+/*
+ * tsc210x.c - TSC2101/2102/... driver core
+ *
+ * Copyright (c) 2005-2007 Andrzej Zaborowski <balrog@zabor.org>
+ *
+ * This package 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 package 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this package; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/suspend.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/autoconf.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/tsc210x.h>
+
+
+/* NOTE: It should be straightforward to make this driver framework handle
+ * tsc2100 and tsc2111 chips, and maybe others too. The main differences
+ * are in the audio codec capabilities, but there are also some differences
+ * in how the various sensors (including touchscreen) are handled.
+ */
+
+/* Bit field definitions for chip registers */
+
+/* Scan X, Y, Z1, Z2, chip controlled, 12-bit, 16 samples, 500 usec */
+#define TSC210X_ADC_TS_CONTROL 0x8bf4
+/* Scan BAT1, BAT2, AUX1, AUX2, 12-bit, 16 samples, 500 usec */
+#define TSC210X_ADC_SCAN_CONTROL 0x2ff4
+/* Scan TEMP1, 12-bit, 16 samples, 500 usec */
+#define TSC210X_ADC_T1_CONTROL 0x2bf4
+/* Scan TEMP2, 12-bit, 16 samples, 500 usec */
+#define TSC210X_ADC_T2_CONTROL 0x33f4
+/* PINT/DAV acts as DAV */
+#define TSC210X_ADC_DAV 0x4000
+/* Internal reference, 100 usec delay, 1.25 V reference */
+#define TSC210X_ADC_INT_REF 0x0016
+/* External reference, 100 usec delay, 1.25 V reference */
+#define TSC210X_ADC_EXT_REF 0x0002
+/* 84 usec precharge time, 32 usec sense time */
+#define TSC210X_CONFIG_TIMES 0x0008
+/* The reset sequence */
+#define TSC210X_RESET 0xbb00
+/* Pen Status bit */
+#define TSC210X_ADC_PSTCM (1 << 15)
+/* A/D Status bit */
+#define TSC210X_ADC_ADST (1 << 14)
+/* (At least) One of X, Y, Z1, Z2 contains data */
+#define TSC210X_TS_DAV 0x0780
+/* (At least) One of BAT1, BAT2, AUX1, AUX2 contains data */
+#define TSC210X_PS_DAV 0x0078
+/* TEMP1 contains data */
+#define TSC210X_T1_DAV 0x0004
+/* TEMP2 contains data */
+#define TSC210X_T2_DAV 0x0002
+#define TSC2101_DAC_ON 0x0000
+#define TSC2101_DAC_OFF 0xe7fc
+#define TSC2102_DAC_ON 0x3ba0
+#define TSC2102_DAC_OFF 0xafa0
+#define TSC210X_FS44K (1 << 13)
+#define TSC210X_PLL1_OFF 0x0000
+#define TSC210X_PLL1_44K 0x811c
+#define TSC210X_PLL1_48K 0x8120
+#define TSC210X_PLL2_44K (5462 << 2)
+#define TSC210X_PLL2_48K (1920 << 2)
+#define TSC210X_SLVMS (1 << 11)
+#define TSC210X_DEEMPF (1 << 0)
+#define TSC2102_BASSBC (1 << 1)
+#define TSC210X_KEYCLICK_OFF 0x0000
+
+#define CS_CHANGE(val) 0
+
+struct tsc210x_spi_req {
+ struct spi_device *dev;
+ u16 command;
+ u16 data;
+ struct spi_message message;
+};
+
+struct tsc210x_dev {
+ enum tsc_type {
+ tsc2101,
+ tsc2102,
+ } kind;
+ struct tsc210x_config *pdata;
+ struct clk *bclk_ck;
+
+ struct workqueue_struct *queue;
+ struct delayed_work ts_worker; /* Poll-wait for PEN UP */
+ struct delayed_work sensor_worker; /* Scan the ADC inputs */
+ struct mutex queue_lock;
+ struct completion data_avail;
+
+ tsc210x_touch_t touch_cb;
+ void *touch_cb_ctx;
+
+ tsc210x_coords_t coords_cb;
+ void *coords_cb_ctx;
+
+ tsc210x_ports_t ports_cb;
+ void *ports_cb_ctx;
+
+ tsc210x_temp_t temp1_cb;
+ void *temp2_cb_ctx;
+
+ tsc210x_temp_t temp2_cb;
+ void *temp1_cb_ctx;
+
+ struct spi_device *spi;
+ struct spi_transfer *transfers;
+ struct tsc210x_spi_req req_adc;
+ struct tsc210x_spi_req req_status;
+ struct tsc210x_spi_req req_mode;
+ struct tsc210x_spi_req req_stop;
+
+ int pendown;
+ int flushing; /* Queue flush in progress */
+ u16 status;
+ u16 adc_data[4];
+ int bat[2], aux[2], temp[2];
+};
+
+static struct {
+ unsigned int ts_msecs; /* Interval for .ts_timer */
+ unsigned int mode_msecs; /* Interval for .mode_timer */
+} settings;
+
+module_param_named(touch_check_msecs, settings.ts_msecs, uint, 0);
+MODULE_PARM_DESC(touch_check_msecs, "Pen-up polling interval in msecs");
+
+module_param_named(sensor_scan_msecs, settings.mode_msecs, uint, 0);
+MODULE_PARM_DESC(sensor_scan_msecs, "Temperature & battery scan interval");
+
+int tsc210x_write_sync(struct tsc210x_dev *dev,
+ int page, u8 address, u16 data)
+{
+ static struct tsc210x_spi_req req;
+ static struct spi_transfer transfer[2];
+ int ret;
+
+ spi_message_init(&req.message);
+
+ /* Address */
+ req.command = (page << 11) | (address << 5);
+ transfer[0].tx_buf = &req.command;
+ transfer[0].rx_buf = NULL;
+ transfer[0].len = 2;
+ spi_message_add_tail(&transfer[0], &req.message);
+
+ /* Data */
+ transfer[1].tx_buf = &data;
+ transfer[1].rx_buf = NULL;
+ transfer[1].len = 2;
+ transfer[1].cs_change = CS_CHANGE(1);
+ spi_message_add_tail(&transfer[1], &req.message);
+
+ ret = spi_sync(dev->spi, &req.message);
+ if (!ret && req.message.status)
+ ret = req.message.status;
+ if (ret)
+ dev_dbg(&dev->spi->dev, "write_sync --> %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(tsc210x_write_sync);
+
+int tsc210x_reads_sync(struct tsc210x_dev *dev,
+ int page, u8 startaddress, u16 *data, int numregs)
+{
+ static struct tsc210x_spi_req req;
+ static struct spi_transfer transfer[6];
+ int ret, i, j;
+
+ if (numregs + 1 > ARRAY_SIZE(transfer))
+ return -EINVAL;
+
+ spi_message_init(&req.message);
+ i = 0;
+ j = 0;
+
+ /* Address */
+ req.command = 0x8000 | (page << 11) | (startaddress << 5);
+ transfer[i].tx_buf = &req.command;
+ transfer[i].rx_buf = NULL;
+ transfer[i].len = 2;
+ spi_message_add_tail(&transfer[i ++], &req.message);
+
+ /* Data */
+ while (j < numregs) {
+ transfer[i].tx_buf = NULL;
+ transfer[i].rx_buf = &data[j ++];
+ transfer[i].len = 2;
+ transfer[i].cs_change = CS_CHANGE(j == numregs);
+ spi_message_add_tail(&transfer[i ++], &req.message);
+ }
+
+ ret = spi_sync(dev->spi, &req.message);
+ if (!ret && req.message.status)
+ ret = req.message.status;
+ if (ret)
+ dev_dbg(&dev->spi->dev, "reads_sync --> %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(tsc210x_reads_sync);
+
+int tsc210x_read_sync(struct tsc210x_dev *dev, int page, u8 address)
+{
+ u16 ret;
+ int status;
+
+ status = tsc210x_reads_sync(dev, page, address, &ret, 1);
+ return status ? : ret;
+}
+EXPORT_SYMBOL(tsc210x_read_sync);
+
+
+static void tsc210x_submit_async(struct tsc210x_spi_req *spi)
+{
+ int ret;
+
+ ret = spi_async(spi->dev, &spi->message);
+ if (ret)
+ dev_dbg(&spi->dev->dev, "%s: error %i in SPI request\n",
+ __FUNCTION__, ret);
+}
+
+static void tsc210x_request_alloc(struct tsc210x_dev *dev,
+ struct tsc210x_spi_req *spi, int direction,
+ int page, u8 startaddress, int numregs, u16 *data,
+ void (*complete)(struct tsc210x_dev *context),
+ struct spi_transfer **transfer)
+{
+ spi->dev = dev->spi;
+
+ if (direction == 1) /* Write */
+ numregs = 2;
+ else /* Read */
+ numregs += 1;
+
+ spi_message_init(&spi->message);
+ spi->message.complete = (void (*)(void *)) complete;
+ spi->message.context = dev;
+
+ /* Address */
+ spi->command = (page << 11) | (startaddress << 5);
+ if (direction != 1)
+ spi->command |= 1 << 15;
+
+ (*transfer)->tx_buf = &spi->command;
+ (*transfer)->rx_buf = NULL;
+ (*transfer)->len = 2;
+ spi_message_add_tail((*transfer) ++, &spi->message);
+
+ /* Data */
+ while (-- numregs) {
+ if (direction == 1)
+ (*transfer)->tx_buf = &spi->data;
+ else
+ (*transfer)->rx_buf = data++;
+ (*transfer)->len = 2;
+ (*transfer)->cs_change = CS_CHANGE(numregs != 1);
+ spi_message_add_tail((*transfer) ++, &spi->message);
+ }
+}
+
+#define tsc210x_cb_register_func(cb, cb_t) \
+int tsc210x_ ## cb(struct device *dev, cb_t handler, void *context) \
+{ \
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev); \
+ \
+ /* Lock the module */ \
+ if (handler && !tsc->cb) \
+ if (!try_module_get(THIS_MODULE)) { \
+ dev_err(dev, "Failed to get TSC module\n"); \
+ } \
+ if (!handler && tsc->cb) \
+ module_put(THIS_MODULE); \
+ \
+ tsc->cb = handler; \
+ tsc->cb ## _ctx = context; \
+ return 0; \
+} \
+EXPORT_SYMBOL(tsc210x_ ## cb);
+
+tsc210x_cb_register_func(touch_cb, tsc210x_touch_t)
+tsc210x_cb_register_func(coords_cb, tsc210x_coords_t)
+tsc210x_cb_register_func(ports_cb, tsc210x_ports_t)
+tsc210x_cb_register_func(temp1_cb, tsc210x_temp_t)
+tsc210x_cb_register_func(temp2_cb, tsc210x_temp_t)
+
+#ifdef DEBUG
+static void tsc210x_print_dav(struct tsc210x_dev *dev)
+{
+ int status = tsc210x_read_sync(dev, TSC210X_TS_STATUS_CTRL);
+
+ if (status < 0) {
+ dev_dbg(&dev->spi->dev, "status %d\n", status);
+ return;
+ }
+
+ if (!(status & 0x0fff))
+ return;
+
+ dev_dbg(&dev->spi->dev, "data in %s%s%s%s%s%s%s%s%s%s%s\n",
+ (status & 0x0400) ? " X" : "",
+ (status & 0x0200) ? " Y" : "",
+ (status & 0x0100) ? " Z1" : "",
+ (status & 0x0080) ? " Z2" : "",
+ (status & 0x0040) ? " BAT1" : "",
+ (status & 0x0020) ? " BAT2" : "",
+ (status & 0x0010) ? " AUX1" : "",
+ (status & 0x0008) ? " AUX2" : "",
+ (status & 0x0004) ? " TEMP1" : "",
+ (status & 0x0002) ? " TEMP2" : "",
+ (status & 0x0001) ? " KP" : "");
+}
+#endif
+
+static void tsc210x_complete_dummy(struct tsc210x_dev *dev)
+{
+}
+
+static inline void tsc210x_touchscreen_mode(struct tsc210x_dev *dev)
+{
+ /* Scan X, Y, Z1, Z2, chip controlled, 12-bit, 16 samples, 500 usec */
+ dev->req_mode.data = TSC210X_ADC_TS_CONTROL;
+ tsc210x_submit_async(&dev->req_mode);
+}
+
+static inline void tsc210x_portscan_mode(struct tsc210x_dev *dev)
+{
+ /* Scan BAT1, BAT2, AUX1, AUX2, 12-bit, 16 samples, 500 usec */
+ dev->req_mode.data = TSC210X_ADC_SCAN_CONTROL;
+ tsc210x_submit_async(&dev->req_mode);
+}
+
+static inline void tsc210x_temp1_mode(struct tsc210x_dev *dev)
+{
+ /* Scan TEMP1, 12-bit, 16 samples, 500 usec */
+ dev->req_mode.data = TSC210X_ADC_T1_CONTROL;
+ tsc210x_submit_async(&dev->req_mode);
+}
+
+static inline void tsc210x_temp2_mode(struct tsc210x_dev *dev)
+{
+ /* Scan TEMP2, 12-bit, 16 samples, 500 usec */
+ dev->req_mode.data = TSC210X_ADC_T2_CONTROL;
+ tsc210x_submit_async(&dev->req_mode);
+}
+
+/* Abort current conversion if any */
+static void tsc210x_new_mode(struct tsc210x_dev *dev)
+{
+ dev->req_stop.data = TSC210X_ADC_ADST;
+ tsc210x_submit_async(&dev->req_stop);
+}
+
+static void tsc210x_queue_scan(struct tsc210x_dev *dev)
+{
+ if (dev->pdata->monitor)
+ if (!queue_delayed_work(dev->queue,
+ &dev->sensor_worker,
+ msecs_to_jiffies(settings.mode_msecs)))
+ dev_err(&dev->spi->dev,
+ "%s: can't queue measurements\n",
+ __FUNCTION__);
+}
+
+static void tsc210x_queue_penup(struct tsc210x_dev *dev)
+{
+ if (!queue_delayed_work(dev->queue,
+ &dev->ts_worker,
+ msecs_to_jiffies(settings.ts_msecs)))
+ dev_err(&dev->spi->dev,
+ "%s: can't queue pen-up poll\n",
+ __FUNCTION__);
+}
+
+static void tsc210x_status_report(struct tsc210x_dev *dev)
+{
+ /*
+ * Read all converted data from corresponding registers
+ * so that the ADC can move on to a new conversion.
+ */
+ if (dev->status & TSC210X_TS_DAV) {
+ if (!dev->pendown && !dev->flushing) {
+ dev->pendown = 1;
+ if (dev->touch_cb)
+ dev->touch_cb(dev->touch_cb_ctx, 1);
+
+ tsc210x_queue_penup(dev);
+ }
+
+ tsc210x_submit_async(&dev->req_adc);
+ }
+
+ if (dev->status & (TSC210X_PS_DAV | TSC210X_T1_DAV | TSC210X_T2_DAV))
+ complete(&dev->data_avail);
+}
+
+static void tsc210x_data_report(struct tsc210x_dev *dev)
+{
+ u16 adc_data[4];
+
+ if (dev->status & TSC210X_PS_DAV) {
+ tsc210x_reads_sync(dev, TSC210X_TS_BAT1, adc_data, 4);
+ /* NOTE: reads_sync() could fail */
+
+ dev->bat[0] = adc_data[0];
+ dev->bat[1] = adc_data[1];
+ dev->aux[0] = adc_data[2];
+ dev->aux[1] = adc_data[3];
+ if (dev->ports_cb)
+ dev->ports_cb(dev->ports_cb_ctx, dev->bat, dev->aux);
+ }
+
+ if (dev->status & TSC210X_T1_DAV) {
+ dev->temp[0] = tsc210x_read_sync(dev, TSC210X_TS_TEMP1);
+
+ if (dev->temp[0] >= 0 && dev->temp1_cb)
+ dev->temp1_cb(dev->temp1_cb_ctx, dev->temp[0]);
+ }
+
+ if (dev->status & TSC210X_T2_DAV) {
+ dev->temp[1] = tsc210x_read_sync(dev, TSC210X_TS_TEMP2);
+
+ if (dev->temp[1] >= 0 && dev->temp2_cb)
+ dev->temp2_cb(dev->temp2_cb_ctx, dev->temp[1]);
+ }
+}
+
+static void tsc210x_coords_report(struct tsc210x_dev *dev)
+{
+ if (dev->coords_cb)
+ dev->coords_cb(dev->coords_cb_ctx,
+ dev->adc_data[0], dev->adc_data[1],
+ dev->adc_data[2], dev->adc_data[3]);
+}
+
+/*
+ * There are at least three ways to check for pen-up:
+ * - the PINT/DAV pin state,
+ * - reading PSTCM bit in ADC Control register (D15, offset 0x00),
+ * - reading ADST bit in ADC Control register (D14, offset 0x00),
+ * ADC idle would indicate no screen touch.
+ * Unfortunately none of them seems to be 100% accurate and you will
+ * find they are totally inconsistent, i.e. you get to see any arbitrary
+ * combination of values in these three bits. So we will busy-wait
+ * for a moment when the latter two indicate a pen-up, using a queue,
+ * before we report a pen-up.
+ */
+static void tsc210x_pressure(struct work_struct *work)
+{
+ struct tsc210x_dev *dev =
+ container_of(work, struct tsc210x_dev, ts_worker.work);
+ int adc_status;
+
+ WARN_ON(!dev->pendown);
+
+ adc_status = tsc210x_read_sync(dev, TSC210X_TS_ADC_CTRL);
+ if (adc_status < 0) {
+ dev_dbg(&dev->spi->dev, "pressure, err %d\n", adc_status);
+ return;
+ }
+
+ if ((adc_status & TSC210X_ADC_PSTCM) != 0
+ || !(adc_status & TSC210X_ADC_ADST))
+ tsc210x_queue_penup(dev);
+ else {
+ dev->pendown = 0;
+ if (dev->touch_cb)
+ dev->touch_cb(dev->touch_cb_ctx, 0);
+ }
+}
+
+static void tsc210x_wait_data(struct tsc210x_dev *dev)
+{
+ wait_for_completion(&dev->data_avail);
+
+ tsc210x_data_report(dev);
+}
+
+static void tsc210x_input_scan(struct work_struct *work)
+{
+ struct tsc210x_dev *dev = (struct tsc210x_dev *)
+ container_of(work, struct tsc210x_dev, sensor_worker.work);
+
+ tsc210x_new_mode(dev);
+
+ if (dev->pdata->monitor &
+ (TSC_BAT1 | TSC_BAT2 | TSC_AUX1 | TSC_AUX2)) {
+ tsc210x_portscan_mode(dev);
+ tsc210x_wait_data(dev);
+ }
+
+ if (dev->pdata->monitor & TSC_TEMP) {
+ tsc210x_temp1_mode(dev);
+ tsc210x_wait_data(dev);
+
+ tsc210x_temp2_mode(dev);
+ tsc210x_wait_data(dev);
+ }
+
+ tsc210x_touchscreen_mode(dev);
+
+ mutex_lock(&dev->queue_lock);
+ if (!dev->flushing)
+ tsc210x_queue_scan(dev);
+ mutex_unlock(&dev->queue_lock);
+}
+
+/* ADC has finished a new conversion for us. */
+static irqreturn_t tsc210x_handler(int irq, void *dev_id)
+{
+ struct tsc210x_dev *dev = (struct tsc210x_dev *) dev_id;
+
+ /* See what data became available. */
+ tsc210x_submit_async(&dev->req_status);
+
+ return IRQ_HANDLED;
+}
+
+#if defined(CONFIG_SOUND) || defined(CONFIG_SOUND_MODULE)
+
+/*
+ * FIXME the audio support shouldn't be included in upstream patches
+ * until it's ready. They might be better as utility functions linked
+ * with a chip-specific tsc21xx audio module ... e.g. chips with input
+ * channels need more, as will ones with multiple output channels and
+ * so on. Each of these functions should probably return a fault code,
+ * and will need to be exported so the sound drier can be modular.
+ */
+
+/*
+ * Volume level values should be in the range [0, 127].
+ * Higher values mean lower volume.
+ */
+void tsc210x_set_dac_volume(struct device *dev, u8 left_ch, u8 right_ch)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ if (tsc->kind == tsc2102) {
+ /* All 0's or all 1's */
+ if (left_ch == 0x00 || left_ch == 0x7f)
+ left_ch ^= 0x7f;
+ if (right_ch == 0x00 || right_ch == 0x7f)
+ right_ch ^= 0x7f;
+ }
+
+ val = tsc210x_read_sync(tsc, TSC210X_DAC_GAIN_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ val &= 0x8080; /* Preserve mute-bits */
+ val |= (left_ch << 8) | right_ch;
+
+ tsc210x_write_sync(tsc, TSC210X_DAC_GAIN_CTRL, val);
+ /* NOTE: write_sync() could fail */
+}
+
+void tsc210x_set_dac_mute(struct device *dev, int left_ch, int right_ch)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ val = tsc210x_read_sync(tsc, TSC210X_DAC_GAIN_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ val &= 0x7f7f; /* Preserve volume settings */
+ val |= (left_ch << 15) | (right_ch << 7);
+
+ tsc210x_write_sync(tsc, TSC210X_DAC_GAIN_CTRL, val);
+ /* NOTE: write_sync() could fail */
+}
+
+void tsc210x_get_dac_mute(struct device *dev, int *left_ch, int *right_ch)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ val = tsc210x_read_sync(tsc, TSC210X_DAC_GAIN_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ *left_ch = !!(val & (1 << 15));
+ *right_ch = !!(val & (1 << 7));
+}
+
+void tsc210x_set_deemphasis(struct device *dev, int enable)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ val = tsc210x_read_sync(tsc, TSC210X_POWER_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ if (enable)
+ val &= ~TSC210X_DEEMPF;
+ else
+ val |= TSC210X_DEEMPF;
+
+ tsc210x_write_sync(tsc, TSC210X_POWER_CTRL, val);
+ /* NOTE: write_sync() could fail */
+}
+
+void tsc2102_set_bassboost(struct device *dev, int enable)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ val = tsc210x_read_sync(tsc, TSC210X_POWER_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ if (enable)
+ val &= ~TSC2102_BASSBC;
+ else
+ val |= TSC2102_BASSBC;
+
+ tsc210x_write_sync(tsc, TSC210X_POWER_CTRL, val);
+ /* NOTE: write_sync() could fail */
+}
+
+/* {rate, dsor, fsref} */
+static const struct tsc210x_rate_info_s tsc2101_rates[] = {
+ /* Fsref / 6.0 */
+ {7350, 7, 1},
+ {8000, 7, 0},
+ /* Fsref / 5.5 */
+ {8018, 6, 1},
+ {8727, 6, 0},
+ /* Fsref / 5.0 */
+ {8820, 5, 1},
+ {9600, 5, 0},
+ /* Fsref / 4.0 */
+ {11025, 4, 1},
+ {12000, 4, 0},
+ /* Fsref / 3.0 */
+ {14700, 3, 1},
+ {16000, 3, 0},
+ /* Fsref / 2.0 */
+ {22050, 2, 1},
+ {24000, 2, 0},
+ /* Fsref / 1.5 */
+ {29400, 1, 1},
+ {32000, 1, 0},
+ /* Fsref */
+ {44100, 0, 1},
+ {48000, 0, 0},
+
+ {0, 0, 0},
+};
+
+/* {rate, dsor, fsref} */
+static const struct tsc210x_rate_info_s tsc2102_rates[] = {
+ /* Fsref / 6.0 */
+ {7350, 63, 1},
+ {8000, 63, 0},
+ /* Fsref / 6.0 */
+ {7350, 54, 1},
+ {8000, 54, 0},
+ /* Fsref / 5.0 */
+ {8820, 45, 1},
+ {9600, 45, 0},
+ /* Fsref / 4.0 */
+ {11025, 36, 1},
+ {12000, 36, 0},
+ /* Fsref / 3.0 */
+ {14700, 27, 1},
+ {16000, 27, 0},
+ /* Fsref / 2.0 */
+ {22050, 18, 1},
+ {24000, 18, 0},
+ /* Fsref / 1.5 */
+ {29400, 9, 1},
+ {32000, 9, 0},
+ /* Fsref */
+ {44100, 0, 1},
+ {48000, 0, 0},
+
+ {0, 0, 0},
+};
+
+int tsc210x_set_rate(struct device *dev, int rate)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int i;
+ int val;
+ const struct tsc210x_rate_info_s *rates;
+
+ if (tsc->kind == tsc2101)
+ rates = tsc2101_rates;
+ else
+ rates = tsc2102_rates;
+
+ for (i = 0; rates[i].sample_rate; i ++)
+ if (rates[i].sample_rate == rate)
+ break;
+ if (rates[i].sample_rate == 0) {
+ dev_err(dev, "Unknown sampling rate %i.0 Hz\n", rate);
+ return -EINVAL;
+ }
+
+ if (tsc->kind == tsc2101) {
+ val = tsc210x_read_sync(tsc, TSC210X_AUDIO1_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return val;
+ }
+ val &= ~((7 << 3) | (7 << 0));
+ val |= rates[i].divisor << 3;
+ val |= rates[i].divisor << 0;
+ } else
+ val = rates[i].divisor;
+
+ tsc210x_write_sync(tsc, TSC210X_AUDIO1_CTRL, val);
+ /* NOTE: write_sync() could fail */
+
+ val = tsc210x_read_sync(tsc, TSC210X_AUDIO3_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return val;
+ }
+
+ if (tsc2102_rates[i].fs_44k) {
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO3_CTRL, val | TSC210X_FS44K);
+ /* Enable Phase-locked-loop, set up clock dividers */
+ tsc210x_write_sync(tsc, TSC210X_PLL1_CTRL, TSC210X_PLL1_44K);
+ tsc210x_write_sync(tsc, TSC210X_PLL2_CTRL, TSC210X_PLL2_44K);
+ } else {
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO3_CTRL, val & ~TSC210X_FS44K);
+ /* Enable Phase-locked-loop, set up clock dividers */
+ tsc210x_write_sync(tsc, TSC210X_PLL1_CTRL, TSC210X_PLL1_48K);
+ tsc210x_write_sync(tsc, TSC210X_PLL2_CTRL, TSC210X_PLL2_48K);
+ }
+
+ return 0;
+}
+
+/*
+ * Perform basic set-up with default values and power the DAC/ADC on.
+ */
+void tsc210x_dac_power(struct device *dev, int on)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+
+ /* NOTE: write_sync() could fail */
+ if (on) {
+ /* 16-bit words, DSP mode, sample at Fsref */
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO1_CTRL, 0x0100);
+ /* Keyclicks off, soft-stepping at normal rate */
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO2_CTRL, TSC210X_KEYCLICK_OFF);
+ /* 44.1 kHz Fsref, continuous transfer mode, master DAC */
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO3_CTRL, 0x2000);
+ /* Soft-stepping enabled, 1 dB MIX AGC hysteresis */
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO4_CTRL, 0x0000);
+
+ /* PLL generates 44.1 kHz */
+ tsc210x_write_sync(tsc,
+ TSC210X_PLL1_CTRL, TSC210X_PLL1_44K);
+ tsc210x_write_sync(tsc,
+ TSC210X_PLL2_CTRL, TSC210X_PLL2_44K);
+
+ /* Codec & DAC power up, virtual ground disabled */
+ tsc210x_write_sync(tsc,
+ TSC210X_POWER_CTRL, (tsc->kind == tsc2101) ?
+ TSC2101_DAC_ON : TSC2102_DAC_ON);
+ } else {
+ /* All off */
+ tsc210x_write_sync(tsc,
+ TSC210X_AUDIO2_CTRL, TSC210X_KEYCLICK_OFF);
+ tsc210x_write_sync(tsc,
+ TSC210X_PLL1_CTRL, TSC210X_PLL1_OFF);
+#if 0
+ tsc210x_write_sync(tsc,
+ TSC210X_POWER_CTRL, (tsc->kind == tsc2101) ?
+ TSC2102_DAC_OFF : TSC2102_DAC_OFF);
+#endif
+ }
+}
+
+void tsc210x_set_i2s_master(struct device *dev, int state)
+{
+ struct tsc210x_dev *tsc = dev_get_drvdata(dev);
+ int val;
+
+ val = tsc210x_read_sync(tsc, TSC210X_AUDIO3_CTRL);
+ if (val < 0) {
+ dev_dbg(dev, "%s, err %d\n", __FUNCTION__, val);
+ return;
+ }
+
+ /* NOTE: write_sync() could fail */
+ if (state)
+ tsc210x_write_sync(tsc, TSC210X_AUDIO3_CTRL,
+ val | TSC210X_SLVMS);
+ else
+ tsc210x_write_sync(tsc, TSC210X_AUDIO3_CTRL,
+ val & ~TSC210X_SLVMS);
+}
+#endif /* CONFIG_SOUND */
+
+static int tsc210x_configure(struct tsc210x_dev *dev)
+{
+ /* NOTE: write_sync() could fail */
+
+ /* Reset the chip */
+ tsc210x_write_sync(dev, TSC210X_TS_RESET_CTRL, TSC210X_RESET);
+
+ /* Reference mode */
+ if (dev->pdata->use_internal)
+ tsc210x_write_sync(dev,
+ TSC210X_TS_REF_CTRL, TSC210X_ADC_INT_REF);
+ else
+ tsc210x_write_sync(dev,
+ TSC210X_TS_REF_CTRL, TSC210X_ADC_EXT_REF);
+
+ /* Precharge and sense delays, pen touch detection on */
+ tsc210x_write_sync(dev, TSC210X_TS_CONFIG_CTRL, TSC210X_CONFIG_TIMES);
+
+ /* PINT/DAV acts as DAV */
+ tsc210x_write_sync(dev, TSC210X_TS_STATUS_CTRL, TSC210X_ADC_DAV);
+
+ tsc210x_queue_scan(dev);
+ return 0;
+}
+
+void tsc210x_keyclick(struct tsc210x_dev *dev,
+ int amplitude, int freq, int length)
+{
+ int val;
+
+ val = tsc210x_read_sync(dev, TSC210X_AUDIO2_CTRL);
+ if (val < 0) {
+ dev_dbg(&dev->spi->dev, "%s, err %d\n",
+ __FUNCTION__, val);
+ return;
+ }
+ val &= 0x800f;
+
+ /* Set amplitude */
+ switch (amplitude) {
+ case 1:
+ val |= 4 << 12;
+ break;
+ case 2:
+ val |= 7 << 12;
+ break;
+ default:
+ break;
+ }
+
+ /* Frequency */
+ val |= (freq & 0x7) << 8;
+
+ /* Round to nearest supported length */
+ if (dev->kind == tsc2101)
+ val = (min(length - 1, 31) >> 1) << 4;
+ else {
+ if (length > 20)
+ val |= 4 << 4;
+ else if (length > 6)
+ val |= 3 << 4;
+ else if (length > 4)
+ val |= 2 << 4;
+ else if (length > 2)
+ val |= 1 << 4;
+ }
+
+ /* Enable keyclick */
+ val |= 0x8000;
+
+ /* NOTE: write_sync() could fail */
+ tsc210x_write_sync(dev, TSC210X_AUDIO2_CTRL, val);
+}
+EXPORT_SYMBOL(tsc210x_keyclick);
+
+#ifdef CONFIG_PM
+/*
+ * Suspend the chip.
+ */
+static int
+tsc210x_suspend(struct spi_device *spi, pm_message_t state)
+{
+ struct tsc210x_dev *dev = dev_get_drvdata(&spi->dev);
+
+ if (!dev)
+ return -ENODEV;
+
+ /* Stop the inputs scan loop */
+ mutex_lock(&dev->queue_lock);
+ dev->flushing = 1;
+ cancel_delayed_work(&dev->sensor_worker);
+ mutex_unlock(&dev->queue_lock);
+ flush_workqueue(dev->queue);
+
+ /* Wait until pen-up happens */
+ while (dev->pendown)
+ flush_workqueue(dev->queue);
+
+ /* Abort current conversion and power down the ADC */
+ tsc210x_write_sync(dev, TSC210X_TS_ADC_CTRL, TSC210X_ADC_ADST);
+ /* NOTE: write_sync() could fail */
+
+ return 0;
+}
+
+/*
+ * Resume chip operation.
+ */
+static int tsc210x_resume(struct spi_device *spi)
+{
+ struct tsc210x_dev *dev = dev_get_drvdata(&spi->dev);
+ int err;
+
+ if (!dev)
+ return 0;
+
+ mutex_lock(&dev->queue_lock);
+ err = tsc210x_configure(dev);
+
+ dev->flushing = 0;
+ mutex_unlock(&dev->queue_lock);
+
+ return err;
+}
+#else
+#define tsc210x_suspend NULL
+#define tsc210x_resume NULL
+#endif
+
+/* REVISIT don't make these static */
+static struct platform_device tsc210x_ts_device = {
+ .name = "tsc210x-ts",
+ .id = -1,
+};
+
+static struct platform_device tsc210x_hwmon_device = {
+ .name = "tsc210x-hwmon",
+ .id = -1,
+};
+
+static struct platform_device tsc210x_alsa_device = {
+ .name = "tsc210x-alsa",
+ .id = -1,
+};
+
+static int tsc210x_probe(struct spi_device *spi, enum tsc_type type)
+{
+ struct tsc210x_config *pdata = spi->dev.platform_data;
+ struct spi_transfer *spi_buffer;
+ struct tsc210x_dev *dev;
+ int reg;
+ int err = 0;
+
+ if (!pdata) {
+ dev_dbg(&spi->dev, "Platform data not supplied\n");
+ return -ENOENT;
+ }
+
+ if (!spi->irq) {
+ dev_dbg(&spi->dev, "Invalid irq value\n");
+ return -EINVAL;
+ }
+
+ dev = (struct tsc210x_dev *)
+ kzalloc(sizeof(struct tsc210x_dev), GFP_KERNEL);
+ if (!dev) {
+ dev_dbg(&spi->dev, "No memory\n");
+ return -ENOMEM;
+ }
+
+ dev->pdata = pdata;
+ dev->pendown = 0;
+ dev->spi = spi;
+ dev->kind = type;
+ dev->queue = create_singlethread_workqueue(spi->dev.driver->name);
+ if (!dev->queue) {
+ dev_dbg(&spi->dev, "Can't make a workqueue\n");
+ err = -ENOMEM;
+ goto err_queue;
+ }
+
+ mutex_init(&dev->queue_lock);
+ init_completion(&dev->data_avail);
+
+ /* Allocate enough struct spi_transfer's for all requests */
+ spi_buffer = kzalloc(sizeof(struct spi_transfer) * 16, GFP_KERNEL);
+ if (!spi_buffer) {
+ dev_dbg(&spi->dev, "No memory for SPI buffers\n");
+ err = -ENOMEM;
+ goto err_buffers;
+ }
+
+ dev->transfers = spi_buffer;
+ tsc210x_request_alloc(dev, &dev->req_adc, 0,
+ TSC210X_TS_X, 4, dev->adc_data,
+ tsc210x_coords_report, &spi_buffer);
+ tsc210x_request_alloc(dev, &dev->req_status, 0,
+ TSC210X_TS_STATUS_CTRL, 1, &dev->status,
+ tsc210x_status_report, &spi_buffer);
+ tsc210x_request_alloc(dev, &dev->req_mode, 1,
+ TSC210X_TS_ADC_CTRL, 1, NULL,
+ tsc210x_complete_dummy, &spi_buffer);
+ tsc210x_request_alloc(dev, &dev->req_stop, 1,
+ TSC210X_TS_ADC_CTRL, 1, NULL,
+ tsc210x_complete_dummy, &spi_buffer);
+
+ if (pdata->bclk) {
+ /* Get the BCLK */
+ dev->bclk_ck = clk_get(&spi->dev, pdata->bclk);
+ if (IS_ERR(dev->bclk_ck)) {
+ err = PTR_ERR(dev->bclk_ck);
+ dev_dbg(&spi->dev, "Unable to get '%s': %i\n",
+ pdata->bclk, err);
+ goto err_clk;
+ }
+
+ clk_enable(dev->bclk_ck);
+ }
+
+ INIT_DELAYED_WORK(&dev->ts_worker, tsc210x_pressure);
+ INIT_DELAYED_WORK(&dev->sensor_worker, tsc210x_input_scan);
+
+ /* Setup the communication bus */
+ dev_set_drvdata(&spi->dev, dev);
+ spi->mode = SPI_MODE_1;
+ spi->bits_per_word = 16;
+ err = spi_setup(spi);
+ if (err)
+ goto err_spi;
+
+ /* Now try to detect the chip, make first contact. These chips
+ * don't self-identify, but we can expect that the status register
+ * reports the ADC is idle and use that as a sanity check. (It'd
+ * be even better if we did a soft reset first...)
+ */
+ reg = tsc210x_read_sync(dev, TSC210X_TS_ADC_CTRL);
+ if (reg < 0) {
+ err = reg;
+ dev_dbg(&dev->spi->dev, "adc_ctrl, err %d\n", err);
+ goto err_spi;
+ }
+ if (!(reg & (1 << 14))) {
+ err = -EIO;
+ dev_dbg(&dev->spi->dev, "adc_ctrl, busy? - %04x\n", reg);
+ goto err_spi;
+ }
+
+ reg = tsc210x_read_sync(dev, TSC210X_AUDIO3_CTRL);
+ if (reg < 0) {
+ err = reg;
+ dev_dbg(&dev->spi->dev, "revision, err %d\n", err);
+ goto err_spi;
+ }
+ if (reg == 0xffff) {
+ err = -ENODEV;
+ dev_dbg(&dev->spi->dev, "no device, err %d\n", err);
+ goto err_spi;
+ }
+ dev_info(&spi->dev, "rev %d, irq %d\n", reg & 0x0007, spi->irq);
+
+ err = tsc210x_configure(dev);
+ if (err)
+ goto err_spi;
+
+ /* We want no interrupts before configuration succeeds. */
+ mutex_lock(&dev->queue_lock);
+ dev->flushing = 1;
+
+ if (request_irq(spi->irq, tsc210x_handler, IRQF_SAMPLE_RANDOM |
+ IRQF_TRIGGER_FALLING, spi->dev.driver->name,
+ dev)) {
+ dev_dbg(&spi->dev, "Could not allocate touchscreen IRQ!\n");
+ err = -EINVAL;
+ goto err_irq;
+ }
+
+ /* Register subdevices controlled by the TSC 2101/2102 */
+ tsc210x_ts_device.dev.platform_data = dev;
+ tsc210x_ts_device.dev.parent = &spi->dev;
+ err = platform_device_register(&tsc210x_ts_device);
+ if (err)
+ goto err_irq;
+
+ tsc210x_hwmon_device.dev.platform_data = pdata;
+ tsc210x_hwmon_device.dev.parent = &spi->dev;
+ err = platform_device_register(&tsc210x_hwmon_device);
+ if (err)
+ goto err_hwmon;
+
+ tsc210x_alsa_device.dev.platform_data = pdata->alsa_config;
+ tsc210x_alsa_device.dev.parent = &spi->dev;
+ err = platform_device_register(&tsc210x_alsa_device);
+ if (err)
+ goto err_alsa;
+
+ dev->flushing = 0;
+ mutex_unlock(&dev->queue_lock);
+ return 0;
+
+err_alsa:
+ platform_device_unregister(&tsc210x_hwmon_device);
+err_hwmon:
+ platform_device_unregister(&tsc210x_ts_device);
+err_irq:
+ mutex_unlock(&dev->queue_lock);
+err_spi:
+ dev_set_drvdata(&spi->dev, NULL);
+ clk_disable(dev->bclk_ck);
+ clk_put(dev->bclk_ck);
+err_clk:
+ kfree(dev->transfers);
+err_buffers:
+ destroy_workqueue(dev->queue);
+err_queue:
+ kfree(dev);
+ return err;
+}
+
+static int tsc2101_probe(struct spi_device *spi)
+{
+ return tsc210x_probe(spi, tsc2101);
+}
+
+static int tsc2102_probe(struct spi_device *spi)
+{
+ return tsc210x_probe(spi, tsc2102);
+}
+
+static int tsc210x_remove(struct spi_device *spi)
+{
+ struct tsc210x_dev *dev = dev_get_drvdata(&spi->dev);
+
+ /* Stop the inputs scan loop */
+ mutex_lock(&dev->queue_lock);
+ dev->flushing = 1;
+ cancel_delayed_work(&dev->sensor_worker);
+ mutex_unlock(&dev->queue_lock);
+ flush_workqueue(dev->queue);
+
+ /* Wait for pen-up */
+ while (dev->pendown)
+ flush_workqueue(dev->queue);
+
+ /* Abort current conversion and power down the ADC */
+ tsc210x_write_sync(dev, TSC210X_TS_ADC_CTRL, TSC210X_ADC_ADST);
+ /* NOTE: write_sync() could fail */
+
+ destroy_workqueue(dev->queue);
+
+ platform_device_unregister(&tsc210x_ts_device);
+ platform_device_unregister(&tsc210x_hwmon_device);
+ platform_device_unregister(&tsc210x_alsa_device);
+
+ dev_set_drvdata(&spi->dev, NULL);
+
+ /* Release the BCLK */
+ clk_disable(dev->bclk_ck);
+ clk_put(dev->bclk_ck);
+
+ kfree(dev->transfers);
+ kfree(dev);
+
+ return 0;
+}
+
+static struct spi_driver tsc2101_driver = {
+ .probe = tsc2101_probe,
+ .remove = tsc210x_remove,
+ .suspend = tsc210x_suspend,
+ .resume = tsc210x_resume,
+ .driver = {
+ .name = "tsc2101",
+ .owner = THIS_MODULE,
+ .bus = &spi_bus_type,
+ },
+};
+
+static struct spi_driver tsc2102_driver = {
+ .probe = tsc2102_probe,
+ .remove = tsc210x_remove,
+ .suspend = tsc210x_suspend,
+ .resume = tsc210x_resume,
+ .driver = {
+ .name = "tsc2102",
+ .owner = THIS_MODULE,
+ .bus = &spi_bus_type,
+ },
+};
+
+static char __initdata banner[] = KERN_INFO "TI TSC210x driver initializing\n";
+
+static int __init tsc210x_init(void)
+{
+ int err;
+ printk(banner);
+
+ settings.ts_msecs = 20;
+ settings.mode_msecs = 1000;
+
+ err = spi_register_driver(&tsc2101_driver);
+ if (err != 0)
+ return err;
+
+ err = spi_register_driver(&tsc2102_driver);
+ if (err != 0)
+ spi_unregister_driver(&tsc2101_driver);
+
+ return err;
+}
+module_init(tsc210x_init);
+
+static void __exit tsc210x_exit(void)
+{
+ spi_unregister_driver(&tsc2101_driver);
+ spi_unregister_driver(&tsc2102_driver);
+}
+module_exit(tsc210x_exit);
+
+MODULE_AUTHOR("Andrzej Zaborowski");
+MODULE_DESCRIPTION("Interface driver for TI TSC210x chips.");
+MODULE_LICENSE("GPL");
projects / linux-2.6-omap-h63xx.git / commitdiff