summaryrefslogtreecommitdiff
path: root/drivers/hwmon/gpio-fan.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-07 11:55:16 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-07 11:55:16 (GMT)
commit5e090ed7af10729a396a25df43d69a236e789736 (patch)
tree09ba2dd9974b5224721fbc413bcf6ac9b2ac73f9 /drivers/hwmon/gpio-fan.c
parent84424026c0a910886064049d414a12a4f4dd125e (diff)
parent54d69df5849ec2e660aa12ac75562618c10fb499 (diff)
downloadlinux-5e090ed7af10729a396a25df43d69a236e789736.tar.xz
Merge tag 'soc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull late ARM soc platform updates from Olof Johansson: "This branch contains updates to OMAP and Marvell platforms (kirkwood, dove, mvebu) that came in after we had done the big multiplatform merges, so they were kept separate from the rest, and not separated into the traditional topics of cleanup/driver/platform features. For OMAP, the updates are: - Runtime PM conversions for the GPMC and RNG IP blocks - Preparation patches for the OMAP common clock framework conversion - clkdev alias additions required by other drivers - Performance Monitoring Unit (PMU) support for OMAP2, 3, and non-4430 OMAP4 - OMAP hwmod code and data improvements - Preparation patches for the IOMMU runtime PM conversion - Preparation patches for OMAP4 full-chip retention support For Kirkwood/Dove/mvebu: - New driver for "address decoder controller" for mvebu, which is a piece of hardware that configures addressable devices and peripherals. First user is the boot rom aperture on armada XP since it is needed for SMP support. - New device tree bindings for peripherals such as gpio-fan, iconnect nand, mv_cesa and the above address decoder controller. - Some defconfig updates, mostly to enable new DT boards and a few drivers. - New drivers using the pincontrol subsystem for dove, kirkwood and mvebu - New clean gpio driver for mvebu" * tag 'soc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (98 commits) ARM: mvebu: fix build breaks from multi-platform conversion ARM: OMAP4460/4470: PMU: Enable PMU for OMAP4460/70 ARM: OMAP2+: PMU: Add runtime PM support ARM: OMAP4430: PMU: prepare to create PMU device via HWMOD ARM: OMAP2+: PMU: Convert OMAP2/3 devices to use HWMOD ARM: OMAP3: hwmod data: Add debugss HWMOD data ARM: OMAP2+: clockdomain/hwmod: add workaround for EMU clockdomain idle problems ARM: OMAP: Add a timer attribute for timers that can interrupt the DSP hwrng: OMAP: remove SoC restrictions from driver registration ARM: OMAP: split OMAP1, OMAP2+ RNG device registration hwrng: OMAP: convert to use runtime PM hwrng: OMAP: store per-device data in per-device variables, not file statics ARM: OMAP2xxx: hwmod/CM: add RNG integration data ARM: OMAP2+: gpmc: minimal driver support ARM: OMAP2+: gpmc: Adapt to HWMOD ARM: OMAP2/3: hwmod data: add gpmc ARM: OMAP4: hwmod data: add mmu hwmod for ipu and dsp ARM: OMAP3: hwmod data: add mmu data for iva and isp ARM: OMAP: iommu: fix including iommu.h without IOMMU_API selected ARM: OMAP4: hwmod data: add missing HWMOD_NO_IDLEST flags to some PRCM IP blocks ...
Diffstat (limited to 'drivers/hwmon/gpio-fan.c')
-rw-r--r--drivers/hwmon/gpio-fan.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 2f4b01b..36509ae 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -31,6 +31,8 @@
#include <linux/hwmon.h>
#include <linux/gpio.h>
#include <linux/gpio-fan.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
struct gpio_fan_data {
struct platform_device *pdev;
@@ -400,14 +402,131 @@ static ssize_t show_name(struct device *dev,
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static int gpio_fan_get_of_pdata(struct device *dev,
+ struct gpio_fan_platform_data *pdata)
+{
+ struct device_node *node;
+ struct gpio_fan_speed *speed;
+ unsigned *ctrl;
+ unsigned i;
+ u32 u;
+ struct property *prop;
+ const __be32 *p;
+
+ node = dev->of_node;
+
+ /* Fill GPIO pin array */
+ pdata->num_ctrl = of_gpio_count(node);
+ if (!pdata->num_ctrl) {
+ dev_err(dev, "gpios DT property empty / missing");
+ return -ENODEV;
+ }
+ ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned),
+ GFP_KERNEL);
+ if (!ctrl)
+ return -ENOMEM;
+ for (i = 0; i < pdata->num_ctrl; i++) {
+ int val;
+
+ val = of_get_gpio(node, i);
+ if (val < 0)
+ return val;
+ ctrl[i] = val;
+ }
+ pdata->ctrl = ctrl;
+
+ /* Get number of RPM/ctrl_val pairs in speed map */
+ prop = of_find_property(node, "gpio-fan,speed-map", &i);
+ if (!prop) {
+ dev_err(dev, "gpio-fan,speed-map DT property missing");
+ return -ENODEV;
+ }
+ i = i / sizeof(u32);
+ if (i == 0 || i & 1) {
+ dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
+ return -ENODEV;
+ }
+ pdata->num_speed = i / 2;
+
+ /*
+ * Populate speed map
+ * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
+ * this needs splitting into pairs to create gpio_fan_speed structs
+ */
+ speed = devm_kzalloc(dev,
+ pdata->num_speed * sizeof(struct gpio_fan_speed),
+ GFP_KERNEL);
+ if (!speed)
+ return -ENOMEM;
+ p = NULL;
+ for (i = 0; i < pdata->num_speed; i++) {
+ p = of_prop_next_u32(prop, p, &u);
+ if (!p)
+ return -ENODEV;
+ speed[i].rpm = u;
+ p = of_prop_next_u32(prop, p, &u);
+ if (!p)
+ return -ENODEV;
+ speed[i].ctrl_val = u;
+ }
+ pdata->speed = speed;
+
+ /* Alarm GPIO if one exists */
+ if (of_gpio_named_count(node, "alarm-gpios")) {
+ struct gpio_fan_alarm *alarm;
+ int val;
+ enum of_gpio_flags flags;
+
+ alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
+ GFP_KERNEL);
+ if (!alarm)
+ return -ENOMEM;
+
+ val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags);
+ if (val < 0)
+ return val;
+ alarm->gpio = val;
+ alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
+
+ pdata->alarm = alarm;
+ }
+
+ return 0;
+}
+
+static struct of_device_id of_gpio_fan_match[] __devinitdata = {
+ { .compatible = "gpio-fan", },
+ {},
+};
+#endif /* CONFIG_OF_GPIO */
+
static int __devinit gpio_fan_probe(struct platform_device *pdev)
{
int err;
struct gpio_fan_data *fan_data;
struct gpio_fan_platform_data *pdata = pdev->dev.platform_data;
+#ifdef CONFIG_OF_GPIO
+ if (!pdata) {
+ pdata = devm_kzalloc(&pdev->dev,
+ sizeof(struct gpio_fan_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
+ if (err)
+ return err;
+ }
+#else /* CONFIG_OF_GPIO */
if (!pdata)
return -EINVAL;
+#endif /* CONFIG_OF_GPIO */
fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
GFP_KERNEL);
@@ -511,6 +630,7 @@ static struct platform_driver gpio_fan_driver = {
.driver = {
.name = "gpio-fan",
.pm = GPIO_FAN_PM,
+ .of_match_table = of_match_ptr(of_gpio_fan_match),
},
};