X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=blobdiff_plain;f=drivers%2Fspi%2Ftsc210x.c;fp=drivers%2Fspi%2Ftsc210x.c;h=1d2ac94084c477590d151a38fe96c3f2090ea56c;hp=0000000000000000000000000000000000000000;hb=0d5f2216edfeb9904e0d6512f803b0f93871baaf;hpb=14fc69723d3442ef46f8f82b3f481e82f06a346d diff --git a/drivers/spi/tsc210x.c b/drivers/spi/tsc210x.c new file mode 100644 index 00000000000..1d2ac94084c --- /dev/null +++ b/drivers/spi/tsc210x.c @@ -0,0 +1,1262 @@ +/* + * tsc210x.c - TSC2101/2102/... driver core + * + * Copyright (c) 2005-2007 Andrzej Zaborowski + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +/* 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");