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Subject[PATCH v3] mfd: Add ASIC3 LED support
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Date
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>
---
diff -uprN clean-2.6.39-rc6/drivers/leds/Kconfig linux-2.6.39-rc6/drivers/leds/Kconfig
--- clean-2.6.39-rc6/drivers/leds/Kconfig 2011-05-04 12:09:11.510511473 +0100
+++ linux-2.6.39-rc6/drivers/leds/Kconfig 2011-05-04 12:07:21.678511518 +0100
@@ -379,6 +379,16 @@ 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 -uprN clean-2.6.39-rc6/drivers/leds/Makefile linux-2.6.39-rc6/drivers/leds/Makefile
--- clean-2.6.39-rc6/drivers/leds/Makefile 2011-05-04 12:09:11.510511473 +0100
+++ linux-2.6.39-rc6/drivers/leds/Makefile 2011-05-04 12:07:21.678511518 +0100
@@ -42,6 +42,7 @@ obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell
obj-$(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 -uprN clean-2.6.39-rc6/drivers/leds/leds-asic3.c linux-2.6.39-rc6/drivers/leds/leds-asic3.c
--- clean-2.6.39-rc6/drivers/leds/leds-asic3.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.39-rc6/drivers/leds/leds-asic3.c 2011-05-09 21:29:18.300771352 +0100
@@ -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 -uprN clean-2.6.39-rc6/drivers/mfd/asic3.c linux-2.6.39-rc6/drivers/mfd/asic3.c
--- clean-2.6.39-rc6/drivers/mfd/asic3.c 2011-05-04 12:09:12.362511473 +0100
+++ linux-2.6.39-rc6/drivers/mfd/asic3.c 2011-05-09 21:39:09.896673035 +0100
@@ -88,19 +88,19 @@ struct asic3 {

static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);

-static inline void asic3_write_register(struct asic3 *asic,
- unsigned int reg, u32 value)
+void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value)
{
iowrite16(value, asic->mapping +
(reg >> asic->bus_shift));
}
+EXPORT_SYMBOL_GPL(asic3_write_register);

-static inline u32 asic3_read_register(struct asic3 *asic,
- unsigned int reg)
+u32 asic3_read_register(struct asic3 *asic, unsigned int reg)
{
return ioread16(asic->mapping +
(reg >> asic->bus_shift));
}
+EXPORT_SYMBOL_GPL(asic3_read_register);

static void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
{
@@ -782,7 +782,55 @@ static struct mfd_cell asic3_cell_mmc =
.resources = asic3_mmc_resources,
};

+static const int clock_ledn[ASIC3_NUM_LEDS] = {
+ [0] = ASIC3_CLOCK_LED0,
+ [1] = ASIC3_CLOCK_LED1,
+ [2] = ASIC3_CLOCK_LED2,
+};
+
+static int asic3_leds_enable(struct platform_device *pdev)
+{
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+
+ asic3_clk_enable(asic, &asic->clocks[clock_ledn[cell->id]]);
+
+ return 0;
+}
+
+static int asic3_leds_disable(struct platform_device *pdev)
+{
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+
+ asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
+
+ return 0;
+}
+
+static struct mfd_cell asic3_cell_leds[ASIC3_NUM_LEDS] = {
+ [0] = {
+ .name = "leds-asic3",
+ .id = 0,
+ .enable = asic3_leds_enable,
+ .disable = asic3_leds_disable,
+ },
+ [1] = {
+ .name = "leds-asic3",
+ .id = 1,
+ .enable = asic3_leds_enable,
+ .disable = asic3_leds_disable,
+ },
+ [2] = {
+ .name = "leds-asic3",
+ .id = 2,
+ .enable = asic3_leds_enable,
+ .disable = asic3_leds_disable,
+ },
+};
+
static int __init asic3_mfd_probe(struct platform_device *pdev,
+ struct asic3_platform_data *pdata,
struct resource *mem)
{
struct asic3 *asic = platform_get_drvdata(pdev);
@@ -820,9 +868,23 @@ static int __init asic3_mfd_probe(struct
if (ret < 0)
goto out;

- if (mem_sdio && (irq >= 0))
+ if (mem_sdio && (irq >= 0)) {
ret = mfd_add_devices(&pdev->dev, pdev->id,
&asic3_cell_mmc, 1, mem_sdio, irq);
+ if (ret < 0)
+ goto out;
+ }
+
+ if (pdata->leds) {
+ int i;
+
+ for (i = 0; i < ASIC3_NUM_LEDS; ++i) {
+ asic3_cell_leds[i].platform_data = &pdata->leds[i];
+ asic3_cell_leds[i].pdata_size = sizeof(pdata->leds[i]);
+ }
+ ret = mfd_add_devices(&pdev->dev, 0,
+ asic3_cell_leds, ASIC3_NUM_LEDS, NULL, 0);
+ }

out:
return ret;
@@ -903,7 +965,7 @@ static int __init asic3_probe(struct pla
*/
memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));

- asic3_mfd_probe(pdev, mem);
+ asic3_mfd_probe(pdev, pdata, mem);

dev_info(asic->dev, "ASIC3 Core driver\n");

diff -uprN clean-2.6.39-rc6/include/linux/mfd/asic3.h linux-2.6.39-rc6/include/linux/mfd/asic3.h
--- clean-2.6.39-rc6/include/linux/mfd/asic3.h 2011-03-15 01:20:32.000000000 +0000
+++ linux-2.6.39-rc6/include/linux/mfd/asic3.h 2011-05-04 19:11:55.746501185 +0100
@@ -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__ */


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