[linux-2.6-block.git] / drivers / pwm / pwm-pca9685.c

/*
 * Driver for PCA9685 16-channel 12-bit PWM LED controller
 *
 * Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
 * Copyright (C) 2015 Clemens Gruber <clemens.gruber@pqgruber.com>
 *
 * based on the pwm-twl-led.c driver
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/delay.h>

/*
 * Because the PCA9685 has only one prescaler per chip, changing the period of
 * one channel affects the period of all 16 PWM outputs!
 * However, the ratio between each configured duty cycle and the chip-wide
 * period remains constant, because the OFF time is set in proportion to the
 * counter range.
 */

#define PCA9685_MODE1		0x00
#define PCA9685_MODE2		0x01
#define PCA9685_SUBADDR1	0x02
#define PCA9685_SUBADDR2	0x03
#define PCA9685_SUBADDR3	0x04
#define PCA9685_ALLCALLADDR	0x05
#define PCA9685_LEDX_ON_L	0x06
#define PCA9685_LEDX_ON_H	0x07
#define PCA9685_LEDX_OFF_L	0x08
#define PCA9685_LEDX_OFF_H	0x09

#define PCA9685_ALL_LED_ON_L	0xFA
#define PCA9685_ALL_LED_ON_H	0xFB
#define PCA9685_ALL_LED_OFF_L	0xFC
#define PCA9685_ALL_LED_OFF_H	0xFD
#define PCA9685_PRESCALE	0xFE

#define PCA9685_PRESCALE_MIN	0x03	/* => max. frequency of 1526 Hz */
#define PCA9685_PRESCALE_MAX	0xFF	/* => min. frequency of 24 Hz */

#define PCA9685_COUNTER_RANGE	4096
#define PCA9685_DEFAULT_PERIOD	5000000	/* Default period_ns = 1/200 Hz */
#define PCA9685_OSC_CLOCK_MHZ	25	/* Internal oscillator with 25 MHz */

#define PCA9685_NUMREGS		0xFF
#define PCA9685_MAXCHAN		0x10

#define LED_FULL		(1 << 4)
#define MODE1_RESTART		(1 << 7)
#define MODE1_SLEEP		(1 << 4)
#define MODE2_INVRT		(1 << 4)
#define MODE2_OUTDRV		(1 << 2)

#define LED_N_ON_H(N)	(PCA9685_LEDX_ON_H + (4 * (N)))
#define LED_N_ON_L(N)	(PCA9685_LEDX_ON_L + (4 * (N)))
#define LED_N_OFF_H(N)	(PCA9685_LEDX_OFF_H + (4 * (N)))
#define LED_N_OFF_L(N)	(PCA9685_LEDX_OFF_L + (4 * (N)))

struct pca9685 {
	struct pwm_chip chip;
	struct regmap *regmap;
	int active_cnt;
	int duty_ns;
	int period_ns;
};

static inline struct pca9685 *to_pca(struct pwm_chip *chip)
{
	return container_of(chip, struct pca9685, chip);
}

static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			      int duty_ns, int period_ns)
{
	struct pca9685 *pca = to_pca(chip);
	unsigned long long duty;
	unsigned int reg;
	int prescale;

	if (period_ns != pca->period_ns) {
		prescale = DIV_ROUND_CLOSEST(PCA9685_OSC_CLOCK_MHZ * period_ns,
					     PCA9685_COUNTER_RANGE * 1000) - 1;

		if (prescale >= PCA9685_PRESCALE_MIN &&
			prescale <= PCA9685_PRESCALE_MAX) {
			/* Put chip into sleep mode */
			regmap_update_bits(pca->regmap, PCA9685_MODE1,
					   MODE1_SLEEP, MODE1_SLEEP);

			/* Change the chip-wide output frequency */
			regmap_write(pca->regmap, PCA9685_PRESCALE, prescale);

			/* Wake the chip up */
			regmap_update_bits(pca->regmap, PCA9685_MODE1,
					   MODE1_SLEEP, 0x0);

			/* Wait 500us for the oscillator to be back up */
			udelay(500);

			pca->period_ns = period_ns;

			/*
			 * If the duty cycle did not change, restart PWM with
			 * the same duty cycle to period ratio and return.
			 */
			if (duty_ns == pca->duty_ns) {
				regmap_update_bits(pca->regmap, PCA9685_MODE1,
						   MODE1_RESTART, 0x1);
				return 0;
			}
		} else {
			dev_err(chip->dev,
				"prescaler not set: period out of bounds!\n");
			return -EINVAL;
		}
	}

	pca->duty_ns = duty_ns;

	if (duty_ns < 1) {
		if (pwm->hwpwm >= PCA9685_MAXCHAN)
			reg = PCA9685_ALL_LED_OFF_H;
		else
			reg = LED_N_OFF_H(pwm->hwpwm);

		regmap_write(pca->regmap, reg, LED_FULL);

		return 0;
	}

	if (duty_ns == period_ns) {
		/* Clear both OFF registers */
		if (pwm->hwpwm >= PCA9685_MAXCHAN)
			reg = PCA9685_ALL_LED_OFF_L;
		else
			reg = LED_N_OFF_L(pwm->hwpwm);

		regmap_write(pca->regmap, reg, 0x0);

		if (pwm->hwpwm >= PCA9685_MAXCHAN)
			reg = PCA9685_ALL_LED_OFF_H;
		else
			reg = LED_N_OFF_H(pwm->hwpwm);

		regmap_write(pca->regmap, reg, 0x0);

		/* Set the full ON bit */
		if (pwm->hwpwm >= PCA9685_MAXCHAN)
			reg = PCA9685_ALL_LED_ON_H;
		else
			reg = LED_N_ON_H(pwm->hwpwm);

		regmap_write(pca->regmap, reg, LED_FULL);

		return 0;
	}

	duty = PCA9685_COUNTER_RANGE * (unsigned long long)duty_ns;
	duty = DIV_ROUND_UP_ULL(duty, period_ns);

	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_OFF_L;
	else
		reg = LED_N_OFF_L(pwm->hwpwm);

	regmap_write(pca->regmap, reg, (int)duty & 0xff);

	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_OFF_H;
	else
		reg = LED_N_OFF_H(pwm->hwpwm);

	regmap_write(pca->regmap, reg, ((int)duty >> 8) & 0xf);

	/* Clear the full ON bit, otherwise the set OFF time has no effect */
	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_ON_H;
	else
		reg = LED_N_ON_H(pwm->hwpwm);

	regmap_write(pca->regmap, reg, 0);

	return 0;
}

static int pca9685_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct pca9685 *pca = to_pca(chip);
	unsigned int reg;

	/*
	 * The PWM subsystem does not support a pre-delay.
	 * So, set the ON-timeout to 0
	 */
	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_ON_L;
	else
		reg = LED_N_ON_L(pwm->hwpwm);

	regmap_write(pca->regmap, reg, 0);

	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_ON_H;
	else
		reg = LED_N_ON_H(pwm->hwpwm);

	regmap_write(pca->regmap, reg, 0);

	/*
	 * Clear the full-off bit.
	 * It has precedence over the others and must be off.
	 */
	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_OFF_H;
	else
		reg = LED_N_OFF_H(pwm->hwpwm);

	regmap_update_bits(pca->regmap, reg, LED_FULL, 0x0);

	return 0;
}

static void pca9685_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct pca9685 *pca = to_pca(chip);
	unsigned int reg;

	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_OFF_H;
	else
		reg = LED_N_OFF_H(pwm->hwpwm);

	regmap_write(pca->regmap, reg, LED_FULL);

	/* Clear the LED_OFF counter. */
	if (pwm->hwpwm >= PCA9685_MAXCHAN)
		reg = PCA9685_ALL_LED_OFF_L;
	else
		reg = LED_N_OFF_L(pwm->hwpwm);

	regmap_write(pca->regmap, reg, 0x0);
}

static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct pca9685 *pca = to_pca(chip);

	if (pca->active_cnt++ == 0)
		return regmap_update_bits(pca->regmap, PCA9685_MODE1,
					  MODE1_SLEEP, 0x0);

	return 0;
}

static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct pca9685 *pca = to_pca(chip);

	if (--pca->active_cnt == 0)
		regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
				   MODE1_SLEEP);
}

static const struct pwm_ops pca9685_pwm_ops = {
	.enable = pca9685_pwm_enable,
	.disable = pca9685_pwm_disable,
	.config = pca9685_pwm_config,
	.request = pca9685_pwm_request,
	.free = pca9685_pwm_free,
	.owner = THIS_MODULE,
};

static const struct regmap_config pca9685_regmap_i2c_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = PCA9685_NUMREGS,
	.cache_type = REGCACHE_NONE,
};

static int pca9685_pwm_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct pca9685 *pca;
	int ret;
	int mode2;

	pca = devm_kzalloc(&client->dev, sizeof(*pca), GFP_KERNEL);
	if (!pca)
		return -ENOMEM;

	pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config);
	if (IS_ERR(pca->regmap)) {
		ret = PTR_ERR(pca->regmap);
		dev_err(&client->dev, "Failed to initialize register map: %d\n",
			ret);
		return ret;
	}
	pca->duty_ns = 0;
	pca->period_ns = PCA9685_DEFAULT_PERIOD;

	i2c_set_clientdata(client, pca);

	regmap_read(pca->regmap, PCA9685_MODE2, &mode2);

	if (device_property_read_bool(&client->dev, "invert"))
		mode2 |= MODE2_INVRT;
	else
		mode2 &= ~MODE2_INVRT;

	if (device_property_read_bool(&client->dev, "open-drain"))
		mode2 &= ~MODE2_OUTDRV;
	else
		mode2 |= MODE2_OUTDRV;

	regmap_write(pca->regmap, PCA9685_MODE2, mode2);

	/* clear all "full off" bits */
	regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_L, 0);
	regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_H, 0);

	pca->chip.ops = &pca9685_pwm_ops;
	/* add an extra channel for ALL_LED */
	pca->chip.npwm = PCA9685_MAXCHAN + 1;

	pca->chip.dev = &client->dev;
	pca->chip.base = -1;
	pca->chip.can_sleep = true;

	return pwmchip_add(&pca->chip);
}

static int pca9685_pwm_remove(struct i2c_client *client)
{
	struct pca9685 *pca = i2c_get_clientdata(client);

	regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
			   MODE1_SLEEP);

	return pwmchip_remove(&pca->chip);
}

static const struct i2c_device_id pca9685_id[] = {
	{ "pca9685", 0 },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(i2c, pca9685_id);

#ifdef CONFIG_ACPI
static const struct acpi_device_id pca9685_acpi_ids[] = {
	{ "INT3492", 0 },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(acpi, pca9685_acpi_ids);
#endif

#ifdef CONFIG_OF
static const struct of_device_id pca9685_dt_ids[] = {
	{ .compatible = "nxp,pca9685-pwm", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
#endif

static struct i2c_driver pca9685_i2c_driver = {
	.driver = {
		.name = "pca9685-pwm",
		.acpi_match_table = ACPI_PTR(pca9685_acpi_ids),
		.of_match_table = of_match_ptr(pca9685_dt_ids),
	},
	.probe = pca9685_pwm_probe,
	.remove = pca9685_pwm_remove,
	.id_table = pca9685_id,
};

module_i2c_driver(pca9685_i2c_driver);

MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
MODULE_DESCRIPTION("PWM driver for PCA9685");
MODULE_LICENSE("GPL");
Commit	Line	Data
88b613e6 ST	1	/*
	2	* Driver for PCA9685 16-channel 12-bit PWM LED controller
	3	*
	4	* Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
01ec8472	5	* Copyright (C) 2015 Clemens Gruber <clemens.gruber@pqgruber.com>
88b613e6 ST	6	*
	7	* based on the pwm-twl-led.c driver
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License version 2 as published by
	11	* the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful, but WITHOUT
	14	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	16	* more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along with
	19	* this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
912b8439	22	#include <linux/acpi.h>
88b613e6 ST	23	#include <linux/i2c.h>
	24	#include <linux/module.h>
	25	#include <linux/platform_device.h>
912b8439	26	#include <linux/property.h>
88b613e6 ST	27	#include <linux/pwm.h>
	28	#include <linux/regmap.h>
	29	#include <linux/slab.h>
01ec8472 CG	30	#include <linux/delay.h>
	31
	32	/*
	33	* Because the PCA9685 has only one prescaler per chip, changing the period of
	34	* one channel affects the period of all 16 PWM outputs!
	35	* However, the ratio between each configured duty cycle and the chip-wide
	36	* period remains constant, because the OFF time is set in proportion to the
	37	* counter range.
	38	*/
88b613e6 ST	39
	40	#define PCA9685_MODE1 0x00
	41	#define PCA9685_MODE2 0x01
	42	#define PCA9685_SUBADDR1 0x02
	43	#define PCA9685_SUBADDR2 0x03
	44	#define PCA9685_SUBADDR3 0x04
	45	#define PCA9685_ALLCALLADDR 0x05
	46	#define PCA9685_LEDX_ON_L 0x06
	47	#define PCA9685_LEDX_ON_H 0x07
	48	#define PCA9685_LEDX_OFF_L 0x08
	49	#define PCA9685_LEDX_OFF_H 0x09
	50
	51	#define PCA9685_ALL_LED_ON_L 0xFA
	52	#define PCA9685_ALL_LED_ON_H 0xFB
	53	#define PCA9685_ALL_LED_OFF_L 0xFC
	54	#define PCA9685_ALL_LED_OFF_H 0xFD
	55	#define PCA9685_PRESCALE 0xFE
	56
01ec8472 CG	57	#define PCA9685_PRESCALE_MIN 0x03 /* => max. frequency of 1526 Hz */
	58	#define PCA9685_PRESCALE_MAX 0xFF /* => min. frequency of 24 Hz */
	59
	60	#define PCA9685_COUNTER_RANGE 4096
	61	#define PCA9685_DEFAULT_PERIOD 5000000 /* Default period_ns = 1/200 Hz */
	62	#define PCA9685_OSC_CLOCK_MHZ 25 /* Internal oscillator with 25 MHz */
	63
88b613e6 ST	64	#define PCA9685_NUMREGS 0xFF
	65	#define PCA9685_MAXCHAN 0x10
	66
	67	#define LED_FULL (1 << 4)
01ec8472	68	#define MODE1_RESTART (1 << 7)
88b613e6 ST	69	#define MODE1_SLEEP (1 << 4)
	70	#define MODE2_INVRT (1 << 4)
	71	#define MODE2_OUTDRV (1 << 2)
	72
	73	#define LED_N_ON_H(N) (PCA9685_LEDX_ON_H + (4 * (N)))
	74	#define LED_N_ON_L(N) (PCA9685_LEDX_ON_L + (4 * (N)))
	75	#define LED_N_OFF_H(N) (PCA9685_LEDX_OFF_H + (4 * (N)))
	76	#define LED_N_OFF_L(N) (PCA9685_LEDX_OFF_L + (4 * (N)))
	77
	78	struct pca9685 {
	79	struct pwm_chip chip;
	80	struct regmap *regmap;
	81	int active_cnt;
01ec8472 CG	82	int duty_ns;
01ec8472 CG	83	int period_ns;
88b613e6 ST	84	};
	85
	86	static inline struct pca9685 to_pca(struct pwm_chip chip)
	87	{
	88	return container_of(chip, struct pca9685, chip);
	89	}
	90
	91	static int pca9685_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
	92	int duty_ns, int period_ns)
	93	{
	94	struct pca9685 *pca = to_pca(chip);
	95	unsigned long long duty;
	96	unsigned int reg;
01ec8472 CG	97	int prescale;
	98
	99	if (period_ns != pca->period_ns) {
	100	prescale = DIV_ROUND_CLOSEST(PCA9685_OSC_CLOCK_MHZ * period_ns,
	101	PCA9685_COUNTER_RANGE * 1000) - 1;
	102
	103	if (prescale >= PCA9685_PRESCALE_MIN &&
	104	prescale <= PCA9685_PRESCALE_MAX) {
	105	/* Put chip into sleep mode */
	106	regmap_update_bits(pca->regmap, PCA9685_MODE1,
	107	MODE1_SLEEP, MODE1_SLEEP);
	108
	109	/* Change the chip-wide output frequency */
	110	regmap_write(pca->regmap, PCA9685_PRESCALE, prescale);
	111
	112	/* Wake the chip up */
	113	regmap_update_bits(pca->regmap, PCA9685_MODE1,
	114	MODE1_SLEEP, 0x0);
	115
	116	/* Wait 500us for the oscillator to be back up */
	117	udelay(500);
	118
	119	pca->period_ns = period_ns;
	120
	121	/*
	122	* If the duty cycle did not change, restart PWM with
	123	* the same duty cycle to period ratio and return.
	124	*/
	125	if (duty_ns == pca->duty_ns) {
	126	regmap_update_bits(pca->regmap, PCA9685_MODE1,
	127	MODE1_RESTART, 0x1);
	128	return 0;
	129	}
	130	} else {
	131	dev_err(chip->dev,
	132	"prescaler not set: period out of bounds!\n");
	133	return -EINVAL;
	134	}
	135	}
	136
	137	pca->duty_ns = duty_ns;
88b613e6 ST	138
	139	if (duty_ns < 1) {
	140	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	141	reg = PCA9685_ALL_LED_OFF_H;
	142	else
	143	reg = LED_N_OFF_H(pwm->hwpwm);
	144
	145	regmap_write(pca->regmap, reg, LED_FULL);
	146
	147	return 0;
	148	}
	149
	150	if (duty_ns == period_ns) {
4a627b52 CG	151	/* Clear both OFF registers */
	152	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	153	reg = PCA9685_ALL_LED_OFF_L;
	154	else
	155	reg = LED_N_OFF_L(pwm->hwpwm);
	156
	157	regmap_write(pca->regmap, reg, 0x0);
	158
	159	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	160	reg = PCA9685_ALL_LED_OFF_H;
	161	else
	162	reg = LED_N_OFF_H(pwm->hwpwm);
	163
	164	regmap_write(pca->regmap, reg, 0x0);
	165
	166	/* Set the full ON bit */
88b613e6 ST	167	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	168	reg = PCA9685_ALL_LED_ON_H;
	169	else
	170	reg = LED_N_ON_H(pwm->hwpwm);
	171
	172	regmap_write(pca->regmap, reg, LED_FULL);
	173
	174	return 0;
	175	}
	176
01ec8472	177	duty = PCA9685_COUNTER_RANGE * (unsigned long long)duty_ns;
88b613e6 ST	178	duty = DIV_ROUND_UP_ULL(duty, period_ns);
	179
	180	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	181	reg = PCA9685_ALL_LED_OFF_L;
	182	else
	183	reg = LED_N_OFF_L(pwm->hwpwm);
	184
	185	regmap_write(pca->regmap, reg, (int)duty & 0xff);
	186
	187	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	188	reg = PCA9685_ALL_LED_OFF_H;
	189	else
	190	reg = LED_N_OFF_H(pwm->hwpwm);
	191
	192	regmap_write(pca->regmap, reg, ((int)duty >> 8) & 0xf);
	193
4a627b52 CG	194	/* Clear the full ON bit, otherwise the set OFF time has no effect */
	195	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	196	reg = PCA9685_ALL_LED_ON_H;
	197	else
	198	reg = LED_N_ON_H(pwm->hwpwm);
	199
	200	regmap_write(pca->regmap, reg, 0);
	201
88b613e6 ST	202	return 0;
	203	}
	204
	205	static int pca9685_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	206	{
	207	struct pca9685 *pca = to_pca(chip);
	208	unsigned int reg;
	209
	210	/*
	211	* The PWM subsystem does not support a pre-delay.
	212	* So, set the ON-timeout to 0
	213	*/
	214	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	215	reg = PCA9685_ALL_LED_ON_L;
	216	else
	217	reg = LED_N_ON_L(pwm->hwpwm);
	218
	219	regmap_write(pca->regmap, reg, 0);
	220
	221	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	222	reg = PCA9685_ALL_LED_ON_H;
	223	else
	224	reg = LED_N_ON_H(pwm->hwpwm);
	225
	226	regmap_write(pca->regmap, reg, 0);
	227
	228	/*
	229	* Clear the full-off bit.
	230	* It has precedence over the others and must be off.
	231	*/
	232	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	233	reg = PCA9685_ALL_LED_OFF_H;
	234	else
	235	reg = LED_N_OFF_H(pwm->hwpwm);
	236
	237	regmap_update_bits(pca->regmap, reg, LED_FULL, 0x0);
	238
	239	return 0;
	240	}
	241
	242	static void pca9685_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	243	{
	244	struct pca9685 *pca = to_pca(chip);
	245	unsigned int reg;
	246
	247	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	248	reg = PCA9685_ALL_LED_OFF_H;
	249	else
	250	reg = LED_N_OFF_H(pwm->hwpwm);
	251
	252	regmap_write(pca->regmap, reg, LED_FULL);
	253
	254	/* Clear the LED_OFF counter. */
	255	if (pwm->hwpwm >= PCA9685_MAXCHAN)
	256	reg = PCA9685_ALL_LED_OFF_L;
	257	else
	258	reg = LED_N_OFF_L(pwm->hwpwm);
	259
	260	regmap_write(pca->regmap, reg, 0x0);
	261	}
	262
	263	static int pca9685_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	264	{
	265	struct pca9685 *pca = to_pca(chip);
266
267	if (pca->active_cnt++ == 0)
268	return regmap_update_bits(pca->regmap, PCA9685_MODE1,
269	MODE1_SLEEP, 0x0);
270
271	return 0;
272	}
273
274	static void pca9685_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
275	{
276	struct pca9685 *pca = to_pca(chip);
277
278	if (--pca->active_cnt == 0)
279	regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
fed1bf8d	280	MODE1_SLEEP);
88b613e6 ST	281	}
	282
	283	static const struct pwm_ops pca9685_pwm_ops = {
	284	.enable = pca9685_pwm_enable,
	285	.disable = pca9685_pwm_disable,
	286	.config = pca9685_pwm_config,
	287	.request = pca9685_pwm_request,
	288	.free = pca9685_pwm_free,
3dd0a909	289	.owner = THIS_MODULE,
88b613e6 ST	290	};
88b613e6 ST	291
c456fbb2	292	static const struct regmap_config pca9685_regmap_i2c_config = {
88b613e6 ST	293	.reg_bits = 8,
	294	.val_bits = 8,
	295	.max_register = PCA9685_NUMREGS,
	296	.cache_type = REGCACHE_NONE,
	297	};
	298
	299	static int pca9685_pwm_probe(struct i2c_client *client,
	300	const struct i2c_device_id *id)
	301	{
88b613e6 ST	302	struct pca9685 *pca;
	303	int ret;
	304	int mode2;
	305
	306	pca = devm_kzalloc(&client->dev, sizeof(*pca), GFP_KERNEL);
	307	if (!pca)
	308	return -ENOMEM;
	309
	310	pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config);
	311	if (IS_ERR(pca->regmap)) {
	312	ret = PTR_ERR(pca->regmap);
	313	dev_err(&client->dev, "Failed to initialize register map: %d\n",
	314	ret);
	315	return ret;
	316	}
01ec8472 CG	317	pca->duty_ns = 0;
01ec8472 CG	318	pca->period_ns = PCA9685_DEFAULT_PERIOD;
88b613e6 ST	319
	320	i2c_set_clientdata(client, pca);
	321
	322	regmap_read(pca->regmap, PCA9685_MODE2, &mode2);
	323
912b8439	324	if (device_property_read_bool(&client->dev, "invert"))
88b613e6 ST	325	mode2 \|= MODE2_INVRT;
	326	else
	327	mode2 &= ~MODE2_INVRT;
	328
912b8439	329	if (device_property_read_bool(&client->dev, "open-drain"))
88b613e6 ST	330	mode2 &= ~MODE2_OUTDRV;
	331	else
	332	mode2 \|= MODE2_OUTDRV;
	333
	334	regmap_write(pca->regmap, PCA9685_MODE2, mode2);
	335
	336	/* clear all "full off" bits */
	337	regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_L, 0);
	338	regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_H, 0);
	339
	340	pca->chip.ops = &pca9685_pwm_ops;
	341	/* add an extra channel for ALL_LED */
	342	pca->chip.npwm = PCA9685_MAXCHAN + 1;
	343
	344	pca->chip.dev = &client->dev;
	345	pca->chip.base = -1;
	346	pca->chip.can_sleep = true;
	347
	348	return pwmchip_add(&pca->chip);
	349	}
	350
	351	static int pca9685_pwm_remove(struct i2c_client *client)
	352	{
	353	struct pca9685 *pca = i2c_get_clientdata(client);
	354
fed1bf8d AL	355	regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
fed1bf8d AL	356	MODE1_SLEEP);
88b613e6 ST	357
	358	return pwmchip_remove(&pca->chip);
	359	}
	360
	361	static const struct i2c_device_id pca9685_id[] = {
	362	{ "pca9685", 0 },
	363	{ /* sentinel */ },
	364	};
	365	MODULE_DEVICE_TABLE(i2c, pca9685_id);
	366
912b8439 AS	367	#ifdef CONFIG_ACPI
	368	static const struct acpi_device_id pca9685_acpi_ids[] = {
	369	{ "INT3492", 0 },
	370	{ /* sentinel */ },
	371	};
	372	MODULE_DEVICE_TABLE(acpi, pca9685_acpi_ids);
	373	#endif
	374
	375	#ifdef CONFIG_OF
88b613e6 ST	376	static const struct of_device_id pca9685_dt_ids[] = {
	377	{ .compatible = "nxp,pca9685-pwm", },
	378	{ /* sentinel */ }
	379	};
	380	MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
912b8439	381	#endif
88b613e6 ST	382
	383	static struct i2c_driver pca9685_i2c_driver = {
	384	.driver = {
	385	.name = "pca9685-pwm",
912b8439 AS	386	.acpi_match_table = ACPI_PTR(pca9685_acpi_ids),
912b8439 AS	387	.of_match_table = of_match_ptr(pca9685_dt_ids),
88b613e6 ST	388	},
	389	.probe = pca9685_pwm_probe,
	390	.remove = pca9685_pwm_remove,
	391	.id_table = pca9685_id,
	392	};
	393
	394	module_i2c_driver(pca9685_i2c_driver);
	395
	396	MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
	397	MODULE_DESCRIPTION("PWM driver for PCA9685");
	398	MODULE_LICENSE("GPL");