diff options
Diffstat (limited to 'drivers/iio/adc/at91_adc.c')
| -rw-r--r-- | drivers/iio/adc/at91_adc.c | 1488 |
1 files changed, 1488 insertions, 0 deletions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c new file mode 100644 index 000000000..596841a3c --- /dev/null +++ b/drivers/iio/adc/at91_adc.c @@ -0,0 +1,1488 @@ +/* + * Driver for the ADC present in the Atmel AT91 evaluation boards. + * + * Copyright 2011 Free Electrons + * + * Licensed under the GPLv2 or later. + */ + +#include <linux/bitmap.h> +#include <linux/bitops.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/of_device.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/wait.h> + +#include <linux/platform_data/at91_adc.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 0x00 /* Control Register */ +#define AT91_ADC_SWRST (1 << 0) /* Software Reset */ +#define AT91_ADC_START (1 << 1) /* Start Conversion */ + +#define AT91_ADC_MR 0x04 /* Mode Register */ +#define AT91_ADC_TSAMOD (3 << 0) /* ADC mode */ +#define AT91_ADC_TSAMOD_ADC_ONLY_MODE (0 << 0) /* ADC Mode */ +#define AT91_ADC_TSAMOD_TS_ONLY_MODE (1 << 0) /* Touch Screen Only Mode */ +#define AT91_ADC_TRGEN (1 << 0) /* Trigger Enable */ +#define AT91_ADC_TRGSEL (7 << 1) /* Trigger Selection */ +#define AT91_ADC_TRGSEL_TC0 (0 << 1) +#define AT91_ADC_TRGSEL_TC1 (1 << 1) +#define AT91_ADC_TRGSEL_TC2 (2 << 1) +#define AT91_ADC_TRGSEL_EXTERNAL (6 << 1) +#define AT91_ADC_LOWRES (1 << 4) /* Low Resolution */ +#define AT91_ADC_SLEEP (1 << 5) /* Sleep Mode */ +#define AT91_ADC_PENDET (1 << 6) /* Pen contact detection enable */ +#define AT91_ADC_PRESCAL_9260 (0x3f << 8) /* Prescalar Rate Selection */ +#define AT91_ADC_PRESCAL_9G45 (0xff << 8) +#define AT91_ADC_PRESCAL_(x) ((x) << 8) +#define AT91_ADC_STARTUP_9260 (0x1f << 16) /* Startup Up Time */ +#define AT91_ADC_STARTUP_9G45 (0x7f << 16) +#define AT91_ADC_STARTUP_9X5 (0xf << 16) +#define AT91_ADC_STARTUP_(x) ((x) << 16) +#define AT91_ADC_SHTIM (0xf << 24) /* Sample & Hold Time */ +#define AT91_ADC_SHTIM_(x) ((x) << 24) +#define AT91_ADC_PENDBC (0x0f << 28) /* Pen Debounce time */ +#define AT91_ADC_PENDBC_(x) ((x) << 28) + +#define AT91_ADC_TSR 0x0C +#define AT91_ADC_TSR_SHTIM (0xf << 24) /* Sample & Hold Time */ +#define AT91_ADC_TSR_SHTIM_(x) ((x) << 24) + +#define AT91_ADC_CHER 0x10 /* Channel Enable Register */ +#define AT91_ADC_CHDR 0x14 /* Channel Disable Register */ +#define AT91_ADC_CHSR 0x18 /* Channel Status Register */ +#define AT91_ADC_CH(n) (1 << (n)) /* Channel Number */ + +#define AT91_ADC_SR 0x1C /* Status Register */ +#define AT91_ADC_EOC(n) (1 << (n)) /* End of Conversion on Channel N */ +#define AT91_ADC_OVRE(n) (1 << ((n) + 8))/* Overrun Error on Channel N */ +#define AT91_ADC_DRDY (1 << 16) /* Data Ready */ +#define AT91_ADC_GOVRE (1 << 17) /* General Overrun Error */ +#define AT91_ADC_ENDRX (1 << 18) /* End of RX Buffer */ +#define AT91_ADC_RXFUFF (1 << 19) /* RX Buffer Full */ + +#define AT91_ADC_SR_9X5 0x30 /* Status Register for 9x5 */ +#define AT91_ADC_SR_DRDY_9X5 (1 << 24) /* Data Ready */ + +#define AT91_ADC_LCDR 0x20 /* Last Converted Data Register */ +#define AT91_ADC_LDATA (0x3ff) + +#define AT91_ADC_IER 0x24 /* Interrupt Enable Register */ +#define AT91_ADC_IDR 0x28 /* Interrupt Disable Register */ +#define AT91_ADC_IMR 0x2C /* Interrupt Mask Register */ +#define AT91RL_ADC_IER_PEN (1 << 20) +#define AT91RL_ADC_IER_NOPEN (1 << 21) +#define AT91_ADC_IER_PEN (1 << 29) +#define AT91_ADC_IER_NOPEN (1 << 30) +#define AT91_ADC_IER_XRDY (1 << 20) +#define AT91_ADC_IER_YRDY (1 << 21) +#define AT91_ADC_IER_PRDY (1 << 22) +#define AT91_ADC_ISR_PENS (1 << 31) + +#define AT91_ADC_CHR(n) (0x30 + ((n) * 4)) /* Channel Data Register N */ +#define AT91_ADC_DATA (0x3ff) + +#define AT91_ADC_CDR0_9X5 (0x50) /* Channel Data Register 0 for 9X5 */ + +#define AT91_ADC_ACR 0x94 /* Analog Control Register */ +#define AT91_ADC_ACR_PENDETSENS (0x3 << 0) /* pull-up resistor */ + +#define AT91_ADC_TSMR 0xB0 +#define AT91_ADC_TSMR_TSMODE (3 << 0) /* Touch Screen Mode */ +#define AT91_ADC_TSMR_TSMODE_NONE (0 << 0) +#define AT91_ADC_TSMR_TSMODE_4WIRE_NO_PRESS (1 << 0) +#define AT91_ADC_TSMR_TSMODE_4WIRE_PRESS (2 << 0) +#define AT91_ADC_TSMR_TSMODE_5WIRE (3 << 0) +#define AT91_ADC_TSMR_TSAV (3 << 4) /* Averages samples */ +#define AT91_ADC_TSMR_TSAV_(x) ((x) << 4) +#define AT91_ADC_TSMR_SCTIM (0x0f << 16) /* Switch closure time */ +#define AT91_ADC_TSMR_SCTIM_(x) ((x) << 16) +#define AT91_ADC_TSMR_PENDBC (0x0f << 28) /* Pen Debounce time */ +#define AT91_ADC_TSMR_PENDBC_(x) ((x) << 28) +#define AT91_ADC_TSMR_NOTSDMA (1 << 22) /* No Touchscreen DMA */ +#define AT91_ADC_TSMR_PENDET_DIS (0 << 24) /* Pen contact detection disable */ +#define AT91_ADC_TSMR_PENDET_ENA (1 << 24) /* Pen contact detection enable */ + +#define AT91_ADC_TSXPOSR 0xB4 +#define AT91_ADC_TSYPOSR 0xB8 +#define AT91_ADC_TSPRESSR 0xBC + +#define AT91_ADC_TRGR_9260 AT91_ADC_MR +#define AT91_ADC_TRGR_9G45 0x08 +#define AT91_ADC_TRGR_9X5 0xC0 + +/* Trigger Register bit field */ +#define AT91_ADC_TRGR_TRGPER (0xffff << 16) +#define AT91_ADC_TRGR_TRGPER_(x) ((x) << 16) +#define AT91_ADC_TRGR_TRGMOD (0x7 << 0) +#define AT91_ADC_TRGR_NONE (0 << 0) +#define AT91_ADC_TRGR_MOD_PERIOD_TRIG (5 << 0) + +#define AT91_ADC_CHAN(st, ch) \ + (st->registers->channel_base + (ch * 4)) +#define at91_adc_readl(st, reg) \ + (readl_relaxed(st->reg_base + reg)) +#define at91_adc_writel(st, reg, val) \ + (writel_relaxed(val, st->reg_base + reg)) + +#define DRIVER_NAME "at91_adc" +#define MAX_POS_BITS 12 + +#define TOUCH_SAMPLE_PERIOD_US 2000 /* 2ms */ +#define TOUCH_PEN_DETECT_DEBOUNCE_US 200 + +#define MAX_RLPOS_BITS 10 +#define TOUCH_SAMPLE_PERIOD_US_RL 10000 /* 10ms, the SoC can't keep up with 2ms */ +#define TOUCH_SHTIM 0xa +#define TOUCH_SCTIM_US 10 /* 10us for the Touchscreen Switches Closure Time */ + +/** + * 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 { + u8 channel_base; + u32 drdy_mask; + u8 status_register; + u8 trigger_register; + u32 mr_prescal_mask; + u32 mr_startup_mask; +}; + +struct at91_adc_caps { + bool has_ts; /* Support touch screen */ + bool has_tsmr; /* only at91sam9x5, sama5d3 have TSMR reg */ + /* + * Numbers of sampling data will be averaged. Can be 0~3. + * Hardware can average (2 ^ ts_filter_average) sample data. + */ + u8 ts_filter_average; + /* Pen Detection input pull-up resistor, can be 0~3 */ + u8 ts_pen_detect_sensitivity; + + /* startup time calculate function */ + u32 (*calc_startup_ticks)(u32 startup_time, u32 adc_clk_khz); + + u8 num_channels; + struct at91_adc_reg_desc registers; +}; + +struct at91_adc_state { + struct clk *adc_clk; + u16 *buffer; + unsigned long channels_mask; + struct clk *clk; + bool done; + int irq; + u16 last_value; + int chnb; + struct mutex lock; + u8 num_channels; + void __iomem *reg_base; + struct at91_adc_reg_desc *registers; + u32 startup_time; + u8 sample_hold_time; + bool sleep_mode; + struct iio_trigger **trig; + struct at91_adc_trigger *trigger_list; + u32 trigger_number; + bool use_external; + u32 vref_mv; + u32 res; /* resolution used for convertions */ + bool low_res; /* the resolution corresponds to the lowest one */ + wait_queue_head_t wq_data_avail; + struct at91_adc_caps *caps; + + /* + * Following ADC channels are shared by touchscreen: + * + * CH0 -- Touch screen XP/UL + * CH1 -- Touch screen XM/UR + * CH2 -- Touch screen YP/LL + * CH3 -- Touch screen YM/Sense + * CH4 -- Touch screen LR(5-wire only) + * + * The bitfields below represents the reserved channel in the + * touchscreen mode. + */ +#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 0) +#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 0) + enum atmel_adc_ts_type touchscreen_type; + struct input_dev *ts_input; + + u16 ts_sample_period_val; + u32 ts_pressure_threshold; + u16 ts_pendbc; + + bool ts_bufferedmeasure; + u32 ts_prev_absx; + u32 ts_prev_absy; +}; + +static irqreturn_t at91_adc_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *idev = pf->indio_dev; + struct at91_adc_state *st = iio_priv(idev); + struct iio_chan_spec const *chan; + int i, j = 0; + + for (i = 0; i < idev->masklength; i++) { + if (!test_bit(i, idev->active_scan_mask)) + continue; + chan = idev->channels + i; + st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel)); + j++; + } + + iio_push_to_buffers_with_timestamp(idev, st->buffer, pf->timestamp); + + iio_trigger_notify_done(idev->trig); + + /* Needed to ACK the DRDY interruption */ + at91_adc_readl(st, AT91_ADC_LCDR); + + enable_irq(st->irq); + + return IRQ_HANDLED; +} + +/* Handler for classic adc channel eoc trigger */ +static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) +{ + struct at91_adc_state *st = iio_priv(idev); + + if (iio_buffer_enabled(idev)) { + disable_irq_nosync(irq); + iio_trigger_poll(idev->trig); + } else { + st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb)); + /* Needed to ACK the DRDY interruption */ + at91_adc_readl(st, AT91_ADC_LCDR); + st->done = true; + wake_up_interruptible(&st->wq_data_avail); + } +} + +static int at91_ts_sample(struct at91_adc_state *st) +{ + unsigned int xscale, yscale, reg, z1, z2; + unsigned int x, y, pres, xpos, ypos; + unsigned int rxp = 1; + unsigned int factor = 1000; + struct iio_dev *idev = iio_priv_to_dev(st); + + unsigned int xyz_mask_bits = st->res; + unsigned int xyz_mask = (1 << xyz_mask_bits) - 1; + + /* calculate position */ + /* x position = (x / xscale) * max, max = 2^MAX_POS_BITS - 1 */ + reg = at91_adc_readl(st, AT91_ADC_TSXPOSR); + xpos = reg & xyz_mask; + x = (xpos << MAX_POS_BITS) - xpos; + xscale = (reg >> 16) & xyz_mask; + if (xscale == 0) { + dev_err(&idev->dev, "Error: xscale == 0!\n"); + return -1; + } + x /= xscale; + + /* y position = (y / yscale) * max, max = 2^MAX_POS_BITS - 1 */ + reg = at91_adc_readl(st, AT91_ADC_TSYPOSR); + ypos = reg & xyz_mask; + y = (ypos << MAX_POS_BITS) - ypos; + yscale = (reg >> 16) & xyz_mask; + if (yscale == 0) { + dev_err(&idev->dev, "Error: yscale == 0!\n"); + return -1; + } + y /= yscale; + + /* calculate the pressure */ + reg = at91_adc_readl(st, AT91_ADC_TSPRESSR); + z1 = reg & xyz_mask; + z2 = (reg >> 16) & xyz_mask; + + if (z1 != 0) + pres = rxp * (x * factor / 1024) * (z2 * factor / z1 - factor) + / factor; + else + pres = st->ts_pressure_threshold; /* no pen contacted */ + + dev_dbg(&idev->dev, "xpos = %d, xscale = %d, ypos = %d, yscale = %d, z1 = %d, z2 = %d, press = %d\n", + xpos, xscale, ypos, yscale, z1, z2, pres); + + if (pres < st->ts_pressure_threshold) { + dev_dbg(&idev->dev, "x = %d, y = %d, pressure = %d\n", + x, y, pres / factor); + input_report_abs(st->ts_input, ABS_X, x); + input_report_abs(st->ts_input, ABS_Y, y); + input_report_abs(st->ts_input, ABS_PRESSURE, pres); + input_report_key(st->ts_input, BTN_TOUCH, 1); + input_sync(st->ts_input); + } else { + dev_dbg(&idev->dev, "pressure too low: not reporting\n"); + } + + return 0; +} + +static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) +{ + struct iio_dev *idev = private; + struct at91_adc_state *st = iio_priv(idev); + u32 status = at91_adc_readl(st, st->registers->status_register); + unsigned int reg; + + status &= at91_adc_readl(st, AT91_ADC_IMR); + if (status & GENMASK(st->num_channels - 1, 0)) + handle_adc_eoc_trigger(irq, idev); + + if (status & AT91RL_ADC_IER_PEN) { + /* Disabling pen debounce is required to get a NOPEN irq */ + reg = at91_adc_readl(st, AT91_ADC_MR); + reg &= ~AT91_ADC_PENDBC; + at91_adc_writel(st, AT91_ADC_MR, reg); + + at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN); + at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_NOPEN + | AT91_ADC_EOC(3)); + /* Set up period trigger for sampling */ + at91_adc_writel(st, st->registers->trigger_register, + AT91_ADC_TRGR_MOD_PERIOD_TRIG | + AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val)); + } else if (status & AT91RL_ADC_IER_NOPEN) { + reg = at91_adc_readl(st, AT91_ADC_MR); + reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC; + at91_adc_writel(st, AT91_ADC_MR, reg); + at91_adc_writel(st, st->registers->trigger_register, + AT91_ADC_TRGR_NONE); + + at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_NOPEN + | AT91_ADC_EOC(3)); + at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN); + st->ts_bufferedmeasure = false; + input_report_key(st->ts_input, BTN_TOUCH, 0); + input_sync(st->ts_input); + } else if (status & AT91_ADC_EOC(3) && st->ts_input) { + /* Conversion finished and we've a touchscreen */ + if (st->ts_bufferedmeasure) { + /* + * Last measurement is always discarded, since it can + * be erroneous. + * Always report previous measurement + */ + input_report_abs(st->ts_input, ABS_X, st->ts_prev_absx); + input_report_abs(st->ts_input, ABS_Y, st->ts_prev_absy); + input_report_key(st->ts_input, BTN_TOUCH, 1); + input_sync(st->ts_input); + } else + st->ts_bufferedmeasure = true; + + /* Now make new measurement */ + st->ts_prev_absx = at91_adc_readl(st, AT91_ADC_CHAN(st, 3)) + << MAX_RLPOS_BITS; + st->ts_prev_absx /= at91_adc_readl(st, AT91_ADC_CHAN(st, 2)); + + st->ts_prev_absy = at91_adc_readl(st, AT91_ADC_CHAN(st, 1)) + << MAX_RLPOS_BITS; + st->ts_prev_absy /= at91_adc_readl(st, AT91_ADC_CHAN(st, 0)); + } + + return IRQ_HANDLED; +} + +static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) +{ + struct iio_dev *idev = private; + struct at91_adc_state *st = iio_priv(idev); + u32 status = at91_adc_readl(st, st->registers->status_register); + const uint32_t ts_data_irq_mask = + AT91_ADC_IER_XRDY | + AT91_ADC_IER_YRDY | + AT91_ADC_IER_PRDY; + + if (status & GENMASK(st->num_channels - 1, 0)) + handle_adc_eoc_trigger(irq, idev); + + if (status & AT91_ADC_IER_PEN) { + at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN); + at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_NOPEN | + ts_data_irq_mask); + /* Set up period trigger for sampling */ + at91_adc_writel(st, st->registers->trigger_register, + AT91_ADC_TRGR_MOD_PERIOD_TRIG | + AT91_ADC_TRGR_TRGPER_(st->ts_sample_period_val)); + } else if (status & AT91_ADC_IER_NOPEN) { + at91_adc_writel(st, st->registers->trigger_register, 0); + at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_NOPEN | + ts_data_irq_mask); + at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN); + + input_report_key(st->ts_input, BTN_TOUCH, 0); + input_sync(st->ts_input); + } else if ((status & ts_data_irq_mask) == ts_data_irq_mask) { + /* Now all touchscreen data is ready */ + + if (status & AT91_ADC_ISR_PENS) { + /* validate data by pen contact */ + at91_ts_sample(st); + } else { + /* triggered by event that is no pen contact, just read + * them to clean the interrupt and discard all. + */ + at91_adc_readl(st, AT91_ADC_TSXPOSR); + at91_adc_readl(st, AT91_ADC_TSYPOSR); + at91_adc_readl(st, AT91_ADC_TSPRESSR); + } + } + + return IRQ_HANDLED; +} + +static int at91_adc_channel_init(struct iio_dev *idev) +{ + struct at91_adc_state *st = iio_priv(idev); + struct iio_chan_spec *chan_array, *timestamp; + int bit, idx = 0; + unsigned long rsvd_mask = 0; + + /* If touchscreen is enable, then reserve the adc channels */ + if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE) + rsvd_mask = CHAN_MASK_TOUCHSCREEN_4WIRE; + else if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_5WIRE) + rsvd_mask = CHAN_MASK_TOUCHSCREEN_5WIRE; + + /* set up the channel mask to reserve touchscreen channels */ + st->channels_mask &= ~rsvd_mask; + + idev->num_channels = bitmap_weight(&st->channels_mask, + st->num_channels) + 1; + + chan_array = devm_kzalloc(&idev->dev, + ((idev->num_channels + 1) * + sizeof(struct iio_chan_spec)), + GFP_KERNEL); + + if (!chan_array) + return -ENOMEM; + + for_each_set_bit(bit, &st->channels_mask, st->num_channels) { + struct iio_chan_spec *chan = chan_array + idx; + + chan->type = IIO_VOLTAGE; + chan->indexed = 1; + chan->channel = bit; + chan->scan_index = idx; + chan->scan_type.sign = 'u'; + chan->scan_type.realbits = st->res; + chan->scan_type.storagebits = 16; + chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + idx++; + } + timestamp = chan_array + idx; + + timestamp->type = IIO_TIMESTAMP; + timestamp->channel = -1; + timestamp->scan_index = idx; + timestamp->scan_type.sign = 's'; + timestamp->scan_type.realbits = 64; + timestamp->scan_type.storagebits = 64; + + idev->channels = chan_array; + return idev->num_channels; +} + +static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev, + struct at91_adc_trigger *triggers, + const char *trigger_name) +{ + struct at91_adc_state *st = iio_priv(idev); + int i; + + for (i = 0; i < st->trigger_number; i++) { + char *name = kasprintf(GFP_KERNEL, + "%s-dev%d-%s", + idev->name, + idev->id, + triggers[i].name); + if (!name) + return -ENOMEM; + + if (strcmp(trigger_name, name) == 0) { + kfree(name); + if (triggers[i].value == 0) + return -EINVAL; + return triggers[i].value; + } + + kfree(name); + } + + return -EINVAL; +} + +static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) +{ + struct iio_dev *idev = iio_trigger_get_drvdata(trig); + struct at91_adc_state *st = iio_priv(idev); + struct at91_adc_reg_desc *reg = st->registers; + u32 status = at91_adc_readl(st, reg->trigger_register); + int value; + u8 bit; + + value = at91_adc_get_trigger_value_by_name(idev, + st->trigger_list, + idev->trig->name); + if (value < 0) + return value; + + if (state) { + st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL); + if (st->buffer == NULL) + return -ENOMEM; + + at91_adc_writel(st, reg->trigger_register, + status | value); + + for_each_set_bit(bit, idev->active_scan_mask, + st->num_channels) { + struct iio_chan_spec const *chan = idev->channels + bit; + at91_adc_writel(st, AT91_ADC_CHER, + AT91_ADC_CH(chan->channel)); + } + + at91_adc_writel(st, AT91_ADC_IER, reg->drdy_mask); + + } else { + at91_adc_writel(st, AT91_ADC_IDR, reg->drdy_mask); + + at91_adc_writel(st, reg->trigger_register, + status & ~value); + + for_each_set_bit(bit, idev->active_scan_mask, + st->num_channels) { + struct iio_chan_spec const *chan = idev->channels + bit; + at91_adc_writel(st, AT91_ADC_CHDR, + AT91_ADC_CH(chan->channel)); + } + kfree(st->buffer); + } + + return 0; +} + +static const struct iio_trigger_ops at91_adc_trigger_ops = { + .set_trigger_state = &at91_adc_configure_trigger, +}; + +static struct iio_trigger *at91_adc_allocate_trigger(struct iio_dev *idev, + struct at91_adc_trigger *trigger) +{ + struct iio_trigger *trig; + int ret; + + trig = iio_trigger_alloc("%s-dev%d-%s", idev->name, + idev->id, trigger->name); + if (trig == NULL) + return NULL; + + trig->dev.parent = idev->dev.parent; + iio_trigger_set_drvdata(trig, idev); + trig->ops = &at91_adc_trigger_ops; + + ret = iio_trigger_register(trig); + if (ret) + return NULL; + + return trig; +} + +static int at91_adc_trigger_init(struct iio_dev *idev) +{ + struct at91_adc_state *st = iio_priv(idev); + int i, ret; + + st->trig = devm_kcalloc(&idev->dev, + st->trigger_number, sizeof(*st->trig), + GFP_KERNEL); + + if (st->trig == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + for (i = 0; i < st->trigger_number; i++) { + if (st->trigger_list[i].is_external && !(st->use_external)) + continue; + + st->trig[i] = at91_adc_allocate_trigger(idev, + st->trigger_list + i); + if (st->trig[i] == NULL) { + dev_err(&idev->dev, + "Could not allocate trigger %d\n", i); + ret = -ENOMEM; + goto error_trigger; + } + } + + return 0; + +error_trigger: + for (i--; i >= 0; i--) { + iio_trigger_unregister(st->trig[i]); + iio_trigger_free(st->trig[i]); + } +error_ret: + return ret; +} + +static void at91_adc_trigger_remove(struct iio_dev *idev) +{ + struct at91_adc_state *st = iio_priv(idev); + int i; + + for (i = 0; i < st->trigger_number; i++) { + iio_trigger_unregister(st->trig[i]); + iio_trigger_free(st->trig[i]); + } +} + +static int at91_adc_buffer_init(struct iio_dev *idev) +{ + return iio_triggered_buffer_setup(idev, &iio_pollfunc_store_time, + &at91_adc_trigger_handler, NULL); +} + +static void at91_adc_buffer_remove(struct iio_dev *idev) +{ + iio_triggered_buffer_cleanup(idev); +} + +static int at91_adc_read_raw(struct iio_dev *idev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct at91_adc_state *st = iio_priv(idev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + mutex_lock(&st->lock); + + st->chnb = chan->channel; + at91_adc_writel(st, AT91_ADC_CHER, + AT91_ADC_CH(chan->channel)); + at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel)); + at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); + + ret = wait_event_interruptible_timeout(st->wq_data_avail, + st->done, + msecs_to_jiffies(1000)); + + /* Disable interrupts, regardless if adc conversion was + * successful or not + */ + at91_adc_writel(st, AT91_ADC_CHDR, + AT91_ADC_CH(chan->channel)); + at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel)); + + if (ret > 0) { + /* a valid conversion took place */ + *val = st->last_value; + st->last_value = 0; + st->done = false; + ret = IIO_VAL_INT; + } else if (ret == 0) { + /* conversion timeout */ + dev_err(&idev->dev, "ADC Channel %d timeout.\n", + chan->channel); + ret = -ETIMEDOUT; + } + + mutex_unlock(&st->lock); + return ret; + + case IIO_CHAN_INFO_SCALE: + *val = st->vref_mv; + *val2 = chan->scan_type.realbits; + return IIO_VAL_FRACTIONAL_LOG2; + default: + break; + } + return -EINVAL; +} + +static int at91_adc_of_get_resolution(struct at91_adc_state *st, + struct platform_device *pdev) +{ + struct iio_dev *idev = iio_priv_to_dev(st); + struct device_node *np = pdev->dev.of_node; + int count, i, ret = 0; + char *res_name, *s; + u32 *resolutions; + + count = of_property_count_strings(np, "atmel,adc-res-names"); + if (count < 2) { + dev_err(&idev->dev, "You must specified at least two resolution names for " + "adc-res-names property in the DT\n"); + return count; + } + + resolutions = kmalloc_array(count, sizeof(*resolutions), GFP_KERNEL); + if (!resolutions) + return -ENOMEM; + + if (of_property_read_u32_array(np, "atmel,adc-res", resolutions, count)) { + dev_err(&idev->dev, "Missing adc-res property in the DT.\n"); + ret = -ENODEV; + goto ret; + } + + if (of_property_read_string(np, "atmel,adc-use-res", (const char **)&res_name)) + res_name = "highres"; + + for (i = 0; i < count; i++) { + if (of_property_read_string_index(np, "atmel,adc-res-names", i, (const char **)&s)) + continue; + + if (strcmp(res_name, s)) + continue; + + st->res = resolutions[i]; + if (!strcmp(res_name, "lowres")) + st->low_res = true; + else + st->low_res = false; + + dev_info(&idev->dev, "Resolution used: %u bits\n", st->res); + goto ret; + } + + dev_err(&idev->dev, "There is no resolution for %s\n", res_name); + +ret: + kfree(resolutions); + return ret; +} + +static u32 calc_startup_ticks_9260(u32 startup_time, u32 adc_clk_khz) +{ + /* + * Number of ticks needed to cover the startup time of the ADC + * as defined in the electrical characteristics of the board, + * divided by 8. The formula thus is : + * Startup Time = (ticks + 1) * 8 / ADC Clock + */ + return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8; +} + +static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz) +{ + /* + * For sama5d3x and at91sam9x5, the formula changes to: + * Startup Time = <lookup_table_value> / ADC Clock + */ + static const int startup_lookup[] = { + 0, 8, 16, 24, + 64, 80, 96, 112, + 512, 576, 640, 704, + 768, 832, 896, 960 + }; + int i, size = ARRAY_SIZE(startup_lookup); + unsigned int ticks; + + ticks = startup_time * adc_clk_khz / 1000; + for (i = 0; i < size; i++) + if (ticks < startup_lookup[i]) + break; + + ticks = i; + if (ticks == size) + /* Reach the end of lookup table */ + ticks = size - 1; + + return ticks; +} + +static const struct of_device_id at91_adc_dt_ids[]; + +static int at91_adc_probe_dt_ts(struct device_node *node, + struct at91_adc_state *st, struct device *dev) +{ + int ret; + u32 prop; + + ret = of_property_read_u32(node, "atmel,adc-ts-wires", &prop); + if (ret) { + dev_info(dev, "ADC Touch screen is disabled.\n"); + return 0; + } + + switch (prop) { + case 4: + case 5: + st->touchscreen_type = prop; + break; + default: + dev_err(dev, "Unsupported number of touchscreen wires (%d). Should be 4 or 5.\n", prop); + return -EINVAL; + } + + if (!st->caps->has_tsmr) + return 0; + prop = 0; + of_property_read_u32(node, "atmel,adc-ts-pressure-threshold", &prop); + st->ts_pressure_threshold = prop; + if (st->ts_pressure_threshold) { + return 0; + } else { + dev_err(dev, "Invalid pressure threshold for the touchscreen\n"); + return -EINVAL; + } +} + +static int at91_adc_probe_dt(struct at91_adc_state *st, + struct platform_device *pdev) +{ + struct iio_dev *idev = iio_priv_to_dev(st); + struct device_node *node = pdev->dev.of_node; + struct device_node *trig_node; + int i = 0, ret; + u32 prop; + + if (!node) + return -EINVAL; + + st->caps = (struct at91_adc_caps *) + of_match_device(at91_adc_dt_ids, &pdev->dev)->data; + + st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers"); + + if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) { + dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n"); + ret = -EINVAL; + goto error_ret; + } + st->channels_mask = prop; + + st->sleep_mode = of_property_read_bool(node, "atmel,adc-sleep-mode"); + + if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) { + dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n"); + ret = -EINVAL; + goto error_ret; + } + st->startup_time = prop; + + prop = 0; + of_property_read_u32(node, "atmel,adc-sample-hold-time", &prop); + st->sample_hold_time = prop; + + if (of_property_read_u32(node, "atmel,adc-vref", &prop)) { + dev_err(&idev->dev, "Missing adc-vref property in the DT.\n"); + ret = -EINVAL; + goto error_ret; + } + st->vref_mv = prop; + + ret = at91_adc_of_get_resolution(st, pdev); + if (ret) + goto error_ret; + + st->registers = &st->caps->registers; + st->num_channels = st->caps->num_channels; + st->trigger_number = of_get_child_count(node); + st->trigger_list = devm_kcalloc(&idev->dev, + st->trigger_number, + sizeof(struct at91_adc_trigger), + GFP_KERNEL); + if (!st->trigger_list) { + dev_err(&idev->dev, "Could not allocate trigger list memory.\n"); + ret = -ENOMEM; + goto error_ret; + } + + for_each_child_of_node(node, trig_node) { + struct at91_adc_trigger *trig = st->trigger_list + i; + const char *name; + + if (of_property_read_string(trig_node, "trigger-name", &name)) { + dev_err(&idev->dev, "Missing trigger-name property in the DT.\n"); + ret = -EINVAL; + goto error_ret; + } + trig->name = name; + + if (of_property_read_u32(trig_node, "trigger-value", &prop)) { + dev_err(&idev->dev, "Missing trigger-value property in the DT.\n"); + ret = -EINVAL; + goto error_ret; + } + trig->value = prop; + trig->is_external = of_property_read_bool(trig_node, "trigger-external"); + i++; + } + + /* Check if touchscreen is supported. */ + if (st->caps->has_ts) + return at91_adc_probe_dt_ts(node, st, &idev->dev); + else + dev_info(&idev->dev, "not support touchscreen in the adc compatible string.\n"); + + return 0; + +error_ret: + return ret; +} + +static int at91_adc_probe_pdata(struct at91_adc_state *st, + struct platform_device *pdev) +{ + struct at91_adc_data *pdata = pdev->dev.platform_data; + + if (!pdata) + return -EINVAL; + + st->caps = (struct at91_adc_caps *) + platform_get_device_id(pdev)->driver_data; + + st->use_external = pdata->use_external_triggers; + st->vref_mv = pdata->vref; + st->channels_mask = pdata->channels_used; + st->num_channels = st->caps->num_channels; + st->startup_time = pdata->startup_time; + st->trigger_number = pdata->trigger_number; + st->trigger_list = pdata->trigger_list; + st->registers = &st->caps->registers; + st->touchscreen_type = pdata->touchscreen_type; + + return 0; +} + +static const struct iio_info at91_adc_info = { + .read_raw = &at91_adc_read_raw, +}; + +/* Touchscreen related functions */ +static int atmel_ts_open(struct input_dev *dev) +{ + struct at91_adc_state *st = input_get_drvdata(dev); + + if (st->caps->has_tsmr) + at91_adc_writel(st, AT91_ADC_IER, AT91_ADC_IER_PEN); + else + at91_adc_writel(st, AT91_ADC_IER, AT91RL_ADC_IER_PEN); + return 0; +} + +static void atmel_ts_close(struct input_dev *dev) +{ + struct at91_adc_state *st = input_get_drvdata(dev); + + if (st->caps->has_tsmr) + at91_adc_writel(st, AT91_ADC_IDR, AT91_ADC_IER_PEN); + else + at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN); +} + +static int at91_ts_hw_init(struct at91_adc_state *st, u32 adc_clk_khz) +{ + struct iio_dev *idev = iio_priv_to_dev(st); + u32 reg = 0; + u32 tssctim = 0; + int i = 0; + + /* a Pen Detect Debounce Time is necessary for the ADC Touch to avoid + * pen detect noise. + * The formula is : Pen Detect Debounce Time = (2 ^ pendbc) / ADCClock + */ + st->ts_pendbc = round_up(TOUCH_PEN_DETECT_DEBOUNCE_US * adc_clk_khz / + 1000, 1); + + while (st->ts_pendbc >> ++i) + ; /* Empty! Find the shift offset */ + if (abs(st->ts_pendbc - (1 << i)) < abs(st->ts_pendbc - (1 << (i - 1)))) + st->ts_pendbc = i; + else + st->ts_pendbc = i - 1; + + if (!st->caps->has_tsmr) { + reg = at91_adc_readl(st, AT91_ADC_MR); + reg |= AT91_ADC_TSAMOD_TS_ONLY_MODE | AT91_ADC_PENDET; + + reg |= AT91_ADC_PENDBC_(st->ts_pendbc) & AT91_ADC_PENDBC; + at91_adc_writel(st, AT91_ADC_MR, reg); + + reg = AT91_ADC_TSR_SHTIM_(TOUCH_SHTIM) & AT91_ADC_TSR_SHTIM; + at91_adc_writel(st, AT91_ADC_TSR, reg); + + st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US_RL * + adc_clk_khz / 1000) - 1, 1); + + return 0; + } + + /* Touchscreen Switches Closure time needed for allowing the value to + * stabilize. + * Switch Closure Time = (TSSCTIM * 4) ADCClock periods + */ + tssctim = DIV_ROUND_UP(TOUCH_SCTIM_US * adc_clk_khz / 1000, 4); + dev_dbg(&idev->dev, "adc_clk at: %d KHz, tssctim at: %d\n", + adc_clk_khz, tssctim); + + if (st->touchscreen_type == ATMEL_ADC_TOUCHSCREEN_4WIRE) + reg = AT91_ADC_TSMR_TSMODE_4WIRE_PRESS; + else + reg = AT91_ADC_TSMR_TSMODE_5WIRE; + + reg |= AT91_ADC_TSMR_SCTIM_(tssctim) & AT91_ADC_TSMR_SCTIM; + reg |= AT91_ADC_TSMR_TSAV_(st->caps->ts_filter_average) + & AT91_ADC_TSMR_TSAV; + reg |= AT91_ADC_TSMR_PENDBC_(st->ts_pendbc) & AT91_ADC_TSMR_PENDBC; + reg |= AT91_ADC_TSMR_NOTSDMA; + reg |= AT91_ADC_TSMR_PENDET_ENA; + reg |= 0x03 << 8; /* TSFREQ, needs to be bigger than TSAV */ + + at91_adc_writel(st, AT91_ADC_TSMR, reg); + + /* Change adc internal resistor value for better pen detection, + * default value is 100 kOhm. + * 0 = 200 kOhm, 1 = 150 kOhm, 2 = 100 kOhm, 3 = 50 kOhm + * option only available on ES2 and higher + */ + at91_adc_writel(st, AT91_ADC_ACR, st->caps->ts_pen_detect_sensitivity + & AT91_ADC_ACR_PENDETSENS); + + /* Sample Period Time = (TRGPER + 1) / ADCClock */ + st->ts_sample_period_val = round_up((TOUCH_SAMPLE_PERIOD_US * + adc_clk_khz / 1000) - 1, 1); + + return 0; +} + +static int at91_ts_register(struct at91_adc_state *st, + struct platform_device *pdev) +{ + struct input_dev *input; + struct iio_dev *idev = iio_priv_to_dev(st); + int ret; + + input = input_allocate_device(); + if (!input) { + dev_err(&idev->dev, "Failed to allocate TS device!\n"); + return -ENOMEM; + } + + input->name = DRIVER_NAME; + input->id.bustype = BUS_HOST; + input->dev.parent = &pdev->dev; + input->open = atmel_ts_open; + input->close = atmel_ts_close; + + __set_bit(EV_ABS, input->evbit); + __set_bit(EV_KEY, input->evbit); + __set_bit(BTN_TOUCH, input->keybit); + if (st->caps->has_tsmr) { + input_set_abs_params(input, ABS_X, 0, (1 << MAX_POS_BITS) - 1, + 0, 0); + input_set_abs_params(input, ABS_Y, 0, (1 << MAX_POS_BITS) - 1, + 0, 0); + input_set_abs_params(input, ABS_PRESSURE, 0, 0xffffff, 0, 0); + } else { + if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) { + dev_err(&pdev->dev, + "This touchscreen controller only support 4 wires\n"); + ret = -EINVAL; + goto err; + } + + input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1, + 0, 0); + input_set_abs_params(input, ABS_Y, 0, (1 << MAX_RLPOS_BITS) - 1, + 0, 0); + } + + st->ts_input = input; + input_set_drvdata(input, st); + + ret = input_register_device(input); + if (ret) + goto err; + + return ret; + +err: + input_free_device(st->ts_input); + return ret; +} + +static void at91_ts_unregister(struct at91_adc_state *st) +{ + input_unregister_device(st->ts_input); +} + +static int at91_adc_probe(struct platform_device *pdev) +{ + unsigned int prsc, mstrclk, ticks, adc_clk, adc_clk_khz, shtim; + int ret; + struct iio_dev *idev; + struct at91_adc_state *st; + struct resource *res; + u32 reg; + + idev = devm_iio_device_alloc(&pdev->dev, sizeof(struct at91_adc_state)); + if (!idev) + return -ENOMEM; + + st = iio_priv(idev); + + if (pdev->dev.of_node) + ret = at91_adc_probe_dt(st, pdev); + else + ret = at91_adc_probe_pdata(st, pdev); + + if (ret) { + dev_err(&pdev->dev, "No platform data available.\n"); + return -EINVAL; + } + + platform_set_drvdata(pdev, idev); + + idev->dev.parent = &pdev->dev; + idev->name = dev_name(&pdev->dev); + idev->modes = INDIO_DIRECT_MODE; + idev->info = &at91_adc_info; + + st->irq = platform_get_irq(pdev, 0); + if (st->irq < 0) { + dev_err(&pdev->dev, "No IRQ ID is designated\n"); + return -ENODEV; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + st->reg_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(st->reg_base)) + return PTR_ERR(st->reg_base); + + + /* + * Disable all IRQs before setting up the handler + */ + at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_SWRST); + at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF); + + if (st->caps->has_tsmr) + ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0, + pdev->dev.driver->name, idev); + else + ret = request_irq(st->irq, at91_adc_rl_interrupt, 0, + pdev->dev.driver->name, idev); + if (ret) { + dev_err(&pdev->dev, "Failed to allocate IRQ.\n"); + return ret; + } + + st->clk = devm_clk_get(&pdev->dev, "adc_clk"); + if (IS_ERR(st->clk)) { + dev_err(&pdev->dev, "Failed to get the clock.\n"); + ret = PTR_ERR(st->clk); + goto error_free_irq; + } + + ret = clk_prepare_enable(st->clk); + if (ret) { + dev_err(&pdev->dev, + "Could not prepare or enable the clock.\n"); + goto error_free_irq; + } + + st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk"); + if (IS_ERR(st->adc_clk)) { + dev_err(&pdev->dev, "Failed to get the ADC clock.\n"); + ret = PTR_ERR(st->adc_clk); + goto error_disable_clk; + } + + ret = clk_prepare_enable(st->adc_clk); + if (ret) { + dev_err(&pdev->dev, + "Could not prepare or enable the ADC clock.\n"); + goto error_disable_clk; + } + + /* + * Prescaler rate computation using the formula from the Atmel's + * datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being + * specified by the electrical characteristics of the board. + */ + mstrclk = clk_get_rate(st->clk); + adc_clk = clk_get_rate(st->adc_clk); + adc_clk_khz = adc_clk / 1000; + + dev_dbg(&pdev->dev, "Master clock is set as: %d Hz, adc_clk should set as: %d Hz\n", + mstrclk, adc_clk); + + prsc = (mstrclk / (2 * adc_clk)) - 1; + + if (!st->startup_time) { + dev_err(&pdev->dev, "No startup time available.\n"); + ret = -EINVAL; + goto error_disable_adc_clk; + } + ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz); + + /* + * a minimal Sample and Hold Time is necessary for the ADC to guarantee + * the best converted final value between two channels selection + * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock + */ + if (st->sample_hold_time > 0) + shtim = round_up((st->sample_hold_time * adc_clk_khz / 1000) + - 1, 1); + else + shtim = 0; + + reg = AT91_ADC_PRESCAL_(prsc) & st->registers->mr_prescal_mask; + reg |= AT91_ADC_STARTUP_(ticks) & st->registers->mr_startup_mask; + if (st->low_res) + reg |= AT91_ADC_LOWRES; + if (st->sleep_mode) + reg |= AT91_ADC_SLEEP; + reg |= AT91_ADC_SHTIM_(shtim) & AT91_ADC_SHTIM; + at91_adc_writel(st, AT91_ADC_MR, reg); + + /* Setup the ADC channels available on the board */ + ret = at91_adc_channel_init(idev); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't initialize the channels.\n"); + goto error_disable_adc_clk; + } + + init_waitqueue_head(&st->wq_data_avail); + mutex_init(&st->lock); + + /* + * Since touch screen will set trigger register as period trigger. So + * when touch screen is enabled, then we have to disable hardware + * trigger for classic adc. + */ + if (!st->touchscreen_type) { + ret = at91_adc_buffer_init(idev); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't initialize the buffer.\n"); + goto error_disable_adc_clk; + } + + ret = at91_adc_trigger_init(idev); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't setup the triggers.\n"); + at91_adc_buffer_remove(idev); + goto error_disable_adc_clk; + } + } else { + ret = at91_ts_register(st, pdev); + if (ret) + goto error_disable_adc_clk; + + at91_ts_hw_init(st, adc_clk_khz); + } + + ret = iio_device_register(idev); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't register the device.\n"); + goto error_iio_device_register; + } + + return 0; + +error_iio_device_register: + if (!st->touchscreen_type) { + at91_adc_trigger_remove(idev); + at91_adc_buffer_remove(idev); + } else { + at91_ts_unregister(st); + } +error_disable_adc_clk: + clk_disable_unprepare(st->adc_clk); +error_disable_clk: + clk_disable_unprepare(st->clk); +error_free_irq: + free_irq(st->irq, idev); + return ret; +} + +static int at91_adc_remove(struct platform_device *pdev) +{ + struct iio_dev *idev = platform_get_drvdata(pdev); + struct at91_adc_state *st = iio_priv(idev); + + iio_device_unregister(idev); + if (!st->touchscreen_type) { + at91_adc_trigger_remove(idev); + at91_adc_buffer_remove(idev); + } else { + at91_ts_unregister(st); + } + clk_disable_unprepare(st->adc_clk); + clk_disable_unprepare(st->clk); + free_irq(st->irq, idev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int at91_adc_suspend(struct device *dev) +{ + struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev)); + struct at91_adc_state *st = iio_priv(idev); + + pinctrl_pm_select_sleep_state(dev); + clk_disable_unprepare(st->clk); + + return 0; +} + +static int at91_adc_resume(struct device *dev) +{ + struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev)); + struct at91_adc_state *st = iio_priv(idev); + + clk_prepare_enable(st->clk); + pinctrl_pm_select_default_state(dev); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume); + +static struct at91_adc_caps at91sam9260_caps = { + .calc_startup_ticks = calc_startup_ticks_9260, + .num_channels = 4, + .registers = { + .channel_base = AT91_ADC_CHR(0), + .drdy_mask = AT91_ADC_DRDY, + .status_register = AT91_ADC_SR, + .trigger_register = AT91_ADC_TRGR_9260, + .mr_prescal_mask = AT91_ADC_PRESCAL_9260, + .mr_startup_mask = AT91_ADC_STARTUP_9260, + }, +}; + +static struct at91_adc_caps at91sam9rl_caps = { + .has_ts = true, + .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ + .num_channels = 6, + .registers = { + .channel_base = AT91_ADC_CHR(0), + .drdy_mask = AT91_ADC_DRDY, + .status_register = AT91_ADC_SR, + .trigger_register = AT91_ADC_TRGR_9G45, + .mr_prescal_mask = AT91_ADC_PRESCAL_9260, + .mr_startup_mask = AT91_ADC_STARTUP_9G45, + }, +}; + +static struct at91_adc_caps at91sam9g45_caps = { + .has_ts = true, + .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ + .num_channels = 8, + .registers = { + .channel_base = AT91_ADC_CHR(0), + .drdy_mask = AT91_ADC_DRDY, + .status_register = AT91_ADC_SR, + .trigger_register = AT91_ADC_TRGR_9G45, + .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, + .mr_startup_mask = AT91_ADC_STARTUP_9G45, + }, +}; + +static struct at91_adc_caps at91sam9x5_caps = { + .has_ts = true, + .has_tsmr = true, + .ts_filter_average = 3, + .ts_pen_detect_sensitivity = 2, + .calc_startup_ticks = calc_startup_ticks_9x5, + .num_channels = 12, + .registers = { + .channel_base = AT91_ADC_CDR0_9X5, + .drdy_mask = AT91_ADC_SR_DRDY_9X5, + .status_register = AT91_ADC_SR_9X5, + .trigger_register = AT91_ADC_TRGR_9X5, + /* prescal mask is same as 9G45 */ + .mr_prescal_mask = AT91_ADC_PRESCAL_9G45, + .mr_startup_mask = AT91_ADC_STARTUP_9X5, + }, +}; + +static const struct of_device_id at91_adc_dt_ids[] = { + { .compatible = "atmel,at91sam9260-adc", .data = &at91sam9260_caps }, + { .compatible = "atmel,at91sam9rl-adc", .data = &at91sam9rl_caps }, + { .compatible = "atmel,at91sam9g45-adc", .data = &at91sam9g45_caps }, + { .compatible = "atmel,at91sam9x5-adc", .data = &at91sam9x5_caps }, + {}, +}; +MODULE_DEVICE_TABLE(of, at91_adc_dt_ids); + +static const struct platform_device_id at91_adc_ids[] = { + { + .name = "at91sam9260-adc", + .driver_data = (unsigned long)&at91sam9260_caps, + }, { + .name = "at91sam9rl-adc", + .driver_data = (unsigned long)&at91sam9rl_caps, + }, { + .name = "at91sam9g45-adc", + .driver_data = (unsigned long)&at91sam9g45_caps, + }, { + .name = "at91sam9x5-adc", + .driver_data = (unsigned long)&at91sam9x5_caps, + }, { + /* terminator */ + } +}; +MODULE_DEVICE_TABLE(platform, at91_adc_ids); + +static struct platform_driver at91_adc_driver = { + .probe = at91_adc_probe, + .remove = at91_adc_remove, + .id_table = at91_adc_ids, + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(at91_adc_dt_ids), + .pm = &at91_adc_pm_ops, + }, +}; + +module_platform_driver(at91_adc_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Atmel AT91 ADC Driver"); +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); |