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misc: Add ws2812-pio-rp1 driver
ws2812-pio-rp1 is a PIO-based driver for WS2812 LEDS. It creates a character device in /dev, the default name of which is /dev/leds<n>, where <n> is the instance number. The number of LEDS should be set in the DT overlay, as should whether it is RGB or RGBW, and the default brightness. Write data to the /dev/* entry in a 4 bytes-per-pixel format in RGBW order: RR GG BB WW RR GG BB WW ... The white values are ignored unless the rgbw flag is set for the device. To change the brightness, write a single byte to offset 0, 255 being full brightness and 0 being off. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
Dom Cobley
@@ -25,6 +25,16 @@ config RP1_PIO
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Driver providing control of the Raspberry Pi PIO block, as found in
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RP1.
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config WS2812_PIO_RP1
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tristate "Raspberry Pi PIO-base WS2812 driver"
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depends on RP1_PIO || COMPILE_TEST
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default n
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help
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Driver for the WS2812 (NeoPixel) LEDs using the RP1 PIO hardware.
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The driver creates a character device to which rgbw pixels may be
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written. Single-byte writes to offset 0 set the brightness at
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runtime.
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config AD525X_DPOT
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tristate "Analog Devices Digital Potentiometers"
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depends on (I2C || SPI) && SYSFS
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@@ -21,6 +21,7 @@ obj-$(CONFIG_RPMB) += rpmb-core.o
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obj-$(CONFIG_QCOM_COINCELL) += qcom-coincell.o
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obj-$(CONFIG_QCOM_FASTRPC) += fastrpc.o
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obj-$(CONFIG_RP1_PIO) += rp1-pio.o
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obj-$(CONFIG_WS2812_PIO_RP1) += ws2812-pio-rp1.o
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obj-$(CONFIG_SENSORS_BH1770) += bh1770glc.o
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obj-$(CONFIG_SENSORS_APDS990X) += apds990x.o
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obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
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507
drivers/misc/ws2812-pio-rp1.c
Normal file
507
drivers/misc/ws2812-pio-rp1.c
Normal file
@@ -0,0 +1,507 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Raspberry Pi PIO-based WS2812 driver
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*
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* Copyright (C) 2014-2024 Raspberry Pi Ltd.
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*
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* Author: Phil Elwell (phil@raspberrypi.com)
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*
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* Based on the ws2812 driver by Gordon Hollingworth <gordon@raspberrypi.com>
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*/
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#include <linux/cdev.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fcntl.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/pio_rp1.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/gpio/consumer.h>
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#define DRIVER_NAME "ws2812-pio-rp1"
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#define MAX_INSTANCES 4
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#define RESET_US 50
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#define PIXEL_BYTES 4
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struct ws2812_pio_rp1_state {
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struct device *dev;
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struct gpio_desc *gpiod;
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struct gpio_desc *power_gpiod;
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uint gpio;
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PIO pio;
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uint sm;
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uint offset;
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u8 *buffer;
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u8 *pixbuf;
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u32 pixbuf_size;
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u32 write_end;
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u8 brightness;
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u32 invert;
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u32 num_leds;
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u32 xfer_end_us;
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bool is_rgbw;
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struct delayed_work deferred_work;
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struct completion dma_completion;
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struct cdev cdev;
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dev_t dev_num;
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const char *dev_name;
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};
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static DEFINE_MUTEX(ws2812_pio_mutex);
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static DEFINE_IDA(ws2812_pio_ida);
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static long ws2812_pio_ref_count;
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static struct class *ws2812_pio_class;
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static dev_t ws2812_pio_dev_num;
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/*
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* WS2812B gamma correction
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* GammaE=255*(res/255).^(1/.45)
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* From: http://rgb-123.com/ws2812-color-output/
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*/
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static const u8 ws2812_gamma[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,
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2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5,
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6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11,
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11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18,
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19, 19, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28,
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29, 29, 30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 37, 38, 39, 40,
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40, 41, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54,
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55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70,
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71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 83, 84, 85, 86, 88, 89,
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90, 91, 93, 94, 95, 96, 98, 99, 100, 102, 103, 104, 106, 107, 109, 110,
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111, 113, 114, 116, 117, 119, 120, 121, 123, 124, 126, 128, 129, 131, 132, 134,
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135, 137, 138, 140, 142, 143, 145, 146, 148, 150, 151, 153, 155, 157, 158, 160,
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162, 163, 165, 167, 169, 170, 172, 174, 176, 178, 179, 181, 183, 185, 187, 189,
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191, 193, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220,
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222, 224, 227, 229, 231, 233, 235, 237, 239, 241, 244, 246, 248, 250, 252, 255
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};
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// ------ //
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// ws2812 //
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// ------ //
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#define ws2812_wrap_target 0
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#define ws2812_wrap 3
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#define ws2812_T1 3
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#define ws2812_T2 4
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#define ws2812_T3 3
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static const uint16_t ws2812_program_instructions[] = {
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// .wrap_target
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0x6221, // 0: out x, 1 side 0 [2]
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0x1223, // 1: jmp !x, 3 side 1 [2]
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0x1300, // 2: jmp 0 side 1 [3]
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0xa342, // 3: nop side 0 [3]
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// .wrap
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};
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static const struct pio_program ws2812_program = {
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.instructions = ws2812_program_instructions,
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.length = 4,
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.origin = -1,
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};
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static inline pio_sm_config ws2812_program_get_default_config(uint offset)
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{
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, offset + ws2812_wrap_target, offset + ws2812_wrap);
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sm_config_set_sideset(&c, 1, false, false);
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return c;
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}
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static inline void ws2812_program_init(PIO pio, uint sm, uint offset, uint pin, uint freq,
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bool rgbw)
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{
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int cycles_per_bit = ws2812_T1 + ws2812_T2 + ws2812_T3;
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struct fp24_8 div;
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pio_sm_config c;
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pio_gpio_init(pio, pin);
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pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
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c = ws2812_program_get_default_config(offset);
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sm_config_set_sideset_pins(&c, pin);
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sm_config_set_out_shift(&c, false, true, rgbw ? 32 : 24);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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div = make_fp24_8(clock_get_hz(clk_sys), freq * cycles_per_bit);
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sm_config_set_clkdiv(&c, div);
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pio_sm_init(pio, sm, offset, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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static uint8_t ws2812_apply_gamma(uint8_t brightness, uint8_t val)
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{
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int bright;
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if (!val)
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return 0;
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bright = (val * brightness) / 255;
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return ws2812_gamma[bright];
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}
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static inline uint8_t *rgbw_u32(const struct ws2812_pio_rp1_state *state,
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uint8_t r, uint8_t g, uint8_t b, uint8_t w, uint8_t *p)
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{
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p[0] = ws2812_apply_gamma(state->brightness, w);
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p[1] = ws2812_apply_gamma(state->brightness, b);
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p[2] = ws2812_apply_gamma(state->brightness, r);
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p[3] = ws2812_apply_gamma(state->brightness, g);
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return p + 4;
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}
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static void ws2812_dma_complete(void *param)
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{
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struct ws2812_pio_rp1_state *state = param;
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complete(&state->dma_completion);
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}
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static void ws2812_update_leds(struct ws2812_pio_rp1_state *state, uint length)
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{
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init_completion(&state->dma_completion);
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if (!pio_sm_xfer_data(state->pio, state->sm, PIO_DIR_TO_SM, length, state->buffer, 0,
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(void (*)(void *))ws2812_dma_complete, state)) {
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wait_for_completion(&state->dma_completion);
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usleep_range(RESET_US, RESET_US + 100);
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}
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}
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static void ws2812_clear_leds(struct ws2812_pio_rp1_state *state)
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{
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uint8_t *p_buffer;
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uint length;
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int i;
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p_buffer = state->buffer;
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for (i = 0; i < state->num_leds; i++)
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p_buffer = rgbw_u32(state, 0, 0, 0, 0, p_buffer);
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length = (void *)p_buffer - (void *)state->buffer;
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ws2812_update_leds(state, length);
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}
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/*
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* Function to write the RGB buffer to the WS2812 leds, the input buffer
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* contains a sequence of up to num_leds RGB32 integers, these are then
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* gamma-corrected before being sent to the PIO state machine.
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*/
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static ssize_t ws2812_pio_rp1_write(struct file *filp, const char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct ws2812_pio_rp1_state *state;
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uint32_t pixbuf_size;
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unsigned long delay;
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loff_t pos = *ppos;
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int err = 0;
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state = (struct ws2812_pio_rp1_state *)filp->private_data;
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pixbuf_size = state->pixbuf_size;
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if (pos > pixbuf_size)
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return -EFBIG;
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if (count > pixbuf_size) {
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err = -EFBIG;
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count = pixbuf_size;
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}
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if (pos + count > pixbuf_size) {
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if (!err)
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err = -ENOSPC;
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count = pixbuf_size - pos;
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}
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if (!pos && count == 1) {
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if (copy_from_user(&state->brightness, buf, 1))
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return -EFAULT;
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} else {
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if (copy_from_user(state->pixbuf + pos, buf, count))
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return -EFAULT;
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pos += count;
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state->write_end = (u32)pos;
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}
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*ppos = pos;
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delay = (state->write_end == pixbuf_size) ? 0 : HZ / 20;
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schedule_delayed_work(&state->deferred_work, delay);
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return err ? err : count;
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}
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static void ws2812_pio_rp1_deferred_work(struct work_struct *work)
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{
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struct ws2812_pio_rp1_state *state =
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container_of(work, struct ws2812_pio_rp1_state, deferred_work.work);
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uint8_t *p_buffer;
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uint32_t *p_rgb;
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int blank_bytes;
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uint length;
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int i;
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blank_bytes = state->pixbuf_size - state->write_end;
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if (blank_bytes > 0)
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memset(state->pixbuf + state->write_end, 0, blank_bytes);
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p_rgb = (uint32_t *)state->pixbuf;
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p_buffer = state->buffer;
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for (i = 0; i < state->num_leds; i++) {
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uint32_t rgbw_pix = *(p_rgb++);
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p_buffer = rgbw_u32(state,
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(uint8_t)(rgbw_pix >> 0),
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(uint8_t)(rgbw_pix >> 8),
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(uint8_t)(rgbw_pix >> 16),
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(uint8_t)(rgbw_pix >> 24),
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p_buffer);
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}
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length = (void *)p_buffer - (void *)state->buffer;
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ws2812_update_leds(state, length);
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}
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static int ws2812_pio_rp1_open(struct inode *inode, struct file *file)
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{
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struct ws2812_pio_rp1_state *state;
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state = container_of(inode->i_cdev, struct ws2812_pio_rp1_state, cdev);
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file->private_data = state;
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return 0;
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}
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const struct file_operations ws2812_pio_rp1_fops = {
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.owner = THIS_MODULE,
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.write = ws2812_pio_rp1_write,
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.open = ws2812_pio_rp1_open,
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};
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/*
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* Probe function
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*/
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static int ws2812_pio_rp1_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct of_phandle_args of_args = { 0 };
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struct ws2812_pio_rp1_state *state;
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struct device *dev = &pdev->dev;
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struct device *char_dev;
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const char *dev_name;
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uint32_t brightness;
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bool is_rp1;
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int minor;
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int ret;
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state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
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if (IS_ERR(state))
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return PTR_ERR(state);
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state->dev = dev;
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platform_set_drvdata(pdev, state);
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ret = of_property_read_u32(np, "rpi,num-leds", &state->num_leds);
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if (ret)
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return dev_err_probe(dev, ret, "Could not get num-leds\n");
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brightness = 255;
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of_property_read_u32(np, "rpi,brightness", &brightness);
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state->brightness = min(brightness, 255);
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state->pixbuf_size = state->num_leds * PIXEL_BYTES;
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state->is_rgbw = of_property_read_bool(np, "rpi,rgbw");
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state->gpiod = devm_gpiod_get(dev, "leds", GPIOD_ASIS);
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if (IS_ERR(state->gpiod))
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return dev_err_probe(dev, PTR_ERR(state->gpiod),
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"Could not get a gpio\n");
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/* This must be an RP1 GPIO in the first bank, and retrieve the offset. */
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/* Unfortunately I think this has to be done by parsing the gpios property */
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/* This really shouldn't fail, given that we have a gpiod */
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if (of_parse_phandle_with_args(np, "leds-gpios", "#gpio-cells", 0, &of_args))
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return dev_err_probe(dev, -EINVAL,
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"Can't find gpio declaration\n");
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is_rp1 = of_device_is_compatible(of_args.np, "raspberrypi,rp1-gpio");
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of_node_put(of_args.np);
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if (!is_rp1 || of_args.args_count != 2)
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return dev_err_probe(dev, -EINVAL,
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"Not an RP1 gpio\n");
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state->gpio = of_args.args[0];
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state->pixbuf = devm_kmalloc(dev, state->pixbuf_size, GFP_KERNEL);
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if (state->pixbuf == NULL)
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return -ENOMEM;
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state->buffer = devm_kmalloc(dev, state->num_leds * PIXEL_BYTES, GFP_KERNEL);
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if (state->buffer == NULL)
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return -ENOMEM;
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ret = of_property_read_string(np, "dev-name", &dev_name);
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if (ret) {
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pr_err("Failed to read 'dev-name' property\n");
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return ret;
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}
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state->pio = pio_open();
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if (IS_ERR(state->pio))
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return dev_err_probe(dev, PTR_ERR(state->pio),
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"Could not open PIO\n");
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state->sm = pio_claim_unused_sm(state->pio, false);
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if ((int)state->sm < 0) {
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dev_err(dev, "No free PIO SM\n");
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ret = -EBUSY;
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goto fail_pio;
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}
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state->offset = pio_add_program(state->pio, &ws2812_program);
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if (state->offset == PIO_ORIGIN_ANY) {
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dev_err(dev, "Not enough PIO program space\n");
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ret = -EBUSY;
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goto fail_pio;
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}
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pio_sm_config_xfer(state->pio, state->sm, PIO_DIR_TO_SM, state->num_leds * sizeof(int), 1);
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pio_sm_clear_fifos(state->pio, state->sm);
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pio_sm_set_clkdiv(state->pio, state->sm, make_fp24_8(1, 1));
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ws2812_program_init(state->pio, state->sm, state->offset, state->gpio, 800000,
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state->is_rgbw);
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mutex_lock(&ws2812_pio_mutex);
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if (!ws2812_pio_ref_count) {
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ret = alloc_chrdev_region(&ws2812_pio_dev_num, 0, MAX_INSTANCES, DRIVER_NAME);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "alloc_chrdev_region failed (rc=%d)\n", ret);
|
||||
goto fail_mutex;
|
||||
}
|
||||
|
||||
ws2812_pio_class = class_create(DRIVER_NAME);
|
||||
if (IS_ERR(ws2812_pio_class)) {
|
||||
pr_err("Unable to create class " DRIVER_NAME "\n");
|
||||
ret = PTR_ERR(ws2812_pio_class);
|
||||
goto fail_chrdev;
|
||||
}
|
||||
}
|
||||
|
||||
ws2812_pio_ref_count++;
|
||||
|
||||
minor = ida_alloc_range(&ws2812_pio_ida, 0, MAX_INSTANCES - 1, GFP_KERNEL);
|
||||
if (minor < 0) {
|
||||
pr_err("No free instances\n");
|
||||
ret = minor;
|
||||
goto fail_class;
|
||||
|
||||
}
|
||||
|
||||
mutex_unlock(&ws2812_pio_mutex);
|
||||
|
||||
state->dev_num = MKDEV(MAJOR(ws2812_pio_dev_num), minor);
|
||||
state->dev_name = devm_kasprintf(dev, GFP_KERNEL, dev_name, minor);
|
||||
|
||||
char_dev = device_create(ws2812_pio_class, NULL, state->dev_num, NULL, state->dev_name);
|
||||
|
||||
if (IS_ERR(char_dev)) {
|
||||
pr_err("Unable to create device %s\n", state->dev_name);
|
||||
ret = PTR_ERR(char_dev);
|
||||
goto fail_ida;
|
||||
}
|
||||
|
||||
state->cdev.owner = THIS_MODULE;
|
||||
cdev_init(&state->cdev, &ws2812_pio_rp1_fops);
|
||||
|
||||
ret = cdev_add(&state->cdev, state->dev_num, 1);
|
||||
if (ret) {
|
||||
pr_err("cdev_add failed\n");
|
||||
goto fail_device;
|
||||
}
|
||||
|
||||
INIT_DELAYED_WORK(&state->deferred_work, ws2812_pio_rp1_deferred_work);
|
||||
|
||||
ws2812_clear_leds(state);
|
||||
|
||||
dev_info(&pdev->dev, "Instantiated %d LEDs on GPIO %d as /dev/%s\n",
|
||||
state->num_leds, state->gpio, state->dev_name);
|
||||
|
||||
return 0;
|
||||
|
||||
fail_device:
|
||||
device_destroy(ws2812_pio_class, state->dev_num);
|
||||
fail_ida:
|
||||
mutex_lock(&ws2812_pio_mutex);
|
||||
ida_free(&ws2812_pio_ida, minor);
|
||||
fail_class:
|
||||
ws2812_pio_ref_count--;
|
||||
if (ws2812_pio_ref_count)
|
||||
goto fail_mutex;
|
||||
class_destroy(ws2812_pio_class);
|
||||
fail_chrdev:
|
||||
unregister_chrdev_region(ws2812_pio_dev_num, MAX_INSTANCES);
|
||||
fail_mutex:
|
||||
mutex_unlock(&ws2812_pio_mutex);
|
||||
fail_pio:
|
||||
pio_close(state->pio);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void ws2812_pio_rp1_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ws2812_pio_rp1_state *state = platform_get_drvdata(pdev);
|
||||
|
||||
cancel_delayed_work(&state->deferred_work);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
cdev_del(&state->cdev);
|
||||
device_destroy(ws2812_pio_class, state->dev_num);
|
||||
|
||||
mutex_lock(&ws2812_pio_mutex);
|
||||
ida_free(&ws2812_pio_ida, MINOR(state->dev_num));
|
||||
ws2812_pio_ref_count--;
|
||||
if (!ws2812_pio_ref_count) {
|
||||
class_destroy(ws2812_pio_class);
|
||||
unregister_chrdev_region(ws2812_pio_dev_num, MAX_INSTANCES);
|
||||
}
|
||||
mutex_unlock(&ws2812_pio_mutex);
|
||||
|
||||
pio_close(state->pio);
|
||||
}
|
||||
|
||||
static const struct of_device_id ws2812_pio_rp1_match[] = {
|
||||
{ .compatible = "raspberrypi,ws2812-pio-rp1" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ws2812_pio_rp1_match);
|
||||
|
||||
static struct platform_driver ws2812_pio_rp1_driver = {
|
||||
.driver = {
|
||||
.name = "ws2812-pio-rp1",
|
||||
.of_match_table = ws2812_pio_rp1_match,
|
||||
},
|
||||
.probe = ws2812_pio_rp1_probe,
|
||||
.remove = ws2812_pio_rp1_remove,
|
||||
};
|
||||
module_platform_driver(ws2812_pio_rp1_driver);
|
||||
|
||||
MODULE_DESCRIPTION("WS2812 PIO RP1 driver");
|
||||
MODULE_AUTHOR("Phil Elwell");
|
||||
MODULE_LICENSE("GPL");
|
||||
Reference in New Issue
Block a user