Lines Matching +full:pwm +full:- +full:trigger
1 // SPDX-License-Identifier: GPL-2.0-only
6 * Generic PWM trigger for SPI offload.
16 #include <linux/pwm.h>
24 struct pwm_device *pwm; member
27 static bool spi_offload_trigger_pwm_match(struct spi_offload_trigger *trigger, in spi_offload_trigger_pwm_match() argument
37 static int spi_offload_trigger_pwm_validate(struct spi_offload_trigger *trigger, in spi_offload_trigger_pwm_validate() argument
40 struct spi_offload_trigger_pwm_state *st = spi_offload_trigger_get_priv(trigger); in spi_offload_trigger_pwm_validate()
41 struct spi_offload_trigger_periodic *periodic = &config->periodic; in spi_offload_trigger_pwm_validate()
45 if (config->type != SPI_OFFLOAD_TRIGGER_PERIODIC) in spi_offload_trigger_pwm_validate()
46 return -EINVAL; in spi_offload_trigger_pwm_validate()
48 if (!periodic->frequency_hz) in spi_offload_trigger_pwm_validate()
49 return -EINVAL; in spi_offload_trigger_pwm_validate()
51 wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz); in spi_offload_trigger_pwm_validate()
52 /* REVISIT: 50% duty-cycle for now - may add config parameter later */ in spi_offload_trigger_pwm_validate()
55 ret = pwm_round_waveform_might_sleep(st->pwm, &wf); in spi_offload_trigger_pwm_validate()
59 periodic->frequency_hz = DIV_ROUND_UP_ULL(NSEC_PER_SEC, wf.period_length_ns); in spi_offload_trigger_pwm_validate()
64 static int spi_offload_trigger_pwm_enable(struct spi_offload_trigger *trigger, in spi_offload_trigger_pwm_enable() argument
67 struct spi_offload_trigger_pwm_state *st = spi_offload_trigger_get_priv(trigger); in spi_offload_trigger_pwm_enable()
68 struct spi_offload_trigger_periodic *periodic = &config->periodic; in spi_offload_trigger_pwm_enable()
71 if (config->type != SPI_OFFLOAD_TRIGGER_PERIODIC) in spi_offload_trigger_pwm_enable()
72 return -EINVAL; in spi_offload_trigger_pwm_enable()
74 if (!periodic->frequency_hz) in spi_offload_trigger_pwm_enable()
75 return -EINVAL; in spi_offload_trigger_pwm_enable()
77 wf.period_length_ns = DIV_ROUND_UP_ULL(NSEC_PER_SEC, periodic->frequency_hz); in spi_offload_trigger_pwm_enable()
78 /* REVISIT: 50% duty-cycle for now - may add config parameter later */ in spi_offload_trigger_pwm_enable()
81 return pwm_set_waveform_might_sleep(st->pwm, &wf, false); in spi_offload_trigger_pwm_enable()
84 static void spi_offload_trigger_pwm_disable(struct spi_offload_trigger *trigger) in spi_offload_trigger_pwm_disable() argument
86 struct spi_offload_trigger_pwm_state *st = spi_offload_trigger_get_priv(trigger); in spi_offload_trigger_pwm_disable()
90 ret = pwm_get_waveform_might_sleep(st->pwm, &wf); in spi_offload_trigger_pwm_disable()
92 dev_err(st->dev, "failed to get waveform: %d\n", ret); in spi_offload_trigger_pwm_disable()
98 ret = pwm_set_waveform_might_sleep(st->pwm, &wf, false); in spi_offload_trigger_pwm_disable()
100 dev_err(st->dev, "failed to disable PWM: %d\n", ret); in spi_offload_trigger_pwm_disable()
117 struct device *dev = &pdev->dev; in spi_offload_trigger_pwm_probe()
128 return -ENOMEM; in spi_offload_trigger_pwm_probe()
131 st->dev = dev; in spi_offload_trigger_pwm_probe()
133 st->pwm = devm_pwm_get(dev, NULL); in spi_offload_trigger_pwm_probe()
134 if (IS_ERR(st->pwm)) in spi_offload_trigger_pwm_probe()
135 return dev_err_probe(dev, PTR_ERR(st->pwm), "failed to get PWM\n"); in spi_offload_trigger_pwm_probe()
137 /* init with duty_cycle = 0, output enabled to ensure trigger off */ in spi_offload_trigger_pwm_probe()
138 pwm_init_state(st->pwm, &state); in spi_offload_trigger_pwm_probe()
141 ret = pwm_apply_might_sleep(st->pwm, &state); in spi_offload_trigger_pwm_probe()
143 return dev_err_probe(dev, ret, "failed to apply PWM state\n"); in spi_offload_trigger_pwm_probe()
145 ret = devm_add_action_or_reset(dev, spi_offload_trigger_pwm_release, st->pwm); in spi_offload_trigger_pwm_probe()
153 { .compatible = "pwm-trigger" },
160 .name = "pwm-trigger",
168 MODULE_DESCRIPTION("Generic PWM trigger");