Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon updates from Guenter Roeck:
 "Notable changes:

   - Heiko Schocher provided a driver for TI TMP103.
   - Kamil Debski provided a driver for pwm-controlled fans.
   - Neelesh Gupta provided a driver for power, fan rpm, voltage and
     temperature reporting on powerpc/powernv systems.
   - Scott Kanowitz provided a driver supporting Lattice's POWR1220
     power manager IC.
   - Richard Zhu provided a pmbus front-end driver for TPS40422.
   - Frans Klaver added support for TMP112 to the lm75 driver.
   - Johannes Pointner added support for EPCOS B57330V2103 to the
     ntc_thermistor driver.
   - Guenter Roeck added support for TMP441 and TMP442 to the tmp421
     driver.
   - Axel Lin converted several drivers to the new hwmon API (36 of
     them, if I counted correctly), and cleaned up many of the drivers
     along the way.

  There are also a number of patches fixing bugs discovered while
  testing Axel's changes"

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (88 commits)
  hwmon: (g762) Use of_property_read_u32 at appropriate place
  hwmon: (sis5595) Prevent overflow problem when writing large limits
  hwmon: (gpio-fan) Prevent overflow problem when writing large limits
  hwmon: (ibmpowernv) Use of_property_read_u32 at appropriate place
  hwmon: (lm85) Convert to devm_hwmon_device_register_with_groups
  hwmon: (lm85) Avoid forward declaration
  hwmon: (lm78) Convert to devm_hwmon_device_register_with_groups
  hwmon: (max6697) Use of_property_read_bool at appropriate places
  hwmon: (pwm-fan) Make SENSORS_PWM_FAN depend on OF
  hwmon: (pwm-fan) Remove duplicate dev_set_drvdata call
  hwmon: (nct6775) Remove num_attr_groups from struct nct6775_data
  hwmon: (nct6775) Update module description and Kconfig for NCT6106D and NCT6791D
  hwmon: (adt7411) Convert to devm_hwmon_device_register_with_groups
  hwmon: (g762) Convert to hwmon_device_register_with_groups
  hwmon: (emc2103) Convert to devm_hwmon_device_register_with_groups
  hwmon: (smsc47m1) Avoid forward declaration
  hwmon: (smsc47m192) Convert to devm_hwmon_device_register_with_groups
  hwmon: (smsc47m192) Avoid forward declaration
  hwmon: (max1668) Make max1668_addr_list array const
  hwmon: (max6639) Make normal_i2c array const
  ...

1 files changed, 193 insertions, 0 deletions

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
new file mode 100644
index 000000000000..823c877a1ec0
--- /dev/null
+++ b/drivers/hwmon/pwm-fan.c
@@ -0,0 +1,193 @@
+/*
+ * pwm-fan.c - Hwmon driver for fans connected to PWM lines.
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *
+ * Author: Kamil Debski <k.debski@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/sysfs.h>
+
+#define MAX_PWM 255
+
+struct pwm_fan_ctx {
+	struct mutex lock;
+	struct pwm_device *pwm;
+	unsigned char pwm_value;
+};
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t count)
+{
+	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+	unsigned long pwm, duty;
+	ssize_t ret;
+
+	if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM)
+		return -EINVAL;
+
+	mutex_lock(&ctx->lock);
+
+	if (ctx->pwm_value == pwm)
+		goto exit_set_pwm_no_change;
+
+	if (pwm == 0) {
+		pwm_disable(ctx->pwm);
+		goto exit_set_pwm;
+	}
+
+	duty = DIV_ROUND_UP(pwm * (ctx->pwm->period - 1), MAX_PWM);
+	ret = pwm_config(ctx->pwm, duty, ctx->pwm->period);
+	if (ret)
+		goto exit_set_pwm_err;
+
+	if (ctx->pwm_value == 0) {
+		ret = pwm_enable(ctx->pwm);
+		if (ret)
+			goto exit_set_pwm_err;
+	}
+
+exit_set_pwm:
+	ctx->pwm_value = pwm;
+exit_set_pwm_no_change:
+	ret = count;
+exit_set_pwm_err:
+	mutex_unlock(&ctx->lock);
+	return ret;
+}
+
+static ssize_t show_pwm(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ctx->pwm_value);
+}
+
+
+static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0);
+
+static struct attribute *pwm_fan_attrs[] = {
+	&sensor_dev_attr_pwm1.dev_attr.attr,
+	NULL,
+};
+
+ATTRIBUTE_GROUPS(pwm_fan);
+
+static int pwm_fan_probe(struct platform_device *pdev)
+{
+	struct device *hwmon;
+	struct pwm_fan_ctx *ctx;
+	int duty_cycle;
+	int ret;
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mutex_init(&ctx->lock);
+
+	ctx->pwm = devm_of_pwm_get(&pdev->dev, pdev->dev.of_node, NULL);
+	if (IS_ERR(ctx->pwm)) {
+		dev_err(&pdev->dev, "Could not get PWM\n");
+		return PTR_ERR(ctx->pwm);
+	}
+
+	platform_set_drvdata(pdev, ctx);
+
+	/* Set duty cycle to maximum allowed */
+	duty_cycle = ctx->pwm->period - 1;
+	ctx->pwm_value = MAX_PWM;
+
+	ret = pwm_config(ctx->pwm, duty_cycle, ctx->pwm->period);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to configure PWM\n");
+		return ret;
+	}
+
+	/* Enbale PWM output */
+	ret = pwm_enable(ctx->pwm);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable PWM\n");
+		return ret;
+	}
+
+	hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "pwmfan",
+						       ctx, pwm_fan_groups);
+	if (IS_ERR(hwmon)) {
+		dev_err(&pdev->dev, "Failed to register hwmon device\n");
+		pwm_disable(ctx->pwm);
+		return PTR_ERR(hwmon);
+	}
+	return 0;
+}
+
+static int pwm_fan_remove(struct platform_device *pdev)
+{
+	struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
+
+	if (ctx->pwm_value)
+		pwm_disable(ctx->pwm);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pwm_fan_suspend(struct device *dev)
+{
+	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+
+	if (ctx->pwm_value)
+		pwm_disable(ctx->pwm);
+	return 0;
+}
+
+static int pwm_fan_resume(struct device *dev)
+{
+	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+
+	if (ctx->pwm_value)
+		return pwm_enable(ctx->pwm);
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pwm_fan_pm, pwm_fan_suspend, pwm_fan_resume);
+
+static struct of_device_id of_pwm_fan_match[] = {
+	{ .compatible = "pwm-fan", },
+	{},
+};
+
+static struct platform_driver pwm_fan_driver = {
+	.probe		= pwm_fan_probe,
+	.remove		= pwm_fan_remove,
+	.driver	= {
+		.name		= "pwm-fan",
+		.pm		= &pwm_fan_pm,
+		.of_match_table	= of_pwm_fan_match,
+	},
+};
+
+module_platform_driver(pwm_fan_driver);
+
+MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
+MODULE_ALIAS("platform:pwm-fan");
+MODULE_DESCRIPTION("PWM FAN driver");
+MODULE_LICENSE("GPL");