diff options
Diffstat (limited to 'drivers/input/touchscreen/max11801_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/max11801_ts.c | 161 |
1 files changed, 146 insertions, 15 deletions
diff --git a/drivers/input/touchscreen/max11801_ts.c b/drivers/input/touchscreen/max11801_ts.c index 1af08d3dfaf7..30dab2270708 100644 --- a/drivers/input/touchscreen/max11801_ts.c +++ b/drivers/input/touchscreen/max11801_ts.c @@ -3,7 +3,7 @@ * Driver for MAXI MAX11801 - A Resistive touch screen controller with * i2c interface * - * Copyright (C) 2011 Freescale Semiconductor, Inc. + * Copyright (C) 2011-2015 Freescale Semiconductor, Inc. * Author: Zhang Jiejing <jiejing.zhang@freescale.com> * * Based on mcs5000_ts.c @@ -34,6 +34,10 @@ #include <linux/input.h> #include <linux/slab.h> #include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_device.h> /* Register Address define */ #define GENERNAL_STATUS_REG 0x00 @@ -49,13 +53,30 @@ #define AUX_MESURE_CONF_REG 0x0a #define OP_MODE_CONF_REG 0x0b +#define Panel_Setup_X (0x69 << 1) +#define Panel_Setup_Y (0x6b << 1) + +#define XY_combined_measurement (0x70 << 1) +#define X_measurement (0x78 << 1) +#define Y_measurement (0x7a << 1) +#define AUX_measurement (0x76 << 1) + /* FIFO is found only in max11800 and max11801 */ #define FIFO_RD_CMD (0x50 << 1) #define MAX11801_FIFO_INT (1 << 2) #define MAX11801_FIFO_OVERFLOW (1 << 3) +#define MAX11801_EDGE_INT (1 << 1) + +#define FIFO_RD_X_MSB (0x52 << 1) +#define FIFO_RD_X_LSB (0x53 << 1) +#define FIFO_RD_Y_MSB (0x54 << 1) +#define FIFO_RD_Y_LSB (0x55 << 1) +#define FIFO_RD_AUX_MSB (0x5a << 1) +#define FIFO_RD_AUX_LSB (0x5b << 1) #define XY_BUFSIZE 4 #define XY_BUF_OFFSET 4 +#define AUX_BUFSIZE 2 #define MAX11801_MAX_X 0xfff #define MAX11801_MAX_Y 0xfff @@ -80,6 +101,64 @@ struct max11801_data { struct input_dev *input_dev; }; +static struct i2c_client *max11801_client; +static unsigned int max11801_workmode; +static u8 aux_buf[AUX_BUFSIZE]; + +static int max11801_dcm_write_command(struct i2c_client *client, int command) +{ + return i2c_smbus_write_byte(client, command); +} + +static u32 max11801_dcm_sample_aux(struct i2c_client *client) +{ + int ret; + int aux = 0; + u32 sample_data; + + /* AUX_measurement */ + max11801_dcm_write_command(client, AUX_measurement); + mdelay(5); + ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_AUX_MSB, + 1, &aux_buf[0]); + if (ret < 1) { + dev_err(&client->dev, "FIFO_RD_AUX_MSB read fails\n"); + return ret; + } + mdelay(5); + ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_AUX_LSB, + 1, &aux_buf[1]); + if (ret < 1) { + dev_err(&client->dev, "FIFO_RD_AUX_LSB read fails\n"); + return ret; + } + + aux = (aux_buf[0] << 4) + (aux_buf[1] >> 4); + /* + * voltage = (9170*aux)/7371; + * voltage is (26.2*3150*aux)/(16.2*0xFFF) + * V(aux)=3150*sample/0xFFF,V(battery)=212*V(aux)/81 + * sample_data = (14840*aux)/7371-1541; + */ + sample_data = (14840 * aux) / 7371; + + return sample_data; +} + +u32 max11801_read_adc(void) +{ + u32 adc_data; + + if (!max11801_client) { + pr_err("FAIL max11801_client not initialize\n"); + return -1; + } + adc_data = max11801_dcm_sample_aux(max11801_client); + + return adc_data; +} +EXPORT_SYMBOL_GPL(max11801_read_adc); + static u8 read_register(struct i2c_client *client, int addr) { /* XXX: The chip ignores LSB of register address */ @@ -100,21 +179,52 @@ static irqreturn_t max11801_ts_interrupt(int irq, void *dev_id) u8 buf[XY_BUFSIZE]; int x = -1; int y = -1; + u8 command = FIFO_RD_X_MSB; status = read_register(data->client, GENERNAL_STATUS_REG); - - if (status & (MAX11801_FIFO_INT | MAX11801_FIFO_OVERFLOW)) { + if ((!max11801_workmode && (status & (MAX11801_FIFO_INT | + MAX11801_FIFO_OVERFLOW))) || (max11801_workmode && (status & + MAX11801_EDGE_INT))) { status = read_register(data->client, GENERNAL_STATUS_REG); - - ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD, - XY_BUFSIZE, buf); - - /* - * We should get 4 bytes buffer that contains X,Y - * and event tag - */ - if (ret < XY_BUFSIZE) - goto out; + if (!max11801_workmode) { + /* ACM mode */ + ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD, + XY_BUFSIZE, buf); + /* + * We should get 4 bytes buffer that contains X,Y + * and event tag + */ + if (ret < XY_BUFSIZE) + goto out; + } else { + /* DCM mode */ + /* X = panel setup */ + max11801_dcm_write_command(client, Panel_Setup_X); + /* X_measurement */ + max11801_dcm_write_command(client, X_measurement); + for (i = 0; i < 2; i++) { + ret = i2c_smbus_read_i2c_block_data(client, + command, 1, &buf[i]); + if (ret < 1) + goto out; + + command = FIFO_RD_X_LSB; + } + + /* Y = panel setup */ + max11801_dcm_write_command(client, Panel_Setup_Y); + /* Y_measurement */ + max11801_dcm_write_command(client, Y_measurement); + command = FIFO_RD_Y_MSB; + for (i = 2; i < XY_BUFSIZE; i++) { + ret = i2c_smbus_read_i2c_block_data(client, + command, 1, &buf[i]); + if (ret < 1) + goto out; + + command = FIFO_RD_Y_LSB; + } + } for (i = 0; i < XY_BUFSIZE; i += XY_BUFSIZE / 2) { if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_X_TAG) @@ -133,6 +243,7 @@ static irqreturn_t max11801_ts_interrupt(int irq, void *dev_id) /* fall through */ case EVENT_MIDDLE: input_report_abs(data->input_dev, ABS_X, x); + y = MAX11801_MAX_Y - y; /* Calibration */ input_report_abs(data->input_dev, ABS_Y, y); input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1); input_sync(data->input_dev); @@ -155,7 +266,8 @@ static void max11801_ts_phy_init(struct max11801_data *data) { struct i2c_client *client = data->client; - /* Average X,Y, take 16 samples, average eight media sample */ + max11801_client = client; + /* Average X,Y, take 16 samples average eight media sample */ max11801_write_reg(client, MESURE_AVER_CONF_REG, 0xff); /* X,Y panel setup time set to 20us */ max11801_write_reg(client, PANEL_SETUPTIME_CONF_REG, 0x11); @@ -166,7 +278,22 @@ static void max11801_ts_phy_init(struct max11801_data *data) /* Aperture X,Y set to +- 4LSB */ max11801_write_reg(client, APERTURE_CONF_REG, 0x33); /* Enable Power, enable Automode, enable Aperture, enable Average X,Y */ - max11801_write_reg(client, OP_MODE_CONF_REG, 0x36); + if (!max11801_workmode) + max11801_write_reg(client, OP_MODE_CONF_REG, 0x36); + else { + max11801_write_reg(client, OP_MODE_CONF_REG, 0x16); + /* + * Delay initial=1ms, Sampling time 2us + * Averaging sample depth 2 + * samples, Resolution 12bit + */ + max11801_write_reg(client, AUX_MESURE_CONF_REG, 0x76); + /* + * Use edge interrupt with + * direct conversion mode + */ + max11801_write_reg(client, GENERNAL_CONF_REG, 0xf3); + } } static int max11801_ts_probe(struct i2c_client *client, @@ -175,6 +302,7 @@ static int max11801_ts_probe(struct i2c_client *client, struct max11801_data *data; struct input_dev *input_dev; int error; + struct device_node *of_node = client->dev.of_node; data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); input_dev = devm_input_allocate_device(&client->dev); @@ -196,6 +324,9 @@ static int max11801_ts_probe(struct i2c_client *client, input_set_abs_params(input_dev, ABS_X, 0, MAX11801_MAX_X, 0, 0); input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_Y, 0, 0); + if (of_property_read_u32(of_node, "work-mode", &max11801_workmode)) + max11801_workmode = *(int *)(client->dev).platform_data; + max11801_ts_phy_init(data); error = devm_request_threaded_irq(&client->dev, client->irq, NULL, |