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Message-ID: <20131030164113.1396964e@endymion.delvare>
Date: Wed, 30 Oct 2013 16:41:13 +0100
From: Jean Delvare <khali@...ux-fr.org>
To: Wei Ni <wni@...dia.com>
Cc: <linux@...ck-us.net>, <lm-sensors@...sensors.org>,
<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] hwmon: (lm90) Define status bits
Hi Wei,
On Wed, 7 Aug 2013 14:18:24 +0800, Wei Ni wrote:
> Add bit defines for the status register. And add a function
> lm90_is_tripped() which will read status register and return
> tripped or not, then lm90_alert can call it directly, and in the
> future the IRQ thread also can use it.
>
> Signed-off-by: Wei Ni <wni@...dia.com>
> ---
> drivers/hwmon/lm90.c | 75 +++++++++++++++++++++++++++++++++-----------------
> 1 file changed, 50 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> index cdff742..1da2eff 100644
> --- a/drivers/hwmon/lm90.c
> +++ b/drivers/hwmon/lm90.c
> @@ -179,6 +179,18 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
> #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
> #define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
>
> +/* LM90 status */
> +#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
> +#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
> +#define LM90_STATUS_OPEN (1 << 2) /* remote is an open circuit */
> +#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
> +#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
> +#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
> +#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
> +
> +#define MAX6696_STATUS2_RLOW (1 << 3) /* remote2 low temp limit tripped */
> +#define MAX6696_STATUS2_RHIGH (1 << 4) /* remote2 high temp limit tripped */
> +
> /*
> * Driver data (common to all clients)
> */
> @@ -1391,6 +1403,36 @@ static void lm90_init_client(struct i2c_client *client)
> i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
> }
>
> +static bool lm90_is_tripped(struct i2c_client *client)
> +{
> + struct lm90_data *data = i2c_get_clientdata(client);
> + u8 status, status2 = 0;
> +
> + lm90_read_reg(client, LM90_REG_R_STATUS, &status);
> +
> + if (data->kind == max6696)
> + lm90_read_reg(client, MAX6696_REG_R_STATUS2, &status2);
> +
> + if ((status & 0x7f) == 0 && (status2 & 0xfe) == 0)
> + return false;
> +
> + if (status & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM))
> + dev_warn(&client->dev,
> + "temp%d out of range, please check!\n", 1);
> + if (status & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM))
> + dev_warn(&client->dev,
> + "temp%d out of range, please check!\n", 2);
> + if (status & LM90_STATUS_OPEN)
> + dev_warn(&client->dev,
> + "temp%d diode open, please check!\n", 2);
> +
> + if (status2 & (MAX6696_STATUS2_RLOW | MAX6696_STATUS2_RHIGH))
> + dev_warn(&client->dev,
> + "temp%d out of range, please check!\n", 3);
> +
> + return true;
> +}
> +
> static int lm90_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -1489,36 +1531,17 @@ static int lm90_remove(struct i2c_client *client)
>
> static void lm90_alert(struct i2c_client *client, unsigned int flag)
> {
> - struct lm90_data *data = i2c_get_clientdata(client);
> - u8 config, alarms, alarms2 = 0;
> -
> - lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
> -
> - if (data->kind == max6696)
> - lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
> -
> - if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
> - dev_info(&client->dev, "Everything OK\n");
> - } else {
> - if (alarms & 0x61)
> - dev_warn(&client->dev,
> - "temp%d out of range, please check!\n", 1);
> - if (alarms & 0x1a)
> - dev_warn(&client->dev,
> - "temp%d out of range, please check!\n", 2);
> - if (alarms & 0x04)
> - dev_warn(&client->dev,
> - "temp%d diode open, please check!\n", 2);
> -
> - if (alarms2 & 0x18)
> - dev_warn(&client->dev,
> - "temp%d out of range, please check!\n", 3);
> -
> + if (lm90_is_tripped(client)) {
You are reading LM90_REG_R_STATUS here...
> /*
> * Disable ALERT# output, because these chips don't implement
> * SMBus alert correctly; they should only hold the alert line
> * low briefly.
> */
> + struct lm90_data *data = i2c_get_clientdata(client);
> + u8 config, alarms;
> +
> + lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
... and here again. I already complained about this in my previous
review of this patch, and you were supposed to address it, but you did
not. As a result I am still not happy with this patch and I can't apply
it, sorry.
> +
> if ((data->flags & LM90_HAVE_BROKEN_ALERT)
> && (alarms & data->alert_alarms)) {
> dev_dbg(&client->dev, "Disabling ALERT#\n");
> @@ -1526,6 +1549,8 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
> i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
> config | 0x80);
> }
> + } else {
> + dev_info(&client->dev, "Everything OK\n");
> }
> }
>
--
Jean Delvare
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