path: root/target/linux/s3c24xx/patches-2.6.24/1291-gta03-pca9632.patch.patch

From f6b1f49300a24c329f5d1049031f711c6268be95 Mon Sep 17 00:00:00 2001
From: Matt Hsu <matt_hsu@openmoko.org>
Date: Thu, 18 Sep 2008 11:14:50 +0100
Subject: [PATCH] gta03-pca9632.patch

 - pca9632 is a LED driver which will be adopted in gta03.

Signed-off-by: Matt Hsu <matt_hsu@openmoko.org>
---
 drivers/i2c/chips/Kconfig   |    9 +
 drivers/i2c/chips/Makefile  |    1 +
 drivers/i2c/chips/pca9632.c |  551 +++++++++++++++++++++++++++++++++++++++++++
 drivers/i2c/chips/pca9632.h |   24 ++
 include/linux/i2c-id.h      |    1 +
 5 files changed, 586 insertions(+), 0 deletions(-)
 create mode 100644 drivers/i2c/chips/pca9632.c
 create mode 100644 drivers/i2c/chips/pca9632.h

diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index 1d6d36f..9af3c62 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -193,4 +193,13 @@ config SENSORS_TSL256X
 	  This driver can also be built as a module.  If so, the module
 	  will be called tsl256x.
 
+config PCA9632
+	tristate "Philips/NXP PCA9632 low power LED driver"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Philips/NXP PCA9632
+	  LED driver.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called pca9632.
 endmenu
diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile
index 4b6ba04..67cd1e5 100644
--- a/drivers/i2c/chips/Makefile
+++ b/drivers/i2c/chips/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_TPS65010)		+= tps65010.o
 obj-$(CONFIG_MENELAUS)		+= menelaus.o
 obj-$(CONFIG_SENSORS_TSL2550)	+= tsl2550.o
 obj-$(CONFIG_SENSORS_TSL256X)	+= tsl256x.o
+obj-$(CONFIG_PCA9632)		+= pca9632.o
 
 ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/i2c/chips/pca9632.c b/drivers/i2c/chips/pca9632.c
new file mode 100644
index 0000000..deda6a1
--- /dev/null
+++ b/drivers/i2c/chips/pca9632.c
@@ -0,0 +1,551 @@
+/*
+ *  Philips/NXP PCA9632 low power LED driver.
+ *  Copyright (C) 2008 Matt Hsu <matt_hsu@openmoko.org>
+ *
+ *  low_level implementation are based on pcf50606 driver
+ *
+ *  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; version 2 of the License.
+ *
+ *  TODO:
+ *  - attach ledclass??
+ *  - add platform data
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+
+#include "pca9632.h"
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x62, I2C_CLIENT_END };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(pca9632);
+
+enum pca9632_pwr_state {
+	PCA9632_NORMAL,
+	PCA9632_SLEEP,
+};
+
+enum pca9632_led_output {
+	PCA9632_OFF,
+	PCA9632_ON,
+	PCA9632_CTRL_BY_PWM,
+	PCA9632_CTRL_BY_PWM_GRPPWM,
+};
+
+static const char *led_output_name[] = {
+	[PCA9632_OFF]  			= "off",
+	[PCA9632_ON]			= "fully-on",
+	[PCA9632_CTRL_BY_PWM] 		= "ctrl-by-pwm",
+	[PCA9632_CTRL_BY_PWM_GRPPWM] 	= "ctrl-by-pwm-grppwm",
+};
+
+struct pca9632_data {
+	struct i2c_client client;
+	struct mutex lock;
+};
+
+static struct i2c_driver pca9632_driver;
+static struct platform_device *pca9632_pdev;
+
+static int pca9632_attach_adapter(struct i2c_adapter *adapter);
+static int pca9632_detach_client(struct i2c_client *client);
+
+static int __reg_write(struct pca9632_data *pca, u_int8_t reg, u_int8_t val)
+{
+	return i2c_smbus_write_byte_data(&pca->client, reg, val);
+}
+
+static int reg_write(struct pca9632_data *pca, u_int8_t reg, u_int8_t val)
+{
+	int ret;
+
+	mutex_lock(&pca->lock);
+	ret = __reg_write(pca, reg, val);
+	mutex_unlock(&pca->lock);
+
+	return ret;
+}
+
+static int32_t __reg_read(struct pca9632_data *pca, u_int8_t reg)
+{
+	int32_t ret;
+
+	ret = i2c_smbus_read_byte_data(&pca->client, reg);
+
+	return ret;
+}
+
+static u_int8_t reg_read(struct pca9632_data *pca, u_int8_t reg)
+{
+	int32_t ret;
+
+	mutex_lock(&pca->lock);
+	ret = __reg_read(pca, reg);
+	mutex_unlock(&pca->lock);
+
+	return ret & 0xff;
+}
+
+static int reg_set_bit_mask(struct pca9632_data *pca,
+			    u_int8_t reg, u_int8_t mask, u_int8_t val)
+{
+	int ret;
+	u_int8_t tmp;
+
+	val &= mask;
+
+	mutex_lock(&pca->lock);
+
+	tmp = __reg_read(pca, reg);
+	tmp &= ~mask;
+	tmp |= val;
+	ret = __reg_write(pca, reg, tmp);
+
+	mutex_unlock(&pca->lock);
+
+	return ret;
+}
+
+static inline int calc_dc(uint8_t idc)
+{
+	return (idc * 100) / 256;
+}
+
+/*
+ * Software reset
+ */
+static int software_rst(struct i2c_adapter *adapter)
+{
+	u8 buf[] = { 0xa5, 0x5a };
+
+	struct i2c_msg msg[] = {
+		{
+			.addr = 0x3,
+			.flags = 0,
+			.buf = &buf,
+			.len = sizeof(buf)
+		}
+	};
+
+	return i2c_transfer(adapter, msg, 1);
+}
+
+/*
+ * Group dmblnk control
+ */
+static void config_group_dmblnk(struct pca9632_data *pca, int group_dmblnk_mode)
+{
+	reg_set_bit_mask(pca, PCA9632_REG_MODE2, 0x20,
+			group_dmblnk_mode << PCA9632_DMBLNK_SHIFT);
+}
+
+static int get_group_dmblnk(struct pca9632_data *pca)
+{
+	return reg_read(pca, PCA9632_REG_MODE2) >> PCA9632_DMBLNK_SHIFT;
+}
+
+static ssize_t show_group_dmblnk(struct device *dev, struct device_attribute
+					*attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+
+	if (get_group_dmblnk(pca))
+		return sprintf(buf, "blinking\n");
+	else
+		return sprintf(buf, "dimming\n");
+}
+
+static ssize_t set_group_dmblnk(struct device *dev, struct device_attribute
+					*attr, const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+	unsigned int mode = simple_strtoul(buf, NULL, 10);
+
+	if (mode)
+		dev_info(&pca->client.dev, "blinking\n");
+	else
+		dev_info(&pca->client.dev, "dimming\n");
+
+	config_group_dmblnk(pca, mode);
+
+	return count;
+}
+
+static DEVICE_ATTR(group_dmblnk, S_IRUGO | S_IWUSR, show_group_dmblnk,
+							set_group_dmblnk);
+
+static int reg_id_by_name(const char *name)
+{
+	int reg_id = -1;
+
+	if (!strncmp(name, "led0", 4))
+		reg_id = PCA9632_REG_PWM0;
+	else if (!strncmp(name, "led1", 4))
+		reg_id = PCA9632_REG_PWM1;
+	else if (!strncmp(name, "led2", 4))
+		reg_id = PCA9632_REG_PWM2;
+	else if (!strncmp(name, "led3", 4))
+		reg_id = PCA9632_REG_PWM3;
+
+	return reg_id;
+}
+
+static int get_led_output(struct pca9632_data *pca, int ldrx)
+{
+	u_int8_t led_state;
+
+	ldrx = ldrx - 2;
+	led_state = reg_read(pca, PCA9632_REG_LEDOUT);
+	led_state = (led_state >> (2 * ldrx)) & 0x03;
+
+	return led_state;
+}
+
+static void config_led_output(struct pca9632_data *pca, int ldrx,
+					enum pca9632_led_output led_output)
+{
+	u_int8_t mask;
+	int tmp;
+
+	ldrx = ldrx - 2;
+	mask = 0x03 << (2 * ldrx);
+	tmp = reg_set_bit_mask(pca, PCA9632_REG_LEDOUT,
+					mask, led_output << (2 * ldrx));
+}
+
+/*
+ * Individual brightness control
+ */
+static ssize_t show_brightness(struct device *dev, struct device_attribute
+					*attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+	int ldrx;
+
+	ldrx = reg_id_by_name(attr->attr.name);
+
+	switch (get_led_output(pca, ldrx)) {
+
+	case PCA9632_OFF:
+	case PCA9632_ON:
+		return sprintf(buf, "%s",
+			led_output_name[get_led_output(pca, ldrx)]);
+
+	case PCA9632_CTRL_BY_PWM:
+		return sprintf(buf, "%d%% \n", calc_dc(reg_read(pca, ldrx)));
+
+	case PCA9632_CTRL_BY_PWM_GRPPWM:
+		/* check group dmblnk */
+		if (get_group_dmblnk(pca))
+			return sprintf(buf, "%d%% \n",
+				calc_dc(reg_read(pca, ldrx)));
+		return sprintf(buf, "%d%% \n",
+					 calc_dc((reg_read(pca, ldrx) & 0xfc)));
+	default:
+		break;
+	}
+
+	return sprintf(buf, "invalid argument\n");
+}
+
+static ssize_t set_brightness(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+	unsigned int pwm = simple_strtoul(buf, NULL, 10);
+	int ldrx;
+
+	ldrx = reg_id_by_name(attr->attr.name);
+	reg_set_bit_mask(pca, ldrx, 0xff, pwm);
+
+	return count;
+}
+
+static
+DEVICE_ATTR(led0_pwm, S_IRUGO | S_IWUSR, show_brightness, set_brightness);
+static
+DEVICE_ATTR(led1_pwm, S_IRUGO | S_IWUSR, show_brightness, set_brightness);
+static
+DEVICE_ATTR(led2_pwm, S_IRUGO | S_IWUSR, show_brightness, set_brightness);
+static
+DEVICE_ATTR(led3_pwm, S_IRUGO | S_IWUSR, show_brightness, set_brightness);
+
+/*
+ * Group frequency control
+ */
+static ssize_t show_group_freq(struct device *dev, struct device_attribute
+				*attr, char *buf)
+{
+	uint32_t period;
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+
+	period = ((reg_read(pca, PCA9632_REG_GRPFREQ) + 1) * 1000) / 24;
+
+	return sprintf(buf, "%d ms\n", period);
+}
+
+static ssize_t set_group_freq(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+
+	unsigned int freq = simple_strtoul(buf, NULL, 10);
+	reg_write(pca, PCA9632_REG_GRPFREQ, freq);
+	return count;
+}
+
+static
+DEVICE_ATTR(group_freq, S_IRUGO | S_IWUSR, show_group_freq, set_group_freq);
+
+/*
+ * Group duty cycle tonrol*
+ */
+static ssize_t show_group_dc(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+
+	if (get_group_dmblnk(pca)) {
+
+		if (reg_read(pca, PCA9632_REG_GRPFREQ) <= 0x03)
+			return sprintf(buf, "%d%% \n",
+			     calc_dc(reg_read(pca, PCA9632_REG_GRPPWM) & 0xfc));
+
+		return sprintf(buf, "%d%% \n", calc_dc(reg_read(pca,
+							  PCA9632_REG_GRPPWM)));
+	}
+
+	return sprintf(buf, "%d%% \n", calc_dc(reg_read(pca,
+						   PCA9632_REG_GRPPWM) & 0xf0));
+}
+
+static ssize_t set_group_dc(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+
+	unsigned int dc = simple_strtoul(buf, NULL, 10);
+
+	reg_set_bit_mask(pca, PCA9632_REG_GRPPWM, 0xff, dc);
+
+	return count;
+}
+
+static DEVICE_ATTR(group_dc, S_IRUGO | S_IWUSR, show_group_dc, set_group_dc);
+
+/*
+ * LED driver output
+ */
+static ssize_t show_led_output(struct device *dev, struct device_attribute
+					*attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+	int ldrx;
+
+	ldrx = reg_id_by_name(attr->attr.name);
+
+	return sprintf(buf, "%s \n",
+				    led_output_name[get_led_output(pca, ldrx)]);
+
+}
+static ssize_t set_led_output(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct pca9632_data *pca = i2c_get_clientdata(client);
+	enum pca9632_led_output led_output;
+	int ldrx;
+
+	led_output = simple_strtoul(buf, NULL, 10);
+	ldrx = reg_id_by_name(attr->attr.name);
+	config_led_output(pca, ldrx, led_output);
+
+	return count;
+}
+
+static
+DEVICE_ATTR(led0_output, S_IRUGO | S_IWUSR, show_led_output, set_led_output);
+static
+DEVICE_ATTR(led1_output, S_IRUGO | S_IWUSR, show_led_output, set_led_output);
+static
+DEVICE_ATTR(led2_output, S_IRUGO | S_IWUSR, show_led_output, set_led_output);
+static
+DEVICE_ATTR(led3_output, S_IRUGO | S_IWUSR, show_led_output, set_led_output);
+
+static struct attribute *pca_sysfs_entries[] = {
+	&dev_attr_group_dmblnk.attr,
+	&dev_attr_led0_pwm.attr,
+	&dev_attr_led1_pwm.attr,
+	&dev_attr_led2_pwm.attr,
+	&dev_attr_led3_pwm.attr,
+	&dev_attr_group_dc.attr,
+	&dev_attr_group_freq.attr,
+	&dev_attr_led0_output.attr,
+	&dev_attr_led1_output.attr,
+	&dev_attr_led2_output.attr,
+	&dev_attr_led3_output.attr,
+	NULL
+};
+
+static struct attribute_group pca_attr_group = {
+	.name	= NULL,			/* put in device directory */
+	.attrs	= pca_sysfs_entries,
+};
+
+#ifdef CONFIG_PM
+static int pca9632_suspend(struct device *dev, pm_message_t state)
+{
+	/* FIXME: Not implemented */
+	return 0;
+}
+
+static int pca9632_resume(struct device *dev)
+{
+	/* FIXME: Not implemented */
+	return 0;
+}
+#else
+#define pca9632_suspend NULL
+#define pca9632_resume NULL
+#endif
+
+static struct i2c_driver pca9632_driver = {
+	.driver = {
+		.name	 = "pca9632",
+		.suspend = pca9632_suspend,
+		.resume	 = pca9632_resume,
+	},
+	.id		= I2C_DRIVERID_PCA9632,
+	.attach_adapter	= pca9632_attach_adapter,
+	.detach_client	= pca9632_detach_client,
+};
+
+static int pca9632_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *new_client;
+	struct pca9632_data *pca;
+	int err;
+
+	pca = kzalloc(sizeof(struct pca9632_data), GFP_KERNEL);
+	if (!pca)
+		return -ENOMEM;
+
+	mutex_init(&pca->lock);
+
+	new_client = &pca->client;
+	i2c_set_clientdata(new_client, pca);
+	new_client->addr = address;
+	new_client->adapter = adapter;
+	new_client->driver = &pca9632_driver;
+	new_client->flags = 0;
+
+	strlcpy(new_client->name, "pca9632", I2C_NAME_SIZE);
+
+	/* register with i2c core */
+	err = i2c_attach_client(new_client);
+	if (err)
+		goto exit_kfree;
+
+	err = sysfs_create_group(&new_client->dev.kobj, &pca_attr_group);
+	if (err)
+		goto exit_detach;
+
+	/* software reset */
+	if (!software_rst(adapter))
+		dev_info(&pca->client.dev, "pca9632 sw-rst done\n");
+
+	/* enter normal mode */
+	reg_set_bit_mask(pca, PCA9632_REG_MODE1, 0x10, PCA9632_NORMAL);
+
+	return 0;
+
+exit_detach:
+	i2c_detach_client(new_client);
+exit_kfree:
+	kfree(pca);
+
+	return err;
+}
+
+static int pca9632_attach_adapter(struct i2c_adapter *adapter)
+{
+	return i2c_probe(adapter, &addr_data, pca9632_detect);
+}
+
+static int pca9632_detach_client(struct i2c_client *client)
+{
+	int err;
+
+	sysfs_remove_group(&client->dev.kobj, &pca_attr_group);
+	err = i2c_detach_client(client);
+
+	if (err)
+		return err;
+
+	kfree(i2c_get_clientdata(client));
+
+	return 0;
+}
+
+static int __init pca9632_plat_probe(struct platform_device *pdev)
+{
+	/* FIXME: platform data should be attached here */
+	pca9632_pdev = pdev;
+
+	return 0;
+}
+
+static int pca9632_plat_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver pca9632_plat_driver = {
+	.probe	= pca9632_plat_probe,
+	.remove	= pca9632_plat_remove,
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name 	= "pca9632",
+	},
+};
+
+static int __init pca9632_init(void)
+{
+	int rc;
+
+	rc = platform_driver_register(&pca9632_plat_driver);
+	if (!rc)
+		i2c_add_driver(&pca9632_driver);
+
+	return rc;
+}
+
+static void __exit pca9632_exit(void)
+{
+	i2c_del_driver(&pca9632_driver);
+
+	platform_driver_unregister(&pca9632_plat_driver);
+}
+
+MODULE_AUTHOR("Matt Hsu <matt_hsu@openmoko.org>");
+MODULE_DESCRIPTION("NXP PCA9632 driver");
+MODULE_LICENSE("GPL");
+
+module_init(pca9632_init);
+module_exit(pca9632_exit);
diff --git a/drivers/i2c/chips/pca9632.h b/drivers/i2c/chips/pca9632.h
new file mode 100644
index 0000000..be2892e
--- /dev/null
+++ b/drivers/i2c/chips/pca9632.h
@@ -0,0 +1,24 @@
+#ifndef _PCA9632_H
+#define _PCA9632_H
+
+
+enum pca9632_regs{
+
+	PCA9632_REG_MODE1 	= 0x00,
+	PCA9632_REG_MODE2 	= 0x01,
+	PCA9632_REG_PWM0 	= 0x02,
+	PCA9632_REG_PWM1 	= 0x03,
+	PCA9632_REG_PWM2 	= 0x04,
+	PCA9632_REG_PWM3 	= 0x05,
+	PCA9632_REG_GRPPWM 	= 0x06,
+	PCA9632_REG_GRPFREQ 	= 0x07,
+	PCA9632_REG_LEDOUT 	= 0x08,
+	PCA9632_REG_SUBADDR1 	= 0x09,
+	PCA9632_REG_SUBADDR2 	= 0x0a,
+	PCA9632_REG_SUBADDR3 	= 0x0b,
+	PCA9632_REG_ALLCALLADR1 = 0x0c,
+};
+
+#define PCA9632_DMBLNK_SHIFT 	5
+
+#endif /* _PCA9632_H */
diff --git a/include/linux/i2c-id.h b/include/linux/i2c-id.h
index ee60156..d5a63fe 100644
--- a/include/linux/i2c-id.h
+++ b/include/linux/i2c-id.h
@@ -170,6 +170,7 @@
 #define I2C_DRIVERID_PCF50606 1049
 #define I2C_DRIVERID_TSL256X 1050
 #define I2C_DRIVERID_PCF50633 1051
+#define I2C_DRIVERID_PCA9632  1052
 
 /*
  * ---- Adapter types ----------------------------------------------------
-- 
1.5.6.5