[PATCH v2 19/21] leds: leds-pasic3: Add support for PASIC3 LED controller

Petr Cvek
2015-08-17T22:03:28Z

Add support for LEDs inside the PASIC3 chip.

Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
---
drivers/leds/Kconfig | 9 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-pasic3.c | 232 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 242 insertions(+)
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..0f95230
--- /dev/null
+++ b/drivers/leds/leds-pasic3.c
@@ -0,0 +1,232 @@
+/*
+ * AIC3 (or PASIC3) LED driver for HTC Magician/Alpine/.. (not Compaq ASIC3)
+ *
+ * Copyright (c) 2015 Petr Cvek <petr.cvek@tul.cz>
+ *
+ * CLK to MS calculation based on leds-asic3.c
+ *
+ * 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.
+ *
+ */
+
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/mfd/htc-pasic3.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/*
+ * 1 tick is around 62-63 ms, blinking settings (on+off):
+ * Min: 1+1 ticks ~125ms
+ * Max: 127+127 ticks ~15 875ms
+ * HW sometimes takes time to change (counter overflow after write?)
+ */
+
+#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)
+
+spinlock_t lock;
+
+static void brightness_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct platform_device *pdev = to_platform_device(cdev->dev->parent);
+ struct pasic3_led *led = dev_get_platdata(cdev->dev);
+ struct pasic3_leds_pdata *pdata = dev_get_platdata(&pdev->dev);
+ unsigned long flags;
+ u8 val;
+
+ spin_lock_irqsave(&lock, flags);
+
+ if (value == LED_OFF) {
+ val = pasic3_read_register(pdata->mfd_dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(pdata->mfd_dev, PASIC3_CH_CONTROL,
+ val & ~(led->bit_blink_en | led->bit_force_on));
+
+ val = pasic3_read_register(pdata->mfd_dev, PASIC3_MASK_A);
+ pasic3_write_register(pdata->mfd_dev, PASIC3_MASK_A,
+ val & ~led->bit_mask);
+
+ if (pdata->power_gpio) {
+ pdata->power_gpio_users--;
+
+ if (pdata->power_gpio_users == 0)
+ gpio_set_value(pdata->power_gpio, 0);
+ }
+ } else {
+ if (pdata->power_gpio) {
+ pdata->power_gpio_users++;
+
+ if (pdata->power_gpio_users != 0)
+ gpio_set_value(pdata->power_gpio, 1);
+ }
+
+ val = pasic3_read_register(pdata->mfd_dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(pdata->mfd_dev, PASIC3_CH_CONTROL,
+ val | led->bit_force_on);
+ }
+
+ spin_unlock_irqrestore(&lock, flags);
+}
+
+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);
+ struct pasic3_led *led = dev_get_platdata(cdev->dev);
+ struct pasic3_leds_pdata *pdata = dev_get_platdata(&pdev->dev);
+ unsigned long flags;
+ u32 on, off;
+ u8 val;
+
+ if (*delay_on > MAX_MS || *delay_off > MAX_MS)
+ return -EINVAL;
+
+ if (*delay_on == 0 && *delay_off == 0) {
+ /* Choose sensible default delays */
+ 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 on/off value must be 1 */
+ on = on ? on : 1;
+ off = off ? off : 1;
+ }
+
+ spin_lock_irqsave(&lock, flags);
+
+ pasic3_write_register(pdata->mfd_dev, led->reg_delay_on, on);
+ pasic3_write_register(pdata->mfd_dev, led->reg_delay_off, off);
+
+ val = pasic3_read_register(pdata->mfd_dev, PASIC3_CH_CONTROL);
+ pasic3_write_register(pdata->mfd_dev, PASIC3_CH_CONTROL,
+ val | led->bit_blink_en);
+
+ spin_unlock_irqrestore(&lock, flags);
+
+ *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_leds_pdata *pdata = dev_get_platdata(&pdev->dev);
+ struct led_classdev *cdev;
+ int ret;
+ int i;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "no platform data\n");
+ return -EINVAL;
+ }
+
+ if (!pdata->leds) {
+ dev_err(&pdev->dev, "no leds data\n");
+ return -EINVAL;
+ }
+
+ if (pdata->power_gpio) {
+ pdata->power_gpio_users = 0;
+
+ ret = gpio_request(pdata->power_gpio,
+ "Red-Blue LED Power");
+ if (ret < 0) {
+ dev_warn(&pdev->dev, "failed to request power GPIO\n");
+ goto err;
+ }
+ }
+
+ spin_lock_init(&lock);
+
+ cdev = devm_kzalloc(&pdev->dev,
+ sizeof(struct led_classdev) * pdata->num_leds, GFP_KERNEL);
+ if (!cdev) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ cdev[i].name = pdata->leds[i].name;
+ cdev[i].default_trigger = pdata->leds[i].default_trigger;
+ cdev[i].flags = LED_CORE_SUSPENDRESUME;
+ cdev[i].brightness_set = brightness_set;
+ cdev[i].blink_set = blink_set;
+
+ ret = devm_led_classdev_register(&pdev->dev, &cdev[i]);
+ if (ret < 0)
+ goto err;
+
+ cdev[i].dev->platform_data = &pdata->leds[i];
+ }
+
+ return 0;
+
+err:
+ if (pdata->power_gpio)
+ gpio_free(pdata->power_gpio);
+
+ return ret;
+}
+
+static int pasic3_led_remove(struct platform_device *pdev)
+{
+ struct pasic3_leds_pdata *pdata = dev_get_platdata(&pdev->dev);
+
+ if (pdata->power_gpio)
+ gpio_free(pdata->power_gpio);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pasic3_led_suspend(struct device *dev)
+{
+ struct pasic3_leds_pdata *pdata = dev_get_platdata(dev);
+
+ if (pdata->power_gpio)
+ gpio_set_value(pdata->power_gpio, 0);
+
+ return 0;
+}
+
+static int pasic3_led_resume(struct device *dev)
+{
+ struct pasic3_leds_pdata *pdata = dev_get_platdata(dev);
+
+ if (pdata->power_gpio)
+ gpio_set_value(pdata->power_gpio, 1);
+
+ return 0;
+}
+#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@tul.cz>");
+MODULE_DESCRIPTION("HTC Magician PASIC3 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-pasic3");
--
1.7.12.1