[PATCH 1/3] mfd: ab8500-pwm: ab8500 pwm management
From: Arun Murthy
Date: Thu Aug 26 2010 - 03:23:04 EST
This patch exports functions to set and get ab8500 pwm intensity,
which in turn is used by backlight/led driver.
Signed-off-by: Arun Murthy <arun.murthy@xxxxxxxxxxxxxx>
Acked-by: Mattias Wallin <mattias.wallin@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
---
drivers/mfd/Kconfig | 8 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/ab8500-pwm.c | 191 +++++++++++++++++++++++++++++++++
include/linux/mfd/abx500/ab8500-pwm.h | 32 ++++++
4 files changed, 232 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/ab8500-pwm.c
create mode 100644 include/linux/mfd/abx500/ab8500-pwm.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 82d013f..6e73227 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -515,6 +515,14 @@ config AB3550_CORE
LEDs, vibrator, system power and temperature, power management
and ALSA sound.
+config AB8500_PWM
+ bool
+ depends on AB8500_CORE
+ help
+ This driver exports function to set and get AB8500 Pulse
+ Width Modulation pwm intensity in Analog Baseband chip AB8500.
+ It is used to control the led and lcd backlight intensity.
+
config MFD_TIMBERDALE
tristate "Support for the Timberdale FPGA"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 9aa8a2d..949c5bb 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_AB3550_CORE) += ab3550-core.o
obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-spi.o
obj-$(CONFIG_AB8500_I2C_CORE) += ab8500-i2c.o
obj-$(CONFIG_AB8500_DEBUG) += ab8500-debugfs.o
+obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
obj-$(CONFIG_LPC_SCH) += lpc_sch.o
diff --git a/drivers/mfd/ab8500-pwm.c b/drivers/mfd/ab8500-pwm.c
new file mode 100644
index 0000000..91eea95
--- /dev/null
+++ b/drivers/mfd/ab8500-pwm.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Arun R Murthy <arun.murthy@xxxxxxxxxxxxxx>
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#define KMSG_COMPONENT "ab8500-pwm"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/err.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500-pwm.h>
+
+/*
+ * PWM Out generators
+ * Bank: 0x10
+ */
+#define AB8500_PWM_OUT_CTRL1_REG 0x60
+#define AB8500_PWM_OUT_CTRL2_REG 0x61
+#define AB8500_PWM_OUT_CTRL3_REG 0x62
+#define AB8500_PWM_OUT_CTRL4_REG 0x63
+#define AB8500_PWM_OUT_CTRL5_REG 0x64
+#define AB8500_PWM_OUT_CTRL6_REG 0x65
+#define AB8500_PWM_OUT_CTRL7_REG 0x66
+
+/* backlight driver constants */
+#define DISABLE_PWM1 0
+#define DISABLE_PWM2 0
+#define DISABLE_PWM3 0
+#define ENABLE_PWM1 0x01
+#define ENABLE_PWM2 0x02
+#define ENABLE_PWM3 0x04
+
+/**
+ * ab8500_pwm_set_int() - set pwm intensity
+ * @dev: pointer the struct device
+ * @max_brightness: maximum brightness
+ * @intensity: pwm intensity to be set
+ * @pwm: pwm number for which intensity has to be set
+ */
+int ab8500_pwm_set_int(struct device *dev, unsigned int max_brightness,
+ unsigned int intensity, int pwm)
+{
+ int ret = 0;
+ unsigned int higher_val, lower_val, pwm_val;
+
+ /*
+ * DutyPWMOut[9:0]: 0000000000 = 1/1024; 0000000001 = 2/1024;..
+ * 1111111110 = 1023/1024; 1111111111 = 1024/1024.
+ */
+ pwm_val = ((1023 * intensity) / max_brightness);
+ /*
+ * get the first 8 bits that are be written to
+ * AB8500_PWM_OUT_CTRL1_REG[0:7]
+ */
+ lower_val = pwm_val & 0x00FF;
+ /*
+ * get bits [9:10] that are to be written to
+ * AB8500_PWM_OUT_CTRL2_REG[0:1]
+ */
+ higher_val = ((pwm_val & 0x0300) >> 8);
+ switch (pwm) {
+ case 1:
+ /* pwm-1 */
+ ret = abx500_mask_and_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ ENABLE_PWM1, ENABLE_PWM1);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL1_REG,
+ (u8)lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL2_REG,
+ (u8)higher_val);
+ break;
+ case 2:
+ /* pwm-2 */
+ ret = abx500_mask_and_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ ENABLE_PWM2, ENABLE_PWM2);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL3_REG,
+ (u8)lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL4_REG,
+ (u8)higher_val);
+ break;
+ case 3:
+ /* pwm-3 */
+ ret = abx500_mask_and_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ ENABLE_PWM3, ENABLE_PWM3);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL5_REG,
+ (u8)lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL6_REG,
+ (u8)higher_val);
+ break;
+ default:
+ pr_err("%s: invalid pwm entry = %d\n", __func__, pwm);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(ab8500_pwm_set_int);
+
+/**
+ * ab8500_pwm_get_int() - get pwm intensity
+ * @dev: pointer to the struct device
+ * @max_brightness: maximum brightness
+ * @pwm: pwm number for which intensity has to be obtained
+ */
+int ab8500_pwm_get_int(struct device *dev, int max_brightness, int pwm)
+{
+ u8 lower_val, higher_val;
+ unsigned int pwm_val;
+ int ret;
+
+ switch (pwm) {
+ case 1:
+ /* pwm-1 */
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL1_REG,
+ &lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL2_REG,
+ &higher_val);
+ if (ret < 0)
+ return ret;
+ break;
+ case 2:
+ /* pwm-2 */
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL3_REG,
+ &lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL4_REG,
+ &higher_val);
+ if (ret < 0)
+ return ret;
+ break;
+ case 3:
+ /* pwm-3 */
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL5_REG,
+ &lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_get_register_interruptible(dev,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL6_REG,
+ &higher_val);
+ if (ret < 0)
+ return ret;
+ break;
+ default:
+ pr_err("%s:invalid pwm entry = %d\n", __func__, pwm);
+ return -EINVAL;
+ };
+ /*
+ * PWM value is of 10bit length bits, hence combining the
+ * lower AB8500_PWM_OUT_CTRL1_REG and higher
+ * AB8500_PWM_OUT_CTRL2_REG register.
+ */
+ pwm_val = higher_val << 8 | lower_val;
+ /*
+ * DutyPWMOut[9:0]: 0000000000 = 1/1024; 0000000001 = 2/1024;..
+ * 1111111110 = 1023/1024; 1111111111 = 1024/1024.
+ */
+ pwm_val = (max_brightness * pwm_val) / 1023;
+
+ return pwm_val;
+}
+EXPORT_SYMBOL(ab8500_pwm_get_int);
diff --git a/include/linux/mfd/abx500/ab8500-pwm.h b/include/linux/mfd/abx500/ab8500-pwm.h
new file mode 100644
index 0000000..f891c70
--- /dev/null
+++ b/include/linux/mfd/abx500/ab8500-pwm.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Dushyanth S R <dushyanth.sr@xxxxxxxxxxxxxx>
+ * Author: Arun Murthy <arun.murthy@xxxxxxxxxxxxxx>
+ * License Terms: GNU General Public License v2
+ */
+#ifndef MFD_AB8500_PWM_H
+#define MFD_AB8500_PWM_H
+
+#define PWM1 1
+#define PWM2 2
+#define PWM3 3
+#define TOTAL_NO_PWM 3
+#define MAX_PWM_CTRL 2
+
+struct ab8500_pwm_pdata {
+ int pwm_no[MAX_PWM_CTRL];
+ int max_intensity;
+ char *name;
+};
+
+int ab8500_pwm_set_int(struct device *dev,
+ unsigned int max_brightness,
+ unsigned int intensity,
+ int pwm);
+
+int ab8500_pwm_get_int(struct device *dev,
+ int max_brightness,
+ int pwm);
+
+#endif /* MFD_AB8500_PWM_H */
--
1.6.3.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/