1 // SPDX-License-Identifier: GPL-2.0-only
3  * Regulator driver for PWM Regulators
5  * Copyright (C) 2014 - STMicroelectronics Inc.
18 #include <linux/pwm.h>
29 	struct pwm_device *pwm;  member
48 	unsigned int dutycycle;  member
52  * Voltage table call-backs
58 	unsigned int dutycycle;  in pwm_regulator_init_state()  local
61 	pwm_get_state(drvdata->pwm, &pwm_state);  in pwm_regulator_init_state()
62 	dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);  in pwm_regulator_init_state()
64 	for (i = 0; i < rdev->desc->n_voltages; i++) {  in pwm_regulator_init_state()
65 		if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {  in pwm_regulator_init_state()
66 			drvdata->state = i;  in pwm_regulator_init_state()
76 	if (drvdata->state < 0)  in pwm_regulator_get_voltage_sel()
79 	return drvdata->state;  in pwm_regulator_get_voltage_sel()
89 	pwm_init_state(drvdata->pwm, &pstate);  in pwm_regulator_set_voltage_sel()
91 			drvdata->duty_cycle_table[selector].dutycycle, 100);  in pwm_regulator_set_voltage_sel()
93 	ret = pwm_apply_might_sleep(drvdata->pwm, &pstate);  in pwm_regulator_set_voltage_sel()
95 		dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);  in pwm_regulator_set_voltage_sel()
99 	drvdata->state = selector;  in pwm_regulator_set_voltage_sel()
109 	if (selector >= rdev->desc->n_voltages)  in pwm_regulator_list_voltage()
110 		return -EINVAL;  in pwm_regulator_list_voltage()
112 	return drvdata->duty_cycle_table[selector].uV;  in pwm_regulator_list_voltage()
119 	gpiod_set_value_cansleep(drvdata->enb_gpio, 1);  in pwm_regulator_enable()
121 	return pwm_enable(drvdata->pwm);  in pwm_regulator_enable()
128 	pwm_disable(drvdata->pwm);  in pwm_regulator_disable()
130 	gpiod_set_value_cansleep(drvdata->enb_gpio, 0);  in pwm_regulator_disable()
139 	if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio))  in pwm_regulator_is_enabled()
142 	return pwm_is_enabled(drvdata->pwm);  in pwm_regulator_is_enabled()
148 	unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;  in pwm_regulator_get_voltage()
149 	unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;  in pwm_regulator_get_voltage()
150 	unsigned int duty_unit = drvdata->continuous.dutycycle_unit;  in pwm_regulator_get_voltage()
151 	int min_uV = rdev->constraints->min_uV;  in pwm_regulator_get_voltage()
152 	int max_uV = rdev->constraints->max_uV;  in pwm_regulator_get_voltage()
153 	int diff_uV = max_uV - min_uV;  in pwm_regulator_get_voltage()
158 	pwm_get_state(drvdata->pwm, &pstate);  in pwm_regulator_get_voltage()
170 		return -ENOTRECOVERABLE;  in pwm_regulator_get_voltage()
173 	 * The dutycycle for min_uV might be greater than the one for max_uV.  in pwm_regulator_get_voltage()
175 	 * PWM device does not support inversing it in hardware.  in pwm_regulator_get_voltage()
178 		voltage = min_uV_duty - voltage;  in pwm_regulator_get_voltage()
179 		diff_duty = min_uV_duty - max_uV_duty;  in pwm_regulator_get_voltage()
181 		voltage = voltage - min_uV_duty;  in pwm_regulator_get_voltage()
182 		diff_duty = max_uV_duty - min_uV_duty;  in pwm_regulator_get_voltage()
195 	unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;  in pwm_regulator_set_voltage()
196 	unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;  in pwm_regulator_set_voltage()
197 	unsigned int duty_unit = drvdata->continuous.dutycycle_unit;  in pwm_regulator_set_voltage()
198 	int min_uV = rdev->constraints->min_uV;  in pwm_regulator_set_voltage()
199 	int max_uV = rdev->constraints->max_uV;  in pwm_regulator_set_voltage()
200 	int diff_uV = max_uV - min_uV;  in pwm_regulator_set_voltage()
203 	unsigned int dutycycle;  in pwm_regulator_set_voltage()  local
206 	pwm_init_state(drvdata->pwm, &pstate);  in pwm_regulator_set_voltage()
209 	 * The dutycycle for min_uV might be greater than the one for max_uV.  in pwm_regulator_set_voltage()
211 	 * PWM device does not support inversing it in hardware.  in pwm_regulator_set_voltage()
214 		diff_duty = min_uV_duty - max_uV_duty;  in pwm_regulator_set_voltage()
216 		diff_duty = max_uV_duty - min_uV_duty;  in pwm_regulator_set_voltage()
218 	dutycycle = DIV_ROUND_CLOSEST_ULL((u64)(req_min_uV - min_uV) *  in pwm_regulator_set_voltage()
223 		dutycycle = min_uV_duty - dutycycle;  in pwm_regulator_set_voltage()
225 		dutycycle = min_uV_duty + dutycycle;  in pwm_regulator_set_voltage()
227 	pwm_set_relative_duty_cycle(&pstate, dutycycle, duty_unit);  in pwm_regulator_set_voltage()
229 	ret = pwm_apply_might_sleep(drvdata->pwm, &pstate);  in pwm_regulator_set_voltage()
231 		dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);  in pwm_regulator_set_voltage()
257 	.name		= "pwm-regulator",
260 	.supply_name    = "pwm",
266 	struct device_node *np = pdev->dev.of_node;  in pwm_regulator_init_table()
271 	of_find_property(np, "voltage-table", &length);  in pwm_regulator_init_table()
275 		dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",  in pwm_regulator_init_table()
277 		return -EINVAL;  in pwm_regulator_init_table()
280 	duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);  in pwm_regulator_init_table()
282 		return -ENOMEM;  in pwm_regulator_init_table()
284 	ret = of_property_read_u32_array(np, "voltage-table",  in pwm_regulator_init_table()
288 		dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);  in pwm_regulator_init_table()
292 	drvdata->state			= -ENOTRECOVERABLE;  in pwm_regulator_init_table()
293 	drvdata->duty_cycle_table	= duty_cycle_table;  in pwm_regulator_init_table()
294 	drvdata->desc.ops = &pwm_regulator_voltage_table_ops;  in pwm_regulator_init_table()
295 	drvdata->desc.n_voltages	= length / sizeof(*duty_cycle_table);  in pwm_regulator_init_table()
306 	drvdata->desc.ops = &pwm_regulator_voltage_continuous_ops;  in pwm_regulator_init_continuous()
307 	drvdata->desc.continuous_voltage_range = true;  in pwm_regulator_init_continuous()
309 	of_property_read_u32_array(pdev->dev.of_node,  in pwm_regulator_init_continuous()
310 				   "pwm-dutycycle-range",  in pwm_regulator_init_continuous()
312 	of_property_read_u32(pdev->dev.of_node, "pwm-dutycycle-unit",  in pwm_regulator_init_continuous()
317 		return -EINVAL;  in pwm_regulator_init_continuous()
319 	drvdata->continuous.dutycycle_unit = dutycycle_unit;  in pwm_regulator_init_continuous()
320 	drvdata->continuous.min_uV_dutycycle = dutycycle_range[0];  in pwm_regulator_init_continuous()
321 	drvdata->continuous.max_uV_dutycycle = dutycycle_range[1];  in pwm_regulator_init_continuous()
332 	if (!init_data->constraints.boot_on || drvdata->enb_gpio)  in pwm_regulator_init_boot_on()
335 	pwm_get_state(drvdata->pwm, &pstate);  in pwm_regulator_init_boot_on()
342 	 * thus the PWM channel).  in pwm_regulator_init_boot_on()
349 	return pwm_apply_might_sleep(drvdata->pwm, &pstate);  in pwm_regulator_init_boot_on()
358 	struct device_node *np = pdev->dev.of_node;  in pwm_regulator_probe()
363 		dev_err(&pdev->dev, "Device Tree node missing\n");  in pwm_regulator_probe()
364 		return -EINVAL;  in pwm_regulator_probe()
367 	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);  in pwm_regulator_probe()
369 		return -ENOMEM;  in pwm_regulator_probe()
371 	memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));  in pwm_regulator_probe()
373 	if (of_property_present(np, "voltage-table"))  in pwm_regulator_probe()
380 	init_data = of_get_regulator_init_data(&pdev->dev, np,  in pwm_regulator_probe()
381 					       &drvdata->desc);  in pwm_regulator_probe()
383 		return -ENOMEM;  in pwm_regulator_probe()
386 	config.dev = &pdev->dev;  in pwm_regulator_probe()
390 	drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);  in pwm_regulator_probe()
391 	if (IS_ERR(drvdata->pwm))  in pwm_regulator_probe()
392 		return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->pwm),  in pwm_regulator_probe()
393 				     "Failed to get PWM\n");  in pwm_regulator_probe()
395 	if (init_data->constraints.boot_on || init_data->constraints.always_on)  in pwm_regulator_probe()
399 	drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",  in pwm_regulator_probe()
401 	if (IS_ERR(drvdata->enb_gpio)) {  in pwm_regulator_probe()
402 		ret = PTR_ERR(drvdata->enb_gpio);  in pwm_regulator_probe()
403 		dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret);  in pwm_regulator_probe()
407 	ret = pwm_adjust_config(drvdata->pwm);  in pwm_regulator_probe()
413 		dev_err(&pdev->dev, "Failed to apply boot_on settings: %d\n",  in pwm_regulator_probe()
418 	regulator = devm_regulator_register(&pdev->dev,  in pwm_regulator_probe()
419 					    &drvdata->desc, &config);  in pwm_regulator_probe()
422 		dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",  in pwm_regulator_probe()
423 			drvdata->desc.name, ret);  in pwm_regulator_probe()
431 	{ .compatible = "pwm-regulator" },
438 		.name		= "pwm-regulator",
449 MODULE_DESCRIPTION("PWM Regulator Driver");
450 MODULE_ALIAS("platform:pwm-regulator");