[PATCHv3 6/7] pwm: move existing pwm driver to drivers/pwm
Arun Murthy
arun.murthy at stericsson.com
Wed Oct 6 11:59:17 EDT 2010
As of now only ab8500 and twl6030 are moved.
Signed-off-by: Arun Murthy <arun.murthy at stericsson.com>
Acked-by: Linus Walleij <linus.walleij at stericsson.com>
---
drivers/mfd/Kconfig | 9 --
drivers/mfd/Makefile | 1 -
drivers/mfd/twl6030-pwm.c | 195 ---------------------------------------------
drivers/misc/Kconfig | 9 --
drivers/misc/Makefile | 1 -
drivers/misc/ab8500-pwm.c | 157 ------------------------------------
drivers/pwm/Kconfig | 18 ++++
drivers/pwm/Makefile | 3 +
drivers/pwm/pwm-ab8500.c | 157 ++++++++++++++++++++++++++++++++++++
drivers/pwm/pwm-twl6030.c | 195 +++++++++++++++++++++++++++++++++++++++++++++
10 files changed, 373 insertions(+), 372 deletions(-)
delete mode 100644 drivers/mfd/twl6030-pwm.c
delete mode 100644 drivers/misc/ab8500-pwm.c
create mode 100644 drivers/pwm/pwm-ab8500.c
create mode 100644 drivers/pwm/pwm-twl6030.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 82d013f..ed4359a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -186,15 +186,6 @@ config TWL4030_CODEC
select MFD_CORE
default n
-config TWL6030_PWM
- tristate "TWL6030 PWM (Pulse Width Modulator) Support"
- depends on TWL4030_CORE
- select HAVE_PWM
- default n
- help
- Say yes here if you want support for TWL6030 PWM.
- This is used to control charging LED brightness.
-
config MFD_STMPE
bool "Support STMicroelectronics STMPE"
depends on I2C=y && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 9aa8a2d..a66f2a7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -37,7 +37,6 @@ obj-$(CONFIG_MENELAUS) += menelaus.o
obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
obj-$(CONFIG_TWL4030_CODEC) += twl4030-codec.o
-obj-$(CONFIG_TWL6030_PWM) += twl6030-pwm.o
obj-$(CONFIG_MFD_MC13783) += mc13783-core.o
diff --git a/drivers/mfd/twl6030-pwm.c b/drivers/mfd/twl6030-pwm.c
deleted file mode 100644
index 7091df9..0000000
--- a/drivers/mfd/twl6030-pwm.c
+++ /dev/null
@@ -1,195 +0,0 @@
-/*
- * twl6030_pwm.c
- * Driver for PHOENIX (TWL6030) Pulse Width Modulator
- *
- * Copyright (C) 2010 Texas Instruments
- * Author: Hemanth V <hemanthv at ti.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.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/pwm.h>
-#include <linux/err.h>
-#include <linux/i2c/twl.h>
-
-#define LED_PWM_CTRL1 0xF4
-#define LED_PWM_CTRL2 0xF5
-
-/* Max value for CTRL1 register */
-#define PWM_CTRL1_MAX 255
-
-/* Pull down disable */
-#define PWM_CTRL2_DIS_PD (1 << 6)
-
-/* Current control 2.5 milli Amps */
-#define PWM_CTRL2_CURR_02 (2 << 4)
-
-/* LED supply source */
-#define PWM_CTRL2_SRC_VAC (1 << 2)
-
-/* LED modes */
-#define PWM_CTRL2_MODE_HW (0 << 0)
-#define PWM_CTRL2_MODE_SW (1 << 0)
-#define PWM_CTRL2_MODE_DIS (2 << 0)
-
-#define PWM_CTRL2_MODE_MASK 0x3
-
-int twl6030_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
-{
- u8 duty_cycle;
- int ret = 0;
-
- if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
- return -EINVAL;
-
- duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns;
-
- ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, duty_cycle, LED_PWM_CTRL1);
-
- if (ret < 0) {
- pr_err("%s: Failed to configure PWM, Error %d\n",
- pwm->label, ret);
- return ret;
- }
- return 0;
-}
-
-int twl6030_pwm_enable(struct pwm_device *pwm)
-{
- u8 val;
- int ret = 0;
-
- ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
- if (ret < 0) {
- pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
- return ret;
- }
-
- /* Change mode to software control */
- val &= ~PWM_CTRL2_MODE_MASK;
- val |= PWM_CTRL2_MODE_SW;
-
- ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
- if (ret < 0) {
- pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
- return ret;
- }
-
- twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
- return 0;
-}
-
-int twl6030_pwm_disable(struct pwm_device *pwm)
-{
- u8 val;
- int ret = 0;
-
- ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
- if (ret < 0) {
- pr_err("%s: Failed to disable PWM, Error %d\n",
- pwm->label, ret);
- return ret;
- }
-
- val &= ~PWM_CTRL2_MODE_MASK;
- val |= PWM_CTRL2_MODE_HW;
-
- ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
- if (ret < 0) {
- pr_err("%s: Failed to disable PWM, Error %d\n",
- pwm->label, ret);
- }
- return ret;
-}
-
-static int __devinit twl6030_pwm_probe(struct platform_device *pdev)
-{
- struct pwm_device *pwm;
- struct pwm_ops *pops;
- int ret;
- u8 val;
-
- pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
- if (pwm == NULL) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- return -ENOMEM;
- }
- pops = kzalloc(sizeof(struct pwm_ops), GFP_KERNEL);
- if (pops == NULL) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- kfree(pwm);
- return -ENOMEM;
- }
-
- pops->pwm_config = twl6030_pwm_config;
- pops->pwm_enable = twl6030_pwm_enable;
- pops->pwm_disable = twl6030_pwm_disable;
- pwm->name = &pdev->name;
- pwm->pwm_id = pdev->id;
- pwm->pops = pops;
- ret = pwm_device_register(pwm);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to register pwm device\n");
- kfree(pwm);
- kfree(pops);
- return ret;
- }
- platform_set_drvdata(pdev, pwm);
- /* Configure PWM */
- val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC |
- PWM_CTRL2_MODE_HW;
-
- ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
- if (ret < 0) {
- dev_err(&pdev->dev, "Failed to configure PWM, Error %d\n", ret);
- return ret;
- }
- dev_dbg(&pdev->dev, "pwm probe successful\n");
- return ret;
-}
-
-static int __devexit twl6030_pwm_remove(struct platform_device *pdev)
-{
- struct pwm_device *pwm = platform_get_drvdata(pdev);
-
- pwm_device_unregister(pwm);
- kfree(pwm->pops);
- kfree(pwm);
- dev_dbg(&pdev->dev, "pwm driver removed\n");
- return 0;
-}
-
-static struct platform_driver twl6030_pwm_driver = {
- .driver = {
- .name = "twl6030_pwm",
- .owner = THIS_MODULE,
- },
- .probe = twl6030_pwm_probe,
- .remove = __devexit_p(twl6030_pwm_remove),
-};
-
-static int __init twl6030_pwm_init(void)
-{
- return platform_driver_register(&twl6030_pwm_driver);
-}
-
-static void __exit twl6030_pwm_deinit(void)
-{
- platform_driver_unregister(&twl6030_pwm_driver);
-}
-
-subsys_initcall(twl6030_pwm_init);
-module_exit(twl6030_pwm_deinit);
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fcf2e7f..9df5b75 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -62,15 +62,6 @@ config ATMEL_PWM
purposes including software controlled power-efficient backlights
on LCD displays, motor control, and waveform generation.
-config AB8500_PWM
- bool "AB8500 PWM support"
- depends on AB8500_CORE
- select HAVE_PWM
- help
- This driver exports functions to enable/disble/config/free Pulse
- Width Modulation in the Ananlog Baseband Chip AB8500.
- It is used by led and backlight driver to control the intensity.
-
config ATMEL_TCLIB
bool "Atmel AT32/AT91 Timer/Counter Library"
depends on (AVR32 || ARCH_AT91)
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 33bc441..255a80d 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -35,4 +35,3 @@ obj-y += eeprom/
obj-y += cb710/
obj-$(CONFIG_VMWARE_BALLOON) += vmware_balloon.o
obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
-obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
diff --git a/drivers/misc/ab8500-pwm.c b/drivers/misc/ab8500-pwm.c
deleted file mode 100644
index 25f9310..0000000
--- a/drivers/misc/ab8500-pwm.c
+++ /dev/null
@@ -1,157 +0,0 @@
-/*
- * Copyright (C) ST-Ericsson SA 2010
- *
- * Author: Arun R Murthy <arun.murthy at stericsson.com>
- * License terms: GNU General Public License (GPL) version 2
- */
-#include <linux/err.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/pwm.h>
-#include <linux/mfd/ab8500.h>
-#include <linux/mfd/abx500.h>
-
-/*
- * PWM Out generators
- * Bank: 0x10
- */
-#define AB8500_PWM_OUT_CTRL1_REG 0x60
-#define AB8500_PWM_OUT_CTRL2_REG 0x61
-#define AB8500_PWM_OUT_CTRL7_REG 0x66
-
-/* backlight driver constants */
-#define ENABLE_PWM 1
-#define DISABLE_PWM 0
-
-static struct device *parent;
-
-int ab8500_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
-{
- int ret = 0;
- unsigned int higher_val, lower_val;
- u8 reg;
-
- /*
- * get the first 8 bits that are be written to
- * AB8500_PWM_OUT_CTRL1_REG[0:7]
- */
- lower_val = duty_ns & 0x00FF;
- /*
- * get bits [9:10] that are to be written to
- * AB8500_PWM_OUT_CTRL2_REG[0:1]
- */
- higher_val = ((duty_ns & 0x0300) >> 8);
-
- reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2);
-
- ret = abx500_set_register_interruptible(parent, AB8500_MISC,
- reg, (u8)lower_val);
- if (ret < 0)
- return ret;
- ret = abx500_set_register_interruptible(parent, AB8500_MISC,
- (reg + 1), (u8)higher_val);
-
- return ret;
-}
-
-int ab8500_pwm_enable(struct pwm_device *pwm)
-{
- int ret;
-
- ret = abx500_mask_and_set_register_interruptible(parent,
- AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
- 1 << (pwm->pwm_id-1), 1 << (pwm->pwm_id-1));
- if (ret < 0)
- dev_err(pwm->dev, "%s: Failed to enable PWM, Error %d\n",
- pwm->name, ret);
- return ret;
-}
-
-int ab8500_pwm_disable(struct pwm_device *pwm)
-{
- int ret;
-
- ret = abx500_mask_and_set_register_interruptible(parent,
- AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
- 1 << (pwm->pwm_id-1), DISABLE_PWM);
- if (ret < 0)
- dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
- pwm->name, ret);
- return ret;
-}
-
-static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
-{
- int ret = 0;
- struct pwm_ops *pops;
- struct pwm_device *pwm_dev;
- /*
- * Nothing to be done in probe, this is required to get the
- * device which is required for ab8500 read and write
- */
- pops = kzalloc(sizeof(struct pwm_ops), GFP_KERNEL);
- if (pops == NULL) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- return -ENOMEM;
- }
- pwm_dev = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
- if (pwm_dev == NULL) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- kfree(pops);
- return -ENOMEM;
- }
- parent = &pdev->dev;
- pops->pwm_config = ab8500_pwm_config;
- pops->pwm_enable = ab8500_pwm_enable;
- pops->pwm_disable = ab8500_pwm_disable;
- pwm_dev->name = "ab8500";
- pwm_dev->pwm_id = pdev->id;
- pwm_dev->pops = pops;
- ret = pwm_device_register(parent, pwm_dev);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to register pwm device\n");
- kfree(pwm_dev);
- kfree(pops);
- return ret;
- }
- platform_set_drvdata(pdev, pwm_dev);
- dev_dbg(&pdev->dev, "pwm probe successful\n");
- return ret;
-}
-
-static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
-{
- struct pwm_device *pwm_dev = platform_get_drvdata(pdev);
-
- pwm_device_unregister(pwm_dev);
- dev_dbg(&pdev->dev, "pwm driver removed\n");
- kfree(pwm_dev->pops);
- kfree(pwm_dev);
- return 0;
-}
-
-static struct platform_driver ab8500_pwm_driver = {
- .driver = {
- .name = "ab8500-pwm",
- .owner = THIS_MODULE,
- },
- .probe = ab8500_pwm_probe,
- .remove = __devexit_p(ab8500_pwm_remove),
-};
-
-static int __init ab8500_pwm_init(void)
-{
- return platform_driver_register(&ab8500_pwm_driver);
-}
-
-static void __exit ab8500_pwm_exit(void)
-{
- platform_driver_unregister(&ab8500_pwm_driver);
-}
-
-subsys_initcall(ab8500_pwm_init);
-module_exit(ab8500_pwm_exit);
-MODULE_AUTHOR("Arun MURTHY <arun.murthy at stericsson.com>");
-MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
-MODULE_ALIAS("AB8500 PWM driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 5483b7f..e4ef199 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -16,4 +16,22 @@ menuconfig PWM_DEVICES
if PWM_DEVICES
+config AB8500_PWM
+ bool "AB8500 PWM support"
+ depends on AB8500_CORE
+ select HAVE_PWM
+ help
+ This driver exports functions to enable/disble/config/free Pulse
+ Width Modulation in the Analog Baseband Chip AB8500.
+ It is used by led and backlight driver to control the intensity.
+
+config TWL6030_PWM
+ tristate "TWL6030 PWM (Pulse Width Modulator) Support"
+ depends on TWL4030_CORE
+ select HAVE_PWM
+ default n
+ help
+ Say yes here if you want support for TWL6030 PWM.
+ This is used to control charging LED brightness.
+
endif # PWM_DEVICES
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 552f969..f35afb4 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -1 +1,4 @@
obj-$(CONFIG_PWM_DEVICES) += pwm-core.o
+
+obj-$(CONFIG_AB8500_PWM) += pwm-ab8500.o
+obj-$(CONFIG_TWL6030_PWM) += pwm-twl6030.o
diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c
new file mode 100644
index 0000000..25f9310
--- /dev/null
+++ b/drivers/pwm/pwm-ab8500.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Arun R Murthy <arun.murthy at stericsson.com>
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pwm.h>
+#include <linux/mfd/ab8500.h>
+#include <linux/mfd/abx500.h>
+
+/*
+ * PWM Out generators
+ * Bank: 0x10
+ */
+#define AB8500_PWM_OUT_CTRL1_REG 0x60
+#define AB8500_PWM_OUT_CTRL2_REG 0x61
+#define AB8500_PWM_OUT_CTRL7_REG 0x66
+
+/* backlight driver constants */
+#define ENABLE_PWM 1
+#define DISABLE_PWM 0
+
+static struct device *parent;
+
+int ab8500_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ int ret = 0;
+ unsigned int higher_val, lower_val;
+ u8 reg;
+
+ /*
+ * get the first 8 bits that are be written to
+ * AB8500_PWM_OUT_CTRL1_REG[0:7]
+ */
+ lower_val = duty_ns & 0x00FF;
+ /*
+ * get bits [9:10] that are to be written to
+ * AB8500_PWM_OUT_CTRL2_REG[0:1]
+ */
+ higher_val = ((duty_ns & 0x0300) >> 8);
+
+ reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2);
+
+ ret = abx500_set_register_interruptible(parent, AB8500_MISC,
+ reg, (u8)lower_val);
+ if (ret < 0)
+ return ret;
+ ret = abx500_set_register_interruptible(parent, AB8500_MISC,
+ (reg + 1), (u8)higher_val);
+
+ return ret;
+}
+
+int ab8500_pwm_enable(struct pwm_device *pwm)
+{
+ int ret;
+
+ ret = abx500_mask_and_set_register_interruptible(parent,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ 1 << (pwm->pwm_id-1), 1 << (pwm->pwm_id-1));
+ if (ret < 0)
+ dev_err(pwm->dev, "%s: Failed to enable PWM, Error %d\n",
+ pwm->name, ret);
+ return ret;
+}
+
+int ab8500_pwm_disable(struct pwm_device *pwm)
+{
+ int ret;
+
+ ret = abx500_mask_and_set_register_interruptible(parent,
+ AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
+ 1 << (pwm->pwm_id-1), DISABLE_PWM);
+ if (ret < 0)
+ dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
+ pwm->name, ret);
+ return ret;
+}
+
+static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct pwm_ops *pops;
+ struct pwm_device *pwm_dev;
+ /*
+ * Nothing to be done in probe, this is required to get the
+ * device which is required for ab8500 read and write
+ */
+ pops = kzalloc(sizeof(struct pwm_ops), GFP_KERNEL);
+ if (pops == NULL) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
+ pwm_dev = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
+ if (pwm_dev == NULL) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ kfree(pops);
+ return -ENOMEM;
+ }
+ parent = &pdev->dev;
+ pops->pwm_config = ab8500_pwm_config;
+ pops->pwm_enable = ab8500_pwm_enable;
+ pops->pwm_disable = ab8500_pwm_disable;
+ pwm_dev->name = "ab8500";
+ pwm_dev->pwm_id = pdev->id;
+ pwm_dev->pops = pops;
+ ret = pwm_device_register(parent, pwm_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register pwm device\n");
+ kfree(pwm_dev);
+ kfree(pops);
+ return ret;
+ }
+ platform_set_drvdata(pdev, pwm_dev);
+ dev_dbg(&pdev->dev, "pwm probe successful\n");
+ return ret;
+}
+
+static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
+{
+ struct pwm_device *pwm_dev = platform_get_drvdata(pdev);
+
+ pwm_device_unregister(pwm_dev);
+ dev_dbg(&pdev->dev, "pwm driver removed\n");
+ kfree(pwm_dev->pops);
+ kfree(pwm_dev);
+ return 0;
+}
+
+static struct platform_driver ab8500_pwm_driver = {
+ .driver = {
+ .name = "ab8500-pwm",
+ .owner = THIS_MODULE,
+ },
+ .probe = ab8500_pwm_probe,
+ .remove = __devexit_p(ab8500_pwm_remove),
+};
+
+static int __init ab8500_pwm_init(void)
+{
+ return platform_driver_register(&ab8500_pwm_driver);
+}
+
+static void __exit ab8500_pwm_exit(void)
+{
+ platform_driver_unregister(&ab8500_pwm_driver);
+}
+
+subsys_initcall(ab8500_pwm_init);
+module_exit(ab8500_pwm_exit);
+MODULE_AUTHOR("Arun MURTHY <arun.murthy at stericsson.com>");
+MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
+MODULE_ALIAS("AB8500 PWM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pwm/pwm-twl6030.c b/drivers/pwm/pwm-twl6030.c
new file mode 100644
index 0000000..7091df9
--- /dev/null
+++ b/drivers/pwm/pwm-twl6030.c
@@ -0,0 +1,195 @@
+/*
+ * twl6030_pwm.c
+ * Driver for PHOENIX (TWL6030) Pulse Width Modulator
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv at ti.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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pwm.h>
+#include <linux/err.h>
+#include <linux/i2c/twl.h>
+
+#define LED_PWM_CTRL1 0xF4
+#define LED_PWM_CTRL2 0xF5
+
+/* Max value for CTRL1 register */
+#define PWM_CTRL1_MAX 255
+
+/* Pull down disable */
+#define PWM_CTRL2_DIS_PD (1 << 6)
+
+/* Current control 2.5 milli Amps */
+#define PWM_CTRL2_CURR_02 (2 << 4)
+
+/* LED supply source */
+#define PWM_CTRL2_SRC_VAC (1 << 2)
+
+/* LED modes */
+#define PWM_CTRL2_MODE_HW (0 << 0)
+#define PWM_CTRL2_MODE_SW (1 << 0)
+#define PWM_CTRL2_MODE_DIS (2 << 0)
+
+#define PWM_CTRL2_MODE_MASK 0x3
+
+int twl6030_pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ u8 duty_cycle;
+ int ret = 0;
+
+ if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
+ return -EINVAL;
+
+ duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns;
+
+ ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, duty_cycle, LED_PWM_CTRL1);
+
+ if (ret < 0) {
+ pr_err("%s: Failed to configure PWM, Error %d\n",
+ pwm->label, ret);
+ return ret;
+ }
+ return 0;
+}
+
+int twl6030_pwm_enable(struct pwm_device *pwm)
+{
+ u8 val;
+ int ret = 0;
+
+ ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
+ return ret;
+ }
+
+ /* Change mode to software control */
+ val &= ~PWM_CTRL2_MODE_MASK;
+ val |= PWM_CTRL2_MODE_SW;
+
+ ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
+ return ret;
+ }
+
+ twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
+ return 0;
+}
+
+int twl6030_pwm_disable(struct pwm_device *pwm)
+{
+ u8 val;
+ int ret = 0;
+
+ ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ pr_err("%s: Failed to disable PWM, Error %d\n",
+ pwm->label, ret);
+ return ret;
+ }
+
+ val &= ~PWM_CTRL2_MODE_MASK;
+ val |= PWM_CTRL2_MODE_HW;
+
+ ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ pr_err("%s: Failed to disable PWM, Error %d\n",
+ pwm->label, ret);
+ }
+ return ret;
+}
+
+static int __devinit twl6030_pwm_probe(struct platform_device *pdev)
+{
+ struct pwm_device *pwm;
+ struct pwm_ops *pops;
+ int ret;
+ u8 val;
+
+ pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
+ if (pwm == NULL) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
+ pops = kzalloc(sizeof(struct pwm_ops), GFP_KERNEL);
+ if (pops == NULL) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ kfree(pwm);
+ return -ENOMEM;
+ }
+
+ pops->pwm_config = twl6030_pwm_config;
+ pops->pwm_enable = twl6030_pwm_enable;
+ pops->pwm_disable = twl6030_pwm_disable;
+ pwm->name = &pdev->name;
+ pwm->pwm_id = pdev->id;
+ pwm->pops = pops;
+ ret = pwm_device_register(pwm);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register pwm device\n");
+ kfree(pwm);
+ kfree(pops);
+ return ret;
+ }
+ platform_set_drvdata(pdev, pwm);
+ /* Configure PWM */
+ val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC |
+ PWM_CTRL2_MODE_HW;
+
+ ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to configure PWM, Error %d\n", ret);
+ return ret;
+ }
+ dev_dbg(&pdev->dev, "pwm probe successful\n");
+ return ret;
+}
+
+static int __devexit twl6030_pwm_remove(struct platform_device *pdev)
+{
+ struct pwm_device *pwm = platform_get_drvdata(pdev);
+
+ pwm_device_unregister(pwm);
+ kfree(pwm->pops);
+ kfree(pwm);
+ dev_dbg(&pdev->dev, "pwm driver removed\n");
+ return 0;
+}
+
+static struct platform_driver twl6030_pwm_driver = {
+ .driver = {
+ .name = "twl6030_pwm",
+ .owner = THIS_MODULE,
+ },
+ .probe = twl6030_pwm_probe,
+ .remove = __devexit_p(twl6030_pwm_remove),
+};
+
+static int __init twl6030_pwm_init(void)
+{
+ return platform_driver_register(&twl6030_pwm_driver);
+}
+
+static void __exit twl6030_pwm_deinit(void)
+{
+ platform_driver_unregister(&twl6030_pwm_driver);
+}
+
+subsys_initcall(twl6030_pwm_init);
+module_exit(twl6030_pwm_deinit);
--
1.7.2.dirty
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