1 // SPDX-License-Identifier: GPL-2.0-only
8  * This driver is a complete rewrite of the former pwm-twl6030.c authorded by:
15  * - The twl6030 hardware only supports two period lengths (128 clock ticks and
17  * - The hardware doesn't support ON = 0, so the active part of a period doesn't
19  * - The hardware could support inverted polarity (with a similar limitation as
21  * - The hardware emits a constant low output when disabled.
22  * - A request for .duty_cycle = 0 results in an output wave with one active
24  * - The driver only implements setting the relative duty cycle.
25  * - The driver doesn't implement .get_state().
38  *  - LEDA uses PWMA
39  *  - LEDB uses PWMB
64 static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip)  in to_twl()  argument
66 	return pwmchip_get_drvdata(chip);  in to_twl()
69 static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,  in twl4030_pwmled_config()  argument
78 	 * On-cycle is set to 1 (the minimum allowed value)  in twl4030_pwmled_config()
80 	 * 0 -> off cycle = 2,  in twl4030_pwmled_config()
81 	 * 1 -> off cycle = 2,  in twl4030_pwmled_config()
82 	 * 2 -> off cycle = 3,  in twl4030_pwmled_config()
83 	 * 126 - > off cycle 127,  in twl4030_pwmled_config()
84 	 * 127 - > off cycle 1  in twl4030_pwmled_config()
92 	base = pwm->hwpwm * 2 + TWL4030_PWMA_REG;  in twl4030_pwmled_config()
98 		dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);  in twl4030_pwmled_config()
103 static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in twl4030_pwmled_enable()  argument
110 		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);  in twl4030_pwmled_enable()
114 	val |= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);  in twl4030_pwmled_enable()
118 		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);  in twl4030_pwmled_enable()
123 static void twl4030_pwmled_disable(struct pwm_chip *chip,  in twl4030_pwmled_disable()  argument
131 		dev_err(pwmchip_parent(chip), "%s: Failed to read LEDEN\n", pwm->label);  in twl4030_pwmled_disable()
135 	val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);  in twl4030_pwmled_disable()
139 		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);  in twl4030_pwmled_disable()
142 static int twl4030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in twl4030_pwmled_apply()  argument
147 	if (state->polarity != PWM_POLARITY_NORMAL)  in twl4030_pwmled_apply()
148 		return -EINVAL;  in twl4030_pwmled_apply()
150 	if (!state->enabled) {  in twl4030_pwmled_apply()
151 		if (pwm->state.enabled)  in twl4030_pwmled_apply()
152 			twl4030_pwmled_disable(chip, pwm);  in twl4030_pwmled_apply()
158 	 * We cannot skip calling ->config even if state->period ==  in twl4030_pwmled_apply()
159 	 * pwm->state.period && state->duty_cycle == pwm->state.duty_cycle  in twl4030_pwmled_apply()
161 	 * pwm_apply_might_sleep because of !state->enabled and so the two values in  in twl4030_pwmled_apply()
162 	 * pwm->state might not be configured in hardware.  in twl4030_pwmled_apply()
164 	ret = twl4030_pwmled_config(chip, pwm,  in twl4030_pwmled_apply()
165 				    state->duty_cycle, state->period);  in twl4030_pwmled_apply()
169 	if (!pwm->state.enabled)  in twl4030_pwmled_apply()
170 		ret = twl4030_pwmled_enable(chip, pwm);  in twl4030_pwmled_apply()
180 static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,  in twl6030_pwmled_config()  argument
192 		dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);  in twl6030_pwmled_config()
197 static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in twl6030_pwmled_enable()  argument
204 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",  in twl6030_pwmled_enable()
205 			pwm->label);  in twl6030_pwmled_enable()
214 		dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);  in twl6030_pwmled_enable()
219 static void twl6030_pwmled_disable(struct pwm_chip *chip,  in twl6030_pwmled_disable()  argument
227 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",  in twl6030_pwmled_disable()
228 			pwm->label);  in twl6030_pwmled_disable()
237 		dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);  in twl6030_pwmled_disable()
240 static int twl6030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,  in twl6030_pwmled_apply()  argument
245 	if (state->polarity != pwm->state.polarity)  in twl6030_pwmled_apply()
246 		return -EINVAL;  in twl6030_pwmled_apply()
248 	if (!state->enabled) {  in twl6030_pwmled_apply()
249 		if (pwm->state.enabled)  in twl6030_pwmled_apply()
250 			twl6030_pwmled_disable(chip, pwm);  in twl6030_pwmled_apply()
255 	err = twl6030_pwmled_config(chip, pwm,  in twl6030_pwmled_apply()
256 				    state->duty_cycle, state->period);  in twl6030_pwmled_apply()
260 	if (!pwm->state.enabled)  in twl6030_pwmled_apply()
261 		err = twl6030_pwmled_enable(chip, pwm);  in twl6030_pwmled_apply()
266 static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)  in twl6030_pwmled_request()  argument
273 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",  in twl6030_pwmled_request()
274 			pwm->label);  in twl6030_pwmled_request()
283 		dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);  in twl6030_pwmled_request()
288 static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)  in twl6030_pwmled_free()  argument
295 		dev_err(pwmchip_parent(chip), "%s: Failed to read PWM_CTRL2\n",  in twl6030_pwmled_free()
296 			pwm->label);  in twl6030_pwmled_free()
305 		dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);  in twl6030_pwmled_free()
316 	struct pwm_chip *chip;  in twl_pwmled_probe()  local
328 	chip = devm_pwmchip_alloc(&pdev->dev, npwm, 0);  in twl_pwmled_probe()
329 	if (IS_ERR(chip))  in twl_pwmled_probe()
330 		return PTR_ERR(chip);  in twl_pwmled_probe()
332 	chip->ops = ops;  in twl_pwmled_probe()
334 	return devm_pwmchip_add(&pdev->dev, chip);  in twl_pwmled_probe()
339 	{ .compatible = "ti,twl4030-pwmled" },
340 	{ .compatible = "ti,twl6030-pwmled" },
348 		.name = "twl-pwmled",
357 MODULE_ALIAS("platform:twl-pwmled");