leds: Add ASIC3 LED support

Add LED support for the HTC ASIC3. Underlying support is provided by the mfd/asic3 and leds/leds-asic3 drivers. An example configuration is provided by the pxa/hx4700 platform.

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1d027b475b22563c7d0c5eea64103b4e0b48d307..23f0d5e99f35705c97c165e05b05a7e5239804b7 100644 (file)
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -389,6 +389,16 @@ config LEDS_NETXBIG
          and 5Big Network v2 boards. The LEDs are wired to a CPLD and are
          controlled through a GPIO extension bus.
 
+config LEDS_ASIC3
+       bool "LED support for the HTC ASIC3"
+       depends on MFD_ASIC3
+       default y
+       help
+         This option enables support for the LEDs on the HTC ASIC3. The HTC
+         ASIC3 LED GPIOs are inputs, not outputs, thus the leds-gpio driver
+         cannot be used. This driver supports hardware blinking with an on+off
+         period from 62ms to 125s. Say Y to enable LEDs on the HP iPAQ hx4700.
+
 config LEDS_TRIGGERS
        bool "LED Trigger support"
        depends on LEDS_CLASS

diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index bccb96c9bb45b467cbf14d0bf0c4e338796f8dce..bbfd2e367dc0e8a6b917c2c94b092bfa66bea35e 100644 (file)
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_LEDS_DELL_NETBOOKS)      += dell-led.o
 obj-$(CONFIG_LEDS_MC13783)             += leds-mc13783.o
 obj-$(CONFIG_LEDS_NS2)                 += leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)             += leds-netxbig.o
+obj-$(CONFIG_LEDS_ASIC3)               += leds-asic3.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)          += leds-dac124s085.o

diff --git a/drivers/leds/leds-asic3.c b/drivers/leds/leds-asic3.c
new file mode 100644 (file)
index 0000000..22f847c
--- /dev/null
+++ b/drivers/leds/leds-asic3.c
@@ -0,0 +1,165 @@
+/*
+ *  Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com>
+ *
+ *  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/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/asic3.h>
+#include <linux/mfd/core.h>
+
+/*
+ *     The HTC ASIC3 LED GPIOs are inputs, not outputs.
+ *     Hence we turn the LEDs on/off via the TimeBase register.
+ */
+
+/*
+ *     When TimeBase is 4 the clock resolution is about 32Hz.
+ *     This driver supports hardware blinking with an on+off
+ *     period from 62ms (2 clocks) to 125s (4000 clocks).
+ */
+#define MS_TO_CLK(ms)  DIV_ROUND_CLOSEST(((ms)*1024), 32000)
+#define CLK_TO_MS(clk) (((clk)*32000)/1024)
+#define MAX_CLK                4000            /* Fits into 12-bit Time registers */
+#define MAX_MS         CLK_TO_MS(MAX_CLK)
+
+static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
+       [0] = ASIC3_LED_0_Base,
+       [1] = ASIC3_LED_1_Base,
+       [2] = ASIC3_LED_2_Base,
+};
+
+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 asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+       u32 timebase;
+       unsigned int base;
+
+       timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4);
+
+       base = led_n_base[cell->id];
+       asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32);
+       asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32);
+       asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
+       asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase);
+}
+
+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 asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+       u32 on;
+       u32 off;
+       unsigned int base;
+
+       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;
+       }
+
+       base = led_n_base[cell->id];
+       asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off));
+       asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on);
+       asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
+       asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4));
+
+       *delay_on = CLK_TO_MS(on);
+       *delay_off = CLK_TO_MS(off);
+
+       return 0;
+}
+
+static int __devinit asic3_led_probe(struct platform_device *pdev)
+{
+       struct asic3_led *led = pdev->dev.platform_data;
+       int ret;
+
+       ret = mfd_cell_enable(pdev);
+       if (ret < 0)
+               goto ret0;
+
+       led->cdev = kzalloc(sizeof(struct led_classdev), GFP_KERNEL);
+       if (!led->cdev) {
+               ret = -ENOMEM;
+               goto ret1;
+       }
+
+       led->cdev->name = led->name;
+       led->cdev->default_trigger = led->default_trigger;
+       led->cdev->brightness_set = brightness_set;
+       led->cdev->blink_set = blink_set;
+
+       ret = led_classdev_register(&pdev->dev, led->cdev);
+       if (ret < 0)
+               goto ret2;
+
+       return 0;
+
+ret2:
+       kfree(led->cdev);
+ret1:
+       (void) mfd_cell_disable(pdev);
+ret0:
+       return ret;
+}
+
+static int __devexit asic3_led_remove(struct platform_device *pdev)
+{
+       struct asic3_led *led = pdev->dev.platform_data;
+
+       led_classdev_unregister(led->cdev);
+
+       kfree(led->cdev);
+
+       return mfd_cell_disable(pdev);
+}
+
+static struct platform_driver asic3_led_driver = {
+       .probe          = asic3_led_probe,
+       .remove         = __devexit_p(asic3_led_remove),
+       .driver         = {
+               .name   = "leds-asic3",
+               .owner  = THIS_MODULE,
+       },
+};
+
+MODULE_ALIAS("platform:leds-asic3");
+
+static int __init asic3_led_init(void)
+{
+       return platform_driver_register(&asic3_led_driver);
+}
+
+static void __exit asic3_led_exit(void)
+{
+       platform_driver_unregister(&asic3_led_driver);
+}
+
+module_init(asic3_led_init);
+module_exit(asic3_led_exit);
+
+MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
+MODULE_DESCRIPTION("HTC ASIC3 LED driver");
+MODULE_LICENSE("GPL");

diff --git a/include/linux/mfd/asic3.h b/include/linux/mfd/asic3.h
index de3c4ad19afb2def54bfceb28d2073d4d978b55f..d0dd3ebd848866d470112aae886d91d6945b8c6b 100644 (file)
--- a/include/linux/mfd/asic3.h
+++ b/include/linux/mfd/asic3.h
@@ -16,6 +16,13 @@
 
 #include <linux/types.h>
 
+struct led_classdev;
+struct asic3_led {
+       const char      *name;
+       const char      *default_trigger;
+       struct led_classdev *cdev;
+};
+
 struct asic3_platform_data {
        u16 *gpio_config;
        unsigned int gpio_config_num;
@@ -23,6 +30,8 @@ struct asic3_platform_data {
        unsigned int irq_base;
 
        unsigned int gpio_base;
+
+       struct asic3_led *leds;
 };
 
 #define ASIC3_NUM_GPIO_BANKS   4
@@ -111,9 +120,9 @@ struct asic3_platform_data {
 #define ASIC3_GPIOA11_PWM0             ASIC3_CONFIG_GPIO(11, 1, 1, 0)
 #define ASIC3_GPIOA12_PWM1             ASIC3_CONFIG_GPIO(12, 1, 1, 0)
 #define ASIC3_GPIOA15_CONTROL_CX       ASIC3_CONFIG_GPIO(15, 1, 1, 0)
-#define ASIC3_GPIOC0_LED0              ASIC3_CONFIG_GPIO(32, 1, 1, 0)
-#define ASIC3_GPIOC1_LED1              ASIC3_CONFIG_GPIO(33, 1, 1, 0)
-#define ASIC3_GPIOC2_LED2              ASIC3_CONFIG_GPIO(34, 1, 1, 0)
+#define ASIC3_GPIOC0_LED0              ASIC3_CONFIG_GPIO(32, 1, 0, 0)
+#define ASIC3_GPIOC1_LED1              ASIC3_CONFIG_GPIO(33, 1, 0, 0)
+#define ASIC3_GPIOC2_LED2              ASIC3_CONFIG_GPIO(34, 1, 0, 0)
 #define ASIC3_GPIOC3_SPI_RXD           ASIC3_CONFIG_GPIO(35, 1, 0, 0)
 #define ASIC3_GPIOC4_CF_nCD            ASIC3_CONFIG_GPIO(36, 1, 0, 0)
 #define ASIC3_GPIOC4_SPI_TXD           ASIC3_CONFIG_GPIO(36, 1, 1, 0)
@@ -152,6 +161,7 @@ struct asic3_platform_data {
 #define PWM_TIMEBASE_VALUE(x)    ((x)&0xf)   /* Low 4 bits sets time base */
 #define PWM_TIMEBASE_ENABLE     (1 << 4)   /* Enable clock */
 
+#define ASIC3_NUM_LEDS                  3
 #define ASIC3_LED_0_Base                0x0700
 #define ASIC3_LED_1_Base                0x0800
 #define ASIC3_LED_2_Base                     0x0900
@@ -293,4 +303,10 @@ struct asic3_platform_data {
 #define ASIC3_MAP_SIZE_32BIT   0x2000
 #define ASIC3_MAP_SIZE_16BIT   0x1000
 
+/* Functions needed by leds-asic3 */
+
+struct asic3;
+extern void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 val);
+extern u32 asic3_read_register(struct asic3 *asic, unsigned int reg);
+
 #endif /* __ASIC3_H__ */