From: Thierry Reding Date: Fri, 31 Aug 2012 09:46:24 +0000 (+0200) Subject: pwm: Move AB8500 PWM driver to PWM framework X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6173f8f4ed9c2bd4184908e35f46755a0d14b0f2;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Acked-by: Linus Walleij Acked-by: Arnd Bergmann Acked-by: Arun Murthy --- diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 98a442da892a..041b656c4ca4 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -60,16 +60,6 @@ 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 && ARCH_U8500 - select HAVE_PWM - depends on !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 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 b88df7a350b8..2129377c0de6 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -44,7 +44,6 @@ obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o obj-$(CONFIG_PCH_PHUB) += pch_phub.o obj-y += ti-st/ -obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o obj-y += lis3lv02d/ obj-y += carma/ obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o diff --git a/drivers/misc/ab8500-pwm.c b/drivers/misc/ab8500-pwm.c deleted file mode 100644 index d7a9aa14e5d5..000000000000 --- a/drivers/misc/ab8500-pwm.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * Copyright (C) ST-Ericsson SA 2010 - * - * Author: Arun R Murthy - * License terms: GNU General Public License (GPL) version 2 - */ -#include -#include -#include -#include -#include -#include -#include - -/* - * 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 - -struct pwm_device { - struct device *dev; - struct list_head node; - const char *label; - unsigned int pwm_id; -}; - -static LIST_HEAD(pwm_list); - -int 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(pwm->dev, AB8500_MISC, - reg, (u8)lower_val); - if (ret < 0) - return ret; - ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC, - (reg + 1), (u8)higher_val); - - return ret; -} -EXPORT_SYMBOL(pwm_config); - -int pwm_enable(struct pwm_device *pwm) -{ - int ret; - - ret = abx500_mask_and_set_register_interruptible(pwm->dev, - AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, - 1 << (pwm->pwm_id-1), ENABLE_PWM); - if (ret < 0) - dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n", - pwm->label, ret); - return ret; -} -EXPORT_SYMBOL(pwm_enable); - -void pwm_disable(struct pwm_device *pwm) -{ - int ret; - - ret = abx500_mask_and_set_register_interruptible(pwm->dev, - 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->label, ret); - return; -} -EXPORT_SYMBOL(pwm_disable); - -struct pwm_device *pwm_request(int pwm_id, const char *label) -{ - struct pwm_device *pwm; - - list_for_each_entry(pwm, &pwm_list, node) { - if (pwm->pwm_id == pwm_id) { - pwm->label = label; - pwm->pwm_id = pwm_id; - return pwm; - } - } - - return ERR_PTR(-ENOENT); -} -EXPORT_SYMBOL(pwm_request); - -void pwm_free(struct pwm_device *pwm) -{ - pwm_disable(pwm); -} -EXPORT_SYMBOL(pwm_free); - -static int __devinit ab8500_pwm_probe(struct platform_device *pdev) -{ - struct pwm_device *pwm; - /* - * Nothing to be done in probe, this is required to get the - * device which is required for ab8500 read and write - */ - pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); - if (pwm == NULL) { - dev_err(&pdev->dev, "failed to allocate memory\n"); - return -ENOMEM; - } - pwm->dev = &pdev->dev; - pwm->pwm_id = pdev->id; - list_add_tail(&pwm->node, &pwm_list); - platform_set_drvdata(pdev, pwm); - dev_dbg(pwm->dev, "pwm probe successful\n"); - return 0; -} - -static int __devexit ab8500_pwm_remove(struct platform_device *pdev) -{ - struct pwm_device *pwm = platform_get_drvdata(pdev); - list_del(&pwm->node); - dev_dbg(&pdev->dev, "pwm driver removed\n"); - kfree(pwm); - 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 "); -MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); -MODULE_ALIAS("platform:ab8500-pwm"); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 90c5c7357a50..99a738182bf5 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -29,6 +29,15 @@ menuconfig PWM if PWM +config PWM_AB8500 + tristate "AB8500 PWM support" + depends on AB8500_CORE && ARCH_U8500 + help + Generic PWM framework driver for Analog Baseband AB8500. + + To compile this driver as a module, choose M here: the module + will be called pwm-ab8500. + config PWM_BFIN tristate "Blackfin PWM support" depends on BFIN_GPTIMERS diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index e4b2c898964d..bebc6ff904b9 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_PWM) += core.o +obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o obj-$(CONFIG_PWM_IMX) += pwm-imx.o obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c new file mode 100644 index 000000000000..cfb72ca873d1 --- /dev/null +++ b/drivers/pwm/pwm-ab8500.c @@ -0,0 +1,153 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Arun R Murthy + * License terms: GNU General Public License (GPL) version 2 + */ +#include +#include +#include +#include +#include +#include +#include + +/* + * 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 + +struct ab8500_pwm_chip { + struct pwm_chip chip; +}; + +static int ab8500_pwm_config(struct pwm_chip *chip, 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 + ((chip->base - 1) * 2); + + ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, + reg, (u8)lower_val); + if (ret < 0) + return ret; + ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, + (reg + 1), (u8)higher_val); + + return ret; +} + +static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + int ret; + + ret = abx500_mask_and_set_register_interruptible(chip->dev, + AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, + 1 << (chip->base - 1), ENABLE_PWM); + if (ret < 0) + dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n", + pwm->label, ret); + return ret; +} + +static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + int ret; + + ret = abx500_mask_and_set_register_interruptible(chip->dev, + AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, + 1 << (chip->base - 1), DISABLE_PWM); + if (ret < 0) + dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n", + pwm->label, ret); + return; +} + +static const struct pwm_ops ab8500_pwm_ops = { + .config = ab8500_pwm_config, + .enable = ab8500_pwm_enable, + .disable = ab8500_pwm_disable, +}; + +static int __devinit ab8500_pwm_probe(struct platform_device *pdev) +{ + struct ab8500_pwm_chip *ab8500; + int err; + + /* + * Nothing to be done in probe, this is required to get the + * device which is required for ab8500 read and write + */ + ab8500 = kzalloc(sizeof(*ab8500), GFP_KERNEL); + if (ab8500 == NULL) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + ab8500->chip.dev = &pdev->dev; + ab8500->chip.ops = &ab8500_pwm_ops; + ab8500->chip.base = pdev->id; + ab8500->chip.npwm = 1; + + err = pwmchip_add(&ab8500->chip); + if (err < 0) { + kfree(ab8500); + return err; + } + + dev_dbg(&pdev->dev, "pwm probe successful\n"); + platform_set_drvdata(pdev, ab8500); + + return 0; +} + +static int __devexit ab8500_pwm_remove(struct platform_device *pdev) +{ + struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev); + int err; + + err = pwmchip_remove(&ab8500->chip); + if (err < 0) + return err; + + dev_dbg(&pdev->dev, "pwm driver removed\n"); + kfree(ab8500); + + 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), +}; +module_platform_driver(ab8500_pwm_driver); + +MODULE_AUTHOR("Arun MURTHY "); +MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); +MODULE_ALIAS("platform:ab8500-pwm"); +MODULE_LICENSE("GPL v2");