101636eb9SPatil, Rachna /* 201636eb9SPatil, Rachna * TI Touch Screen / ADC MFD driver 301636eb9SPatil, Rachna * 401636eb9SPatil, Rachna * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ 501636eb9SPatil, Rachna * 601636eb9SPatil, Rachna * This program is free software; you can redistribute it and/or 701636eb9SPatil, Rachna * modify it under the terms of the GNU General Public License as 801636eb9SPatil, Rachna * published by the Free Software Foundation version 2. 901636eb9SPatil, Rachna * 1001636eb9SPatil, Rachna * This program is distributed "as is" WITHOUT ANY WARRANTY of any 1101636eb9SPatil, Rachna * kind, whether express or implied; without even the implied warranty 1201636eb9SPatil, Rachna * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1301636eb9SPatil, Rachna * GNU General Public License for more details. 1401636eb9SPatil, Rachna */ 1501636eb9SPatil, Rachna 1601636eb9SPatil, Rachna #include <linux/module.h> 1701636eb9SPatil, Rachna #include <linux/init.h> 1801636eb9SPatil, Rachna #include <linux/slab.h> 1901636eb9SPatil, Rachna #include <linux/err.h> 2001636eb9SPatil, Rachna #include <linux/io.h> 2101636eb9SPatil, Rachna #include <linux/clk.h> 2201636eb9SPatil, Rachna #include <linux/regmap.h> 2301636eb9SPatil, Rachna #include <linux/mfd/core.h> 2401636eb9SPatil, Rachna #include <linux/pm_runtime.h> 2501636eb9SPatil, Rachna 2601636eb9SPatil, Rachna #include <linux/mfd/ti_am335x_tscadc.h> 272b99bafaSPatil, Rachna #include <linux/input/ti_am335x_tsc.h> 285e53a69bSPatil, Rachna #include <linux/platform_data/ti_am335x_adc.h> 2901636eb9SPatil, Rachna 3001636eb9SPatil, Rachna static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg) 3101636eb9SPatil, Rachna { 3201636eb9SPatil, Rachna unsigned int val; 3301636eb9SPatil, Rachna 3401636eb9SPatil, Rachna regmap_read(tsadc->regmap_tscadc, reg, &val); 3501636eb9SPatil, Rachna return val; 3601636eb9SPatil, Rachna } 3701636eb9SPatil, Rachna 3801636eb9SPatil, Rachna static void tscadc_writel(struct ti_tscadc_dev *tsadc, unsigned int reg, 3901636eb9SPatil, Rachna unsigned int val) 4001636eb9SPatil, Rachna { 4101636eb9SPatil, Rachna regmap_write(tsadc->regmap_tscadc, reg, val); 4201636eb9SPatil, Rachna } 4301636eb9SPatil, Rachna 4401636eb9SPatil, Rachna static const struct regmap_config tscadc_regmap_config = { 4501636eb9SPatil, Rachna .name = "ti_tscadc", 4601636eb9SPatil, Rachna .reg_bits = 32, 4701636eb9SPatil, Rachna .reg_stride = 4, 4801636eb9SPatil, Rachna .val_bits = 32, 4901636eb9SPatil, Rachna }; 5001636eb9SPatil, Rachna 5101636eb9SPatil, Rachna static void tscadc_idle_config(struct ti_tscadc_dev *config) 5201636eb9SPatil, Rachna { 5301636eb9SPatil, Rachna unsigned int idleconfig; 5401636eb9SPatil, Rachna 5501636eb9SPatil, Rachna idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM | 5601636eb9SPatil, Rachna STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN; 5701636eb9SPatil, Rachna 5801636eb9SPatil, Rachna tscadc_writel(config, REG_IDLECONFIG, idleconfig); 5901636eb9SPatil, Rachna } 6001636eb9SPatil, Rachna 61612b95cdSGreg Kroah-Hartman static int ti_tscadc_probe(struct platform_device *pdev) 6201636eb9SPatil, Rachna { 6301636eb9SPatil, Rachna struct ti_tscadc_dev *tscadc; 6401636eb9SPatil, Rachna struct resource *res; 6501636eb9SPatil, Rachna struct clk *clk; 6601636eb9SPatil, Rachna struct mfd_tscadc_board *pdata = pdev->dev.platform_data; 672b99bafaSPatil, Rachna struct mfd_cell *cell; 6801636eb9SPatil, Rachna int err, ctrl; 6901636eb9SPatil, Rachna int clk_value, clock_rate; 705e53a69bSPatil, Rachna int tsc_wires, adc_channels = 0, total_channels; 7101636eb9SPatil, Rachna 7201636eb9SPatil, Rachna if (!pdata) { 7301636eb9SPatil, Rachna dev_err(&pdev->dev, "Could not find platform data\n"); 7401636eb9SPatil, Rachna return -EINVAL; 7501636eb9SPatil, Rachna } 7601636eb9SPatil, Rachna 775e53a69bSPatil, Rachna if (pdata->adc_init) 785e53a69bSPatil, Rachna adc_channels = pdata->adc_init->adc_channels; 795e53a69bSPatil, Rachna 802b99bafaSPatil, Rachna tsc_wires = pdata->tsc_init->wires; 815e53a69bSPatil, Rachna total_channels = tsc_wires + adc_channels; 825e53a69bSPatil, Rachna 835e53a69bSPatil, Rachna if (total_channels > 8) { 845e53a69bSPatil, Rachna dev_err(&pdev->dev, "Number of i/p channels more than 8\n"); 855e53a69bSPatil, Rachna return -EINVAL; 865e53a69bSPatil, Rachna } 872b99bafaSPatil, Rachna 8801636eb9SPatil, Rachna res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 8901636eb9SPatil, Rachna if (!res) { 9001636eb9SPatil, Rachna dev_err(&pdev->dev, "no memory resource defined.\n"); 9101636eb9SPatil, Rachna return -EINVAL; 9201636eb9SPatil, Rachna } 9301636eb9SPatil, Rachna 9401636eb9SPatil, Rachna /* Allocate memory for device */ 9501636eb9SPatil, Rachna tscadc = devm_kzalloc(&pdev->dev, 9601636eb9SPatil, Rachna sizeof(struct ti_tscadc_dev), GFP_KERNEL); 9701636eb9SPatil, Rachna if (!tscadc) { 9801636eb9SPatil, Rachna dev_err(&pdev->dev, "failed to allocate memory.\n"); 9901636eb9SPatil, Rachna return -ENOMEM; 10001636eb9SPatil, Rachna } 10101636eb9SPatil, Rachna tscadc->dev = &pdev->dev; 1023c39c9c6SPatil, Rachna 1033c39c9c6SPatil, Rachna err = platform_get_irq(pdev, 0); 1043c39c9c6SPatil, Rachna if (err < 0) { 1053c39c9c6SPatil, Rachna dev_err(&pdev->dev, "no irq ID is specified.\n"); 1063c39c9c6SPatil, Rachna goto ret; 1073c39c9c6SPatil, Rachna } else 1083c39c9c6SPatil, Rachna tscadc->irq = err; 10901636eb9SPatil, Rachna 11001636eb9SPatil, Rachna res = devm_request_mem_region(&pdev->dev, 11101636eb9SPatil, Rachna res->start, resource_size(res), pdev->name); 11201636eb9SPatil, Rachna if (!res) { 11301636eb9SPatil, Rachna dev_err(&pdev->dev, "failed to reserve registers.\n"); 1143c39c9c6SPatil, Rachna return -EBUSY; 11501636eb9SPatil, Rachna } 11601636eb9SPatil, Rachna 11701636eb9SPatil, Rachna tscadc->tscadc_base = devm_ioremap(&pdev->dev, 11801636eb9SPatil, Rachna res->start, resource_size(res)); 11901636eb9SPatil, Rachna if (!tscadc->tscadc_base) { 12001636eb9SPatil, Rachna dev_err(&pdev->dev, "failed to map registers.\n"); 1213c39c9c6SPatil, Rachna return -ENOMEM; 12201636eb9SPatil, Rachna } 12301636eb9SPatil, Rachna 12401636eb9SPatil, Rachna tscadc->regmap_tscadc = devm_regmap_init_mmio(&pdev->dev, 12501636eb9SPatil, Rachna tscadc->tscadc_base, &tscadc_regmap_config); 12601636eb9SPatil, Rachna if (IS_ERR(tscadc->regmap_tscadc)) { 12701636eb9SPatil, Rachna dev_err(&pdev->dev, "regmap init failed\n"); 12801636eb9SPatil, Rachna err = PTR_ERR(tscadc->regmap_tscadc); 1293c39c9c6SPatil, Rachna goto ret; 13001636eb9SPatil, Rachna } 13101636eb9SPatil, Rachna 13201636eb9SPatil, Rachna pm_runtime_enable(&pdev->dev); 13301636eb9SPatil, Rachna pm_runtime_get_sync(&pdev->dev); 13401636eb9SPatil, Rachna 13501636eb9SPatil, Rachna /* 13601636eb9SPatil, Rachna * The TSC_ADC_Subsystem has 2 clock domains 13701636eb9SPatil, Rachna * OCP_CLK and ADC_CLK. 13801636eb9SPatil, Rachna * The ADC clock is expected to run at target of 3MHz, 13901636eb9SPatil, Rachna * and expected to capture 12-bit data at a rate of 200 KSPS. 14001636eb9SPatil, Rachna * The TSC_ADC_SS controller design assumes the OCP clock is 14101636eb9SPatil, Rachna * at least 6x faster than the ADC clock. 14201636eb9SPatil, Rachna */ 14301636eb9SPatil, Rachna clk = clk_get(&pdev->dev, "adc_tsc_fck"); 14401636eb9SPatil, Rachna if (IS_ERR(clk)) { 14501636eb9SPatil, Rachna dev_err(&pdev->dev, "failed to get TSC fck\n"); 14601636eb9SPatil, Rachna err = PTR_ERR(clk); 14701636eb9SPatil, Rachna goto err_disable_clk; 14801636eb9SPatil, Rachna } 14901636eb9SPatil, Rachna clock_rate = clk_get_rate(clk); 15001636eb9SPatil, Rachna clk_put(clk); 15101636eb9SPatil, Rachna clk_value = clock_rate / ADC_CLK; 15201636eb9SPatil, Rachna if (clk_value < MAX_CLK_DIV) { 15301636eb9SPatil, Rachna dev_err(&pdev->dev, "clock input less than min clock requirement\n"); 15401636eb9SPatil, Rachna err = -EINVAL; 15501636eb9SPatil, Rachna goto err_disable_clk; 15601636eb9SPatil, Rachna } 15701636eb9SPatil, Rachna /* TSCADC_CLKDIV needs to be configured to the value minus 1 */ 15801636eb9SPatil, Rachna clk_value = clk_value - 1; 15901636eb9SPatil, Rachna tscadc_writel(tscadc, REG_CLKDIV, clk_value); 16001636eb9SPatil, Rachna 16101636eb9SPatil, Rachna /* Set the control register bits */ 16201636eb9SPatil, Rachna ctrl = CNTRLREG_STEPCONFIGWRT | 16301636eb9SPatil, Rachna CNTRLREG_TSCENB | 16401636eb9SPatil, Rachna CNTRLREG_STEPID | 16501636eb9SPatil, Rachna CNTRLREG_4WIRE; 16601636eb9SPatil, Rachna tscadc_writel(tscadc, REG_CTRL, ctrl); 16701636eb9SPatil, Rachna 16801636eb9SPatil, Rachna /* Set register bits for Idle Config Mode */ 16901636eb9SPatil, Rachna tscadc_idle_config(tscadc); 17001636eb9SPatil, Rachna 17101636eb9SPatil, Rachna /* Enable the TSC module enable bit */ 17201636eb9SPatil, Rachna ctrl = tscadc_readl(tscadc, REG_CTRL); 17301636eb9SPatil, Rachna ctrl |= CNTRLREG_TSCSSENB; 17401636eb9SPatil, Rachna tscadc_writel(tscadc, REG_CTRL, ctrl); 17501636eb9SPatil, Rachna 1762b99bafaSPatil, Rachna /* TSC Cell */ 1772b99bafaSPatil, Rachna cell = &tscadc->cells[TSC_CELL]; 1782b99bafaSPatil, Rachna cell->name = "tsc"; 179a9bce1b0SSebastian Andrzej Siewior cell->platform_data = &tscadc; 180a9bce1b0SSebastian Andrzej Siewior cell->pdata_size = sizeof(tscadc); 1812b99bafaSPatil, Rachna 1825e53a69bSPatil, Rachna /* ADC Cell */ 1835e53a69bSPatil, Rachna cell = &tscadc->cells[ADC_CELL]; 1845e53a69bSPatil, Rachna cell->name = "tiadc"; 185a9bce1b0SSebastian Andrzej Siewior cell->platform_data = &tscadc; 186a9bce1b0SSebastian Andrzej Siewior cell->pdata_size = sizeof(tscadc); 1875e53a69bSPatil, Rachna 18801636eb9SPatil, Rachna err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells, 18901636eb9SPatil, Rachna TSCADC_CELLS, NULL, 0, NULL); 19001636eb9SPatil, Rachna if (err < 0) 19101636eb9SPatil, Rachna goto err_disable_clk; 19201636eb9SPatil, Rachna 19301636eb9SPatil, Rachna device_init_wakeup(&pdev->dev, true); 19401636eb9SPatil, Rachna platform_set_drvdata(pdev, tscadc); 19501636eb9SPatil, Rachna 19601636eb9SPatil, Rachna return 0; 19701636eb9SPatil, Rachna 19801636eb9SPatil, Rachna err_disable_clk: 19901636eb9SPatil, Rachna pm_runtime_put_sync(&pdev->dev); 20001636eb9SPatil, Rachna pm_runtime_disable(&pdev->dev); 2013c39c9c6SPatil, Rachna ret: 20201636eb9SPatil, Rachna return err; 20301636eb9SPatil, Rachna } 20401636eb9SPatil, Rachna 205612b95cdSGreg Kroah-Hartman static int ti_tscadc_remove(struct platform_device *pdev) 20601636eb9SPatil, Rachna { 20701636eb9SPatil, Rachna struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev); 20801636eb9SPatil, Rachna 20901636eb9SPatil, Rachna tscadc_writel(tscadc, REG_SE, 0x00); 21001636eb9SPatil, Rachna 21101636eb9SPatil, Rachna pm_runtime_put_sync(&pdev->dev); 21201636eb9SPatil, Rachna pm_runtime_disable(&pdev->dev); 21301636eb9SPatil, Rachna 21401636eb9SPatil, Rachna mfd_remove_devices(tscadc->dev); 21501636eb9SPatil, Rachna 21601636eb9SPatil, Rachna return 0; 21701636eb9SPatil, Rachna } 21801636eb9SPatil, Rachna 21901636eb9SPatil, Rachna #ifdef CONFIG_PM 22001636eb9SPatil, Rachna static int tscadc_suspend(struct device *dev) 22101636eb9SPatil, Rachna { 22201636eb9SPatil, Rachna struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev); 22301636eb9SPatil, Rachna 22401636eb9SPatil, Rachna tscadc_writel(tscadc_dev, REG_SE, 0x00); 22501636eb9SPatil, Rachna pm_runtime_put_sync(dev); 22601636eb9SPatil, Rachna 22701636eb9SPatil, Rachna return 0; 22801636eb9SPatil, Rachna } 22901636eb9SPatil, Rachna 23001636eb9SPatil, Rachna static int tscadc_resume(struct device *dev) 23101636eb9SPatil, Rachna { 23201636eb9SPatil, Rachna struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev); 23301636eb9SPatil, Rachna unsigned int restore, ctrl; 23401636eb9SPatil, Rachna 23501636eb9SPatil, Rachna pm_runtime_get_sync(dev); 23601636eb9SPatil, Rachna 23701636eb9SPatil, Rachna /* context restore */ 23801636eb9SPatil, Rachna ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_TSCENB | 23901636eb9SPatil, Rachna CNTRLREG_STEPID | CNTRLREG_4WIRE; 24001636eb9SPatil, Rachna tscadc_writel(tscadc_dev, REG_CTRL, ctrl); 24101636eb9SPatil, Rachna tscadc_idle_config(tscadc_dev); 24201636eb9SPatil, Rachna tscadc_writel(tscadc_dev, REG_SE, STPENB_STEPENB); 24301636eb9SPatil, Rachna restore = tscadc_readl(tscadc_dev, REG_CTRL); 24401636eb9SPatil, Rachna tscadc_writel(tscadc_dev, REG_CTRL, 24501636eb9SPatil, Rachna (restore | CNTRLREG_TSCSSENB)); 24601636eb9SPatil, Rachna 24701636eb9SPatil, Rachna return 0; 24801636eb9SPatil, Rachna } 24901636eb9SPatil, Rachna 25001636eb9SPatil, Rachna static const struct dev_pm_ops tscadc_pm_ops = { 25101636eb9SPatil, Rachna .suspend = tscadc_suspend, 25201636eb9SPatil, Rachna .resume = tscadc_resume, 25301636eb9SPatil, Rachna }; 25401636eb9SPatil, Rachna #define TSCADC_PM_OPS (&tscadc_pm_ops) 25501636eb9SPatil, Rachna #else 25601636eb9SPatil, Rachna #define TSCADC_PM_OPS NULL 25701636eb9SPatil, Rachna #endif 25801636eb9SPatil, Rachna 25901636eb9SPatil, Rachna static struct platform_driver ti_tscadc_driver = { 26001636eb9SPatil, Rachna .driver = { 26101636eb9SPatil, Rachna .name = "ti_tscadc", 26201636eb9SPatil, Rachna .owner = THIS_MODULE, 26301636eb9SPatil, Rachna .pm = TSCADC_PM_OPS, 26401636eb9SPatil, Rachna }, 26501636eb9SPatil, Rachna .probe = ti_tscadc_probe, 266612b95cdSGreg Kroah-Hartman .remove = ti_tscadc_remove, 26701636eb9SPatil, Rachna 26801636eb9SPatil, Rachna }; 26901636eb9SPatil, Rachna 27001636eb9SPatil, Rachna module_platform_driver(ti_tscadc_driver); 27101636eb9SPatil, Rachna 27201636eb9SPatil, Rachna MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); 27301636eb9SPatil, Rachna MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); 27401636eb9SPatil, Rachna MODULE_LICENSE("GPL"); 275