^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2011-2016 Synaptics Incorporated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2011 Unixphere
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/rmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "rmi_driver.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define BUFFER_SIZE_INCREMENT 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * struct rmi_i2c_xport - stores information for i2c communication
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * @xport: The transport interface structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * @page_mutex: Locks current page to avoid changing pages in unexpected ways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * @page: Keeps track of the current virtual page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @tx_buf: Buffer used for transmitting data to the sensor over i2c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * @tx_buf_size: Size of the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct rmi_i2c_xport {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct rmi_transport_dev xport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct mutex page_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u8 *tx_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) size_t tx_buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct regulator_bulk_data supplies[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u32 startup_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define RMI_PAGE_SELECT_REGISTER 0xff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define RMI_I2C_PAGE(addr) (((addr) >> 8) & 0xff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * rmi_set_page - Set RMI page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @xport: The pointer to the rmi_transport_dev struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @page: The new page address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * RMI devices have 16-bit addressing, but some of the transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * implementations (like SMBus) only have 8-bit addressing. So RMI implements
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * a page address at 0xff of every page so we can reliable page addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * every 256 registers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * The page_mutex lock must be held when this function is entered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Returns zero on success, non-zero on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int rmi_set_page(struct rmi_i2c_xport *rmi_i2c, u8 page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct i2c_client *client = rmi_i2c->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) u8 txbuf[2] = {RMI_PAGE_SELECT_REGISTER, page};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) retval = i2c_master_send(client, txbuf, sizeof(txbuf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (retval != sizeof(txbuf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) "%s: set page failed: %d.", __func__, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return (retval < 0) ? retval : -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) rmi_i2c->page = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int rmi_i2c_write_block(struct rmi_transport_dev *xport, u16 addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) const void *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct rmi_i2c_xport *rmi_i2c =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) container_of(xport, struct rmi_i2c_xport, xport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct i2c_client *client = rmi_i2c->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) size_t tx_size = len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mutex_lock(&rmi_i2c->page_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!rmi_i2c->tx_buf || rmi_i2c->tx_buf_size < tx_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (rmi_i2c->tx_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) devm_kfree(&client->dev, rmi_i2c->tx_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) rmi_i2c->tx_buf_size = tx_size + BUFFER_SIZE_INCREMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) rmi_i2c->tx_buf = devm_kzalloc(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) rmi_i2c->tx_buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (!rmi_i2c->tx_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) rmi_i2c->tx_buf_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) rmi_i2c->tx_buf[0] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) memcpy(rmi_i2c->tx_buf + 1, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) retval = i2c_master_send(client, rmi_i2c->tx_buf, tx_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (retval == tx_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) else if (retval >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) retval = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) "write %zd bytes at %#06x: %d (%*ph)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) len, addr, retval, (int)len, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) mutex_unlock(&rmi_i2c->page_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int rmi_i2c_read_block(struct rmi_transport_dev *xport, u16 addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) void *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct rmi_i2c_xport *rmi_i2c =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) container_of(xport, struct rmi_i2c_xport, xport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct i2c_client *client = rmi_i2c->client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) u8 addr_offset = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct i2c_msg msgs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .addr = client->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .len = sizeof(addr_offset),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .buf = &addr_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .addr = client->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .flags = I2C_M_RD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .len = len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .buf = buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mutex_lock(&rmi_i2c->page_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (RMI_I2C_PAGE(addr) != rmi_i2c->page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) retval = rmi_set_page(rmi_i2c, RMI_I2C_PAGE(addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (retval == ARRAY_SIZE(msgs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) retval = 0; /* success */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) else if (retval >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) retval = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) rmi_dbg(RMI_DEBUG_XPORT, &client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) "read %zd bytes at %#06x: %d (%*ph)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) len, addr, retval, (int)len, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) mutex_unlock(&rmi_i2c->page_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static const struct rmi_transport_ops rmi_i2c_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .write_block = rmi_i2c_write_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .read_block = rmi_i2c_read_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static const struct of_device_id rmi_i2c_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) { .compatible = "syna,rmi4-i2c" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) MODULE_DEVICE_TABLE(of, rmi_i2c_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static void rmi_i2c_regulator_bulk_disable(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct rmi_i2c_xport *rmi_i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static void rmi_i2c_unregister_transport(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct rmi_i2c_xport *rmi_i2c = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) rmi_unregister_transport_device(&rmi_i2c->xport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static int rmi_i2c_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) struct rmi_device_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct rmi_device_platform_data *client_pdata =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) dev_get_platdata(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) struct rmi_i2c_xport *rmi_i2c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) rmi_i2c = devm_kzalloc(&client->dev, sizeof(struct rmi_i2c_xport),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (!rmi_i2c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) pdata = &rmi_i2c->xport.pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (!client->dev.of_node && client_pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) *pdata = *client_pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) pdata->irq = client->irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Probing %s.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) dev_name(&client->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) "adapter does not support required functionality\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) rmi_i2c->supplies[0].supply = "vdd";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) rmi_i2c->supplies[1].supply = "vio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) error = devm_regulator_bulk_get(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) error = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) error = devm_add_action_or_reset(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) rmi_i2c_regulator_bulk_disable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) rmi_i2c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) of_property_read_u32(client->dev.of_node, "syna,startup-delay-ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) &rmi_i2c->startup_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) msleep(rmi_i2c->startup_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) rmi_i2c->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) mutex_init(&rmi_i2c->page_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) rmi_i2c->xport.dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) rmi_i2c->xport.proto_name = "i2c";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) rmi_i2c->xport.ops = &rmi_i2c_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) i2c_set_clientdata(client, rmi_i2c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * Setting the page to zero will (a) make sure the PSR is in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * known state, and (b) make sure we can talk to the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) error = rmi_set_page(rmi_i2c, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) dev_err(&client->dev, "Failed to set page select to 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) dev_info(&client->dev, "registering I2C-connected sensor\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) error = rmi_register_transport_device(&rmi_i2c->xport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) dev_err(&client->dev, "failed to register sensor: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) error = devm_add_action_or_reset(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) rmi_i2c_unregister_transport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) rmi_i2c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static int rmi_i2c_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) dev_warn(dev, "Failed to resume device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int rmi_i2c_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) msleep(rmi_i2c->startup_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) dev_warn(dev, "Failed to resume device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) #ifdef CONFIG_PM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static int rmi_i2c_runtime_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) ret = rmi_driver_suspend(rmi_i2c->xport.rmi_dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) dev_warn(dev, "Failed to resume device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static int rmi_i2c_runtime_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct i2c_client *client = to_i2c_client(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) rmi_i2c->supplies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) msleep(rmi_i2c->startup_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) dev_warn(dev, "Failed to resume device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static const struct dev_pm_ops rmi_i2c_pm = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) SET_SYSTEM_SLEEP_PM_OPS(rmi_i2c_suspend, rmi_i2c_resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) SET_RUNTIME_PM_OPS(rmi_i2c_runtime_suspend, rmi_i2c_runtime_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) static const struct i2c_device_id rmi_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) { "rmi4_i2c", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) MODULE_DEVICE_TABLE(i2c, rmi_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static struct i2c_driver rmi_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) .name = "rmi4_i2c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) .pm = &rmi_i2c_pm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) .of_match_table = of_match_ptr(rmi_i2c_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) .id_table = rmi_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) .probe = rmi_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) module_i2c_driver(rmi_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) MODULE_DESCRIPTION("RMI I2C driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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