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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-05 12:01:30 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-05 12:01:30 +0900
commit578f1ef91aa92beb571bfb9af8f4d18f405f3b9e (patch)
tree8ff59e772d09180b7e7f952a8c90a1bcf25e1d19 /drivers/pwm
parentecefbd94b834fa32559d854646d777c56749ef1c (diff)
parent74d8378159de16a0a1d1975d4778120d263d6000 (diff)
downloadop-kernel-dev-578f1ef91aa92beb571bfb9af8f4d18f405f3b9e.zip
op-kernel-dev-578f1ef91aa92beb571bfb9af8f4d18f405f3b9e.tar.gz
Merge tag 'mfd-3.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6
Pull MFD changes from Samuel Ortiz: "MFD bits for the 3.7 merge window. As usual we have a few new drivers: - TI LP8788 - TI OMAP USB TLL - Maxim MAX8907 - SMSC ECE1099 - Dialog Semiconductor DA9055 - A simpler syscon driver that allow us to get rid of the anatop one. Drivers are also gradually getting Device Tree and IRQ domain support. The following drivers got DT support: - palmas, 88pm860x, tc3589x and twl4030-audio And those ones now use the IRQ domain APIs: - 88pm860x, tc3589x, db8500_prcmu Also some other interesting changes: - Intel's ICH LPC now supports Lynx Point - TI's twl4030-audio added a GPO child - tps6527 enabled its backlight subdevice - The twl6030 pwm driver moved to the new PWM subsystem And finally a bunch of cleanup and casual fixes for mc13xxx, 88pm860x, palmas, ab8500, wm8994, wm5110, max8907 and the tps65xxx family." Fix up various annoying conflicts: the DT and IRQ domain support came in twice and was already in 3.6. And then it was apparently rebased. Guys, DON'T REBASE! * tag 'mfd-3.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: (89 commits) ARM: dts: Enable 88pm860x pmic mfd: 88pm860x: Move gpadc init into touch mfd: 88pm860x: Device tree support mfd: 88pm860x: Use irqdomain mfd: smsc: Add support for smsc gpio io/keypad driver backlight: tps65217_bl: Add missing platform_set_drvdata in tps65217_bl_probe mfd: DA9055 core driver mfd: tps65910: Add alarm interrupt of TPS65910 RTC to mfd device list mfd: wm5110: Add register patches for revision B mfd: wm5110: Disable control interface error report for WM5110 rev B mfd: max8907: Remove regulator-compatible from DT docs backlight: Add TPS65217 WLED driver mfd: Add backlight as subdevice to the tps65217 mfd: Provide the PRCMU with its own IRQ domain mfd: Fix max8907 sparse warning mfd: Add lp8788 mfd driver mfd: dbx500: Provide a more accurate smp_twd clock mfd: rc5t583: Fix warning messages regulator: palmas: Add DT support mfd: palmas: Change regulator defns to better suite DT ...
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/Kconfig9
-rw-r--r--drivers/pwm/Makefile1
-rw-r--r--drivers/pwm/pwm-twl6030.c184
3 files changed, 194 insertions, 0 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 90c5c73..d7c6b83 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -115,6 +115,15 @@ config PWM_TIEHRPWM
To compile this driver as a module, choose M here: the module
will be called pwm-tiehrpwm.
+config PWM_TWL6030
+ tristate "TWL6030 PWM support"
+ depends on TWL4030_CORE
+ help
+ Generic PWM framework driver for TWL6030.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-twl6030.
+
config PWM_VT8500
tristate "vt8500 pwm support"
depends on ARCH_VT8500
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index e4b2c89..78f123d 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o
obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o
+obj-$(CONFIG_PWM_TWL6030) += pwm-twl6030.o
obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o
diff --git a/drivers/pwm/pwm-twl6030.c b/drivers/pwm/pwm-twl6030.c
new file mode 100644
index 0000000..8e63878
--- /dev/null
+++ b/drivers/pwm/pwm-twl6030.c
@@ -0,0 +1,184 @@
+/*
+ * twl6030_pwm.c
+ * Driver for PHOENIX (TWL6030) Pulse Width Modulator
+ *
+ * Copyright (C) 2010 Texas Instruments
+ * Author: Hemanth V <hemanthv@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/pwm.h>
+#include <linux/i2c/twl.h>
+#include <linux/slab.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
+
+struct twl6030_pwm_chip {
+ struct pwm_chip chip;
+};
+
+static int twl6030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ int ret;
+ u8 val;
+
+ /* 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(chip->dev, "%s: Failed to configure PWM, Error %d\n",
+ pwm->label, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int twl6030_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ u8 duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns;
+ int ret;
+
+ 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;
+}
+
+static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ int ret;
+ u8 val;
+
+ ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ dev_err(chip->dev, "%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) {
+ dev_err(chip->dev, "%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;
+}
+
+static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ int ret;
+ u8 val;
+
+ ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
+ if (ret < 0) {
+ dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
+ pwm->label, ret);
+ return;
+ }
+
+ 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) {
+ dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
+ pwm->label, ret);
+ }
+}
+
+static const struct pwm_ops twl6030_pwm_ops = {
+ .request = twl6030_pwm_request,
+ .config = twl6030_pwm_config,
+ .enable = twl6030_pwm_enable,
+ .disable = twl6030_pwm_disable,
+};
+
+static int twl6030_pwm_probe(struct platform_device *pdev)
+{
+ struct twl6030_pwm_chip *twl6030;
+ int ret;
+
+ twl6030 = devm_kzalloc(&pdev->dev, sizeof(*twl6030), GFP_KERNEL);
+ if (!twl6030)
+ return -ENOMEM;
+
+ twl6030->chip.dev = &pdev->dev;
+ twl6030->chip.ops = &twl6030_pwm_ops;
+ twl6030->chip.base = -1;
+ twl6030->chip.npwm = 1;
+
+ ret = pwmchip_add(&twl6030->chip);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, twl6030);
+
+ return 0;
+}
+
+static int twl6030_pwm_remove(struct platform_device *pdev)
+{
+ struct twl6030_pwm_chip *twl6030 = platform_get_drvdata(pdev);
+
+ return pwmchip_remove(&twl6030->chip);
+}
+
+static struct platform_driver twl6030_pwm_driver = {
+ .driver = {
+ .name = "twl6030-pwm",
+ },
+ .probe = twl6030_pwm_probe,
+ .remove = __devexit_p(twl6030_pwm_remove),
+};
+module_platform_driver(twl6030_pwm_driver);
+
+MODULE_ALIAS("platform:twl6030-pwm");
+MODULE_LICENSE("GPL");
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