1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * cx20442.c  --  CX20442 ALSA Soc Audio driver
94 		return -EINVAL;  in cx20442_read_reg_cache()
96 	return cx20442->reg_cache;  in cx20442_read_reg_cache()
139 	return -EINVAL;  in cx20442_pm_to_v253_vls()
149 	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;  in cx20442_pm_to_v253_vsp()
160 		return -EINVAL;  in cx20442_write()
162 	/* tty and write pointers required for talking to the modem  in cx20442_write()
164 	if (!cx20442->tty || !cx20442->tty->ops->write)  in cx20442_write()
165 		return -EIO;  in cx20442_write()
167 	old = cx20442->reg_cache;  in cx20442_write()
168 	cx20442->reg_cache = value;  in cx20442_write()
189 	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))  in cx20442_write()
190 		return -ENOMEM;  in cx20442_write()
192 	dev_dbg(component->dev, "%s: %s\n", __func__, buf);  in cx20442_write()
193 	if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)  in cx20442_write()
194 		return -EIO;  in cx20442_write()
208 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
217 	if (!tty->ops->write)  in v253_open()
218 		return -EINVAL;  in v253_open()
221 	if (!tty->disc_data)  in v253_open()
222 		return -ENODEV;  in v253_open()
224 	tty->receive_room = 16;  in v253_open()
225 	if (tty->ops->write(tty, v253_init, len) != len) {  in v253_open()
226 		ret = -EIO;  in v253_open()
229 	/* Actual setup will be performed after the modem responds. */  in v253_open()
232 	tty->disc_data = NULL;  in v253_open()
239 	struct snd_soc_component *component = tty->disc_data;  in v253_close()
242 	tty->disc_data = NULL;  in v253_close()
249 	/* Prevent the codec driver from further accessing the modem */  in v253_close()
250 	cx20442->tty = NULL;  in v253_close()
251 	component->card->pop_time = 0;  in v253_close()
265 	struct snd_soc_component *component = tty->disc_data;  in v253_receive()
273 	if (!cx20442->tty) {  in v253_receive()
274 		/* First modem response, complete setup procedure */  in v253_receive()
276 		/* Set up codec driver access to modem controls */  in v253_receive()
277 		cx20442->tty = tty;  in v253_receive()
278 		component->card->pop_time = 1;  in v253_receive()
305 	.name = "cx20442-voice",
332 		if (IS_ERR(cx20442->por))  in cx20442_set_bias_level()
333 			err = PTR_ERR(cx20442->por);  in cx20442_set_bias_level()
335 			err = regulator_enable(cx20442->por);  in cx20442_set_bias_level()
340 		if (IS_ERR(cx20442->por))  in cx20442_set_bias_level()
341 			err = PTR_ERR(cx20442->por);  in cx20442_set_bias_level()
343 			err = regulator_disable(cx20442->por);  in cx20442_set_bias_level()
358 		return -ENOMEM;  in cx20442_component_probe()
360 	cx20442->por = regulator_get(component->dev, "POR");  in cx20442_component_probe()
361 	if (IS_ERR(cx20442->por)) {  in cx20442_component_probe()
362 		int err = PTR_ERR(cx20442->por);  in cx20442_component_probe()
364 		dev_warn(component->dev, "failed to get POR supply (%d)", err);  in cx20442_component_probe()
366 		 * When running on a non-dt platform and requested regulator  in cx20442_component_probe()
368 		 * -EPROBE_DEFER as it is not able to justify if the regulator  in cx20442_component_probe()
372 		 * sufficient.  Hence, if we get -ENODEV here, let's convert  in cx20442_component_probe()
373 		 * it to -EPROBE_DEFER and wait for the board to decide or  in cx20442_component_probe()
376 		if (err == -ENODEV)  in cx20442_component_probe()
377 			err = -EPROBE_DEFER;  in cx20442_component_probe()
382 	cx20442->tty = NULL;  in cx20442_component_probe()
385 	component->card->pop_time = 0;  in cx20442_component_probe()
395 	if (cx20442->tty) {  in cx20442_component_remove()
396 		struct tty_struct *tty = cx20442->tty;  in cx20442_component_remove()
400 	if (!IS_ERR(cx20442->por)) {  in cx20442_component_remove()
402 		regulator_put(cx20442->por);  in cx20442_component_remove()
427 	return devm_snd_soc_register_component(&pdev->dev,  in cx20442_platform_probe()
433 		.name = "cx20442-codec",
440 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
443 MODULE_ALIAS("platform:cx20442-codec");