pwm: add pca9685 driver

Add pwm driver for the NXP pca9685 16 channel pwm-led controller.

The driver is really barebones at this stage. E.g. the OE' pin and
therefore the corresponding registers are not supported.
The driver was tested on a HW where this pin is tied to GND.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
[thierry.reding@gmail.com: style and whitespace cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
new file mode 100644
index 00000000000..2afc9043550
--- /dev/null
+++ b/drivers/pwm/pwm-pca9685.c
@@ -0,0 +1,298 @@
+/*
+ * Driver for PCA9685 16-channel 12-bit PWM LED controller
+ *
+ * Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ *
+ * 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/i2c.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#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_NUMREGS		0xFF
+#define PCA9685_MAXCHAN		0x10
+
+#define LED_FULL		(1 << 4)
+#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;
+};
+
+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;
+
+	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) {
+		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 = 4096 * (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);
+
+	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,
+				   0x1);
+}
+
+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,
+};
+
+static 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 device_node *np = client->dev.of_node;
+	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;
+	}
+
+	i2c_set_clientdata(client, pca);
+
+	regmap_read(pca->regmap, PCA9685_MODE2, &mode2);
+
+	if (of_property_read_bool(np, "invert"))
+		mode2 |= MODE2_INVRT;
+	else
+		mode2 &= ~MODE2_INVRT;
+
+	if (of_property_read_bool(np, "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, 0x1);
+
+	return pwmchip_remove(&pca->chip);
+}
+
+static const struct i2c_device_id pca9685_id[] = {
+	{ "pca9685", 0 },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(i2c, pca9685_id);
+
+static const struct of_device_id pca9685_dt_ids[] = {
+	{ .compatible = "nxp,pca9685-pwm", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
+
+static struct i2c_driver pca9685_i2c_driver = {
+	.driver = {
+		.name = "pca9685-pwm",
+		.owner = THIS_MODULE,
+		.of_match_table = 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");