1 // SPDX-License-Identifier: GPL-2.0
16 #include <dt-bindings/mfd/cros_ec.h>
19  * struct cros_ec_pwm_device - Driver data for EC PWM
24  * @channel: array with per-channel data
34  * struct cros_ec_pwm - per-PWM driver data
35  * @duty_cycle: cached duty cycle
56 		return -EINVAL;  in cros_ec_dt_type_to_pwm_type()
61 				u16 duty)  in cros_ec_pwm_set_duty()  argument
63 	struct cros_ec_device *ec = ec_pwm->ec;  in cros_ec_pwm_set_duty()
74 	msg->version = 0;  in cros_ec_pwm_set_duty()
75 	msg->command = EC_CMD_PWM_SET_DUTY;  in cros_ec_pwm_set_duty()
76 	msg->insize = 0;  in cros_ec_pwm_set_duty()
77 	msg->outsize = sizeof(*params);  in cros_ec_pwm_set_duty()
79 	params->duty = duty;  in cros_ec_pwm_set_duty()
81 	if (ec_pwm->use_pwm_type) {  in cros_ec_pwm_set_duty()
82 		ret = cros_ec_dt_type_to_pwm_type(index, &params->pwm_type);  in cros_ec_pwm_set_duty()
84 			dev_err(ec->dev, "Invalid PWM type index: %d\n", index);  in cros_ec_pwm_set_duty()
87 		params->index = 0;  in cros_ec_pwm_set_duty()
89 		params->pwm_type = EC_PWM_TYPE_GENERIC;  in cros_ec_pwm_set_duty()
90 		params->index = index;  in cros_ec_pwm_set_duty()
98 	struct cros_ec_device *ec = ec_pwm->ec;  in cros_ec_pwm_get_duty()
113 	msg->version = 0;  in cros_ec_pwm_get_duty()
114 	msg->command = EC_CMD_PWM_GET_DUTY;  in cros_ec_pwm_get_duty()
115 	msg->insize = sizeof(*resp);  in cros_ec_pwm_get_duty()
116 	msg->outsize = sizeof(*params);  in cros_ec_pwm_get_duty()
118 	if (ec_pwm->use_pwm_type) {  in cros_ec_pwm_get_duty()
119 		ret = cros_ec_dt_type_to_pwm_type(index, &params->pwm_type);  in cros_ec_pwm_get_duty()
121 			dev_err(ec->dev, "Invalid PWM type index: %d\n", index);  in cros_ec_pwm_get_duty()
124 		params->index = 0;  in cros_ec_pwm_get_duty()
126 		params->pwm_type = EC_PWM_TYPE_GENERIC;  in cros_ec_pwm_get_duty()
127 		params->index = index;  in cros_ec_pwm_get_duty()
134 	return resp->duty;  in cros_ec_pwm_get_duty()
141 	struct cros_ec_pwm *channel = &ec_pwm->channel[pwm->hwpwm];  in cros_ec_pwm_apply()
146 	if (state->period != EC_PWM_MAX_DUTY)  in cros_ec_pwm_apply()
147 		return -EINVAL;  in cros_ec_pwm_apply()
149 	if (state->polarity != PWM_POLARITY_NORMAL)  in cros_ec_pwm_apply()
150 		return -EINVAL;  in cros_ec_pwm_apply()
153 	 * EC doesn't separate the concept of duty cycle and enabled, but  in cros_ec_pwm_apply()
156 	duty_cycle = state->enabled ? state->duty_cycle : 0;  in cros_ec_pwm_apply()
158 	ret = cros_ec_pwm_set_duty(ec_pwm, pwm->hwpwm, duty_cycle);  in cros_ec_pwm_apply()
162 	channel->duty_cycle = state->duty_cycle;  in cros_ec_pwm_apply()
171 	struct cros_ec_pwm *channel = &ec_pwm->channel[pwm->hwpwm];  in cros_ec_pwm_get_state()
174 	ret = cros_ec_pwm_get_duty(ec_pwm, pwm->hwpwm);  in cros_ec_pwm_get_state()
176 		dev_err(chip->dev, "error getting initial duty: %d\n", ret);  in cros_ec_pwm_get_state()
180 	state->enabled = (ret > 0);  in cros_ec_pwm_get_state()
181 	state->period = EC_PWM_MAX_DUTY;  in cros_ec_pwm_get_state()
182 	state->polarity = PWM_POLARITY_NORMAL;  in cros_ec_pwm_get_state()
185 	 * Note that "disabled" and "duty cycle == 0" are treated the same. If  in cros_ec_pwm_get_state()
186 	 * the cached duty cycle is not zero, used the cached duty cycle. This  in cros_ec_pwm_get_state()
187 	 * ensures that the configured duty cycle is kept across a disable and  in cros_ec_pwm_get_state()
190 	 * For the case of the initial hardware readout, channel->duty_cycle  in cros_ec_pwm_get_state()
191 	 * will be 0 and the actual duty cycle read from the EC is used.  in cros_ec_pwm_get_state()
193 	if (ret == 0 && channel->duty_cycle > 0)  in cros_ec_pwm_get_state()
194 		state->duty_cycle = channel->duty_cycle;  in cros_ec_pwm_get_state()
196 		state->duty_cycle = ret;  in cros_ec_pwm_get_state()
206 	if (args->args[0] >= chip->npwm)  in cros_ec_pwm_xlate()
207 		return ERR_PTR(-EINVAL);  in cros_ec_pwm_xlate()
209 	pwm = pwm_request_from_chip(chip, args->args[0], NULL);  in cros_ec_pwm_xlate()
214 	pwm->args.period = EC_PWM_MAX_DUTY;  in cros_ec_pwm_xlate()
226  * of PWMs it supports directly, so we have to read the pwm duty cycle for
239 		 * The EC error codes map to -EOPNOTSUPP and -EINVAL,  in cros_ec_num_pwms()
243 		case -EOPNOTSUPP:	/* invalid command */  in cros_ec_num_pwms()
244 			return -ENODEV;  in cros_ec_num_pwms()
245 		case -EINVAL:		/* invalid parameter */  in cros_ec_num_pwms()
259 	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);  in cros_ec_pwm_probe()
260 	struct device *dev = &pdev->dev;  in cros_ec_pwm_probe()
261 	struct device_node *np = pdev->dev.of_node;  in cros_ec_pwm_probe()
267 		return dev_err_probe(dev, -EINVAL, "no parent EC device\n");  in cros_ec_pwm_probe()
271 		return -ENOMEM;  in cros_ec_pwm_probe()
272 	chip = &ec_pwm->chip;  in cros_ec_pwm_probe()
273 	ec_pwm->ec = ec;  in cros_ec_pwm_probe()
275 	if (of_device_is_compatible(np, "google,cros-ec-pwm-type"))  in cros_ec_pwm_probe()
276 		ec_pwm->use_pwm_type = true;  in cros_ec_pwm_probe()
279 	chip->dev = dev;  in cros_ec_pwm_probe()
280 	chip->ops = &cros_ec_pwm_ops;  in cros_ec_pwm_probe()
281 	chip->of_xlate = cros_ec_pwm_xlate;  in cros_ec_pwm_probe()
282 	chip->of_pwm_n_cells = 1;  in cros_ec_pwm_probe()
284 	if (ec_pwm->use_pwm_type) {  in cros_ec_pwm_probe()
285 		chip->npwm = CROS_EC_PWM_DT_COUNT;  in cros_ec_pwm_probe()
290 		chip->npwm = ret;  in cros_ec_pwm_probe()
293 	ec_pwm->channel = devm_kcalloc(dev, chip->npwm, sizeof(*ec_pwm->channel),  in cros_ec_pwm_probe()
295 	if (!ec_pwm->channel)  in cros_ec_pwm_probe()
296 		return -ENOMEM;  in cros_ec_pwm_probe()
298 	dev_dbg(dev, "Probed %u PWMs\n", chip->npwm);  in cros_ec_pwm_probe()
309 	{ .compatible = "google,cros-ec-pwm" },
310 	{ .compatible = "google,cros-ec-pwm-type" },
319 		.name = "cros-ec-pwm",
325 MODULE_ALIAS("platform:cros-ec-pwm");