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Date: Wed, 10 Jul 2013 11:25:08 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Wei Ni <wni@...dia.com>
Cc: khali@...ux-fr.org, swarren@...dotorg.org,
thierry.reding@...il.com, lm-sensors@...sensors.org,
linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 3/3] hwmon: (lm90) use enums for the indexes of temp8
and temp11
On Wed, Jul 10, 2013 at 07:25:39PM +0800, Wei Ni wrote:
> Using enums for the indexes and nrs of temp8 and temp11.
> This make the code much more readable.
>
> Signed-off-by: Wei Ni <wni@...dia.com>
I don't really have a strong opinion on this one. Nice, but is it really worth it ?
Jean, any comments ?
Guenter
> ---
> drivers/hwmon/lm90.c | 179 ++++++++++++++++++++++++++++++++------------------
> 1 file changed, 114 insertions(+), 65 deletions(-)
>
> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> index 88ff362..14e0b5b 100644
> --- a/drivers/hwmon/lm90.c
> +++ b/drivers/hwmon/lm90.c
> @@ -310,6 +310,59 @@ static const struct lm90_params lm90_params[] = {
> };
>
> /*
> + * TEMP8 register index
> + */
> +enum lm90_temp8_reg_index {
> + TEMP8_LOCAL_LOW = 0, /* 0: local low limit */
> + TEMP8_LOCAL_HIGH, /* 1: local high limit */
> + TEMP8_LOCAL_CRIT, /* 2: local critical limit */
> + TEMP8_REMOTE_CRIT, /* 3: remote critical limit */
> + TEMP8_LOCAL_EMERG, /* 4: local emergency limit
> + * (max6659 and max6695/96)
> + */
> + TEMP8_REMOTE_EMERG, /* 5: remote emergency limit
> + * (max6659 and max6695/96)
> + */
> + TEMP8_REMOTE2_CRIT, /* 6: remote 2 critical limit
> + * (max6695/96 only)
> + */
> + TEMP8_REMOTE2_EMERG, /* 7: remote 2 emergency limit
> + * (max6695/96 only)
> + */
> + TEMP8_REG_NUM
> +};
> +
> +/*
> + * TEMP11 register index
> + */
> +enum lm90_temp11_reg_index {
> + TEMP11_REMOTE_TEMP = 0, /* 0: remote input */
> + TEMP11_REMOTE_LOW, /* 1: remote low limit */
> + TEMP11_REMOTE_HIGH, /* 2: remote high limit */
> + TEMP11_REMOTE_OFFSET, /* 3: remote offset
> + * (except max6646, max6657/58/59,
> + * and max6695/96)
> + */
> + TEMP11_LOCAL_TEMP, /* 4: local input */
> + TEMP11_REMOTE2_TEMP, /* 5: remote 2 input (max6695/96 only) */
> + TEMP11_REMOTE2_LOW, /* 6: remote 2 low limit (max6695/96 only) */
> + TEMP11_REMOTE2_HIGH, /* 7: remote 2 high limit (max6695/96 only) */
> + TEMP11_REG_NUM
> +};
> +
> +/*
> + * TEMP11 register NR
> + */
> +enum lm90_temp11_reg_nr {
> + NR_CHAN_0_REMOTE_LOW = 0, /* 0: channel 0, remote low limit */
> + NR_CHAN_0_REMOTE_HIGH, /* 1: channel 0, remote high limit */
> + NR_CHAN_0_REMOTE_OFFSET, /* 2: channel 0, remote offset */
> + NR_CHAN_1_REMOTE_LOW, /* 3: channel 1, remote low limit */
> + NR_CHAN_1_REMOTE_HIGH, /* 4: channel 1, remote high limit */
> + NR_NUM /* number of the NRs for temp11 */
> +};
> +
> +/*
> * Client data (each client gets its own)
> */
>
> @@ -331,25 +384,8 @@ struct lm90_data {
> u8 reg_local_ext; /* local extension register offset */
>
> /* registers values */
> - s8 temp8[8]; /* 0: local low limit
> - * 1: local high limit
> - * 2: local critical limit
> - * 3: remote critical limit
> - * 4: local emergency limit (max6659 and max6695/96)
> - * 5: remote emergency limit (max6659 and max6695/96)
> - * 6: remote 2 critical limit (max6695/96 only)
> - * 7: remote 2 emergency limit (max6695/96 only)
> - */
> - s16 temp11[8]; /* 0: remote input
> - * 1: remote low limit
> - * 2: remote high limit
> - * 3: remote offset (except max6646, max6657/58/59,
> - * and max6695/96)
> - * 4: local input
> - * 5: remote 2 input (max6695/96 only)
> - * 6: remote 2 low limit (max6695/96 only)
> - * 7: remote 2 high limit (max6695/96 only)
> - */
> + s8 temp8[TEMP8_REG_NUM];
> + s16 temp11[TEMP11_REG_NUM];
> u8 temp_hyst;
> u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
> };
> @@ -491,37 +527,42 @@ static struct lm90_data *lm90_update_device(struct device *dev)
> u8 alarms;
>
> dev_dbg(&client->dev, "Updating lm90 data.\n");
> - lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
> - lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
> - lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
> - lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
> + lm90_read_reg(client, LM90_REG_R_LOCAL_LOW,
> + &data->temp8[TEMP8_LOCAL_LOW]);
> + lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH,
> + &data->temp8[TEMP8_LOCAL_HIGH]);
> + lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT,
> + &data->temp8[TEMP8_LOCAL_CRIT]);
> + lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
> + &data->temp8[TEMP8_REMOTE_CRIT]);
> lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
>
> if (data->reg_local_ext) {
> lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
> data->reg_local_ext,
> - &data->temp11[4]);
> + &data->temp11[TEMP11_LOCAL_TEMP]);
> } else {
> if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
> &h) == 0)
> - data->temp11[4] = h << 8;
> + data->temp11[TEMP11_LOCAL_TEMP] = h << 8;
> }
> lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
> - LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
> + LM90_REG_R_REMOTE_TEMPL,
> + &data->temp11[TEMP11_REMOTE_TEMP]);
>
> if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
> - data->temp11[1] = h << 8;
> + data->temp11[TEMP11_REMOTE_LOW] = h << 8;
> if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
> && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
> &l) == 0)
> - data->temp11[1] |= l;
> + data->temp11[TEMP11_REMOTE_LOW] |= l;
> }
> if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
> - data->temp11[2] = h << 8;
> + data->temp11[TEMP11_REMOTE_HIGH] = h << 8;
> if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
> && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
> &l) == 0)
> - data->temp11[2] |= l;
> + data->temp11[TEMP11_REMOTE_HIGH] |= l;
> }
>
> if (data->flags & LM90_HAVE_OFFSET) {
> @@ -529,13 +570,14 @@ static struct lm90_data *lm90_update_device(struct device *dev)
> &h) == 0
> && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
> &l) == 0)
> - data->temp11[3] = (h << 8) | l;
> + data->temp11[TEMP11_REMOTE_OFFSET] =
> + (h << 8) | l;
> }
> if (data->flags & LM90_HAVE_EMERGENCY) {
> lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
> - &data->temp8[4]);
> + &data->temp8[TEMP8_LOCAL_EMERG]);
> lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
> - &data->temp8[5]);
> + &data->temp8[TEMP8_REMOTE_EMERG]);
> }
> lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
> data->alarms = alarms; /* save as 16 bit value */
> @@ -543,15 +585,16 @@ static struct lm90_data *lm90_update_device(struct device *dev)
> if (data->kind == max6696) {
> lm90_select_remote_channel(client, data, 1);
> lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
> - &data->temp8[6]);
> + &data->temp8[TEMP8_REMOTE2_CRIT]);
> lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
> - &data->temp8[7]);
> + &data->temp8[TEMP8_REMOTE2_EMERG]);
> lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
> - LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
> + LM90_REG_R_REMOTE_TEMPL,
> + &data->temp11[TEMP11_REMOTE2_TEMP]);
> if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
> - data->temp11[6] = h << 8;
> + data->temp11[TEMP11_REMOTE2_LOW] = h << 8;
> if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
> - data->temp11[7] = h << 8;
> + data->temp11[TEMP11_REMOTE2_HIGH] = h << 8;
> lm90_select_remote_channel(client, data, 0);
>
> if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
> @@ -748,7 +791,7 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
>
> static void write_temp8(struct device *dev, int index, long val)
> {
> - static const u8 reg[8] = {
> + static const u8 reg[TEMP8_REG_NUM] = {
> LM90_REG_W_LOCAL_LOW,
> LM90_REG_W_LOCAL_HIGH,
> LM90_REG_W_LOCAL_CRIT,
> @@ -834,7 +877,7 @@ static void write_temp11(struct device *dev, int nr, int index, long val)
> u8 high;
> u8 low;
> int channel;
> - } reg[5] = {
> + } reg[NR_NUM] = {
> { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
> { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
> { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
> @@ -925,11 +968,12 @@ static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
>
> mutex_lock(&data->update_lock);
> if (data->kind == adt7461)
> - temp = temp_from_u8_adt7461(data, data->temp8[2]);
> + temp = temp_from_u8_adt7461(data,
> + data->temp8[TEMP8_LOCAL_CRIT]);
> else if (data->kind == max6646)
> - temp = temp_from_u8(data->temp8[2]);
> + temp = temp_from_u8(data->temp8[TEMP8_LOCAL_CRIT]);
> else
> - temp = temp_from_s8(data->temp8[2]);
> + temp = temp_from_s8(data->temp8[TEMP8_LOCAL_CRIT]);
>
> data->temp_hyst = hyst_to_reg(temp - val);
> i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
> @@ -983,25 +1027,28 @@ static ssize_t set_update_interval(struct device *dev,
> return count;
> }
>
> -static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL, 0, 4);
> -static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL, 0, 0);
> +static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL,
> + NR_CHAN_0_REMOTE_LOW, TEMP11_LOCAL_TEMP);
> +static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL,
> + NR_CHAN_0_REMOTE_LOW, TEMP11_REMOTE_TEMP);
> static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 0);
> + set_temp8, TEMP8_LOCAL_LOW);
> static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
> - set_temp11, 0, 1);
> + set_temp11, NR_CHAN_0_REMOTE_LOW, TEMP11_REMOTE_LOW);
> static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 1);
> + set_temp8, TEMP8_LOCAL_HIGH);
> static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
> - set_temp11, 1, 2);
> + set_temp11, NR_CHAN_0_REMOTE_HIGH, TEMP11_REMOTE_HIGH);
> static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 2);
> + set_temp8, TEMP8_LOCAL_CRIT);
> static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 3);
> + set_temp8, TEMP8_REMOTE_CRIT);
> static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
> - set_temphyst, 2);
> -static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3);
> + set_temphyst, TEMP8_LOCAL_CRIT);
> +static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL,
> + TEMP8_REMOTE_CRIT);
> static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
> - set_temp11, 2, 3);
> + set_temp11, NR_CHAN_0_REMOTE_OFFSET, TEMP11_REMOTE_OFFSET);
>
> /* Individual alarm files */
> static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
> @@ -1049,13 +1096,13 @@ static const struct attribute_group lm90_group = {
> * Additional attributes for devices with emergency sensors
> */
> static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 4);
> + set_temp8, TEMP8_LOCAL_EMERG);
> static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 5);
> + set_temp8, TEMP8_REMOTE_EMERG);
> static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
> - NULL, 4);
> + NULL, TEMP8_LOCAL_EMERG);
> static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
> - NULL, 5);
> + NULL, TEMP8_REMOTE_EMERG);
>
> static struct attribute *lm90_emergency_attributes[] = {
> &sensor_dev_attr_temp1_emergency.dev_attr.attr,
> @@ -1085,18 +1132,20 @@ static const struct attribute_group lm90_emergency_alarm_group = {
> /*
> * Additional attributes for devices with 3 temperature sensors
> */
> -static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL, 0, 5);
> +static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL,
> + NR_CHAN_0_REMOTE_LOW, TEMP11_REMOTE2_TEMP);
> static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
> - set_temp11, 3, 6);
> + set_temp11, NR_CHAN_1_REMOTE_LOW, TEMP11_REMOTE2_LOW);
> static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
> - set_temp11, 4, 7);
> + set_temp11, NR_CHAN_1_REMOTE_HIGH, TEMP11_REMOTE2_HIGH);
> static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 6);
> -static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL, 6);
> + set_temp8, TEMP8_REMOTE2_CRIT);
> +static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL,
> + TEMP8_REMOTE2_CRIT);
> static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
> - set_temp8, 7);
> + set_temp8, TEMP8_REMOTE2_EMERG);
> static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
> - NULL, 7);
> + NULL, TEMP8_REMOTE2_EMERG);
>
> static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
> static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
> --
> 1.7.9.5
>
>
--
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