input: TSC: ti_tsc: Convert TSC into a MFDevice

This patch converts touchscreen into a MFD client.
All the register definitions, clock initialization,
etc has been moved to MFD core driver.
Signed-off-by: NPatil, Rachna <rachna@ti.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/input/touchscreen/Kconfig

@@ -531,7 +531,7 @@ config TOUCHSCREEN_TOUCHWIN
 
 config TOUCHSCREEN_TI_AM335X_TSC
 	tristate "TI Touchscreen Interface"
-	depends on ARCH_OMAP2PLUS
+	depends on MFD_TI_AM335X_TSCADC
 	help
 	  Say Y here if you have 4/5/8 wire touchscreen controller
 	  to be connected to the ADC controller on your TI AM335x SoC.

drivers/input/touchscreen/ti_am335x_tsc.c

@@ -27,106 +27,15 @@
 #include <linux/input/ti_am335x_tsc.h>
 #include <linux/delay.h>
 
-#define REG_RAWIRQSTATUS	0x024
-#define REG_IRQSTATUS		0x028
-#define REG_IRQENABLE		0x02C
-#define REG_IRQWAKEUP		0x034
-#define REG_CTRL		0x040
-#define REG_ADCFSM		0x044
-#define REG_CLKDIV		0x04C
-#define REG_SE			0x054
-#define REG_IDLECONFIG		0x058
-#define REG_CHARGECONFIG	0x05C
-#define REG_CHARGEDELAY		0x060
-#define REG_STEPCONFIG(n)	(0x64 + ((n - 1) * 8))
-#define REG_STEPDELAY(n)	(0x68 + ((n - 1) * 8))
-#define REG_FIFO0CNT		0xE4
-#define REG_FIFO0THR		0xE8
-#define REG_FIFO1THR		0xF4
-#define REG_FIFO0		0x100
-#define REG_FIFO1		0x200
-
-/*	Register Bitfields	*/
-#define IRQWKUP_ENB		BIT(0)
-
-/* Step Enable */
-#define STEPENB_MASK		(0x1FFFF << 0)
-#define STEPENB(val)		(val << 0)
-#define STPENB_STEPENB		STEPENB(0x7FFF)
-
-/* IRQ enable */
-#define IRQENB_FIFO0THRES	BIT(2)
-#define IRQENB_FIFO1THRES	BIT(5)
-#define IRQENB_PENUP		BIT(9)
-
-/* Step Configuration */
-#define STEPCONFIG_MODE_MASK	(3 << 0)
-#define STEPCONFIG_MODE(val)	(val << 0)
-#define STEPCONFIG_MODE_HWSYNC	STEPCONFIG_MODE(2)
-#define STEPCONFIG_AVG_MASK	(7 << 2)
-#define STEPCONFIG_AVG(val)	(val << 2)
-#define STEPCONFIG_AVG_16	STEPCONFIG_AVG(4)
-#define STEPCONFIG_XPP		BIT(5)
-#define STEPCONFIG_XNN		BIT(6)
-#define STEPCONFIG_YPP		BIT(7)
-#define STEPCONFIG_YNN		BIT(8)
-#define STEPCONFIG_XNP		BIT(9)
-#define STEPCONFIG_YPN		BIT(10)
-#define STEPCONFIG_INM_MASK	(0xF << 15)
-#define STEPCONFIG_INM(val)	(val << 15)
-#define STEPCONFIG_INM_ADCREFM	STEPCONFIG_INM(8)
-#define STEPCONFIG_INP_MASK	(0xF << 19)
-#define STEPCONFIG_INP(val)	(val << 19)
-#define STEPCONFIG_INP_AN2	STEPCONFIG_INP(2)
-#define STEPCONFIG_INP_AN3	STEPCONFIG_INP(3)
-#define STEPCONFIG_INP_AN4	STEPCONFIG_INP(4)
-#define STEPCONFIG_INP_ADCREFM	STEPCONFIG_INP(8)
-#define STEPCONFIG_FIFO1	BIT(26)
-
-/* Delay register */
-#define STEPDELAY_OPEN_MASK	(0x3FFFF << 0)
-#define STEPDELAY_OPEN(val)	(val << 0)
-#define STEPCONFIG_OPENDLY	STEPDELAY_OPEN(0x098)
-
-/* Charge Config */
-#define STEPCHARGE_RFP_MASK	(7 << 12)
-#define STEPCHARGE_RFP(val)	(val << 12)
-#define STEPCHARGE_RFP_XPUL	STEPCHARGE_RFP(1)
-#define STEPCHARGE_INM_MASK	(0xF << 15)
-#define STEPCHARGE_INM(val)	(val << 15)
-#define STEPCHARGE_INM_AN1	STEPCHARGE_INM(1)
-#define STEPCHARGE_INP_MASK	(0xF << 19)
-#define STEPCHARGE_INP(val)	(val << 19)
-#define STEPCHARGE_INP_AN1	STEPCHARGE_INP(1)
-#define STEPCHARGE_RFM_MASK	(3 << 23)
-#define STEPCHARGE_RFM(val)	(val << 23)
-#define STEPCHARGE_RFM_XNUR	STEPCHARGE_RFM(1)
-
-/* Charge delay */
-#define CHARGEDLY_OPEN_MASK	(0x3FFFF << 0)
-#define CHARGEDLY_OPEN(val)	(val << 0)
-#define CHARGEDLY_OPENDLY	CHARGEDLY_OPEN(1)
-
-/* Control register */
-#define CNTRLREG_TSCSSENB	BIT(0)
-#define CNTRLREG_STEPID		BIT(1)
-#define CNTRLREG_STEPCONFIGWRT	BIT(2)
-#define CNTRLREG_AFE_CTRL_MASK	(3 << 5)
-#define CNTRLREG_AFE_CTRL(val)	(val << 5)
-#define CNTRLREG_4WIRE		CNTRLREG_AFE_CTRL(1)
-#define CNTRLREG_5WIRE		CNTRLREG_AFE_CTRL(2)
-#define CNTRLREG_8WIRE		CNTRLREG_AFE_CTRL(3)
-#define CNTRLREG_TSCENB		BIT(7)
+#include <linux/mfd/ti_am335x_tscadc.h>
 
 #define ADCFSM_STEPID		0x10
 #define SEQ_SETTLE		275
-#define ADC_CLK			3000000
 #define MAX_12BIT		((1 << 12) - 1)
 
 struct titsc {
 	struct input_dev	*input;
-	struct clk		*tsc_ick;
-	void __iomem		*tsc_base;
+	struct ti_tscadc_dev	*mfd_tscadc;
 	unsigned int		irq;
 	unsigned int		wires;
 	unsigned int		x_plate_resistance;
@@ -136,13 +45,13 @@ struct titsc {
 
 static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
 {
-	return readl(ts->tsc_base + reg);
+	return readl(ts->mfd_tscadc->tscadc_base + reg);
 }
 
 static void titsc_writel(struct titsc *tsc, unsigned int reg,
 					unsigned int val)
 {
-	writel(val, tsc->tsc_base + reg);
+	writel(val, tsc->mfd_tscadc->tscadc_base + reg);
 }
 
 static void titsc_step_config(struct titsc *ts_dev)
@@ -219,17 +128,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
 			STEPCONFIG_OPENDLY);
 
-	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB);
-}
-
-static void titsc_idle_config(struct titsc *ts_config)
-{
-	unsigned int idleconfig;
-
-	idleconfig = STEPCONFIG_YNN |
-			STEPCONFIG_INM_ADCREFM |
-			STEPCONFIG_YPN | STEPCONFIG_INP_ADCREFM;
-	titsc_writel(ts_config, REG_IDLECONFIG, idleconfig);
+	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB_TC);
 }
 
 static void titsc_read_coordinates(struct titsc *ts_dev,
@@ -239,7 +138,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
 	unsigned int prev_val_x = ~0, prev_val_y = ~0;
 	unsigned int prev_diff_x = ~0, prev_diff_y = ~0;
 	unsigned int read, diff;
-	unsigned int i;
+	unsigned int i, channel;
 
 	/*
 	 * Delta filter is used to remove large variations in sampled
@@ -250,21 +149,32 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
 	 * if true the value is reported to the sub system.
 	 */
 	for (i = 0; i < fifocount - 1; i++) {
-		read = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
-		diff = abs(read - prev_val_x);
-		if (diff < prev_diff_x) {
-			prev_diff_x = diff;
-			*x = read;
+		read = titsc_readl(ts_dev, REG_FIFO0);
+		channel = read & 0xf0000;
+		channel = channel >> 0x10;
+		if ((channel >= 0) && (channel < ts_dev->steps_to_configure)) {
+			read &= 0xfff;
+			diff = abs(read - prev_val_x);
+			if (diff < prev_diff_x) {
+				prev_diff_x = diff;
+				*x = read;
+			}
+			prev_val_x = read;
 		}
-		prev_val_x = read;
 
-		read = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
-		diff = abs(read - prev_val_y);
-		if (diff < prev_diff_y) {
-			prev_diff_y = diff;
-			*y = read;
+		read = titsc_readl(ts_dev, REG_FIFO1);
+		channel = read & 0xf0000;
+		channel = channel >> 0x10;
+		if ((channel >= ts_dev->steps_to_configure) &&
+			(channel < (2 * ts_dev->steps_to_configure - 1))) {
+			read &= 0xfff;
+			diff = abs(read - prev_val_y);
+			if (diff < prev_diff_y) {
+				prev_diff_y = diff;
+				*y = read;
+			}
+			prev_val_y = read;
 		}
-		prev_val_y = read;
 	}
 }
 
@@ -276,6 +186,8 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 	unsigned int x = 0, y = 0;
 	unsigned int z1, z2, z;
 	unsigned int fsm;
+	unsigned int fifo1count, fifo0count;
+	int i;
 
 	status = titsc_readl(ts_dev, REG_IRQSTATUS);
 	if (status & IRQENB_FIFO0THRES) {
@@ -284,6 +196,14 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
 		z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
 
+		fifo1count = titsc_readl(ts_dev, REG_FIFO1CNT);
+		for (i = 0; i < fifo1count; i++)
+			titsc_readl(ts_dev, REG_FIFO1);
+
+		fifo0count = titsc_readl(ts_dev, REG_FIFO0CNT);
+		for (i = 0; i < fifo0count; i++)
+			titsc_readl(ts_dev, REG_FIFO0);
+
 		if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
 			/*
 			 * Calculate pressure using formula
@@ -330,7 +250,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 
 	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
 
-	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB);
+	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB_TC);
 	return IRQ_HANDLED;
 }
 
@@ -340,28 +260,16 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 
 static int __devinit titsc_probe(struct platform_device *pdev)
 {
-	const struct tsc_data *pdata = pdev->dev.platform_data;
-	struct resource *res;
 	struct titsc *ts_dev;
 	struct input_dev *input_dev;
-	struct clk *clk;
+	struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
+	struct mfd_tscadc_board	*pdata;
 	int err;
-	int clk_value, ctrl, irq;
 
-	if (!pdata) {
-		dev_err(&pdev->dev, "missing platform data.\n");
-		return -EINVAL;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no memory resource defined.\n");
-		return -EINVAL;
-	}
+	pdata = tscadc_dev->dev->platform_data;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "no irq ID is specified.\n");
+	if (!pdata) {
+		dev_err(&pdev->dev, "Could not find platform data\n");
 		return -EINVAL;
 	}
 
@@ -374,85 +282,26 @@ static int __devinit titsc_probe(struct platform_device *pdev)
 		goto err_free_mem;
 	}
 
+	tscadc_dev->tsc = ts_dev;
+	ts_dev->mfd_tscadc = tscadc_dev;
 	ts_dev->input = input_dev;
-	ts_dev->irq = irq;
-	ts_dev->wires = pdata->wires;
-	ts_dev->x_plate_resistance = pdata->x_plate_resistance;
-	ts_dev->steps_to_configure = pdata->steps_to_configure;
-
-	res = request_mem_region(res->start, resource_size(res), pdev->name);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to reserve registers.\n");
-		err = -EBUSY;
-		goto err_free_mem;
-	}
-
-	ts_dev->tsc_base = ioremap(res->start, resource_size(res));
-	if (!ts_dev->tsc_base) {
-		dev_err(&pdev->dev, "failed to map registers.\n");
-		err = -ENOMEM;
-		goto err_release_mem_region;
-	}
+	ts_dev->irq = tscadc_dev->irq;
+	ts_dev->wires = pdata->tsc_init->wires;
+	ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
+	ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
 
 	err = request_irq(ts_dev->irq, titsc_irq,
 			  0, pdev->dev.driver->name, ts_dev);
 	if (err) {
 		dev_err(&pdev->dev, "failed to allocate irq.\n");
-		goto err_unmap_regs;
-	}
-
-	ts_dev->tsc_ick = clk_get(&pdev->dev, "adc_tsc_ick");
-	if (IS_ERR(ts_dev->tsc_ick)) {
-		dev_err(&pdev->dev, "failed to get TSC ick\n");
-		goto err_free_irq;
-	}
-	clk_enable(ts_dev->tsc_ick);
-
-	clk = clk_get(&pdev->dev, "adc_tsc_fck");
-	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev, "failed to get TSC fck\n");
-		err = PTR_ERR(clk);
-		goto err_disable_clk;
-	}
-
-	clk_value = clk_get_rate(clk) / ADC_CLK;
-	clk_put(clk);
-
-	if (clk_value < 7) {
-		dev_err(&pdev->dev, "clock input less than min clock requirement\n");
-		goto err_disable_clk;
-	}
-	/* CLKDIV needs to be configured to the value minus 1 */
-	titsc_writel(ts_dev, REG_CLKDIV, clk_value - 1);
-
-	 /* Enable wake-up of the SoC using touchscreen */
-	titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
-
-	ctrl = CNTRLREG_STEPCONFIGWRT |
-			CNTRLREG_TSCENB |
-			CNTRLREG_STEPID;
-	switch (ts_dev->wires) {
-	case 4:
-		ctrl |= CNTRLREG_4WIRE;
-		break;
-	case 5:
-		ctrl |= CNTRLREG_5WIRE;
-		break;
-	case 8:
-		ctrl |= CNTRLREG_8WIRE;
-		break;
+		goto err_free_mem;
 	}
-	titsc_writel(ts_dev, REG_CTRL, ctrl);
 
-	titsc_idle_config(ts_dev);
 	titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
 	titsc_step_config(ts_dev);
 	titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
 
-	ctrl |= CNTRLREG_TSCSSENB;
-	titsc_writel(ts_dev, REG_CTRL, ctrl);
-
-	input_dev->name = "ti-tsc-adc";
+	input_dev->name = "ti-tsc";
 	input_dev->dev.parent = &pdev->dev;
 
 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
@@ -465,20 +314,13 @@ static int __devinit titsc_probe(struct platform_device *pdev)
 	/* register to the input system */
 	err = input_register_device(input_dev);
 	if (err)
-		goto err_disable_clk;
+		goto err_free_irq;
 
 	platform_set_drvdata(pdev, ts_dev);
 	return 0;
 
-err_disable_clk:
-	clk_disable(ts_dev->tsc_ick);
-	clk_put(ts_dev->tsc_ick);
 err_free_irq:
 	free_irq(ts_dev->irq, ts_dev);
-err_unmap_regs:
-	iounmap(ts_dev->tsc_base);
-err_release_mem_region:
-	release_mem_region(res->start, resource_size(res));
 err_free_mem:
 	input_free_device(input_dev);
 	kfree(ts_dev);
@@ -487,32 +329,66 @@ static int __devinit titsc_probe(struct platform_device *pdev)
 
 static int __devexit titsc_remove(struct platform_device *pdev)
 {
-	struct titsc *ts_dev = platform_get_drvdata(pdev);
-	struct resource *res;
+	struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
+	struct titsc *ts_dev = tscadc_dev->tsc;
 
 	free_irq(ts_dev->irq, ts_dev);
 
 	input_unregister_device(ts_dev->input);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	iounmap(ts_dev->tsc_base);
-	release_mem_region(res->start, resource_size(res));
+	platform_set_drvdata(pdev, NULL);
+	kfree(ts_dev);
+	return 0;
+}
 
-	clk_disable(ts_dev->tsc_ick);
-	clk_put(ts_dev->tsc_ick);
+#ifdef CONFIG_PM
+static int titsc_suspend(struct device *dev)
+{
+	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
+	struct titsc *ts_dev = tscadc_dev->tsc;
+	unsigned int idle;
+
+	if (device_may_wakeup(tscadc_dev->dev)) {
+		idle = titsc_readl(ts_dev, REG_IRQENABLE);
+		titsc_writel(ts_dev, REG_IRQENABLE,
+				(idle | IRQENB_HW_PEN));
+		titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
+	}
+	return 0;
+}
 
-	kfree(ts_dev);
+static int titsc_resume(struct device *dev)
+{
+	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
+	struct titsc *ts_dev = tscadc_dev->tsc;
 
-	platform_set_drvdata(pdev, NULL);
+	if (device_may_wakeup(tscadc_dev->dev)) {
+		titsc_writel(ts_dev, REG_IRQWAKEUP,
+				0x00);
+		titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
+	}
+	titsc_step_config(ts_dev);
+	titsc_writel(ts_dev, REG_FIFO0THR,
+			ts_dev->steps_to_configure);
 	return 0;
 }
 
+static const struct dev_pm_ops titsc_pm_ops = {
+	.suspend = titsc_suspend,
+	.resume  = titsc_resume,
+};
+#define TITSC_PM_OPS (&titsc_pm_ops)
+#else
+#define TITSC_PM_OPS NULL
+#endif
+
 static struct platform_driver ti_tsc_driver = {
 	.probe	= titsc_probe,
 	.remove	= __devexit_p(titsc_remove),
 	.driver	= {
 		.name   = "tsc",
 		.owner	= THIS_MODULE,
+		.pm	= TITSC_PM_OPS,
 	},
 };
 module_platform_driver(ti_tsc_driver);

drivers/mfd/ti_am335x_tscadc.c

@@ -24,6 +24,7 @@
 #include <linux/pm_runtime.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
+#include <linux/input/ti_am335x_tsc.h>
 
 static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
 {
@@ -62,15 +63,19 @@ static	int __devinit ti_tscadc_probe(struct platform_device *pdev)
 	struct resource		*res;
 	struct clk		*clk;
 	struct mfd_tscadc_board	*pdata = pdev->dev.platform_data;
+	struct mfd_cell		*cell;
 	int			irq;
 	int			err, ctrl;
 	int			clk_value, clock_rate;
+	int			tsc_wires;
 
 	if (!pdata) {
 		dev_err(&pdev->dev, "Could not find platform data\n");
 		return -EINVAL;
 	}
 
+	tsc_wires = pdata->tsc_init->wires;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no memory resource defined.\n");
@@ -161,6 +166,12 @@ static	int __devinit ti_tscadc_probe(struct platform_device *pdev)
 	ctrl |= CNTRLREG_TSCSSENB;
 	tscadc_writel(tscadc, REG_CTRL, ctrl);
 
+	/* TSC Cell */
+	cell = &tscadc->cells[TSC_CELL];
+	cell->name = "tsc";
+	cell->platform_data = tscadc;
+	cell->pdata_size = sizeof(*tscadc);
+
 	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
 			TSCADC_CELLS, NULL, 0, NULL);
 	if (err < 0)

include/linux/mfd/ti_am335x_tscadc.h

@@ -47,6 +47,7 @@
 #define STEPENB_MASK		(0x1FFFF << 0)
 #define STEPENB(val)		((val) << 0)
 #define STPENB_STEPENB		STEPENB(0x1FFFF)
+#define STPENB_STEPENB_TC	STEPENB(0x1FFF)
 
 /* IRQ enable */
 #define IRQENB_HW_PEN		BIT(0)
@@ -120,7 +121,11 @@
 #define ADC_CLK			3000000
 #define	MAX_CLK_DIV		7
 
-#define TSCADC_CELLS		0
+#define TSCADC_CELLS		1
+
+enum tscadc_cells {
+	TSC_CELL,
+};
 
 struct mfd_tscadc_board {
 	struct tsc_data *tsc_init;
@@ -132,6 +137,9 @@ struct ti_tscadc_dev {
 	void __iomem *tscadc_base;
 	int irq;
 	struct mfd_cell cells[TSCADC_CELLS];
+
+	/* tsc device */
+	struct titsc *tsc;
 };
 
 #endif