diff options
Diffstat (limited to 'drivers/staging/iio/adc/mxs-lradc.c')
-rw-r--r-- | drivers/staging/iio/adc/mxs-lradc.c | 996 |
1 files changed, 680 insertions, 316 deletions
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c index a08c173..aeae76b 100644 --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -35,6 +35,7 @@ #include <linux/completion.h> #include <linux/delay.h> #include <linux/input.h> +#include <linux/clk.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> @@ -129,11 +130,24 @@ enum mxs_lradc_ts { MXS_LRADC_TOUCHSCREEN_5WIRE, }; +/* + * Touchscreen handling + */ +enum lradc_ts_plate { + LRADC_TOUCH = 0, + LRADC_SAMPLE_X, + LRADC_SAMPLE_Y, + LRADC_SAMPLE_PRESSURE, + LRADC_SAMPLE_VALID, +}; + struct mxs_lradc { struct device *dev; void __iomem *base; int irq[13]; + struct clk *clk; + uint32_t *buffer; struct iio_trigger *trig; @@ -169,32 +183,63 @@ struct mxs_lradc { #define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2) #define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2) enum mxs_lradc_ts use_touchscreen; - bool stop_touchscreen; bool use_touchbutton; struct input_dev *ts_input; - struct work_struct ts_work; + + enum mxs_lradc_id soc; + enum lradc_ts_plate cur_plate; /* statemachine */ + bool ts_valid; + unsigned ts_x_pos; + unsigned ts_y_pos; + unsigned ts_pressure; + + /* handle touchscreen's physical behaviour */ + /* samples per coordinate */ + unsigned over_sample_cnt; + /* time clocks between samples */ + unsigned over_sample_delay; + /* time in clocks to wait after the plates where switched */ + unsigned settling_delay; }; #define LRADC_CTRL0 0x00 -#define LRADC_CTRL0_TOUCH_DETECT_ENABLE (1 << 23) -#define LRADC_CTRL0_TOUCH_SCREEN_TYPE (1 << 22) -#define LRADC_CTRL0_YNNSW /* YM */ (1 << 21) -#define LRADC_CTRL0_YPNSW /* YP */ (1 << 20) -#define LRADC_CTRL0_YPPSW /* YP */ (1 << 19) -#define LRADC_CTRL0_XNNSW /* XM */ (1 << 18) -#define LRADC_CTRL0_XNPSW /* XM */ (1 << 17) -#define LRADC_CTRL0_XPPSW /* XP */ (1 << 16) -#define LRADC_CTRL0_PLATE_MASK (0x3f << 16) +# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE (1 << 23) +# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE (1 << 22) +# define LRADC_CTRL0_MX28_YNNSW /* YM */ (1 << 21) +# define LRADC_CTRL0_MX28_YPNSW /* YP */ (1 << 20) +# define LRADC_CTRL0_MX28_YPPSW /* YP */ (1 << 19) +# define LRADC_CTRL0_MX28_XNNSW /* XM */ (1 << 18) +# define LRADC_CTRL0_MX28_XNPSW /* XM */ (1 << 17) +# define LRADC_CTRL0_MX28_XPPSW /* XP */ (1 << 16) + +# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE (1 << 20) +# define LRADC_CTRL0_MX23_YM (1 << 19) +# define LRADC_CTRL0_MX23_XM (1 << 18) +# define LRADC_CTRL0_MX23_YP (1 << 17) +# define LRADC_CTRL0_MX23_XP (1 << 16) + +# define LRADC_CTRL0_MX28_PLATE_MASK \ + (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \ + LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \ + LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \ + LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW) + +# define LRADC_CTRL0_MX23_PLATE_MASK \ + (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \ + LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \ + LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP) #define LRADC_CTRL1 0x10 #define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN (1 << 24) #define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16)) -#define LRADC_CTRL1_LRADC_IRQ_EN_MASK (0x1fff << 16) +#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16) +#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16) #define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16 #define LRADC_CTRL1_TOUCH_DETECT_IRQ (1 << 8) #define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n)) -#define LRADC_CTRL1_LRADC_IRQ_MASK 0x1fff +#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff +#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff #define LRADC_CTRL1_LRADC_IRQ_OFFSET 0 #define LRADC_CTRL2 0x20 @@ -207,19 +252,33 @@ struct mxs_lradc { #define LRADC_CH_ACCUMULATE (1 << 29) #define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24) #define LRADC_CH_NUM_SAMPLES_OFFSET 24 +#define LRADC_CH_NUM_SAMPLES(x) \ + ((x) << LRADC_CH_NUM_SAMPLES_OFFSET) #define LRADC_CH_VALUE_MASK 0x3ffff #define LRADC_CH_VALUE_OFFSET 0 #define LRADC_DELAY(n) (0xd0 + (0x10 * (n))) #define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xff << 24) #define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24 +#define LRADC_DELAY_TRIGGER(x) \ + (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \ + LRADC_DELAY_TRIGGER_LRADCS_MASK) #define LRADC_DELAY_KICK (1 << 20) #define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16) #define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16 +#define LRADC_DELAY_TRIGGER_DELAYS(x) \ + (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \ + LRADC_DELAY_TRIGGER_DELAYS_MASK) #define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11) #define LRADC_DELAY_LOOP_COUNT_OFFSET 11 +#define LRADC_DELAY_LOOP(x) \ + (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \ + LRADC_DELAY_LOOP_COUNT_MASK) #define LRADC_DELAY_DELAY_MASK 0x7ff #define LRADC_DELAY_DELAY_OFFSET 0 +#define LRADC_DELAY_DELAY(x) \ + (((x) << LRADC_DELAY_DELAY_OFFSET) & \ + LRADC_DELAY_DELAY_MASK) #define LRADC_CTRL4 0x140 #define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4)) @@ -228,6 +287,475 @@ struct mxs_lradc { #define LRADC_RESOLUTION 12 #define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1) +static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg) +{ + writel(val, lradc->base + reg + STMP_OFFSET_REG_SET); +} + +static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg) +{ + writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR); +} + +static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg) +{ + writel(val, lradc->base + reg); +} + +static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL0_MX23_PLATE_MASK; + else + return LRADC_CTRL0_MX28_PLATE_MASK; +} + +static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK; + else + return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK; +} + +static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL1_MX23_LRADC_IRQ_MASK; + else + return LRADC_CTRL1_MX28_LRADC_IRQ_MASK; +} + +static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE; + else + return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE; +} + +static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM; + else + return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW; +} + +static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM; + else + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW; +} + +static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc) +{ + if (lradc->soc == IMX23_LRADC) + return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM; + else + return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW; +} + +static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc) +{ + return !!(readl(lradc->base + LRADC_STATUS) & + LRADC_STATUS_TOUCH_DETECT_RAW); +} + +static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch) +{ + /* + * prepare for oversampling conversion + * + * from the datasheet: + * "The ACCUMULATE bit in the appropriate channel register + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; + * otherwise, the IRQs will not fire." + */ + mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE | + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1), + LRADC_CH(ch)); + + /* from the datasheet: + * "Software must clear this register in preparation for a + * multi-cycle accumulation. + */ + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch)); + + /* prepare the delay/loop unit according to the oversampling count */ + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) | + LRADC_DELAY_TRIGGER_DELAYS(0) | + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) | + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1), + LRADC_DELAY(3)); + + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(2) | + LRADC_CTRL1_LRADC_IRQ(3) | LRADC_CTRL1_LRADC_IRQ(4) | + LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); + + /* wake us again, when the complete conversion is done */ + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(ch), LRADC_CTRL1); + /* + * after changing the touchscreen plates setting + * the signals need some initial time to settle. Start the + * SoC's delay unit and start the conversion later + * and automatically. + */ + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */ + LRADC_DELAY_TRIGGER_DELAYS(1 << 3) | /* trigger DELAY unit#3 */ + LRADC_DELAY_KICK | + LRADC_DELAY_DELAY(lradc->settling_delay), + LRADC_DELAY(2)); +} + +/* + * Pressure detection is special: + * We want to do both required measurements for the pressure detection in + * one turn. Use the hardware features to chain both conversions and let the + * hardware report one interrupt if both conversions are done + */ +static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1, + unsigned ch2) +{ + u32 reg; + + /* + * prepare for oversampling conversion + * + * from the datasheet: + * "The ACCUMULATE bit in the appropriate channel register + * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0; + * otherwise, the IRQs will not fire." + */ + reg = LRADC_CH_ACCUMULATE | + LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1); + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1)); + mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2)); + + /* from the datasheet: + * "Software must clear this register in preparation for a + * multi-cycle accumulation. + */ + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1)); + mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2)); + + /* prepare the delay/loop unit according to the oversampling count */ + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch1) | + LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */ + LRADC_DELAY_TRIGGER_DELAYS(0) | + LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) | + LRADC_DELAY_DELAY(lradc->over_sample_delay - 1), + LRADC_DELAY(3)); + + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(2) | + LRADC_CTRL1_LRADC_IRQ(3) | LRADC_CTRL1_LRADC_IRQ(4) | + LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); + + /* wake us again, when the conversions are done */ + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(ch2), LRADC_CTRL1); + /* + * after changing the touchscreen plates setting + * the signals need some initial time to settle. Start the + * SoC's delay unit and start the conversion later + * and automatically. + */ + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */ + LRADC_DELAY_TRIGGER_DELAYS(1 << 3) | /* trigger DELAY unit#3 */ + LRADC_DELAY_KICK | + LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2)); +} + +static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc, + unsigned channel) +{ + u32 reg; + unsigned num_samples, val; + + reg = readl(lradc->base + LRADC_CH(channel)); + if (reg & LRADC_CH_ACCUMULATE) + num_samples = lradc->over_sample_cnt; + else + num_samples = 1; + + val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET; + return val / num_samples; +} + +static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc, + unsigned ch1, unsigned ch2) +{ + u32 reg, mask; + unsigned pressure, m1, m2; + + mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2); + reg = readl(lradc->base + LRADC_CTRL1) & mask; + + while (reg != mask) { + reg = readl(lradc->base + LRADC_CTRL1) & mask; + dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg); + } + + m1 = mxs_lradc_read_raw_channel(lradc, ch1); + m2 = mxs_lradc_read_raw_channel(lradc, ch2); + + if (m2 == 0) { + dev_warn(lradc->dev, "Cannot calculate pressure\n"); + return 1 << (LRADC_RESOLUTION - 1); + } + + /* simply scale the value from 0 ... max ADC resolution */ + pressure = m1; + pressure *= (1 << LRADC_RESOLUTION); + pressure /= m2; + + dev_dbg(lradc->dev, "Pressure = %u\n", pressure); + return pressure; +} + +#define TS_CH_XP 2 +#define TS_CH_YP 3 +#define TS_CH_XM 4 +#define TS_CH_YM 5 + +static int mxs_lradc_read_ts_channel(struct mxs_lradc *lradc) +{ + u32 reg; + int val; + + reg = readl(lradc->base + LRADC_CTRL1); + + /* only channels 3 to 5 are of interest here */ + if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_YP)) { + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_YP) | + LRADC_CTRL1_LRADC_IRQ(TS_CH_YP), LRADC_CTRL1); + val = mxs_lradc_read_raw_channel(lradc, TS_CH_YP); + } else if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_XM)) { + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_XM) | + LRADC_CTRL1_LRADC_IRQ(TS_CH_XM), LRADC_CTRL1); + val = mxs_lradc_read_raw_channel(lradc, TS_CH_XM); + } else if (reg & LRADC_CTRL1_LRADC_IRQ(TS_CH_YM)) { + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(TS_CH_YM) | + LRADC_CTRL1_LRADC_IRQ(TS_CH_YM), LRADC_CTRL1); + val = mxs_lradc_read_raw_channel(lradc, TS_CH_YM); + } else { + return -EIO; + } + + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3)); + + return val; +} + +/* + * YP(open)--+-------------+ + * | |--+ + * | | | + * YM(-)--+-------------+ | + * +--------------+ + * | | + * XP(weak+) XM(open) + * + * "weak+" means 200k Ohm VDDIO + * (-) means GND + */ +static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc) +{ + /* + * In order to detect a touch event the 'touch detect enable' bit + * enables: + * - a weak pullup to the X+ connector + * - a strong ground at the Y- connector + */ + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); + mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc), + LRADC_CTRL0); +} + +/* + * YP(meas)--+-------------+ + * | |--+ + * | | | + * YM(open)--+-------------+ | + * +--------------+ + * | | + * XP(+) XM(-) + * + * (+) means here 1.85 V + * (-) means here GND + */ +static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc) +{ + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); + mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0); + + lradc->cur_plate = LRADC_SAMPLE_X; + mxs_lradc_setup_ts_channel(lradc, TS_CH_YP); +} + +/* + * YP(+)--+-------------+ + * | |--+ + * | | | + * YM(-)--+-------------+ | + * +--------------+ + * | | + * XP(open) XM(meas) + * + * (+) means here 1.85 V + * (-) means here GND + */ +static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc) +{ + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); + mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0); + + lradc->cur_plate = LRADC_SAMPLE_Y; + mxs_lradc_setup_ts_channel(lradc, TS_CH_XM); +} + +/* + * YP(+)--+-------------+ + * | |--+ + * | | | + * YM(meas)--+-------------+ | + * +--------------+ + * | | + * XP(meas) XM(-) + * + * (+) means here 1.85 V + * (-) means here GND + */ +static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc) +{ + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); + mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0); + + lradc->cur_plate = LRADC_SAMPLE_PRESSURE; + mxs_lradc_setup_ts_pressure(lradc, TS_CH_XP, TS_CH_YM); +} + +static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc) +{ + mxs_lradc_setup_touch_detection(lradc); + + lradc->cur_plate = LRADC_TOUCH; + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ | + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); +} + +static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc) +{ + input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos); + input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos); + input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure); + input_report_key(lradc->ts_input, BTN_TOUCH, 1); + input_sync(lradc->ts_input); +} + +static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc) +{ + mxs_lradc_setup_touch_detection(lradc); + lradc->cur_plate = LRADC_SAMPLE_VALID; + /* + * start a dummy conversion to burn time to settle the signals + * note: we are not interested in the conversion's value + */ + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(5)); + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(5), LRADC_CTRL1); + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(5), LRADC_CTRL1); + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << 5) | + LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */ + LRADC_DELAY(2)); +} + +/* + * in order to avoid false measurements, report only samples where + * the surface is still touched after the position measurement + */ +static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid) +{ + /* if it is still touched, report the sample */ + if (valid && mxs_lradc_check_touch_event(lradc)) { + lradc->ts_valid = true; + mxs_lradc_report_ts_event(lradc); + } + + /* if it is even still touched, continue with the next measurement */ + if (mxs_lradc_check_touch_event(lradc)) { + mxs_lradc_prepare_y_pos(lradc); + return; + } + + if (lradc->ts_valid) { + /* signal the release */ + lradc->ts_valid = false; + input_report_key(lradc->ts_input, BTN_TOUCH, 0); + input_sync(lradc->ts_input); + } + + /* if it is released, wait for the next touch via IRQ */ + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ, LRADC_CTRL1); + mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1); +} + +/* touchscreen's state machine */ +static void mxs_lradc_handle_touch(struct mxs_lradc *lradc) +{ + int val; + + switch (lradc->cur_plate) { + case LRADC_TOUCH: + /* + * start with the Y-pos, because it uses nearly the same plate + * settings like the touch detection + */ + if (mxs_lradc_check_touch_event(lradc)) { + mxs_lradc_reg_clear(lradc, + LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, + LRADC_CTRL1); + mxs_lradc_prepare_y_pos(lradc); + } + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ, + LRADC_CTRL1); + return; + + case LRADC_SAMPLE_Y: + val = mxs_lradc_read_ts_channel(lradc); + if (val < 0) { + mxs_lradc_enable_touch_detection(lradc); /* re-start */ + return; + } + lradc->ts_y_pos = val; + mxs_lradc_prepare_x_pos(lradc); + return; + + case LRADC_SAMPLE_X: + val = mxs_lradc_read_ts_channel(lradc); + if (val < 0) { + mxs_lradc_enable_touch_detection(lradc); /* re-start */ + return; + } + lradc->ts_x_pos = val; + mxs_lradc_prepare_pressure(lradc); + return; + + case LRADC_SAMPLE_PRESSURE: + lradc->ts_pressure = + mxs_lradc_read_ts_pressure(lradc, TS_CH_XP, TS_CH_YM); + mxs_lradc_complete_touch_event(lradc); + return; + + case LRADC_SAMPLE_VALID: + val = mxs_lradc_read_ts_channel(lradc); /* ignore the value */ + mxs_lradc_finish_touch_event(lradc, 1); + break; + } +} + /* * Raw I/O operations */ @@ -262,21 +790,20 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev, * Virtual channel 0 is always used here as the others are always not * used if doing raw sampling. */ - writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); - writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); + if (lradc->soc == IMX28_LRADC) + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, + LRADC_CTRL1); + mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); /* Clean the slot's previous content, then set new one. */ - writel(LRADC_CTRL4_LRADCSELECT_MASK(0), - lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); - writel(chan->channel, lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); + mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0), LRADC_CTRL4); + mxs_lradc_reg_set(lradc, chan->channel, LRADC_CTRL4); - writel(0, lradc->base + LRADC_CH(0)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0)); /* Enable the IRQ and start sampling the channel. */ - writel(LRADC_CTRL1_LRADC_IRQ_EN(0), - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); - writel(1 << 0, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); + mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1); + mxs_lradc_reg_set(lradc, 1 << 0, LRADC_CTRL0); /* Wait for completion on the channel, 1 second max. */ ret = wait_for_completion_killable_timeout(&lradc->completion, HZ); @@ -290,8 +817,7 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev, ret = IIO_VAL_INT; err: - writel(LRADC_CTRL1_LRADC_IRQ_EN(0), - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1); mutex_unlock(&lradc->lock); @@ -303,220 +829,33 @@ static const struct iio_info mxs_lradc_iio_info = { .read_raw = mxs_lradc_read_raw, }; -/* - * Touchscreen handling - */ -enum lradc_ts_plate { - LRADC_SAMPLE_X, - LRADC_SAMPLE_Y, - LRADC_SAMPLE_PRESSURE, -}; - -static int mxs_lradc_ts_touched(struct mxs_lradc *lradc) -{ - uint32_t reg; - - /* Enable touch detection. */ - writel(LRADC_CTRL0_PLATE_MASK, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); - writel(LRADC_CTRL0_TOUCH_DETECT_ENABLE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); - - msleep(LRADC_TS_SAMPLE_DELAY_MS); - - reg = readl(lradc->base + LRADC_STATUS); - - return reg & LRADC_STATUS_TOUCH_DETECT_RAW; -} - -static int32_t mxs_lradc_ts_sample(struct mxs_lradc *lradc, - enum lradc_ts_plate plate, int change) -{ - unsigned long delay, jiff; - uint32_t reg, ctrl0 = 0, chan = 0; - /* The touchscreen always uses CTRL4 slot #7. */ - const uint8_t slot = 7; - uint32_t val; - - /* - * There are three correct configurations of the controller sampling - * the touchscreen, each of these configuration provides different - * information from the touchscreen. - * - * The following table describes the sampling configurations: - * +-------------+-------+-------+-------+ - * | Wire \ Axis | X | Y | Z | - * +---------------------+-------+-------+ - * | X+ (CH2) | HI | TS | TS | - * +-------------+-------+-------+-------+ - * | X- (CH4) | LO | SH | HI | - * +-------------+-------+-------+-------+ - * | Y+ (CH3) | SH | HI | HI | - * +-------------+-------+-------+-------+ - * | Y- (CH5) | TS | LO | SH | - * +-------------+-------+-------+-------+ - * - * HI ... strong '1' ; LO ... strong '0' - * SH ... sample here ; TS ... tri-state - * - * There are a few other ways of obtaining the Z coordinate - * (aka. pressure), but the one in the table seems to be the - * most reliable one. - */ - switch (plate) { - case LRADC_SAMPLE_X: - ctrl0 = LRADC_CTRL0_XPPSW | LRADC_CTRL0_XNNSW; - chan = 3; - break; - case LRADC_SAMPLE_Y: - ctrl0 = LRADC_CTRL0_YPPSW | LRADC_CTRL0_YNNSW; - chan = 4; - break; - case LRADC_SAMPLE_PRESSURE: - ctrl0 = LRADC_CTRL0_YPPSW | LRADC_CTRL0_XNNSW; - chan = 5; - break; - } - - if (change) { - writel(LRADC_CTRL0_PLATE_MASK, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); - writel(ctrl0, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); - - writel(LRADC_CTRL4_LRADCSELECT_MASK(slot), - lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); - writel(chan << LRADC_CTRL4_LRADCSELECT_OFFSET(slot), - lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); - } - - writel(0xffffffff, lradc->base + LRADC_CH(slot) + STMP_OFFSET_REG_CLR); - writel(1 << slot, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); - - delay = jiffies + msecs_to_jiffies(LRADC_TS_SAMPLE_DELAY_MS); - do { - jiff = jiffies; - reg = readl_relaxed(lradc->base + LRADC_CTRL1); - if (reg & LRADC_CTRL1_LRADC_IRQ(slot)) - break; - } while (time_before(jiff, delay)); - - writel(LRADC_CTRL1_LRADC_IRQ(slot), - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); - - if (time_after_eq(jiff, delay)) - return -ETIMEDOUT; - - val = readl(lradc->base + LRADC_CH(slot)); - val &= LRADC_CH_VALUE_MASK; - - return val; -} - -static int32_t mxs_lradc_ts_sample_filter(struct mxs_lradc *lradc, - enum lradc_ts_plate plate) -{ - int32_t val, tot = 0; - int i; - - val = mxs_lradc_ts_sample(lradc, plate, 1); - - /* Delay a bit so the touchscreen is stable. */ - mdelay(2); - - for (i = 0; i < LRADC_TS_SAMPLE_AMOUNT; i++) { - val = mxs_lradc_ts_sample(lradc, plate, 0); - tot += val; - } - - return tot / LRADC_TS_SAMPLE_AMOUNT; -} - -static void mxs_lradc_ts_work(struct work_struct *ts_work) -{ - struct mxs_lradc *lradc = container_of(ts_work, - struct mxs_lradc, ts_work); - int val_x, val_y, val_p; - bool valid = false; - - while (mxs_lradc_ts_touched(lradc)) { - /* Disable touch detector so we can sample the touchscreen. */ - writel(LRADC_CTRL0_TOUCH_DETECT_ENABLE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); - - if (likely(valid)) { - input_report_abs(lradc->ts_input, ABS_X, val_x); - input_report_abs(lradc->ts_input, ABS_Y, val_y); - input_report_abs(lradc->ts_input, ABS_PRESSURE, val_p); - input_report_key(lradc->ts_input, BTN_TOUCH, 1); - input_sync(lradc->ts_input); - } - - valid = false; - - val_x = mxs_lradc_ts_sample_filter(lradc, LRADC_SAMPLE_X); - if (val_x < 0) - continue; - val_y = mxs_lradc_ts_sample_filter(lradc, LRADC_SAMPLE_Y); - if (val_y < 0) - continue; - val_p = mxs_lradc_ts_sample_filter(lradc, LRADC_SAMPLE_PRESSURE); - if (val_p < 0) - continue; - - valid = true; - } - - input_report_abs(lradc->ts_input, ABS_PRESSURE, 0); - input_report_key(lradc->ts_input, BTN_TOUCH, 0); - input_sync(lradc->ts_input); - - /* Do not restart the TS IRQ if the driver is shutting down. */ - if (lradc->stop_touchscreen) - return; - - /* Restart the touchscreen interrupts. */ - writel(LRADC_CTRL1_TOUCH_DETECT_IRQ, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); - writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); -} - static int mxs_lradc_ts_open(struct input_dev *dev) { struct mxs_lradc *lradc = input_get_drvdata(dev); - /* The touchscreen is starting. */ - lradc->stop_touchscreen = false; - /* Enable the touch-detect circuitry. */ - writel(LRADC_CTRL0_TOUCH_DETECT_ENABLE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); - - /* Enable the touch-detect IRQ. */ - writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); + mxs_lradc_enable_touch_detection(lradc); return 0; } -static void mxs_lradc_ts_close(struct input_dev *dev) +static void mxs_lradc_disable_ts(struct mxs_lradc *lradc) { - struct mxs_lradc *lradc = input_get_drvdata(dev); + /* stop all interrupts from firing */ + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN | + LRADC_CTRL1_LRADC_IRQ_EN(2) | LRADC_CTRL1_LRADC_IRQ_EN(3) | + LRADC_CTRL1_LRADC_IRQ_EN(4) | LRADC_CTRL1_LRADC_IRQ_EN(5), + LRADC_CTRL1); - /* Indicate the touchscreen is stopping. */ - lradc->stop_touchscreen = true; - mb(); - - /* Wait until touchscreen thread finishes any possible remnants. */ - cancel_work_sync(&lradc->ts_work); + /* Power-down touchscreen touch-detect circuitry. */ + mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0); +} - /* Disable touchscreen touch-detect IRQ. */ - writel(LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); +static void mxs_lradc_ts_close(struct input_dev *dev) +{ + struct mxs_lradc *lradc = input_get_drvdata(dev); - /* Power-down touchscreen touch-detect circuitry. */ - writel(LRADC_CTRL0_TOUCH_DETECT_ENABLE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); + mxs_lradc_disable_ts(lradc); } static int mxs_lradc_ts_register(struct mxs_lradc *lradc) @@ -529,10 +868,8 @@ static int mxs_lradc_ts_register(struct mxs_lradc *lradc) return 0; input = input_allocate_device(); - if (!input) { - dev_err(dev, "Failed to allocate TS device!\n"); + if (!input) return -ENOMEM; - } input->name = DRIVER_NAME; input->id.bustype = BUS_HOST; @@ -562,8 +899,7 @@ static void mxs_lradc_ts_unregister(struct mxs_lradc *lradc) if (!lradc->use_touchscreen) return; - cancel_work_sync(&lradc->ts_work); - + mxs_lradc_disable_ts(lradc); input_unregister_device(lradc->ts_input); } @@ -576,31 +912,24 @@ static irqreturn_t mxs_lradc_handle_irq(int irq, void *data) struct mxs_lradc *lradc = iio_priv(iio); unsigned long reg = readl(lradc->base + LRADC_CTRL1); const uint32_t ts_irq_mask = - LRADC_CTRL1_TOUCH_DETECT_IRQ_EN | - LRADC_CTRL1_TOUCH_DETECT_IRQ; + LRADC_CTRL1_TOUCH_DETECT_IRQ | + LRADC_CTRL1_LRADC_IRQ(2) | + LRADC_CTRL1_LRADC_IRQ(3) | + LRADC_CTRL1_LRADC_IRQ(4) | + LRADC_CTRL1_LRADC_IRQ(5); - if (!(reg & LRADC_CTRL1_LRADC_IRQ_MASK)) + if (!(reg & mxs_lradc_irq_mask(lradc))) return IRQ_NONE; - /* - * Touchscreen IRQ handling code has priority and therefore - * is placed here. In case touchscreen IRQ arrives, disable - * it ASAP - */ - if (reg & LRADC_CTRL1_TOUCH_DETECT_IRQ) { - writel(ts_irq_mask, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); - if (!lradc->stop_touchscreen) - schedule_work(&lradc->ts_work); - } + if (lradc->use_touchscreen && (reg & ts_irq_mask)) + mxs_lradc_handle_touch(lradc); if (iio_buffer_enabled(iio)) iio_trigger_poll(iio->trig, iio_get_time_ns()); else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) complete(&lradc->completion); - writel(reg & LRADC_CTRL1_LRADC_IRQ_MASK, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); + mxs_lradc_reg_clear(lradc, reg & mxs_lradc_irq_mask(lradc), LRADC_CTRL1); return IRQ_HANDLED; } @@ -619,19 +948,13 @@ static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p) for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { lradc->buffer[j] = readl(lradc->base + LRADC_CH(j)); - writel(chan_value, lradc->base + LRADC_CH(j)); + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j)); lradc->buffer[j] &= LRADC_CH_VALUE_MASK; lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP; j++; } - if (iio->scan_timestamp) { - s64 *timestamp = (s64 *)((u8 *)lradc->buffer + - ALIGN(j, sizeof(s64))); - *timestamp = pf->timestamp; - } - - iio_push_to_buffers(iio, (u8 *)lradc->buffer); + iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp); iio_trigger_notify_done(iio->trig); @@ -644,7 +967,7 @@ static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state) struct mxs_lradc *lradc = iio_priv(iio); const uint32_t st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR; - writel(LRADC_DELAY_KICK, lradc->base + LRADC_DELAY(0) + st); + mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st); return 0; } @@ -716,38 +1039,30 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio) goto err_mem; } - ret = iio_sw_buffer_preenable(iio); - if (ret < 0) - goto err_buf; - - writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); - writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); + if (lradc->soc == IMX28_LRADC) + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, + LRADC_CTRL1); + mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) { ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs); ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs); ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs); - writel(chan_value, lradc->base + LRADC_CH(ofs)); + mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs)); bitmap_set(&enable, ofs, 1); ofs++; } - writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, - lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); - - writel(ctrl4_clr, lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); - writel(ctrl4_set, lradc->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); - - writel(ctrl1_irq, lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); - - writel(enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, - lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_SET); + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK | + LRADC_DELAY_KICK, LRADC_DELAY(0)); + mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4); + mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4); + mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1); + mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET, + LRADC_DELAY(0)); return 0; -err_buf: - kfree(lradc->buffer); err_mem: mutex_unlock(&lradc->lock); return ret; @@ -757,12 +1072,13 @@ static int mxs_lradc_buffer_postdisable(struct iio_dev *iio) { struct mxs_lradc *lradc = iio_priv(iio); - writel(LRADC_DELAY_TRIGGER_LRADCS_MASK | LRADC_DELAY_KICK, - lradc->base + LRADC_DELAY(0) + STMP_OFFSET_REG_CLR); + mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK | + LRADC_DELAY_KICK, LRADC_DELAY(0)); - writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); - writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); + mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0); + if (lradc->soc == IMX28_LRADC) + mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK, + LRADC_CTRL1); kfree(lradc->buffer); mutex_unlock(&lradc->lock); @@ -857,24 +1173,25 @@ static int mxs_lradc_hw_init(struct mxs_lradc *lradc) return ret; /* Configure DELAY CHANNEL 0 for generic ADC sampling. */ - writel(adc_cfg, lradc->base + LRADC_DELAY(0)); + mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0)); /* Disable remaining DELAY CHANNELs */ - writel(0, lradc->base + LRADC_DELAY(1)); - writel(0, lradc->base + LRADC_DELAY(2)); - writel(0, lradc->base + LRADC_DELAY(3)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3)); /* Configure the touchscreen type */ - writel(LRADC_CTRL0_TOUCH_SCREEN_TYPE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); + if (lradc->soc == IMX28_LRADC) { + mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, + LRADC_CTRL0); - if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE) { - writel(LRADC_CTRL0_TOUCH_SCREEN_TYPE, - lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); + if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE) + mxs_lradc_reg_set(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE, + LRADC_CTRL0); } /* Start internal temperature sensing. */ - writel(0, lradc->base + LRADC_CTRL2); + mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2); return 0; } @@ -883,11 +1200,10 @@ static void mxs_lradc_hw_stop(struct mxs_lradc *lradc) { int i; - writel(LRADC_CTRL1_LRADC_IRQ_EN_MASK, - lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); + mxs_lradc_reg_clear(lradc, mxs_lradc_irq_en_mask(lradc), LRADC_CTRL1); for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++) - writel(0, lradc->base + LRADC_DELAY(i)); + mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i)); } static const struct of_device_id mxs_lradc_dt_ids[] = { @@ -897,6 +1213,52 @@ static const struct of_device_id mxs_lradc_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids); +static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc, + struct device_node *lradc_node) +{ + int ret; + u32 ts_wires = 0, adapt; + + ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires", + &ts_wires); + if (ret) + return -ENODEV; /* touchscreen feature disabled */ + + switch (ts_wires) { + case 4: + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE; + break; + case 5: + if (lradc->soc == IMX28_LRADC) { + lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE; + break; + } + /* fall through an error message for i.MX23 */ + default: + dev_err(lradc->dev, + "Unsupported number of touchscreen wires (%d)\n", + ts_wires); + return -EINVAL; + } + + lradc->over_sample_cnt = 4; + ret = of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt); + if (ret == 0) + lradc->over_sample_cnt = adapt; + + lradc->over_sample_delay = 2; + ret = of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt); + if (ret == 0) + lradc->over_sample_delay = adapt; + + lradc->settling_delay = 10; + ret = of_property_read_u32(lradc_node, "fsl,settling", &adapt); + if (ret == 0) + lradc->settling_delay = adapt; + + return 0; +} + static int mxs_lradc_probe(struct platform_device *pdev) { const struct of_device_id *of_id = @@ -908,8 +1270,7 @@ static int mxs_lradc_probe(struct platform_device *pdev) struct mxs_lradc *lradc; struct iio_dev *iio; struct resource *iores; - uint32_t ts_wires = 0; - int ret = 0; + int ret = 0, touch_ret; int i; /* Allocate the IIO device. */ @@ -920,6 +1281,7 @@ static int mxs_lradc_probe(struct platform_device *pdev) } lradc = iio_priv(iio); + lradc->soc = (enum mxs_lradc_id)of_id->data; /* Grab the memory area */ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -928,20 +1290,18 @@ static int mxs_lradc_probe(struct platform_device *pdev) if (IS_ERR(lradc->base)) return PTR_ERR(lradc->base); - INIT_WORK(&lradc->ts_work, mxs_lradc_ts_work); + 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 != 0) { + dev_err(dev, "Failed to enable the delay unit clock\n"); + return ret; + } - /* Check if touchscreen is enabled in DT. */ - ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", - &ts_wires); - if (ret) - dev_info(dev, "Touchscreen not enabled.\n"); - else if (ts_wires == 4) - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE; - else if (ts_wires == 5) - lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE; - else - dev_warn(dev, "Unsupported number of touchscreen wires (%d)\n", - ts_wires); + touch_ret = mxs_lradc_probe_touchscreen(lradc, node); /* Grab all IRQ sources */ for (i = 0; i < of_cfg->irq_count; i++) { @@ -985,9 +1345,11 @@ static int mxs_lradc_probe(struct platform_device *pdev) goto err_dev; /* Register the touchscreen input device. */ - ret = mxs_lradc_ts_register(lradc); - if (ret) - goto err_dev; + if (touch_ret == 0) { + ret = mxs_lradc_ts_register(lradc); + if (ret) + goto err_ts_register; + } /* Register IIO device. */ ret = iio_device_register(iio); @@ -1000,6 +1362,8 @@ static int mxs_lradc_probe(struct platform_device *pdev) err_ts: mxs_lradc_ts_unregister(lradc); +err_ts_register: + mxs_lradc_hw_stop(lradc); err_dev: mxs_lradc_trigger_remove(iio); err_trig: @@ -1012,14 +1376,13 @@ static int mxs_lradc_remove(struct platform_device *pdev) struct iio_dev *iio = platform_get_drvdata(pdev); struct mxs_lradc *lradc = iio_priv(iio); + iio_device_unregister(iio); mxs_lradc_ts_unregister(lradc); - mxs_lradc_hw_stop(lradc); - - iio_device_unregister(iio); - iio_triggered_buffer_cleanup(iio); mxs_lradc_trigger_remove(iio); + iio_triggered_buffer_cleanup(iio); + clk_disable_unprepare(lradc->clk); return 0; } @@ -1038,3 +1401,4 @@ module_platform_driver(mxs_lradc_driver); MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); MODULE_DESCRIPTION("Freescale i.MX28 LRADC driver"); MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); |