499 lines
12 KiB
C
499 lines
12 KiB
C
/*
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* DRV2667 haptics driver family
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*
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* Author: Dan Murphy <dmurphy@ti.com>
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*
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* Copyright: (C) 2014 Texas Instruments, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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/* Contol registers */
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#define DRV2667_STATUS 0x00
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#define DRV2667_CTRL_1 0x01
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#define DRV2667_CTRL_2 0x02
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/* Waveform sequencer */
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#define DRV2667_WV_SEQ_0 0x03
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#define DRV2667_WV_SEQ_1 0x04
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#define DRV2667_WV_SEQ_2 0x05
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#define DRV2667_WV_SEQ_3 0x06
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#define DRV2667_WV_SEQ_4 0x07
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#define DRV2667_WV_SEQ_5 0x08
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#define DRV2667_WV_SEQ_6 0x09
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#define DRV2667_WV_SEQ_7 0x0A
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#define DRV2667_FIFO 0x0B
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#define DRV2667_PAGE 0xFF
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#define DRV2667_MAX_REG DRV2667_PAGE
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#define DRV2667_PAGE_0 0x00
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#define DRV2667_PAGE_1 0x01
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#define DRV2667_PAGE_2 0x02
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#define DRV2667_PAGE_3 0x03
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#define DRV2667_PAGE_4 0x04
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#define DRV2667_PAGE_5 0x05
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#define DRV2667_PAGE_6 0x06
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#define DRV2667_PAGE_7 0x07
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#define DRV2667_PAGE_8 0x08
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/* RAM fields */
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#define DRV2667_RAM_HDR_SZ 0x0
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/* RAM Header addresses */
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#define DRV2667_RAM_START_HI 0x01
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#define DRV2667_RAM_START_LO 0x02
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#define DRV2667_RAM_STOP_HI 0x03
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#define DRV2667_RAM_STOP_LO 0x04
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#define DRV2667_RAM_REPEAT_CT 0x05
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/* RAM data addresses */
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#define DRV2667_RAM_AMP 0x06
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#define DRV2667_RAM_FREQ 0x07
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#define DRV2667_RAM_DURATION 0x08
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#define DRV2667_RAM_ENVELOPE 0x09
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/* Control 1 Register */
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#define DRV2667_25_VPP_GAIN 0x00
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#define DRV2667_50_VPP_GAIN 0x01
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#define DRV2667_75_VPP_GAIN 0x02
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#define DRV2667_100_VPP_GAIN 0x03
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#define DRV2667_DIGITAL_IN 0xfc
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#define DRV2667_ANALOG_IN (1 << 2)
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/* Control 2 Register */
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#define DRV2667_GO (1 << 0)
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#define DRV2667_STANDBY (1 << 6)
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#define DRV2667_DEV_RST (1 << 7)
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/* RAM Envelope settings */
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#define DRV2667_NO_ENV 0x00
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#define DRV2667_32_MS_ENV 0x01
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#define DRV2667_64_MS_ENV 0x02
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#define DRV2667_96_MS_ENV 0x03
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#define DRV2667_128_MS_ENV 0x04
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#define DRV2667_160_MS_ENV 0x05
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#define DRV2667_192_MS_ENV 0x06
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#define DRV2667_224_MS_ENV 0x07
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#define DRV2667_256_MS_ENV 0x08
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#define DRV2667_512_MS_ENV 0x09
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#define DRV2667_768_MS_ENV 0x0a
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#define DRV2667_1024_MS_ENV 0x0b
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#define DRV2667_1280_MS_ENV 0x0c
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#define DRV2667_1536_MS_ENV 0x0d
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#define DRV2667_1792_MS_ENV 0x0e
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#define DRV2667_2048_MS_ENV 0x0f
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/**
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* struct drv2667_data -
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* @input_dev - Pointer to the input device
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* @client - Pointer to the I2C client
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* @regmap - Register map of the device
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* @work - Work item used to off load the enable/disable of the vibration
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* @regulator - Pointer to the regulator for the IC
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* @magnitude - Magnitude of the vibration event
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**/
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struct drv2667_data {
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struct input_dev *input_dev;
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struct i2c_client *client;
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struct regmap *regmap;
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struct work_struct work;
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struct regulator *regulator;
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u32 page;
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u32 magnitude;
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u32 frequency;
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};
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static struct reg_default drv2667_reg_defs[] = {
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{ DRV2667_STATUS, 0x02 },
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{ DRV2667_CTRL_1, 0x28 },
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{ DRV2667_CTRL_2, 0x40 },
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{ DRV2667_WV_SEQ_0, 0x00 },
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{ DRV2667_WV_SEQ_1, 0x00 },
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{ DRV2667_WV_SEQ_2, 0x00 },
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{ DRV2667_WV_SEQ_3, 0x00 },
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{ DRV2667_WV_SEQ_4, 0x00 },
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{ DRV2667_WV_SEQ_5, 0x00 },
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{ DRV2667_WV_SEQ_6, 0x00 },
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{ DRV2667_WV_SEQ_7, 0x00 },
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{ DRV2667_FIFO, 0x00 },
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{ DRV2667_PAGE, 0x00 },
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};
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static int drv2667_set_waveform_freq(struct drv2667_data *haptics)
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{
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unsigned int read_buf;
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int freq;
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int error;
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/* Per the data sheet:
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* Sinusoid Frequency (Hz) = 7.8125 x Frequency
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*/
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freq = (haptics->frequency * 1000) / 78125;
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if (freq <= 0) {
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dev_err(&haptics->client->dev,
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"ERROR: Frequency calculated to %i\n", freq);
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return -EINVAL;
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}
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error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to read the page number: %d\n", error);
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return -EIO;
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}
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if (read_buf == DRV2667_PAGE_0 ||
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haptics->page != read_buf) {
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error = regmap_write(haptics->regmap,
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DRV2667_PAGE, haptics->page);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the page: %d\n", error);
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return -EIO;
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}
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}
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error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ, freq);
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if (error)
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dev_err(&haptics->client->dev,
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"Failed to set the frequency: %d\n", error);
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/* Reset back to original page */
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if (read_buf == DRV2667_PAGE_0 ||
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haptics->page != read_buf) {
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error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the page: %d\n", error);
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return -EIO;
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}
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}
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return error;
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}
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static void drv2667_worker(struct work_struct *work)
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{
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struct drv2667_data *haptics = container_of(work, struct drv2667_data, work);
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int error;
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if (haptics->magnitude) {
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error = regmap_write(haptics->regmap,
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DRV2667_PAGE, haptics->page);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the page: %d\n", error);
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return;
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}
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error = regmap_write(haptics->regmap, DRV2667_RAM_AMP,
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haptics->magnitude);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the amplitude: %d\n", error);
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return;
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}
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error = regmap_write(haptics->regmap,
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DRV2667_PAGE, DRV2667_PAGE_0);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the page: %d\n", error);
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return;
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}
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error = regmap_write(haptics->regmap,
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DRV2667_CTRL_2, DRV2667_GO);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to set the GO bit: %d\n", error);
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}
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} else {
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error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
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DRV2667_GO, 0);
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to unset the GO bit: %d\n", error);
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}
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}
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}
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static int drv2667_haptics_play(struct input_dev *input, void *data,
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struct ff_effect *effect)
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{
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struct drv2667_data *haptics = input_get_drvdata(input);
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if (effect->u.rumble.strong_magnitude > 0)
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haptics->magnitude = effect->u.rumble.strong_magnitude;
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else if (effect->u.rumble.weak_magnitude > 0)
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haptics->magnitude = effect->u.rumble.weak_magnitude;
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else
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haptics->magnitude = 0;
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schedule_work(&haptics->work);
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return 0;
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}
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static void drv2667_close(struct input_dev *input)
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{
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struct drv2667_data *haptics = input_get_drvdata(input);
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int error;
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cancel_work_sync(&haptics->work);
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error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
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DRV2667_STANDBY, 1);
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if (error)
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dev_err(&haptics->client->dev,
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"Failed to enter standby mode: %d\n", error);
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}
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static const struct reg_default drv2667_init_regs[] = {
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{ DRV2667_CTRL_2, 0 },
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{ DRV2667_CTRL_1, DRV2667_25_VPP_GAIN },
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{ DRV2667_WV_SEQ_0, 1 },
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{ DRV2667_WV_SEQ_1, 0 }
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};
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static const struct reg_default drv2667_page1_init[] = {
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{ DRV2667_RAM_HDR_SZ, 0x05 },
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{ DRV2667_RAM_START_HI, 0x80 },
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{ DRV2667_RAM_START_LO, 0x06 },
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{ DRV2667_RAM_STOP_HI, 0x00 },
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{ DRV2667_RAM_STOP_LO, 0x09 },
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{ DRV2667_RAM_REPEAT_CT, 0 },
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{ DRV2667_RAM_DURATION, 0x05 },
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{ DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV },
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{ DRV2667_RAM_AMP, 0x60 },
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};
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static int drv2667_init(struct drv2667_data *haptics)
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{
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int error;
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/* Set default haptic frequency to 195Hz on Page 1*/
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haptics->frequency = 195;
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haptics->page = DRV2667_PAGE_1;
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error = regmap_register_patch(haptics->regmap,
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drv2667_init_regs,
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ARRAY_SIZE(drv2667_init_regs));
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to write init registers: %d\n",
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error);
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return error;
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}
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error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page);
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if (error) {
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dev_err(&haptics->client->dev, "Failed to set page: %d\n",
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error);
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goto error_out;
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}
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error = drv2667_set_waveform_freq(haptics);
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if (error)
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goto error_page;
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error = regmap_register_patch(haptics->regmap,
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drv2667_page1_init,
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ARRAY_SIZE(drv2667_page1_init));
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if (error) {
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dev_err(&haptics->client->dev,
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"Failed to write page registers: %d\n",
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error);
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return error;
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}
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error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
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return error;
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error_page:
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regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
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error_out:
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return error;
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}
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static const struct regmap_config drv2667_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = DRV2667_MAX_REG,
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.reg_defaults = drv2667_reg_defs,
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.num_reg_defaults = ARRAY_SIZE(drv2667_reg_defs),
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.cache_type = REGCACHE_NONE,
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};
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static int drv2667_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct drv2667_data *haptics;
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int error;
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haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
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if (!haptics)
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return -ENOMEM;
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haptics->regulator = devm_regulator_get(&client->dev, "vbat");
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if (IS_ERR(haptics->regulator)) {
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error = PTR_ERR(haptics->regulator);
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dev_err(&client->dev,
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"unable to get regulator, error: %d\n", error);
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return error;
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}
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haptics->input_dev = devm_input_allocate_device(&client->dev);
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if (!haptics->input_dev) {
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dev_err(&client->dev, "Failed to allocate input device\n");
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return -ENOMEM;
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}
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haptics->input_dev->name = "drv2667:haptics";
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haptics->input_dev->dev.parent = client->dev.parent;
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haptics->input_dev->close = drv2667_close;
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input_set_drvdata(haptics->input_dev, haptics);
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input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
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error = input_ff_create_memless(haptics->input_dev, NULL,
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drv2667_haptics_play);
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if (error) {
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dev_err(&client->dev, "input_ff_create() failed: %d\n",
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error);
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return error;
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}
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INIT_WORK(&haptics->work, drv2667_worker);
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haptics->client = client;
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i2c_set_clientdata(client, haptics);
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haptics->regmap = devm_regmap_init_i2c(client, &drv2667_regmap_config);
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if (IS_ERR(haptics->regmap)) {
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error = PTR_ERR(haptics->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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error);
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return error;
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}
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error = drv2667_init(haptics);
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if (error) {
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dev_err(&client->dev, "Device init failed: %d\n", error);
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return error;
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}
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error = input_register_device(haptics->input_dev);
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if (error) {
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dev_err(&client->dev, "couldn't register input device: %d\n",
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error);
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return error;
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}
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return 0;
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}
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static int __maybe_unused drv2667_suspend(struct device *dev)
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{
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struct drv2667_data *haptics = dev_get_drvdata(dev);
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int ret = 0;
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mutex_lock(&haptics->input_dev->mutex);
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if (haptics->input_dev->users) {
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ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
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DRV2667_STANDBY, 1);
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if (ret) {
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dev_err(dev, "Failed to set standby mode\n");
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regulator_disable(haptics->regulator);
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goto out;
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}
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ret = regulator_disable(haptics->regulator);
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if (ret) {
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dev_err(dev, "Failed to disable regulator\n");
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regmap_update_bits(haptics->regmap,
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DRV2667_CTRL_2,
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DRV2667_STANDBY, 0);
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}
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}
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out:
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mutex_unlock(&haptics->input_dev->mutex);
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return ret;
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}
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static int __maybe_unused drv2667_resume(struct device *dev)
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{
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struct drv2667_data *haptics = dev_get_drvdata(dev);
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int ret = 0;
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mutex_lock(&haptics->input_dev->mutex);
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if (haptics->input_dev->users) {
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ret = regulator_enable(haptics->regulator);
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if (ret) {
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dev_err(dev, "Failed to enable regulator\n");
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goto out;
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}
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ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
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DRV2667_STANDBY, 0);
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if (ret) {
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dev_err(dev, "Failed to unset standby mode\n");
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regulator_disable(haptics->regulator);
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goto out;
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}
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}
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out:
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mutex_unlock(&haptics->input_dev->mutex);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(drv2667_pm_ops, drv2667_suspend, drv2667_resume);
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static const struct i2c_device_id drv2667_id[] = {
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{ "drv2667", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, drv2667_id);
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#ifdef CONFIG_OF
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static const struct of_device_id drv2667_of_match[] = {
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{ .compatible = "ti,drv2667", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, drv2667_of_match);
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#endif
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static struct i2c_driver drv2667_driver = {
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.probe = drv2667_probe,
|
|
.driver = {
|
|
.name = "drv2667-haptics",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(drv2667_of_match),
|
|
.pm = &drv2667_pm_ops,
|
|
},
|
|
.id_table = drv2667_id,
|
|
};
|
|
module_i2c_driver(drv2667_driver);
|
|
|
|
MODULE_ALIAS("platform:drv2667-haptics");
|
|
MODULE_DESCRIPTION("TI DRV2667 haptics driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
|