#include <linux/spi/ads7846.h>
#include <asm/irq.h>
-#ifdef CONFIG_ARM
-#include <asm/mach-types.h>
-#ifdef CONFIG_ARCH_OMAP
-#include <asm/arch/gpio.h>
-#endif
-#endif
-
/*
* This code has been heavily tested on a Nokia 770, and lightly
#endif
u16 model;
+ u16 vref_mv;
u16 vref_delay_usecs;
u16 x_plate_ohms;
u16 pressure_max;
* The range is GND..vREF. The ads7843 and ads7835 must use external vREF;
* ads7846 lets that pin be unconnected, to use internal vREF.
*/
-static unsigned vREF_mV;
-module_param(vREF_mV, uint, 0);
-MODULE_PARM_DESC(vREF_mV, "external vREF voltage, in milliVolts");
struct ser_req {
u8 ref_on;
struct ads7846 *ts = dev_get_drvdata(dev);
struct ser_req *req = kzalloc(sizeof *req, GFP_KERNEL);
int status;
- int uninitialized_var(sample);
int use_internal;
if (!req)
if (status == 0) {
/* on-wire is a must-ignore bit, a BE12 value, then padding */
- sample = be16_to_cpu(req->sample);
- sample = sample >> 3;
- sample &= 0x0fff;
+ status = be16_to_cpu(req->sample);
+ status = status >> 3;
+ status &= 0x0fff;
}
kfree(req);
- return status ? status : sample;
+ return status;
}
#if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE)
unsigned retval = v;
/* external resistors may scale vAUX into 0..vREF */
- retval *= vREF_mV;
+ retval *= ts->vref_mv;
retval = retval >> 12;
return retval;
}
/* hwmon sensors need a reference voltage */
switch (ts->model) {
case 7846:
- if (!vREF_mV) {
+ if (!ts->vref_mv) {
dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n");
- vREF_mV = 2500;
+ ts->vref_mv = 2500;
}
break;
case 7845:
case 7843:
- if (!vREF_mV) {
+ if (!ts->vref_mv) {
dev_warn(&spi->dev,
"external vREF for ADS%d not specified\n",
ts->model);
if (x == MAX_12BIT)
x = 0;
- if (likely(x && z1)) {
+ if (ts->model == 7843) {
+ Rt = ts->pressure_max / 2;
+ } else if (likely(x && z1)) {
/* compute touch pressure resistance using equation #2 */
Rt = z2;
Rt -= z1;
Rt *= ts->x_plate_ohms;
Rt /= z1;
Rt = (Rt + 2047) >> 12;
- } else
+ } else {
Rt = 0;
-
- if (ts->model == 7843)
- Rt = ts->pressure_max / 2;
+ }
/* Sample found inconsistent by debouncing or pressure is beyond
* the maximum. Don't report it to user space, repeat at least
struct ads7846 *ts = ads;
struct spi_message *m;
struct spi_transfer *t;
- u16 *rx_val;
int val;
int action;
int status;
m = &ts->msg[ts->msg_idx];
t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
- rx_val = t->rx_buf;
/* adjust: on-wire is a must-ignore bit, a BE12 value, then padding;
* built from two 8 bit values written msb-first.
*/
- val = be16_to_cpu(*rx_val) >> 3;
+ val = be16_to_cpup((__be16 *)t->rx_buf) >> 3;
action = ts->filter(ts->filter_data, ts->msg_idx, &val);
switch (action) {
m = ts->last_msg;
break;
case ADS7846_FILTER_OK:
- *rx_val = val;
+ *(u16 *)t->rx_buf = val;
ts->tc.ignore = 0;
m = &ts->msg[++ts->msg_idx];
break;
ts->spi = spi;
ts->input = input_dev;
+ ts->vref_mv = pdata->vref_mv;
hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
ts->timer.function = ads7846_timer;
static int __init ads7846_init(void)
{
- /* grr, board-specific init should stay out of drivers!! */
-
-#ifdef CONFIG_ARCH_OMAP
- if (machine_is_omap_osk()) {
- /* GPIO4 = PENIRQ; GPIO6 = BUSY */
- omap_request_gpio(4);
- omap_set_gpio_direction(4, 1);
- omap_request_gpio(6);
- omap_set_gpio_direction(6, 1);
- }
- // also TI 1510 Innovator, bitbanging through FPGA
- // also Nokia 770
- // also Palm Tungsten T2
-#endif
-
- // PXA:
- // also Dell Axim X50
- // also HP iPaq H191x/H192x/H415x/H435x
- // also Intel Lubbock (additional to UCB1400; as temperature sensor)
- // also Sharp Zaurus C7xx, C8xx (corgi/sheperd/husky)
-
- // Atmel at91sam9261-EK uses ads7843
-
- // also various AMD Au1x00 devel boards
-
return spi_register_driver(&ads7846_driver);
}
module_init(ads7846_init);
static void __exit ads7846_exit(void)
{
spi_unregister_driver(&ads7846_driver);
-
-#ifdef CONFIG_ARCH_OMAP
- if (machine_is_omap_osk()) {
- omap_free_gpio(4);
- omap_free_gpio(6);
- }
-#endif
-
}
module_exit(ads7846_exit);