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

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On 2024/4/11 19:02, Dmitry Baryshkov wrote:
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.

Are you suggesting to add a flag in pm8xxx_vib as a discriminator for the new generation? I actually tried to avoid that because of this comment:
https://lore.kernel.org/linux-arm-msm/ZgXSBiQcBEbwF060@xxxxxxxxxx/#t

+       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








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