^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * CBUS I2C driver for Nokia Internet Tablets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004-2010 Nokia Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Based on code written by Juha Yrjölä, David Weinehall, Mikko Ylinen and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Felipe Balbi. Converted to I2C driver by Aaro Koskinen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This file is subject to the terms and conditions of the GNU General
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Public License. See the file "COPYING" in the main directory of this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * archive for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * This program is distributed in the hope that it will be useful,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * but WITHOUT ANY WARRANTY; without even the implied warranty of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * GNU General Public License for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Bit counts are derived from Nokia implementation. These should be checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * if other CBUS implementations appear.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define CBUS_ADDR_BITS 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define CBUS_REG_BITS 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct cbus_host {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) spinlock_t lock; /* host lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct gpio_desc *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct gpio_desc *dat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct gpio_desc *sel;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * cbus_send_bit - sends one bit over the bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @host: the host we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @bit: one bit of information to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static void cbus_send_bit(struct cbus_host *host, unsigned bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) gpiod_set_value(host->dat, bit ? 1 : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) gpiod_set_value(host->clk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) gpiod_set_value(host->clk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * cbus_send_data - sends @len amount of data over the bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @host: the host we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * @data: the data to send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @len: size of the transfer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static void cbus_send_data(struct cbus_host *host, unsigned data, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) for (i = len; i > 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) cbus_send_bit(host, data & (1 << (i - 1)));
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * cbus_receive_bit - receives one bit from the bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * @host: the host we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int cbus_receive_bit(struct cbus_host *host)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) gpiod_set_value(host->clk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) ret = gpiod_get_value(host->dat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) gpiod_set_value(host->clk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * cbus_receive_word - receives 16-bit word from the bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * @host: the host we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static int cbus_receive_word(struct cbus_host *host)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) for (i = 16; i > 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int bit = cbus_receive_bit(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (bit < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ret |= 1 << (i - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * cbus_transfer - transfers data over the bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * @host: the host we're using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * @rw: read/write flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * @dev: device address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * @reg: register address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * @data: if @rw == I2C_SBUS_WRITE data to send otherwise 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) unsigned reg, unsigned data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* We don't want interrupts disturbing our transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) spin_lock_irqsave(&host->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* Reset state and start of transfer, SEL stays down during transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) gpiod_set_value(host->sel, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* Set the DAT pin to output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) gpiod_direction_output(host->dat, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* Send the device address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) cbus_send_data(host, dev, CBUS_ADDR_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* Send the rw flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) cbus_send_bit(host, rw == I2C_SMBUS_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* Send the register address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) cbus_send_data(host, reg, CBUS_REG_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (rw == I2C_SMBUS_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) cbus_send_data(host, data, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = gpiod_direction_input(host->dat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) dev_dbg(host->dev, "failed setting direction\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) gpiod_set_value(host->clk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) ret = cbus_receive_word(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) dev_dbg(host->dev, "failed receiving data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* Indicate end of transfer, SEL goes up until next transfer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) gpiod_set_value(host->sel, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) gpiod_set_value(host->clk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) gpiod_set_value(host->clk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) spin_unlock_irqrestore(&host->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int cbus_i2c_smbus_xfer(struct i2c_adapter *adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) u16 addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) unsigned short flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) char read_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) u8 command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) union i2c_smbus_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct cbus_host *chost = i2c_get_adapdata(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (size != I2C_SMBUS_WORD_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ret = cbus_transfer(chost, read_write == I2C_SMBUS_READ, addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) command, data->word);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (read_write == I2C_SMBUS_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) data->word = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static u32 cbus_i2c_func(struct i2c_adapter *adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA;
^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 const struct i2c_algorithm cbus_i2c_algo = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) .smbus_xfer = cbus_i2c_smbus_xfer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .smbus_xfer_atomic = cbus_i2c_smbus_xfer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) .functionality = cbus_i2c_func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int cbus_i2c_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct i2c_adapter *adapter = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) i2c_del_adapter(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int cbus_i2c_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct i2c_adapter *adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) struct cbus_host *chost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) chost = devm_kzalloc(&pdev->dev, sizeof(*chost), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (!chost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (gpiod_count(&pdev->dev, NULL) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) chost->clk = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (IS_ERR(chost->clk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return PTR_ERR(chost->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) chost->dat = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (IS_ERR(chost->dat))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return PTR_ERR(chost->dat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) chost->sel = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (IS_ERR(chost->sel))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return PTR_ERR(chost->sel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) gpiod_set_consumer_name(chost->clk, "CBUS clk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) gpiod_set_consumer_name(chost->dat, "CBUS dat");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) gpiod_set_consumer_name(chost->sel, "CBUS sel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) adapter->owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) adapter->class = I2C_CLASS_HWMON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) adapter->dev.parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) adapter->dev.of_node = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) adapter->nr = pdev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) adapter->timeout = HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) adapter->algo = &cbus_i2c_algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) strlcpy(adapter->name, "CBUS I2C adapter", sizeof(adapter->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) spin_lock_init(&chost->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) chost->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) i2c_set_adapdata(adapter, chost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) platform_set_drvdata(pdev, adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return i2c_add_numbered_adapter(adapter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) #if defined(CONFIG_OF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static const struct of_device_id i2c_cbus_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) { .compatible = "i2c-cbus-gpio", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) MODULE_DEVICE_TABLE(of, i2c_cbus_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static struct platform_driver cbus_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) .probe = cbus_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) .remove = cbus_i2c_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .name = "i2c-cbus-gpio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .of_match_table = of_match_ptr(i2c_cbus_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) module_platform_driver(cbus_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) MODULE_ALIAS("platform:i2c-cbus-gpio");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) MODULE_DESCRIPTION("CBUS I2C driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) MODULE_AUTHOR("Juha Yrjölä");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) MODULE_AUTHOR("David Weinehall");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) MODULE_AUTHOR("Mikko Ylinen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) MODULE_AUTHOR("Felipe Balbi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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