This introduces a command to set parameters for a pwm device. Signed-off-by: Marc Reilly <marc@xxxxxxxxxxxxxxx> --- commands/Kconfig | 11 +++++ commands/Makefile | 1 + commands/pwm.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 123 insertions(+) create mode 100644 commands/pwm.c diff --git a/commands/Kconfig b/commands/Kconfig index 4d3ff631a8..6b7d0bfd79 100644 --- a/commands/Kconfig +++ b/commands/Kconfig @@ -1929,6 +1929,17 @@ config CMD_I2C -w use word (16 bit) wide access -v verbose + +config CMD_PWM + bool + depends on PWM + prompt "PWM commands: pwm_set" + help + pwm_set - set pwm state + + Usage: i2c_set - set pwm parameters + + config CMD_LED bool depends on LED diff --git a/commands/Makefile b/commands/Makefile index 98625a0373..011ae59427 100644 --- a/commands/Makefile +++ b/commands/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_CMD_GPIO) += gpio.o obj-$(CONFIG_CMD_UNCOMPRESS) += uncompress.o obj-$(CONFIG_CMD_I2C) += i2c.o obj-$(CONFIG_CMD_SPI) += spi.o +obj-$(CONFIG_CMD_PWM) += pwm.o obj-$(CONFIG_CMD_MIPI_DBI) += mipi_dbi.o obj-$(CONFIG_CMD_UBI) += ubi.o obj-$(CONFIG_CMD_UBIFORMAT) += ubiformat.o diff --git a/commands/pwm.c b/commands/pwm.c new file mode 100644 index 0000000000..8a26430e19 --- /dev/null +++ b/commands/pwm.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// SPDX-FileCopyrightText: © 2023 Marc Reilly <marc@xxxxxxxxxxxxxxx> + +/* pwm - pwm commands */ + +#include <common.h> +#include <command.h> +#include <errno.h> +#include <malloc.h> +#include <getopt.h> +#include <pwm.h> + +#define HZ_TO_NANOSECONDS(x) (1000000000UL/(x)) + +static int do_pwm_set(int argc, char *argv[]) +{ + struct pwm_device *pwm = NULL; + struct pwm_state state; + int error = 0; + char namebuf[128]; + char *devname = NULL; + int n = -1, polarity = -1, duty = -1, period = -1, freq = -1, opt; + + while ((opt = getopt(argc, argv, "n:d:D:P:f:i:")) > 0) { + switch (opt) { + case 'n': + n = simple_strtol(optarg, NULL, 0); + break; + case 'd': + devname = optarg; + break; + case 'D': + duty = simple_strtol(optarg, NULL, 0); + break; + case 'P': + period = simple_strtol(optarg, NULL, 0); + break; + case 'f': + freq = simple_strtol(optarg, NULL, 0); + break; + case 'i': + polarity = simple_strtol(optarg, NULL, 0); + break; + } + } + + if ((n < 0) && !devname) { + printf(" need to specify a device\n"); + return COMMAND_ERROR_USAGE; + } + if ((freq < 0) && (duty < 0) && (period < 0)) { + printf(" need to know some timing info; freq or dury/period\n"); + return COMMAND_ERROR_USAGE; + } + + if (!devname) { + sprintf(namebuf, "pwm%d", n); + } else { + strcpy(namebuf, devname); + } + + pwm = pwm_request(namebuf); + if (!pwm) { + printf("pwm device %s not found\n", namebuf); + return -ENODEV; + } + + pwm_get_state(pwm, &state); + if (polarity >= 0) + state.polarity = polarity; + + if (freq > 0) { + state.p_enable = true; + state.period_ns = HZ_TO_NANOSECONDS(freq); + pwm_set_relative_duty_cycle(&state, 50, 100); + } else if (duty > 0) { + state.p_enable = true; + state.period_ns = period; + state.duty_ns = duty; + } else { + state.p_enable = false; + } + + error = pwm_apply_state(pwm, &state); + + pwm_free(pwm); + + return error; +} + +BAREBOX_CMD_HELP_START(pwm_read) +BAREBOX_CMD_HELP_TEXT("Sets a pwm device parameters.") +BAREBOX_CMD_HELP_TEXT(" Specify the device either by device name or pwm number") +BAREBOX_CMD_HELP_TEXT(" Timings can either be specified via period + duty (on) duration,") +BAREBOX_CMD_HELP_TEXT(" or via frequency.") +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT("-d number\t", "device name (eg 'pwm0')") +BAREBOX_CMD_HELP_OPT("-n number\t", "pwm chip number (default 0)") +BAREBOX_CMD_HELP_OPT("-D number\t", "duty cycle (ns)") +BAREBOX_CMD_HELP_OPT("-P number\t", "period (ns)") +BAREBOX_CMD_HELP_OPT("-f number\t", "frequency (Hz)") +BAREBOX_CMD_HELP_OPT("-i number\t", "line inverted polarity") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(pwm_set) + .cmd = do_pwm_set, + BAREBOX_CMD_DESC("set pwm") + BAREBOX_CMD_OPTS("[-dnDPfp]") + BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP) + BAREBOX_CMD_HELP(cmd_pwm_read_help) +BAREBOX_CMD_END -- 2.35.3