From 2b99bafab19145a72e2c557326fc4662a864a162 Mon Sep 17 00:00:00 2001 From: "Patil, Rachna" Date: Tue, 16 Oct 2012 12:55:44 +0530 Subject: [PATCH] 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: Patil, Rachna Signed-off-by: Samuel Ortiz --- drivers/input/touchscreen/Kconfig | 2 +- drivers/input/touchscreen/ti_am335x_tsc.c | 318 +++++++--------------- drivers/mfd/ti_am335x_tscadc.c | 11 + include/linux/mfd/ti_am335x_tscadc.h | 10 +- 4 files changed, 118 insertions(+), 223 deletions(-) diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index d31dc5faeaa..0c45caddd41 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/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. diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c index 462950acb97..7a18a8a1522 100644 --- a/drivers/input/touchscreen/ti_am335x_tsc.c +++ b/drivers/input/touchscreen/ti_am335x_tsc.c @@ -27,106 +27,15 @@ #include #include -#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 #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 @@ err_free_mem: 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); diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index 14df67bc390..d812be4b61d 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -24,6 +24,7 @@ #include #include +#include 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) diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index b7232b15706..fc18b2ef753 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/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 -- 2.20.1