forked from mirrors/linux
pwm: Move AB8500 PWM driver to PWM framework
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Arun Murthy <arun.murthy@stericsson.com>
This commit is contained in:
Thierry Reding
parent
0bcf168b02
commit
6173f8f4ed
5 changed files with 60 additions and 77 deletions
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@ -60,16 +60,6 @@ config ATMEL_PWM
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purposes including software controlled power-efficient backlights
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on LCD displays, motor control, and waveform generation.
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config AB8500_PWM
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bool "AB8500 PWM support"
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depends on AB8500_CORE && ARCH_U8500
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select HAVE_PWM
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depends on !PWM
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help
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This driver exports functions to enable/disble/config/free Pulse
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Width Modulation in the Analog Baseband Chip AB8500.
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It is used by led and backlight driver to control the intensity.
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config ATMEL_TCLIB
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bool "Atmel AT32/AT91 Timer/Counter Library"
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depends on (AVR32 || ARCH_AT91)
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@ -44,7 +44,6 @@ obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
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obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
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obj-$(CONFIG_PCH_PHUB) += pch_phub.o
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obj-y += ti-st/
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obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
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obj-y += lis3lv02d/
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obj-y += carma/
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obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
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@ -29,6 +29,15 @@ menuconfig PWM
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if PWM
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config PWM_AB8500
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tristate "AB8500 PWM support"
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depends on AB8500_CORE && ARCH_U8500
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help
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Generic PWM framework driver for Analog Baseband AB8500.
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To compile this driver as a module, choose M here: the module
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will be called pwm-ab8500.
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config PWM_BFIN
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tristate "Blackfin PWM support"
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depends on BFIN_GPTIMERS
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@ -1,4 +1,5 @@
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obj-$(CONFIG_PWM) += core.o
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obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
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obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
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obj-$(CONFIG_PWM_IMX) += pwm-imx.o
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obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
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@ -24,16 +24,12 @@
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#define ENABLE_PWM 1
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#define DISABLE_PWM 0
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struct pwm_device {
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struct device *dev;
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struct list_head node;
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const char *label;
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unsigned int pwm_id;
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struct ab8500_pwm_chip {
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struct pwm_chip chip;
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};
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static LIST_HEAD(pwm_list);
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int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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int ret = 0;
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unsigned int higher_val, lower_val;
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@ -50,95 +46,94 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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*/
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higher_val = ((duty_ns & 0x0300) >> 8);
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reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2);
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reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
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ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
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ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
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reg, (u8)lower_val);
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if (ret < 0)
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return ret;
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ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
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ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
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(reg + 1), (u8)higher_val);
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return ret;
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}
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EXPORT_SYMBOL(pwm_config);
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int pwm_enable(struct pwm_device *pwm)
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static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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int ret;
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ret = abx500_mask_and_set_register_interruptible(pwm->dev,
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ret = abx500_mask_and_set_register_interruptible(chip->dev,
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AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
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1 << (pwm->pwm_id-1), ENABLE_PWM);
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1 << (chip->base - 1), ENABLE_PWM);
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if (ret < 0)
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dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
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dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
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pwm->label, ret);
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return ret;
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}
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EXPORT_SYMBOL(pwm_enable);
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void pwm_disable(struct pwm_device *pwm)
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static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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int ret;
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ret = abx500_mask_and_set_register_interruptible(pwm->dev,
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ret = abx500_mask_and_set_register_interruptible(chip->dev,
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AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
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1 << (pwm->pwm_id-1), DISABLE_PWM);
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1 << (chip->base - 1), DISABLE_PWM);
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if (ret < 0)
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dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
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dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
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pwm->label, ret);
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return;
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}
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EXPORT_SYMBOL(pwm_disable);
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struct pwm_device *pwm_request(int pwm_id, const char *label)
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{
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struct pwm_device *pwm;
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list_for_each_entry(pwm, &pwm_list, node) {
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if (pwm->pwm_id == pwm_id) {
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pwm->label = label;
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pwm->pwm_id = pwm_id;
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return pwm;
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}
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}
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return ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL(pwm_request);
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void pwm_free(struct pwm_device *pwm)
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{
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pwm_disable(pwm);
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}
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EXPORT_SYMBOL(pwm_free);
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static const struct pwm_ops ab8500_pwm_ops = {
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.config = ab8500_pwm_config,
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.enable = ab8500_pwm_enable,
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.disable = ab8500_pwm_disable,
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};
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static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
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{
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struct pwm_device *pwm;
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struct ab8500_pwm_chip *ab8500;
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int err;
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/*
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* Nothing to be done in probe, this is required to get the
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* device which is required for ab8500 read and write
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*/
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pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
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if (pwm == NULL) {
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ab8500 = kzalloc(sizeof(*ab8500), GFP_KERNEL);
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if (ab8500 == NULL) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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pwm->dev = &pdev->dev;
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pwm->pwm_id = pdev->id;
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list_add_tail(&pwm->node, &pwm_list);
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platform_set_drvdata(pdev, pwm);
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dev_dbg(pwm->dev, "pwm probe successful\n");
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ab8500->chip.dev = &pdev->dev;
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ab8500->chip.ops = &ab8500_pwm_ops;
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ab8500->chip.base = pdev->id;
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ab8500->chip.npwm = 1;
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err = pwmchip_add(&ab8500->chip);
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if (err < 0) {
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kfree(ab8500);
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return err;
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}
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dev_dbg(&pdev->dev, "pwm probe successful\n");
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platform_set_drvdata(pdev, ab8500);
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return 0;
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}
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static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
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{
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struct pwm_device *pwm = platform_get_drvdata(pdev);
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list_del(&pwm->node);
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struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
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int err;
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err = pwmchip_remove(&ab8500->chip);
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if (err < 0)
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return err;
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dev_dbg(&pdev->dev, "pwm driver removed\n");
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kfree(pwm);
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kfree(ab8500);
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return 0;
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}
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@ -150,19 +145,8 @@ static struct platform_driver ab8500_pwm_driver = {
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.probe = ab8500_pwm_probe,
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.remove = __devexit_p(ab8500_pwm_remove),
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};
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module_platform_driver(ab8500_pwm_driver);
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static int __init ab8500_pwm_init(void)
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{
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return platform_driver_register(&ab8500_pwm_driver);
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}
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static void __exit ab8500_pwm_exit(void)
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{
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platform_driver_unregister(&ab8500_pwm_driver);
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}
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subsys_initcall(ab8500_pwm_init);
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module_exit(ab8500_pwm_exit);
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MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
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MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
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MODULE_ALIAS("platform:ab8500-pwm");
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