Added PMW3320 driver (#19543)

drivers/sensors/pmw3320.h

@@ -0,0 +1,119 @@
+/* Copyright 2021 Colin Lam (Ploopy Corporation)
+ * Copyright 2020 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+ * Copyright 2019 Sunjun Kim
+ * Copyright 2019 Hiroyuki Okada
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define constrain(amt, low, high) ((amt) < (low) ? (low) : ((amt) > (high) ? (high) : (amt)))
+
+// Definitions for the PMW3320 serial line.
+#ifndef PMW3320_SCLK_PIN
+#    ifdef POINTING_DEVICE_SCLK_PIN
+#        define PMW3320_SCLK_PIN POINTING_DEVICE_SCLK_PIN
+#    else
+#        error "No clock pin defined -- missing POINTING_DEVICE_SCLK_PIN or PMW3320_SCLK_PIN"
+#    endif
+#endif
+
+#ifndef PMW3320_SDIO_PIN
+#    ifdef POINTING_DEVICE_SDIO_PIN
+#        define PMW3320_SDIO_PIN POINTING_DEVICE_SDIO_PIN
+#    else
+#        error "No data pin defined -- missing POINTING_DEVICE_SDIO_PIN or PMW3320_SDIO_PIN"
+#    endif
+#endif
+
+#ifndef PMW3320_CS_PIN
+#    ifdef POINTING_DEVICE_CS_PIN
+#        define PMW3320_CS_PIN POINTING_DEVICE_CS_PIN
+#    else
+#        error "No chip select pin defined -- missing POINTING_DEVICE_CS_PIN or PMW3320_CS_PIN define"
+#    endif
+#endif
+
+typedef struct {
+    int8_t dx;
+    int8_t dy;
+} report_pmw3320_t;
+
+// A bunch of functions to implement the PMW3320-specific serial protocol.
+// Mostly taken from ADNS5050 driver.
+// Note that the "serial.h" driver is insufficient, because it does not
+// manually manipulate a serial clock signal.
+void             pmw3320_init(void);
+void             pmw3320_sync(void);
+uint8_t          pmw3320_serial_read(void);
+void             pmw3320_serial_write(uint8_t data);
+uint8_t          pmw3320_read_reg(uint8_t reg_addr);
+void             pmw3320_write_reg(uint8_t reg_addr, uint8_t data);
+report_pmw3320_t pmw3320_read_burst(void);
+void             pmw3320_set_cpi(uint16_t cpi);
+uint16_t         pmw3320_get_cpi(void);
+int8_t           convert_twoscomp(uint8_t data);
+bool             pmw3320_check_signature(void);
+
+#if !defined(PMW3320_CPI)
+#    define PMW3320_CPI 1000
+#endif
+
+#define PMW3320_CPI_STEP 250
+#define PMW3320_CPI_MIN 250
+#define PMW3320_CPI_MAX 3500
+
+// PMW3320 register addresses
+// clang-format off
+#define REG_Product_ID                 0x00
+#define REG_Revision_ID                0x01
+#define REG_Motion                     0x02
+#define REG_Delta_X                    0x03
+#define REG_Delta_Y                    0x04
+#define REG_SQUAL                      0x05
+#define REG_Shutter_Upper              0x06
+#define REG_Shutter_Lower              0x07
+#define REG_Maximum_Pixel              0x08
+#define REG_Pixel_Accum                0x09
+#define REG_Minimum_Pixel              0x0a
+#define REG_Pixel_Grab                 0x0b
+#define REG_Delta_XY                   0x0c
+#define REG_Resolution                 0x0d
+#define REG_Run_Downshift              0x0e
+#define REG_Rest1_Period               0x0f
+#define REG_Rest1_Downshift            0x10
+#define REG_Rest2_Preiod               0x11
+#define REG_Rest2_Downshift            0x12
+#define REG_Rest3_Period               0x13
+#define REG_Min_SQ_Run                 0x17
+#define REG_Axis_Control               0x1a
+#define REG_Performance                0x22
+#define REG_Low_Motion_Jitter          0x23
+#define REG_Shutter_Max_HI             0x36
+#define REG_Shutter_Max_LO             0x37
+#define REG_Frame_Rate                 0x39
+#define REG_Power_Up_Reset             0x3a
+#define REG_Shutdown                   0x3b
+#define REG_Inverse_Revision_ID        0x3f
+#define REG_Led_Control                0x40
+#define REG_Motion_Control             0x41
+#define REG_Burst_Read_First           0x42
+#define REG_Rest_Mode_Status           0x45
+#define REG_Inverse_Product_ID         0x4f
+#define REG_Motion_Burst               0x63
+// clang-format on