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Mon, 29 May 2023 10:13:28 +1000 From: Marc Reilly To: barebox@lists.infradead.org Date: Mon, 29 May 2023 10:13:16 +1000 Message-Id: <20230529001318.12309-2-marc@cpdesign.com.au> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230529001318.12309-1-marc@cpdesign.com.au> References: <20230529001318.12309-1-marc@cpdesign.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authenticated-User: marc@cpdesign.com.au X-Authenticator: dovecot_plain X-Originating-IP: 116.90.56.28 X-SpamExperts-Domain: panthur-sh-outbound0.mailcluster.com.au X-SpamExperts-Username: 116.90.56.28 Authentication-Results: mailcluster.com.au; auth=pass smtp.auth=116.90.56.28@panthur-sh-outbound0.mailcluster.com.au X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: SB/global_tokens (0.00118816152694) X-Recommended-Action: accept X-Filter-ID: Pt3MvcO5N4iKaDQ5O6lkdGlMVN6RH8bjRMzItlySaT8rwqzY5xs5hZVNH77E3T2NPUtbdvnXkggZ 3YnVId/Y5jcf0yeVQAvfjHznO7+bT5zzRQC/PIR0ZeIYukWs6zeuXFWCX8oNdggW7HE9XDTdSavp k7Vp2UXVHEQMIct0liIKxcdJX7KJnBh/A9daJmPyswKQDamPN66SYe4XX4xmgJvmHZIaOCPnuqIf UsnKQndaIN+MTJ88TTpoG8fQ5knApuGXed8VjoeeEKguXydrkSpUidRDvhULdPLXIoXP6ZiGKpfT IF8fSxNC0LttVkKWP6j2wfkRtOTZOVnmAjcy5vsDcLC0U2KR6OWH3DJPpNlNxaypTbp28NxghjNo pU/Oaqj4KISIRSJ5MfjE8OaunZEyYYf7TmlI3iEcqXK4A61ChHMQHCMEWTX9HEhwSP4/MSl+mev0 M9cO0xP2892D0Uv5/hXXQF+f2WAemEBBH0NsVeB41VPmQWlT6X4HxPATd38b9MLKMY00g8iKb4Ma HkcFBAvuf345Nnfstl8j+xb35lDPKa+hEyOYER4dYqg19L79JWHANylAmdcW1ioqKAhIbSJTbn3p hW1N8stWViDDh0zYybFfFGb1BguKhGQS1815h2jfNCQvp3x+etU3v+gbaW5naTC7zOfGQeBlb2X7 4O4hBSz/kkmPgL+fgIgur9dszVORRxP/OPITy0dTWCZWuSDEMcDg0gVL7+IlOt4N364Wcpr2MDuB p3ptACQJedRzuhYq7fPAVaOBt7ccueYOGA1Wk/WtN7IlJDf9Woj30LCTI1bmgn6vkthdwyTiERWe KKG4PAQYNyavp7c49EgfN5fYYOq7L81CtUAj3rXGo3Q/9oimKNxPxcvU0i2uMA8MPbuO8ibR/ISR fVpDi45WsuLEDRPxxynsFmqi/H08CVsONrMJuGzuoGnKTKcyJWXFml3Sqrhyk7Sb5Ea22nINtdS0 83so84to/tKR8trLmS1dKo3/gyamuiQZna5TY55n2DScCep6TmiOal+G5AYPXmLT+R8trbdl14P2 LagrKqa7xZSqGU2f/59k1cSbWEwQPAv2fxf3s0iIhEk0CxL3FhyCT+8vOSJGHGnDZXwDpWlUp2+O /CsxsN//TNyP8Lec2Q0NUjSrr/sd1gA0n/sraetX349jJSUzpGrnppYxL7hrJSk60SF3F6RYOYr2 X-Report-Abuse-To: spam@vmse01.mailcluster.com.au X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230528_171509_791939_05A32853 X-CRM114-Status: GOOD ( 21.67 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 1/3] commands: add pwm manipulation command X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) This introduces a command to set parameters for a pwm device. Signed-off-by: Marc Reilly --- commands/Kconfig | 11 ++++ commands/Makefile | 1 + commands/pwm.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 commands/pwm.c diff --git a/commands/Kconfig b/commands/Kconfig index 4d3ff631a8..cc7585bbb2 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: pwm_set [dDPfwis] + + Controls the pwm values such as period and duty cycle + 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..a21b918c89 --- /dev/null +++ b/commands/pwm.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// SPDX-FileCopyrightText: © 2023 Marc Reilly + +/* pwm - pwm commands */ + +#include +#include +#include +#include +#include +#include + +#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 *devname = NULL; + int duty = -1, period = -1; + int freq = -1, width = -1; + int invert_polarity = -1, stop = -1; + int opt; + + while ((opt = getopt(argc, argv, "d:D:P:f:w:is")) > 0) { + switch (opt) { + 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 'w': + width = simple_strtol(optarg, NULL, 0); + break; + case 'i': + invert_polarity = 1; + break; + case 's': + stop = 1; + break; + } + } + + if (!devname) { + printf(" need to specify a device\n"); + return COMMAND_ERROR_USAGE; + } + if ((freq == 0) || (period == 0)) { + printf(" period or freqency needs to be non-zero\n"); + return COMMAND_ERROR_USAGE; + } + if (width > 100) { + printf(" width (%% duty cycle) can't be more than 100%%\n"); + return COMMAND_ERROR_USAGE; + } + + pwm = pwm_request(devname); + if (!pwm) { + printf(" pwm device %s not found\n", devname); + return -ENODEV; + } + + pwm_get_state(pwm, &state); + + if ((state.period_ns == 0) + && (freq < 0) && (duty < 0) && (period < 0)) { + printf(" need to know some timing info; freq or dury/period\n"); + pwm_free(pwm); + return COMMAND_ERROR_USAGE; + } + + if (invert_polarity >= 0) + state.polarity = invert_polarity; + + /* period */ + if (freq > 0) { + state.p_enable = true; + state.period_ns = HZ_TO_NANOSECONDS(freq); + if (width < 0) { + width = 50; + } + } else if (period > 0) { + state.p_enable = true; + state.period_ns = period; + } + + /* duty */ + if (width >= 0) { + pwm_set_relative_duty_cycle(&state, width, 100); + } else if (duty >= 0) { + if (duty > state.period_ns) + printf(" warning: duty_ns is greater than period\n"); + + state.duty_ns = duty; + } + + error = pwm_apply_state(pwm, &state); + + if (stop > 0) { + state.p_enable = false; + error = pwm_apply_state(pwm, &state); + } + + pwm_free(pwm); + + return error; +} + +BAREBOX_CMD_HELP_START(pwm_set) +BAREBOX_CMD_HELP_TEXT("Sets a pwm device parameters.") +BAREBOX_CMD_HELP_TEXT(" Specify the device by device name") +BAREBOX_CMD_HELP_TEXT(" Timings can either be specified via period + duty (on) duration,") +BAREBOX_CMD_HELP_TEXT(" or via frequency. Duty can be given either as a percentage or time.") +BAREBOX_CMD_HELP_TEXT(" If a parameter is not specified, the current value will be used") +BAREBOX_CMD_HELP_TEXT(" where possible - except when setting frequency, in which case") +BAREBOX_CMD_HELP_TEXT(" the 'width' will default to 50%.") +BAREBOX_CMD_HELP_TEXT(" Stopping the device does not necessarily set the output to inactive.") +BAREBOX_CMD_HELP_TEXT(" To set an output to inactive state, set the duty to 0.") +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT("-d string", "device name (eg 'pwm0')") +BAREBOX_CMD_HELP_OPT("-D number", "duty cycle (ns)") +BAREBOX_CMD_HELP_OPT("-P number", "period (ns)") +BAREBOX_CMD_HELP_OPT("-f number", "frequency (Hz)") +BAREBOX_CMD_HELP_OPT("-w number", "duty cycle (%) - the on 'width' of each cycle") +BAREBOX_CMD_HELP_OPT("-i\t", "line inverted polarity") +BAREBOX_CMD_HELP_OPT("-s\t", "stop (disable) the pwm device") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(pwm_set) + .cmd = do_pwm_set, + BAREBOX_CMD_DESC("set pwm") + BAREBOX_CMD_OPTS("[-dDPfwis]") + BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP) + BAREBOX_CMD_HELP(cmd_pwm_set_help) +BAREBOX_CMD_END -- 2.35.3