Re: [PATCH v9 4/4] input: pm8xxx-vibrator: add new SPMI vibrator support

From: Dmitry Baryshkov
Date: Thu Apr 11 2024 - 07:02:48 EST

On Thu, 11 Apr 2024 at 11:32, Fenglin Wu via B4 Relay
<devnull+quic_fenglinw.quicinc.com@xxxxxxxxxx> wrote:
>
> From: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
>
> Add support for a new SPMI vibrator module which is very similar
> to the vibrator module inside PM8916 but has a finer drive voltage
> step and different output voltage range, its drive level control
> is expanded across 2 registers. The vibrator module can be found
> in following Qualcomm PMICs: PMI632, PM7250B, PM7325B, PM7550BA.
>
> Signed-off-by: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
> ---
> drivers/input/misc/pm8xxx-vibrator.c | 51 +++++++++++++++++++++++++++++-------
> 1 file changed, 42 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c
> index 2959edca8eb9..35bb6f450fd2 100644
> --- a/drivers/input/misc/pm8xxx-vibrator.c
> +++ b/drivers/input/misc/pm8xxx-vibrator.c
> @@ -12,10 +12,10 @@
> #include <linux/regmap.h>
> #include <linux/slab.h>
>
> -#define VIB_MAX_LEVEL_mV (3100)
> -#define VIB_MIN_LEVEL_mV (1200)
> -#define VIB_PER_STEP_mV (100)
> -#define VIB_MAX_LEVELS (VIB_MAX_LEVEL_mV - VIB_MIN_LEVEL_mV + VIB_PER_STEP_mV)
> +#define VIB_MAX_LEVEL_mV(vib) (vib->drv2_addr ? 3544 : 3100)
> +#define VIB_MIN_LEVEL_mV(vib) (vib->drv2_addr ? 1504 : 1200)
> +#define VIB_PER_STEP_mV(vib) (vib->drv2_addr ? 8 : 100)
> +#define VIB_MAX_LEVELS(vib) (VIB_MAX_LEVEL_mV(vib) - VIB_MIN_LEVEL_mV(vib) + VIB_PER_STEP_mV(vib))
>
> #define MAX_FF_SPEED 0xff
>
> @@ -26,6 +26,9 @@ struct pm8xxx_regs {
> unsigned int drv_offset;
> unsigned int drv_mask;
> unsigned int drv_shift;
> + unsigned int drv2_offset;
> + unsigned int drv2_mask;
> + unsigned int drv2_shift;
> unsigned int drv_en_manual_mask;
> };
>
> @@ -45,6 +48,18 @@ static struct pm8xxx_regs pm8916_regs = {
> .drv_en_manual_mask = 0,
> };
>
> +static struct pm8xxx_regs pmi632_regs = {
> + .enable_offset = 0x46,
> + .enable_mask = BIT(7),
> + .drv_offset = 0x40,
> + .drv_mask = GENMASK(7, 0),
> + .drv_shift = 0,
> + .drv2_offset = 0x41,
> + .drv2_mask = GENMASK(3, 0),
> + .drv2_shift = 8,
> + .drv_en_manual_mask = 0,
> +};
> +
> /**
> * struct pm8xxx_vib - structure to hold vibrator data
> * @vib_input_dev: input device supporting force feedback
> @@ -53,6 +68,7 @@ static struct pm8xxx_regs pm8916_regs = {
> * @regs: registers' info
> * @enable_addr: vibrator enable register
> * @drv_addr: vibrator drive strength register
> + * @drv2_addr: vibrator drive strength upper byte register
> * @speed: speed of vibration set from userland
> * @active: state of vibrator
> * @level: level of vibration to set in the chip
> @@ -65,6 +81,7 @@ struct pm8xxx_vib {
> const struct pm8xxx_regs *regs;
> unsigned int enable_addr;
> unsigned int drv_addr;
> + unsigned int drv2_addr;
> int speed;
> int level;
> bool active;
> @@ -82,6 +99,10 @@ static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
> unsigned int val = vib->reg_vib_drv;
> const struct pm8xxx_regs *regs = vib->regs;
>
> + /* vibrator without drv2_addr needs be programmed in step increments */

How are these two items related? Are you using vib->drv2_addr as a
marker for 'particular generation'? In such a case please use a flag
instead.

The rest looks good to me.

> + if (!vib->drv2_addr)
> + vib->level /= VIB_PER_STEP_mV(vib);
> +
> if (on)
> val |= (vib->level << regs->drv_shift) & regs->drv_mask;
> else
> @@ -93,6 +114,17 @@ static int pm8xxx_vib_set(struct pm8xxx_vib *vib, bool on)
>
> vib->reg_vib_drv = val;
>
> + if (regs->drv2_mask) {
> + if (on)
> + val = (vib->level << regs->drv2_shift) & regs->drv2_mask;
> + else
> + val = 0;
> +
> + rc = regmap_write_bits(vib->regmap, vib->drv2_addr, regs->drv2_mask, val);
> + if (rc < 0)
> + return rc;
> + }
> +
> if (regs->enable_mask)
> rc = regmap_update_bits(vib->regmap, vib->enable_addr,
> regs->enable_mask, on ? regs->enable_mask : 0);
> @@ -115,17 +147,16 @@ static void pm8xxx_work_handler(struct work_struct *work)
> return;
>
> /*
> - * pmic vibrator supports voltage ranges from 1.2 to 3.1V, so
> + * pmic vibrator supports voltage ranges from MIN_LEVEL to MAX_LEVEL, so
> * scale the level to fit into these ranges.
> */
> if (vib->speed) {
> vib->active = true;
> - vib->level = ((VIB_MAX_LEVELS * vib->speed) / MAX_FF_SPEED) +
> - VIB_MIN_LEVEL_mV;
> - vib->level /= VIB_PER_STEP_mV;
> + vib->level = VIB_MIN_LEVEL_mV(vib);
> + vib->level += mult_frac(VIB_MAX_LEVELS(vib), vib->speed, MAX_FF_SPEED);
> } else {
> vib->active = false;
> - vib->level = VIB_MIN_LEVEL_mV / VIB_PER_STEP_mV;
> + vib->level = VIB_MIN_LEVEL_mV(vib);
> }
>
> pm8xxx_vib_set(vib, vib->active);
> @@ -203,6 +234,7 @@ static int pm8xxx_vib_probe(struct platform_device *pdev)
>
> vib->enable_addr = reg_base + regs->enable_offset;
> vib->drv_addr = reg_base + regs->drv_offset;
> + vib->drv2_addr = reg_base + regs->drv2_offset;
>
> /* operate in manual mode */
> error = regmap_read(vib->regmap, vib->drv_addr, &val);
> @@ -257,6 +289,7 @@ static const struct of_device_id pm8xxx_vib_id_table[] = {
> { .compatible = "qcom,pm8058-vib", .data = &pm8058_regs },
> { .compatible = "qcom,pm8921-vib", .data = &pm8058_regs },
> { .compatible = "qcom,pm8916-vib", .data = &pm8916_regs },
> + { .compatible = "qcom,pmi632-vib", .data = &pmi632_regs },
> { }
> };
> MODULE_DEVICE_TABLE(of, pm8xxx_vib_id_table);
>
> --
> 2.25.1
>
>


--
With best wishes
Dmitry