- struct ads7846 *ts;
- struct ads7846_packet *packet;
- struct input_dev *input_dev;
- const struct ads7846_platform_data *pdata = spi->dev.platform_data;
- struct spi_message *m;
- struct spi_transfer *x;
- unsigned long irq_flags;
- int vref;
- int err;
-
- if (!spi->irq) {
- dev_dbg(&spi->dev, "no IRQ?\n");
- return -ENODEV;
- }
-
- if (!pdata) {
- dev_dbg(&spi->dev, "no platform data?\n");
- return -ENODEV;
- }
-
- /* don't exceed max specified sample rate */
- if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
- dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
- (spi->max_speed_hz/SAMPLE_BITS)/1000);
- return -EINVAL;
- }
-
- /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
- * that even if the hardware can do that, the SPI controller driver
- * may not. So we stick to very-portable 8 bit words, both RX and TX.
- */
- spi->bits_per_word = 8;
- spi->mode = SPI_MODE_0;
- err = spi_setup(spi);
- if (err < 0)
- return err;
-
- ts = kzalloc(sizeof(struct ads7846), GFP_KERNEL);
- packet = kzalloc(sizeof(struct ads7846_packet), GFP_KERNEL);
- input_dev = input_allocate_device();
- if (!ts || !packet || !input_dev) {
- err = -ENOMEM;
- goto err_free_mem;
- }
-
- dev_set_drvdata(&spi->dev, ts);
-
- ts->packet = packet;
- ts->spi = spi;
- ts->input = input_dev;
- ts->vref_mv = pdata->vref_mv;
- ts->swap_xy = pdata->swap_xy;
-
- hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- ts->timer.function = ads7846_timer;
-
- spin_lock_init(&ts->lock);
-
- ts->model = pdata->model ? : 7846;
- ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
- ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
- ts->pressure_max = pdata->pressure_max ? : ~0;
-
- if (pdata->filter != NULL) {
- if (pdata->filter_init != NULL) {
- err = pdata->filter_init(pdata, &ts->filter_data);
- if (err < 0)
- goto err_free_mem;
- }
- ts->filter = pdata->filter;
- ts->filter_cleanup = pdata->filter_cleanup;
- } else if (pdata->debounce_max) {
- ts->debounce_max = pdata->debounce_max;
- if (ts->debounce_max < 2)
- ts->debounce_max = 2;
- ts->debounce_tol = pdata->debounce_tol;
- ts->debounce_rep = pdata->debounce_rep;
- ts->filter = ads7846_debounce;
- ts->filter_data = ts;
- } else
- ts->filter = ads7846_no_filter;
-
- err = setup_pendown(spi, ts);
- if (err)
- goto err_cleanup_filter;
-
- if (pdata->penirq_recheck_delay_usecs)
- ts->penirq_recheck_delay_usecs =
- pdata->penirq_recheck_delay_usecs;
-
- ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
-
- snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
- snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model);
-
- input_dev->name = ts->name;
- input_dev->phys = ts->phys;
- input_dev->dev.parent = &spi->dev;
-
- input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
- input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
- input_set_abs_params(input_dev, ABS_X,
- pdata->x_min ? : 0,
- pdata->x_max ? : MAX_12BIT,
- 0, 0);
- input_set_abs_params(input_dev, ABS_Y,
- pdata->y_min ? : 0,
- pdata->y_max ? : MAX_12BIT,
- 0, 0);
- input_set_abs_params(input_dev, ABS_PRESSURE,
- pdata->pressure_min, pdata->pressure_max, 0, 0);
-
- vref = pdata->keep_vref_on;