/* * Freescale MXS Low Resolution Analog-to-Digital Converter driver * * Copyright (c) 2012 DENX Software Engineering, GmbH. * Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com> * * Authors: * Marek Vasut <marex@denx.de> * Ksenija Stanojevic <ksenija.stanojevic@gmail.com> * * 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, or * (at your option) any later version. * * 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. */ #include <linux/clk.h> #include <linux/device.h> #include <linux/mfd/core.h> #include <linux/mfd/mxs-lradc.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/slab.h> #define ADC_CELL 0 #define TSC_CELL 1 #define RES_MEM 0 enum mx23_lradc_irqs { MX23_LRADC_TS_IRQ = 0, MX23_LRADC_CH0_IRQ, MX23_LRADC_CH1_IRQ, MX23_LRADC_CH2_IRQ, MX23_LRADC_CH3_IRQ, MX23_LRADC_CH4_IRQ, MX23_LRADC_CH5_IRQ, MX23_LRADC_CH6_IRQ, MX23_LRADC_CH7_IRQ, }; enum mx28_lradc_irqs { MX28_LRADC_TS_IRQ = 0, MX28_LRADC_TRESH0_IRQ, MX28_LRADC_TRESH1_IRQ, MX28_LRADC_CH0_IRQ, MX28_LRADC_CH1_IRQ, MX28_LRADC_CH2_IRQ, MX28_LRADC_CH3_IRQ, MX28_LRADC_CH4_IRQ, MX28_LRADC_CH5_IRQ, MX28_LRADC_CH6_IRQ, MX28_LRADC_CH7_IRQ, MX28_LRADC_BUTTON0_IRQ, MX28_LRADC_BUTTON1_IRQ, }; static struct resource mx23_adc_resources[] = { DEFINE_RES_MEM(0x0, 0x0), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"), }; static struct resource mx23_touchscreen_resources[] = { DEFINE_RES_MEM(0x0, 0x0), DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"), DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"), }; static struct resource mx28_adc_resources[] = { DEFINE_RES_MEM(0x0, 0x0), DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"), }; static struct resource mx28_touchscreen_resources[] = { DEFINE_RES_MEM(0x0, 0x0), DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"), DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"), }; static struct mfd_cell mx23_cells[] = { { .name = "mxs-lradc-adc", .resources = mx23_adc_resources, .num_resources = ARRAY_SIZE(mx23_adc_resources), }, { .name = "mxs-lradc-ts", .resources = mx23_touchscreen_resources, .num_resources = ARRAY_SIZE(mx23_touchscreen_resources), }, }; static struct mfd_cell mx28_cells[] = { { .name = "mxs-lradc-adc", .resources = mx28_adc_resources, .num_resources = ARRAY_SIZE(mx28_adc_resources), }, { .name = "mxs-lradc-ts", .resources = mx28_touchscreen_resources, .num_resources = ARRAY_SIZE(mx28_touchscreen_resources), } }; static const struct of_device_id mxs_lradc_dt_ids[] = { { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, }, { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); static int mxs_lradc_probe(struct platform_device *pdev) { const struct of_device_id *of_id; struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; struct mxs_lradc *lradc; struct mfd_cell *cells = NULL; struct resource *res; int ret = 0; u32 ts_wires = 0; lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL); if (!lradc) return -ENOMEM; of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev); if (!of_id) return -EINVAL; lradc->soc = (enum mxs_lradc_id)of_id->data; lradc->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(lradc->clk)) { dev_err(dev, "Failed to get the delay unit clock\n"); return PTR_ERR(lradc->clk); } ret = clk_prepare_enable(lradc->clk); if (ret) { dev_err(dev, "Failed to enable the delay unit clock\n"); return ret; } ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", &ts_wires); if (!ret) { lradc->buffer_vchans = BUFFER_VCHANS_LIMITED; switch (ts_wires) { case 4: lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE; break; case 5: if (lradc->soc == IMX28_LRADC) { lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_5WIRE; break; } /* fall through to an error message for i.MX23 */ default: dev_err(&pdev->dev, "Unsupported number of touchscreen wires (%d)\n" , ts_wires); ret = -EINVAL; goto err_clk; } } else { lradc->buffer_vchans = BUFFER_VCHANS_ALL; } platform_set_drvdata(pdev, lradc); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { ret = -ENOMEM; goto err_clk; } switch (lradc->soc) { case IMX23_LRADC: mx23_adc_resources[RES_MEM] = *res; mx23_touchscreen_resources[RES_MEM] = *res; cells = mx23_cells; break; case IMX28_LRADC: mx28_adc_resources[RES_MEM] = *res; mx28_touchscreen_resources[RES_MEM] = *res; cells = mx28_cells; break; default: dev_err(dev, "Unsupported SoC\n"); ret = -ENODEV; goto err_clk; } ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, &cells[ADC_CELL], 1, NULL, 0, NULL); if (ret) { dev_err(&pdev->dev, "Failed to add the ADC subdevice\n"); goto err_clk; } if (!lradc->touchscreen_wire) return 0; ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, &cells[TSC_CELL], 1, NULL, 0, NULL); if (ret) { dev_err(&pdev->dev, "Failed to add the touchscreen subdevice\n"); goto err_clk; } return 0; err_clk: clk_disable_unprepare(lradc->clk); return ret; } static int mxs_lradc_remove(struct platform_device *pdev) { struct mxs_lradc *lradc = platform_get_drvdata(pdev); clk_disable_unprepare(lradc->clk); return 0; } static struct platform_driver mxs_lradc_driver = { .driver = { .name = "mxs-lradc", .of_match_table = mxs_lradc_dt_ids, }, .probe = mxs_lradc_probe, .remove = mxs_lradc_remove, }; module_platform_driver(mxs_lradc_driver); MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>"); MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mxs-lradc");