Hi Petr,
This is review only of the LED subsystem related part of this patch,.
On 08/13/2015 12:51 AM, Petr Cvek wrote:
Fixing original code: Problems to successful boot due to the bad LCD
power sequence (wrongly configured GPIO).
Add/fix platform data and helper function for various hardware
(touchscreen, audio, USB device, ...).
Add new discovered GPIOs and fix names by GPIO context.
Add new LEDs driver.
Signed-off-by: Petr Cvek <petr.cvek@xxxxxx>
---
arch/arm/mach-pxa/Kconfig | 1 +
arch/arm/mach-pxa/include/mach/magician.h | 21 +-
arch/arm/mach-pxa/magician.c | 1148 +++++++++++++++++++++++------
drivers/leds/Kconfig | 9 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-pasic3.c | 192 +++++
drivers/mfd/htc-pasic3.c | 115 ++-
include/linux/mfd/htc-pasic3.h | 69 +-
8 files changed, 1293 insertions(+), 263 deletions(-)
create mode 100644 drivers/leds/leds-pasic3.c
[...]
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 9ad35f7..516ba65 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -586,6 +586,15 @@ config LEDS_PM8941_WLED
This option enables support for the 'White' LED block
on Qualcomm PM8941 PMICs.
+config LEDS_PASIC3
+ tristate "LED support for the HTC Magician/Alpine PASIC3"
+ depends on LEDS_CLASS
+ depends on HTC_PASIC3
+ select REGMAP
+ help
+ This option enables support for the PASIC3 chip (different chip
+ than Compaq ASIC3).
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 8d6a24a..b1c659c 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
obj-$(CONFIG_LEDS_PM8941_WLED) += leds-pm8941-wled.o
obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
+obj-$(CONFIG_LEDS_PASIC3) += leds-pasic3.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-pasic3.c b/drivers/leds/leds-pasic3.c
new file mode 100644
index 0000000..ecb0557
--- /dev/null
+++ b/drivers/leds/leds-pasic3.c
@@ -0,0 +1,192 @@
+/*
+ * AIC3 (or PASIC3) LED driver for HTC Magician/Alpine/.. (not Compaq ASIC3)
+ *
+ * Copyright (c) 2015 Petr Cvek <petr.cvek@xxxxxx>
+ *
+ * Based on leds-asic3.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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+
This empty line is not required.
+#include <linux/mfd/htc-pasic3.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
Please keep alphabetical order across all includes.
+/*
+ * 1 tick is around 62-63 ms, blinking settings (on+off):
+ * Min: 1+1 ticks ~125ms
+ * Max: 127+127 ticks ~15 875ms
+ * Sometimes takes time to change after write (counter overflow?)
+ */
+
+#define MS_TO_CLK(ms) DIV_ROUND_CLOSEST(((ms)*1024), 64000)
+#define CLK_TO_MS(clk) (((clk)*64000)/1024)
+#define MAX_CLK 254 /* 127 + 127 (2x 7 bit reg) */
+#define MAX_MS CLK_TO_MS(MAX_CLK)
+
+static void brightness_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct platform_device *pdev = to_platform_device(cdev->dev->parent);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct pasic3_led *led;
+ struct device *dev;
+ u8 val;
+
+ if (!cell->platform_data) {
+ pr_err("No platform data\n");
+ return;
+ }
+
+ led = cell->platform_data;
+ dev = pdev->dev.parent;
+
+ if (value == LED_OFF) {
+ val = pasic3_read_register(dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(dev, PASIC3_CH_CONTROL,
+ val & ~(led->bit_blink_en | led->bit_force_on));
+
+ val = pasic3_read_register(dev, PASIC3_MASK_A);
+ pasic3_write_register(dev, PASIC3_MASK_A, val & ~led->bit_mask);
I think that you need spin_lock protection as setting brightness
is not an atomic operation here. Moreover pasic3_write_register
calls __raw_writeb twice, without spin_lock protection. This function
is used also in drivers/mfd/htc-pasic3.c - shouldn't it be fixed?
+ } else {
+ val = pasic3_read_register(dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(dev, PASIC3_CH_CONTROL,
+ val | led->bit_force_on);
+ }
+}
+
+static int blink_set(struct led_classdev *cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct platform_device *pdev = to_platform_device(cdev->dev->parent);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct device *dev;
+ struct pasic3_led *led;
+ u32 on, off;
+ u8 val;
+
+ if (!cell->platform_data) {
+ pr_err("No platform data\n");
+ return -EINVAL;
+ }
+
+ if (*delay_on > MAX_MS || *delay_off > MAX_MS)
+ return -EINVAL;
+
+ if (*delay_on == 0 && *delay_off == 0) {
+ /* If both are zero then a sensible default should be chosen */
+ on = MS_TO_CLK(500);
+ off = MS_TO_CLK(500);
+ } else {
+ on = MS_TO_CLK(*delay_on);
+ off = MS_TO_CLK(*delay_off);
+ if ((on + off) > MAX_CLK)
+ return -EINVAL;
+ /* Minimal value must be 1 */
+ on = on ? on : 1;
+ off = off ? off : 1;
+ }
+
+ led = cell->platform_data;
+ dev = pdev->dev.parent;
+
+ pasic3_write_register(dev, led->reg_delay_on, on);
+ pasic3_write_register(dev, led->reg_delay_off, off);
+
+ val = pasic3_read_register(dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(dev, PASIC3_CH_CONTROL, val | led->bit_blink_en);
Ditto.
+ *delay_on = CLK_TO_MS(on);
+ *delay_off = CLK_TO_MS(off);
+
+ return 0;
+}
+
+static int pasic3_led_probe(struct platform_device *pdev)
+{
+ struct pasic3_led *led = dev_get_platdata(&pdev->dev);
+ int ret;
+
+ ret = mfd_cell_enable(pdev);
+ if (ret < 0)
+ return ret;
+
+ led->cdev.flags = LED_CORE_SUSPENDRESUME;
+ led->cdev.brightness_set = brightness_set;
+ led->cdev.blink_set = blink_set;
You need to set also led->cdev.name. What is the name of your
LED in the sysfs now?
+ ret = led_classdev_register(&pdev->dev, &led->cdev);
+ if (ret < 0)
+ goto out;
Please use devm_led_classdev_register.
+ return 0;
+
+out:
+ (void) mfd_cell_disable(pdev);
+ return ret;
+}
+
+static int pasic3_led_remove(struct platform_device *pdev)
+{
+ struct pasic3_led *led = dev_get_platdata(&pdev->dev);
+
+ led_classdev_unregister(&led->cdev);
+
+ return mfd_cell_disable(pdev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pasic3_led_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ int ret;
+
+ ret = 0;
+ if (cell->suspend)
+ ret = (*cell->suspend)(pdev);
+
+ return ret;
+}
+
+static int pasic3_led_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ int ret;
+
+ ret = 0;
+ if (cell->resume)
+ ret = (*cell->resume)(pdev);
+
+ return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pasic3_led_pm_ops, pasic3_led_suspend,
+ pasic3_led_resume);
+
+static struct platform_driver pasic3_led_driver = {
+ .probe = pasic3_led_probe,
+ .remove = pasic3_led_remove,
+ .driver = {
+ .name = "leds-pasic3",
+ .pm = &pasic3_led_pm_ops,
+ },
+};
+
+module_platform_driver(pasic3_led_driver);
+
+MODULE_AUTHOR("Petr Cvek <petr.cvek@xxxxxx>");
+MODULE_DESCRIPTION("HTC Magician PASIC3 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-pasic3");
[...]
--
Best Regards,
Jacek Anaszewski
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