x1f are data registers - * - * Address bits b7-b5 are ignored. This makes the chip "repeat" - * in steps of 0x20. Any control registers should appear with - * the same values across all duplicated addresses. - * - * Register 0x02 bit b2 is reserved, expect 0 - * Register 0x07 bits b7 to b4 are reserved, expect 0 - * - * Registers 0x01, 0x02 are control registers and should not - * change on their own. - * - * Register 0x06 bits b6 and b7 are control bits, and should - * not change on their own. - * - * Register 0x07 bits b3 to b0 are control bits, and should - * not change on their own. - */ - - /* read register 0x02 reserved bit, expect 0 */ - v = i2c_smbus_read_byte_data(client, LTC4245_CONTROL); - if (v < 0 || (v & 0x04) != 0) - return -ENODEV; - - /* read register 0x07 reserved bits, expect 0 */ - v = i2c_smbus_read_byte_data(client, LTC4245_ADCADR); - if (v < 0 || (v & 0xf0) != 0) - return -ENODEV; - - /* check that the alert register appears at all locations */ - if (ltc4245_check_control_reg(client, LTC4245_ALERT, 0xff)) - return -ENODEV; - - /* check that the control register appears at all locations */ - if (ltc4245_check_control_reg(client, LTC4245_CONTROL, 0xff)) - return -ENODEV; - - /* check that register 0x06 bits b6 and b7 stay constant */ - if (ltc4245_check_control_reg(client, LTC4245_GPIO, 0xc0)) - return -ENODEV; - - /* check that register 0x07 bits b3-b0 stay constant */ - if (ltc4245_check_control_reg(client, LTC4245_ADCADR, 0x0f)) - return -ENODEV; - } - - strlcpy(info->type, "ltc4245", I2C_NAME_SIZE); - dev_info(&adapter->dev, "ltc4245 %s at address 0x%02x\n", - kind < 0 ? "probed" : "forced", - client->addr); - - return 0; -} - static const struct i2c_device_id ltc4245_id[] = { - { "ltc4245", ltc4245 }, + { "ltc4245", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, ltc4245_id); /* This is the driver that will be inserted */ static struct i2c_driver ltc4245_driver = { - .class = I2C_CLASS_HWMON, .driver = { .name = "ltc4245", }, .probe = ltc4245_probe, .remove = ltc4245_remove, .id_table = ltc4245_id, - .detect = ltc4245_detect, - .address_data = &addr_data, }; static int __init ltc4245_init(void) |