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Message-ID: <c3c66cff6b712ff38fa56af0c99d8956974a7b6c.camel@gmail.com>
Date: Wed, 21 Feb 2024 14:12:58 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Dumitru Ceclan <mitrutzceclan@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron
<jic23@...nel.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Ceclan Dumitru <dumitru.ceclan@...log.com>
Subject: Re: [PATCH v5 3/5] iio: amplifiers: hmc425a: move conversion logic
On Tue, 2024-02-20 at 17:34 +0200, Dumitru Ceclan wrote:
> Move gain-dB<->code conversion logic from read_raw and write_raw to
> chip_info callbacks.
>
> Signed-off-by: Dumitru Ceclan <mitrutzceclan@...il.com>
> ---
Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> drivers/iio/amplifiers/hmc425a.c | 126 ++++++++++++++++++++-----------
> 1 file changed, 83 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/iio/amplifiers/hmc425a.c b/drivers/iio/amplifiers/hmc425a.c
> index ed4d72922696..13e018a59637 100644
> --- a/drivers/iio/amplifiers/hmc425a.c
> +++ b/drivers/iio/amplifiers/hmc425a.c
> @@ -34,6 +34,9 @@ struct hmc425a_chip_info {
> int gain_min;
> int gain_max;
> int default_gain;
> +
> + int (*gain_dB_to_code)(int gain, int *code);
> + int (*code_to_gain_dB)(int code, int *val, int
> *val2);
> };
>
> struct hmc425a_state {
> @@ -44,6 +47,74 @@ struct hmc425a_state {
> u32 gain;
> };
>
> +static int gain_dB_to_code(struct hmc425a_state *st, int val, int val2, int *code)
> +{
> + struct hmc425a_chip_info *inf = st->chip_info;
> + int gain;
> +
> + if (val < 0)
> + gain = (val * 1000) - (val2 / 1000);
> + else
> + gain = (val * 1000) + (val2 / 1000);
> +
> + if (gain > inf->gain_max || gain < inf->gain_min)
> + return -EINVAL;
> +
> + return st->chip_info->gain_dB_to_code(gain, code);
> +}
> +
> +static int hmc425a_gain_dB_to_code(int gain, int *code)
> +{
> + *code = ~((abs(gain) / 500) & 0x3F);
> + return 0;
> +}
> +
> +static int hmc540s_gain_dB_to_code(int gain, int *code)
> +{
> + *code = ~((abs(gain) / 1000) & 0xF);
> + return 0;
> +}
> +
> +static int adrf5740_gain_dB_to_code(int gain, int *code)
> +{
> + int temp = (abs(gain) / 2000) & 0xF;
> +
> + /* Bit [0-3]: 2dB 4dB 8dB 8dB */
> + *code = temp & BIT(3) ? temp | BIT(2) : temp;
> + return 0;
> +}
> +
> +static int code_to_gain_dB(struct hmc425a_state *st, int *val, int *val2)
> +{
> + return st->chip_info->code_to_gain_dB(st->gain, val, val2);
> +}
> +
> +static int hmc425a_code_to_gain_dB(int code, int *val, int *val2)
> +{
> + *val = (~code * -500) / 1000;
> + *val2 = ((~code * -500) % 1000) * 1000;
> + return 0;
> +}
> +
> +static int hmc540s_code_to_gain_dB(int code, int *val, int *val2)
> +{
> + *val = (~code * -1000) / 1000;
> + *val2 = ((~code * -1000) % 1000) * 1000;
> + return 0;
> +}
> +
> +static int adrf5740_code_to_gain_dB(int code, int *val, int *val2)
> +{
> + /*
> + * Bit [0-3]: 2dB 4dB 8dB 8dB
> + * When BIT(3) is set, unset BIT(2) and use 3 as double the place value
> + */
> + code = code & BIT(3) ? code & ~BIT(2) : code;
> + *val = (code * -2000) / 1000;
> + *val2 = ((code * -2000) % 1000) * 1000;
> + return 0;
> +}
> +
> static int hmc425a_write(struct iio_dev *indio_dev, u32 value)
> {
> struct hmc425a_state *st = iio_priv(indio_dev);
> @@ -61,30 +132,14 @@ static int hmc425a_read_raw(struct iio_dev *indio_dev,
> int *val2, long m)
> {
> struct hmc425a_state *st = iio_priv(indio_dev);
> - int code, gain = 0;
> int ret;
>
> mutex_lock(&st->lock);
> switch (m) {
> case IIO_CHAN_INFO_HARDWAREGAIN:
> - code = st->gain;
> -
> - switch (st->type) {
> - case ID_HMC425A:
> - gain = ~code * -500;
> - break;
> - case ID_HMC540S:
> - gain = ~code * -1000;
> + ret = code_to_gain_dB(st, val, val2);
> + if (ret)
> break;
> - case ID_ADRF5740:
> - code = code & BIT(3) ? code & ~BIT(2) : code;
> - gain = code * -2000;
> - break;
> - }
> -
> - *val = gain / 1000;
> - *val2 = (gain % 1000) * 1000;
> -
> ret = IIO_VAL_INT_PLUS_MICRO_DB;
> break;
> default:
> @@ -100,36 +155,15 @@ static int hmc425a_write_raw(struct iio_dev *indio_dev,
> int val2, long mask)
> {
> struct hmc425a_state *st = iio_priv(indio_dev);
> - struct hmc425a_chip_info *inf = st->chip_info;
> - int code = 0, gain;
> - int ret;
> -
> - if (val < 0)
> - gain = (val * 1000) - (val2 / 1000);
> - else
> - gain = (val * 1000) + (val2 / 1000);
> -
> - if (gain > inf->gain_max || gain < inf->gain_min)
> - return -EINVAL;
> -
> - switch (st->type) {
> - case ID_HMC425A:
> - code = ~((abs(gain) / 500) & 0x3F);
> - break;
> - case ID_HMC540S:
> - code = ~((abs(gain) / 1000) & 0xF);
> - break;
> - case ID_ADRF5740:
> - code = (abs(gain) / 2000) & 0xF;
> - code = code & BIT(3) ? code | BIT(2) : code;
> - break;
> - }
> + int code = 0, ret;
>
> mutex_lock(&st->lock);
> switch (mask) {
> case IIO_CHAN_INFO_HARDWAREGAIN:
> + ret = gain_dB_to_code(st, val, val2, &code);
> + if (ret)
> + break;
> st->gain = code;
> -
> ret = hmc425a_write(indio_dev, st->gain);
> break;
> default:
> @@ -189,6 +223,8 @@ static struct hmc425a_chip_info hmc425a_chip_info_tbl[] = {
> .gain_min = -31500,
> .gain_max = 0,
> .default_gain = -0x40, /* set default gain -31.5db*/
> + .gain_dB_to_code = hmc425a_gain_dB_to_code,
> + .code_to_gain_dB = hmc425a_code_to_gain_dB,
> },
> [ID_HMC540S] = {
> .name = "hmc540s",
> @@ -198,6 +234,8 @@ static struct hmc425a_chip_info hmc425a_chip_info_tbl[] = {
> .gain_min = -15000,
> .gain_max = 0,
> .default_gain = -0x10, /* set default gain -15.0db*/
> + .gain_dB_to_code = hmc540s_gain_dB_to_code,
> + .code_to_gain_dB = hmc540s_code_to_gain_dB,
> },
> [ID_ADRF5740] = {
> .name = "adrf5740",
> @@ -207,6 +245,8 @@ static struct hmc425a_chip_info hmc425a_chip_info_tbl[] = {
> .gain_min = -22000,
> .gain_max = 0,
> .default_gain = 0xF, /* set default gain -22.0db*/
> + .gain_dB_to_code = adrf5740_gain_dB_to_code,
> + .code_to_gain_dB = adrf5740_code_to_gain_dB,
> },
> };
>
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