// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the ADC present in the Atmel AT91 evaluation boards. * * Copyright 2011 Free Electrons */ #include <linux/bitmap.h> #include <linux/bitops.h> #include <linux/cleanup.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/io.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/wait.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/pinctrl/consumer.h> /* Registers */ #define AT91_ADC_CR … #define AT91_ADC_SWRST … #define AT91_ADC_START … #define AT91_ADC_MR … #define AT91_ADC_TSAMOD … #define AT91_ADC_TSAMOD_ADC_ONLY_MODE … #define AT91_ADC_TSAMOD_TS_ONLY_MODE … #define AT91_ADC_TRGEN … #define AT91_ADC_TRGSEL … #define AT91_ADC_TRGSEL_TC0 … #define AT91_ADC_TRGSEL_TC1 … #define AT91_ADC_TRGSEL_TC2 … #define AT91_ADC_TRGSEL_EXTERNAL … #define AT91_ADC_LOWRES … #define AT91_ADC_SLEEP … #define AT91_ADC_PENDET … #define AT91_ADC_PRESCAL_9260 … #define AT91_ADC_PRESCAL_9G45 … #define AT91_ADC_PRESCAL_(x) … #define AT91_ADC_STARTUP_9260 … #define AT91_ADC_STARTUP_9G45 … #define AT91_ADC_STARTUP_9X5 … #define AT91_ADC_STARTUP_(x) … #define AT91_ADC_SHTIM … #define AT91_ADC_SHTIM_(x) … #define AT91_ADC_PENDBC … #define AT91_ADC_PENDBC_(x) … #define AT91_ADC_TSR … #define AT91_ADC_TSR_SHTIM … #define AT91_ADC_TSR_SHTIM_(x) … #define AT91_ADC_CHER … #define AT91_ADC_CHDR … #define AT91_ADC_CHSR … #define AT91_ADC_CH(n) … #define AT91_ADC_SR … #define AT91_ADC_EOC(n) … #define AT91_ADC_OVRE(n) … #define AT91_ADC_DRDY … #define AT91_ADC_GOVRE … #define AT91_ADC_ENDRX … #define AT91_ADC_RXFUFF … #define AT91_ADC_SR_9X5 … #define AT91_ADC_SR_DRDY_9X5 … #define AT91_ADC_LCDR … #define AT91_ADC_LDATA … #define AT91_ADC_IER … #define AT91_ADC_IDR … #define AT91_ADC_IMR … #define AT91RL_ADC_IER_PEN … #define AT91RL_ADC_IER_NOPEN … #define AT91_ADC_IER_PEN … #define AT91_ADC_IER_NOPEN … #define AT91_ADC_IER_XRDY … #define AT91_ADC_IER_YRDY … #define AT91_ADC_IER_PRDY … #define AT91_ADC_ISR_PENS … #define AT91_ADC_CHR(n) … #define AT91_ADC_DATA … #define AT91_ADC_CDR0_9X5 … #define AT91_ADC_ACR … #define AT91_ADC_ACR_PENDETSENS … #define AT91_ADC_TSMR … #define AT91_ADC_TSMR_TSMODE … #define AT91_ADC_TSMR_TSMODE_NONE … #define AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS … #define AT91_ADC_TSMR_TSMODE_4WIRE_PRESS … #define AT91_ADC_TSMR_TSMODE_5WIRE … #define AT91_ADC_TSMR_TSAV … #define AT91_ADC_TSMR_TSAV_(x) … #define AT91_ADC_TSMR_SCTIM … #define AT91_ADC_TSMR_SCTIM_(x) … #define AT91_ADC_TSMR_PENDBC … #define AT91_ADC_TSMR_PENDBC_(x) … #define AT91_ADC_TSMR_NOTSDMA … #define AT91_ADC_TSMR_PENDET_DIS … #define AT91_ADC_TSMR_PENDET_ENA … #define AT91_ADC_TSXPOSR … #define AT91_ADC_TSYPOSR … #define AT91_ADC_TSPRESSR … #define AT91_ADC_TRGR_9260 … #define AT91_ADC_TRGR_9G45 … #define AT91_ADC_TRGR_9X5 … /* Trigger Register bit field */ #define AT91_ADC_TRGR_TRGPER … #define AT91_ADC_TRGR_TRGPER_(x) … #define AT91_ADC_TRGR_TRGMOD … #define AT91_ADC_TRGR_NONE … #define AT91_ADC_TRGR_MOD_PERIOD_TRIG … #define AT91_ADC_CHAN(st, ch) … #define at91_adc_readl(st, reg) … #define at91_adc_writel(st, reg, val) … #define DRIVER_NAME … #define MAX_POS_BITS … #define TOUCH_SAMPLE_PERIOD_US … #define TOUCH_PEN_DETECT_DEBOUNCE_US … #define MAX_RLPOS_BITS … #define TOUCH_SAMPLE_PERIOD_US_RL … #define TOUCH_SHTIM … #define TOUCH_SCTIM_US … enum atmel_adc_ts_type { … }; /** * struct at91_adc_trigger - description of triggers * @name: name of the trigger advertised to the user * @value: value to set in the ADC's trigger setup register * to enable the trigger * @is_external: Does the trigger rely on an external pin? */ struct at91_adc_trigger { … }; /** * struct at91_adc_reg_desc - Various informations relative to registers * @channel_base: Base offset for the channel data registers * @drdy_mask: Mask of the DRDY field in the relevant registers * (Interruptions registers mostly) * @status_register: Offset of the Interrupt Status Register * @trigger_register: Offset of the Trigger setup register * @mr_prescal_mask: Mask of the PRESCAL field in the adc MR register * @mr_startup_mask: Mask of the STARTUP field in the adc MR register */ struct at91_adc_reg_desc { … }; struct at91_adc_caps { … }; struct at91_adc_state { … }; static irqreturn_t at91_adc_trigger_handler(int irq, void *p) { … } /* Handler for classic adc channel eoc trigger */ static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) { … } static int at91_ts_sample(struct iio_dev *idev) { … } static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) { … } static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) { … } static int at91_adc_channel_init(struct iio_dev *idev) { … } static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev, const struct at91_adc_trigger *triggers, const char *trigger_name) { … } static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) { … } static const struct iio_trigger_ops at91_adc_trigger_ops = …; static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev, const struct at91_adc_trigger *trigger) { … } static int at91_adc_trigger_init(struct iio_dev *idev) { … } static void at91_adc_trigger_remove(struct iio_dev *idev) { … } static int at91_adc_buffer_init(struct iio_dev *idev) { … } static void at91_adc_buffer_remove(struct iio_dev *idev) { … } static int at91_adc_read_raw(struct iio_dev *idev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz) { … } static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz) { … } static int at91_adc_probe_dt_ts(struct device_node *node, struct at91_adc_state *st, struct device *dev) { … } static const struct iio_info at91_adc_info = …; /* Touchscreen related functions */ static int atmel_ts_open(struct input_dev *dev) { … } static void atmel_ts_close(struct input_dev *dev) { … } static int at91_ts_hw_init(struct iio_dev *idev, u32 adc_clk_khz) { … } static int at91_ts_register(struct iio_dev *idev, struct platform_device *pdev) { … } static void at91_ts_unregister(struct at91_adc_state *st) { … } static int at91_adc_probe(struct platform_device *pdev) { … } static void at91_adc_remove(struct platform_device *pdev) { … } static int at91_adc_suspend(struct device *dev) { … } static int at91_adc_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume); static const struct at91_adc_trigger at91sam9260_triggers[] = …; static struct at91_adc_caps at91sam9260_caps = …; static const struct at91_adc_trigger at91sam9x5_triggers[] = …; static struct at91_adc_caps at91sam9rl_caps = …; static struct at91_adc_caps at91sam9g45_caps = …; static struct at91_adc_caps at91sam9x5_caps = …; static struct at91_adc_caps sama5d3_caps = …; static const struct of_device_id at91_adc_dt_ids[] = …; MODULE_DEVICE_TABLE(of, at91_adc_dt_ids); static struct platform_driver at91_adc_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …;
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