1 // SPDX-License-Identifier: GPL-2.0-only
6  * Author: Peter Meerwald <p.meerwald@bct-electronic.com>
9  * Based on leds-pca955x.c
11  * LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
12  * LED driver for the PCA9634/5 I2C LED driver (7-bit slave address set by hw.)
22  * or by adding the 'nxp,hw-blink' property to the DTS.
43 #define PCA963X_MODE2_OUTDRV	0x04	/* Open-drain or totem pole */
86 /* Total blink period in milliseconds */
121 	struct i2c_client *client = led->chip->client;  in pca963x_brightness()
122 	struct pca963x_chipdef *chipdef = led->chip->chipdef;  in pca963x_brightness()
127 	ledout_addr = chipdef->ledout_base + (led->led_num / 4);  in pca963x_brightness()
128 	shift = 2 * (led->led_num % 4);  in pca963x_brightness()
134 		if (led->blinking) {  in pca963x_brightness()
138 						led->led_num,  in pca963x_brightness()
148 		led->blinking = false;  in pca963x_brightness()
153 						led->led_num,  in pca963x_brightness()
158 		if (led->blinking)  in pca963x_brightness()
172 	struct i2c_client *client = led->chip->client;  in pca963x_blink()
173 	struct pca963x_chipdef *chipdef = led->chip->chipdef;  in pca963x_blink()
177 	ledout_addr = chipdef->ledout_base + (led->led_num / 4);  in pca963x_blink()
178 	shift = 2 * (led->led_num % 4);  in pca963x_blink()
182 	i2c_smbus_write_byte_data(client, chipdef->grppwm, led->gdc);  in pca963x_blink()
184 	i2c_smbus_write_byte_data(client, chipdef->grpfreq, led->gfrq);  in pca963x_blink()
190 	mutex_lock(&led->chip->mutex);  in pca963x_blink()
198 	mutex_unlock(&led->chip->mutex);  in pca963x_blink()
199 	led->blinking = true;  in pca963x_blink()
204 	struct i2c_client *client = led->chip->client;  in pca963x_power_state()
205 	unsigned long *leds_on = &led->chip->leds_on;  in pca963x_power_state()
208 	if (led->led_cdev.brightness)  in pca963x_power_state()
209 		set_bit(led->led_num, leds_on);  in pca963x_power_state()
211 		clear_bit(led->led_num, leds_on);  in pca963x_power_state()
228 	mutex_lock(&led->chip->mutex);  in pca963x_led_set()
236 	mutex_unlock(&led->chip->mutex);  in pca963x_led_set()
243 	unsigned int scaling = led->chip->chipdef->scaling;  in pca963x_period_scale()
251 	unsigned long time_on, time_off, period;  in pca963x_blink_set()  local
266 	period = pca963x_period_scale(led, time_on + time_off);  in pca963x_blink_set()
268 	/* If period not supported by hardware, default to someting sane. */  in pca963x_blink_set()
269 	if ((period < PCA963X_BLINK_PERIOD_MIN) ||  in pca963x_blink_set()
270 	    (period > PCA963X_BLINK_PERIOD_MAX)) {  in pca963x_blink_set()
273 		period = pca963x_period_scale(led, 1000);  in pca963x_blink_set()
277 	 * From manual: duty cycle = (GDC / 256) ->  in pca963x_blink_set()
278 	 *	(time_on / period) = (GDC / 256) ->  in pca963x_blink_set()
279 	 *		GDC = ((time_on * 256) / period)  in pca963x_blink_set()
281 	gdc = (pca963x_period_scale(led, time_on) * 256) / period;  in pca963x_blink_set()
284 	 * From manual: period = ((GFRQ + 1) / 24) in seconds.  in pca963x_blink_set()
285 	 * So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->  in pca963x_blink_set()
286 	 *		GFRQ = ((period * 24 / 1000) - 1)  in pca963x_blink_set()
288 	gfrq = (period * 24 / 1000) - 1;  in pca963x_blink_set()
290 	led->gdc = gdc;  in pca963x_blink_set()
291 	led->gfrq = gfrq;  in pca963x_blink_set()
294 	led->led_cdev.brightness = LED_FULL;  in pca963x_blink_set()
306 	struct pca963x_chipdef *chipdef = chip->chipdef;  in pca963x_register_leds()
307 	struct pca963x_led *led = chip->leds;  in pca963x_register_leds()
308 	struct device *dev = &client->dev;  in pca963x_register_leds()
314 	if (device_property_read_u32(dev, "nxp,period-scale",  in pca963x_register_leds()
315 				     &chipdef->scaling))  in pca963x_register_leds()
316 		chipdef->scaling = 1000;  in pca963x_register_leds()
318 	hw_blink = device_property_read_bool(dev, "nxp,hw-blink");  in pca963x_register_leds()
324 	/* default to open-drain unless totem pole (push-pull) is specified */  in pca963x_register_leds()
325 	if (device_property_read_bool(dev, "nxp,totem-pole"))  in pca963x_register_leds()
330 	/* default to non-inverted output, unless inverted is specified */  in pca963x_register_leds()
331 	if (device_property_read_bool(dev, "nxp,inverted-out"))  in pca963x_register_leds()
345 		if (ret || reg >= chipdef->n_leds) {  in pca963x_register_leds()
348 			return -EINVAL;  in pca963x_register_leds()
351 		led->led_num = reg;  in pca963x_register_leds()
352 		led->chip = chip;  in pca963x_register_leds()
353 		led->led_cdev.brightness_set_blocking = pca963x_led_set;  in pca963x_register_leds()
355 			led->led_cdev.blink_set = pca963x_blink_set;  in pca963x_register_leds()
356 		led->blinking = false;  in pca963x_register_leds()
362 			 client->adapter->nr, client->addr, reg);  in pca963x_register_leds()
365 		ret = devm_led_classdev_register_ext(dev, &led->led_cdev,  in pca963x_register_leds()
384 	reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);  in pca963x_suspend()
386 	i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);  in pca963x_suspend()
396 	reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);  in pca963x_resume()
398 	i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);  in pca963x_resume()
417 	struct device *dev = &client->dev;  in pca963x_probe()
422 	chipdef = &pca963x_chipdefs[id->driver_data];  in pca963x_probe()
425 	if (!count || count > chipdef->n_leds) {  in pca963x_probe()
427 			dev_fwnode(dev), chipdef->n_leds);  in pca963x_probe()
428 		return -EINVAL;  in pca963x_probe()
433 		return -ENOMEM;  in pca963x_probe()
437 	mutex_init(&chip->mutex);  in pca963x_probe()
438 	chip->chipdef = chipdef;  in pca963x_probe()
439 	chip->client = client;  in pca963x_probe()
442 	for (i = 0; i < chipdef->n_leds / 4; i++)  in pca963x_probe()
443 		i2c_smbus_write_byte_data(client, chipdef->ledout_base + i, 0x00);  in pca963x_probe()
445 	/* Disable LED all-call address, and power down initially */  in pca963x_probe()
453 		.name	= "leds-pca963x",
463 MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");