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pwm: Changes for v3.11-rc1

Browse Source 
A new driver supports driving PWM signals using the TPU unit found on
 various Renesas SoCs. Furthermore support is added for the NXP PCA9685
 LED controller. Another big chunk is the sysfs interface which has been
 in the works for quite some time.
 
 The remaining patches are a random assortment of cleanups and fixes.
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Merge tag 'for-3.11-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull pwm changes from Thierry Reding:
 "A new driver supports driving PWM signals using the TPU unit found on
  various Renesas SoCs.  Furthermore support is added for the NXP
  PCA9685 LED controller.  Another big chunk is the sysfs interface
  which has been in the works for quite some time.

  The remaining patches are a random assortment of cleanups and fixes"

* tag 'for-3.11-rc1' of git://gitorious.org/linux-pwm/linux-pwm:
  pwm: pwm-tiehrpwm: Use clk_enable/disable instead clk_prepare/unprepare.
  pwm: pca9685: Fix wrong argument to set MODE1_SLEEP bit
  pwm: renesas-tpu: Add MODULE_ALIAS to make module auto loading work
  pwm: renesas-tpu: fix return value check in tpu_probe()
  pwm: Add Renesas TPU PWM driver
  pwm: Add sysfs interface
  pwm: Fill in missing .owner fields
  pwm: add pca9685 driver
  pwm: atmel-tcb: prepare clk before calling enable
  pwm: devm: alloc correct pointer size
  pwm: mxs: Let device core handle pinctrl
  MAINTAINERS: Update PWM subsystem entry
This commit is contained in:
Linus Torvalds 2013-07-10 11:14:56 -07:00
commit 34ae0a6f05
21 changed files with 1387 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
Documentation/ABI/testing/sysfs-class-pwm Normal file
View File

@ -0,0 +1,79 @@
What: /sys/class/pwm/
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
The pwm/ class sub-directory belongs to the Generic PWM
Framework and provides a sysfs interface for using PWM
channels.
What: /sys/class/pwm/pwmchipN/
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
A /sys/class/pwm/pwmchipN directory is created for each
probed PWM controller/chip where N is the base of the
PWM chip.
What: /sys/class/pwm/pwmchipN/npwm
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
The number of PWM channels supported by the PWM chip.
What: /sys/class/pwm/pwmchipN/export
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Exports a PWM channel from the PWM chip for sysfs control.
Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1.
What: /sys/class/pwm/pwmchipN/unexport
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Unexports a PWM channel.
What: /sys/class/pwm/pwmchipN/pwmX
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
A /sys/class/pwm/pwmchipN/pwmX directory is created for
each exported PWM channel where X is the exported PWM
channel number.
What: /sys/class/pwm/pwmchipN/pwmX/period
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Sets the PWM signal period in nanoseconds.
What: /sys/class/pwm/pwmchipN/pwmX/duty_cycle
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Sets the PWM signal duty cycle in nanoseconds.
What: /sys/class/pwm/pwmchipN/pwmX/polarity
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Sets the output polarity of the PWM signal to "normal" or
"inversed".
What: /sys/class/pwm/pwmchipN/pwmX/enable
Date: May 2013
KernelVersion: 3.11
Contact: H Hartley Sweeten <hsweeten@visionengravers.com>
Description:
Enable/disable the PWM signal.
0 is disabled
1 is enabled

27
Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt Normal file
View File

@ -0,0 +1,27 @@
NXP PCA9685 16-channel 12-bit PWM LED controller
================================================
Required properties:
- compatible: "nxp,pca9685-pwm"
- #pwm-cells: should be 2. The first cell specifies the per-chip index
of the PWM to use and the second cell is the period in nanoseconds.
The index 16 is the ALLCALL channel, that sets all PWM channels at the same
time.
Optional properties:
- invert (bool): boolean to enable inverted logic
- open-drain (bool): boolean to configure outputs with open-drain structure;
if omitted use totem-pole structure
Example:
For LEDs that are directly connected to the PCA, the following setting is
applicable:
pca: pca@41 {
compatible = "nxp,pca9685-pwm";
#pwm-cells = <2>;
reg = <0x41>;
invert;
open-drain;
};

37
Documentation/pwm.txt
View File

@ -45,6 +45,43 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
To start/stop toggling the PWM output use pwm_enable()/pwm_disable().
Using PWMs with the sysfs interface
-----------------------------------
If CONFIG_SYSFS is enabled in your kernel configuration a simple sysfs
interface is provided to use the PWMs from userspace. It is exposed at
/sys/class/pwm/. Each probed PWM controller/chip will be exported as
pwmchipN, where N is the base of the PWM chip. Inside the directory you
will find:
npwm - The number of PWM channels this chip supports (read-only).
export - Exports a PWM channel for use with sysfs (write-only).
unexport - Unexports a PWM channel from sysfs (write-only).
The PWM channels are numbered using a per-chip index from 0 to npwm-1.
When a PWM channel is exported a pwmX directory will be created in the
pwmchipN directory it is associated with, where X is the number of the
channel that was exported. The following properties will then be available:
period - The total period of the PWM signal (read/write).
Value is in nanoseconds and is the sum of the active and inactive
time of the PWM.
duty_cycle - The active time of the PWM signal (read/write).
Value is in nanoseconds and must be less than the period.
polarity - Changes the polarity of the PWM signal (read/write).
Writes to this property only work if the PWM chip supports changing
the polarity. The polarity can only be changed if the PWM is not
enabled. Value is the string "normal" or "inversed".
enable - Enable/disable the PWM signal (read/write).
0 - disabled
1 - enabled
Implementing a PWM driver
-------------------------

4
MAINTAINERS
View File

@ -6568,8 +6568,8 @@ S: Maintained
F: drivers/media/usb/pwc/*
PWM SUBSYSTEM
M: Thierry Reding <thierry.reding@avionic-design.de>
L: linux-kernel@vger.kernel.org
M: Thierry Reding <thierry.reding@gmail.com>
L: linux-pwm@vger.kernel.org
S: Maintained
W: http://gitorious.org/linux-pwm
T: git git://gitorious.org/linux-pwm/linux-pwm.git

23
drivers/pwm/Kconfig
View File

@ -28,6 +28,10 @@ menuconfig PWM
if PWM
config PWM_SYSFS
bool
default y if SYSFS
config PWM_AB8500
tristate "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500
@ -97,6 +101,15 @@ config PWM_MXS
To compile this driver as a module, choose M here: the module
will be called pwm-mxs.
config PWM_PCA9685
tristate "NXP PCA9685 PWM driver"
depends on OF && REGMAP_I2C
help
Generic PWM framework driver for NXP PCA9685 LED controller.
To compile this driver as a module, choose M here: the module
will be called pwm-pca9685.
config PWM_PUV3
tristate "PKUnity NetBook-0916 PWM support"
depends on ARCH_PUV3
@ -115,6 +128,16 @@ config PWM_PXA
To compile this driver as a module, choose M here: the module
will be called pwm-pxa.
config PWM_RENESAS_TPU
tristate "Renesas TPU PWM support"
depends on ARCH_SHMOBILE
help
This driver exposes the Timer Pulse Unit (TPU) PWM controller found
in Renesas chips through the PWM API.
To compile this driver as a module, choose M here: the module
will be called pwm-renesas-tpu.
config PWM_SAMSUNG
tristate "Samsung PWM support"
depends on PLAT_SAMSUNG

3
drivers/pwm/Makefile
View File

@ -1,4 +1,5 @@
obj-$(CONFIG_PWM) += core.o
obj-$(CONFIG_PWM_SYSFS) += sysfs.o
obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
@ -6,8 +7,10 @@ obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
obj-$(CONFIG_PWM_RENESAS_TPU) += pwm-renesas-tpu.o
obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_SPEAR) += pwm-spear.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o

29
drivers/pwm/core.c
View File

@ -274,6 +274,8 @@ int pwmchip_add(struct pwm_chip *chip)
if (IS_ENABLED(CONFIG_OF))
of_pwmchip_add(chip);
pwmchip_sysfs_export(chip);
out:
mutex_unlock(&pwm_lock);
return ret;
@ -310,6 +312,8 @@ int pwmchip_remove(struct pwm_chip *chip)
free_pwms(chip);
pwmchip_sysfs_unexport(chip);
out:
mutex_unlock(&pwm_lock);
return ret;
@ -402,10 +406,19 @@ EXPORT_SYMBOL_GPL(pwm_free);
*/
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
int err;
if (!pwm || duty_ns < 0 || period_ns <= 0 || duty_ns > period_ns)
return -EINVAL;
return pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
err = pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
if (err)
return err;
pwm->duty_cycle = duty_ns;
pwm->period = period_ns;
return 0;
}
EXPORT_SYMBOL_GPL(pwm_config);
@ -418,6 +431,8 @@ EXPORT_SYMBOL_GPL(pwm_config);
*/
int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
{
int err;
if (!pwm || !pwm->chip->ops)
return -EINVAL;
@ -427,7 +442,13 @@ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
if (test_bit(PWMF_ENABLED, &pwm->flags))
return -EBUSY;
return pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
err = pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
if (err)
return err;
pwm->polarity = polarity;
return 0;
}
EXPORT_SYMBOL_GPL(pwm_set_polarity);
@ -694,7 +715,7 @@ struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
{
struct pwm_device **ptr, *pwm;
ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL);
ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
@ -724,7 +745,7 @@ struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
{
struct pwm_device **ptr, *pwm;
ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL);
ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);

5
drivers/pwm/pwm-atmel-tcb.c
View File

@ -76,7 +76,7 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
if (!tcbpwm)
return -ENOMEM;
ret = clk_enable(tc->clk[group]);
ret = clk_prepare_enable(tc->clk[group]);
if (ret) {
devm_kfree(chip->dev, tcbpwm);
return ret;
@ -124,7 +124,7 @@ static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);
struct atmel_tc *tc = tcbpwmc->tc;
clk_disable(tc->clk[pwm->hwpwm / 2]);
clk_disable_unprepare(tc->clk[pwm->hwpwm / 2]);
tcbpwmc->pwms[pwm->hwpwm] = NULL;
devm_kfree(chip->dev, tcbpwm);
}
@ -434,6 +434,7 @@ MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
static struct platform_driver atmel_tcb_pwm_driver = {
.driver = {
.name = "atmel-tcb-pwm",
.owner = THIS_MODULE,
.of_match_table = atmel_tcb_pwm_dt_ids,
},
.probe = atmel_tcb_pwm_probe,

1
drivers/pwm/pwm-bfin.c
View File

@ -149,6 +149,7 @@ static int bfin_pwm_remove(struct platform_device *pdev)
static struct platform_driver bfin_pwm_driver = {
.driver = {
.name = "bfin-pwm",
.owner = THIS_MODULE,
},
.probe = bfin_pwm_probe,
.remove = bfin_pwm_remove,

1
drivers/pwm/pwm-imx.c
View File

@ -295,6 +295,7 @@ static int imx_pwm_remove(struct platform_device *pdev)
static struct platform_driver imx_pwm_driver = {
.driver = {
.name = "imx-pwm",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(imx_pwm_dt_ids),
},
.probe = imx_pwm_probe,

1
drivers/pwm/pwm-lpc32xx.c
View File

@ -171,6 +171,7 @@ MODULE_DEVICE_TABLE(of, lpc32xx_pwm_dt_ids);
static struct platform_driver lpc32xx_pwm_driver = {
.driver = {
.name = "lpc32xx-pwm",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(lpc32xx_pwm_dt_ids),
},
.probe = lpc32xx_pwm_probe,

7
drivers/pwm/pwm-mxs.c
View File

@ -16,7 +16,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
@ -130,7 +129,6 @@ static int mxs_pwm_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct mxs_pwm_chip *mxs;
struct resource *res;
struct pinctrl *pinctrl;
int ret;
mxs = devm_kzalloc(&pdev->dev, sizeof(*mxs), GFP_KERNEL);
@ -142,10 +140,6 @@ static int mxs_pwm_probe(struct platform_device *pdev)
if (IS_ERR(mxs->base))
return PTR_ERR(mxs->base);
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl))
return PTR_ERR(pinctrl);
mxs->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(mxs->clk))
return PTR_ERR(mxs->clk);
@ -188,6 +182,7 @@ MODULE_DEVICE_TABLE(of, mxs_pwm_dt_ids);
static struct platform_driver mxs_pwm_driver = {
.driver = {
.name = "mxs-pwm",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(mxs_pwm_dt_ids),
},
.probe = mxs_pwm_probe,

300
drivers/pwm/pwm-pca9685.c Normal file
View File

@ -0,0 +1,300 @@
/*
* Driver for PCA9685 16-channel 12-bit PWM LED controller
*
* Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
*
* based on the pwm-twl-led.c driver
*
* 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/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define PCA9685_MODE1 0x00
#define PCA9685_MODE2 0x01
#define PCA9685_SUBADDR1 0x02
#define PCA9685_SUBADDR2 0x03
#define PCA9685_SUBADDR3 0x04
#define PCA9685_ALLCALLADDR 0x05
#define PCA9685_LEDX_ON_L 0x06
#define PCA9685_LEDX_ON_H 0x07
#define PCA9685_LEDX_OFF_L 0x08
#define PCA9685_LEDX_OFF_H 0x09
#define PCA9685_ALL_LED_ON_L 0xFA
#define PCA9685_ALL_LED_ON_H 0xFB
#define PCA9685_ALL_LED_OFF_L 0xFC
#define PCA9685_ALL_LED_OFF_H 0xFD
#define PCA9685_PRESCALE 0xFE
#define PCA9685_NUMREGS 0xFF
#define PCA9685_MAXCHAN 0x10
#define LED_FULL (1 << 4)
#define MODE1_SLEEP (1 << 4)
#define MODE2_INVRT (1 << 4)
#define MODE2_OUTDRV (1 << 2)
#define LED_N_ON_H(N) (PCA9685_LEDX_ON_H + (4 * (N)))
#define LED_N_ON_L(N) (PCA9685_LEDX_ON_L + (4 * (N)))
#define LED_N_OFF_H(N) (PCA9685_LEDX_OFF_H + (4 * (N)))
#define LED_N_OFF_L(N) (PCA9685_LEDX_OFF_L + (4 * (N)))
struct pca9685 {
struct pwm_chip chip;
struct regmap *regmap;
int active_cnt;
};
static inline struct pca9685 *to_pca(struct pwm_chip *chip)
{
return container_of(chip, struct pca9685, chip);
}
static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
struct pca9685 *pca = to_pca(chip);
unsigned long long duty;
unsigned int reg;
if (duty_ns < 1) {
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_H;
else
reg = LED_N_OFF_H(pwm->hwpwm);
regmap_write(pca->regmap, reg, LED_FULL);
return 0;
}
if (duty_ns == period_ns) {
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_ON_H;
else
reg = LED_N_ON_H(pwm->hwpwm);
regmap_write(pca->regmap, reg, LED_FULL);
return 0;
}
duty = 4096 * (unsigned long long)duty_ns;
duty = DIV_ROUND_UP_ULL(duty, period_ns);
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_L;
else
reg = LED_N_OFF_L(pwm->hwpwm);
regmap_write(pca->regmap, reg, (int)duty & 0xff);
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_H;
else
reg = LED_N_OFF_H(pwm->hwpwm);
regmap_write(pca->regmap, reg, ((int)duty >> 8) & 0xf);
return 0;
}
static int pca9685_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct pca9685 *pca = to_pca(chip);
unsigned int reg;
/*
* The PWM subsystem does not support a pre-delay.
* So, set the ON-timeout to 0
*/
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_ON_L;
else
reg = LED_N_ON_L(pwm->hwpwm);
regmap_write(pca->regmap, reg, 0);
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_ON_H;
else
reg = LED_N_ON_H(pwm->hwpwm);
regmap_write(pca->regmap, reg, 0);
/*
* Clear the full-off bit.
* It has precedence over the others and must be off.
*/
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_H;
else
reg = LED_N_OFF_H(pwm->hwpwm);
regmap_update_bits(pca->regmap, reg, LED_FULL, 0x0);
return 0;
}
static void pca9685_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct pca9685 *pca = to_pca(chip);
unsigned int reg;
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_H;
else
reg = LED_N_OFF_H(pwm->hwpwm);
regmap_write(pca->regmap, reg, LED_FULL);
/* Clear the LED_OFF counter. */
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_OFF_L;
else
reg = LED_N_OFF_L(pwm->hwpwm);
regmap_write(pca->regmap, reg, 0x0);
}
static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct pca9685 *pca = to_pca(chip);
if (pca->active_cnt++ == 0)
return regmap_update_bits(pca->regmap, PCA9685_MODE1,
MODE1_SLEEP, 0x0);
return 0;
}
static void pca9685_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct pca9685 *pca = to_pca(chip);
if (--pca->active_cnt == 0)
regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
MODE1_SLEEP);
}
static const struct pwm_ops pca9685_pwm_ops = {
.enable = pca9685_pwm_enable,
.disable = pca9685_pwm_disable,
.config = pca9685_pwm_config,
.request = pca9685_pwm_request,
.free = pca9685_pwm_free,
.owner = THIS_MODULE,
};
static struct regmap_config pca9685_regmap_i2c_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = PCA9685_NUMREGS,
.cache_type = REGCACHE_NONE,
};
static int pca9685_pwm_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device_node *np = client->dev.of_node;
struct pca9685 *pca;
int ret;
int mode2;
pca = devm_kzalloc(&client->dev, sizeof(*pca), GFP_KERNEL);
if (!pca)
return -ENOMEM;
pca->regmap = devm_regmap_init_i2c(client, &pca9685_regmap_i2c_config);
if (IS_ERR(pca->regmap)) {
ret = PTR_ERR(pca->regmap);
dev_err(&client->dev, "Failed to initialize register map: %d\n",
ret);
return ret;
}
i2c_set_clientdata(client, pca);
regmap_read(pca->regmap, PCA9685_MODE2, &mode2);
if (of_property_read_bool(np, "invert"))
mode2 |= MODE2_INVRT;
else
mode2 &= ~MODE2_INVRT;
if (of_property_read_bool(np, "open-drain"))
mode2 &= ~MODE2_OUTDRV;
else
mode2 |= MODE2_OUTDRV;
regmap_write(pca->regmap, PCA9685_MODE2, mode2);
/* clear all "full off" bits */
regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_L, 0);
regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_H, 0);
pca->chip.ops = &pca9685_pwm_ops;
/* add an extra channel for ALL_LED */
pca->chip.npwm = PCA9685_MAXCHAN + 1;
pca->chip.dev = &client->dev;
pca->chip.base = -1;
pca->chip.can_sleep = true;
return pwmchip_add(&pca->chip);
}
static int pca9685_pwm_remove(struct i2c_client *client)
{
struct pca9685 *pca = i2c_get_clientdata(client);
regmap_update_bits(pca->regmap, PCA9685_MODE1, MODE1_SLEEP,
MODE1_SLEEP);
return pwmchip_remove(&pca->chip);
}
static const struct i2c_device_id pca9685_id[] = {
{ "pca9685", 0 },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(i2c, pca9685_id);
static const struct of_device_id pca9685_dt_ids[] = {
{ .compatible = "nxp,pca9685-pwm", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
static struct i2c_driver pca9685_i2c_driver = {
.driver = {
.name = "pca9685-pwm",
.owner = THIS_MODULE,
.of_match_table = pca9685_dt_ids,
},
.probe = pca9685_pwm_probe,
.remove = pca9685_pwm_remove,
.id_table = pca9685_id,
};
module_i2c_driver(pca9685_i2c_driver);
MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
MODULE_DESCRIPTION("PWM driver for PCA9685");
MODULE_LICENSE("GPL");

1
drivers/pwm/pwm-puv3.c
View File

@ -146,6 +146,7 @@ static int pwm_remove(struct platform_device *pdev)
static struct platform_driver puv3_pwm_driver = {
.driver = {
.name = "PKUnity-v3-PWM",
.owner = THIS_MODULE,
},
.probe = pwm_probe,
.remove = pwm_remove,

474
drivers/pwm/pwm-renesas-tpu.c Normal file
View File

@ -0,0 +1,474 @@
/*
* R-Mobile TPU PWM driver
*
* Copyright (C) 2012 Renesas Solutions Corp.
*
* 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; either version 2 of the License
*
* 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.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_data/pwm-renesas-tpu.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/pwm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#define TPU_TSTR 0x00 /* Timer start register (shared) */
#define TPU_TCRn 0x00 /* Timer control register */
#define TPU_TCR_CCLR_NONE (0 << 5)
#define TPU_TCR_CCLR_TGRA (1 << 5)
#define TPU_TCR_CCLR_TGRB (2 << 5)
#define TPU_TCR_CCLR_TGRC (5 << 5)
#define TPU_TCR_CCLR_TGRD (6 << 5)
#define TPU_TCR_CKEG_RISING (0 << 3)
#define TPU_TCR_CKEG_FALLING (1 << 3)
#define TPU_TCR_CKEG_BOTH (2 << 3)
#define TPU_TMDRn 0x04 /* Timer mode register */
#define TPU_TMDR_BFWT (1 << 6)
#define TPU_TMDR_BFB (1 << 5)
#define TPU_TMDR_BFA (1 << 4)
#define TPU_TMDR_MD_NORMAL (0 << 0)
#define TPU_TMDR_MD_PWM (2 << 0)
#define TPU_TIORn 0x08 /* Timer I/O control register */
#define TPU_TIOR_IOA_0 (0 << 0)
#define TPU_TIOR_IOA_0_CLR (1 << 0)
#define TPU_TIOR_IOA_0_SET (2 << 0)
#define TPU_TIOR_IOA_0_TOGGLE (3 << 0)
#define TPU_TIOR_IOA_1 (4 << 0)
#define TPU_TIOR_IOA_1_CLR (5 << 0)
#define TPU_TIOR_IOA_1_SET (6 << 0)
#define TPU_TIOR_IOA_1_TOGGLE (7 << 0)
#define TPU_TIERn 0x0c /* Timer interrupt enable register */
#define TPU_TSRn 0x10 /* Timer status register */
#define TPU_TCNTn 0x14 /* Timer counter */
#define TPU_TGRAn 0x18 /* Timer general register A */
#define TPU_TGRBn 0x1c /* Timer general register B */
#define TPU_TGRCn 0x20 /* Timer general register C */
#define TPU_TGRDn 0x24 /* Timer general register D */
#define TPU_CHANNEL_OFFSET 0x10
#define TPU_CHANNEL_SIZE 0x40
enum tpu_pin_state {
TPU_PIN_INACTIVE, /* Pin is driven inactive */
TPU_PIN_PWM, /* Pin is driven by PWM */
TPU_PIN_ACTIVE, /* Pin is driven active */
};
struct tpu_device;
struct tpu_pwm_device {
bool timer_on; /* Whether the timer is running */
struct tpu_device *tpu;
unsigned int channel; /* Channel number in the TPU */
enum pwm_polarity polarity;
unsigned int prescaler;
u16 period;
u16 duty;
};
struct tpu_device {
struct platform_device *pdev;
struct tpu_pwm_platform_data *pdata;
struct pwm_chip chip;
spinlock_t lock;
void __iomem *base;
struct clk *clk;
};
#define to_tpu_device(c) container_of(c, struct tpu_device, chip)
static void tpu_pwm_write(struct tpu_pwm_device *pwm, int reg_nr, u16 value)
{
void __iomem *base = pwm->tpu->base + TPU_CHANNEL_OFFSET
+ pwm->channel * TPU_CHANNEL_SIZE;
iowrite16(value, base + reg_nr);
}
static void tpu_pwm_set_pin(struct tpu_pwm_device *pwm,
enum tpu_pin_state state)
{
static const char * const states[] = { "inactive", "PWM", "active" };
dev_dbg(&pwm->tpu->pdev->dev, "%u: configuring pin as %s\n",
pwm->channel, states[state]);
switch (state) {
case TPU_PIN_INACTIVE:
tpu_pwm_write(pwm, TPU_TIORn,
pwm->polarity == PWM_POLARITY_INVERSED ?
TPU_TIOR_IOA_1 : TPU_TIOR_IOA_0);
break;
case TPU_PIN_PWM:
tpu_pwm_write(pwm, TPU_TIORn,
pwm->polarity == PWM_POLARITY_INVERSED ?
TPU_TIOR_IOA_0_SET : TPU_TIOR_IOA_1_CLR);
break;
case TPU_PIN_ACTIVE:
tpu_pwm_write(pwm, TPU_TIORn,
pwm->polarity == PWM_POLARITY_INVERSED ?
TPU_TIOR_IOA_0 : TPU_TIOR_IOA_1);
break;
}
}
static void tpu_pwm_start_stop(struct tpu_pwm_device *pwm, int start)
{
unsigned long flags;
u16 value;
spin_lock_irqsave(&pwm->tpu->lock, flags);
value = ioread16(pwm->tpu->base + TPU_TSTR);
if (start)
value |= 1 << pwm->channel;
else
value &= ~(1 << pwm->channel);
iowrite16(value, pwm->tpu->base + TPU_TSTR);
spin_unlock_irqrestore(&pwm->tpu->lock, flags);
}
static int tpu_pwm_timer_start(struct tpu_pwm_device *pwm)
{
int ret;
if (!pwm->timer_on) {
/* Wake up device and enable clock. */
pm_runtime_get_sync(&pwm->tpu->pdev->dev);
ret = clk_prepare_enable(pwm->tpu->clk);
if (ret) {
dev_err(&pwm->tpu->pdev->dev, "cannot enable clock\n");
return ret;
}
pwm->timer_on = true;
}
/*
* Make sure the channel is stopped, as we need to reconfigure it
* completely. First drive the pin to the inactive state to avoid
* glitches.
*/
tpu_pwm_set_pin(pwm, TPU_PIN_INACTIVE);
tpu_pwm_start_stop(pwm, false);
/*
* - Clear TCNT on TGRB match
* - Count on rising edge
* - Set prescaler
* - Output 0 until TGRA, output 1 until TGRB (active low polarity)
* - Output 1 until TGRA, output 0 until TGRB (active high polarity
* - PWM mode
*/
tpu_pwm_write(pwm, TPU_TCRn, TPU_TCR_CCLR_TGRB | TPU_TCR_CKEG_RISING |
pwm->prescaler);
tpu_pwm_write(pwm, TPU_TMDRn, TPU_TMDR_MD_PWM);
tpu_pwm_set_pin(pwm, TPU_PIN_PWM);
tpu_pwm_write(pwm, TPU_TGRAn, pwm->duty);
tpu_pwm_write(pwm, TPU_TGRBn, pwm->period);
dev_dbg(&pwm->tpu->pdev->dev, "%u: TGRA 0x%04x TGRB 0x%04x\n",
pwm->channel, pwm->duty, pwm->period);
/* Start the channel. */
tpu_pwm_start_stop(pwm, true);
return 0;
}
static void tpu_pwm_timer_stop(struct tpu_pwm_device *pwm)
{
if (!pwm->timer_on)
return;
/* Disable channel. */
tpu_pwm_start_stop(pwm, false);
/* Stop clock and mark device as idle. */
clk_disable_unprepare(pwm->tpu->clk);
pm_runtime_put(&pwm->tpu->pdev->dev);
pwm->timer_on = false;
}
/* -----------------------------------------------------------------------------
* PWM API
*/
static int tpu_pwm_request(struct pwm_chip *chip, struct pwm_device *_pwm)
{
struct tpu_device *tpu = to_tpu_device(chip);
struct tpu_pwm_device *pwm;
if (_pwm->hwpwm >= TPU_CHANNEL_MAX)
return -EINVAL;
pwm = kzalloc(sizeof(*pwm), GFP_KERNEL);
if (pwm == NULL)
return -ENOMEM;
pwm->tpu = tpu;
pwm->channel = _pwm->hwpwm;
pwm->polarity = tpu->pdata ? tpu->pdata->channels[pwm->channel].polarity
: PWM_POLARITY_NORMAL;
pwm->prescaler = 0;
pwm->period = 0;
pwm->duty = 0;
pwm->timer_on = false;
pwm_set_chip_data(_pwm, pwm);
return 0;
}
static void tpu_pwm_free(struct pwm_chip *chip, struct pwm_device *_pwm)
{
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
tpu_pwm_timer_stop(pwm);
kfree(pwm);
}
static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
int duty_ns, int period_ns)
{
static const unsigned int prescalers[] = { 1, 4, 16, 64 };
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
struct tpu_device *tpu = to_tpu_device(chip);
unsigned int prescaler;
bool duty_only = false;
u32 clk_rate;
u32 period;
u32 duty;
int ret;
/*
* Pick a prescaler to avoid overflowing the counter.
* TODO: Pick the highest acceptable prescaler.
*/
clk_rate = clk_get_rate(tpu->clk);
for (prescaler = 0; prescaler < ARRAY_SIZE(prescalers); ++prescaler) {
period = clk_rate / prescalers[prescaler]
/ (NSEC_PER_SEC / period_ns);
if (period <= 0xffff)
break;
}
if (prescaler == ARRAY_SIZE(prescalers) || period == 0) {
dev_err(&tpu->pdev->dev, "clock rate mismatch\n");
return -ENOTSUPP;
}
if (duty_ns) {
duty = clk_rate / prescalers[prescaler]
/ (NSEC_PER_SEC / duty_ns);
if (duty > period)
return -EINVAL;
} else {
duty = 0;
}
dev_dbg(&tpu->pdev->dev,
"rate %u, prescaler %u, period %u, duty %u\n",
clk_rate, prescalers[prescaler], period, duty);
if (pwm->prescaler == prescaler && pwm->period == period)
duty_only = true;
pwm->prescaler = prescaler;
pwm->period = period;
pwm->duty = duty;
/* If the channel is disabled we're done. */
if (!test_bit(PWMF_ENABLED, &_pwm->flags))
return 0;
if (duty_only && pwm->timer_on) {
/*
* If only the duty cycle changed and the timer is already
* running, there's no need to reconfigure it completely, Just
* modify the duty cycle.
*/
tpu_pwm_write(pwm, TPU_TGRAn, pwm->duty);
dev_dbg(&tpu->pdev->dev, "%u: TGRA 0x%04x\n", pwm->channel,
pwm->duty);
} else {
/* Otherwise perform a full reconfiguration. */
ret = tpu_pwm_timer_start(pwm);
if (ret < 0)
return ret;
}
if (duty == 0 || duty == period) {
/*
* To avoid running the timer when not strictly required, handle
* 0% and 100% duty cycles as fixed levels and stop the timer.
*/
tpu_pwm_set_pin(pwm, duty ? TPU_PIN_ACTIVE : TPU_PIN_INACTIVE);
tpu_pwm_timer_stop(pwm);
}
return 0;
}
static int tpu_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *_pwm,
enum pwm_polarity polarity)
{
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
pwm->polarity = polarity;
return 0;
}
static int tpu_pwm_enable(struct pwm_chip *chip, struct pwm_device *_pwm)
{
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
int ret;
ret = tpu_pwm_timer_start(pwm);
if (ret < 0)
return ret;
/*
* To avoid running the timer when not strictly required, handle 0% and
* 100% duty cycles as fixed levels and stop the timer.
*/
if (pwm->duty == 0 || pwm->duty == pwm->period) {
tpu_pwm_set_pin(pwm, pwm->duty ?
TPU_PIN_ACTIVE : TPU_PIN_INACTIVE);
tpu_pwm_timer_stop(pwm);
}
return 0;
}
static void tpu_pwm_disable(struct pwm_chip *chip, struct pwm_device *_pwm)
{
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
/* The timer must be running to modify the pin output configuration. */
tpu_pwm_timer_start(pwm);
tpu_pwm_set_pin(pwm, TPU_PIN_INACTIVE);
tpu_pwm_timer_stop(pwm);
}
static const struct pwm_ops tpu_pwm_ops = {
.request = tpu_pwm_request,
.free = tpu_pwm_free,
.config = tpu_pwm_config,
.set_polarity = tpu_pwm_set_polarity,
.enable = tpu_pwm_enable,
.disable = tpu_pwm_disable,
.owner = THIS_MODULE,
};
/* -----------------------------------------------------------------------------
* Probe and remove
*/
static int tpu_probe(struct platform_device *pdev)
{
struct tpu_device *tpu;
struct resource *res;
int ret;
tpu = devm_kzalloc(&pdev->dev, sizeof(*tpu), GFP_KERNEL);
if (tpu == NULL) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
return -ENOMEM;
}
tpu->pdata = pdev->dev.platform_data;
/* Map memory, get clock and pin control. */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get I/O memory\n");
return -ENXIO;
}
tpu->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(tpu->base))
return PTR_ERR(tpu->base);
tpu->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(tpu->clk)) {
dev_err(&pdev->dev, "cannot get clock\n");
return PTR_ERR(tpu->clk);
}
/* Initialize and register the device. */
platform_set_drvdata(pdev, tpu);
spin_lock_init(&tpu->lock);
tpu->pdev = pdev;
tpu->chip.dev = &pdev->dev;
tpu->chip.ops = &tpu_pwm_ops;
tpu->chip.base = -1;
tpu->chip.npwm = TPU_CHANNEL_MAX;
ret = pwmchip_add(&tpu->chip);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register PWM chip\n");
return ret;
}
dev_info(&pdev->dev, "TPU PWM %d registered\n", tpu->pdev->id);
pm_runtime_enable(&pdev->dev);
return 0;
}
static int tpu_remove(struct platform_device *pdev)
{
struct tpu_device *tpu = platform_get_drvdata(pdev);
int ret;
ret = pwmchip_remove(&tpu->chip);
if (ret)
return ret;
pm_runtime_disable(&pdev->dev);
return 0;
}
static struct platform_driver tpu_driver = {
.probe = tpu_probe,
.remove = tpu_remove,
.driver = {
.name = "renesas-tpu-pwm",
.owner = THIS_MODULE,
}
};
module_platform_driver(tpu_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Renesas TPU PWM Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:renesas-tpu-pwm");

1
drivers/pwm/pwm-spear.c
View File

@ -259,6 +259,7 @@ MODULE_DEVICE_TABLE(of, spear_pwm_of_match);
static struct platform_driver spear_pwm_driver = {
.driver = {
.name = "spear-pwm",
.owner = THIS_MODULE,
.of_match_table = spear_pwm_of_match,
},
.probe = spear_pwm_probe,

1
drivers/pwm/pwm-tegra.c
View File

@ -239,6 +239,7 @@ MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
static struct platform_driver tegra_pwm_driver = {
.driver = {
.name = "tegra-pwm",
.owner = THIS_MODULE,
.of_match_table = tegra_pwm_of_match,
},
.probe = tegra_pwm_probe,

13
drivers/pwm/pwm-tiehrpwm.c
View File

@ -359,7 +359,7 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
configure_polarity(pc, pwm->hwpwm);
/* Enable TBCLK before enabling PWM device */
ret = clk_prepare_enable(pc->tbclk);
ret = clk_enable(pc->tbclk);
if (ret) {
pr_err("Failed to enable TBCLK for %s\n",
dev_name(pc->chip.dev));
@ -395,7 +395,7 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
/* Disabling TBCLK on PWM disable */
clk_disable_unprepare(pc->tbclk);
clk_disable(pc->tbclk);
/* Stop Time base counter */
ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_STOP_NEXT);
@ -482,6 +482,12 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
return PTR_ERR(pc->tbclk);
}
ret = clk_prepare(pc->tbclk);
if (ret < 0) {
dev_err(&pdev->dev, "clk_prepare() failed: %d\n", ret);
return ret;
}
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
@ -508,6 +514,7 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pwmchip_remove(&pc->chip);
clk_unprepare(pc->tbclk);
return ret;
}
@ -515,6 +522,8 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
{
struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
clk_unprepare(pc->tbclk);
pm_runtime_get_sync(&pdev->dev);
/*
* Due to hardware misbehaviour, acknowledge of the stop_req

352
drivers/pwm/sysfs.c Normal file
View File

@ -0,0 +1,352 @@
/*
* A simple sysfs interface for the generic PWM framework
*
* Copyright (C) 2013 H Hartley Sweeten <hsweeten@visionengravers.com>
*
* Based on previous work by Lars Poeschel <poeschel@lemonage.de>
*
* 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; either version 2, or (at your option)
* any later version.
*
* 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.
*/
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/pwm.h>
struct pwm_export {
struct device child;
struct pwm_device *pwm;
};
static struct pwm_export *child_to_pwm_export(struct device *child)
{
return container_of(child, struct pwm_export, child);
}
static struct pwm_device *child_to_pwm_device(struct device *child)
{
struct pwm_export *export = child_to_pwm_export(child);
return export->pwm;
}
static ssize_t pwm_period_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
return sprintf(buf, "%u\n", pwm->period);
}
static ssize_t pwm_period_store(struct device *child,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
unsigned int val;
int ret;
ret = kstrtouint(buf, 0, &val);
if (ret)
return ret;
ret = pwm_config(pwm, pwm->duty_cycle, val);
return ret ? : size;
}
static ssize_t pwm_duty_cycle_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
return sprintf(buf, "%u\n", pwm->duty_cycle);
}
static ssize_t pwm_duty_cycle_store(struct device *child,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
unsigned int val;
int ret;
ret = kstrtouint(buf, 0, &val);
if (ret)
return ret;
ret = pwm_config(pwm, val, pwm->period);
return ret ? : size;
}
static ssize_t pwm_enable_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
int enabled = test_bit(PWMF_ENABLED, &pwm->flags);
return sprintf(buf, "%d\n", enabled);
}
static ssize_t pwm_enable_store(struct device *child,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
int val, ret;
ret = kstrtoint(buf, 0, &val);
if (ret)
return ret;
switch (val) {
case 0:
pwm_disable(pwm);
break;
case 1:
ret = pwm_enable(pwm);
break;
default:
ret = -EINVAL;
break;
}
return ret ? : size;
}
static ssize_t pwm_polarity_show(struct device *child,
struct device_attribute *attr,
char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
return sprintf(buf, "%s\n", pwm->polarity ? "inversed" : "normal");
}
static ssize_t pwm_polarity_store(struct device *child,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
enum pwm_polarity polarity;
int ret;
if (sysfs_streq(buf, "normal"))
polarity = PWM_POLARITY_NORMAL;
else if (sysfs_streq(buf, "inversed"))
polarity = PWM_POLARITY_INVERSED;
else
return -EINVAL;
ret = pwm_set_polarity(pwm, polarity);
return ret ? : size;
}
static DEVICE_ATTR(period, 0644, pwm_period_show, pwm_period_store);
static DEVICE_ATTR(duty_cycle, 0644, pwm_duty_cycle_show, pwm_duty_cycle_store);
static DEVICE_ATTR(enable, 0644, pwm_enable_show, pwm_enable_store);
static DEVICE_ATTR(polarity, 0644, pwm_polarity_show, pwm_polarity_store);
static struct attribute *pwm_attrs[] = {
&dev_attr_period.attr,
&dev_attr_duty_cycle.attr,
&dev_attr_enable.attr,
&dev_attr_polarity.attr,
NULL
};
static const struct attribute_group pwm_attr_group = {
.attrs = pwm_attrs,
};
static const struct attribute_group *pwm_attr_groups[] = {
&pwm_attr_group,
NULL,
};
static void pwm_export_release(struct device *child)
{
struct pwm_export *export = child_to_pwm_export(child);
kfree(export);
}
static int pwm_export_child(struct device *parent, struct pwm_device *pwm)
{
struct pwm_export *export;
int ret;
if (test_and_set_bit(PWMF_EXPORTED, &pwm->flags))
return -EBUSY;
export = kzalloc(sizeof(*export), GFP_KERNEL);
if (!export) {
clear_bit(PWMF_EXPORTED, &pwm->flags);
return -ENOMEM;
}
export->pwm = pwm;
export->child.release = pwm_export_release;
export->child.parent = parent;
export->child.devt = MKDEV(0, 0);
export->child.groups = pwm_attr_groups;
dev_set_name(&export->child, "pwm%u", pwm->hwpwm);
ret = device_register(&export->child);
if (ret) {
clear_bit(PWMF_EXPORTED, &pwm->flags);
kfree(export);
return ret;
}
return 0;
}
static int pwm_unexport_match(struct device *child, void *data)
{
return child_to_pwm_device(child) == data;
}
static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
{
struct device *child;
if (!test_and_clear_bit(PWMF_EXPORTED, &pwm->flags))
return -ENODEV;
child = device_find_child(parent, pwm, pwm_unexport_match);
if (!child)
return -ENODEV;
/* for device_find_child() */
put_device(child);
device_unregister(child);
pwm_put(pwm);
return 0;
}
static ssize_t pwm_export_store(struct device *parent,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct pwm_chip *chip = dev_get_drvdata(parent);
struct pwm_device *pwm;
unsigned int hwpwm;
int ret;
ret = kstrtouint(buf, 0, &hwpwm);
if (ret < 0)
return ret;
if (hwpwm >= chip->npwm)
return -ENODEV;
pwm = pwm_request_from_chip(chip, hwpwm, "sysfs");
if (IS_ERR(pwm))
return PTR_ERR(pwm);
ret = pwm_export_child(parent, pwm);
if (ret < 0)
pwm_put(pwm);
return ret ? : len;
}
static ssize_t pwm_unexport_store(struct device *parent,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct pwm_chip *chip = dev_get_drvdata(parent);
unsigned int hwpwm;
int ret;
ret = kstrtouint(buf, 0, &hwpwm);
if (ret < 0)
return ret;
if (hwpwm >= chip->npwm)
return -ENODEV;
ret = pwm_unexport_child(parent, &chip->pwms[hwpwm]);
return ret ? : len;
}
static ssize_t pwm_npwm_show(struct device *parent,
struct device_attribute *attr,
char *buf)
{
const struct pwm_chip *chip = dev_get_drvdata(parent);
return sprintf(buf, "%u\n", chip->npwm);
}
static struct device_attribute pwm_chip_attrs[] = {
__ATTR(export, 0200, NULL, pwm_export_store),
__ATTR(unexport, 0200, NULL, pwm_unexport_store),
__ATTR(npwm, 0444, pwm_npwm_show, NULL),
__ATTR_NULL,
};
static struct class pwm_class = {
.name = "pwm",
.owner = THIS_MODULE,
.dev_attrs = pwm_chip_attrs,
};
static int pwmchip_sysfs_match(struct device *parent, const void *data)
{
return dev_get_drvdata(parent) == data;
}
void pwmchip_sysfs_export(struct pwm_chip *chip)
{
struct device *parent;
/*
* If device_create() fails the pwm_chip is still usable by
* the kernel its just not exported.
*/
parent = device_create(&pwm_class, chip->dev, MKDEV(0, 0), chip,
"pwmchip%d", chip->base);
if (IS_ERR(parent)) {
dev_warn(chip->dev,
"device_create failed for pwm_chip sysfs export\n");
}
}
void pwmchip_sysfs_unexport(struct pwm_chip *chip)
{
struct device *parent;
parent = class_find_device(&pwm_class, NULL, chip,
pwmchip_sysfs_match);
if (parent) {
/* for class_find_device() */
put_device(parent);
device_unregister(parent);
}
}
static int __init pwm_sysfs_init(void)
{
return class_register(&pwm_class);
}
subsys_initcall(pwm_sysfs_init);

16
include/linux/platform_data/pwm-renesas-tpu.h Normal file
View File

@ -0,0 +1,16 @@
#ifndef __PWM_RENESAS_TPU_H__
#define __PWM_RENESAS_TPU_H__
#include <linux/pwm.h>
#define TPU_CHANNEL_MAX 4
struct tpu_pwm_channel_data {
enum pwm_polarity polarity;
};
struct tpu_pwm_platform_data {
struct tpu_pwm_channel_data channels[TPU_CHANNEL_MAX];
};
#endif /* __PWM_RENESAS_TPU_H__ */

29
include/linux/pwm.h
View File

@ -76,6 +76,7 @@ enum pwm_polarity {
enum {
PWMF_REQUESTED = 1 << 0,
PWMF_ENABLED = 1 << 1,
PWMF_EXPORTED = 1 << 2,
};
struct pwm_device {
@ -86,7 +87,9 @@ struct pwm_device {
struct pwm_chip *chip;
void *chip_data;
unsigned int period; /* in nanoseconds */
unsigned int period; /* in nanoseconds */
unsigned int duty_cycle; /* in nanoseconds */
enum pwm_polarity polarity;
};
static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
@ -100,6 +103,17 @@ static inline unsigned int pwm_get_period(struct pwm_device *pwm)
return pwm ? pwm->period : 0;
}
static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
{
if (pwm)
pwm->duty_cycle = duty;
}
static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm)
{
return pwm ? pwm->duty_cycle : 0;
}
/*
* pwm_set_polarity - configure the polarity of a PWM signal
*/
@ -278,4 +292,17 @@ static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
}
#endif
#ifdef CONFIG_PWM_SYSFS
void pwmchip_sysfs_export(struct pwm_chip *chip);
void pwmchip_sysfs_unexport(struct pwm_chip *chip);
#else
static inline void pwmchip_sysfs_export(struct pwm_chip *chip)
{
}
static inline void pwmchip_sysfs_unexport(struct pwm_chip *chip)
{
}
#endif /* CONFIG_PWM_SYSFS */
#endif /* __LINUX_PWM_H */