leds: Remove leds-renesas-tpu driver

The driver is superseded by the generic pwm-renesas-tpu driver used with
leds-pwm.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

drivers/leds/Kconfig

@@ -429,18 +429,6 @@ config LEDS_ASIC3
 	  cannot be used. This driver supports hardware blinking with an on+off
 	  period from 62ms to 125s. Say Y to enable LEDs on the HP iPAQ hx4700.
 
-config LEDS_RENESAS_TPU
-	bool "LED support for Renesas TPU"
-	depends on LEDS_CLASS=y && HAVE_CLK && GPIOLIB
-	help
-	  This option enables build of the LED TPU platform driver,
-	  suitable to drive any TPU channel on newer Renesas SoCs.
-	  The driver controls the GPIO pin connected to the LED via
-	  the GPIO framework and expects the LED to be connected to
-	  a pin that can be driven in both GPIO mode and using TPU
-	  pin function. The latter to support brightness control.
-	  Brightness control is supported but hardware blinking is not.
-
 config LEDS_TCA6507
 	tristate "LED Support for TCA6507 I2C chip"
 	depends on LEDS_CLASS && I2C

drivers/leds/Makefile

@@ -49,7 +49,6 @@ obj-$(CONFIG_LEDS_MC13783)		+= leds-mc13783.o
 obj-$(CONFIG_LEDS_NS2)			+= leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
-obj-$(CONFIG_LEDS_RENESAS_TPU)		+= leds-renesas-tpu.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o
 obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o

drivers/leds/leds-renesas-tpu.c

-/*
- * LED control using Renesas TPU
- *
- *  Copyright (C) 2011 Magnus Damm
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-#include <linux/printk.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/leds.h>
-#include <linux/platform_data/leds-renesas-tpu.h>
-#include <linux/gpio.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/pm_runtime.h>
-#include <linux/workqueue.h>
-
-enum r_tpu_pin { R_TPU_PIN_UNUSED, R_TPU_PIN_GPIO, R_TPU_PIN_GPIO_FN };
-enum r_tpu_timer { R_TPU_TIMER_UNUSED, R_TPU_TIMER_ON };
-
-struct r_tpu_priv {
-	struct led_classdev ldev;
-	void __iomem *mapbase;
-	struct clk *clk;
-	struct platform_device *pdev;
-	enum r_tpu_pin pin_state;
-	enum r_tpu_timer timer_state;
-	unsigned long min_rate;
-	unsigned int refresh_rate;
-	struct work_struct work;
-	enum led_brightness new_brightness;
-};
-
-static DEFINE_SPINLOCK(r_tpu_lock);
-
-#define TSTR -1 /* Timer start register (shared register) */
-#define TCR  0 /* Timer control register (+0x00) */
-#define TMDR 1 /* Timer mode register (+0x04) */
-#define TIOR 2 /* Timer I/O control register (+0x08) */
-#define TIER 3 /* Timer interrupt enable register (+0x0c) */
-#define TSR  4 /* Timer status register (+0x10) */
-#define TCNT 5 /* Timer counter (+0x14) */
-#define TGRA 6 /* Timer general register A (+0x18) */
-#define TGRB 7 /* Timer general register B (+0x1c) */
-#define TGRC 8 /* Timer general register C (+0x20) */
-#define TGRD 9 /* Timer general register D (+0x24) */
-
-static inline u16 r_tpu_read(struct r_tpu_priv *p, int reg_nr)
-{
-	struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data;
-	void __iomem *base = p->mapbase;
-	unsigned long offs = reg_nr << 2;
-
-	if (reg_nr == TSTR)
-		return ioread16(base - cfg->channel_offset);
-
-	return ioread16(base + offs);
-}
-
-static inline void r_tpu_write(struct r_tpu_priv *p, int reg_nr, u16 value)
-{
-	struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data;
-	void __iomem *base = p->mapbase;
-	unsigned long offs = reg_nr << 2;
-
-	if (reg_nr == TSTR) {
-		iowrite16(value, base - cfg->channel_offset);
-		return;
-	}
-
-	iowrite16(value, base + offs);
-}
-
-static void r_tpu_start_stop_ch(struct r_tpu_priv *p, int start)
-{
-	struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data;
-	unsigned long flags;
-	u16 value;
-
-	/* start stop register shared by multiple timer channels */
-	spin_lock_irqsave(&r_tpu_lock, flags);
-	value = r_tpu_read(p, TSTR);
-
-	if (start)
-		value |= 1 << cfg->timer_bit;
-	else
-		value &= ~(1 << cfg->timer_bit);
-
-	r_tpu_write(p, TSTR, value);
-	spin_unlock_irqrestore(&r_tpu_lock, flags);
-}
-
-static int r_tpu_enable(struct r_tpu_priv *p, enum led_brightness brightness)
-{
-	struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data;
-	int prescaler[] = { 1, 4, 16, 64 };
-	int k, ret;
-	unsigned long rate, tmp;
-
-	if (p->timer_state == R_TPU_TIMER_ON)
-		return 0;
-
-	/* wake up device and enable clock */
-	pm_runtime_get_sync(&p->pdev->dev);
-	ret = clk_enable(p->clk);
-	if (ret) {
-		dev_err(&p->pdev->dev, "cannot enable clock\n");
-		return ret;
-	}
-
-	/* make sure channel is disabled */
-	r_tpu_start_stop_ch(p, 0);
-
-	/* get clock rate after enabling it */
-	rate = clk_get_rate(p->clk);
-
-	/* pick the lowest acceptable rate */
-	for (k = ARRAY_SIZE(prescaler) - 1; k >= 0; k--)
-		if ((rate / prescaler[k]) >= p->min_rate)
-			break;
-
-	if (k < 0) {
-		dev_err(&p->pdev->dev, "clock rate mismatch\n");
-		goto err0;
-	}
-	dev_dbg(&p->pdev->dev, "rate = %lu, prescaler %u\n",
-		rate, prescaler[k]);
-
-	/* clear TCNT on TGRB match, count on rising edge, set prescaler */
-	r_tpu_write(p, TCR, 0x0040 | k);
-
-	/* output 0 until TGRA, output 1 until TGRB */
-	r_tpu_write(p, TIOR, 0x0002);
-
-	rate /= prescaler[k] * p->refresh_rate;
-	r_tpu_write(p, TGRB, rate);
-	dev_dbg(&p->pdev->dev, "TRGB = 0x%04lx\n", rate);
-
-	tmp = (cfg->max_brightness - brightness) * rate;
-	r_tpu_write(p, TGRA, tmp / cfg->max_brightness);
-	dev_dbg(&p->pdev->dev, "TRGA = 0x%04lx\n", tmp / cfg->max_brightness);
-
-	/* PWM mode */
-	r_tpu_write(p, TMDR, 0x0002);
-
-	/* enable channel */
-	r_tpu_start_stop_ch(p, 1);
-
-	p->timer_state = R_TPU_TIMER_ON;
-	return 0;
- err0:
-	clk_disable(p->clk);
-	pm_runtime_put_sync(&p->pdev->dev);
-	return -ENOTSUPP;
-}
-
-static void r_tpu_disable(struct r_tpu_priv *p)
-{
-	if (p->timer_state == R_TPU_TIMER_UNUSED)
-		return;
-
-	/* disable channel */
-	r_tpu_start_stop_ch(p, 0);
-
-	/* stop clock and mark device as idle */
-	clk_disable(p->clk);
-	pm_runtime_put_sync(&p->pdev->dev);
-
-	p->timer_state = R_TPU_TIMER_UNUSED;
-}
-
-static void r_tpu_set_pin(struct r_tpu_priv *p, enum r_tpu_pin new_state,
-			  enum led_brightness brightness)
-{
-	struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data;
-
-	if (p->pin_state == new_state) {
-		if (p->pin_state == R_TPU_PIN_GPIO)
-			gpio_set_value(cfg->pin_gpio, brightness);
-		return;
-	}
-
-	if (p->pin_state == R_TPU_PIN_GPIO)
-		gpio_free(cfg->pin_gpio);
-
-	if (p->pin_state == R_TPU_PIN_GPIO_FN)
-		gpio_free(cfg->pin_gpio_fn);
-
-	if (new_state == R_TPU_PIN_GPIO)
-		gpio_request_one(cfg->pin_gpio, !!brightness ?
-				GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
-				cfg->name);
-
-	if (new_state == R_TPU_PIN_GPIO_FN)
-		gpio_request(cfg->pin_gpio_fn, cfg->name);
-
-	p->pin_state = new_state;
-}
-
-static void r_tpu_work(struct work_struct *work)
-{
-	struct r_tpu_priv *p = container_of(work, struct r_tpu_priv, work);
-	enum led_brightness brightness = p->new_brightness;
-
-	r_tpu_disable(p);
-
-	/* off and maximum are handled as GPIO pins, in between PWM */
-	if ((brightness == 0) || (brightness == p->ldev.max_brightness))
-		r_tpu_set_pin(p, R_TPU_PIN_GPIO, brightness);
-	else {
-		r_tpu_set_pin(p, R_TPU_PIN_GPIO_FN, 0);
-		r_tpu_enable(p, brightness);
-	}
-}
-
-static void r_tpu_set_brightness(struct led_classdev *ldev,
-				 enum led_brightness brightness)
-{
-	struct r_tpu_priv *p = container_of(ldev, struct r_tpu_priv, ldev);
-	p->new_brightness = brightness;
-	schedule_work(&p->work);
-}
-
-static int r_tpu_probe(struct platform_device *pdev)
-{
-	struct led_renesas_tpu_config *cfg = pdev->dev.platform_data;
-	struct r_tpu_priv *p;
-	struct resource *res;
-	int ret;
-
-	if (!cfg) {
-		dev_err(&pdev->dev, "missing platform data\n");
-		return -ENODEV;
-	}
-
-	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
-	if (p == NULL) {
-		dev_err(&pdev->dev, "failed to allocate driver data\n");
-		return -ENOMEM;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get I/O memory\n");
-		return -ENXIO;
-	}
-
-	/* map memory, let mapbase point to our channel */
-	p->mapbase = devm_ioremap_nocache(&pdev->dev, res->start,
-					resource_size(res));
-	if (p->mapbase == NULL) {
-		dev_err(&pdev->dev, "failed to remap I/O memory\n");
-		return -ENXIO;
-	}
-
-	/* get hold of clock */
-	p->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(p->clk)) {
-		dev_err(&pdev->dev, "cannot get clock\n");
-		return PTR_ERR(p->clk);
-	}
-
-	p->pdev = pdev;
-	p->pin_state = R_TPU_PIN_UNUSED;
-	p->timer_state = R_TPU_TIMER_UNUSED;
-	p->refresh_rate = cfg->refresh_rate ? cfg->refresh_rate : 100;
-	r_tpu_set_pin(p, R_TPU_PIN_GPIO, LED_OFF);
-	platform_set_drvdata(pdev, p);
-
-	INIT_WORK(&p->work, r_tpu_work);
-
-	p->ldev.name = cfg->name;
-	p->ldev.brightness = LED_OFF;
-	p->ldev.max_brightness = cfg->max_brightness;
-	p->ldev.brightness_set = r_tpu_set_brightness;
-	p->ldev.flags |= LED_CORE_SUSPENDRESUME;
-	ret = led_classdev_register(&pdev->dev, &p->ldev);
-	if (ret < 0)
-		goto err0;
-
-	/* max_brightness may be updated by the LED core code */
-	p->min_rate = p->ldev.max_brightness * p->refresh_rate;
-
-	pm_runtime_enable(&pdev->dev);
-	return 0;
-
- err0:
-	r_tpu_set_pin(p, R_TPU_PIN_UNUSED, LED_OFF);
-	return ret;
-}
-
-static int r_tpu_remove(struct platform_device *pdev)
-{
-	struct r_tpu_priv *p = platform_get_drvdata(pdev);
-
-	r_tpu_set_brightness(&p->ldev, LED_OFF);
-	led_classdev_unregister(&p->ldev);
-	cancel_work_sync(&p->work);
-	r_tpu_disable(p);
-	r_tpu_set_pin(p, R_TPU_PIN_UNUSED, LED_OFF);
-
-	pm_runtime_disable(&pdev->dev);
-
-	return 0;
-}
-
-static struct platform_driver r_tpu_device_driver = {
-	.probe		= r_tpu_probe,
-	.remove		= r_tpu_remove,
-	.driver		= {
-		.name	= "leds-renesas-tpu",
-	}
-};
-
-module_platform_driver(r_tpu_device_driver);
-
-MODULE_AUTHOR("Magnus Damm");
-MODULE_DESCRIPTION("Renesas TPU LED Driver");
-MODULE_LICENSE("GPL v2");

include/linux/platform_data/leds-renesas-tpu.h

-#ifndef __LEDS_RENESAS_TPU_H__
-#define __LEDS_RENESAS_TPU_H__
-
-struct led_renesas_tpu_config {
-	char *name;
-	unsigned pin_gpio_fn;
-	unsigned pin_gpio;
-	unsigned int channel_offset;
-	unsigned int timer_bit;
-	unsigned int max_brightness;
-	unsigned int refresh_rate;
-};
-
-#endif /* __LEDS_RENESAS_TPU_H__ */