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![Eddie James](/assets/img/avatar_default.png)
The deprecated i2c probe functionality doesn't work with OF compatible strings, as it only checks for the i2c device id. Switch to the new way of probing and grab the match data to select the chip type. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>
696 lines
17 KiB
C
696 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2007-2008 Extreme Engineering Solutions, Inc.
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*
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* Author: Nate Case <ncase@xes-inc.com>
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*
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* LED driver for various PCA955x I2C LED drivers
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*
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* Supported devices:
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*
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* Device Description 7-bit slave address
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* ------ ----------- -------------------
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* PCA9550 2-bit driver 0x60 .. 0x61
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* PCA9551 8-bit driver 0x60 .. 0x67
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* PCA9552 16-bit driver 0x60 .. 0x67
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* PCA9553/01 4-bit driver 0x62
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* PCA9553/02 4-bit driver 0x63
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*
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* Philips PCA955x LED driver chips follow a register map as shown below:
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*
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* Control Register Description
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* ---------------- -----------
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* 0x0 Input register 0
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* ..
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* NUM_INPUT_REGS - 1 Last Input register X
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*
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* NUM_INPUT_REGS Frequency prescaler 0
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* NUM_INPUT_REGS + 1 PWM register 0
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* NUM_INPUT_REGS + 2 Frequency prescaler 1
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* NUM_INPUT_REGS + 3 PWM register 1
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*
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* NUM_INPUT_REGS + 4 LED selector 0
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* NUM_INPUT_REGS + 4
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* + NUM_LED_REGS - 1 Last LED selector
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*
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* where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
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* bits the chip supports.
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*/
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <dt-bindings/leds/leds-pca955x.h>
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/* LED select registers determine the source that drives LED outputs */
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#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
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#define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */
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#define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */
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#define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */
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#define PCA955X_GPIO_INPUT LED_OFF
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#define PCA955X_GPIO_HIGH LED_OFF
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#define PCA955X_GPIO_LOW LED_FULL
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enum pca955x_type {
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pca9550,
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pca9551,
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pca9552,
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ibm_pca9552,
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pca9553,
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};
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struct pca955x_chipdef {
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int bits;
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u8 slv_addr; /* 7-bit slave address mask */
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int slv_addr_shift; /* Number of bits to ignore */
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};
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static struct pca955x_chipdef pca955x_chipdefs[] = {
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[pca9550] = {
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.bits = 2,
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.slv_addr = /* 110000x */ 0x60,
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.slv_addr_shift = 1,
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},
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[pca9551] = {
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.bits = 8,
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.slv_addr = /* 1100xxx */ 0x60,
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.slv_addr_shift = 3,
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},
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[pca9552] = {
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.bits = 16,
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.slv_addr = /* 1100xxx */ 0x60,
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.slv_addr_shift = 3,
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},
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[ibm_pca9552] = {
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.bits = 16,
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.slv_addr = /* 0110xxx */ 0x30,
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.slv_addr_shift = 3,
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},
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[pca9553] = {
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.bits = 4,
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.slv_addr = /* 110001x */ 0x62,
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.slv_addr_shift = 1,
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},
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};
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static const struct i2c_device_id pca955x_id[] = {
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{ "pca9550", pca9550 },
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{ "pca9551", pca9551 },
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{ "pca9552", pca9552 },
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{ "ibm-pca9552", ibm_pca9552 },
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{ "pca9553", pca9553 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca955x_id);
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struct pca955x {
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struct mutex lock;
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struct pca955x_led *leds;
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struct pca955x_chipdef *chipdef;
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struct i2c_client *client;
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#ifdef CONFIG_LEDS_PCA955X_GPIO
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struct gpio_chip gpio;
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#endif
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};
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struct pca955x_led {
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struct pca955x *pca955x;
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struct led_classdev led_cdev;
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int led_num; /* 0 .. 15 potentially */
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u32 type;
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int default_state;
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struct fwnode_handle *fwnode;
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};
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struct pca955x_platform_data {
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struct pca955x_led *leds;
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int num_leds;
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};
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/* 8 bits per input register */
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static inline int pca95xx_num_input_regs(int bits)
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{
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return (bits + 7) / 8;
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}
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/* 4 bits per LED selector register */
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static inline int pca95xx_num_led_regs(int bits)
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{
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return (bits + 3) / 4;
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}
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/*
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* Return an LED selector register value based on an existing one, with
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* the appropriate 2-bit state value set for the given LED number (0-3).
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*/
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static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
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{
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return (oldval & (~(0x3 << (led_num << 1)))) |
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((state & 0x3) << (led_num << 1));
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}
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/*
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* Write to frequency prescaler register, used to program the
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* period of the PWM output. period = (PSCx + 1) / 38
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*/
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static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
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{
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struct pca955x *pca955x = i2c_get_clientdata(client);
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u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
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int ret;
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ret = i2c_smbus_write_byte_data(client, cmd, val);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
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__func__, n, val, ret);
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return ret;
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}
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/*
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* Write to PWM register, which determines the duty cycle of the
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* output. LED is OFF when the count is less than the value of this
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* register, and ON when it is greater. If PWMx == 0, LED is always OFF.
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*
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* Duty cycle is (256 - PWMx) / 256
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*/
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static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
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{
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struct pca955x *pca955x = i2c_get_clientdata(client);
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u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
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int ret;
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ret = i2c_smbus_write_byte_data(client, cmd, val);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
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__func__, n, val, ret);
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return ret;
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}
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/*
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* Write to LED selector register, which determines the source that
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* drives the LED output.
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*/
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static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
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{
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struct pca955x *pca955x = i2c_get_clientdata(client);
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u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
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int ret;
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ret = i2c_smbus_write_byte_data(client, cmd, val);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
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__func__, n, val, ret);
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return ret;
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}
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/*
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* Read the LED selector register, which determines the source that
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* drives the LED output.
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*/
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static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
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{
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struct pca955x *pca955x = i2c_get_clientdata(client);
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u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
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int ret;
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ret = i2c_smbus_read_byte_data(client, cmd);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
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__func__, n, ret);
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return ret;
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}
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*val = (u8)ret;
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return 0;
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}
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static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
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{
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struct pca955x *pca955x = i2c_get_clientdata(client);
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u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
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int ret;
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ret = i2c_smbus_read_byte_data(client, cmd);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
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__func__, n, ret);
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return ret;
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}
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*val = (u8)ret;
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return 0;
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}
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static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
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{
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struct pca955x_led *pca955x_led = container_of(led_cdev,
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struct pca955x_led,
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led_cdev);
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struct pca955x *pca955x = pca955x_led->pca955x;
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u8 ls, pwm;
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int ret;
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ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
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if (ret)
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return ret;
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ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
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switch (ls) {
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case PCA955X_LS_LED_ON:
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ret = LED_FULL;
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break;
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case PCA955X_LS_LED_OFF:
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ret = LED_OFF;
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break;
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case PCA955X_LS_BLINK0:
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ret = LED_HALF;
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break;
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case PCA955X_LS_BLINK1:
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ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
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if (ret)
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return ret;
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ret = 255 - pwm;
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break;
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}
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return ret;
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}
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static int pca955x_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct pca955x_led *pca955x_led;
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struct pca955x *pca955x;
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u8 ls;
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int chip_ls; /* which LSx to use (0-3 potentially) */
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int ls_led; /* which set of bits within LSx to use (0-3) */
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int ret;
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pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
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pca955x = pca955x_led->pca955x;
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chip_ls = pca955x_led->led_num / 4;
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ls_led = pca955x_led->led_num % 4;
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mutex_lock(&pca955x->lock);
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ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
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if (ret)
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goto out;
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switch (value) {
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case LED_FULL:
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ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
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break;
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case LED_OFF:
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ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
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break;
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case LED_HALF:
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ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
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break;
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default:
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/*
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* Use PWM1 for all other values. This has the unwanted
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* side effect of making all LEDs on the chip share the
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* same brightness level if set to a value other than
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* OFF, HALF, or FULL. But, this is probably better than
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* just turning off for all other values.
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*/
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ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
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if (ret)
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goto out;
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ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
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break;
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}
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ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
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out:
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mutex_unlock(&pca955x->lock);
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return ret;
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}
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#ifdef CONFIG_LEDS_PCA955X_GPIO
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/*
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* Read the INPUT register, which contains the state of LEDs.
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*/
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static int pca955x_read_input(struct i2c_client *client, int n, u8 *val)
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{
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int ret = i2c_smbus_read_byte_data(client, n);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
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__func__, n, ret);
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return ret;
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}
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*val = (u8)ret;
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return 0;
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}
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static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset)
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{
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struct pca955x *pca955x = gpiochip_get_data(gc);
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struct pca955x_led *led = &pca955x->leds[offset];
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if (led->type == PCA955X_TYPE_GPIO)
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return 0;
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return -EBUSY;
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}
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static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset,
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int val)
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{
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struct pca955x *pca955x = gpiochip_get_data(gc);
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struct pca955x_led *led = &pca955x->leds[offset];
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if (val)
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return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH);
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return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW);
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}
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static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset,
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int val)
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{
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pca955x_set_value(gc, offset, val);
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}
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static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset)
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{
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struct pca955x *pca955x = gpiochip_get_data(gc);
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struct pca955x_led *led = &pca955x->leds[offset];
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u8 reg = 0;
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/* There is nothing we can do about errors */
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pca955x_read_input(pca955x->client, led->led_num / 8, ®);
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return !!(reg & (1 << (led->led_num % 8)));
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}
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static int pca955x_gpio_direction_input(struct gpio_chip *gc,
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unsigned int offset)
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{
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struct pca955x *pca955x = gpiochip_get_data(gc);
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struct pca955x_led *led = &pca955x->leds[offset];
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/* To use as input ensure pin is not driven. */
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return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT);
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}
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static int pca955x_gpio_direction_output(struct gpio_chip *gc,
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unsigned int offset, int val)
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{
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return pca955x_set_value(gc, offset, val);
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}
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#endif /* CONFIG_LEDS_PCA955X_GPIO */
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static struct pca955x_platform_data *
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pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
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{
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struct pca955x_platform_data *pdata;
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struct pca955x_led *led;
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struct fwnode_handle *child;
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int count;
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count = device_get_child_node_count(&client->dev);
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if (!count || count > chip->bits)
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return ERR_PTR(-ENODEV);
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pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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pdata->leds = devm_kcalloc(&client->dev,
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chip->bits, sizeof(struct pca955x_led),
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GFP_KERNEL);
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if (!pdata->leds)
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return ERR_PTR(-ENOMEM);
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device_for_each_child_node(&client->dev, child) {
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const char *state;
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u32 reg;
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int res;
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res = fwnode_property_read_u32(child, "reg", ®);
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if ((res != 0) || (reg >= chip->bits))
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continue;
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led = &pdata->leds[reg];
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led->type = PCA955X_TYPE_LED;
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led->fwnode = child;
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fwnode_property_read_u32(child, "type", &led->type);
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if (!fwnode_property_read_string(child, "default-state",
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&state)) {
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if (!strcmp(state, "keep"))
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led->default_state = LEDS_GPIO_DEFSTATE_KEEP;
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else if (!strcmp(state, "on"))
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led->default_state = LEDS_GPIO_DEFSTATE_ON;
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else
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led->default_state = LEDS_GPIO_DEFSTATE_OFF;
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} else {
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led->default_state = LEDS_GPIO_DEFSTATE_OFF;
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}
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}
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pdata->num_leds = chip->bits;
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return pdata;
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}
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static const struct of_device_id of_pca955x_match[] = {
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{ .compatible = "nxp,pca9550", .data = (void *)pca9550 },
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{ .compatible = "nxp,pca9551", .data = (void *)pca9551 },
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{ .compatible = "nxp,pca9552", .data = (void *)pca9552 },
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{ .compatible = "ibm,pca9552", .data = (void *)ibm_pca9552 },
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{ .compatible = "nxp,pca9553", .data = (void *)pca9553 },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_pca955x_match);
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static int pca955x_probe(struct i2c_client *client)
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{
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struct pca955x *pca955x;
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struct pca955x_led *pca955x_led;
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struct pca955x_chipdef *chip;
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struct led_classdev *led;
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struct led_init_data init_data;
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struct i2c_adapter *adapter;
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int i, err;
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struct pca955x_platform_data *pdata;
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int ngpios = 0;
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bool set_default_label = false;
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bool keep_pwm = false;
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char default_label[8];
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enum pca955x_type chip_type;
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const void *md = device_get_match_data(&client->dev);
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if (md) {
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chip_type = (enum pca955x_type)md;
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} else {
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const struct i2c_device_id *id = i2c_match_id(pca955x_id,
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client);
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if (id) {
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chip_type = (enum pca955x_type)id->driver_data;
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} else {
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dev_err(&client->dev, "unknown chip\n");
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return -ENODEV;
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}
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}
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chip = &pca955x_chipdefs[chip_type];
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adapter = client->adapter;
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pdata = dev_get_platdata(&client->dev);
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if (!pdata) {
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pdata = pca955x_get_pdata(client, chip);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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/* Make sure the slave address / chip type combo given is possible */
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if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
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chip->slv_addr) {
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dev_err(&client->dev, "invalid slave address %02x\n",
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client->addr);
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return -ENODEV;
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}
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dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
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"slave address 0x%02x\n", client->name, chip->bits,
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client->addr);
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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if (pdata->num_leds != chip->bits) {
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dev_err(&client->dev,
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"board info claims %d LEDs on a %d-bit chip\n",
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pdata->num_leds, chip->bits);
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return -ENODEV;
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}
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pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
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if (!pca955x)
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return -ENOMEM;
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pca955x->leds = devm_kcalloc(&client->dev, chip->bits,
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sizeof(*pca955x_led), GFP_KERNEL);
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if (!pca955x->leds)
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return -ENOMEM;
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i2c_set_clientdata(client, pca955x);
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mutex_init(&pca955x->lock);
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pca955x->client = client;
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pca955x->chipdef = chip;
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init_data.devname_mandatory = false;
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init_data.devicename = "pca955x";
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for (i = 0; i < chip->bits; i++) {
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pca955x_led = &pca955x->leds[i];
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pca955x_led->led_num = i;
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pca955x_led->pca955x = pca955x;
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pca955x_led->type = pdata->leds[i].type;
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switch (pca955x_led->type) {
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case PCA955X_TYPE_NONE:
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break;
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case PCA955X_TYPE_GPIO:
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ngpios++;
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break;
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case PCA955X_TYPE_LED:
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led = &pca955x_led->led_cdev;
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led->brightness_set_blocking = pca955x_led_set;
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led->brightness_get = pca955x_led_get;
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if (pdata->leds[i].default_state ==
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LEDS_GPIO_DEFSTATE_OFF) {
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err = pca955x_led_set(led, LED_OFF);
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if (err)
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return err;
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} else if (pdata->leds[i].default_state ==
|
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LEDS_GPIO_DEFSTATE_ON) {
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err = pca955x_led_set(led, LED_FULL);
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if (err)
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return err;
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}
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init_data.fwnode = pdata->leds[i].fwnode;
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if (is_of_node(init_data.fwnode)) {
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if (to_of_node(init_data.fwnode)->name[0] ==
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'\0')
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set_default_label = true;
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else
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set_default_label = false;
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} else {
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set_default_label = true;
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}
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if (set_default_label) {
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snprintf(default_label, sizeof(default_label),
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"%d", i);
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init_data.default_label = default_label;
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} else {
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init_data.default_label = NULL;
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}
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err = devm_led_classdev_register_ext(&client->dev, led,
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&init_data);
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if (err)
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return err;
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/*
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* For default-state == "keep", let the core update the
|
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* brightness from the hardware, then check the
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* brightness to see if it's using PWM1. If so, PWM1
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* should not be written below.
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*/
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if (pdata->leds[i].default_state ==
|
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LEDS_GPIO_DEFSTATE_KEEP) {
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if (led->brightness != LED_FULL &&
|
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led->brightness != LED_OFF &&
|
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led->brightness != LED_HALF)
|
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keep_pwm = true;
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}
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}
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}
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/* PWM0 is used for half brightness or 50% duty cycle */
|
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err = pca955x_write_pwm(client, 0, 255 - LED_HALF);
|
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if (err)
|
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return err;
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if (!keep_pwm) {
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/* PWM1 is used for variable brightness, default to OFF */
|
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err = pca955x_write_pwm(client, 1, 0);
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if (err)
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return err;
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}
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/* Set to fast frequency so we do not see flashing */
|
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err = pca955x_write_psc(client, 0, 0);
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if (err)
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return err;
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err = pca955x_write_psc(client, 1, 0);
|
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if (err)
|
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return err;
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|
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#ifdef CONFIG_LEDS_PCA955X_GPIO
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if (ngpios) {
|
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pca955x->gpio.label = "gpio-pca955x";
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pca955x->gpio.direction_input = pca955x_gpio_direction_input;
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pca955x->gpio.direction_output = pca955x_gpio_direction_output;
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pca955x->gpio.set = pca955x_gpio_set_value;
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pca955x->gpio.get = pca955x_gpio_get_value;
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pca955x->gpio.request = pca955x_gpio_request_pin;
|
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pca955x->gpio.can_sleep = 1;
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pca955x->gpio.base = -1;
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pca955x->gpio.ngpio = ngpios;
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pca955x->gpio.parent = &client->dev;
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pca955x->gpio.owner = THIS_MODULE;
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|
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err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
|
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pca955x);
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if (err) {
|
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/* Use data->gpio.dev as a flag for freeing gpiochip */
|
|
pca955x->gpio.parent = NULL;
|
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dev_warn(&client->dev, "could not add gpiochip\n");
|
|
return err;
|
|
}
|
|
dev_info(&client->dev, "gpios %i...%i\n",
|
|
pca955x->gpio.base, pca955x->gpio.base +
|
|
pca955x->gpio.ngpio - 1);
|
|
}
|
|
#endif
|
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|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver pca955x_driver = {
|
|
.driver = {
|
|
.name = "leds-pca955x",
|
|
.of_match_table = of_pca955x_match,
|
|
},
|
|
.probe_new = pca955x_probe,
|
|
.id_table = pca955x_id,
|
|
};
|
|
|
|
module_i2c_driver(pca955x_driver);
|
|
|
|
MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
|
|
MODULE_DESCRIPTION("PCA955x LED driver");
|
|
MODULE_LICENSE("GPL v2");
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